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.
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 due to 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 the CO 2 recovery device is provided at the front stage. A nitrogen oxide removing device that removes nitrogen oxides in the exhaust gas is provided. On the other hand, when the gas turbine is in a low power generation load state during operation, the emission amount of nitrogen oxides in the combustion exhaust gas remarkably increases, and even if a nitrogen oxide removal device is provided before the CO 2 recovery device, The nitrogen oxides therein may not always be sufficiently removed. The nitrogen oxides remaining in the flue gas, the storage component due to nitrogen oxides CO 2 CO recovery unit 2 accumulates in the absorption solution, CO 2 reclaiming to remove accumulated components due to nitrogen oxide from the absorption liquid The frequency of processing may increase and operating costs may increase.
[0005]
　An object of the present invention is to provide an exhaust gas treatment device and an exhaust gas treatment method capable of reducing the amount of nitrogen oxide-derived components accumulated in a CO 2 absorbing liquid and reducing operating costs.
Means for solving the problems
[0006]
　The exhaust gas treatment apparatus of the present invention includes a first exhaust gas flow path in which a first combustion exhaust gas discharged from a first power generation facility flows, and a second exhaust gas flow path in which a second combustion exhaust gas discharged from a second power generation facility flows. The second combustion exhaust gas that is provided by branching from at least one of the first exhaust gas flow passage and the second exhaust gas flow passage and that flows through the first exhaust gas flow passage and the second exhaust gas flow passage. An exhaust gas exhaust flow path for exhausting at least a part of at least one of them as exhaust combustion exhaust gas, and a first combustion exhaust gas flowing through the first exhaust gas flow path and a second combustion exhaust gas flowing through the second exhaust gas flow path are integrated. A nitrogen oxide removing unit for removing nitrogen oxides in the combustion exhaust gas; an integrated exhaust heat recovery unit for recovering exhaust heat of the integrated combustion exhaust gas from which nitrogen oxides have been removed by the nitrogen oxide removing unit; CO in the integrated flue gas waste heat is recovered by the heat recovery unit 2 to CO 2 CO is recovered by the recovery liquid 2 , characterized in that it comprises a recovery unit.
[0007]
　According to this configuration, when the amount of nitrogen oxides in the combustion exhaust gas discharged from at least one of the first power generation facility and the second power generation facility increases, the concentration of nitrogen oxides increases via the exhaust gas exhaust flow passage. At least one of the first combustion exhaust gas and the second combustion exhaust gas can be discharged to the outside. As a result, the exhaust gas treatment device can adjust the concentration of nitrogen oxides in the integrated combustion exhaust gas introduced into the nitrogen oxide removal unit to a concentration range suitable for the decomposition treatment of nitrogen oxides. It becomes possible to efficiently decompose and remove nitrogen oxides therein. Therefore, it is possible to reduce the amount of nitrogen oxide-derived components accumulated in the CO 2 absorbing liquid, and to realize an exhaust gas treatment device capable of reducing operating costs.
[0008]
　The exhaust gas treatment apparatus of the present invention preferably comprises an exhaust heat recovery unit for recovering exhaust heat of the exhaust combustion exhaust gas flowing through the exhaust gas exhaust passage. With this configuration, the exhaust gas treatment device can recover the exhaust heat of the combustion exhaust gas flowing through at least one of the first exhaust gas passage and the second exhaust gas passage by the exhaust heat recovery unit, so 2 It becomes possible to effectively utilize the exhaust heat of the combustion exhaust gas.
[0009]
　The exhaust gas treatment apparatus of the present invention preferably includes a control unit that controls the flow rates of the first combustion exhaust gas and the second combustion exhaust gas that are introduced into the integrated exhaust heat recovery unit. With this configuration, the exhaust gas treatment device controls the flow rates of the first combustion exhaust gas and the second combustion exhaust gas that are introduced into the integrated exhaust heat recovery unit, so that the first power generation facility and the second power generation facility whose power generation load has decreased. Since at least a part of the first combustion exhaust gas and the second combustion exhaust gas discharged from at least one side can be discharged to the outside, the concentration of nitrogen oxides in the integrated combustion exhaust gas introduced into the nitrogen oxide removing section is adjusted to the level of nitrogen oxides. It can be easily adjusted to a concentration range suitable for decomposition treatment.
[0010]
　In the exhaust gas treatment apparatus of the present invention, the control unit introduces the first combustion exhaust gas and the second combustion exhaust gas into the integrated exhaust heat recovery unit based on the power generation loads of the first power generation facility and the second power generation facility. It is preferable to control the flow rate of the combustion exhaust gas. With this configuration, the exhaust gas treatment device can discharge at least a part of the first combustion exhaust gas and the second combustion exhaust gas discharged from at least one of the first power generation facility and the second power generation facility with a reduced power generation load, It is possible to easily adjust the concentration of nitrogen oxides in the integrated combustion exhaust gas introduced into the nitrogen oxides removal section to a concentration range suitable for the decomposition treatment of nitrogen oxides.
[0011]
　In the exhaust gas treatment apparatus of the present invention, the control unit introduces the first combustion as the power generation load into the integrated exhaust heat recovery unit based on the power generation outputs of the first power generation facility and the second power generation facility. It is preferable to control the flow rates of the exhaust gas and the second combustion exhaust gas. With this configuration, the exhaust gas treatment device can discharge at least a part of the first combustion exhaust gas and the second combustion exhaust gas discharged from at least one of the first power generation facility and the second power generation facility whose power generation output has decreased, It is possible to easily adjust the concentration of nitrogen oxides in the integrated combustion exhaust gas introduced into the nitrogen oxides removal section to a concentration range suitable for the decomposition treatment of nitrogen oxides.
[0012]
　In the exhaust gas treatment device of the present invention, the control unit, as the power generation load, the flow rate of the first combustion exhaust gas flowing through the first exhaust gas flow path, the flow rate of the second combustion exhaust gas flowing through the second exhaust gas flow path. And it is preferable to control the flow rates of the first combustion exhaust gas and the second combustion exhaust gas to be introduced into the integrated exhaust heat recovery unit, based on at least one of the flow rates of the exhaust combustion exhaust gas flowing through the exhaust gas exhaust passage. .. With this configuration, the exhaust gas treatment device includes at least the first combustion exhaust gas and the second combustion exhaust gas discharged from at least one of the first power generation facility and the second power generation facility in which the flow rates of the first combustion exhaust gas and the second combustion exhaust gas have decreased. Since a part of it can be discharged to the outside, the concentration of nitrogen oxide in the integrated combustion exhaust gas introduced into the nitrogen oxide removing portion can be easily adjusted to a concentration range suitable for the decomposition treatment of nitrogen oxide.
[0013]
　In the exhaust gas treating apparatus of the present invention, the control unit, based on the exhaust gas load calculated based on the following formula (1), when the power generation load becomes equal to or less than a predetermined threshold value, the integrated exhaust heat recovery. It is preferable to control the flow rates of the first combustion exhaust gas and the second combustion exhaust gas introduced into the section. With this configuration, the exhaust gas treatment device controls the flow rates of the first combustion exhaust gas and the second combustion exhaust gas to be introduced into the integrated exhaust heat recovery unit based on the exhaust gas load, so that the first power generation equipment having a reduced exhaust gas load and At least a part of the first flue gas and the second flue gas discharged from at least one of the second power generation facilities can be discharged to the outside, and the concentration of nitrogen oxides in the integrated flue gas introduced into the nitrogen oxide removing section can be adjusted. It can be easily adjusted to a concentration range suitable for the decomposition treatment of nitrogen oxides.
　Exhaust gas load (%)=flow rate of first combustion exhaust gas or second combustion exhaust gas flowing through first exhaust gas flow path or second exhaust gas flow path to be measured/first flow through first exhaust gas flow path or second exhaust gas flow path Rated flow rate of flue gas or second flue gas x 100... Formula (1)
[0014]
　In the exhaust gas treating apparatus of the present invention, the flow rates of the first combustion exhaust gas and the second combustion exhaust gas introduced into the nitrogen oxide removing unit are adjusted so that the temperature of the integrated combustion exhaust gas is 300° C. or higher and 400° C. or lower. It is preferable to have a control unit for controlling. 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.
[0015]
　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.
[0016]
　In the exhaust gas treatment apparatus of the present invention, it is preferable that the nitrogen oxide removing unit includes a nitrogen oxide removing catalyst that removes nitrogen oxides 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.
[0017]
　In the exhaust gas treatment apparatus of the present invention, it is preferable to include 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. .. With this configuration, nitrogen oxides in the integrated combustion exhaust gas introduced into the CO 2 recovery unit can be controlled within a desired concentration range.
