Technical field
[0001]
　The present invention relates to an exhaust gas treatment device and an exhaust gas treatment method, for example, an exhaust gas treatment device and an exhaust gas treatment method for treating combustion exhaust gas discharged from a power generation facility or the like.
Background technology
[0002]
　Conventionally, an exhaust gas treatment apparatus has been proposed that includes a plurality of exhaust gas flow paths including an exhaust heat recovery boiler that is connected to a plurality of gas turbines and recovers exhaust heat of combustion exhaust gas discharged from the gas turbine (for example, See Patent Document 1). In this exhaust gas treatment device, the exhaust heat of the combustion exhaust gas discharged from each gas turbine is recovered by the exhaust heat recovery boiler provided in each exhaust gas flow path. Then, the combustion exhaust gas of each exhaust gas flow path in which the exhaust heat is recovered is integrated into an integrated combustion exhaust gas, and then carbon dioxide (CO 2 ) in the integrated combustion exhaust gas is converted into a CO 2 absorbing liquid by the CO 2 recovery device. Be recovered by.
Prior art documents
Patent literature
[0003]
Patent Document 1: Japanese Patent No. 5291449
Summary of the invention
Problems to be Solved by the Invention
[0004]
　By the way, in the exhaust gas treatment device, a component derived from nitrogen oxides (for example, nitrogen dioxide (NO 2 )) contained in the combustion exhaust gas is accumulated as a storage component in the CO 2 absorbing liquid, so that it is provided in the front stage of the carbon dioxide recovery device. It is desirable to provide a nitrogen oxide removing device that removes nitrogen oxides in the exhaust gas. In this nitrogen oxide removing device, when the exhaust gas becomes lower than a predetermined temperature (for example, less than 300° C.), the nitrogen oxide removing efficiency decreases. Therefore, in order to remove nitrogen oxide efficiently, the exhaust heat recovery device It is necessary to provide it in the previous stage. However, in an exhaust gas treatment device equipped with a plurality of exhaust gas passages connected to a plurality of gas turbines, it is necessary to provide a nitrogen oxide removal device before each exhaust heat recovery boiler in each exhaust gas passage. The device may become large and the equipment cost may increase.
[0005]
　It is an object of the present invention to provide an exhaust gas treatment device and an exhaust gas treatment method that can reduce the amount of nitrogen oxide-derived components accumulated in a CO 2 absorbing liquid and that can reduce an increase in equipment cost.
Means for solving the problems
[0006]
　The exhaust gas treating apparatus of the present invention is provided with a first exhaust gas flow path through which a first combustion exhaust gas discharged from a power generation facility flows, and exhaust heat for recovering exhaust heat of the first combustion exhaust gas. The first combustion exhaust gas that is provided so as to branch from the first exhaust gas passage between the recovery unit and the preceding stage and the subsequent stage of the exhaust heat recovery unit in the first exhaust gas passage, and that flows through the first exhaust gas passage. A second exhaust gas flow path in which at least a part of the first exhaust gas flow path branches and flows as a second combustion exhaust gas, the first combustion exhaust gas flows in the first exhaust gas flow path in which exhaust heat is recovered in the exhaust heat recovery unit, and 2 A nitrogen oxide removing unit for removing nitrogen oxides in the integrated combustion exhaust gas, which is integrated with the second combustion exhaust gas having a temperature relatively higher than that of the first combustion exhaust gas flowing through the exhaust gas flow path, and the nitrogen oxide removal an integrated heat recovery unit for recovering exhaust heat of the integrated combustion exhaust gas to remove said nitrogen oxides in part, CO of the integrated combustion flue gas waste heat is recovered in the integrated heat recovery unit 2 to CO 2 And a CO 2 recovery unit for recovering with a recovery liquid .
[0007]
　According to this configuration, after the combustion exhaust gas discharged from the power generation facility is branched into the first exhaust gas flow passage and the second exhaust gas flow passage, the exhaust heat recovery unit discharges the first combustion exhaust gas flowing through the first exhaust gas flow passage. While recovering heat, the second combustion exhaust gas flowing through the second exhaust gas passage is integrated with the first combustion exhaust gas in a state in which the temperature is relatively higher than that of the first combustion exhaust gas whose exhaust heat is recovered in the exhaust heat recovery unit. And become integrated combustion exhaust gas. As a result, the temperature of the integrated combustion exhaust gas introduced into the nitrogen oxide removal unit can be adjusted to a range suitable for the decomposition and removal of nitrogen oxides, so that the nitrogen oxides in the combustion exhaust gas discharged from the power generation equipment can be efficiently removed. it can. Further, since the temperature of the integrated combustion exhaust gas can be adjusted to a range suitable for decomposing and removing nitrogen oxides only by providing the second exhaust gas passage, it is possible to reduce an increase in equipment cost. Therefore, it is possible to realize an exhaust gas treatment device capable of efficiently removing nitrogen oxides and reducing an increase in equipment cost.
[0008]
　In the exhaust gas treating apparatus of the present invention, the flow rate of the first combustion exhaust gas flowing through the first exhaust gas flow path and the flow rate of the second combustion exhaust gas flowing through the second exhaust gas flow path are adjusted to remove the nitrogen oxides. It is preferable to include a control unit that controls the temperature of the integrated combustion exhaust gas introduced into the unit to 300° C. or higher and 400° C. or lower. With this configuration, since the gas temperature of the integrated combustion exhaust gas introduced into the nitrogen oxide removing portion can below 400 ° C. 300 ° C. or higher which is suitable for decomposition treatment of the nitrogen oxides, CO 2 CO in the recovery unit 2 of the recovered solution It is possible to efficiently reduce the amount of nitrogen oxide-derived components accumulated.
[0009]
　The exhaust gas treatment apparatus of the present invention includes a first exhaust gas passage through which a first combustion exhaust gas discharged from a first power generation facility flows, and a second exhaust gas passage through which a second combustion exhaust gas discharged from a second power generation facility flows, An exhaust heat recovery unit that is provided in the first exhaust gas flow path and recovers exhaust heat of the first combustion exhaust gas; and the first exhaust gas flow path in which exhaust heat is recovered by the exhaust heat recovery unit A nitrogen oxide removing unit for removing nitrogen oxides in the integrated combustion exhaust gas, which integrates the combustion exhaust gas and the second combustion exhaust gas having a temperature relatively higher than that of the first combustion exhaust gas flowing through the second exhaust gas flow path; An integrated exhaust heat recovery unit that recovers exhaust heat of the integrated combustion exhaust gas from which the nitrogen oxides have been removed by the nitrogen oxide removal unit, and the integrated combustion exhaust gas whose exhaust heat has been recovered by the integrated exhaust heat recovery unit And a CO 2 recovery unit for recovering the CO 2 with a CO 2 recovery solution .
[0010]
　According to this configuration, the exhaust heat recovery unit recovers the exhaust heat of the first combustion exhaust gas discharged from the first power generation facility, while the second combustion exhaust gas flowing through the second exhaust gas flow path is exhausted by the exhaust heat recovery unit. The integrated flue gas is integrated with the first flue gas in a state where the temperature is relatively higher than that of the recovered first flue gas. As a result, the temperature of the integrated combustion exhaust gas introduced into the nitrogen oxide removal unit can be adjusted to a range suitable for the decomposition and removal of nitrogen oxides, so that the nitrogen oxides in the combustion exhaust gas discharged from the power generation equipment can be efficiently removed. it can. Moreover, since nitrogen oxides in the integrated combustion exhaust gas can be efficiently removed without providing an exhaust heat recovery unit in the second exhaust gas flow path, an increase in equipment cost can be reduced. Therefore, it is possible to realize an exhaust gas treatment device capable of efficiently removing nitrogen oxides and reducing an increase in equipment cost.
[0011]
　In the exhaust gas treating apparatus of the present invention, the flow rate of the combustion exhaust gas flowing through the first exhaust gas passage and the second exhaust gas passage is adjusted respectively, and the temperature of the integrated combustion exhaust gas introduced into the nitrogen oxide removing unit is adjusted. It is preferable to include a control unit for controlling the temperature to be 300° C. or higher and 400° C. or lower. With this configuration, since the gas temperature of the integrated combustion exhaust gas introduced into the nitrogen oxide removing portion can below 400 ° C. 300 ° C. or higher which is suitable for decomposition treatment of the nitrogen oxides, CO 2 CO in the recovery unit 2 of the recovered solution It is possible to efficiently reduce the amount of nitrogen oxide-derived components accumulated.
[0012]
　In the exhaust gas treating apparatus of the present invention, it is preferable that the nitrogen oxide removing section is provided in the integrated exhaust heat recovery section. With this configuration, the integrated exhaust heat recovery unit and the nitrogen oxide removal unit can be integrated, so that the equipment of the exhaust gas treatment device can be downsized and simplified.
[0013]
　In the exhaust gas treating apparatus of the present invention, it is preferable that the nitrogen oxide removing unit includes a nitrogen oxide removing catalyst that removes the nitrogen oxide and a reducing agent injection unit that injects a reducing agent. With this configuration, it becomes possible to more efficiently decompose and remove the nitrogen oxides contained in the integrated combustion gas by the reducing agent and the nitrogen oxide removal catalyst.
[0014]
　The exhaust gas treating apparatus of the present invention includes a control unit that controls the supply amount of the reducing agent based on the gas flow rate and the nitrogen oxide concentration of the integrated combustion exhaust gas introduced into the CO 2 recovery unit. preferable. With this configuration, it is possible to easily control the nitrogen oxides in the integrated combustion exhaust gas introduced into the CO 2 recovery unit within a desired concentration range.
[0015]
　In the exhaust gas treating apparatus of the present invention, the integrated exhaust heat recovery unit compresses CO 2 exhausted from the CO 2 recovery unit by exhaust heat of the integrated combustion exhaust gas from which the nitrogen oxides have been removed, a CO 2 compression unit. It is preferable to generate driving steam and supply the generated CO 2 compression unit driving steam to the CO 2 compression unit. With this configuration, the exhaust heat of the integrated combustion exhaust gas can be effectively used as steam for driving the CO 2 compression unit, and the operating cost of the exhaust gas processing device can be reduced.
[0016]
　In the exhaust gas treatment apparatus of the present invention, the integrated exhaust heat recovery unit generates turbine driving steam by exhaust heat of the integrated combustion exhaust gas from which the nitrogen oxides have been removed, and the generated turbine driving steam to a steam turbine. It is preferable to supply. With this configuration, the exhaust heat of the integrated combustion exhaust gas can be effectively used as the steam for driving the turbine, and the operating cost of the exhaust gas treatment device can be reduced.
