Title of the invention: Combined cycle equipment and its operation method
Technical field
[0001]
　The present invention relates to a combined cycle power generation facility (combined cycle power generation facility: C / C) and its operation method, and in particular, applies a gas turbine using high-humidity air that humidifies by adding moisture to combustion air. The present invention relates to a combined cycle power generation facility suitable for the above and its operation method.
Background technology
[0002]
　In a combined power generation facility, a gas turbine is combined with a steam turbine and an exhaust heat recovery boiler, and the exhaust heat generated from the gas turbine is used to generate steam in the exhaust heat recovery boiler, and the steam is supplied to the steam turbine to generate power. (See Patent Document 1).
[0003]
　An example of the configuration of this combined cycle facility will be described with reference to FIG.
[0004]
　As shown in FIG. 1, the combined cycle power generation facility is roughly composed of a gas turbine 3, a steam turbine 9, and an exhaust heat recovery steam generator 5.
[0005]
　The gas turbine 3 includes a combustor 2 and a compressor 1, increases the pressure of the air sucked by the compressor 1, and adds gas turbine fuel gas to the high-pressure air to generate combustion gas in the combustor 2, which is generated. The gas turbine 3 is driven by using the combustion gas as a driving gas.
[0006]
　At this time, a technique for increasing the output of the gas turbine 3 by adding water to the compressed air compressed by the compressor 1 to increase the flow rate of the working fluid supplied to the combustor 2 is high humidity. It is a gas turbine system for partial use.
[0007]
　On the other hand, the exhaust heat recovery boiler 5 exchanges heat between the exhaust gas from the gas turbine 3 and the water supplied from the low-pressure water supply pump 12 to generate the driving steam of the steam turbine 9. Further, the exhaust heat recovery boiler 5 is a low pressure system composed of a high pressure economizer, a high pressure economizer, and a superheater that generate steam having different pressure levels, and a low pressure system composed of a low pressure economizer and a low pressure evaporator. It consists of a system.
[0008]
　Further, the water supplied to the high-pressure drum 7 and the low-pressure drum 6 becomes saturated steam in the high-pressure evaporator and the low-pressure evaporator. The high-pressure saturated steam is heated by a superheater to become high-pressure steam. The high-pressure steam and low-pressure steam are supplied to the steam turbine 9 as driving steam.
[0009]
　Next, a system for supplying steam to the steam turbine 9 will be described.
[0010]
　First, the water supplied to the high-pressure economizer of the exhaust heat recovery boiler 5 exchanges heat with the exhaust gas from the gas turbine 3 in the high-pressure economizer, and becomes saturated steam in the high-pressure drum 7 and the high-pressure evaporator. .. The saturated steam is heated by a superheater to become superheated steam, which is supplied to the steam turbine 9 as high-pressure steam.
[0011]
　Further, the water supplied to the low-pressure economizer of the exhaust heat recovery boiler 5 exchanges heat with the exhaust gas from the gas turbine 3 at the low-pressure economizer, and becomes saturated steam at the low-pressure drum 6 and the low-pressure evaporator. .. The saturated steam is supplied to the steam turbine 9 as low-pressure steam. The exhaust gas of the steam turbine 9 is discharged to the condenser 11.
[0012]
　In FIG. 1, 4 is a gas turbine generator, 8 is a high-pressure water supply pump, 10 is a steam turbine generator, 13 is a ground steam condenser, and 14 is an exhaust tower that exhausts exhaust gas.
Prior art literature
Patent documents
[0013]
Patent Document 1: Japanese Unexamined Patent Publication No. 10-306708
Outline of the invention
Problems to be solved by the invention
[0014]
　However, in the conventional combined power generation equipment, after the gas turbine 3 is started, the metal matching of the steam turbine 9 which is a bottoming equipment (the temperature change width and the temperature change rate due to the thermal stress limitation of the metal temperature of the steam turbine 9 and the aeration steam temperature difference). From the viewpoint of (restriction), there are restrictions on the acceleration rate and load change rate of the gas turbine 3, and it takes about 50 minutes after ignition of the gas turbine 3 to reach the rated load as a combined power generation facility even with hot start, which is a considerable time. Was required.
[0015]
　Further, the partial load performance (power generation end efficiency) of the combined power generation facility at the start of the gas turbine 3 depends on the steam flow rate characteristic depending on the load of the gas turbine 3 (depends on the exhaust gas temperature characteristic), and the load rises sharply. The rate of increase in efficiency was also limited because it was not possible.