[0018]
　In the exhaust gas treating apparatus of the present invention, the integrated exhaust heat recovery unit drives 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. It is preferable to generate the steam for use in the CO 2 compressor and to supply the generated steam for driving the CO 2 compressor to the CO 2 compressor . 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.
[0019]
　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.
[0020]
　In the exhaust gas treatment apparatus of the present invention, 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, it is supplied to the combustor of the power generation facility. It is preferable to include a control unit that controls at least one of the amount of fuel to be used 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.
[0021]
　In the exhaust gas treatment device of the present invention, it is preferable that at least one of the first power generation facility and the second power generation facility includes an existing power generation facility. With this configuration, by providing the first exhaust gas flow path and the second exhaust gas flow path even for the existing power generation equipment, the concentration of nitrogen oxides contained in the integrated combustion exhaust gas is in a range suitable for decomposition and removal of nitrogen oxides. Since it can be adjusted to, it is possible to reduce the increase in equipment cost.
[0022]
　The exhaust gas treatment method of the present invention, when the power generation load of at least one of the first power generation facility and the second power generation facility is less than a predetermined threshold value, the first power generation facility having the power generation load lower than the predetermined threshold value A combustion exhaust gas discharging step of discharging at least a part of the discharged first combustion exhaust gas and a second combustion exhaust gas discharged from the second power generation facility, and at least a part of the combustion exhaust gas discharging step being discharged to the outside. A nitrogen oxide removing step of removing the nitrogen oxides in the integrated combustion exhaust gas by integrating the first combustion exhaust gas and the second combustion exhaust gas, and the integrated combustion exhaust gas removing the nitrogen oxides in the nitrogen oxide removal step of the integrated heat recovery step of recovering the exhaust heat, CO in the integrated flue gas waste heat is recovered in the integrated heat recovery step 2 the CO 2 CO is recovered by the recovery liquid 2 ; and a recovery step It is characterized by
[0023]
　According to this method, when the amount of nitrogen oxides in the combustion exhaust gas discharged from at least one of the first power generation facility and the second power generation facility increases, the first combustion exhaust gas and the second combustion exhaust gas in which the concentration of nitrogen oxides has increased It becomes possible to discharge at least one of the combustion exhaust gas to the outside. As a result, the exhaust gas treatment device can adjust the concentration of nitrogen oxides in the integrated combustion exhaust gas to a concentration range suitable for the decomposition treatment of nitrogen oxides, so that the nitrogen oxides in the integrated combustion exhaust gas can be efficiently decomposed. It can be removed. Therefore, the amount of nitrogen oxide-derived components accumulated in the CO 2 absorbing solution can be reduced, and an exhaust gas treatment method capable of reducing operating costs can be realized.
Effect of the invention
[0024]
　According to the present invention, it is possible to realize an exhaust gas treatment apparatus and an exhaust gas treatment method capable of reducing the amount of nitrogen oxide-derived components accumulated in a CO 2 absorbing liquid and reducing operating costs.
Brief description of the drawings
[0025]
FIG. 1 is a schematic diagram showing an example of an exhaust gas treating apparatus according to an embodiment of the present invention.
FIG. 2 is a schematic diagram of power generation equipment according to an embodiment of the present invention.
FIG. 3 is a diagram showing a relationship between an exhaust gas load and an amount of nitrogen oxide-derived components accumulated in a CO 2 absorbing solution.
FIG. 4 is a schematic diagram showing another example of the exhaust gas treating apparatus according to the embodiment of the present invention.
FIG. 5 is a schematic diagram showing another example of the exhaust gas treating apparatus according to the embodiment of the present invention.
FIG. 6 is a schematic diagram showing another example of the exhaust gas treating apparatus according to the embodiment of the present invention.
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]
　The inventors of the present invention have noticed that in the conventional exhaust gas treatment apparatus, when the power generation load of the power generation facility is reduced, the amount of nitrogen oxides in the combustion exhaust gas discharged from the power generation facility is significantly increased. Then, the present inventors have conceived of exhausting the combustion exhaust gas, in which the power generation load is reduced and the nitrogen oxides are increased, through the exhaust gas exhaust flow passage, out of the plurality of power generation facilities. As a result, the inventors of the present invention can reduce the concentration of nitrogen oxides in the integrated combustion exhaust gas that integrates the combustion exhaust gas discharged from a plurality of power generation facilities, and can reduce the nitrogen oxide-derived component in the CO 2 absorbing liquid. The inventors have found that the accumulated amount can be reduced and the operating cost can be reduced, and have completed the present invention.
[0027]
　Hereinafter, an embodiment 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]
　FIG. 1 is a schematic diagram showing an example of an exhaust gas treatment device 1 according to an embodiment of the present invention. As shown in FIG. 1, an exhaust gas treatment apparatus 1 according to the present embodiment is a combustion exhaust gas (first combustion exhaust gas) G emitted from a power generation facility (first power generation facility) 10-1 that generates a combustion exhaust gas G 11. 11-1 and the power generation facility (second power generation facility) 10-2 , the exhaust heat of the combustion exhaust gas (second combustion exhaust gas) G 11-2 is recovered by the integrated exhaust heat recovery boiler 12, and then the integrated combustion exhaust gas G21. The CO 2 contained in is collected and discharged by the CO 2 collection unit 13. The exhaust gas processing apparatus 1 includes a power generation facility 10-1 for discharging combustion exhaust gas G 11-1 , a power generation facility 10-2 for discharging combustion exhaust gas G 11-2, and a power generation facility 10-in the flow direction of combustion exhaust gas G 11. Exhaust gas exhaust heat recovery boiler 11 and integrated exhaust heat recovery boiler 12 provided in the subsequent stage, CO 2 recovery unit 13 provided in the subsequent stage of integrated exhaust heat recovery boiler 12, and provided in the subsequent stage of CO 2 recovery unit 13 The CO 2 compression unit 14 is provided. In the subsequent stage of the exhaust heat recovery boiler 11, combustion exhaust gas G 11Is provided with a chimney 15 for discharging a part of.
[0029]
　FIG. 2 is a schematic diagram of the power generation facilities 10-1 and 10-2 according to the present embodiment. In FIG. 2, since the power generation equipments 10-1 and 10-2 have the same configuration, they are shown as the power generation equipment 10. 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 with the fuel F, and a turbine 213 that is rotationally driven by the combustion gas generated in the combustor 212. Prepare 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 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 a turbine 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 10-1 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 supplies the combustion exhaust gas G 11-1 discharged from the power generation facility 10-1 to the integrated exhaust heat recovery boiler 12. Exhaust gas line L 11-1 , the exhaust gas line L 11-1 combustion exhaust gas G flowing through 11-1 flow control valve V for adjusting the flow rate of 11-1 is provided. Further, the exhaust gas line L 11-1 is branched from the exhaust gas line L 11-1 after the flow control valve V 11-1 between the power generation equipment 10-1 and the integrated exhaust heat recovery boiler 12 ( Exhaust gas exhaust flow path) L 12-1 is provided. The exhaust gas exhaust line L 12-1 is provided with a flow rate control valve V 12-1 , an exhaust heat recovery steam generator 11, and a chimney 15 in this order. Flow control valve V 12-1Adjusts the flow rate of the exhaust combustion exhaust gas G 12-1 flowing through the exhaust gas exhaust line L 12-1 . The exhaust heat recovery steam generator 11 recovers the exhaust heat of the exhaust combustion exhaust gas G 12-1 flowing through the exhaust gas exhaust line L 12-1 , and supplies the exhaust combustion exhaust gas G 12-1 from which the exhaust heat has been recovered to the chimney 15. The chimney 15 discharges the exhaust combustion exhaust gas G 12-1 whose exhaust heat has been recovered to the outside. The exhaust heat recovery steam generator 11 does not necessarily have to be provided.
[0032]
　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 . The exhaust gas line L 11-2 supplies the combustion exhaust gas G 11-2 discharged from the power generation facility 10-2 to the integrated exhaust heat recovery boiler 12. Exhaust gas line L 11-2 , the exhaust gas line L 11-1 combustion exhaust gas G flowing through 11-1 flow control valve V for adjusting the flow rate of 11-2 is provided. Further, the exhaust gas line L 11-2 is branched from the exhaust gas line L 11-2 after the flow control valve V 11-2 between the power generation facility 10-2 and the integrated exhaust heat recovery boiler 12 ( Exhaust gas exhaust flow path) L 12-2 is provided. The exhaust gas exhaust line L 12-2 has a flow rate control valve V for adjusting the flow rate of the exhaust combustion exhaust gas G 12-2 flowing through the exhaust gas exhaust line L 12-2.12-2 is provided. Further, the exhaust gas exhaust line L 12-2 is connected to the exhaust gas exhaust line L 12-1 to form an integrated exhaust gas exhaust line L 31 .