[0017]
　In the exhaust gas treatment apparatus of the present invention, a heating unit that heats the integrated combustion exhaust gas is provided in the preceding stage of the nitrogen oxide removal unit, and the integrated exhaust heat recovery unit is the integrated combustion exhaust gas heated by the heating unit. It is preferable that the turbine driving steam is generated by the exhaust heat of 1 and the generated turbine driving steam is supplied to the steam turbine. With this configuration, the exhaust heat of the integrated combustion exhaust gas can be effectively used as the steam for driving the turbine, and the operating cost of the exhaust gas treatment device can be reduced. Further, it becomes possible to adjust the temperature of the integrated combustion exhaust gas introduced into the integrated exhaust heat recovery section in the heating section to a desired temperature range.
[0018]
　In the exhaust gas treatment apparatus of the present invention, the control unit measures the temperature and gas flow rate of the integrated combustion exhaust gas introduced into the nitrogen oxide removal unit, and based on the measured temperature and gas flow rate, the power generation facility. It is preferable to control at least one of the amount of fuel supplied to the combustor and the amount of steam supplied to the steam turbine. With this configuration, it is possible to control the temperature and the flow rate of the integrated combustion exhaust gas introduced into the nitrogen oxide removing unit within a desired range.
[0019]
　In the exhaust gas treatment apparatus of the present invention, it is preferable that the power generation facility includes an existing power generation facility. With this configuration, the temperature of the integrated combustion exhaust gas can be adjusted to a range suitable for the decomposition and removal of nitrogen oxides by providing the first gas passage and the second gas passage even for the existing power generation equipment. It is also possible to reduce the cost increase.
[0020]
　The exhaust gas treatment method of the present invention includes a first combustion exhaust gas discharged from a power generator and having exhaust heat recovered in an exhaust heat recovery unit provided in a first exhaust gas flow path, and the exhaust heat in the first exhaust gas flow path. A second relatively higher temperature than the first combustion exhaust gas in which exhaust heat is recovered in the exhaust heat recovery unit that has flowed through a second exhaust gas flow path provided between the front stage and the rear stage of the recovery unit. A nitrogen oxide removal step of removing nitrogen oxides in the integrated combustion exhaust gas integrated with the combustion exhaust gas; an integrated exhaust heat recovery step of recovering exhaust heat of the integrated combustion exhaust gas from which the nitrogen oxides have been removed; exhaust heat in the integrated heat recovery process is CO in the integrated flue gas recovered 2 a CO 2 CO is recovered by the recovery liquid 2 , characterized in that it comprises a recovery step.
[0021]
　According to this method, the exhaust heat of the first combustion exhaust gas flowing through the first exhaust gas flow path is recovered by the exhaust heat recovery unit, while the second combustion exhaust gas flowing through the second exhaust gas flow path is recovered by the exhaust heat recovery unit. Becomes a combined combustion exhaust gas integrated with the first combustion exhaust gas in a state where the temperature is relatively higher than the recovered first combustion exhaust gas. As a result, the temperature of the integrated combustion exhaust gas can be adjusted to a range suitable for decomposing and removing nitrogen oxides, so that nitrogen oxides in the combustion exhaust gas discharged from the power generation facility can be efficiently removed. Further, since nitrogen oxides in the combustion exhaust gas discharged from the power generation equipment can be efficiently removed without providing a nitrogen oxide removal portion in the second exhaust gas passage, it is possible to reduce an increase in equipment cost. Therefore, it is possible to realize an exhaust gas treatment device capable of efficiently removing nitrogen oxides and reducing an increase in equipment cost.
[0022]
　The exhaust gas treatment method according to the present invention includes the first combustion exhaust gas discharged from the first power generation device and having exhaust heat recovered in the exhaust heat recovery section provided in the first exhaust gas flow path, and the first combustion exhaust gas discharged from the second power generation device. The nitrogen oxide in the integrated combustion exhaust gas, which is integrated with the second combustion exhaust gas having a temperature relatively higher than that of the first combustion exhaust gas whose exhaust heat is recovered in the exhaust heat recovery unit that has flowed through the second exhaust gas flow path, A nitrogen oxide removing step for removing and integrating the combustion exhaust gas flowing through a plurality of exhaust gas flow paths in which exhaust combustion exhaust gas flows and at least one exhaust heat recovery unit for recovering exhaust heat of the combustion exhaust gas is provided. A nitrogen oxide removal step of removing the nitrogen oxides in the integrated combustion exhaust gas, an integrated exhaust heat recovery step of recovering exhaust heat of the integrated combustion exhaust gas from which the nitrogen oxides have been removed, and the integrated exhaust heat recovery step exhaust heat CO in the integrated flue gas recovered in 2 the CO 2 CO is recovered by the recovery liquid 2 , characterized in that it comprises a recovery step.
[0023]
　According to this method, the exhaust heat recovery unit recovers the exhaust heat of the first combustion exhaust gas discharged from the first power generation facility, while the second combustion exhaust gas flowing through the second exhaust gas flow path is exhausted by the exhaust heat recovery unit. The integrated combustion exhaust gas is integrated with the first combustion exhaust gas in a state where the temperature is relatively higher than that of the recovered first combustion exhaust gas. As a result, the temperature of the integrated combustion exhaust gas can be adjusted to a range suitable for decomposing and removing nitrogen oxides, so that nitrogen oxides in the combustion exhaust gas discharged from the power generation facility can be efficiently removed. Moreover, since nitrogen oxides in the integrated combustion exhaust gas can be efficiently removed without providing an exhaust heat recovery unit in the second exhaust gas flow path, an increase in equipment cost can be reduced. Therefore, it is possible to realize an exhaust gas treatment device capable of efficiently removing nitrogen oxides and reducing an increase in equipment cost.
Effect of the invention
[0024]
　According to the present invention, it is possible to realize an exhaust gas treatment device and an exhaust gas treatment method that can reduce the amount of nitrogen oxide-derived components accumulated in a CO 2 absorbing liquid and that can reduce an increase in equipment cost.
Brief description of the drawings
[0025]
FIG. 1 is a schematic diagram showing an example of an exhaust gas treating apparatus according to a first embodiment.
FIG. 2 is a schematic diagram of a power generation facility according to the first embodiment.
FIG. 3 is a schematic diagram showing another example of the exhaust gas treating apparatus according to the first embodiment.
FIG. 4 is a schematic diagram showing another example of the exhaust gas treating apparatus according to the first embodiment.
FIG. 5 is a schematic diagram showing an example of an exhaust gas treatment apparatus according to a second embodiment.
FIG. 6 is a schematic diagram showing another example of the exhaust gas treating apparatus according to the second embodiment.
FIG. 7 is a diagram showing the amount of nitrogen oxide-derived components accumulated in the CO 2 absorbent of the exhaust gas treating apparatuses according to the example and the comparative example .
MODE FOR CARRYING OUT THE INVENTION
[0026]
　In the conventional exhaust gas treating apparatus, the present inventors have set the temperature of the combustion exhaust gas introduced into the nitrogen oxide removing section to a high temperature (for example, 300° C. or higher) in order to efficiently remove the nitrogen oxides in the combustion exhaust gas. It was necessary to keep the temperature at 400° C. or lower), while paying attention to the fact that the equipment cost would increase if the nitrogen oxide removing parts were respectively provided in the preceding stages of the exhaust heat recovery parts of the plurality of exhaust gas passages. Then, the present inventors have higher temperature of the combustion exhaust gas discharged from the power generation equipment than the first combustion exhaust gas whose exhaust heat is recovered in the exhaust heat recovery section and the first combustion exhaust gas whose exhaust heat is not recovered. It was conceived to introduce the first combustion exhaust gas and the second combustion exhaust gas into the nitrogen oxide removing unit as an integrated combustion exhaust gas after flowing separately to the second combustion exhaust gas. As a result, the inventors of the present invention can make the gas temperature of the integrated combustion exhaust gas a temperature suitable for the decomposition and removal of nitrogen oxides, and the nitrogen oxide-derived component in the CO 2 absorbing liquid in the CO 2 recovery unit can be removed . The inventors have found that the accumulated amount can be reduced and the increase in equipment cost can be reduced, and the present invention has been completed.
[0027]
　Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. The present invention is not limited to each of the following embodiments and can be implemented with appropriate modifications.
[0028]
(First Embodiment)
　FIG. 1 is a schematic diagram showing an example of an exhaust gas treating apparatus 1 according to a first embodiment of the present invention. As shown in FIG. 1, the exhaust gas treatment apparatus 1 according to this embodiment, the combustion exhaust gas G 11 combustion exhaust gas G discharged from the power plant 10 for generating the 11 heat recovery steam 11 and integrated exhaust heat waste heat After being recovered by the recovery boiler 12, CO 2 contained in the integrated combustion exhaust gas G 21 is recovered by the CO 2 recovery unit 13. Exhaust gas treatment apparatus 1, the combustion exhaust gas G 11 and the power generation facility 10 for discharging the flue gas G 11 and heat recovery steam generator 11 disposed downstream of the power plant 10 in the flow direction of, downstream of the heat recovery steam generator 11 The integrated exhaust heat recovery boiler 12 is provided, the CO 2 recovery unit 13 provided at the subsequent stage of the integrated exhaust heat recovery boiler 12, and the CO 2 compression unit 14 provided at the subsequent stage of the CO 2 recovery unit 13 . A chimney 15 for discharging a part of the combustion exhaust gas G 11 is provided between the exhaust heat recovery boiler 11 and the integrated exhaust heat recovery boiler 12 .
[0029]
　FIG. 2 is a schematic diagram of the power generation facility 10 according to the present embodiment. As shown in FIG. 2, the power generation facility 10 is a uniaxial type combined power generation facility (gas turbine combined cycle) in which a gas turbine 210, a steam turbine 220, and a generator 230 are uniaxially configured. The gas turbine 210 includes a compressor 211 that compresses the air A, a combustor 212 that combusts the air A compressed by the compressor 211 with a fuel F, and a turbine 213 that is rotationally driven by the combustion gas generated in the combustor 212. Equipped with. The compressor 211 and the turbine 213 are connected via a turbine shaft 240.
[0030]
　The steam turbine 220 is a medium-pressure/high-pressure steam turbine in which a low-pressure steam turbine 221 that is rotationally driven by low-pressure steam, a medium-pressure steam turbine 222A that is rotationally driven by medium-pressure steam, and a high-pressure steam turbine 222B that is rotationally driven by high-pressure steam are connected. And 222. The low-pressure steam turbine 221 and the medium-pressure/high-pressure steam turbine 222 are connected to the power generator 230 via the turbine shaft 240 and are also connected to the gas turbine 210. The generator 230 generates electric power by rotationally driving the gas turbine 210 and the steam turbine 220 via a turbine shaft 240.
