JP5596715B2 - Solar thermal combined power generation system and solar thermal combined power generation method - Google Patents

Description

  The present invention relates to a combined solar thermal power generation system and a combined solar thermal power generation method, and in particular, a combined solar thermal power generation system that reduces the amount of fossil fuel used for boiler fuel by combining a steam generator boiler device and a solar thermal collector. And a solar thermal combined power generation method.

  As a power generation system using solar heat, a steam is generated by solar heat, and a solar power generation system that rotates a steam turbine using this steam, or a compressive working fluid using solar heat energy as described in Patent Document 1, is used. There is a solar thermal power generation system that heats and heats and rotates a solar gas turbine.

  Moreover, in the solar thermal power generation system, it is necessary to consider a large change in daytime weather from dawn to sunset. For example, Patent Document 2 discloses heat heated by sunlight in a heat exchanger that generates steam. Even if the heat medium heating device using a burner is installed in the middle of the heat medium supply passage for supplying the medium, and the temperature of the heat medium heated by sunlight is fluctuating, the temperature is lowered. A solar thermal power generation system is proposed in which a heat medium is heated by a heat medium heating device and supplied to a heat exchanger so that fluctuations in the state of steam supplied to the steam turbine can be effectively suppressed. ing.

  Further, in Patent Document 3, as a power generation system using both solar thermal energy and fossil fuel, a solar thermal preheater that preheats compressed air with a solar thermal fluid and supplies the compressed air to a gas turbine combustor, and an exhaust gas from the gas turbine are used. There has been proposed a combined solar thermal power generation system provided with a solar evaporator / superheater that heats a heated working fluid from an exhaust heat recovery steam generator that generates steam and supplies the steam to the steam turbine.

JP 2010-275997 A JP 2008-39367 A JP 2011-117447 A

  In a solar thermal power generation system using only solar thermal energy, the energy source for driving the turbine is lost in the weather conditions such as nighttime or rainy weather where solar heat cannot be obtained, and the time during which the turbine cannot be operated increases, leading to a reduction in operating rate. A stable power supply is the primary mission of power plants, and building a power plant with solar heat alone is risky.

  Therefore, in order to generate power stably without being affected by the weather conditions, a solar thermal power generation system using fossil fuel is considered effective.

  As a solar thermal power generation system using fossil fuels in combination, there are power generation systems described in Patent Documents 2 and 3, each of which has an effect of suppressing fluctuations in the vapor state and capable of operation according to the state of fuel and solar thermal energy. . As solar heat utilization, Patent Document 2 is a system that generates steam by solar heat, and Patent Document 3 is a system that heats compressed air for gas turbine combustion and steam supplied to the steam turbine by solar heat.

  An object of the present invention is a solar thermal power generation system using a fossil fuel in combination, and a solar thermal combined power generation system and a solar thermal composite capable of stably generating power without being affected by weather conditions by using solar heat different from the conventional one It is to provide a power generation method.

  The present invention utilizes solar thermal energy as a heating source for combustion air of a boiler. The boiler is a pressurized boiler, and the compressed combustion air is superheated with solar thermal energy and introduced into the pressurized boiler. The boiler fuel is combusted with compressed and overheated combustion air to generate high-temperature and high-pressure gas, and steam is generated by this high-temperature and high-pressure gas and supplied to the steam turbine to drive the steam turbine generator, and from the pressurized boiler The high-pressure exhaust gas is introduced into an expansion gas turbine, and the compressor for compressing the combustion air of the boiler and the gas turbine generator are driven by the expansion gas turbine.

  Further, the present invention is characterized in that a temperature reducer is provided between the evaporator and superheater of the pressurized boiler, and the steam temperature supplied to the steam turbine is adjusted by the temperature reducer.

  In addition, the present invention is characterized in that a solar heat storage device is provided, and the combustion air compressed using a high-temperature heating medium from the solar heat storage device is overheated.

  ADVANTAGE OF THE INVENTION According to this invention, the new solar thermal combined power generation system which used the fossil fuel which can generate electric power stably without being influenced by a weather condition is realizable.

It is a figure which shows the solar thermal pressure combined power generation system which concerns on one Example of this invention. It is a figure which shows the detailed structure of the air superheater apparatus in FIG.