[0033]
　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 flue gas G21 which is integrated is supplied . The integrated exhaust heat recovery boiler 12 recovers the exhaust heat of the integrated combustion exhaust gas G21. 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 G21. 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]
　The nitrogen oxide removing unit 120 is provided in a stage subsequent to the reducing agent supply unit 121 that injects the reducing agent that reduces the nitrogen oxides into the integrated combustion exhaust gas G21 and the reducing agent supply unit 121, and selectively reduces the nitrogen oxides. And a selective catalytic reduction (SCR) unit 122 filled with a denitration catalyst. 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]
　The integrated exhaust heat recovery boiler 12 supplies the reducing agent from the reducing agent supply section 121 into the integrated combustion exhaust gas G21 at the nitrogen oxide removal section 120, and decomposes the nitrogen oxide supplied with the reducing agent at the selective catalytic reduction section 122. To process. Further, the integrated exhaust heat recovery boiler 12 recovers the exhaust heat of the integrated combustion exhaust gas G21 in which the nitrogen oxides are decomposed and supplies the integrated combustion exhaust gas G21 from which the exhaust heat is recovered to the CO 2 recovery unit 13.
[0036]
　CO 2 recovery unit 13, the carbon dioxide in the integrated flue gas G21 (CO 2 a) CO 2 CO is recovered by an absorption liquid 2 and absorption tower, CO 2 CO absorbed 2 by heating the absorption liquid CO 2 absorbing solution CO 2 regeneration tower to dissipate CO 2 from 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 G21 , and for example, an amine-based absorption liquid can be used. Further, the CO 2 recovery unit 13 discharges the integrated combustion exhaust gas G21 that has recovered CO 2 to the outside, and supplies the recovered CO 2 to the CO 2 compression unit 14. The CO 2 compression unit 14 supplies the CO 2 supplied from the CO 2 recovery unit 13. Is compressed and discharged.
[0037]
　Further, the exhaust gas processing device 1 includes a first exhaust gas measurement unit 16 that measures the gas flow rate and temperature of the integrated combustion exhaust gas G21 that is introduced into the integrated exhaust heat recovery boiler 12, and an integrated combustion exhaust gas that is introduced into the CO 2 recovery unit 13. The second exhaust gas measuring unit 17 for measuring the gas flow rate and the nitrogen oxide concentration of G21, the flow rates of the combustion exhaust gas G11-1 , G11-2 introduced into the integrated exhaust heat recovery boiler 12, and the fuel F to the power generation facility 10 Control unit 18 that controls the supply amount of the reducing agent and the supply amount of the reducing agent that is supplied from the reducing agent supply unit 121 into the integrated combustion exhaust gas G21, and the combustion exhaust gas G 11- that flows through the exhaust gas lines L 11-1 and L 11-2. 1 , a flow rate measuring unit 19 for measuring the flow rate of G 11-2 and the flow rate of the exhaust combustion exhaust gas G 12-1 , G 12-2 flowing through the exhaust gas exhaust lines L 12-1 , L 12-2 , and the power generation facility 10- An output measurement unit 20 for measuring the power generation output of the power supply units 1 and 10-2. Gas flow rate and temperature measurement in the first exhaust gas measurement unit 16, gas flow rate and nitrogen oxide concentration measurement in the second exhaust gas measurement unit 17, combustion exhaust gas G 11-1 , G in the flow rate measurement unit 19 The measurement of the flow rates of 11-2 and the exhaust combustion exhaust gas G 12-1 , G 12-2 and the measurement of the power generation output of the power generation equipments 10-1 and 10-2 in the output measurement unit 20 are performed by a conventionally known method. ..
[0038]
　The control unit 18 controls the flow rate control valves V 11-1 , V 11-2 , V 12-1 , V 12-2 based on the gas flow rate and the temperature of the integrated combustion exhaust gas G21 measured by the first exhaust gas measurement unit 16. And the amount of fuel supplied to the power generation facility 10 are adjusted. The control unit 18 also flows through the exhaust gas line L 11-1 , the flow rate of the combustion exhaust gas G 11-1 , the flow rate of the combustion exhaust gas G 11-2 through the exhaust gas line L 11-2 , and the exhaust gas exhaust line L 12-1 . Integration based on at least one of the flow rate of the exhaust combustion exhaust gas G 12-1, the flow rate of the exhaust combustion exhaust gas G 12-2 flowing through the exhaust gas exhaust line L 12-2 , and the power generation output of the power generation facilities 10-1 and 10-2. Combustion exhaust gas G 11-1 , G 11-2 introduced into the exhaust heat recovery boiler 12 Control the flow rate of. 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 G21 measured by the second exhaust gas measurement unit 17.
[0039]
　The control unit 18 adjusts the opening degrees of the flow rate control valves V 11-1 , V 11-2 , V 12-1 , and V 12-2 based on the power generation loads of the power generation equipments 10-1 and 10-2 to control the exhaust gas. The flow rate of the exhaust combustion exhaust gas G 12-1, G 12-2 flowing through the exhaust lines L 12-1 , L 12-2 is controlled. As the power generation load, for example, when the power generation output of the power generation facility 10-1 measured by the output measurement unit 20 is less than a predetermined threshold value set in advance, the control unit 18 controls the flow control valve V 11-1. At least one of the reduction of the opening degree and the increase of the flow rate control valve V 12-1 is controlled. As a result, the combustion exhaust gas G 11-1 in which the concentration of nitrogen oxides has increased due to the decrease in the power generation output can be discharged as the exhaust combustion exhaust gas G 12-1 , and therefore the concentration of nitrogen oxides in the integrated combustion exhaust gas G21. Can be reduced. As a result, it is possible to reduce the introduction amount of nitrogen oxides in the integrated heat recovery boiler 12, CO 2 CO recovery unit 13 2The amount of nitrogen oxide-derived components accumulated in the recovered liquid can be reduced. The control unit 18 increases the opening degree of the flow rate control valve V 11-1 and increases the opening degree of the flow rate control valve V 12-1 when the power generation output of the power generation equipment 10-1 becomes equal to or more than a predetermined threshold value set in advance . At least one of the reduction of the opening is controlled. As a result, the exhaust combustion exhaust gas G 12-1 in which the concentration of nitrogen oxides has decreased due to the increase in the power generation output can be introduced into the integrated exhaust heat recovery boiler 12 as the combustion exhaust gas G 11-1 , so that the integrated exhaust heat recovery boiler 12 It is possible to increase the recovery amount of exhaust heat at 12.
[0040]
　In addition, when the power generation load of the power generation facility 10-2 measured by the output measurement unit 20 is less than a predetermined threshold value set in advance, the control unit 18 determines that the flow control valve V 11 -2 is reduced and at least one of the flow control valve V 12-2 is increased. As a result, the exhaust combustion exhaust gas G 12-1 in which the concentration of nitrogen oxides has increased due to the decrease in the power generation output can be discharged as the exhaust combustion exhaust gas G 12-2 . The concentration can be reduced. As a result, it is possible to reduce the introduction amount of nitrogen oxides in the integrated heat recovery boiler 12, CO 2 CO recovery unit 13 2 can be reduced accumulation of nitrogen oxides due components in the recovery liquid . The control unit 18 increases the opening degree of the flow rate control valve V 11-2 and increases the opening degree of the flow rate control valve V 12-2 when the power generation output of the power generation equipment 10-2 becomes equal to or more than a predetermined threshold value set in advance . At least one of the reduction of the opening is controlled. As a result, the exhaust combustion exhaust gas G 12-2 whose concentration of nitrogen oxides has decreased due to the increase in power generation output is converted into the combustion exhaust gas G 11-2.Since it can be introduced into the integrated exhaust heat recovery boiler 12, the amount of exhaust heat recovered in the integrated exhaust heat recovery boiler 12 can be increased.
