CN111749862A - Mixture working medium supercritical Brayton cycle photo-thermal power generation system and power generation method - Google Patents
Mixture working medium supercritical Brayton cycle photo-thermal power generation system and power generation method Download PDFInfo
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- 238000010248 power generation Methods 0.000 title claims abstract description 61
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- 239000002245 particle Substances 0.000 claims description 127
- 239000007787 solid Substances 0.000 claims description 25
- 238000001816 cooling Methods 0.000 claims description 9
- 239000012530 fluid Substances 0.000 claims description 6
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- 230000009286 beneficial effect Effects 0.000 description 1
- 239000003054 catalyst Substances 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
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- 238000010586 diagram Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
- F03G—SPRING, WEIGHT, INERTIA OR LIKE MOTORS; MECHANICAL-POWER PRODUCING DEVICES OR MECHANISMS, NOT OTHERWISE PROVIDED FOR OR USING ENERGY SOURCES NOT OTHERWISE PROVIDED FOR
- F03G6/00—Devices for producing mechanical power from solar energy
- F03G6/06—Devices for producing mechanical power from solar energy with solar energy concentrating means
- F03G6/065—Devices for producing mechanical power from solar energy with solar energy concentrating means having a Rankine cycle
- F03G6/067—Binary cycle plants where the fluid from the solar collector heats the working fluid via a heat exchanger
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
- F01K25/00—Plants or engines characterised by use of special working fluids, not otherwise provided for; Plants operating in closed cycles and not otherwise provided for
- F01K25/06—Plants or engines characterised by use of special working fluids, not otherwise provided for; Plants operating in closed cycles and not otherwise provided for using mixtures of different fluids
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
- F01K25/00—Plants or engines characterised by use of special working fluids, not otherwise provided for; Plants operating in closed cycles and not otherwise provided for
- F01K25/08—Plants or engines characterised by use of special working fluids, not otherwise provided for; Plants operating in closed cycles and not otherwise provided for using special vapours
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24S—SOLAR HEAT COLLECTORS; SOLAR HEAT SYSTEMS
- F24S10/00—Solar heat collectors using working fluids
- F24S10/30—Solar heat collectors using working fluids with means for exchanging heat between two or more working fluids
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24S—SOLAR HEAT COLLECTORS; SOLAR HEAT SYSTEMS
- F24S23/00—Arrangements for concentrating solar-rays for solar heat collectors
- F24S23/70—Arrangements for concentrating solar-rays for solar heat collectors with reflectors
- F24S23/77—Arrangements for concentrating solar-rays for solar heat collectors with reflectors with flat reflective plates
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24S—SOLAR HEAT COLLECTORS; SOLAR HEAT SYSTEMS
- F24S60/00—Arrangements for storing heat collected by solar heat collectors
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- Y—GENERAL 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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/40—Solar thermal energy, e.g. solar towers
- Y02E10/44—Heat exchange systems
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- Y—GENERAL 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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/40—Solar thermal energy, e.g. solar towers
- Y02E10/46—Conversion of thermal power into mechanical power, e.g. Rankine, Stirling or solar thermal engines
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Abstract
The invention discloses a mixture working medium supercritical Brayton cycle photo-thermal power generation system and a power generation method2And SF6The mixture working medium power cycle power generation subsystem; the invention uses supercritical CO2And SF6The mixture is used as working medium, and when the temperature of the working medium at the inlet of the main compressor in the photo-thermal power generation system deviates from the supercritical CO2When the critical temperature is higher, the reaction can be remarkably improvedThe power generation efficiency of the high photothermal power generation system. In addition, the particle-sCO inlet is regulated by a shunt control valve during the operation of the circulation system2The working medium flow in the heat exchanger can effectively solve the problem of particle-sCO in the system2The heat exchanger can control the temperature of the working medium at the inlet of the turbine, and the operation efficiency and the peak regulation flexibility of the whole photo-thermal power generation system are obviously improved.
Description
Technical Field
The invention belongs to the technical field of advanced high-efficiency photo-thermal power generation, and particularly relates to a method for generating electricity by using CO2And SF6A supercritical Brayton cycle photo-thermal power generation system and a power generation method using a mixture as a working medium.