[0016]
　The present invention has been made in view of the above points, and an object of the present invention is to shorten the start-up time of combined cycle equipment (time to reach the rated load) by applying a gas turbine using high-humidity air. The purpose is to provide combined cycle equipment and its operation method that enable highly efficient operation at startup.
Means to solve problems
[0017]
　In order to achieve the above object, the combined power generation facility of the present invention is driven by a gas turbine, an exhaust heat recovery boiler that generates steam using the exhaust gas of the gas turbine as a heat source, and steam generated by the exhaust heat recovery boiler. A combined power generation facility to which a high-humidity combustion gas turbine configured to inject steam generated in the exhaust heat recovery boiler into a combustor is applied as the gas turbine. A control device for controlling the amount of steam generated in the heat recovery boiler injected into the high-humidity combustion gas turbine via the combustor is provided, and the exhaust heat recovery boiler is used when the high-humidity combustion gas turbine is started. The control device controls the amount of generated steam to be injected into the high-humidity combustion gas turbine, and the total amount of steam generated by the exhaust heat recovery boiler is injected into the high-humidity combustion gas turbine via the combustor. It is characterized by starting up.
[0018]
　Further, in order to achieve the above object, the method of operating the combined power generation facility of the present invention generates a gas turbine, an exhaust heat recovery boiler that generates steam using the exhaust gas of the gas turbine as a heat source, and the exhaust heat recovery boiler. A combined power generation facility to which a high-humidity combustion gas turbine configured to inject the steam generated by the exhaust heat recovery steam generator into a combustor is provided as the gas turbine, which is provided with a steam turbine driven by the steam. It is an operation method that, when the high-humidity combustion gas turbine is started, the entire amount of steam generated in the exhaust heat recovery boiler is injected into the high-humidity combustion gas turbine via the combustor and started. It is a feature.
Effect of the invention
[0019]
　According to the present invention, by applying a gas turbine using high-humidity air, it is possible to shorten the start-up time of the combined cycle equipment (shorten the time to reach the rated load) and to operate it with high efficiency at the time of start-up. Can be done.
A brief description of the drawing
[0020]
[Fig. 1] Fig. 1 is a schematic configuration diagram showing a conventional combined cycle power generation facility.
FIG. 2 is a schematic configuration diagram showing Example 1 of the combined cycle power generation facility of the present invention.
FIG. 3 is a diagram showing a start-up operation procedure of the combined cycle equipment when the high-humidity combustion gas turbine according to the first embodiment of the combined cycle equipment of the present invention is applied.
FIG. 4 is a characteristic diagram showing a comparison between the start-up characteristics when the high-humidity combustion gas turbine in Example 1 of the combined cycle power generation facility of the present invention is applied and the start-up characteristics of the conventional combined cycle power generation facility.
FIG. 5: Load operation characteristics (operation corresponding to high-speed load change) when the high-humidity combustion gas turbine in Example 1 of the combined cycle equipment of the present invention is applied, and load operation characteristics (high-speed load change) of the conventional combined cycle equipment. It is a characteristic diagram showing by comparing the corresponding operation).
Mode for carrying out the invention
[0021]
　Hereinafter, the combined cycle equipment of the present invention and its operation method will be described based on the illustrated examples.
In each figure, the same reference numerals are used for the same components.
Example 1
[0022]
　FIG. 2 shows a schematic configuration of Example 1 of the combined cycle power generation facility of the present invention.
[0023]
　The combined power generation equipment of the present embodiment shown in FIG. 2 is generated by a gas turbine, an exhaust heat recovery boiler 5 that generates steam using exhaust gas as a heat source, and the exhaust heat recovery boiler 5 as in the conventional combined power generation equipment. A steam turbine 9 driven by steam is provided, but in this embodiment, as a gas turbine, a high-humidity combustion gas turbine configured to inject steam generated in the exhaust heat recovery steam generator 5 into a combustor. This is a combined power generation facility to which 3a is applied. Along with this, a high-humidity compressor 1a is used as the compressor, and a high-humidity combustor 2a is used as the combustor.