[0041]
　When the flow rate of the combustion exhaust gas G 11-1 flowing through the exhaust gas line L 11-1 measured by the flow rate measuring unit 19 is less than a preset threshold value as the power generation load , At least one of the reduction of the opening degree of the flow rate control valve V 11-1 and the increase of the opening degree of the flow rate control valve V 12-1 is controlled. As a result, the flow rate decreases as the power generation output decreases, and the combustion exhaust gas G 11-1 with an increased concentration of nitrogen oxides can be discharged as the exhaust combustion exhaust gas G 12-1. The concentration of nitrogen oxides therein can be reduced. As a result, it is possible to reduce the introduction amount of nitrogen oxides in the integrated heat recovery boiler 12, CO 2 CO recovery unit 13 2 can be reduced accumulation of nitrogen oxides due components in the recovery liquid .. When the flow rate of the combustion exhaust gas G 11-1 flowing through the exhaust gas exhaust line L 12-1 is equal to or higher than a preset threshold value , the control unit 18 increases the opening degree of the flow rate control valve V 11-1 and Flow control valve V 12-1At least one of the reductions in the opening degree is controlled. As a result, the flow rate increases as the power generation output increases, and the combustion exhaust gas G 11-1 with reduced nitrogen oxides can be introduced into the integrated exhaust heat recovery boiler 12. The amount of exhaust heat recovered can be increased.
[0042]
　When the flow rate of the combustion exhaust gas G 11-2 flowing through the exhaust gas line L 11-2 measured by the flow rate measurement unit 19 is less than a preset threshold value as the power generation load, the control unit 18 At least one of the reduction of the opening degree of the flow rate control valve V 11-2 and the increase of the opening degree of the flow rate control valve V 12-2 is controlled. As a result, the flow rate decreases as the power generation output decreases, and the combustion exhaust gas G 11-2 with an increased concentration of nitrogen oxides can be discharged as the exhaust combustion exhaust gas G 12-2. The concentration of nitrogen oxides therein can be reduced. As a result, it is possible to reduce the introduction amount of nitrogen oxides in the integrated heat recovery boiler 12, CO 2 CO recovery unit 13 2 can be reduced accumulation of nitrogen oxides due components in the recovery liquid .. When the flow rate of the combustion exhaust gas G 11-2 flowing through the exhaust gas exhaust line L 12-2 becomes equal to or greater than a predetermined threshold value set in advance , the control unit 18 increases the opening degree of the flow rate control valve V 11-2 and Flow control valve V 12-2At least one of the reductions in the opening degree is controlled. As a result, the flow rate increases as the power generation output increases, and the amount of the combustion exhaust gas G 11-2 with the reduced concentration of nitrogen oxides introduced into the integrated exhaust heat recovery boiler 12 can be increased. The amount of exhaust heat recovered in the exhaust heat recovery boiler 12 can be increased.
[0043]
　Further, when the power generation load becomes equal to or lower than a predetermined threshold, the control unit 18 introduces the combustion exhaust gas into the integrated exhaust heat recovery boiler 12 based on the exhaust gas load calculated based on the following formula (1), for example. It is preferable to control the flow rates of G 11-1 and G 11-2 . The rated flow here, normal exhaust gas line L during the operation of the power equipment 10-1 and 10-2 11-1 , L 11-2 combustion exhaust gas G flowing through 11-1 , G 11-2 at a flow rate of is there. Further, exhaust gas line to be measured is an integrated exhaust gas line L 21 and the line where there is a supply of combustion exhaust gas into the.
　Exhaust gas load (%) = the measured exhaust gas line L 11-1 , L 11-2 combustion exhaust gas G flowing through 11-1 , G 11-2 of flow / exhaust gas line L 11-1 , L 11-2 through the Combustion exhaust gas G 11-1 , G 11-2Rated flow rate x 100... Formula (1)
[0044]
　When the exhaust gas load calculated by the above equation (1) becomes less than the set threshold value, the control unit 18 reduces the opening degree of the flow rate control valves V 11-1 and V 11-2 and controls the flow rate. At least one of the increase in the opening degree of the valves V 12-1 and V 12-2 is controlled. As a result, the combustion exhaust gas G 11-1 , G 11-2 in which the concentration of nitrogen oxides has increased as the exhaust gas load decreases can be emitted as the exhaust combustion exhaust gas G 12-1 , G 12-2 . It is possible to reduce the concentration of nitrogen oxides in the integrated combustion exhaust gas G21. As a result, it is possible to reduce the introduction amount of nitrogen oxides in the integrated heat recovery boiler 12, CO 2 CO recovery unit 13 2 can be reduced accumulation of nitrogen oxides due components in the recovery liquid .. When the exhaust gas load calculated by the above equation (1) becomes equal to or larger than a preset threshold value, the control unit 18 increases the opening degree of the flow rate control valves V 11-1 and V 11-2 and the flow rate. Control valves V 12-1 , V 12-2At least one of the reductions in the opening degree is controlled. This makes it possible to increase the introduction amount of the combustion exhaust gas G 11-1 , G 11-2 , whose concentration of nitrogen oxides has decreased with the increase of the exhaust gas load, into the integrated exhaust heat recovery boiler 12, so that the integrated exhaust gas is recovered. The amount of exhaust heat recovered by the heat recovery boiler 12 can be increased.
[0045]
　FIG. 3 is a diagram showing the relationship between the exhaust gas load and the amount of nitrogen oxide-derived components accumulated in the CO 2 absorbing liquid. As shown in FIG. 3, in the exhaust gas treatment device 1, the accumulated amount of nitrogen oxide-derived components in the CO 2 absorbing liquid decreases as the exhaust gas load calculated by the above formula (1) increases . At this exhaust gas load, the amount of nitrogen oxide-derived components accumulated at 60% is about 0.28 times that when the nitrogen oxide removing unit 120 is not provided, and at 70%, the nitrogen oxide removing unit 120 is not provided. It is about 0.17 times the case. Further, in the exhaust gas load, the amount of accumulated nitrogen oxide-derived components is remarkably increased in the range of less than 60%, and the reduction rate of the accumulated amount of nitrogen oxide-derived components is decreased in the range of 70% or more. The reduction rate becomes maximum in the range of less than or equal to %. Further, as the exhaust gas load approaches 100%, the amount of nitrogen oxide-derived components accumulated in the CO 2 absorbing solution decreases. Considering the above, the threshold of the exhaust gas load set in advance is 60% or more from the viewpoint of reducing the operating amount of the exhaust gas treatment apparatus 1 by reducing the amount of nitrogen oxide-derived components accumulated in the CO 2 absorbing liquid. It is preferably 70% or more, more preferably 100% or less.
[0046]
　Further, the control unit 18 adjusts at least one of the flow rates of the combustion exhaust gas G 11-1 , G 11-2 to be introduced into the integrated exhaust heat recovery boiler 12 and the fuel supply amount to the power generation equipment 10 to perform the first exhaust gas measurement. The temperature of the integrated combustion exhaust gas G21 measured by the section 16 is controlled to be 300°C or higher and 400°C or lower. By such control, the exhaust gas treatment device 1 can set the temperature of the integrated combustion exhaust gas G21 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 G21 can be decomposed and removed more efficiently.
[0047]
　When the temperature of the integrated combustion exhaust gas G21 measured by the first exhaust gas measurement unit 16 is less than 300° C., the control unit 18 is connected to the power generation facilities 10-1 and 10-2 in which the exhaust gas load or the power generation output has decreased. and exhaust gas line L 11-1 , L 11-2 flow control valve V of 11-1 , V 11-2 reduces the opening of and the exhaust gas line L 11-1 , L 11-2 gas exhaust line L branching from 12-1 and L 12-2 of the flow rate control valves V 12-1 and V 12-2 by controlling at least one of the increase in the opening degree of the combustion exhaust gases G 11-1 and G 11-2 in the integrated combustion exhaust gas G 21. Reduce the proportion of. As a result, the exhaust gas load in the integrated combustion exhaust gas G21 or the power generation output is decreased, and the temperature of the combustion exhaust gas G 11-1 , G 11-2 is decreased. Since the amount of introduction into the integrated exhaust heat recovery boiler 12 can be reduced, the temperature of the integrated combustion exhaust gas G21 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 12-1 , and V 12-2 , so that the exhaust gas load or the power generation output is reduced. , 10-2 may be increased to raise the temperature of the integrated combustion exhaust gas G21.