[0031]
　The power generation facility 10 supplies the combustion exhaust gas G 11 generated by power generation to the exhaust heat recovery boiler 11 via the exhaust gas line L 11 . The exhaust gas line L 11 , the exhaust gas line L 11 exhaust gas line L between the front and rear stages of the heat recovery steam generator 11 in 11 branch exhaust gas line L branching from 11B is provided. That is, in the present embodiment, the exhaust gas line L 11 is a main exhaust gas line (first exhaust gas flow path) L 11A and a branch exhaust gas line (second exhaust gas flow path) between the front stage and the rear stage of the exhaust heat recovery boiler 11. It is branched to L 11B .
[0032]
　A flow rate control valve V 11A , an exhaust heat recovery boiler 11, and a chimney 15 are provided in this order in the exhaust gas line L 11 . The flow rate control valve V 11A adjusts the flow rate of the combustion exhaust gas (first combustion exhaust gas) G 11A flowing through the main exhaust gas line L 11A . The exhaust heat recovery boiler 11 recovers the exhaust heat of the combustion exhaust gas G 11A flowing through the main exhaust gas line L 11A , and supplies the exhaust heat recovered combustion exhaust gas G 11A to the chimney 15. The chimney 15 discharges a part of the combustion exhaust gas G 11A to the outside as necessary and supplies the combustion exhaust gas G 11A to the integrated exhaust heat recovery boiler 12. A flow rate control valve V 11B is provided in the branched exhaust gas line L 11B . The flow rate control valve V 11B adjusts the flow rate of the combustion exhaust gas (second combustion exhaust gas) G 11B flowing through the branch exhaust gas line L 11B . Branch exhaust gas line L 11BSupplies a part or all of the combustion exhaust gas G 11 flowing through the exhaust gas line L 11 to the integrated exhaust heat recovery boiler 12 without passing through the exhaust heat recovery boiler 11 and the chimney 15.
[0033]
　Integration heat recovery boiler 12, mainly the exhaust gas line L 11A combustion exhaust gas flowing through the G 11A and the branch exhaust gas line L 11B the combustion exhaust gas G flowing through 11B integrated combustion is integrated exhaust gas G 21 are supplied. Integrated heat recovery boiler 12 is integrated combustion exhaust gas G 21 to recover waste heat. The integrated exhaust heat recovery boiler 12 is provided therein with a nitrogen oxide removing unit 120 for reducing and removing nitrogen oxides such as nitrogen monoxide and nitrogen dioxide contained in the integrated combustion exhaust gas G 21 . As described above, by providing the nitrogen oxide removing unit 120 in the integrated exhaust heat recovery boiler 12, the exhaust gas treatment device 1 can be downsized. The nitrogen oxide removing unit 120 does not necessarily have to be provided integrally with the integrated exhaust heat recovery boiler 12, and may be provided outside the integrated exhaust heat recovery boiler 12.
[0034]
　Nitrogen oxide removing unit 120 integrates the combustion exhaust gas G 21 with a reducing agent supply unit 121 for injecting a reducing agent for reducing nitrogen oxides in, provided at the subsequent stage of the reducing agent supply unit 121, selectively nitrogen oxides And a selective catalytic reduction (SCR) unit 122 filled with a denitration catalyst for reduction. The reducing agent of the reducing agent supply unit 121 is not particularly limited as long as it can decompose and remove nitrogen oxides such as nitric oxide and nitrogen dioxide. The denitration catalyst of the selective catalyst reduction unit 122 is not particularly limited as long as it can decompose and remove nitrogen oxides such as nitric oxide and nitrogen dioxide.
[0035]
　In the integrated exhaust heat recovery boiler 12 , the reducing agent is supplied from the reducing agent supply section 121 into the integrated combustion exhaust gas G 21 in the nitrogen oxide removing section 120, and the nitrogen oxide supplied with the reducing agent is selected by the selective catalyst reducing section 122. Disassemble. The integrated heat recovery boiler 12, nitrogen oxides decomposed processed integrated combustion exhaust gas G 21 recovers waste heat of the integrated combustion exhaust gas G to recover the exhaust heat 21 the CO 2 is supplied to the recovery unit 13.
[0036]
　CO 2 recovery unit 13, integrated combustion exhaust gas G 21 carbon dioxide in the (CO 2 a) CO 2 CO is recovered by an absorption liquid 2 and absorption tower, CO 2 CO absorbed 2 heated to CO absorption liquid 2 absorption And a CO 2 regeneration tower for releasing CO 2 from the liquid . The CO 2 recovery liquid is not particularly limited as long as it can recover carbon dioxide (CO 2 ) in the integrated combustion exhaust gas G 21 , and for example, an amine-based absorption liquid can be used. Further, the CO 2 recovery unit 13 discharges the integrated combustion exhaust gas G 21 that has recovered CO 2 to the outside, and supplies the recovered CO 2 to the CO 2 compression unit 14. CO The 2 compression part 14 compresses and discharges the CO 2 supplied from the CO 2 recovery part 13 .
[0037]
　Further, the exhaust gas treatment device 1 includes a first exhaust gas measurement unit 16 that measures the gas flow rate and temperature of the integrated combustion exhaust gas G 21 that is introduced into the integrated exhaust heat recovery boiler 12, and integrated combustion that is introduced into the CO 2 recovery unit 13. the exhaust gas G 21 and the second exhaust gas measuring unit 17 for measuring the gas flow and concentration of nitrogen oxides, integrated combustion exhaust gas G from the supply amount and the reducing agent supply portion 121 of the fuel F into the power plant 10 21 is supplied during the reduction And a control unit 18 that controls the supply amount of the agent. The control unit 18 uses the gas flow rate and temperature of the integrated combustion exhaust gas G 1 measured by the first exhaust gas measurement unit 16 to open the flow control valves V 11A and V 11B and supply the amount of fuel to the power generation facility 10. Further, the control unit 18 controls the supply amount of the fuel F to the power generation equipment 10 based on the gas flow rate and the nitrogen oxide concentration of the integrated combustion exhaust gas G 1 measured by the second exhaust gas measurement unit 17. To do. The measurement of the gas flow rate and the temperature in the first exhaust gas measurement unit 16 and the measurement of the gas flow rate and the nitrogen oxide concentration in the second exhaust gas measurement unit 17 are performed by conventionally known methods.
[0038]
　The control unit 18 adjusts the openings of the flow rate control valves V 11A and V 11B and the supply amount of the fuel F to the power generation equipment 10, and the temperature of the integrated combustion exhaust gas G 21 measured by the first exhaust gas measurement unit 16 is 300. The temperature is controlled to be not lower than 400°C and not higher than 400°C. By such control, the exhaust gas treatment device 1 sets the temperature of the integrated combustion exhaust gas G 21 supplied to the nitrogen oxides removing unit 120 of the integrated exhaust heat recovery boiler 12 to a temperature suitable for decomposition and removal of nitrogen oxides. Therefore, the nitrogen oxides in the integrated combustion exhaust gas G 21 can be decomposed and removed more efficiently .
[0039]
　Control unit 18, integrated combustion exhaust gas G is measured by the first exhaust gas measuring unit 16 21 when the temperature of lower than 300 ° C., the flow rate control valve V 11A reduced and the flow control valve V of the opening of 11B opening of The ratio of the combustion exhaust gas G 11B flowing through the branched exhaust gas line L 11B in the integrated combustion exhaust gas G 21 is increased with respect to the combustion exhaust gas G 11A flowing through the main exhaust gas line L 11A by controlling at least one of the increase of the above. With this, the ratio of the high temperature combustion exhaust gas G 11B that has not been heat-recovered by the exhaust heat recovery boiler 11 to the combustion exhaust gas G 11A whose temperature has decreased after the heat recovery by the exhaust heat recovery boiler 11 is relatively increased. Therefore, the temperature of the integrated combustion exhaust gas G 21 measured by the first exhaust gas measurement unit 16 increases. Further, the control unit 18 may maintain the openings of the flow rate control valves V 11A and V 11B to increase the supply amount of the fuel F to the power generation facility 10 and raise the temperature of the integrated combustion exhaust gas G 21 .
[0040]
　In addition, when the temperature of the integrated combustion exhaust gas G 21 measured by the first exhaust gas measurement unit 16 exceeds 400° C. , the control unit 18 increases the opening degree of the flow control valve V 11A and controls the flow control valve V 11B . The ratio of the combustion exhaust gas G 11B flowing through the branched exhaust gas line L 11B in the integrated combustion exhaust gas G 21 is reduced with respect to the combustion exhaust gas G 11A flowing through the main exhaust gas line L 11A by controlling at least one of the reduction of the opening degree . With this, the ratio of the high temperature combustion exhaust gas G 11B that has not been heat-recovered by the exhaust heat recovery boiler 11 to the combustion exhaust gas G 11A whose temperature has decreased after the heat recovery by the exhaust heat recovery boiler 11 is relatively reduced. since it is an integrated combustion exhaust gas G is measured by the first exhaust gas measuring unit 16 21 temperature is lowered. Further, the control unit 18 maintains the openings of the flow rate control valves V 11A and V 11B to reduce the supply amount of the fuel F to the power generation equipment 10 to reduce the integrated combustion exhaust gas G 21.The temperature of may be lowered.
[0041]
　The control unit 18 adjusts the supply amount of the reducing agent supplied from the reducing agent supply unit 121, integrated combustion exhaust gas G is measured by the second exhaust gas measuring unit 17 21 NOx concentration in the predetermined value or less Control so that. Control unit 18, integrated combustion exhaust gas G is measured by the second exhaust gas measuring unit 17 21 in the case of nitrogen oxides concentration in is greater than the predetermined value, increase the supply amount of the reducing agent from the reducing agent supply unit 121. The integrated combustion exhaust gas G is measured by the second exhaust gas measuring unit 17 21 in the case of nitrogen oxides concentration in is less than the predetermined value, maintain or reduce the supply amount of the reducing agent from the reducing agent supply unit 121. Such control exhaust gas treatment apparatus 1, CO 2 integrated combustion exhaust gas G is introduced into the recovery section 13 21 Since the concentration of nitrogen oxides in can be controlled to a predetermined value or less, CO 2 is discharged from the recovery unit 13 The nitrogen oxides in the integrated combustion exhaust gas G 21 after CO 2 recovery can be efficiently reduced.
[0042]
　Next, the overall operation of the exhaust gas treatment device 1 according to the present embodiment will be described. The combustion exhaust gas G discharged from the power plant 10 11 is the exhaust gas line L 11 Shuhai gas line L through 11A combustion exhaust gas G flowing through the 11A and branch exhaust gas line L 11B the combustion exhaust gas G flowing through 11B is branched into. The combustion exhaust gas G 11A flowing through the main exhaust gas line L 11A has its temperature reduced due to exhaust heat recovery by the exhaust heat recovery boiler 11, and a part of it is exhausted at the chimney 15, and then branched off at the exhaust gas line L 11. It is integrated with the flue gas G 11B flowing through 11B . Further, the combustion exhaust gas G 11B flowing through the branch exhaust gas line L 11B is integrated with the combustion exhaust gas G 11A flowing through the main exhaust gas line in the exhaust gas line L 11 in a high temperature state without passing through the exhaust heat recovery boiler 11 .