[0024]
　Further, in the present embodiment, the control device 32 for controlling the amount of steam generated in the exhaust heat recovery boiler 5 injected into the high-humidity combustion gas turbine 3a via the high-humidity combustion device 2a is provided, and high-humidity combustion is provided. When the gas turbine 3a is started, the amount of steam generated by the exhaust heat recovery boiler 5 to be injected into the high-humidity combustion gas turbine 3a is controlled by the control device 32, and the steam (high-pressure steam) generated by the exhaust heat recovery boiler 5 is controlled. The entire amount is injected into the high-humidity combustion gas turbine 3a via the high-humidity combustion gas turbine 2a to start the high-humidity combustion gas turbine 3a.
[0025]
　Further, in this embodiment, after the stable operation of the high-humidity combustion gas turbine 3a, the steam turbine 9 is warmed up by the low-pressure steam generated in the exhaust heat recovery boiler, and the metal temperature of the steam turbine 9 is set to the difference between the aerated steam temperature. After raising the temperature change width and temperature change rate to the specified temperature due to thermal stress limitation, the steam (high pressure steam) that had been ventilated to the high-humidity combustion gas turbine 3a was switched to ventilation to the steam turbine 9 for combined power generation operation. During high-speed load change operation of the high-humidity combustion gas turbine 3a, the entire amount of steam (high-pressure steam) ventilated to the steam turbine 9 is switched to ventilation to the high-humidity combustion gas turbine 3a. There is.
[0026]
　The control device 32 of this embodiment includes a low pressure drum outlet steam pressure P1 of the exhaust heat recovery boiler 5, a low pressure drum outlet steam temperature T1, a low pressure drum outlet steam flow rate F1, a steam turbine inlet low pressure steam pressure P2, and a steam turbine inlet low pressure steam. Temperature T2, low pressure steam bypass flow rate F2, superheater outlet steam pressure P3, superheater outlet steam temperature T3, superheater outlet steam flow rate F3, steam turbine inlet high pressure steam pressure P4, steam turbine inlet high pressure steam temperature T4, high pressure steam bypass flow rate F4, gas turbine steam injection pressure P5, gas turbine steam injection temperature T5, gas turbine steam injection flow rate F5, recovery water flow rate F6 in the water recovery device 15 described later, compressor inlet air pressure P7, compressor inlet air flow rate F7, Compressor outlet air pressure P8, fuel flow rate F9, gas turbine exhaust pressure P10, gas turbine exhaust temperature T10, gas turbine generator output E1, steam turbine generator output E2, gas turbine generator rotation speed R1 and steam turbine generator rotation The number R2 is input as a measurement signal, and the low pressure steam bypass valve 25, the high pressure steam bypass valve 26, the gas turbine steam injection valve 27, the high pressure steam control valve 28, the low pressure steam control valve 29, the compressor inlet guide blade 30, and the fuel flow rate adjustment The opening and closing of the valve 31 is controlled.
[0027]
　Low pressure drum outlet steam pressure P1, low pressure drum outlet steam temperature T1, low pressure drum outlet steam flow rate F1, steam turbine inlet low pressure steam pressure P2, steam turbine inlet low pressure steam temperature T2, low pressure steam bypass flow rate F2, overheating of exhaust heat recovery boiler 5. The outlet steam pressure P3, the superheater outlet steam temperature T3, the superheater outlet steam flow rate F3, the steam turbine inlet high pressure steam pressure P4, and the steam turbine inlet high pressure steam temperature T4 are the exhaust heat recovery boiler 5 and steam from start-up to load operation. It is taken into the control device 32 as a coordinated control signal based on the stable operation of the turbine 9, and the high-pressure steam bypass flow rate F4 takes the signal into the control device 32 as a protection operation when the amount of steam flowing into the water recovery device 11 is excessive. ..
[0028]
　In this embodiment, the superheater outlet steam pressure P3, the superheater outlet steam temperature T3, and the superheater outlet steam flow rate F3 of the steam generated in the exhaust heat recovery boiler 5 are input to the control device 32, and the superheater 24 in the control device 32. After it is determined that the outlet steam conditions of the above have been established, the warm-up operation of the steam injection system is started, and after the warm-up operation of the steam injection system is completed, the gas turbine steam injection valve 27 is based on the command from the control device 32. Is opened, and the entire amount of steam (high-pressure steam) generated in the exhaust heat recovery boiler 5 is injected into the high-humidity combustion gas turbine 3a via the high-humidity steam burner 2a.