Background
The active development of the solar thermal power generation technology can not only reduce the dependence on fossil energy such as coal, but also fully exert the advantages of low-cost and high-efficiency heat storage, adjustable and controllable output and the like, realize the friendly development of network resources and greatly improve the capability of a power grid for absorbing renewable energy. Therefore, as a flexible peak-shaving power source, the photo-thermal power generation is considered to be the most clean energy source which can replace the traditional thermal power generation, and the development of renewable energy sources is an important direction.
How to improve the efficiency of the power cycle system for the photo-thermal power generation is the key for further reducing the cost of the photo-thermal power generation. At present, two technical routes are mainly involved: firstly, a heat collection technology with a higher temperature grade is developed, the highest temperature in the power cycle system is further improved, and the heat efficiency of the power cycle system is improved, for example, the existing relatively popular photo-thermal power generation technology based on solid particle heat collection; the other is to develop a more advanced and efficient power cycle system to replace the steam Rankine cycle system which is widely applied at present, such as the supercritical CO which is being researched and researched internationally2Brayton cycle systems. As can be imagined, photo-thermal supercritical CO based on particle heat collection2The Brayton cycle power generation system inevitably becomes an important development direction of the future photo-thermal power generation technology, and becomes a research hotspot in the field at home and abroad at present.
It is well known for supercritical CO2In the case of a cycle power generation system, the high efficiency advantage of the cycle is mainly benefited by a compressor in CO2When the compression is carried out near the critical point, the compression power consumption is obviously reduced, so that the system cycle thermal efficiency is obviously improved. Supercritical CO when compressor inlet temperature deviates from critical point temperature2The efficiency of the cycle power generation system is reduced sharply, and the high efficiency advantage possessed by the cycle power generation system is no longer existed. For example, recompression of supercritical CO for a certain split stream2And when the inlet temperature of the main compressor is changed from 32 ℃ to 45 ℃, the heat efficiency of the circulating system is remarkably reduced and is reduced from 50.07 percent to 44.25 percent. However, in general, areas with abundant photo-thermal resources are often located in arid and severe water-deficient areas such as deserts. For these areas, photo-thermal supercritical CO is developed and constructed2When the power generation system is circulated, air dry cooling is the only option. However, the average ambient temperature in these areas is high and can reach 35-45 ℃ in summer, and how to solve the problem of supercritical CO2High efficiency of the recycle system and difficulty in cooling the compressor inlet temperature to CO2The contradiction between the critical temperatures is a major technical difficulty faced at present.
Furthermore, the particles-sCO2The heat exchanger is used as an important key device for connecting solar heat input and power circulation in a particle heat collection-based photo-thermal power generation system, and how to ensure that the particle outlet temperature of the heat exchanger and the working medium temperature of the turbine inlet reach set values and stably operate the heat exchanger directly influences the whole photo-thermal sCO in the operation process2The main factors of the operation efficiency and the peak regulation flexibility of the circulating power generation system. To date, it has been aimed at how to solve the particle-sCO2The control problem of the heat exchanger to ensure that the temperature of the particle outlet of the heat exchanger and the temperature of the working medium at the inlet of the turbine reach set values and the stable operation is not reported in public.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a method for preparing CO2And SF6Supercritical Brayton cycle photo-thermal power generation system and method with mixture as working medium, wherein supercritical CO is used in the system2And SF6The mixture is a circulating working medium due to SF6Critical point temperature (45.57 ℃) of (C) to CO2Has a high critical point temperature (30.98 ℃), SF6Can improve the critical point temperature of the mixture working medium, thereby well solving the problem of conventional supercritical CO2High efficiency of the recycle system and difficulty in cooling the compressor inlet temperature to CO2The contradiction between the critical temperatures of (a). Furthermore, the system is in particle-sCO2The inlet and outlet of working medium side of heat exchanger are respectively led into a shunt control valve and a mixer, and the particles-sCO are regulated and enter through the shunt control valve in the actual operation process2Working medium flow in the heat exchanger, thereby well solving the problem of particle-sCO in the system2The heat exchanger effectively controls the temperature of the working medium at the inlet of the turbine, and obviously improves the whole photo-thermal sCO2The operation efficiency and the peak regulation flexibility of the circulating power generation system are improved.
