CN215490405U - Solar energy-gas combined cycle power generation system - Google Patents

Solar energy-gas combined cycle power generation system Download PDF

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CN215490405U
CN215490405U CN202122047121.XU CN202122047121U CN215490405U CN 215490405 U CN215490405 U CN 215490405U CN 202122047121 U CN202122047121 U CN 202122047121U CN 215490405 U CN215490405 U CN 215490405U
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pressure
steam
low
solar
gas
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曹勇
安欣
张开鹏
王勇刚
唐伟
杨光锐
李继福
曲广浩
吴猛
刘炎伟
何未雨
李钊
吴晋
张海龙
王邦行
杨明强
王嘉琦
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Xian Thermal Power Research Institute Co Ltd
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Xian Thermal Power Research Institute Co Ltd
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    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00Energy generation through renewable energy sources
    • Y02E10/40Solar thermal energy, e.g. solar towers
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E20/00Combustion technologies with mitigation potential
    • Y02E20/16Combined cycle power plant [CCPP], or combined cycle gas turbine [CCGT]
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E20/00Combustion technologies with mitigation potential
    • Y02E20/30Technologies for a more efficient combustion or heat usage

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Abstract

A solar energy-gas combined cycle power generation system comprises a gas-steam combined cycle subsystem and a solar energy direct steam subsystem. The gas-steam combined cycle subsystem comprises a gas turbine, a waste heat boiler, a steam turbine set and a water feed pump set, and the solar direct steam subsystem comprises a groove type solar heat collection preheating area, a heat collection evaporation area, a heat collection overheating area, a circulating pump and a steam-water separator. Exhaust gas of the gas turbine heats feed water of a high-pressure part of the waste heat boiler to generate high-pressure steam, the feed water of a low-pressure part can reach saturation temperature through the evaporator and the solar heat collector after being preheated, and the tail hot water heater heats feed water of an inlet of a preheating area of the solar heat collector to reduce the exhaust gas temperature of the waste heat boiler. The utility model not only improves the heat exchange efficiency of the waste heat boiler, but also improves the utilization efficiency of energy, and can flexibly change the operation mode to achieve the stable operation of the unit according to the change of the direct solar radiation intensity, thereby realizing the multi-energy complementation and the cascade utilization.