[0043]
　The integrated combustion exhaust gas G 21 in which the combustion exhaust gas G 11A and the combustion exhaust gas G 11B are integrated is supplied to the integrated exhaust heat recovery boiler 12 via the exhaust gas line L 11 . Here, the control unit 18 controls the valve openings of the flow rate control valves V 11A and V 11B and the supply amount of the fuel F supplied to the power generation facility 10 as necessary, so that the temperature of the integrated combustion exhaust gas G 21 is increased. Is controlled to a predetermined temperature (for example, 300° C. or higher and 400° C. or lower). In the integrated combustion exhaust gas G 21 supplied to the integrated exhaust heat recovery boiler 12 , the reducing agent is supplied by the reducing agent supply section 121 of the nitrogen oxide removal section 120, and the nitrogen oxides are decomposed and removed by the selective catalyst reduction section 122. After that, it is supplied to the CO 2 recovery unit 13. Here, the control unit 18 controls the integrated combustion exhaust gas G from the reducing agent supply unit 121 so that the nitrogen oxides in the integrated combustion exhaust gas G 21 supplied to the CO 2 recovery unit 13 will be equal to or less than a predetermined value as necessary. Control the amount of reducing agent fed into 21 . Integrated combustion exhaust gas G supplied to the CO 2 recovery unit 13 After CO 2 is collected by the CO 2 absorbing liquid , 21 is discharged to the outside of the exhaust gas treatment device 1. CO 2 integrated combustion exhaust gas G is collected by the absorption liquid 21 CO in 2 is, CO by heating 2 after being radiated from the absorption solution, CO 2 is discharged is compressed is supplied to the compression unit 14.
[0044]
　As described above, according to the above-described embodiment, the combustion exhaust gas G 11 emitted from the power generation facility 10 is branched into the main exhaust gas line L 11A and the branch exhaust gas line L 11B , and then provided in the main exhaust gas line L 11A . The exhaust heat of the combustion exhaust gas G 11A is recovered by the exhaust heat recovery boiler 11 while the combustion exhaust gas G 11B flowing through the branch exhaust gas line L 11B has a higher temperature than the combustion exhaust gas G 11A and the exhaust gas after exhaust heat recovery is recovered. It is integrated with G 11A to form an integrated combustion exhaust gas G 21 . Thus, integrated combustion exhaust gas G is introduced into the integrated heat recovery boiler 12 21 Since the temperature of can be adjusted to a range suitable for decomposing and removing nitrogen oxides, nitrogen oxides in the combustion exhaust gas discharged from the power generation facility 10 Can be removed efficiently. Further , the integrated combustion exhaust gas G 21 can be provided only by providing the branch exhaust gas line L 11B.Since the temperature can be adjusted to a range suitable for the decomposition and removal of nitrogen oxides, the increase in equipment cost can be reduced. Therefore, it is possible to realize the exhaust gas treatment device 1 capable of efficiently removing nitrogen oxides and reducing the increase in equipment cost.
[0045]
　In addition, in the embodiment described above, the configuration in which the exhaust heat recovery boiler 11 is provided in the main exhaust gas line L 11A has been described, but the exhaust heat recovery boiler 11 may be provided in the branch exhaust gas line L 11B , and the main exhaust gas line L 11B. The exhaust heat recovery boiler 11 may be provided in both the L 11A and the branch exhaust gas line L 11B . When the exhaust heat recovery boiler 11 is provided in both the main exhaust gas line L 11A and the branch exhaust gas line L 11B , the exhaust heat recovery amount of the combustion exhaust gas G 11A in the exhaust heat recovery boiler 11 of the main exhaust gas line L 11A and the branch exhaust gas By making the exhaust heat recovery amount of the combustion exhaust gas G 11B in the exhaust heat recovery boiler 11 of the line L 11B different, the integrated combustion exhaust gas G 21 can be adjusted to a desired temperature. Further, the power generation facility 10 may be an existing power generation facility or a newly installed power generation facility. When the power generation facility 10 is an existing power generation facility, the exhaust gas treatment device 1 according to the above-described embodiment can be configured only by providing the branched exhaust gas line L 11B with respect to the existing exhaust gas line .
[0046]
　Further, the configuration of the integrated exhaust heat recovery boiler 12 in the above-described embodiment can be changed as appropriate. FIG. 3 is a schematic diagram showing another example of the exhaust gas treating apparatus 1 according to the above embodiment. In the exhaust gas treatment apparatus 2 shown in FIG. 3, the integrated exhaust heat recovery boiler 12 includes a steam generation unit 123 provided at a subsequent stage of the nitrogen oxide removal unit 120. Steam generator 123, integrates the combustion exhaust gas G 21 CO and turbine drive steam generator 123A disposed downstream of the nitrogen oxide removal unit 120 in the flow direction, provided downstream of the turbine driving steam generator 123A The second compression unit driving vapor generation unit 123B is provided.
[0047]
　Turbine drive steam generating unit 123A is integrated combustion exhaust gas G nitrogen oxides have been removed 21 turbine drive steam S is a low-pressure steam waste heat is recovered to drive the low-pressure steam turbine 19 1 generates a. In addition, the turbine driving steam generation unit 123A supplies the turbine driving steam S 1 generated via the steam supply line L 12 to the low pressure steam turbine 19. The low-pressure steam turbine 19 may be provided outside the exhaust gas treatment device 2 or may be the low-pressure steam turbine 221 of the power generation facility 10 shown in FIG. The low-pressure steam turbine 19 is rotationally driven by the turbine-driving steam S 1 to generate power by a generator (not shown). As a result, the exhaust gas treatment device 2 can generate electric power by the exhaust heat of the integrated combustion exhaust gas G 21 recovered by the integrated exhaust heat recovery boiler 12, so that the steam required for driving the low pressure steam turbine 19 can be reduced. it can. Further, low-pressure steam turbine 19, steam discharge line L 13 turbine drive steam S after the turbine driven via 1 the CO 2 absorbing solution regeneration steam S 2 CO as 2 supplies the recovery unit 13.
[0048]
　The CO 2 compression unit driving steam generation unit 123B is a low-pressure steam that drives the CO 2 compression unit 14 by recovering exhaust heat of the integrated combustion exhaust gas G 21 from which nitrogen oxides have been removed , and is a CO 2 compression unit driving steam. Generate S 3 . Further, the CO 2 compression unit driving vapor generation unit 123B supplies the CO 2 compression unit driving vapor S 3 generated via the vapor supply line L 14 to the CO 2 compression unit 14. CO 2 compression section 14, CO 2 compression unit driving the steam S 3 by CO 2 by driving the compression unit CO 2 compressing. As a result, the exhaust gas treatment device 2 can compress CO 2 by the exhaust heat of the integrated combustion exhaust gas G 21 recovered by the integrated exhaust heat recovery boiler 12, so that the CO 2The steam required for compression can be reduced. Moreover, CO 2 compression section 14, the vapor discharge line L 15 CO through 2 CO compression section after driving 2 compression unit driving the steam S 3 the CO 2 absorbing solution regeneration steam S 4 CO as 2 to the collecting section 13 Supply.
[0049]
　CO 2 recovery unit 13, CO 2 absorbing solution regeneration steam S 2 , S 4 and CO 2 was supplied to the reboiler of the regenerator, CO 2 the recovered CO 2 CO from the absorption liquid 2 performs dissipation. Thereby, the exhaust gas treatment device 2 can reduce the steam used for the reboiler of the CO 2 absorption tower. The CO 2 recovery unit 13 collects the condensed water W obtained by condensing the steam S 2 and S 4 for regenerating the CO 2 absorbing liquid used in the reboiler of the CO 2 absorption tower, and the turbine driving steam generation unit 123A of the integrated exhaust heat recovery boiler 12. And the CO 2 compression unit driving vapor generation unit 123B.
[0050]
　The control unit 18 supplies the fuel supplied to the combustor 212 of the power generation facility 10 based on the temperature and the gas flow rate of the integrated combustion exhaust gas G 21 introduced into the nitrogen oxide removal unit 120 measured by the first exhaust gas measurement unit 16. The amount of F, the supply amount of the turbine driving steam S 1 supplied to the low pressure steam turbine 19 and the supply amount of the CO 2 compression unit driving steam S 3 supplied to the CO 2 compression unit 14 are controlled. Control unit 18, integrated combustion exhaust gas G is introduced into the nitrogen oxide removing unit 120 21 When the temperature and the gas flow rate is less than the predetermined range, it increases the fuel F supplied to the combustor 212 of the power generation facility 10. In addition, the control unit 18 reduces the fuel F supplied to the combustor 212 of the power generation facility 10 when the temperature and the gas flow rate of the integrated combustion exhaust gas G 21 introduced into the nitrogen oxide removal unit 120 exceed a predetermined range. Let Further, when the temperature and the gas flow rate of the integrated combustion exhaust gas G 21 introduced into the nitrogen oxide removing section 120 are less than the predetermined range , the control section 18 sets the flow rate control valve V 12 provided in the steam supply line L 12 in the range. and steam supply line L 14 flow control valve V provided in the 14Of the turbine driving steam S 1 supplied to the low-pressure steam turbine 19 and at least one of the supply amounts of the CO 2 compression unit driving steam S 3 supplied to the CO 2 compression unit 14 are reduced. Reduce. The control unit 18 integrates the combustion exhaust gas G is introduced into the nitrogen oxide removing unit 120 21 When the temperature and the gas flow rate is greater than the predetermined range, the steam supply line L 12 flow control valve V provided in the 12 And at least one of the flow control valves V 14 provided in the steam supply line L 14 is increased in opening degree, and the turbine driving steam S 1 supplied to the low-pressure steam turbine 19 and the CO 2 supplied to the CO 2 compression unit 14 are supplied. 2 At least one of the supply amounts of the compression unit driving vapor S 3 is increased. With such control, the temperature of the integrated combustion exhaust gas G 21 introduced into the nitrogen oxide removing unit 120 can be controlled within a range suitable for decomposition and removal of nitrogen oxides, and thus the integrated combustion exhaust gas G 21The nitrogen oxides therein can be efficiently reduced.
[0051]
　As described above, according to the exhaust gas treatment device 2 of the above-described embodiment , the low-pressure steam turbine 19 of the integrated exhaust heat recovery boiler 12 is driven by the turbine driving steam generating unit 123A and the CO 2 compression unit driving steam generating unit 123B. should become a turbine driving steam S to the rotary drive 1 , CO 2 CO required for compression of 2 vapor compression unit driving S 3 and CO 2 is required for regeneration of the absorbent CO 2 absorbing solution regeneration steam S 2 , S 4 are obtained, the amount of steam used in the exhaust gas treatment device 2 as a whole can be reduced.