In order to achieve the purpose, the invention adopts the following technical scheme:
a supercritical Brayton cycle photo-thermal power generation system with mixture working medium comprises a photo-thermal heat source input subsystem and supercritical CO2And SF6The mixture working medium power cycle power generation subsystem;
the photo-thermal heat source input subsystem comprises a mirror field 1, a particle heat collector 2, a hot tank 3, a cold tank 4 and particles/s-CO2The heat exchanger 5 is used for projecting radiant heat from solar irradiation onto the particle heat collector 2 after being focused by the mirror field 1, a particle outlet of the cold tank 4 is communicated with a particle inlet of the particle heat collector 2, a particle outlet of the particle heat collector 2 is communicated with a particle inlet of the hot tank 3, and a particle outlet of the hot tank 3 is communicated with particles/s-CO2The particle inlets of the heat exchangers 5 are communicated with each other, and the particles/s-CO are2The particle outlet of the heat exchanger 5 is communicated with the particle inlet of the cold tank 4;
the supercritical CO2And SF6The mixture working medium power cycle power generation subsystem adopts supercritical CO2And SF6Working fluid mixture, including particles/s-CO2Heat exchanger 5, flow dividing control valve 6, mixer 7, turbine 8, high temperature regenerator 9, low temperature regenerator 10, recompressor 11, precooler 12 and main compressor13; the outlet of the low temperature heat regenerator 10 at the hot side is divided into two paths, wherein one path is communicated with the inlet of a main compressor 13 through a precooler 12, the outlet of the main compressor 13 is communicated with the inlet of the low temperature heat regenerator 10 at the cold side, the other path is communicated with the inlet of a recompressor 11, the outlet of the recompressor 11 and the outlet of the low temperature heat regenerator 10 at the cold side are communicated with the inlet of a high temperature heat regenerator 9 after being combined into a pipe through a pipeline, the outlet of the high temperature heat regenerator 9 at the cold side is communicated with the inlet of a shunt control valve 6, one outlet of the shunt control valve 6 is communicated with particles/2The working medium inlet of the heat exchanger 5 is communicated with the inlet of the particles/s-CO2Supercritical CO of Heat exchanger 52And SF6The mixture working medium absorbs the heat released by the high-temperature solid particles and passes through the particles/s-CO2The mixed working medium from the other outlet of the flow dividing control valve 6 and the working medium outlet of the heat exchanger 5 are mixed by the mixer 7 and then enter the turbine 8 to do work and generate power, the working medium outlet of the turbine 8 is communicated with the hot side inlet of the high-temperature heat regenerator 9, and the hot side outlet of the high-temperature heat regenerator 9 is communicated with the hot side inlet of the low-temperature heat regenerator 10.
Supercritical CO2And SF6SF in mixture working fluid6In the range of 0.25 to 0.55, there exists an optimum value, and the determination of the specific optimum value is determined by optimization calculation according to the design boundary conditions of the system.
In particles/s-CO2A working medium inlet pipeline of the heat exchanger 5 is provided with a flow distribution control valve 6, and the inlet particles/s-CO are changed by adjusting the flow distribution control valve 62The mixture working medium flow in the heat exchanger 5 realizes the effective control of the temperature of the working medium at the inlet of the turbine 8.
According to the photo-thermal power generation method of the mixture working medium supercritical Brayton cycle photo-thermal power generation system, low-temperature solid particles from the cold tank 4 become high-temperature solid particles after absorbing focused solar radiation heat in the particle heat collector 2, the high-temperature solid particles enter the hot tank 3 and are stored for later use, and when supercritical CO is used2And SF6When the mixture working medium power cycle power generation subsystem needs to generate power, the high-temperature solid particles stored in the hot tank 3 enter the particles/s-CO through the particle outlet of the hot tank 32Particle inlet of heat exchanger 5 at particle/s-CO2In the heat exchanger 5, high-temperature solid particles and supercritical CO2And SF6The mixture working medium exchanges heat to input heat into the supercritical CO2And SF6In the mixture working medium power cycle power generation subsystem, the low-temperature solid particles completing heat exchange pass through particles/s-CO2The particle outlet of the heat exchanger 5 enters the particle inlet of the cold tank 4 and enters the cold tank 4 for storage so as to carry out the next heat absorption cycle process; supercritical CO from high temperature regenerator 92And SF6The mixture working medium is divided into two paths by a shunt control valve 6, and one path enters into particles/s-CO2The heat exchanger 5 absorbs heat of high-temperature solid particles and then enters the mixer 7, the other path of heat directly enters the mixer 7 to be mixed and converged and then enters the turbine 8 to do work externally to generate power, and the work done by the supercritical CO is completed2And SF6The mixture working medium sequentially enters the high-temperature heat regenerator 9 and the low-temperature heat regenerator 10 to release heat and then is divided into two paths, wherein one path enters the main compressor 13 to be compressed after being cooled by the precooler 12, then enters the low-temperature heat regenerator 10 to absorb heat and then flows out from the cold side outlet of the low-temperature heat regenerator 10, and the other path directly enters the hypercritical CO which flows out from the cold side outlet of the low-temperature heat regenerator 10 after being compressed by the recompressor 112And SF6The mixture working medium is mixed and converged and then enters the high-temperature heat regenerator 9 to absorb heat.