[0029]
　That is, as shown in FIG. 3, the establishment of the outlet steam condition of the superheater 24 means the establishment of the conditions of the superheater outlet steam pressure P3, the superheater outlet steam temperature T3, and the superheater outlet steam flow rate F3, and this condition has been established. After that, the warm-up operation of the steam injection system is started, and the opening operation of the gas turbine steam injection valve 27 is after the warm-up operation of the steam injection system is completed.
[0030]
　After opening the gas turbine steam injection valve 27, the control device 32 controls the high-pressure steam bypass valve 26 installed on the upstream side of the water recovery device 11 so that the outlet steam pressure of the exhaust heat recovery boiler 5 does not decrease. While opening and controlling the gas turbine steam injection valve 27, finally, the entire amount of steam (high pressure steam) generated in the exhaust heat recovery boiler 5 is transferred to the high humidity combustion gas turbine 3a via the high humidity steam generator 2a. Is injecting into.
[0031]
　Further, when the gas turbine steam injection valve 27 is opened, the control device 32 confirms that the gas turbine steam injection pressure P5 and the gas turbine steam injection temperature T5 have reached the ventilation conditions of the high-humidity combustion gas turbine 3a. Will be done.
[0032]
　That is, the warm-up operation of the high-humidity combustion gas turbine 3a and the turbine bypass system is completed from the outlet of the exhaust heat recovery boiler 5 (the conditions for completing the warm-up operation are the high-pressure steam temperature T4 at the steam turbine inlet and the gas turbine steam injection temperature T5. After that, the control device 32 confirms that the gas turbine steam injection pressure P5 and the gas turbine steam injection temperature T5 at the inlet of the high-humidity combustion gas turbine 3a have reached the gas turbine ventilation conditions. Then, the gas turbine steam injection valve 27 is opened.
[0033]
　However, the gas turbine steam injection valve 27 is opened while the high-pressure steam bypass valve 26 is controlled by the control device 32 so that the outlet steam pressure of the exhaust heat recovery boiler 5 does not drop.
[0034]
　In addition, when the load rises, the amount of steam required for NOX lower than the fuel-air ratio set by the ratio of the fuel flow rate F9 and the compressor inlet air pressure flow rate F7 and the specified humidity content and the amount of steam for increasing output are calculated. The gas turbine steam injection valve 27 is opened. At that time, the gas turbine steam injection flow rate F5 is used as a feedback signal for opening control of the gas turbine steam injection valve 27.
[0035]
　Further, as shown in FIG. 3, the low-pressure steam bypass valve 25 and the high-pressure steam bypass valve 26 open after the gas turbine is ignited, and the high-pressure steam bypass valve 26 is a gas turbine steam injection valve 27 for exhaust heat recovery boiler 5. The high-pressure steam generated in the above is fully closed in a ventilated state.
[0036]
　In the high-pressure steam control valve 28, after the outlet steam conditions of the superheater 24 (superheater outlet steam pressure P3 and superheater outlet steam temperature T3) are established, the steam turbine inlet high-pressure steam pressure P4 and the steam turbine inlet high-pressure steam temperature T4 are steamed. Open control is performed after confirming that the ventilation conditions of the turbine 9 have been reached.
[0037]
　The low-pressure steam bypass valve 25 controls the low-pressure steam control valve 29 after the start of warm-up operation of the steam turbine 9 and is fully closed.
[0038]
　Further, at the initial stage of starting the high-humidity combustion gas turbine 3a, the generated steam of the exhaust heat recovery boiler 5 is used until the ventilation conditions of the high-humidity combustion gas turbine 3a and the steam turbine 9 are established. It is provided with a bypass system facility for discharging to the condenser 11 via the low-pressure steam bypass valve 25 and the high-pressure steam bypass valve 26.
[0039]
　Further, after the steam generated from the low pressure evaporator 22 and the high pressure evaporator 23 of the exhaust heat recovery boiler 5 establishes the ventilation conditions of the steam turbine 9, the high pressure steam control valve 28 provided on the upstream side of the steam turbine 9 and the high pressure steam control valve 28 It is equipped with a steam turbine facility in which the steam generated by the exhaust heat recovery boiler 5 is introduced into the steam turbine 9 via the low-pressure steam control valve 29, and the steam energy is recovered as an electric output via the steam turbine generator 10.