  The combined solar thermal power generation system of this embodiment is configured to reduce the amount of fossil fuel used for boiler fuel by combining a steam generator boiler device and a solar heat collector. Specifically, the boiler apparatus is a pressurized boiler apparatus in which a boiler is installed in a pressure vessel, such as a boiler apparatus in a pressurized fluidized bed combined power plant that is a form of thermal power generation. The apparatus is provided with an air superheater utilizing solar heat in the combustion air supply system. Then, high-pressure air for boiler combustion is heated by solar thermal energy and put into a pressurized boiler, fuel is burned in air, a steam turbine is driven by steam generated by heat exchange between high-temperature and high-pressure gas and working fluid, and pressurized The gas turbine is driven by high pressure exhaust gas from the boiler. In other words, steam and high-temperature high-pressure gas are produced by a pressurized boiler, and the steam turbine and the gas turbine are driven simultaneously. And the gas for boiler combustion is compressed with a gas turbine, and electric power generation is performed.

  In this embodiment, since combustion air is supplied to the pressurized boiler after being heated by using solar heat, the pressurized boiler is hereinafter referred to as a solar thermal pressurized boiler, and the solar thermal combined power generation system is referred to as a solar thermal pressurized combined power generation system. .

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a system diagram of a solar heat combined power generation system, which includes a solar heat collector (solar heat recovery device) 100, an air superheater 200, a solar pressure boiler device 300, a gas turbine power generation / compression device 400, and An example of a solar heat combined power generation system including a steam turbine power generation device 500 is shown.

  The solar heat collecting apparatus 100 according to the present embodiment collects solar heat and stores it at the same time. The solar heat collecting apparatus 100 includes a solar heat collecting part that collects sunlight and a solar heat collecting apparatus that stores solar heat. In this embodiment, a solar heat storage device is used, but a heat medium may be supplied from the solar heat collector (solar heat collector 63) to the air superheater 200 without using the solar heat storage device. However, in the case of the solar heat combined power generation system of the present invention, the use of the solar heat storage device is suitable, and it is better to use the solar heat storage device in consideration of sudden change in weather or night use. That is, by using solar thermal energy storage device, solar thermal energy stored in the daytime is used to overheat the fossil fuel combustion air at night, and solar-heated combined power generation using solar heat at night can be performed.

  In the present embodiment, a tower type that collects solar heat using a solar reflector (heliostat) 5 and a solar heat collector 63 is used as the solar heat collector. The solar heat collecting section is not limited to the tower type, but can be applied to a trough type using a curved reflecting mirror or a Fresnel type using a long plane mirror. That is, the idea of collecting solar heat is the same for all three types, and is not particularly limited.

  The solar heat storage device includes a high-temperature heat medium heat storage tank 6 and a low-temperature heat medium heat storage tank 7. In this embodiment, molten salt is used as a heat storage heat storage medium for storing or radiating the collected solar thermal energy. As the molten salt, a molten salt of sodium nitrate or potassium nitrate is used. Also, when storing solar heat energy, separate the heat medium (water, etc.) flowing through the solar heat collector and the heat medium (molten salt) flowing through the solar heat storage device, and the heat medium and solar heat storage collected by the solar heat collector Heat may be stored in the solar heat storage device by exchanging heat with the low-temperature heat medium from the device.

  Sunlight 61 emitted from the sun 60 is reflected by a large number of sunlight reflecting mirrors 5 and becomes a sunlight reflected light beam 62 and is collected in a solar heat collector 63. The solar heat collector 63 is installed at a high position on the top of the solar heat collection tower 4.

  The high-temperature heat medium heated by the solar heat collector 63 flows through the high-temperature heat medium pipe 8 in the solar heat collector tower and is stored in the high-temperature heat medium heat storage tank 6. The high-temperature heat medium exiting the high-temperature heat medium storage tank 6 passes through the high-temperature heat medium air superheater inlet pipe 9 and the high-temperature heat medium air superheater inlet valve 50 and is introduced into the air superheater 66, from the air compressor 15. The high-pressure air that has been sent is further heated (details will be described later). The low-temperature heat medium exiting the air superheater 66 passes through the low-temperature heat medium air superheater outlet pipe 10 and the low-temperature heat medium air superheater outlet valve 50 and is stored in the low-temperature heat medium heat storage tank 7.