[0052]
　FIG. 4 is a schematic diagram showing another example of the exhaust gas treatment device 2 according to the above embodiment. In the exhaust gas treatment apparatus 3 shown in FIG. 4, the integrated exhaust heat recovery boiler 12 is provided at the introduction part of the integrated combustion exhaust gas G 21 which is the preceding stage of the nitrogen oxides removing part 120 in addition to the steam generating part 123 shown in FIG. The heating unit 124 is provided, and the steam generating unit 125 provided between the heating unit 124 and the nitrogen oxide removing unit 120 is provided. The steam generating unit 125 is provided in the latter stage of the heating unit 124, and is provided with a turbine driving steam generating unit 125A that generates high pressure steam that rotationally drives the high pressure steam turbine 20A of the intermediate pressure/high pressure steam turbine 20, and a turbine driving steam generation. The turbine driving steam generation unit 125B that is provided in the subsequent stage of the unit 125B and that generates the intermediate pressure steam that rotationally drives the intermediate pressure/high pressure steam turbine 20B is provided.
[0053]
　The heating unit 124 heats (for example, 500° C. or more and 600° C. or less) the integrated combustion exhaust gas G 21 introduced into the integrated exhaust heat recovery boiler 12, and the heated integrated combustion exhaust gas G 21 is used for driving the turbine of the steam generation unit 125. It is supplied to the steam generation unit 125A. Integrated combustion exhaust gas G 21 warming can be heated using a conventionally known typical heating apparatus. Note that integrated combustion exhaust gas G is introduced to the integrated heat recovery boiler 12 21 when the temperature of the high, the heating unit 124 is not necessarily provided.
[0054]
　Turbine drive steam generating unit 125A is heated integrated combustion exhaust gas G by the heating unit 124 21 for a turbine driving a high-pressure steam to drive the high-pressure steam turbine 20A of medium pressure and high pressure steam turbine 20 by the exhaust heat recovered in the Generates steam S 5 . Further, the turbine driving steam generating unit 125A, the steam supply line L 16 turbine drive steam S produced through the 5 supplies the high-pressure steam turbine 20A. The medium-pressure/high-pressure steam turbine 20 may be provided outside the exhaust gas treatment device 3, or may be the medium-pressure/high-pressure steam turbine 222 of the power generation facility 10 shown in FIG. 2. High pressure steam turbine 20A is a turbine driving steam S 5 to generate power by the generator (not shown) rotationally driven by. Thus, the exhaust gas processing device 3, integrated heat recovery steam 12 recovered integrated combustion exhaust gas G 21 it is possible to perform the power generation by the exhaust heat of, reduces the steam required to drive the medium pressure and high pressure steam turbine 20 can do. Further, high-pressure steam turbine 20A, the steam discharge line L 17 turbine drive steam S after the turbine driven via 6 for supplying the turbine driving steam generating unit 125A.
[0055]
　Turbine drive steam generating unit 125B is heated integrated combustion exhaust gas G by the heating unit 124 21 is a steam in driving the steam turbine 20B in the medium-pressure and high-pressure steam turbine 20 by the exhaust heat is recovered in the turbine The driving steam S 7 is generated. Further, the turbine driving steam generating unit 125B has a turbine driving steam S produced through the steam supply line L18 7 supplied to the intermediate pressure steam turbine 20B of. The intermediate pressure steam turbine 20B is a turbine driving steam S 7 to generate power by the generator (not shown) rotationally driven by. Thus, the exhaust gas processing device 3, integrated heat recovery steam 12 recovered integrated combustion exhaust gas G 21 it is possible to perform the power generation by the exhaust heat of, reducing the steam required to drive the intermediate pressure steam turbine 20B You can Moreover, the intermediate pressure steam turbine 20B, the steam discharge line L 19 turbine drive steam S after the turbine driven via 8 for supplying turbine drive steam generating unit 125B.
[0056]
　The control unit 18 supplies a turbine to the medium-pressure/high-pressure steam turbine 20 based on the temperature and gas flow rate of the integrated combustion exhaust gas G 21 introduced into the nitrogen oxide removal unit 120 measured by the first exhaust gas measurement unit 16. The supply amount of the driving steams S 5 and S 7 is controlled. Control unit 18, integrated combustion exhaust gas G is introduced into the nitrogen oxide removing unit 120 21 When the temperature and the gas flow rate is less than the predetermined range, the vapor supply line L 16 the flow control valve V provided in the 16 and steam The opening degree of at least one of the flow rate control valves V 18 provided in the supply line L 18 is reduced to reduce at least one of the turbine driving steams S 5 and S 7 supplied to the medium/high pressure steam turbine 20 . The control unit 18 integrates the combustion exhaust gas G is introduced into the nitrogen oxide removing unit 120 21 When the temperature and the gas flow rate is greater than the predetermined range, the vapor supply line L 16 the flow control valve V provided in the 16 And steam supply line L 18By increasing the opening degree of at least one of the flow control valves V 18 provided in the above , at least one of the supply amounts of the turbine driving steams S 5 and S 7 supplied to the intermediate pressure/high pressure steam turbine 20 is increased. By such control, the temperature of the integrated combustion exhaust gas G 21 introduced into the nitrogen oxide removal unit 120 can be controlled to a range suitable for the decomposition and removal of nitrogen oxides, so that the nitrogen oxides in the integrated combustion exhaust gas G 21 are removed. It can be efficiently reduced.
[0057]
　As described above, according to the exhaust gas treatment device 3 of the above-described embodiment, the turbine driving steam generation units 125A and 125B of the integrated exhaust heat recovery boiler 12 are required to drive the intermediate pressure/high pressure steam turbine 20 to rotate. Since the turbine driving steams S 5 and S 7 are obtained, the amount of steam used in the entire exhaust gas treatment device 3 can be reduced.
[0058]
(Second Embodiment)
　Next, a second embodiment of the present invention will be described. In each of the following embodiments, differences from the above-described embodiments will be mainly described, and duplicated description will be avoided. Further, the same reference numerals are given to constituent elements common to the above-described first embodiment. Furthermore, the following respective embodiments can be implemented in appropriate combinations.
[0059]
　FIG. 5: is a schematic diagram which shows an example of the exhaust gas processing apparatus 4 which concerns on the 2nd Embodiment of this invention. As shown in FIG. 5, the exhaust gas treatment device 4 according to the present embodiment collects the exhaust heat of the combustion exhaust gas G 11-1 , G 11-2 discharged from the two power generation facilities 10-1, 10-2, respectively. After being recovered by the integrated exhaust heat recovery boiler 12, the CO 2 contained in the combustion exhaust gas G 11-1 , G 11-2 is recovered by the CO 2 recovery unit 13. Exhaust gas treatment apparatus 4, flue gas (first combustion gas) G 11-1 and power plant (first power plant) 10-1 for discharging the combustion exhaust gas (second combustion gas) G 11-2 for discharging the power generation The equipment (second power generation equipment) 10-2, the exhaust heat recovery boiler 11-1 provided at the latter stage of the power generation equipment 10-1 in the flow direction of the combustion exhaust gas G 11-1 , and the exhaust heat recovery boiler 11-1. integration heat recovery steam 12 disposed downstream, CO disposed downstream of the integrated heat recovery steam 12 2 and the recovery unit 13, CO 2 CO provided after the recovery section 13 2And a compression unit 14. A chimney 15-1 for discharging a part of the combustion exhaust gas G 11-1 is provided between the exhaust heat recovery boiler 11-1 and the integrated exhaust heat recovery boiler 12 .
[0060]
　The power generation facility 10-1 discharges the combustion exhaust gas G 11-1 generated by power generation to the exhaust gas line (first exhaust gas flow path) L 11-1 . The exhaust gas line L 11-1 is provided with an exhaust heat recovery boiler 11-1, a chimney 15-1 and a flow rate control valve V 11-1 in this order. The flow rate control valve V 11-1 adjusts the flow rate of the combustion exhaust gas G 11-1 flowing through the exhaust gas line L 11-1 . The exhaust heat recovery boiler 11-1 recovers the exhaust heat of the combustion exhaust gas G 11-1 discharged by the power generation facility 10-1 and flows through the exhaust gas line L 11-1 , and recovers the exhaust heat of the combustion exhaust gas G 11-1. Is supplied to the chimney 15-1. The chimney 15-1 discharges a part of the combustion exhaust gas G 11-1 to the outside as necessary and supplies the combustion exhaust gas G 11-1 to the integrated exhaust heat recovery boiler 12.
[0061]
　The power generation facility 10-2 discharges the combustion exhaust gas G 11-2 generated by power generation to the exhaust gas line (second exhaust gas flow path) L 11-2 . A flow rate control valve V 11-2 is provided in the exhaust gas line L 11-2 . The flow rate control valve V 11-2 adjusts the flow rate of the combustion exhaust gas G 11-2 flowing through the exhaust gas line L 11-2 .
[0062]
　Integration heat recovery boiler 12, the exhaust gas line L 11-1 combustion exhaust gas G flowing through 11-1 and exhaust gas line L 11-2 combustion exhaust gas G flowing through 11-2 integrated combustion exhaust gas G is integrated 21 is supplied It The integrated exhaust heat recovery boiler 12 is provided therein with a nitrogen oxide removing section 120 for reducing and removing nitrogen oxides such as nitrogen monoxide and nitrogen dioxide contained in the integrated combustion exhaust gas G 21 .
[0063]
　Further, the exhaust gas treatment device 4 uses the gas flow rate and temperature of the integrated combustion exhaust gas G 21 measured by the first exhaust gas measurement unit 16 to open the flow control valves V 11-1 and V 11-2 . A control unit 18 that adjusts the amount of fuel supplied to the power generation equipment 10 is provided. The control unit 18 adjusts the openings of the flow rate control valves V 11-1 and V 11-2 and the supply amount of the fuel F to the power generation equipments 10-1 and 10-2 to adjust the first exhaust gas measurement unit 16 in integrated combustion exhaust gas G is measured 21 temperature is controlled to be 300 ° C. or higher 400 ° C. or less. By such control, the exhaust gas treatment device 4 sets the temperature of the integrated combustion exhaust gas G 21 supplied to the nitrogen oxides removal section 120 of the integrated exhaust heat recovery boiler 12 to a temperature suitable for decomposition and removal of nitrogen oxides. Therefore, the nitrogen oxides in the integrated combustion exhaust gas G 21 can be decomposed and removed more efficiently .