[0040]
　Further, in this embodiment, a water recovery device 15 installed on the downstream side of the exhaust heat recovery boiler 5 and recovering the steam vented to the high-humidity combustion gas turbine 3a and the steam generated by the combustion generation is provided, and this water recovery is provided. The steam recovered by the device 15 is reused as water supply for the exhaust heat recovery boiler 5.
[0041]
　That is, the water recovery device 15 includes an exhaust tower 14 in which the filling material 16 is filled and exhaust gas is exhausted, and the water vapor in the water recovery device 15 is recovered by the water recovery circulation pump 17 and the water recovery circulation. After being cooled by the water cooler 18, it returns to the water recovery device 15 as circulating water.
[0042]
　A part of the circulating water (reclaimed water) after being cooled by the water recovery circulating water cooler 18 is stored in the make-up water tank 19, and the recovered water in the make-up water tank 19 is collected via the recovered water feed pump 20. Therefore, the boiler water supplied by the low-pressure water supply pump 12 is introduced into the system for supplying the exhaust heat recovery boiler 5, and is reused as the water supply for the exhaust heat recovery boiler 5.
[0043]
　The effect of this embodiment will be described with reference to FIGS. 4 and 5.
[0044]
　FIG. 4 shows a comparison between the start-up characteristics when the high-humidity combustion gas turbine in this embodiment is applied and the start-up characteristics of the conventional combined cycle equipment, and FIG. 5 shows the high-humidity combustion gas turbine in this embodiment. This is a comparison of the load operation characteristics (high-speed load change operation) and the load operation characteristics of the conventional combined cycle equipment (high-speed load change operation) when is applied.
[0045]
　4 and 5 (a) are time on the horizontal axis, load operation ratio is on the vertical axis, time is on the horizontal axis, and power generation end efficiency is on the vertical axis, and FIGS. In (c) of 5, the horizontal axis represents time and the vertical axis represents steam flow rate.
[0046]
　In both cases of the start-up characteristics when the high-humidity combustion gas turbine of FIG. 4 is applied and the load operation characteristics (operation corresponding to high-speed load change) when the high-humidity combustion gas turbine of FIG. 5 is applied, this embodiment It can be seen that the start-up time of the high-humidity combustion gas turbine 3a is shorter in (A) than in the conventional combined power generation facility (B).
[0047]
　In particular, in the present embodiment (A), at the initial stage of starting the high-humidity combustion gas turbine 3a, the entire amount of steam (high-pressure steam) generated in the exhaust heat recovery boiler 5 is injected into the high-humidity combustion gas turbine 3a. By independently operating the high-humidity combustion gas turbine 3a up to a load equivalent to about 90% as the load of the combined power generation equipment, 90% load from ignition of the high-humidity combustion gas turbine 3a (power generation end at 100% load of the combined power generation equipment). It is possible to reduce the startup time up to (relative value based on the output) to 1/5 (about 10 minutes).
[0048]
　Further, after stable operation of the high-humidity combustion gas turbine 3a, the steam turbine 9 is warmed up to raise the metal temperature of the steam turbine 9 to the specified temperature of the temperature change width and the temperature change rate due to the thermal stress limitation of the aeration steam temperature difference. After raising, of the steam that was aerated to the high-humidity combustion gas turbine 3a, the remaining steam excluding the injection to reduce the nitrogen oxides (NOx) discharged from the gas turbine is sent to the steam turbine 9. By ventilating and operating the combined power generation, highly efficient operation of the combined power generation equipment becomes possible.
[0049]
　Further, when the high-humidity combustion gas turbine 3a is started, the entire amount of steam (high-pressure steam) generated in the exhaust heat recovery boiler 5 is injected into the high-humidity combustion gas turbine 3a, so that the high-humidity combustion gas turbine 3a It is possible to improve the start-up time and the performance at the time of partial load (power generation end efficiency) at the time of start-up.
[0050]
　That is, in the start-up operation of a general combined cycle facility, the operating state of the gas turbine at the start of the load operation of the steam turbine is a partial load operation due to the thermal stress limitation of the bottoming facility (steam turbine). It was an operation to increase the load toward the rating.
[0051]
　On the other hand, in this embodiment, the high-humidity combustion turbine is independently brought to the rated load before the start of the load operation of the steam turbine (before the combined operation of the gas turbine and the steam turbine), and the state is changed to the combined operation. I'm letting you. Therefore, the ratio of the rated load operation period of the gas turbine to the period when the combined cycle equipment reaches the rated load increases, and the operation with improved thermal efficiency at the time of starting becomes possible.