  The low-temperature heat medium passes through the low-temperature heat medium heat storage tank outlet pipe 11 by a heat medium circulation pump (not shown) installed in the low-temperature heat medium heat storage tank 7 and is transferred to the solar heat collector 63 and reheated. Then, it becomes a high-temperature heat medium, and is sent again to the air superheater 66 through the high-temperature heat medium heat storage tank 6.

  The solar thermal energy collected in this way is used in a boiler apparatus for steam power generation as follows to reduce the amount of fossil fuel used for boiler fuel.

  In other words, in the present embodiment, the recovered solar thermal energy is utilized not as combustion air for a gas turbine as in Patent Document 3 but as combustion air for a boiler. The combustion air of the boiler is compressed air, and the compressed air is heated by solar heat and charged into the boiler to burn the fuel and generate high-temperature and high-pressure gas. In other words, in order to utilize solar thermal energy and fossil fuel combustion energy at the same time, the boiler combustion air supplied from the air compressor is further heated using solar thermal energy and converted into high-temperature and high-pressure air into a solar-heated pressure boiler. I am trying to throw it in. Since the exhaust gas from the boiler becomes high-pressure exhaust gas, it can be used as a working fluid for the gas turbine. A gas turbine driven by high-pressure exhaust gas is used as a drive source for a compressor for combustion air of a boiler in addition to a generator.

  The gas temperature at the gas turbine inlet is secured by the combustion temperature in the solar pressure boiler, and the higher the combustion air temperature, the less fuel is consumed in the solar pressure boiler and the more economical (high efficiency A solar combined power generation system). At the same time, by reducing the amount of combustion gas in the solar pressure boiler, the emission of harmful nitrogen oxides, sulfur oxides and carbon dioxide is greatly reduced.

  First, the air superheater 200 will be described. The air superheater 200 further heats and raises the temperature of the combustion air by a high-temperature heat medium heated by solar heat energy in the high-pressure high-temperature air pressurized by the air compressor 15 in order to superheat the combustion air and put it into the solar heat pressurizing boiler 1. To do. In the air superheater 66 of the air superheater 200, a high-temperature heat medium heated by solar thermal energy is introduced as a heating medium, and compressed air is introduced as a medium to be heated.

  The structure will be described in detail with reference to FIG. FIG. 2 shows an extracted system around the solar heat collector 100 and the air superheater 66 in the air superheater 200 in the solar heat combined power generation system of FIG. The same reference numerals as those in FIG.

  The air superheater 66 is provided with an air superheater heat transfer pipe 71 therein. The high temperature heat medium from the high temperature heat medium heat storage tank 6 sent through the high temperature heat medium air superheater inlet pipe 9 passes through the air superheater heat transfer pipe inlet header provided in the air superheater 66, and the air superheater heat transfer pipe. 71. On the other hand, compressed air from the air compressor 15 is introduced into the air superheater 66 through the air superheater inlet pipe 16. The high-temperature heat medium sequentially flows through the air superheater heat transfer pipe 71, further superheats the introduced compressed air, cools itself, and is collected in the air superheater heat exchanger pipe outlet header at the outlet of the air superheater 66. In addition, the air superheater heat transfer pipe 71 heats the compressed air with a high-temperature heat medium having the highest temperature on the compressed air inlet side of the air superheater 66, and the temperature is next on the compressed air outlet side of the air superheater 66. It arrange | positions so that compressed air may be overheated by the high temperature heat medium of a high state. The compressed air that has been heated to a high temperature (high-temperature high-pressure air) is sent to the solar pressure boiler window box 69 through the air superheater outlet pipe 17 and is used here as combustion air for the solar pressure boiler 1. The high-temperature heat medium that has exchanged heat in the air superheater 66 changes to a low-temperature heat medium, exits from the air heater 66 via the heat transfer pipe outlet header in the air superheater, and passes through the low-temperature heat medium air superheater outlet pipe 10. It is sent to the low-temperature heat medium heat storage tank 7.

  The compressed air supplied to the overheated side of the air superheater 66 is produced by the air compressor 15 of the gas turbine power generation / compression device. The air taken in from the air inlet duct 12 passes through the air compressor inlet valve 13, flows through the air compressor inlet duct 14, is introduced into the air compressor 15, and is compressed. The air compressor inlet valve 13 is throttled to prevent a surging accident of the air compressor 15 at the time of start-up, the compressor suction pressure is reduced to reduce the air flow rate, and the pressure ratio of the air compressor 15 is maintained at a specified value. The air compressor 15 is operated safely. The compressed air passes through the air superheater inlet stop valve 64, flows through the air superheater inlet pipe 16, and is introduced into the air superheater 66. Here, the compressed air at the outlet of the air compressor 15 is medium temperature air, and further heated by the air superheater 66 to be heated to become high temperature air. The high-temperature and high-pressure air passes through the air superheater outlet stop valve 65, flows through the air superheater outlet pipe 17 and is injected into the solar heat pressurized boiler window box 69, and is used as high-temperature and high-pressure air for burning fossil fuel.