The photo-thermal power generation method adopts supercritical CO2And SF6The critical temperature of the mixture working medium is increased, and the supercritical CO is effectively solved2High efficiency of the recycle system and difficulty in cooling the compressor inlet temperature to CO2The problem of contradiction between critical temperatures of; in particles/s-CO2A working medium inlet pipeline of the heat exchanger 5 is provided with a flow distribution control valve 6, and particles/s-CO can enter by adjusting the flow distribution control valve 62The flow of the mixture working medium in the heat exchanger 5 is changed, so that the temperature of the working medium at the inlet of the turbine 8 is effectively controlled, and the purposes of improving the operation efficiency and the peak regulation flexibility of the whole cycle power generation system are achieved.
Compared with the prior art, the invention has the following beneficial effects:
the invention relates to a catalyst prepared from CO2And SF6Supercritical with mixture as working mediumThe Brayton cycle photo-thermal power generation system and the method have the advantages that: (1) by supercritical CO2And SF6The mixture is a working medium, and can well solve the problem of building photo-thermal supercritical CO in areas rich in photo-thermal resources2Supercritical CO in circulating power station2High efficiency of the recycle system and difficulty in cooling the compressor inlet temperature to CO2Due to the increase of the critical point temperature of the mixture working medium, the supercritical CO2And SF6The temperature of the working medium at the inlet of the main compressor in the Brayton cycle photo-thermal power generation system can be cooled to be close to the critical point of the working medium of the mixture, so that the power consumption of the compressor is obviously reduced, and the cycle thermal efficiency of the system is obviously improved; (2) during the actual operation of the circulation system, the inlet particle-sCO is regulated by a shunt control valve2The working medium flow in the heat exchanger can effectively solve the problem of particle-sCO in the system2The heat exchanger can control the temperature of the working medium at the inlet of the turbine, and the operation efficiency and the peak regulation flexibility of the whole photo-thermal power generation system are obviously improved.
Drawings
FIG. 1 is a schematic structural diagram of the present invention.
Wherein, 1 is a mirror field, 2 is a particle heat collector, 3 is a hot tank, 4 is a cold tank, and 5 is particles/s-CO2The heat exchanger, 6 is a flow dividing control valve, 7 is a mixer, 8 is a turbine, 9 is a high-temperature regenerator, 10 is a low-temperature regenerator, 11 is a recompressor, 12 is a precooler, and 13 is a main compressor.