[0064]
　When the temperature of the integrated combustion exhaust gas G 21 measured by the first exhaust gas measuring unit 16 is less than 300° C. , the control unit 18 reduces the opening degree of the flow control valve V 11-1 and reduces the flow control valve V 11-. The ratio of the combustion exhaust gas G 11-2 flowing through the exhaust gas line L 11-2 in the integrated combustion exhaust gas G 21 is controlled by the control of at least one of the increase of the opening degree 2 of the combustion exhaust gas G 11 flowing through the exhaust gas line L 11-1. Increase to -1 . As a result, the combustion exhaust gas G 11-1 whose temperature has decreased after the heat recovery by the exhaust heat recovery boiler 11-1 has a high temperature, and the high temperature combustion exhaust gas G 11-2 which has not been recovered by the exhaust heat recovery boiler 11-1. Can be relatively increased, the temperature of the integrated combustion exhaust gas G 21 measured by the first exhaust gas measurement unit 16 increases. Further, the control unit 18 maintains the openings of the flow rate control valve V 11-1 and the flow rate control valve V 11-2 to increase the amount of fuel supplied to the power generation equipment 10 to increase the integrated combustion exhaust gas G 21.The temperature may be increased.
[0065]
　In addition, when the temperature of the integrated combustion exhaust gas G 21 measured by the first exhaust gas measuring unit 16 exceeds 400° C. , the control unit 18 increases the opening degree of the flow control valve V 11-1 and increases the flow control valve V 11-1. 11-2 by at least one of control of the reduction of the opening, integrated combustion exhaust gas G 21 exhaust gas line L during 11-2 combustion exhaust gas G flowing through 11-2 proportion of, the exhaust gas line L 11-1 combustion exhaust gas flowing through the Decrease with respect to G 11-1 . As a result, for the combustion exhaust gas G 11-1 whose temperature has decreased after the heat recovery by the exhaust heat recovery boiler 11-1, the high temperature combustion exhaust gas G 11-2 not recovered by the exhaust heat recovery boiler 11-1. it is possible to relatively reduce the ratio of the integrated combustion exhaust gas G is measured by the first exhaust gas measuring unit 16 21 temperature is lowered. Further, the control unit 18 maintains the openings of the flow rate control valve V 11-1 and the flow rate control valve V 11-2 to reduce the amount of fuel supplied to the power generation equipment 10 to reduce the integrated combustion exhaust gas G 21.The temperature of may be lowered. The other configurations are similar to those of the exhaust gas treatment device 1 shown in FIG.
[0066]
　Next, the overall operation of the exhaust gas treatment device 4 according to the present embodiment will be described. Exhaust heat of the combustion exhaust gas G 11-1 discharged from the power generation facility 10-1 is recovered by the exhaust heat recovery boiler 11-1 via the exhaust gas line L 11-1 , and the temperature of the combustion exhaust gas G 11-1 is lowered. After a part of the gas is discharged, it is supplied to the integrated exhaust gas line L 21 . Further, the combustion exhaust gas G 11-2 discharged from the power generation equipment 10-2 is supplied to the integrated exhaust gas line L 21 via the exhaust gas line L 11-2 . In the integrated exhaust gas line L 21 , the combustion exhaust gas G 11-1 in which the temperature of the exhaust heat recovered by the exhaust heat recovery boiler 11-1 is lowered and the combustion exhaust gas G 11-2 whose temperature is higher than that of the combustion exhaust gas G 11-1 And are integrated to form an integrated combustion exhaust gas G 21 , which is supplied to the integrated exhaust heat recovery boiler 12. Here, the control unit 18 controls the opening amounts of the flow rate control valves V 11-1 and V 11-2 and the supply amount of the fuel F supplied to the power generation facility 10 as necessary, so that the integrated combustion exhaust gas G 21The temperature is controlled to a predetermined temperature (for example, 300° C. or higher and 400° C. or lower). In the integrated combustion exhaust gas G 21 supplied to the integrated exhaust heat recovery boiler 12 , the reducing agent is supplied by the reducing agent supply section 121 of the nitrogen oxide removal section 120, and the nitrogen oxides are decomposed and removed by the selective catalyst reduction section 122. After that, it is supplied to the CO 2 recovery unit 13. Here, the control unit 18 controls the integrated combustion exhaust gas G from the reducing agent supply unit 121 so that the nitrogen oxides in the integrated combustion exhaust gas G 21 supplied to the CO 2 recovery unit 13 will be equal to or less than a predetermined value as necessary. Control the amount of reducing agent fed into 21 . The integrated combustion exhaust gas G 21 supplied to the CO 2 recovery unit 13 is discharged to the outside of the exhaust gas treatment device 4 after CO 2 is recovered by the CO 2 absorbing liquid . CO 2 integrated combustion exhaust gas G is collected by the absorption liquid 21 CO in 2 is, CO by heating 2 after being radiated from the absorption solution, CO 2 is discharged is compressed is supplied to the compression unit 14.
[0067]
　As described above, according to the above-described embodiment, the exhaust heat of the combustion exhaust gas G 11-1 discharged from the power generation facility 10-1 is provided to the exhaust gas line L 11-1 to the exhaust heat recovery boiler 11-1. The combustion exhaust gas G 11-2 discharged from the power generation equipment 10-2 and flowing through the exhaust gas line L 11-2 has a higher temperature than the combustion exhaust gas G 11-1 and is recovered after exhaust heat recovery. The integrated combustion exhaust gas G 21 is integrated with 11-1 . Thus, integrated combustion exhaust gas G is introduced into the integrated heat recovery boiler 12 21 Since the temperature of can be adjusted to a range suitable for decomposing and removing nitrogen oxides, the combustion exhaust gas G discharged from the power generation facility 10 11-1 , Nitrogen oxide in G 11-2 can be removed efficiently. Also, one of the exhaust gas lines L 11-1 and L 11-2 is an exhaust gas line L 11-2.Since it is not necessary to provide the nitrogen oxide removing section 120, it is possible to reduce an increase in equipment cost. Therefore, it is possible to realize the exhaust gas treatment device 4 capable of efficiently removing nitrogen oxides and reducing the increase in equipment cost.
[0068]
　In addition, in the above-described embodiment, the configuration in which the exhaust heat recovery boiler 11-1 is provided in the exhaust gas line L 11-1 has been described, but the exhaust heat recovery boiler 11-1 is provided in the exhaust gas line L 11-2. Alternatively, the exhaust heat recovery boiler 11-1 may be provided in both the exhaust gas line L 11-1 and the exhaust gas line L 11-2 . Exhaust gas line L 11-1 and the exhaust gas line L 11-2 when both of the provision of the heat recovery steam generator 11-1, exhaust gas line L 11-1 combustion exhaust gas G in the exhaust heat recovery boiler 11-1 11-1 And the exhaust heat recovery amount of the combustion exhaust gas G 11-2 in the exhaust heat recovery boiler 11 of the exhaust gas line L 11-2 are adjusted to adjust the integrated combustion exhaust gas G 21 to a desired temperature. It becomes possible. Further, the two power generation facilities 10-1 and 10-2 may be existing power generation facilities or newly installed power generation facilities. For example, when the power generation facility 10-1 is an existing power generation facility , the integrated combustion exhaust gas G 21 can be simply provided by newly providing the power generation facility 10-2 and the exhaust gas line L 11-2.The temperature of can be adjusted to a desired range. Further, the integrated exhaust heat recovery boiler 12 may have the configuration shown in FIGS. 3 and 4.
[0069]
　FIG. 6 is a schematic diagram showing another example of the exhaust gas treatment device 4 according to the second embodiment of the present invention. As shown in FIG. 6, the exhaust gas treatment device 5 according to the present embodiment is a combustion exhaust gas G 11 emitted from the five power generation facilities 10-1, 10-2, 10-3, 10-4, 10-5. -1 , G 11-2 , G 11-3 , G 11-4 , G 11-5 exhaust heat is recovered by the integrated exhaust heat recovery boiler 12, and then combustion exhaust gas G 11-1 , G 11-2 , G CO 2 contained in 11-3 , G 11-4 and G 11-5 is recovered by the CO 2 recovery unit 13. Exhaust gas treatment device 5, the combustion exhaust gas (first combustion gas) G 11-1 and power plant (first power plant) 10-1 for discharging the combustion exhaust gas (first combustion gas) G 11-2 for discharging the power generation Equipment (first power generation equipment) 10-2 and combustion exhaust gas (second combustion exhaust gas) G 11-3Power generation facility (second power generation facility) 10-3 that emits the exhaust gas, combustion power generation facility (second power generation facility) 10-4 that discharges the combustion exhaust gas (second combustion exhaust gas) G 11-4 , and combustion exhaust gas (the second combustion power) exhaust gas) G 11-5 power plant for discharging the (second power generation equipment) 10-5 and flue gas G 11-1 exhaust heat recovery boiler 11-1 disposed downstream of the power plant 10-1 in the flow direction of the And an exhaust heat recovery boiler 11-2 provided after the power generation facility 10-2 in the flow direction of the combustion exhaust gas G 11-2 , and an integrated exhaust heat recovery boiler provided after the exhaust heat recovery boiler 11-1. 12, a CO 2 recovery unit 13 provided at a subsequent stage of the integrated exhaust heat recovery boiler 12, and a CO 2 compression unit 14 provided at a subsequent stage of the CO 2 recovery unit 13 . A chimney 15-1 for discharging a part of the combustion exhaust gas G 11-1 is provided between the exhaust heat recovery boiler 11-1 and the integrated exhaust heat recovery boiler 12, and the exhaust heat recovery boiler 11-2 and the integrated exhaust heat recovery boiler 11-2 are integrated. A chimney 15-2 for discharging a part of the combustion exhaust gas G 11-2 is provided between the heat recovery boiler 12 and the heat recovery boiler 12 .
[0070]
　The power generation facilities 10-1 and 10-2 discharge the combustion exhaust gas G 11-1 and G 11-2 generated by power generation to the exhaust gas lines (first exhaust gas flow paths) L 11-1 and L 11-2 . Exhaust heat recovery boilers 11-1 and 11-2 , chimneys 15-1 and 15-2, and flow rate control valves V 11-1 and V 11-2 are respectively connected to the exhaust gas lines L 11-1 and L 11-2. They are provided in order. The flow rate control valves V 11-1 and V 11-2 adjust the flow rates of the combustion exhaust gas G 11-1 and G 11-2 flowing through the exhaust gas lines L 11-1 and L 11-2 , respectively. The exhaust heat recovery boilers 11-1 and 11-2 are exhausted by the power generation equipments 10-1 and 10-2, and the combustion exhaust gas G 11-1 flowing through the exhaust gas lines L 11-1 and L 11-2., G 11-2 , and exhaust gases G 11-1 and G 11-2 , from which the exhaust heat has been recovered , are supplied to the chimneys 15-1 and 15-2, respectively. The chimneys 15-1 and 15-2 supply the combustion exhaust gases G 11-1 and G 11-2 to the integrated exhaust heat recovery boiler 12 and, if necessary, one of the combustion exhaust gases G 11-1 and G 11-2 . Parts are discharged to the outside.