[0048]
　Further, when the temperature of the integrated combustion exhaust gas G21 measured by the first exhaust gas measuring unit 16 exceeds 400° C., the control unit 18 connects to the power generation facilities 10-1 and 10-2 having a high exhaust gas load or a high power generation output. has been the exhaust gas line L 11-1 , L 11-2 flow control valve V of 11-1 , V 11-2 reduces the opening of and the exhaust gas line L 11-1 , L 11-2 gas exhaust line branched from The combustion exhaust gases G 11-1 and G 11- in the integrated combustion exhaust gas G21 are controlled by controlling at least one of the increase of the opening degree of the flow rate control valves V 12-1 and V 12-2 of L 12-1 and L 12-2. Decrease the ratio of 2 . Thus, the combustion exhaust gas G and the temperature rose high gas load or power output in the integrated flue gas G21 is 11-1 , G 11-2Since it is possible to reduce the amount of introduction into the integrated exhaust heat recovery boiler 12, the temperature of the integrated combustion exhaust gas G21 measured by the first exhaust gas measurement unit 16 decreases. Further, the control unit 18 maintains the openings of the flow rate control valves V 11-1 , V 11-2 , V 12-1 , and V 12-2 to generate the exhaust gas load or the power generation facility 10-1 having a high power generation output. The temperature of the integrated combustion exhaust gas G21 may be raised by reducing the supply amount of the fuel F to 10-2.
[0049]
　Further, the control unit 18 adjusts the supply amount of the reducing agent supplied from the reducing agent supply unit 121 so that the nitrogen oxide concentration in the integrated combustion exhaust gas G21 measured by the second exhaust gas measurement unit 17 is equal to or lower than a predetermined value. Control to be. The control unit 18 increases the supply amount of the reducing agent from the reducing agent supply unit 121 when the nitrogen oxide concentration in the integrated combustion exhaust gas G21 measured by the second exhaust gas measuring unit 17 exceeds a predetermined value. When the nitrogen oxide concentration in the integrated combustion exhaust gas G21 measured by the second exhaust gas measurement unit 17 is less than the predetermined value, the reducing agent supply amount from the reducing agent supply unit 121 is maintained or reduced. Such control exhaust gas treatment apparatus 1, CO 2 because the nitrogen oxides concentration in the integrated flue gas G21 which is introduced into the recovery unit 13 can be controlled to a predetermined value or less, CO 2 is discharged from the recovery unit 13 CO 2 The nitrogen oxides in the integrated combustion exhaust gas G21 after the recovery can be efficiently reduced.
[0050]
　Next, the overall operation of the exhaust gas treatment device 1 according to the present embodiment will be described. The combustion exhaust gas G 11-1 discharged from the power generation facility 10-1 is supplied to the integrated exhaust gas line L 21 via the exhaust gas line L 11-1 . Here, at least a part of the power generation output of the power generation equipment 10-1 and the exhaust gas load and the flow rate of the combustion exhaust gas G 11-1 flowing through the exhaust gas line L 11-1 are decreased, and the nitrogen oxidation in the combustion exhaust gas G 11-1 is performed. When the concentration of the substance increases , at least a part of the combustion exhaust gas G 11-1 branches into the exhaust gas exhaust line L 12-1 and flows as the exhaust combustion exhaust gas G 12-1 . The exhaust combustion exhaust gas G 12-1 flowing through the exhaust gas exhaust line L 12-1 is supplied to the integrated exhaust gas exhaust line L 31 after the exhaust heat is recovered by the exhaust exhaust heat recovery boiler 11 . Further, the combustion exhaust gas G 11-2 emitted from the power generation equipment 10-2 is integrated with the integrated exhaust gas line L 11 through the exhaust gas line L 11-2.21 . Here, at least a part of the power generation output of the power generation equipment 10-2, the exhaust gas load, and the flow rate of the combustion exhaust gas G 11-2 flowing through the exhaust gas line L 11-2 decreases, and the nitrogen oxidation in the combustion exhaust gas G 11-2 occurs. When the concentration of the substance increases , at least a part of the combustion exhaust gas G 11-2 branches into the exhaust gas exhaust line L 12-2 and flows as the exhaust combustion exhaust gas G 12-2 . The exhaust combustion exhaust gas G 12-2 flowing through the exhaust gas exhaust line L 12-2 is supplied to the integrated exhaust gas exhaust line L 31 . The exhaust combustion exhaust gas G 12-1 , G 12-2 supplied to the integrated exhaust gas exhaust line L 31 is integrated with the integrated exhaust combustion exhaust gas G 31 and discharged from the chimney 15.
[0051]
　The combustion exhaust gases G 11-1 and G 11-2 supplied to the integrated exhaust gas line L 21 are integrated and supplied to the integrated exhaust heat recovery boiler 12 as integrated combustion exhaust gas G21. Here, the control unit 18 controls the valve opening degree of the flow rate control valve V 11-1 and the flow rate control valve V 11-2 , and the supply amount of the fuel supplied to the power generation facility 10, as necessary. Thus, the temperature of the integrated combustion exhaust gas G21 is controlled to be a predetermined temperature (for example, 300° C. or higher and 400° C. or lower). In the integrated combustion exhaust gas G21 supplied to the integrated exhaust heat recovery boiler 12, after 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. , CO 2 recovery unit 13. Here, the control unit 18 controls the reducing agent supply unit 121 to reduce the amount of nitrogen oxides in the integrated combustion exhaust gas G21 supplied to the CO 2 recovery unit 13 to a predetermined value or less. Control the amount of reducing agent supplied to the. The integrated combustion exhaust gas G21 supplied to the CO 2 recovery unit 13 is discharged to the outside of the exhaust gas treatment device 1 after CO 2 is recovered by the CO 2 absorbing liquid . CO 2The CO 2 in the integrated combustion exhaust gas G21 recovered by the absorbing liquid is released from the CO 2 absorbing liquid by heating, and then supplied to the CO 2 compressing section 14 where it is compressed and discharged.
[0052]
　As described above, according to the above-described embodiment, when the nitrogen oxides in the combustion exhaust gas G 11-1 , G 11-2 emitted from at least one of the power generation facilities 10-1 and 10-2 increases. In addition, at least one of the combustion exhaust gas G 11-1 and G 11-2 having an increased concentration of nitrogen oxides can be discharged to the outside through at least one of the exhaust gas exhaust lines L 12-1 and L 12-2. It will be possible. As a result, the exhaust gas treatment device 1 can adjust the concentration of nitrogen oxides in the integrated combustion exhaust gas G21 introduced into the nitrogen oxide removing unit 120 to a concentration range suitable for the decomposition treatment of nitrogen oxides. It is possible to efficiently decompose and remove nitrogen oxides in the integrated combustion exhaust gas G21. Therefore, it is possible to reduce the amount of nitrogen oxide-derived components accumulated in the CO 2 absorbent and reduce the operating cost.
[0053]
　In the above-described embodiment, the configuration in which the exhaust gas exhaust heat recovery boiler 11 is provided in the integrated exhaust gas exhaust line L 31 has been described. The exhaust gas exhaust line L 12-1 may be provided, the exhaust gas exhaust line L 12-2 may be provided, or both the exhaust gas exhaust lines L 12-1 and L 12-2 may be provided. The exhaust heat recovery steam generator 11 does not necessarily have to be provided.
[0054]
　Further, in the embodiment described above, the exhaust gas line L 11-1 , L 11-2 respectively gas exhaust line L to 12-1 , L 12-2 has been described an example of providing a gas exhaust line L 12-1 , At least one of L 12-2 may be provided. In this case, depending on the performance of the power generation facilities 10-1 and 10-2, for example, the exhaust gas exhaust line L 12-1 is connected to the exhaust gas line L 11-1 of the power generation facility 10-1 under the operating condition where the power generation output is likely to decrease. On the other hand, the exhaust gas line L 11-2 of the power generation facility 10-2 in which the power generation output is unlikely to decrease may not be provided with the exhaust gas exhaust line L 12-2 . Thereby, even if only the power generation output of the power generation equipment 10-1 is reduced and the concentration of nitrogen oxides in the combustion exhaust gas G 11-1 is increased, the amount of nitrogen oxides in the integrated combustion exhaust gas G21 is reduced. You can Further, the power generation facilities 10-1 and 10-2 may be existing power generation facilities or newly installed power generation facilities. When the power generation facilities 10-1 and 10-2 are existing power generation facilities, it is sufficient to provide an exhaust gas exhaust line with respect to the existing exhaust gas line.
[0055]
　Further, the configuration of the integrated exhaust heat recovery boiler 12 in the above-described embodiment can be changed as appropriate. FIG. 5 is a schematic diagram showing another example of the exhaust gas treating apparatus 1 according to the above embodiment. In the exhaust gas treatment device 3 shown in FIG. 5, 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. The steam generating unit 123 is provided with a turbine driving steam generating unit 123A provided at a subsequent stage of the nitrogen oxide removing unit 120 in the flow direction of the integrated combustion exhaust gas G21 and a CO 2 provided at a subsequent stage of the turbine driving steam generating unit 123A. The steam generator 123B for driving the compressor is provided.