  Next, the solar thermal pressure boiler apparatus 300 will be described. The solar pressure boiler apparatus 300 of the present embodiment is a boiler installed in a pressure vessel (not shown) like a boiler device in a pressurized fluidized bed combined power plant, or the boiler itself is a pressure vessel. The combustion air is characterized by being high-temperature and high-pressure air superheated by solar thermal energy.

  The solar heat pressurization boiler apparatus 300 is provided with a solar heat pressurization boiler window box 69, and a fuel nozzle 70 is installed in the solar heat pressurization boiler window box 69.

  The boiler fuel flows down the fossil fuel supply pipe 68, mixes with the high temperature air in the fuel nozzle 70, is injected into the solar heat pressurization boiler 1, and burns in the solar heat pressurization boiler 1 using the high temperature high pressure air. As the boiler fuel, liquefied natural gas or fuel such as oil or coal is used.

  By this combustion, high-temperature and high-pressure combustion gas is produced, and the working fluid is heated / superheated by the solar-heated boiler evaporator 39 and the solar-heated boiler superheater 41 provided in the solar-heated boiler 1 to produce main steam. In addition, the working fluid is superheated by the solar pressure boiler reheater 24 to generate reheat steam.

  The high-pressure combustion gas after the heat exchange is introduced into the expansion gas turbine 2. The main steam from the solar pressure boiler superheater 41 passes through the main steam pipe 42 and is introduced into the high-pressure steam turbine 3. The reheat steam from the solar pressure boiler reheater 24 passes through the high temperature reheat pipe 44 and is introduced into the intermediate / low pressure steam turbine 25.

  In the solar pressure boiler apparatus 300 of the present embodiment, a superheater warmer is provided between the solar pressure boiler evaporator 39 and the solar pressure boiler superheater 41, and the superheater warmer is used as a steam turbine. The steam temperature to be supplied is adjusted, and a reheater warmer 30 is provided in the middle of the solar pressure boiler reheater 24, and the reheat steam supplied to the steam turbine by the superheater warmer. The temperature is adjusted. These steam temperature control systems change (decrease) the superheat in the air superheater 66 due to sudden changes in weather (for example, when the sunlight is interrupted), and fluctuate (decrease) the combustion gas temperature. This is effective for suppressing fluctuation (decrease) in the steam temperature, and particularly effective for a solar thermal power generation system that does not have a solar thermal storage device.

  The main steam temperature adjustment system is configured as follows. Steam discharged from the solar pressure boiler evaporator 39 through the pressurized solar boiler communication pipe 40 is controlled to be constantly reduced in the superheater desuperheater 28 (when the solar heat collector is in normal operation). The temperature (main steam temperature) of the steam (main steam) leaving the solar pressure boiler superheater 41 is constantly controlled by the spray water supplied from the superheater desuperheater spray adjustment valve 29 into the superheater desuperheater 28. Yes. The spray water passes through the superheater desuperheater spray pipe 54 at the outlet of the boiler feed pump 36 and is supplied to the superheater desuperheater spray adjustment valve 29.

  When the solar heat energy recovery amount fluctuates suddenly due to a sudden change in weather, it can be dealt with by spray control of the superheater desuperheater spray adjustment valve 29. That is, when the main steam temperature rapidly decreases due to fluctuations in the amount of recovered solar thermal energy, the superheater desuperheater spray adjustment valve 29 sprays so that the temperature decrease is stopped suddenly or the temperature decrease rate is rapidly decreased. Control the amount of water to decrease rapidly so that the main steam reaches the rated temperature. Further, with respect to fluctuations in solar thermal energy, after sudden fluctuations have settled, an operation for increasing / decreasing the amount of fuel input to the boiler is performed as necessary to adjust the power generation output.