Detailed Description
The invention is described in further detail below with reference to the accompanying drawings:
referring to fig. 1, the mixture working medium supercritical brayton cycle photo-thermal power generation system of the invention comprises a photo-thermal heat source input subsystem and supercritical CO2And SF6The mixture working medium power cycle power generation subsystem;
the photo-thermal heat source input subsystem comprises a mirror field 1, a particle heat collector 2, a hot tank 3, a cold tank 4 and particles/s-CO2The heat exchanger 5 is used for projecting radiant heat from solar irradiation onto the particle heat collector 2 after being focused by the mirror field 1 and cooling particles in the tank 4The particle outlet is communicated with the particle inlet of the particle heat collector 2, the particle outlet of the particle heat collector 2 is communicated with the particle inlet of the hot tank 3, and the particle outlet of the hot tank 3 is communicated with the particles/s-CO2The particle inlets of the heat exchangers 5 are communicated with each other, and the particles/s-CO are2The particle outlet of the heat exchanger 5 is communicated with the particle inlet of the cold tank 4;
the supercritical CO2And SF6The mixture working medium power cycle power generation subsystem adopts supercritical CO2And SF6Working fluid mixture, including particles/s-CO2The system comprises a heat exchanger 5, a flow dividing control valve 6, a mixer 7, a turbine 8, a high-temperature heat regenerator 9, a low-temperature heat regenerator 10, a recompressor 11, a precooler 12 and a main compressor 13; the outlet of the low temperature heat regenerator 10 at the hot side is divided into two paths, wherein one path is communicated with the inlet of a main compressor 13 through a precooler 12, the outlet of the main compressor 13 is communicated with the inlet of the low temperature heat regenerator 10 at the cold side, the other path is communicated with the inlet of a recompressor 11, the outlet of the recompressor 11 and the outlet of the low temperature heat regenerator 10 at the cold side are communicated with the inlet of a high temperature heat regenerator 9 after being combined into a pipe through a pipeline, the outlet of the high temperature heat regenerator 9 at the cold side is communicated with the inlet of a shunt control valve 6, one outlet of the shunt control valve 6 is communicated with particles/2The working medium inlet of the heat exchanger 5 is communicated with the inlet of the particles/s-CO2Supercritical CO of Heat exchanger 52And SF6The mixture working medium absorbs the heat released by the high-temperature solid particles and passes through the particles/s-CO2The mixed working medium from the other outlet of the flow dividing control valve 6 and the working medium outlet of the heat exchanger 5 are mixed by the mixer 7 and then enter the turbine 8 to do work and generate power, the working medium outlet of the turbine 8 is communicated with the hot side inlet of the high-temperature heat regenerator 9, and the hot side outlet of the high-temperature heat regenerator 9 is communicated with the hot side inlet of the low-temperature heat regenerator 10.
As a preferred embodiment of the present invention, supercritical CO2And SF6SF in mixture working fluid6In the range of 0.25 to 0.55, there exists an optimum value, and the determination of the specific optimum value is determined by optimization calculation according to the design boundary conditions of the system.
The invention is in particle/s-CO2A working medium inlet pipeline of the heat exchanger 5 is provided with a flow dividing control valve 6 which is adjustedSplit control valve 6 changes inlet particles/s-CO2The mixture working medium flow in the heat exchanger 5 realizes the effective control of the temperature of the working medium at the inlet of the turbine 8.
As shown in figure 1, in the photo-thermal power generation method of the mixture working medium supercritical Brayton cycle photo-thermal power generation system, low-temperature solid particles from a cold tank 4 are absorbed by a particle heat collector 2 to form high-temperature solid particles, the high-temperature solid particles enter a hot tank 3 and are stored for later use, and when supercritical CO is used2And SF6When the mixture working medium power cycle power generation subsystem needs to generate power, the high-temperature solid particles stored in the hot tank 3 enter the particles/s-CO through the particle outlet of the hot tank 32Particle inlet of heat exchanger 5 at particle/s-CO2In the heat exchanger 5, high-temperature solid particles and supercritical CO2And SF6The mixture working medium exchanges heat to input heat into the supercritical CO2And SF6In the mixture working medium power cycle power generation subsystem, the low-temperature solid particles completing heat exchange pass through particles/s-CO2The particle outlet of the heat exchanger 5 enters the particle inlet of the cold tank 4 and enters the cold tank 4 for storage so as to carry out the next heat absorption cycle process; supercritical CO from high temperature regenerator 92And SF6The mixture working medium is divided into two paths by a shunt control valve 6, and one path enters into particles/s-CO2The heat exchanger 5 absorbs heat of high-temperature solid particles and then enters the mixer 7, the other path of heat directly enters the mixer 7 to be mixed and converged and then enters the turbine 8 to do work externally to generate power, and the work done by the supercritical CO is completed2And SF6The mixture working medium sequentially enters the high-temperature heat regenerator 9 and the low-temperature heat regenerator 10 to release heat and then is divided into two paths, wherein one path enters the main compressor 13 to be compressed after being cooled by the precooler 12, then enters the low-temperature heat regenerator 10 to absorb heat and then flows out from the cold side outlet of the low-temperature heat regenerator 10, and the other path directly enters the hypercritical CO which flows out from the cold side outlet of the low-temperature heat regenerator 10 after being compressed by the recompressor 112And SF6The mixture working medium is mixed and converged and then enters the high-temperature heat regenerator 9 to absorb heat.