[0056]
　The turbine driving steam generation unit 123A recovers exhaust heat of the integrated combustion exhaust gas G21 from which nitrogen oxides have been removed, and generates turbine driving steam S 1 that is low-pressure steam that drives the low-pressure steam turbine 21 . Further, 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 21. The low-pressure steam turbine 21 may be provided outside the exhaust gas treatment device 3, or may be the low-pressure steam turbine 221 of the power generation facility 10 shown in FIG. The low-pressure steam turbine 21 is rotationally driven by the turbine-driving steam S 1 to generate electricity by a generator (not shown). As a result, the exhaust gas treatment device 3 can generate electric power by the exhaust heat of the integrated combustion exhaust gas G21 recovered by the integrated exhaust heat recovery boiler 12, so that the steam required for driving the low pressure steam turbine 21 can be reduced. .. Further, low-pressure steam turbine 21, 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.
[0057]
　The CO 2 compression unit driving vapor generation unit 123B is a low-pressure vapor that drives the CO 2 compression unit 14 by recovering exhaust heat of the integrated combustion exhaust gas G21 from which nitrogen oxides have been removed , and is a CO 2 compression unit driving vapor S. 3 is generated. 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 to drive the compressor CO 2 compressing. As a result, the exhaust gas treatment device 3 can perform compression of CO 2 by the exhaust heat of the integrated combustion exhaust gas G21 recovered by the integrated exhaust heat recovery boiler 12, so that the steam required for the compression of CO 2 can be reduced. it can. In addition, CO 2Compression unit 14, steam discharge line L 15 CO through 2 CO after the compressor drive 2 compression unit driving the steam S 3 the CO 2 absorbing solution regeneration steam S 4 CO as 2 supplies the recovery unit 13.
[0058]
　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. As a result, the exhaust gas treatment device 3 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.
[0059]
　The control unit 18 supplies the amount of fuel supplied to the combustor of the power generation facility 10 based on the temperature and the gas flow rate of the integrated combustion exhaust gas G21 introduced into the nitrogen oxide removal unit 120 measured by the first exhaust gas measurement unit 16. , The supply amount of the turbine driving steam S 1 supplied to the low-pressure steam turbine 21 and the supply amount of the CO 2 compression unit driving steam S 3 supplied to the CO 2 compression unit 14 . The control unit 18 increases 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 G21 introduced into the nitrogen oxide removal unit 120 are less than the predetermined range. Further, when the temperature and the gas flow rate of the integrated combustion exhaust gas G21 introduced into the nitrogen oxide removing unit 120 exceed a predetermined range, the control unit 18 reduces the fuel F supplied to the combustor 212 of the power generation equipment. The control unit 18, when the temperature and the gas flow integrated combustion exhaust gas G21 introduced into the nitrogen oxide removing portion 120 is less than the predetermined range, the steam supply line L 12 flow control valve V provided in the 12 and steam supply line L 14 flow control valve V provided in 14 by reducing at least one of the opening degree of the turbine driving steam S is supplied to the low pressure steam turbine 21 1 and CO 2 CO is supplied to the compression unit 14 2At least one of the supply amounts of the compression unit driving steam S 3 is reduced. The control unit 18, when the temperature and the gas flow integrated combustion exhaust gas G21 introduced into the nitrogen oxide removing portion 120 is greater than the predetermined range, the steam supply line L 12 flow control valve V provided in the 12 and steam supply line L 14 flow control valve V provided in the 14 to increase at least one of the opening degree of the turbine driving steam S is supplied to the low pressure steam turbine 21 1 and CO 2 CO is supplied to the compression unit 14 2 At least one of the supply amounts of the compression unit driving steam S 3 is increased. By such control, the temperature of the integrated combustion exhaust gas G21 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 can be efficiently reduced. can do.
[0060]
　As described above, according to the exhaust gas treatment device 3 of the above-described embodiment , the low-pressure steam turbine 21 can be operated by the turbine driving steam generating unit 123A and the CO 2 compression unit driving steam generating unit 123B of the integrated exhaust heat recovery boiler 12 . 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 3 as a whole can be reduced.
[0061]
　Further, in the exhaust gas treatment device 1 shown in FIG. 1, an example in which the exhaust gas treatment device 1 processes the combustion exhaust gas G 11-1 , G 11-2 of the two power generation facilities 10-1, 10-2 has been described. The second power generation facility and the second exhaust gas passage may be plural in number, and it is also possible to process combustion exhaust gas from a larger number of power generation facilities. FIG. 6 is a schematic diagram showing another example of the exhaust gas treatment device 1 according to the present embodiment. As shown in FIG. 6, the exhaust gas treatment device 4 includes combustion exhaust gas G 11-1 , G 11- discharged from the five power generation facilities 10-1, 10-2, 10-3, 10-4 , 10-5. After the exhaust heat of 2 , G 11-3 , G 11-4 , and G 11-5 is recovered by the integrated exhaust heat recovery boiler 12, combustion exhaust gas G 11-1 , G 11-2 , G 11-3 , G 11 -4 , CO 2 contained in G 11-5 is recovered by the CO 2 recovery unit 13. The exhaust gas treatment device 4 is a combustion exhaust gas G 11-1.And power generation equipment 10-1 for discharging the combustion exhaust gas G to 11-2 and power generation equipment 10-2 for discharging the combustion exhaust gas G 11-3 and power generation equipment 10-3 for discharging the combustion exhaust gas G 11-4 discharges Installed in the latter stage of the power generation equipment 10-4, the power generation equipment 10-5 for discharging the combustion exhaust gas G 11-5 , and the power generation equipment 10-1, 10-2, 10-3, 10-4, 10-5. 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 .
[0062]
　The power generation facilities 10-3, 10-4, 10-5 discharge the combustion exhaust gas G 11-3 generated by power generation to the exhaust gas lines L 11-3 , L 11-4 , L 11-5 , respectively. The exhaust gas lines L 11-3 , L 11-4 , and L 11-5 are combustion exhaust gases G 11-3 , G 11-4 , and G 11- , which are discharged from the power generation equipments 10-3, 10-4, and 10-5. 5 are supplied to the integrated exhaust heat recovery boiler 12, respectively. Exhaust gas line L 11-3 , L 11-4 , L 11-5 , the exhaust gas line L 11-3 , L 11-4 , L 11-5 combustion exhaust gas G flowing through 11-3 , G 11-4 , G 11-5 flow control valve V for adjusting the flow rate of 11-3 , V 11-4 , V 11-5 , respectively. Further, in the exhaust gas lines L 11-3 , L 11-4 , L 11-5 , the flow rate control valve V 11 between the power generation facilities 10-3, 10-4, 10-5 and the integrated exhaust heat recovery boiler 12 is provided. -3 , V 11-4 , V 11-5 , exhaust gas exhaust lines L 11-3 , L 11-4 , L 11-5 branching after the exhaust gas lines L 12-3 , L 12-4 , L 12 respectively. -5 is provided. The exhaust gas exhaust lines L 12-3 , L 12-4 and L 12-5 have a flow rate control valve V 12-3 , V 12-4 , V 12-5 , an exhaust heat recovery steam generator 11 and a chimney 15 are provided in this order. The flow rate control valves V 12-3 , V 12-4 , V 12-5 are used for the exhaust combustion exhaust gas G 12-3 , G 12-4 flowing through the exhaust gas exhaust lines L 12-3 , L 12-4 , L 12-5. , G 12-5 flow rates are adjusted. The exhaust heat recovery boiler 11 recovers the exhaust heat of the exhaust combustion exhaust gas G 12-3 , G 12-4 , G 12-5 flowing through the exhaust gas exhaust lines L 12-3 , L 12-4 , L 12-5 , respectively. Exhausted combustion exhaust gas G 12-3 , G that recovers the exhaust heat 12-4 and G 12-5 are supplied to the chimney 15, respectively. The chimney 15 discharges the exhaust combustion exhaust gas G 12-3 , G 12-4 , G 12-5 from which the exhaust heat is recovered to the outside. The exhaust heat recovery steam generator 11 does not necessarily have to be provided.
[0063]
　In the integrated exhaust heat recovery boiler 12, 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 G21 in which 11-3 , G 11-4 , and G 11-5 are integrated is supplied. The integrated exhaust heat recovery boiler 12 recovers the exhaust heat of the integrated combustion exhaust gas G21.