Description

Solar energy-gas combined cycle power generation system
Technical Field
The utility model relates to the technical field of power generation equipment, in particular to a solar energy-gas combined cycle power generation system.
Background
Solar energy is inexhaustible clean energy and has very wide development prospect. Solar thermal power generation has been developed to various degrees around the world, but its large-scale commercial application has been hampered due to solar energy discontinuity and instability. The gas-steam combined cycle power generation is a clean energy power generation mode, has small environmental pollution, short construction period and reliable and stable operation, and the core equipment of the gas-steam combined cycle is a gas turbine which is very stable in operation but has larger influence on the performance by environmental factors. In order to improve the thermal efficiency of the gas-steam combined cycle, the exhaust gas temperature of the waste heat boiler can be reduced as far as possible within a certain range. The two energy utilization forms have certain defects, and the complementary power generation form can effectively reduce the influence of high-temperature weather on the output of the unit and also can enable the unit to generate power continuously and stably.
The utilization of single energy variety is subject to multi-directional elbow, so in the future development process, it is a great trend to build a comprehensive energy system with multiple energy sources organically integrated and complemented.
SUMMERY OF THE UTILITY MODEL
The utility model aims to provide a solar energy-gas combined cycle power generation system, which is an energy complementary power generation mode, and improves the operation performance of the system by replacing an evaporator of a waste heat boiler with a solar heat collection field and utilizing a boiler tail heater as a solar heat collection preheating mode, and the mode can effectively improve the heat exchange efficiency of the waste heat boiler and the continuous stability of solar power generation.
In order to achieve the purpose, the utility model adopts the following technical scheme:
a solar energy-gas combined cycle power generation system comprises a gas-steam combined cycle power generation electronic system and a solar energy direct steam subsystem, wherein the two subsystems are connected through a pipeline;
the gas-steam combined cycle power generation subsystem comprises a gas turbine, a gas turbine generator, a waste heat boiler, a condenser, a steam turbine generator, a condensate pump and a high-pressure water feed pump;
the gas turbine compressor is used for absorbing air from the outside atmosphere and compressing the air, the compressed air is mixed with fuel sprayed into a combustion chamber and then is combusted, the generated high-temperature and high-pressure flue gas enters the gas turbine to do work to drive the compressor to rotate and a gas turbine generator to generate electricity, the exhaust gas of the gas turbine enters the waste heat boiler and is discharged to the atmosphere through a chimney through a high-pressure superheater, a high-pressure evaporator, a high-pressure economizer, a low-pressure superheater, a low-pressure evaporator, a low-pressure economizer and a tail heat exchanger of the waste heat boiler respectively; high-pressure heat exchange steam generated in the high-pressure heat exchange area directly enters a high-pressure cylinder of a steam turbine to do work, and feed water in the low-pressure heat exchange area can enter a low-pressure evaporator or a heat collection evaporation area of a solar direct steam system through a low-pressure steam pocket after passing through a low-pressure economizer to generate low-pressure superheated steam; the tail heat exchanger preheats the feed water to 80-90 ℃ and then supplies the feed water to a heat collection preheating area of solar direct steam; the high-pressure water feeding pump is connected with the low-pressure steam pocket, and the high-pressure water feeding pump boosts the pressure of water in the low-pressure steam pocket and supplies the water to the high-pressure economizer;
the solar direct steam subsystem comprises a heat collection preheating area, a heat collection evaporation area, a steam-water separator, a circulating pump and a heat collection overheating area; the feed water of the heat collection preheating zone comes from an outlet of a hot water heat exchanger of the waste heat boiler, the feed water enters the heat collection evaporation zone to reach saturation temperature after being preheated, then is separated by a steam-water separator, the saturated water returns to the heat collection evaporation zone through a circulating pump to be heated continuously, the separated saturated steam generates low-pressure superheated steam after passing through the heat collection superheating zone, the low-pressure superheated steam generated by the solar direct steam system and the low-pressure superheated steam generated by the waste heat boiler are combined and then enter a low-pressure superheated steam header, and the low-pressure superheated steam and the exhaust steam of the high-pressure cylinder are mixed and then enter a low-pressure cylinder of a steam turbine to do work; the exhaust steam of the low pressure cylinder enters a condenser, and condensed water is supplied to a low pressure economizer and a hot water heat exchanger of the waste heat boiler after passing through a condensate pump, so that a thermodynamic cycle is achieved.
The utility model has the further improvement that the waste heat boiler is in double-pressure natural circulation, and the parameters of the low-pressure superheated steam generated by the low-pressure heat exchange area of the waste heat boiler are matched with the parameters of the superheated steam generated by the solar direct steam system.
The utility model is further improved in that a heat collection evaporation area of a solar direct steam system is used for replacing a low-pressure evaporator of a waste heat boiler.
The utility model has the further improvement that a hot water heater is additionally arranged at the tail part of the waste heat boiler to heat the feed water of the solar heat collection preheating area, so that the heat exchange efficiency of the waste heat boiler is improved, and the investment of the solar heat collection preheating area can be reduced.
The solar direct steam system is further improved in that a groove type heat collector is adopted by the solar direct steam system, and a groove type solar heat collection field is divided into a preheating area, an evaporation area and a superheating area according to different heat collection temperatures.
The utility model has the further improvement that after the waste heat boiler low-pressure evaporator is put into the solar heat collection field, the waste heat boiler low-pressure evaporator is completely or partially replaced, at the moment, the temperature of the flue gas is unchanged or partially reduced when the flue gas flows through the low-pressure evaporator, and water vapor with saturated temperature generated by the low-pressure evaporator and the solar heat collection field enters the low-pressure steam pocket for steam-water separation.
The utility model has the further improvement that the tail heater of the waste heat boiler heats the condensed water to 80-90 ℃, the temperature of the condensed water is close to the exhaust gas temperature of the waste heat boiler, and the condensed water is used as the feed water of the preheating area of the solar heat collection field after being heated.