  If the recovered amount of solar heat recovery energy changes suddenly due to sudden changes in the weather and the main steam temperature changes suddenly, there is a concern that a steam turbine damage accident may occur, but in this embodiment steam is reduced by rapidly decreasing the amount of spray water. Since the temperature is adjusted, there is no delay in the steam temperature response. Further, it is not necessary to burn new fossil fuel in order to keep the steam temperature constant.

  The reheat steam temperature adjustment system is similarly configured. That is, when the steam exiting from the solar pressure boiler reheater 24 passes through the reheater desuperheater 30, the temperature is always controlled by the reheater desuperheater spray adjustment valve 49 to recover the solar heat energy. When the amount fluctuates due to a sudden change in weather, it can be dealt with by spray control of the reheater desuperheater spray adjustment valve 49. The spray water passes through the boiler feed water pump intermediate stage spray pipe 52 of the boiler feed water pump 36 and is supplied to the reheater desuperheater spray adjustment valve 49.

  Next, the gas turbine power generation / compression device 400 will be described. The gas turbine power generation / compression device includes an expansion gas turbine 2, an air compressor 15, and a gas turbine generator 23.

  The high-temperature high-pressure gas produced in the solar pressure boiler 1 is cooled by exchanging heat with the working fluid flowing in the solar pressure boiler superheater 41, the pressurized solar boiler evaporator 39, etc., and becomes high-pressure intermediate-temperature gas, and solar pressure The gas flows through the boiler outlet gas pipe 18, passes through the expansion gas turbine inlet valve 67, and is introduced into the expansion gas turbine 2.

  The gas whose temperature has decreased by driving the expansion gas turbine 2 passes through the denitration device 26 to remove nitrogen oxides, and is further introduced into the gas turbine exhaust heat recovery unit 20. In the gas turbine exhaust heat recovery unit 20, heat is recovered by the condensate discharged from the low-pressure feed water heater 34 to lower the gas temperature, and then introduced into the desulfurization device 27. This desulfurization device 27 is required when burning fuel containing sulfur as a fossil fuel component such as petroleum or coal. This desulfurization device 27 is not necessary when burning a fuel that does not contain a sulfur component such as liquefied natural gas as a fossil fuel component. The gas that has passed through the desulfurizer outlet duct 21 passes through the chimney 22 and is discharged to the atmosphere.

  The air compressor 15 and the gas turbine generator 23 are driven by the expansion gas turbine 2. The air compressor 15 is configured as described above.

  Next, the steam turbine power generator 500 will be described. The steam turbine power generator 500 includes a steam turbine (the high-pressure steam turbine 3 and the medium / low-pressure steam turbine 25) and the steam turbine generator 31. The high-pressure steam turbine 3 and the medium / low-pressure steam turbine 25 are configured coaxially, and drive the steam turbine generator 31 to generate electric power.

  Steam generated in the solar pressure boiler 1 flows through the main steam pipe 42 and is introduced into the high-pressure steam turbine 3. The exhaust steam from the high-pressure steam turbine 3 flows through the low-temperature reheat pipe 43, and the steam is reheated by the solar pressure boiler reheater 24, flows down through the high-temperature reheat pipe 44, and is introduced into the medium-low pressure steam turbine 25.

  The exhaust steam from the intermediate / low pressure steam turbine 25 is discharged to the condenser 32 and cooled to return to the condensate. This condensate is pressurized by a condensate pump 33 and heated by a low-pressure feed water heater 34 and a gas turbine exhaust heat recovery unit 20 and enters a deaerator 35. The feed water leaving the deaerator 35 is boosted by the boiler feed pump 36 and sent to the high pressure feed water heater 37 through the high pressure feed water heater inlet feed pipe 53. The feed water heated by the high-pressure feed water heater 37 is led to the solar heat pressurized boiler evaporator 39 through the solar boiler feed water pipe 38.

  The extracted steam extracted from the intermediate / low pressure steam turbine 25 flows through the low pressure feed water heater heating pipe 55 and is led to the low pressure feed water heater 34 to heat the condensate at the outlet of the condensate pump 33, and then becomes a drain and the low pressure feed water heater drain pipe. It passes through 48 and flows into the condenser 32. Further, the extracted steam extracted from the intermediate / low pressure steam turbine 25 flows through the deaerator heating pipe 45 and flows down to the deaerator 35, joins the condensate, warms and degass the condensate, and the boiler feed pump 36. Flowing into.