[0052]
　Further, during high-speed load change operation of the high-humidity combustion gas turbine 3a, the entire amount of steam (high-pressure steam) that has been ventilated to the steam turbine 9 is switched to ventilation to the high-humidity combustion gas turbine 3a. , High-speed load response is possible.
[0053]
　Further, the control device of the combined cycle equipment in this embodiment includes a start-up time shortening operation mode and a high-speed load change operation mode in addition to the normal start mode and the normal load operation mode of the combined cycle equipment.
[0054]
　In the operation mode for shortening the start-up time, when the combined power generation facility is started, the entire amount of high-pressure steam generated in the exhaust heat recovery boiler is injected into the combustor of the high-humidity combustion gas turbine to raise the high-humidity combustion gas turbine to the rated load. After the warm-up of the steam turbine by the low-pressure steam generated in the exhaust heat recovery boiler is completed, the high-pressure steam is ventilated to the steam turbine. By operating the start-up time shortening operation mode, the high-humidity combustion gas turbine can be rapidly started up to the rated load as described above, and the start-up time can be significantly shortened. Further, it is possible to improve the thermal efficiency of the gas turbine at the time of starting.
[0055]
　Further, in the high-speed load change operation mode, during the load operation after the start-up of the combined cycle equipment is completed, the supply destination of the high-pressure steam to be ventilated to the steam turbine is switched to the combustor, and the high-humidity combustion gas turbine is operated independently. In the high-speed load change operation mode, the combined operation of the steam turbine and the gas turbine (operation that emphasizes thermal performance) is shifted to the independent operation of the high-humidity combustion gas turbine (operation that emphasizes load response). Since it is operated independently by a high-humidity combustion gas turbine, it is not restricted by the thermal stress limit of the bottoming equipment (steam turbine), and high-speed load change operation is possible.
[0056]
　The present invention is not limited to the above-mentioned examples, and includes various modifications.
For example, the above-described embodiment has been described in detail in order to explain the present invention in an easy-to-understand manner, and is not necessarily limited to those having all the described configurations. Further, it is possible to replace a part of the configuration of one embodiment with the configuration of another embodiment, and it is also possible to add the configuration of another embodiment to the configuration of one embodiment. Further, it is possible to add / delete / replace a part of the configuration of each embodiment with another configuration.
Code description
[0057]
　1 ... Compressor, 1a ... High humidity compressor, 2 ... Combustor, 2a ... High humidity compressor, 3 ... Gas turbine, 3a ... High humidity combustion gas turbine, 4 ... Gas turbine generator, 5 ... Exhaust heat recovery boiler, 6 ... low pressure drum, 7 ... high pressure drum, 8 ... high pressure water supply pump, 9 ... steam turbine, 10 ... steam turbine generator, 11 ... water recovery device, 12 ... low pressure water supply pump, 13 ... ground steam Steam turbine, 14 ... exhaust tower, 15 ... water recovery device, 16 ... filling, 17 ... water recovery circulation pump, 18 ... water recovery circulation water cooler, 19 ... make-up water tank, 20 ... recovery water supply pump, 21 ... Coal saver, 22 ... Low pressure evaporator, 23 ... High pressure compressor, 24 ... Compressor, 25 ... Low pressure steam bypass valve, 26 ... High pressure steam bypass valve, 27 ... Gas turbine steam injection valve, 28 ... High pressure steam control valve , 29 ... Low pressure steam control valve, 30 ... Compressor inlet guide blade, 31 ... Fuel flow control valve, 32 ... Control device, P1 ... Low pressure drum outlet steam pressure, T1 ... Low pressure drum outlet steam temperature, F1 ... Low pressure drum outlet steam Flow rate, P2 ... Steam turbine inlet low pressure steam pressure, T2 ... Steam turbine inlet low pressure steam temperature, F2 ... Low pressure steam bypass flow rate, P3 ... Compressor outlet steam pressure, T3 ... Compressor outlet steam temperature, F3 ... Compressor outlet steam flow rate , P4 ... Steam turbine inlet high pressure steam pressure, T4 ... Steam turbine inlet high pressure steam temperature, F4 ... High pressure steam bypass flow rate, P5 ... Gas turbine steam injection pressure, T5 ... Gas turbine steam injection temperature, F5 ... Gas turbine steam injection flow rate, F6 ... Recovered water flow rate in the water recovery device, P7 ... Compressor inlet air pressure, F7 ... Compressor inlet air flow rate, P8 ... Compressor outlet air pressure, F9 ... Fuel flow rate, P10 ... Gas turbine exhaust pressure, T10 ... Gas Turbine exhaust temperature, E1 ... gas turbine generator output, E2 ... steam turbine generator output, R1 ... gas turbine generator rotation speed, R2 ... steam turbine generator rotation speed.