The utility model has the further improvement that the steam-water mixture in the evaporation area of the solar heat collection field passes through a steam-water separator, the separated water enters the overheating area of the heat collection field, and the separated water returns to the evaporation area through a circulating pump.
The utility model is further improved in that the waste heat boiler is in a double-pressure horizontal natural circulation mode.
The utility model has at least the following beneficial technical effects:
1. solar energy and gas are complementary, and compared with single solar power generation, the power station can continuously operate under the condition of not increasing energy storage, so that the stability of the unit is effectively improved; compared with single gas power generation, solar power generation is increased, and the power generation power of clean energy is improved.
2. The two energy sources are coupled through the waste heat boiler, the solar heat collection is utilized to replace a low-pressure evaporator of the waste heat boiler, and the operation is flexible and reliable.
3. The solar heat collection water supply is heated by the heater at the tail of the waste heat boiler, so that on one hand, the exhaust gas temperature of the waste heat boiler is reduced, and the heat exchange efficiency of the waste heat boiler is further improved; on the other hand, the investment of a solar heat collection preheating area is also reduced.
Drawings
FIG. 1 is a schematic diagram of a solar-gas combined cycle power generation system of the present invention.
Description of reference numerals:
1. the system comprises a compressor, 2, a combustion chamber, 3, a gas turbine, 4, a gas turbine generator, 5, a high-pressure superheater, 6, a high-pressure evaporator, 7, a high-pressure economizer, 8, a high-pressure steam pocket, 9, a low-pressure superheater, 10, a low-pressure evaporator, 11, a low-pressure economizer, 12, a low-pressure steam pocket, 13, a high-pressure water feed pump, 14, a tail heat exchanger, 15, a heat collection preheating zone, 16, a heat collection evaporation zone, 17, a steam-water separator, 18, a circulating pump, 19, a heat collection overheating zone, 20, a condenser, 21, a low-pressure steam main pipe, 22, a steam turbine high-pressure cylinder, 23, a steam turbine low-pressure cylinder, 24, a steam turbine generator, 25 and a condensate pump.
Detailed Description
The following further describes embodiments of the present invention with reference to the drawings.
Referring to the attached figure 1, the utility model aims to establish an energy utilization form of solar energy and gas-steam combined cycle complementation, and aims to solve the utilization form of single energy, increase the complementation utilization of clean energy and improve the efficiency and the continuity of system operation.
In order to achieve the purpose, the solar energy-gas combined cycle power generation system provided by the utility model comprises a gas turbine generator set consisting of a gas compressor 1, a combustion chamber 2, a gas turbine 3 and a gas turbine generator 4. The waste heat boiler consists of a high-pressure superheater 5, a high-pressure evaporator 6, a high-pressure economizer 7, a high-pressure steam drum 8, a high-pressure water feeding pump 13, a low-pressure superheater 9, a low-pressure evaporator 10, a low-pressure economizer 11, a low-pressure steam drum 12 and a tail heat exchanger 14. The solar direct steam system consists of a heat collection preheating area 15, a heat collection evaporation area 16, a steam-water separator 17, a circulating pump 18 and a heat collection overheating area 19. The equipment of the steam turbine generator unit comprises a condenser 20, a low-pressure steam main pipe 21, a high-pressure steam turbine cylinder 22, a low-pressure steam turbine cylinder 23, a steam turbine generator 24 and a condensate pump 25.
The waste heat boiler high-pressure superheated steam is connected with a high-pressure cylinder of a steam turbine through a high-pressure steam pipeline, the low-pressure superheated steam of the waste heat boiler, the solar heat collection superheated steam and the high-pressure cylinder exhaust steam are connected with a low-pressure steam main pipe through a low-pressure steam pipeline, and the low-pressure steam main pipe enters a low-pressure cylinder of the steam turbine through a steam pipeline. And the high-pressure cylinder and the low-pressure cylinder of the steam turbine do work and then drive the steam turbine generator.
The exhaust gas temperature of the gas turbine is above 540 ℃, the temperature of the high-pressure superheated steam is 500 ℃, and the pressure is 5 MPa. The temperature of the low-pressure superheated steam is 200 ℃, the pressure is 0.5MPa, and the outlet temperature of the tail heat exchanger is 80 ℃. The outlet pressure of the condensate pump is 1MPa, and the outlet pressure of the high-pressure feed pump is 5.9 MPa.
The use and method of the system is further described below: in rainy days or nights, the solar illumination intensity is insufficient, the heat collection temperature cannot meet the design requirement, and the solar heat collection field cannot be put into operation. At the moment, the unit is required to cut off the connection between the water supply and the tail heat exchanger and the connection between the solar heat collection overheating area and the low-pressure steam main pipe, and the gas-steam combined cycle unit continues to operate. When the unit is started. The method comprises the following steps of firstly starting a gas turbine, introducing exhaust gas into a waste heat boiler, slowly raising the temperature and boosting the pressure of the waste heat boiler after the gas turbine is stabilized at a low load, increasing the load of a gas turbine after a certain pressure is reached, and slowly increasing the parameters of the waste heat boiler to reach a rated value. Secondly, in the process of heating and boosting the temperature of the waste heat boiler, high-pressure and low-pressure superheated steam is required to go to a condenser through a bypass system, the bypass is slowly closed after the temperature and the pressure reach rated values, and main steam enters a steam turbine to do work. And finally, after all the parameters reach the rated working value, loading the gas turbine, and coordinately increasing the load of the gas turbine to the rated value.
When the direct solar radiation intensity reaches the minimum required value after the gas-steam combined cycle unit is stabilized, the condensed water is gradually started to the heat collection preheating area of the solar field according to the radiation intensity, and the water supply flow of the heat collection field is adjusted according to the parameter change of the heat collection superheated steam. The outlet of the low-pressure economizer of the waste heat boiler is slowly opened to the solar heat collection evaporation area, and the inlet flow and the outlet flow are adjusted according to the outlet parameters of the heat collection evaporation area.
The utility model aims to provide a method, and specific unit start-stop and operation strategies, wherein relevant knowledge is well known to professional technicians.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and equivalent alternatives or modifications according to the technical solution of the present invention and the inventive concept thereof should be covered by the scope of the present invention.