[0064]
　In addition, the exhaust gas treatment device 4 includes the flow rates of the combustion exhaust gas G 11-1 , G 11-2 , G 11-3 , G 11-4 , and G 11-5 introduced into the integrated exhaust heat recovery boiler 12 , the power generation facility 10- 1, 10-2, 10-3, 10-4, 10-5 and a control unit for controlling the supply amount of the reducing agent supplied from the reducing agent supply unit 121 into the integrated combustion exhaust gas G21. 18 and the combustion exhaust gas G 11-1 , G 11-2 , G 11-3 , G 11 flowing through the exhaust gas lines L 11-1 , L 11-2 , L 11-3 , L 11-4 , L 11-5 -4 , G 11-5 flow rate and exhaust gas exhaust line L 12-1 , L 12-2 , L 12-3, L 12-4 , L 12-5, and a flow rate measurement unit 19 for measuring the flow rates of exhaust combustion exhaust gas G 12-1 , G 12-2 , G 12-3 , G 12-4 , G 12-5 . The power generation equipment 10-1, 10-2, 10-3, 10-4, 10-5 is provided with an output measurement unit 20 for measuring the power generation output. Gas flow rate and temperature measurement in the first exhaust gas measurement unit 16, gas flow rate and nitrogen oxide concentration measurement in the second exhaust gas measurement unit 17, combustion exhaust gas G 11-1 , G 11-2 , G 11 in the flow rate measurement unit 19 -3 , G 11-4 , G 11-5 and exhaust combustion exhaust gas G 12-1 , G 12-2 , G 12-3 , G 12-4 , G 12-5The measurement of the flow rate and the generation output of the power generation equipment 10-1, 10-2, 10-3, 10-4, 10-5 in the output measurement unit 20 are performed by a conventionally known method.
[0065]
　The control unit 18 controls the flow rate control valves V 11-1 , V 11-2 , V 11-3 , V 11-4 based on the gas flow rate and the temperature of the integrated combustion exhaust gas G21 measured by the first exhaust gas measurement unit 16. , V 11-5 , V 12-1 , V 12-2 , V 12-3 , V 12-4 , V 12-5 opening and power generation equipment 10-1, 10-2, 10-3, 10- Adjust the amount of fuel supply to 4, 10-5. Further, the control unit 18 controls the exhaust gas lines L 11-1 , L 11-2 , L 11-3 , L 11-4 , L 11-5 and the exhaust gas exhaust lines L 12-1 , L 12-2 , L 12-. 3 , L 12-4, L 12-5 , the flow rate of combustion exhaust gas G 11-1 , G 11-2 , G 11-3 , G 11-4 , G 11-5 and the power generation facilities 10-1, 10-2, 10-3, Combustion exhaust gas G 11-1 , G 11-2 , G 11-3 , G 11-4 , G introduced into the integrated exhaust heat recovery boiler 12 based on at least one of the power generation outputs of 10-4 and 10-5. Control the flow rate of 11-5 . Further, the control unit 18 controls the power generation equipment 10-1, 10-2, 10-3, 10-4 based on the gas flow rate and the nitrogen oxide concentration of the integrated combustion exhaust gas G21 measured by the second exhaust gas measurement unit 17. , 10-5 to control the amount of fuel F supplied. The specific control of each unit by the control unit 18 and other configurations are the same as 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. Combustion exhaust gas G 11-1 , G 11-2 , G 11-3 , G 11-4 , G 11- discharged from the power generation facilities 10-1, 10-2, 10-3 , 10-4 , 10-5. 5 is supplied to the integrated exhaust gas line L 21 via the exhaust gas lines L 11-1 , L 11-2 , L 11-3 , L 11-4 and L 11-5 . Here, at least a part of the power generation load of the power generation equipment 10-1, 10-2, 10-3, 10-4, 10-5 is reduced, and the concentration of nitrogen oxides in the combustion exhaust gas G 11-1 is reduced. When it increases, the combustion exhaust gas G 11-1 , G 11-2 , G 11-3 , G 11-4 , G 11-5At least a part of this flows into the exhaust gas exhaust lines L 12-1 , L 12-2 , L 12-3 , L 12-4 , L 12-5 in a branched manner. Exhaust Gas Exhaust Lines L 12-1 , L 12-2 , L 12-3 , L 12-4 , L 12-5 Combustion Exhaust Gas G 11-1 , G 11-2 , G 11-3 , G 11-4 , G 11-5 are supplied to the integrated exhaust gas exhaust line L 31 after exhaust heat is recovered by the exhaust gas exhaust heat recovery boiler 11 . Combustion exhaust gas G 11-1 , G 11-2 , G 11-3 supplied to the integrated exhaust gas exhaust line L 31, G 11-4 , G 11-5 are integrated with the integrated combustion exhaust gas G 21 and discharged from the chimney 15.
[0067]
　The combustion exhaust gas G 11-1 , G 11-2 , G 11-3 , G 11-4 , and G 11-5 supplied to the integrated exhaust gas line L 21 are integrated to form an integrated combustion exhaust gas G 21 and integrated exhaust heat recovery. It is supplied to the boiler 12. Here, if necessary, the control unit 18 causes the flow control valves V 11-1 , V 11-2 , V 11-3 , V 11-4 , and V 11-5 to open and the power generation equipment 10-1. , 10-2, 10-3, 10-4, 10-5 by controlling the supply amount of the fuel F supplied, the temperature of the integrated combustion exhaust gas G21 is a predetermined temperature (for example, 300 ℃ or more 400 ℃ or less) Control so that. In the integrated combustion exhaust gas G21 supplied to the integrated exhaust heat recovery boiler 12, after 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. , CO 2 recovery unit 13. Here, the control unit 18 controls the CO 2The amount of the reducing agent supplied from the reducing agent supply unit 121 into the integrated combustion exhaust gas G21 is controlled so that the nitrogen oxides in the integrated combustion exhaust gas G21 supplied to the recovery unit 13 are equal to or less than a predetermined value. The integrated combustion exhaust gas G21 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 CO integrated combustion exhaust gas G21 recovered by absorption liquid 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.
[0068]
　As described above, according to the above embodiment, the combustion exhaust gas G 11-1 , which is emitted from at least one of the power generation equipments 10-1, 10-2, 10-3, 10-4, 10-5 , When the nitrogen oxides in G 11-2 , G 11-3 , G 11-4 , and G 11-5 increase, the exhaust gas exhaust lines L 12-1 , L 12-2 , L 12-3 , L 12 -4 , L 12-5 via at least one of the combustion exhaust gas G concentration was increased nitrogen oxides 11-1 , G 11-2 , G 11-3 , G 11-4 , G 11-5 least One is exhaust combustion exhaust gas G 12-1 , G 12-2 , G 12-3 , G 12-4 and G 12-5 can be discharged to the outside. As a result, the exhaust gas treatment device 4 can adjust the concentration of nitrogen oxides in the integrated combustion exhaust gas G21 introduced into the nitrogen oxide removing unit 120 to a concentration range suitable for the decomposition treatment of nitrogen oxides. It is possible to efficiently decompose and remove nitrogen oxides in the integrated combustion exhaust gas G21. Therefore, it is possible to reduce the amount of nitrogen oxide-derived components accumulated in the CO 2 absorbent and reduce the operating cost, thereby realizing the exhaust gas treatment device 4. Moreover, for example, when the two power generation facilities 10-1 and 10-2 are existing power generation facilities, the structure of the exhaust gas treatment device 4 can be obtained by simply installing new power generation facilities 10-3, 10-4, and 10-5. can do. In this case, when the power generation load and the exhaust gas load of the existing two power generation facilities 10-1 and 10-2 tend to decrease with respect to the three newly-generated power generation facilities 10-3, 10-4, and 10-5, However , it is not always necessary to provide the exhaust gas exhaust lines L 12-3 , L 12-4 , L 12-5, and it is only necessary to provide the exhaust gas exhaust lines L 12-1 and L 12-2 and the nitrogen oxidation in the integrated combustion exhaust gas G21 is performed. The concentration of the substance can also be adjusted to a concentration range suitable for the decomposition treatment of nitrogen oxides. As described above, according to the exhaust gas treatment device 4, among the plurality of power generation facilities 10-1, 10-2, 10-3, 10-4, 10-5, the power generation load and the exhaust gas load that are likely to decrease are exhaust gas. Exhaust line L 12-1, L 12-2 , L 12-3 , L 12-4 , L 12-5 are provided and exhaust combustion exhaust gas G 12-1 , G 12-2 , G 12-3 , G 12-4 , G 12-5 is provided. By operating while changing the flow rate of NOx, it is possible to reduce the amount of nitrogen oxide-derived components accumulated in the CO 2 absorbing liquid and realize the exhaust gas treatment device 4 capable of reducing operating costs.