  The extraction steam extracted from the high-pressure steam turbine 3 flows through the high-pressure feed water heater heating pipe 46, is led to the high-pressure feed water heater 37, heats the feed water at the outlet of the feed water pump 36, and then becomes drain and passes through the high-pressure feed water heater drain pipe 47. And flows to the condenser 32.

  According to the present embodiment, solar thermal energy that does not cost is recovered and used as superheated energy for combustion air of the solar heat pressurization boiler, and the high pressure exhaust gas of the solar heat pressurization boiler is used as the working fluid of the gas turbine. Therefore, it is possible to generate electricity by greatly reducing the amount of fossil fuel used. Furthermore, when fossil fuels such as liquefied natural gas are burned, sulfur oxides are not generated, and the amount of nitrogen oxides generated can be reduced by improving fuel consumption, thereby reducing the burden on the denitration device. Moreover, when burning fossil fuels, such as oil and coal, the burden of a desulfurization apparatus can be reduced. As a result, it is possible to provide a combined solar thermal power generation system capable of significantly reducing power generation costs.

  In addition, even if solar thermal energy fluctuates due to weather fluctuations, which is a weak point of solar thermal power generation, since solar thermal energy and fossil fuel energy are used in combination, stable solar thermal power generation is possible. In addition, since the present embodiment includes a system for adjusting the main steam temperature / reheat steam temperature by means of a solar heat storage device and / or a temperature reducer spray, even if a sudden change in solar thermal energy occurs due to a sudden change in weather. Stable solar power generation becomes possible. Further, in this embodiment, a solar heat storage device is provided (preferably also equipped with a main steam temperature / reheat steam temperature adjustment system by a temperature reducer spray), and the boiler is operated by a combination of solar heat energy and fossil fuel combustion energy. Therefore, even when the solar thermal energy cannot be recovered at night, the power generation can be continued while partially utilizing the solar heat, and the economical solar thermal power generation is possible.

  Moreover, since the supply destination of solar thermal energy is narrowed down to one place, as in Patent Document 3, the recovered solar thermal energy is divided and controlled to the gas turbine combustor side and the generated steam side of the gas turbine exhaust heat recovery boiler. Compared to the control system, there is no complication.

DESCRIPTION OF SYMBOLS 1 Solar pressure boiler 2 Expansion gas turbine 3 High pressure steam turbine 4 Solar heat collecting tower 5 Solar reflector (heliostat)
6 High-temperature heat medium heat storage tank 7 Low-temperature heat medium heat storage tank 8 High-temperature heat medium pipe 9 in the solar heat collecting tower 9 High-temperature heat medium air superheater inlet pipe 10 Low-temperature heat medium air superheater outlet pipe 11 Low-temperature heat medium heat tank outlet pipe 12 Air Inlet duct 13 Air compressor inlet valve 14 Air compressor inlet duct 15 Air compressor 16 Air superheater inlet pipe 17 Air superheater outlet pipe 18 Solar pressure boiler outlet gas pipe 19 Expansion turbine outlet duct 20 Gas turbine exhaust heat recovery unit 21 Desulfurizer outlet duct 22 Chimney 23 Gas turbine generator 24 Solar pressure boiler reheater 25 Medium / low pressure steam turbine 26 Denitration device 27 Desulfurization device 28 Superheater warmer 29 Superheater warmer spray adjustment valve 30 Reheater Desuperheater 31 Steam turbine generator 32 Condenser 33 Condensate pump 34 Low pressure feed water heater 35 Deaerator 36 Boiler feed pump 37 High pressure feed water heater 38 Solar pressure boiler feed pipe 39 Solar pressure boiler evaporator 40 Solar pressure boiler connection pipe 41 Solar pressure boiler superheater 42 Main steam pipe 43 Low temperature reheat pipe 44 High temperature reheat pipe 45 Deaerator Heating pipe 46 High pressure feed water heater heating pipe 47 High pressure feed water heater drain pipe 48 Low pressure feed water heater drain pipe 49 Reheater desuperheater spray adjustment valve 50 High temperature heat medium air superheater inlet valve 51 Low temperature heat medium air superheater outlet Valve 52 Boiler feed pump intermediate stage spray pipe 53 High pressure feed water heater inlet feed pipe 54 Superheater desuperheater spray pipe 55 Low pressure feed water heater heating pipe 60 Sun 61 Sunlight 62 Sunlight reflected light 63 Solar heat collector 64 Air superheat Inlet stop valve 65 air superheater outlet stop valve 66 air superheater 67 expansion gas turbine inlet valve 68 fossil fuel supply piping 69 solar pressure Ira windbox 70 fuel nozzle 71 air superheater heat transfer pipe 100 solar heat collector 200 air superheater 300 solar pressure boiler apparatus 400 gas turbine power generation and compression apparatus 500 steam turbine power generation system