Claims (6)

1. A solar energy-gas combined cycle power generation system is characterized by comprising a gas-steam combined cycle power generation electronic system and a solar energy direct steam subsystem, wherein the two subsystems are connected through a pipeline;
the gas-steam combined cycle power generation subsystem comprises a gas turbine, a gas turbine generator, a waste heat boiler, a condenser, a steam turbine generator, a condensate pump and a high-pressure water feed pump;
the gas turbine compressor is used for absorbing air from the outside atmosphere and compressing the air, the compressed air is mixed with fuel sprayed into a combustion chamber and then is combusted, the generated high-temperature and high-pressure flue gas enters the gas turbine to do work to drive the compressor to rotate and a gas turbine generator to generate electricity, the exhaust gas of the gas turbine enters the waste heat boiler and is discharged to the atmosphere through a chimney through a high-pressure superheater, a high-pressure evaporator, a high-pressure economizer, a low-pressure superheater, a low-pressure evaporator, a low-pressure economizer and a tail heat exchanger of the waste heat boiler respectively; high-pressure heat exchange steam generated in the high-pressure heat exchange area directly enters a high-pressure cylinder of a steam turbine to do work, and feed water in the low-pressure heat exchange area can enter a low-pressure evaporator or a heat collection evaporation area of a solar direct steam system through a low-pressure steam pocket after passing through a low-pressure economizer to generate low-pressure superheated steam; the tail heat exchanger preheats the feed water to 80-90 ℃ and then supplies the feed water to a heat collection preheating area of solar direct steam; the high-pressure water feeding pump is connected with the low-pressure steam pocket, and the high-pressure water feeding pump boosts the pressure of water in the low-pressure steam pocket and supplies the water to the high-pressure economizer;
the solar direct steam subsystem comprises a heat collection preheating area, a heat collection evaporation area, a steam-water separator, a circulating pump and a heat collection overheating area; the feed water of the heat collection preheating zone comes from an outlet of a hot water heat exchanger of the waste heat boiler, the feed water enters the heat collection evaporation zone to reach saturation temperature after being preheated, then is separated by a steam-water separator, the saturated water returns to the heat collection evaporation zone through a circulating pump to be heated continuously, the separated saturated steam generates low-pressure superheated steam after passing through the heat collection superheating zone, the low-pressure superheated steam generated by the solar direct steam system and the low-pressure superheated steam generated by the waste heat boiler are combined and then enter a low-pressure superheated steam header, and the low-pressure superheated steam and the exhaust steam of the high-pressure cylinder are mixed and then enter a low-pressure cylinder of a steam turbine to do work; the exhaust steam of the low pressure cylinder enters a condenser, and condensed water is supplied to a low pressure economizer and a hot water heat exchanger of the waste heat boiler after passing through a condensate pump, so that a thermodynamic cycle is achieved.
2. The solar-gas combined cycle power generation system of claim 1, wherein the exhaust-heat boiler is a dual-pressure natural cycle, and the parameters of the low-pressure superheated steam generated by the low-pressure heat exchange area of the exhaust-heat boiler are matched with the parameters of the superheated steam generated by the solar direct steam system.
3. The solar-gas combined cycle power generation system of claim 1, wherein the low pressure evaporator of the waste heat boiler is replaced with a heat collection evaporation zone of a solar direct steam system.
4. The solar-gas combined cycle power generation system of claim 1, wherein a hot water heater is additionally installed at the rear of the exhaust-heat boiler to heat the feed water of the solar heat collecting preheating zone, so as to improve the heat exchange efficiency of the exhaust-heat boiler and reduce the investment of the solar heat collecting preheating zone.
5. The solar-gas combined cycle power generation system of claim 1, wherein the solar direct steam system employs a trough collector, and the trough solar heat collection field is divided into a preheating zone, an evaporation zone and a superheating zone according to different heat collection temperatures.
6. The solar-gas combined cycle power generation system of claim 1, wherein the waste heat boiler is in a dual pressure, horizontal, natural circulation form.
CN202122047121.XU 2021-08-27 2021-08-27 Solar energy-gas combined cycle power generation system Active CN215490405U (en)

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CN202122047121.XU CN215490405U (en) 2021-08-27 2021-08-27 Solar energy-gas combined cycle power generation system

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Application Number Priority Date Filing Date Title
CN202122047121.XU CN215490405U (en) 2021-08-27 2021-08-27 Solar energy-gas combined cycle power generation system

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CN215490405U true CN215490405U (en) 2022-01-11

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