The scope of the claims
[Claim 1]
　The gas turbine includes an exhaust heat recovery boiler that generates steam using the exhaust gas of the gas turbine as a heat source, and a steam turbine that is driven by the steam generated by the exhaust heat recovery boiler. The gas turbine includes the exhaust heat recovery. It is an operation method of a combined power generation facility to which a high-humidity combustion gas turbine configured to inject steam generated in a boiler into a combustor is applied, and the
　exhaust heat recovery is performed when the high-humidity combustion gas turbine is started. A method for operating a combined power generation facility, which comprises injecting the entire amount of steam generated in a boiler into the high-humidity combustion gas turbine via the combustor and starting the turbine.
[Claim 2]
　In the operation method of the combined power generation facility according to claim 1, after
　the superheater outlet steam pressure and the superheater outlet steam temperature of the steam generated in the exhaust heat recovery boiler establish the outlet steam condition of the superheater. After the warm-up operation of the steam injection system is started and the warm-up operation of the steam injection system is completed, the gas turbine steam injection valve installed on the upstream side of the combustor is opened and generated in the exhaust heat recovery boiler. A method for operating a combined power generation facility, which comprises injecting the entire amount of steam generated into the high-humidity combustion gas turbine via the combustor.
[Claim 3]
　The method for operating a combined power generation facility according to claim 2,
　wherein after the gas turbine steam injection valve is opened, the outlet steam pressure of the exhaust heat recovery boiler does not drop on the upstream side of the condenser. An operation method of a combined power generation facility, characterized in that the gas turbine steam injection valve is opened and controlled while controlling an installed high-pressure steam bypass valve.
[Claim 4]
　The method for operating a combined power generation facility according to claim 3,
　wherein the gas turbine steam injection valve is opened so that the gas turbine steam injection pressure and the gas turbine steam injection temperature are adjusted to the ventilation conditions of the high humidity combustion gas turbine. An operation method of a complex power generation facility, which is characterized by confirming that the power has been reached.
[Claim 5]
　The method for operating a combined power generation facility according to any one of claims 1 to 4,
　wherein the steam vented to the high-humidity combustion gas turbine and the steam generated by combustion generation are downstream of the exhaust heat recovery boiler. An operation method of a combined power generation facility, which is recovered by a water recovery device installed on the side and reused as water supply for the exhaust heat recovery boiler.
[Claim 6]
　The method for operating a combined power generation facility according to any one of claims 1 to 5
　, wherein the steam turbine is warmed up after stable operation of the high-humidity combustion gas turbine, and the metal temperature of the steam turbine is increased. After raising the temperature change width and temperature change rate to the specified temperature due to the thermal stress limitation of the aeration steam temperature difference, the steam that had been aerated to the high-humidity combustion gas turbine is switched to the aeration to the steam turbine for combined power generation. An operation method for a combined power generation facility, which is characterized by being operated.
[Claim 7]
　The operation method of the combined power generation facility according to claim 6, and
　during the high-speed load change operation of the high-humidity combustion gas turbine, the entire amount of steam ventilated to the steam turbine is burned with the high-humidity content. An operation method for a combined power generation facility, which is characterized by switching to ventilation to a gas turbine.
[Claim 8]
　The method for operating a combined power generation facility according to claim 1,
　wherein the exhaust heat recovery steam generator generates high-pressure steam and low-pressure steam, and when the combined power generation facility is started, the high-pressure steam is used in the combustor. A method for operating a combined power generation facility, which comprises injecting the high-humidity combustion gas turbine into the high-humidity combustion gas turbine and supplying the low-pressure steam as warm-up steam to the steam turbine.