[0069]
(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.
[0070]
　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 accumulated amount of nitrogen oxide-derived components (see Examples) when the exhaust gas lines L 11-1 and L 11-2 are provided by the exhaust gas treatment apparatus 1 according to the above embodiment, and the exhaust gas line The amount of accumulated nitrogen oxide-derived components (see Comparative Example) when L 11-1 and L 11-2 are not provided is shown in comparison. As shown in FIG. 7, by providing the exhaust gas lines L 11-1 and L 11-2 , it is possible to reduce the amount of nitrogen oxide-derived components accumulated in the CO 2 absorbing solution by about 0.5 times. .. From this result, according to the exhaust gas treatment device 1 according to 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
[0071]
　1, 2, 3, 4 Exhaust gas treatment device
　10, 10-1, 10-2, 10-3, 10-4, 10-5 Power generation equipment
　11 Exhaust gas exhaust heat recovery boiler
　12 Integrated exhaust heat recovery boiler
　13 CO 2 recovery unit
　14 CO 2 Compression Section
　15 Chimney
　16 First Exhaust 　Gas Measurement Section
　17 Second Exhaust Gas Measurement Section
　18 Control Section
　19 Flow Rate Measurement Section
　20 Output Measurement Section
　21 Low Pressure Steam Turbine
210 Gas Turbine
　211 Compressor
　212 Combustor
　213 Turbine
　221 Low Pressure Steam Turbine
　222 Medium pressure/high pressure steam turbine
　222A Medium
　pressure steam turbine 222B High pressure steam turbine
　230 Generator
　240 Turbine shaft
　A Air
　F Fuel
　G 11-1 , G 11-2 , G 11-3 , G 11-4 , G 11-5　Combustion exhaust gas
　G 12-1 , G 12-2 , G 12-3 , G 12-4 , G 12-5　Exhaust combustion exhaust gas
　G 21　Integrated combustion exhaust gas
　G 31　Integrated exhaust combustion exhaust gas
　L 11-1 , L 11-2 , L 11-3 , L 11-4 , L 11-5　Exhaust gas line
　L 12-1 , L 12-2, L 12-3 , L 12-4 , L 12-5　Exhaust gas exhaust line
　L 21　Integrated exhaust gas line
　L 31　Integrated exhaust gas exhaust line
　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 in which a first combustion exhaust gas discharged from a first power generation facility flows, a second exhaust gas flow path in which a
　second combustion exhaust gas discharged from a second power generation facility flows,
　the first exhaust gas flow path, and the above At least a part of at least one of the first combustion exhaust gas flowing in the first exhaust gas flow passage and the second combustion exhaust gas flowing in the second exhaust gas flow passage is provided so as to branch from at least one of the second exhaust gas flow passages. Exhaust gas discharged as exhaust combustion exhaust
　gas, nitrogen oxide in integrated combustion exhaust gas that integrates the first combustion exhaust gas flowing through the first exhaust gas flow passage and the second combustion exhaust gas flowing through the second exhaust gas flow passage a nitrogen oxide removal unit that removes,
　with integrated heat recovery unit for recovering exhaust heat of the integrated combustion exhaust gas to remove nitrogen oxides in the nitrogen oxide removal unit,
　waste heat recovery in the integrated heat recovery unit An exhaust gas treatment apparatus, comprising: a CO 2 recovery unit that recovers CO 2 in the integrated combustion exhaust gas that has been recovered by a CO 2 recovery liquid .
[Claim 2]
　The exhaust gas treatment apparatus according to claim 1, further comprising an exhaust heat recovery unit that recovers exhaust heat of exhaust combustion exhaust gas flowing through the exhaust gas exhaust passage.
[Claim 3]
　The exhaust gas treatment apparatus according to claim 1 or 2, further comprising a control unit that controls a flow rate of the first combustion exhaust gas and the second combustion exhaust gas that are introduced into the integrated exhaust heat recovery unit.
[Claim 4]
　The control unit controls the flow rates of the first combustion exhaust gas and the second combustion exhaust gas to be introduced into the integrated exhaust heat recovery unit, based on the power generation loads of the first power generation facility and the second power generation facility, Item 3. The exhaust gas treatment device according to item 3.
[Claim 5]
　The control unit, as the power generation load, the flow rates of the first combustion exhaust gas and the second combustion exhaust gas to be introduced into the integrated exhaust heat recovery unit based on the power generation outputs of the first power generation facility and the second power generation facility. The exhaust gas treatment apparatus according to claim 4, which controls the exhaust gas.
[Claim 6]
　The control unit, as the power generation load, the flow rate of the first combustion exhaust gas flowing through the first exhaust gas flow path, the flow rate of the second combustion exhaust gas flowing through the second exhaust gas flow path, and the exhaust gas exhaust flow path. The exhaust gas treatment apparatus according to claim 4, wherein the flow rates of the first combustion exhaust gas and the second combustion exhaust gas introduced into the integrated exhaust heat recovery unit are controlled based on at least one of the flow rates of the exhaust combustion exhaust gas.
[Claim 7]
　The control unit introduces the first combustion exhaust gas into the integrated exhaust heat recovery unit based on the exhaust gas load calculated based on the following equation (1) when the power generation load becomes equal to or lower than a predetermined threshold value. And the exhaust gas treatment device according to any one of claims 4 to 6, which controls the flow rate of the second combustion exhaust gas.
　Exhaust gas load (%)=flow rate of first combustion exhaust gas or second combustion exhaust gas flowing through first exhaust gas flow path or second exhaust gas flow path to be measured/first flow through first exhaust gas flow path or second exhaust gas flow path Rated flow rate of flue gas or second flue gas x 100... Formula (1)
[Claim 8]
　A control unit is provided that adjusts the flow rates of the first combustion exhaust gas and the second combustion exhaust gas introduced into the nitrogen oxide removal unit and controls the temperature of the integrated combustion exhaust gas to 300° C. or higher and 400° C. or lower. The exhaust gas treating apparatus according to any one of claims 1 to 7.
[Claim 9]
　The exhaust gas treating apparatus according to claim 1, wherein the nitrogen oxide removing unit is provided in the integrated exhaust heat recovery unit.
[Claim 10]
　The exhaust gas according to any one of claims 1 to 9, wherein the nitrogen oxide removal unit includes a nitrogen oxide removal catalyst that removes nitrogen oxides and a reducing agent injection unit that injects a reducing agent. Processing equipment.
[Claim 11]
The exhaust gas treatment apparatus according to claim 10, further comprising 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.
[Claim 12]
　The integrated exhaust heat recovery unit 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 , and the generated CO 2 a compression unit driving steam CO 2 supplied to the compression unit, the exhaust gas treatment apparatus according to any one of claims 1 to 11.
[Claim 13]
　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. 12. The exhaust gas treatment device according to any one of 12.
[Claim 14]
　The temperature and the gas flow rate of the integrated combustion exhaust gas introduced into the nitrogen oxide removing unit are measured, and the integrated combustion exhaust gas is supplied to the combustors of the first power generation facility and the second power generation facility based on the measured temperature and gas flow rate. The exhaust gas treatment apparatus according to claim 13, further comprising a control unit that controls at least one of an amount of fuel and an amount of steam supplied to the steam turbine.
[Claim 15]
　The exhaust gas treatment device according to any one of claims 1 to 14, wherein at least one of the first power generation facility and the second power generation facility includes an existing power generation facility.
[Claim 16]
　When the power generation load of at least one of the first power generation facility and the second power generation facility becomes less than a predetermined threshold value, the first combustion exhaust gas discharged from the first power generation facility having the power generation load lower than the predetermined threshold value and A combustion exhaust gas discharge step of discharging at least a part of the second combustion exhaust gas discharged from the second power generation facility to the outside, and
　the first combustion exhaust gas and the first exhaust gas of which at least a part is discharged to the outside in the combustion exhaust gas discharge step. 2
　Nitrogen oxide removal step of integrating the combustion exhaust gas to remove nitrogen oxides in the integrated combustion exhaust gas, and integrated exhaust gas recovery of exhaust heat of the integrated combustion exhaust gas from which nitrogen oxides are removed in the nitrogen oxide removal step and the heat recovery process,
　CO of the integrated heat recovery step the integrated combustion flue gas waste heat is recovered by 2 the CO 2 CO is recovered by the recovery liquid 2 , characterized in that it comprises a recovery step, the exhaust gas treatment Method.