Claims (11)

  A solar heat collector, an air superheater using a heat medium collected by the solar heat collector as a heating medium, an air compressor supplying compressed air as a heated medium to the air superheater, and the air compressor A gas turbine that drives the gas turbine, a gas turbine generator driven by the gas turbine, and compressed air heated by the air superheater is introduced as combustion air to burn fossil fuel, and steam is generated by the combustion gas And a pressurized boiler for supplying combustion exhaust gas to the gas turbine, a steam turbine for introducing steam generated in the pressurized boiler, and a generator driven by the steam turbine. system. In the solar thermal combined power generation system according to claim 1,
A solar combined power generation system, wherein a temperature reducer is provided between an evaporator and a superheater of the pressurized boiler, and the steam temperature supplied to the steam turbine is adjusted by the temperature reducer. In the solar thermal combined power generation system according to claim 1,
A high-pressure steam turbine and a medium-low pressure steam turbine as the steam turbine;
A main steam temperature reducer to be supplied to the high pressure steam turbine is provided between the evaporator and superheater of the pressurized boiler, and the steam temperature to be supplied to the high pressure steam turbine is adjusted by the main steam temperature reducer,
A reheat steam cooler to be supplied to the intermediate / low pressure steam turbine is provided in the middle of the reheater of the pressurized boiler, and the steam temperature supplied to the intermediate / low pressure steam turbine is adjusted by the reheat steam cooler. A combined solar thermal power generation system characterized by that. In the solar thermal combined power generation system according to claim 1,
The solar heat collector has a solar heat collector and a heat storage device that stores solar heat collected by the solar heat collector. In the solar thermal combined power generation system according to claim 1,
A temperature reducer is provided between the evaporator and the superheater of the pressurized boiler, and the steam temperature supplied to the steam turbine is adjusted by the temperature reducer,
The solar heat collector has a solar heat collector and a heat storage device that stores solar heat collected by the solar heat collector. In the solar thermal combined power generation system according to claim 1,
A combined solar heat power generation system characterized in that a compressor inlet valve having a function of restricting the amount of air suction is provided at the inlet of the air compressor. In the solar thermal combined power generation system according to claim 1,
The air superheater includes a heat transfer tube that heats a heat medium from the solar heat collecting device into a tube and superheats compressed air from the air compressor that flows out of the tube.   The compressed combustion air is superheated with solar heat energy and introduced into the pressurized boiler, and the boiler fuel is burned with the compressed and superheated combustion air to generate high-temperature and high-pressure gas, and steam is generated with this high-temperature and high-pressure gas. A compressor that supplies a steam turbine to drive a steam turbine generator, introduces a medium-temperature high-pressure gas cooled by heat exchange with the pressurized boiler into the gas turbine, and compresses the combustion air of the boiler by the gas turbine And a solar turbine combined power generation method characterized by driving a gas turbine generator In the solar thermal combined power generation method according to claim 8,
During normal operation, the steam generated in the evaporator is always reduced in temperature between the evaporator and superheater of the pressurized boiler, and when the solar thermal energy is suddenly reduced due to sudden weather change, the temperature reduction is stopped or reduced. A solar combined power generation method, wherein a temperature ratio is reduced to suppress fluctuations in the temperature of steam supplied from the superheater to the steam turbine. In the solar thermal combined power generation method according to claim 8,
Storing the solar thermal energy in a heat storage device;
In a time zone in which solar thermal energy cannot be utilized, the solar thermal combined power generation method is characterized in that solar thermal energy in the heat storage device is taken out and the combustion air is overheated. In the solar thermal combined power generation method according to claim 10,
During normal operation, the steam generated in the evaporator is always reduced in temperature between the evaporator and superheater of the pressurized boiler, and the temperature reduction is stopped or reduced in a time period during which the solar thermal energy cannot be utilized. A solar combined power generation method characterized in that the solar combined power generation is continued by decreasing the temperature ratio.

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