[0071]
　The power generation facilities 10-3, 10-4, 10-5 use the combustion exhaust gas G 11-3 , G 11-4 , G 11-5 generated by power generation as an exhaust gas line (second exhaust gas flow path) L 11-3 , It is discharged to L 11-4 and L 11-5 , respectively. Flow rate control valves V 11-3 , V 11-4 , and V 11-5 are provided in the exhaust gas lines L 11-3 , L 11-4 , and L 11-5 , respectively. The flow rate control valves V 11-3 , V 11-4 , V 11-5 are used for the combustion exhaust gas G 11-3 , G flowing through the exhaust gas lines L 11-3 , L 11-4 , L 11-5.The flow rates of 11-4 and G 11-5 are adjusted respectively.
[0072]
　The integrated exhaust heat recovery boiler 12 has combustion exhaust gas G 11-1 , G 11-2 , G flowing in the exhaust gas lines L 11-1 , L 11-2 , L 11-3 , L 11-4 , L 11-5. An integrated combustion exhaust gas G 21 in which 11-3 , G 11-4 , and G 11-5 are integrated is supplied. The integrated exhaust heat recovery boiler 12 is provided therein with a nitrogen oxide removing section 120 for reducing and removing nitrogen oxides such as nitrogen monoxide and nitrogen dioxide contained in the integrated combustion exhaust gas G 21 .
[0073]
　In addition, the exhaust gas treatment device 5 uses the flow rate control valves V 11-1 , V 11-2 , V 11-3 , and V 11-3 , based on the gas flow rate and the temperature of the integrated combustion exhaust gas G 21 measured by the first exhaust gas measurement unit 16 . A control unit 18 for adjusting the opening of V 11-4 and V 11-5 and the supply amount of fuel F to the power generation equipments 10-1, 10-2, 10-3, 10-4, 10-5 is provided. . The control unit 18 is configured to open the flow control valves V 11-1 , V 11-2 , V 11-3 , V 11-4 , V 11-5 , the power generation facilities 10-1, 10-2, 10-3, The supply amount of the fuel F to 10-4 and 10-5 is adjusted, respectively, and controlled so that the temperature of the integrated combustion exhaust gas G 21 measured by the first exhaust gas measurement unit 16 is 300° C. or higher and 400° C. or lower. By such control, the exhaust gas treatment device 5 sets the temperature of the integrated combustion exhaust gas G 21 supplied to the nitrogen oxides removal section 120 of the integrated exhaust heat recovery boiler 12 to a temperature suitable for decomposition and removal of nitrogen oxides. As a result, integrated combustion exhaust gas G 21 can be produced more efficiently. It becomes possible to decompose and remove nitrogen oxides therein.
[0074]
　When the temperature of the integrated combustion exhaust gas G 21 measured by the first exhaust gas measurement unit 16 is less than 300° C. , the control unit 18 reduces the opening degree of the flow rate control valves V 11-1 , V 11-2 and the flow rate. The exhaust gas lines L 11-3 , L 11-4 , L 11- in the integrated combustion exhaust gas G 21 are controlled by controlling at least one of the opening degrees of the control valves V 11-3 , V 11-4 , V 11-5. 5 a flow combustion exhaust gas G 11-3 , G 11-4 , G 11-5 proportion of, the exhaust gas line L 11-1 , L 11-2 combustion exhaust gas G flowing through 11-1 , G 11-2 against Increase. As a result, the combustion exhaust gas G whose temperature has decreased due to heat recovery by the exhaust heat recovery boilers 11-1 and 11-2 11-1 and G 11-2 , the proportion of high-temperature combustion exhaust gas G 11-3 , G 11-4 , and G 11-5 that has not been heat-recovered by the exhaust heat recovery boilers 11-1 and 11-2 Since it can be relatively increased, the temperature of the integrated combustion exhaust gas G 21 measured by the first exhaust gas measurement unit 16 increases. Further, the control unit 18 maintains the openings of the flow rate control valves V 11-1 , V 11-2 , V 11-3 , V 11-4 , and V 11-5 to generate power generation equipment 10-1, 10-. The temperature of the integrated combustion exhaust gas G 21 may be raised by increasing the amount of fuel supplied to 2, 10-3, 10-4, 10-5 .
[0075]
　Further, when the temperature of the integrated combustion exhaust gas G 21 measured by the first exhaust gas measuring unit 16 exceeds 400° C. , the control unit 18 increases the opening degree of the flow rate control valves V 11-1 and V 11-2. And the exhaust gas lines L 11-3 , L 11-4 , L in the integrated combustion exhaust gas G 21 by controlling at least one of the reduction of the opening degree of the flow control valves V 11-3 , V 11-4 , V 11-5. The proportion of the combustion exhaust gas G 11-3 , G 11-4 , and G 11-5 flowing through 11-5 is reduced with respect to the combustion exhaust gas G 11-1 flowing through the exhaust gas lines L 11-1 and L 11-2 . As a result, the combustion exhaust gas G 11-1 , G whose temperature has dropped due to the heat recovery by the exhaust heat recovery boilers 11-1 , 11-2 To relatively reduce the ratio of high temperature combustion exhaust gas G 11-3 , G 11-4 , G 11-5 which has not been heat-recovered by the exhaust heat recovery boilers 11-1 and 11-2 to 11-2 . since it is an integrated combustion exhaust gas G is measured by the first exhaust gas measuring unit 16 21 temperature is lowered. Further, the control unit 18 supplies the fuel to the power generation facility 10 by maintaining the openings of the flow rate control valves V 11-1 , V 11-2 , V 11-3 , V 11-4 , and V 11-5. The amount may be reduced to lower the temperature of the integrated combustion exhaust gas G 21 . Other configurations are similar to those of the exhaust gas treatment apparatus 1 shown in FIG.
[0076]
　Next, the overall operation of the exhaust gas treatment device 5 according to the present embodiment will be described. The combustion exhaust gas G 11-1 , G 11-2 discharged from the power generation facilities 10-1, 10-2 is exhaust heat recovery boilers 11-1 , 11- through exhaust gas lines L 11-1 , L 11-2. The exhaust heat is recovered by 2 to lower the temperature, and the exhaust gas is partially exhausted by the chimneys 15-1 and 15-2, and then supplied to the integrated exhaust gas line L 21 . Further, the combustion exhaust gas G 11-3 , G 11-4 , G 11-5 emitted from the power generation equipment 10-3, 10-4, 10-5 is the exhaust gas line L 11-3 , L 11-4 , L It is supplied to the integrated exhaust gas line L 21 via 11-5 . In the integrated exhaust gas line L 21 , the exhaust heat recovery boilers 11-1 and 11-2 recover the exhaust heat, and the combustion exhaust gases G 11-1 and G 11-2 whose temperature has dropped and the combustion exhaust gas G 11-1., G 11-2 , the high temperature combustion exhaust gases G 11-3 , G 11-4 , G 11-5 are integrated to form an integrated combustion exhaust gas G 21 , which is supplied to the integrated exhaust heat recovery boiler 12. Here, the control unit 18 controls the openings of the flow rate control valves V 11-1 and V 11-2 and the supply amount of the fuel supplied to the power generation facility 10 as necessary, so that the integrated combustion exhaust gas G 21 The temperature is controlled to a predetermined temperature (for example, 300° C. or higher and 400° C. or lower). In the integrated combustion exhaust gas G 21 supplied to the integrated exhaust heat recovery boiler 12 , the reducing agent is supplied by the reducing agent supply section 121 of the nitrogen oxide removal section 120, and the nitrogen oxides are decomposed and removed by the selective catalyst reduction section 122. After that, it is supplied to the CO 2 recovery unit 13. Here, the control unit 18 controls the integrated combustion exhaust gas G from the reducing agent supply unit 121 so that the nitrogen oxides in the integrated combustion exhaust gas G 21 supplied to the CO 2 recovery unit 13 will be equal to or less than a predetermined value as necessary. Control the amount of reducing agent fed into 21 . CO 2The integrated combustion exhaust gas G 21 supplied to the recovery unit 13 is discharged to the outside of the exhaust gas treatment device 5 after CO 2 is recovered by the CO 2 absorbing liquid . CO 2 integrated combustion exhaust gas G is collected by the absorption liquid 21 CO in 2 is, CO by heating 2 after being radiated from the absorption solution, CO 2 is discharged is compressed is supplied to the compression unit 14.
[0077]
　As described above, according to the above-described embodiment, the exhaust heat of the combustion exhaust gas G 11-1 , G 11-2 emitted from the power generation equipment 10-1, 10-2 is transferred to the exhaust gas lines L 11-1 , L 11 . The exhaust heat recovery boilers 11-1 and 11-2 provided in 11-2 recover the exhaust gas, while the exhaust gas lines L 11-3 and L 11- are exhausted from the power generation facilities 10-3, 10-4, and 10-5. 4 , L 11-5 combustion exhaust gas G flowing through 11-2 combustion exhaust gas G 11-1 , G 11-2 combustion exhaust gas after the exhaust heat recovery temperature is higher temperature state than the G 11-1 , G 11-2 and The integrated combustion exhaust gas G 21 is integrated . Thus, integrated combustion exhaust gas G is introduced into the integrated heat recovery boiler 12 21 Since the temperature of can be adjusted to a range suitable for decomposing and removing nitrogen oxides, nitrogen oxides in the combustion exhaust gas discharged from the power generation facility 10 Can be removed efficiently. Also, the exhaust gas line L 11-1, L 11-2 , L 11-3 , L 11-4 , L 11-5 at least one exhaust gas line (in the present embodiment, three exhaust gas lines L 11-3 , L 11-4 , L 11- In 5 ), since it is not necessary to provide the nitrogen oxide removing section 120, it is possible to reduce an increase in equipment cost. Therefore, it is possible to realize the exhaust gas treatment device 5 capable of efficiently removing nitrogen oxides and reducing the increase in equipment cost.
[0078]
　In addition, in the above-described embodiment, the configuration in which the exhaust heat recovery boilers 11-1 and 11-2 are provided in the exhaust gas lines L 11-1 and L 11-2 has been described. One exhaust gas line L 11 may be provided, and all exhaust gas lines L 11-1 , L 11-2 , L 11-3 , L 11-4 , and L 11-5 may be provided with the exhaust heat recovery boiler 11. Good. In this case, the combustion exhaust gas G 11-1 , G 11-2 in the exhaust heat recovery boiler 11 of the exhaust gas lines L 11-1 , L 11-2 , L 11-3 , L 11-4 , L 11-5 , G 11-3 , G 11-4 , G 11-5It is possible to adjust the integrated combustion exhaust gas G 21 to a desired temperature by varying the exhaust heat recovery amount of . Further, each of the power generation facilities 10-1, 10-2, 10-3, 10-4, 10-5 may be an existing power generation facility or a newly installed power generation facility. Further, the integrated exhaust heat recovery boiler 12 may have the configuration shown in FIGS. 3 and 4.