[Claim 9]
　The gas turbine includes an exhaust heat recovery boiler that generates steam using the exhaust gas of the gas turbine as a heat source, and a steam turbine that is driven by the steam generated by the exhaust heat recovery boiler. The gas turbine includes the exhaust heat recovery. A combined power generation facility to which a high-humidity combustion gas turbine configured to inject steam generated in a boiler into a combustor is applied
　, and the steam generated in the exhaust heat recovery steam is said to be high through the combustor. A control device for controlling the amount to be injected into the
　high-humidity combustion gas turbine is provided, and when the high-humidity combustion gas turbine is started, the amount of steam generated by the exhaust heat recovery boiler to be injected into the high-humidity combustion gas turbine is determined. A combined power generation facility controlled by the control device and injecting the entire amount of steam generated in the exhaust heat recovery boiler into the high-humidity combustion gas turbine via the combustor to start the system.
[Claim 10]
　In the combined power generation facility according to claim 9, a
　gas turbine steam injection valve is installed on the upstream side of the combustor, and information on steam generated by the exhaust heat recovery steam source is input to the control device. Based on this information, the control device opens the gas turbine steam injection valve, and injects the entire amount of steam generated by the exhaust heat recovery boiler into the high-humidity combustion gas turbine via the combustor. A featured complex power generation facility.
[Claim 11]
　In the combined power generation facility according to claim 10,
　the superheater outlet steam pressure and the superheater outlet steam temperature of the steam generated in the exhaust heat recovery boiler are input to the control device, and the superheater outlet in the control device After determining that the steam conditions have been established, the warm-up operation of the steam injection system is started, and after the warm-up operation of the steam injection system is completed, the gas turbine steam injection valve is operated based on a command from the control device. A combined power generation facility that is opened and injects the entire amount of steam generated in the exhaust heat recovery boiler into the high-humidity combustion gas turbine via the combustor.
[Claim 12]
　In the combined power generation facility according to claim 10,
　after the gas turbine steam injection valve is opened, the control device is used on the upstream side of the condenser so that the outlet steam pressure of the exhaust heat recovery boiler does not decrease. A combined power generation facility characterized in that the gas turbine steam injection valve is opened and controlled while controlling the high-pressure steam bypass valve installed in.
[Claim 13]
　In the combined power generation facility according to claim 12, when the
　gas turbine steam injection valve is opened, the gas turbine steam injection pressure and the gas turbine steam injection temperature reach the ventilation conditions of the high humidity combustion gas turbine. A combined power generation facility characterized in that this is confirmed by the control device.
[Claim 14]
　In the combined power generation facility according to any one of claims 9 to 13,
　at the initial stage of starting the high-humidity combustion gas turbine, the generated steam of the exhaust heat recovery boiler is the high-humidity combustion gas turbine and the said. Until the ventilation conditions of the steam turbine are established, the combined power generation is characterized by being equipped with a bypass system facility that discharges the generated steam of the exhaust heat recovery boiler to the condenser via the low-pressure steam bypass valve and the high-pressure steam bypass valve. Facility.
[Claim 15]
　In the combined power generation facility according to claim 14, after
　the generated steam of the exhaust heat recovery boiler establishes the ventilation conditions of the steam turbine, a high-pressure steam control valve and a low-pressure valve provided on the upstream side of the steam turbine. It is characterized in that it is provided with a steam turbine facility that introduces the generated steam of the exhaust heat recovery boiler via a steam control valve into the steam turbine and recovers the steam energy as an electric output via a generator for the steam turbine. Combined power generation facility.
[Claim 16]
　The
　water recovery device according to claim 15, which is installed on the downstream side of the exhaust heat recovery boiler and recovers the steam vented to the high-humidity combustion gas turbine and the steam generated by combustion generation. A combined power generation facility characterized in that the steam recovered by the water recovery device is reused as water supply for the exhaust heat recovery boiler.
[Claim 17]
　The combined power generation facility according to any one of claims 9 to 16,
　wherein the control device uses
　the total amount of high-pressure steam generated by the exhaust heat recovery steam generator as the high humidity content when the combined power generation facility is started. After injecting into the combustor of the combustion gas turbine to raise the high-humidity combustion gas turbine to the rated load and completing warm-up of the steam turbine by the low-pressure steam generated in the exhaust heat recovery boiler, the high-pressure During the operation mode for shortening the start-up time for venting steam to the steam turbine and
　the load operation after the start-up of the combined power generation facility is completed, the supply destination of the high-pressure steam to be ventilated to the steam turbine is switched to the combustor to obtain the high pressure. A combined power generation facility equipped with a high-speed load change operation mode that allows the moisture combustion gas turbine to operate independently.