[0079]
(Example)
　The present inventors, CO in the exhaust gas treatment apparatus according to the above embodiment 2 nitrogen oxides into the absorption liquid (NO 2 were investigated in detail the effect of reducing) The contents investigated by the present inventors will be described below.
[0080]
　FIG. 7 is an explanatory diagram of the amount of nitrogen oxide-derived components accumulated in the CO 2 absorbent of the exhaust gas treatment devices according to the examples and the comparative examples . In FIG. 7, the nitrogen oxides when the exhaust gas temperature of the integrated combustion exhaust gas G 21 introduced into the nitrogen oxide removing unit 120 is set in the range of 300° C. or higher and 400° C. or lower by the exhaust gas treatment device according to the above embodiment. The accumulation amount of the causative component (see the example) is compared with the accumulated amount of the nitrogen oxide-caused component (see the comparative example) when the exhaust gas temperature of the combustion exhaust gas introduced into the nitrogen oxide removing section 120 is set to 250°C. Is shown. As shown in FIG. 7, the integrated combustion exhaust gas G 21 by adjusting the exhaust gas temperature in the range of 300 ° C. or higher 400 ° C. or less, in comparison with the case where the exhaust gas temperature of the combustion exhaust gas to 250 ° C., CO 2 absorbing solution It is possible to reduce the amount of nitrogen oxide-derived components accumulated in the sample by about 0.2 times, and reduce the reclaiming frequency of the CO 2 absorbing solution to about 1/5. From this result, according to the exhaust gas treatment device of the above-described embodiment, it is possible to significantly reduce the nitrogen oxides accumulated in the CO 2 absorbent, and it is possible to reduce the operating cost of the exhaust gas treatment device. I understand.
Explanation of symbols
[0081]
　1, 2, 3, 4, 5 Exhaust gas treatment device
　10, 10-1, 10-2, 10-3, 10-4, 10-5 Power generation equipment
　11 Exhaust heat recovery boiler
　12 Integrated exhaust heat recovery boiler
　13 CO 2 recovery Part
　14 CO 2 compression part
　15 Chimney
　16 First exhaust gas measurement part
　17 Second exhaust gas measurement part
　18 Control part
　19 Low pressure steam turbine
　20 Medium pressure/high pressure steam turbine
　210 Gas turbine
　211 Compressor
　212 Combustor
　213 Turbine
　221 Low pressure steam turbine
　222 Medium/high pressure steam turbine
　222A Medium
　pressure steam turbine 222B High pressure steam turbine
　230 Generator
　240 Turbine shaft
　A Air
　F Fuel
　G 11 , G 11-1 , G 11-2 , G 11-3 , G 11-4 , G 11-5　Combustion exhaust gas
　G 21　Integrated combustion exhaust gas
　L 11 , L 11-1 , L 11-2 , L 11-3 , L 11-4 , L 11-5　Exhaust gas line
　L 11A　Main exhaust gas line
　L 11B　Branch exhaust gas line
　L 21　Integrated exhaust gas line
　V 11A , V 11B , V 11-1, V 11-2 , V 11-3 , V 11-4 , V 11-5　flow control valve
　
The scope of the claims
[Claim 1]
　A first exhaust gas flow path through which a first combustion exhaust gas discharged from a power generation facility flows;
　an exhaust heat recovery unit provided in the first exhaust gas flow path for recovering exhaust heat of the first combustion exhaust gas; and
　the first exhaust gas At least a part of the first combustion exhaust gas, which is provided so as to branch from the first exhaust gas flow passage between the first stage and the second stage of the exhaust heat recovery unit in the flow passage, and which flows through the first exhaust gas flow passage is the second combustion. A second exhaust gas flow path that branches as exhaust gas,
　the first combustion exhaust gas that flows through the first exhaust gas flow path where the exhaust heat is recovered by the exhaust heat recovery unit, and the first exhaust gas flow that flows through the second exhaust gas flow path. a nitrogen oxide removal unit for removing a nitrogen oxide in the combustion temperature is relatively more exhaust gas is high the integrated combustion exhaust gas which the second and the combustion exhaust gas to integrate,
　removing the nitrogen oxides in the nitrogen oxide removal unit and said integration and integrated heat recovery unit for recovering exhaust heat of the combustion exhaust gas,
　the integrated heat recovery unit waste heat CO in the integrated flue gas recovered at 2 a CO 2 CO is recovered by recovery liquid 2 recovery And an exhaust gas treatment device.
[Claim 2]
　The integrated combustion exhaust gas introduced into the nitrogen oxide removing unit by adjusting the flow rate of the first combustion exhaust gas flowing through the first exhaust gas flow path and the flow rate of the second combustion exhaust gas flowing through the second exhaust gas flow path. The exhaust gas treating apparatus according to claim 1, further comprising a control unit that controls the temperature of the above to 300°C or more and 400°C or less.
[Claim 3]
　Provided in a first exhaust gas flow path in which the first combustion exhaust gas discharged from the first power generation facility flows, a second exhaust gas flow path
　in which the second combustion exhaust gas discharged from the second power generation facility flows, and
　the first exhaust gas flow path And an
　exhaust heat recovery part for recovering exhaust heat of the first combustion exhaust gas, the first combustion exhaust gas flowing through the first exhaust gas flow path in which the exhaust heat is recovered in the exhaust heat recovery part, and the second exhaust gas A nitrogen oxide removing unit for removing nitrogen oxides in the integrated combustion exhaust gas, which is integrated with the second combustion exhaust gas having a temperature relatively higher than that of the first combustion exhaust gas flowing through the flow path, and the
　nitrogen oxide removal unit. An integrated exhaust heat recovery unit that recovers exhaust heat of the integrated combustion exhaust gas from which the nitrogen oxides have been removed, and
　CO 2 in the integrated combustion exhaust gas whose exhaust heat has been recovered by the integrated exhaust heat recovery unit is a CO 2 recovery liquid. An exhaust gas treatment apparatus, comprising: a CO 2 recovery unit for recovering by means of
[Claim 4]
　The flow rate of the combustion exhaust gas flowing through the first exhaust gas flow passage and the second exhaust gas flow passage is adjusted, and the temperature of the integrated combustion exhaust gas introduced into the nitrogen oxide removing unit is controlled to 300°C or higher and 400°C or lower. The exhaust gas treating apparatus according to claim 3, further comprising a control unit.
[Claim 5]
　The exhaust gas treatment apparatus according to claim 1, wherein the nitrogen oxide removing unit is provided in the integrated exhaust heat recovery unit.
[Claim 6]
　The said nitrogen oxide removal part was equipped with the nitrogen oxide removal catalyst which removes the said nitrogen oxide, and the reducing agent injection|pouring part which injects a reducing agent. Exhaust gas treatment equipment.
[Claim 7]
The exhaust gas treatment apparatus according to claim 6, further comprising a control unit that controls a supply amount of the reducing agent based on a gas flow rate and a nitrogen oxide concentration of the integrated combustion exhaust gas introduced into the 　CO 2 recovery unit.
[Claim 8]
　The integrated exhaust heat recovery unit generates and generates steam for driving a CO 2 compression unit that compresses CO 2 discharged from the CO 2 recovery unit by exhaust heat of the integrated combustion exhaust gas from which the nitrogen oxides have been removed . CO 2 compression unit driving steam CO 2 supplied to the compression unit, the exhaust gas treatment device according to any one of claims 1 to 7.
[Claim 9]
　The integrated exhaust heat recovery unit generates turbine driving steam by exhaust heat of the integrated combustion exhaust gas from which the nitrogen oxides have been removed, and supplies the generated turbine driving steam to a steam turbine. 8. The exhaust gas treatment device according to any one of 8 above.
[Claim 10]
　A heating unit that heats the integrated combustion exhaust gas is provided in the preceding stage of the nitrogen oxide removal unit, and the integrated exhaust heat recovery unit generates turbine driving steam by exhaust heat of the integrated combustion exhaust gas heated by the heating unit. The exhaust gas treatment device according to claim 1, wherein the generated steam for driving the turbine is supplied to the steam turbine.
[Claim 11]
　The temperature and gas flow rate of the integrated combustion exhaust gas introduced into the nitrogen oxide removing unit is measured, and based on the measured temperature and gas flow rate, the amount of fuel supplied to the combustor of the power generation facility and the steam turbine. The exhaust gas treatment apparatus according to claim 9 or 10, further comprising a control unit that controls at least one of the steam supply amounts of.
[Claim 12]
　The exhaust gas treatment device according to any one of claims 1 to 11, wherein the power generation facility includes an existing power generation facility.
[Claim 13]
　A first combustion exhaust gas discharged from the power generator and having exhaust heat recovered in an exhaust heat recovery unit provided in the first exhaust gas flow path; and a front stage and a rear stage of the exhaust heat recovery unit in the first exhaust gas flow path. Integration that integrates the second combustion exhaust gas having a temperature relatively higher than that of the first combustion exhaust gas in which the exhaust heat is recovered in the exhaust heat recovery unit that has flowed through the second exhaust gas flow path connected between A nitrogen oxide removal step of removing
　nitrogen oxides in the combustion exhaust gas, an integrated exhaust heat recovery step of recovering exhaust heat of the integrated combustion exhaust gas from which the nitrogen oxides are removed, and an exhaust heat recovery step in the
　integrated exhaust heat recovery step recovered CO of the integrated combustion exhaust gas 2 a CO 2 CO is recovered by the recovery liquid 2 , characterized in that it comprises a recovery step, the exhaust gas treatment method.
[Claim 14]
　The first combustion exhaust gas discharged from the first power generation device and having exhaust heat recovered by the exhaust heat recovery unit provided in the first exhaust gas flow path, and the second combustion exhaust gas discharged from the second power generation device and flowed through the second exhaust gas flow path A nitrogen oxide removing step of removing nitrogen oxides in the integrated combustion exhaust gas, which is integrated with the second combustion exhaust gas having a relatively higher temperature than the first combustion exhaust gas whose exhaust heat is recovered in the exhaust heat recovery unit; ,
　Nitrogen in the integrated combustion exhaust gas that integrates the combustion exhaust gas flowing through a plurality of exhaust gas passages in which exhaust combustion exhaust gas flows and at least one exhaust heat recovery unit that recovers exhaust heat of the combustion exhaust gas is provided a nitrogen oxide removing step of removing the oxide,
　the integrated heat recovery step of recovering the exhaust heat of the integrated combustion exhaust gas to remove said nitrogen oxides,
　the exhaust heat is recovered in the integrated heat recovery step CO in the integrated flue gas 2 a CO 2 CO is recovered by the recovery liquid 2 , characterized in that it comprises a recovery step, the exhaust gas treatment method.