The photo-thermal power generation method adopts supercritical CO2And SF6Working mixture, working mixtureThe critical temperature is increased, and the supercritical CO is effectively solved2High efficiency of the recycle system and difficulty in cooling the compressor inlet temperature to CO2The problem of contradiction between critical temperatures of; in particles/s-CO2A working medium inlet pipeline of the heat exchanger 5 is provided with a flow distribution control valve 6, and particles/s-CO can enter by adjusting the flow distribution control valve 62The flow of the mixture working medium in the heat exchanger 5 is changed, so that the temperature of the working medium at the inlet of the turbine 8 is effectively controlled, and the purposes of improving the operation efficiency and the peak regulation flexibility of the whole cycle power generation system are achieved.
The above-mentioned embodiments, objects, technical solutions and advantages of the present invention are further described in detail, it should be understood that the above-mentioned embodiments are only illustrative of the present invention and are not intended to limit the present invention, and any modifications, equivalents, improvements and the like made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (5)
1. The mixture working medium supercritical Brayton cycle photo-thermal power generation system is characterized by comprising a photo-thermal heat source input subsystem and supercritical CO2And SF6The mixture working medium power cycle power generation subsystem;
the photo-thermal heat source input subsystem comprises a mirror field (1), a particle heat collector (2), a hot tank (3), a cold tank (4) and particles/s-CO2The heat exchanger (5) is used for focusing radiant heat from solar irradiation through the mirror field (1) and then projecting the focused radiant heat onto the particle heat collector (2), a particle outlet of the cold tank (4) is communicated with a particle inlet of the particle heat collector (2), a particle outlet of the particle heat collector (2) is communicated with a particle inlet of the hot tank (3), and a particle outlet of the hot tank (3) is communicated with particles/s-CO2The particle inlets of the heat exchanger (5) are communicated with each other, and the particles/s-CO2The particle outlet of the heat exchanger (5) is communicated with the particle inlet of the cooling tank (4);
the supercritical CO2And SF6The mixture working medium power cycle power generation subsystem adopts supercritical CO2And SF6Working fluid mixture, including particles/s-CO2Heat exchanger (5), shunt control valve (6)The system comprises a mixer (7), a turbine (8), a high-temperature regenerator (9), a low-temperature regenerator (10), a recompressor (11), a precooler (12) and a main compressor (13);
the outlet of the hot side of the low-temperature heat regenerator (10) is divided into two paths, wherein one path is communicated with the inlet of a main compressor (13) through a precooler (12), the outlet of the main compressor (13) is communicated with the inlet of the cold side of the low-temperature heat regenerator (10), the other path is communicated with the inlet of a recompressor (11), the outlet of the recompressor (11) and the outlet of the cold side of the low-temperature heat regenerator (10) are communicated with the inlet of the cold side of the high-temperature heat regenerator (9) after being connected in parallel through a pipeline, the outlet of the cold side of the high-temperature heat regenerator (9) is communicated with the inlet of a shunt control valve (6), and one outlet of the shunt control valve (2The working medium inlets of the heat exchanger (5) are communicated with each other and enter particles/s-CO2Supercritical CO of the Heat exchanger (5)2And SF6The mixture working medium absorbs the heat released by the high-temperature solid particles and passes through the particles/s-CO2The working medium outlet of the heat exchanger (5) and the mixed working medium from the other outlet of the flow dividing control valve (6) are mixed by the mixer (7) and then enter the turbine (8) to do work and generate power, the working medium outlet of the turbine (8) is communicated with the hot side inlet of the high-temperature heat regenerator (9), and the hot side outlet of the high-temperature heat regenerator (9) is communicated with the hot side inlet of the low-temperature heat regenerator (10).
2. The system of claim 1, wherein the mixture working medium supercritical brayton cycle photo-thermal power generation system is characterized in that supercritical CO2And SF6SF in mixture working fluid6In the range of 0.25 to 0.55, there exists an optimum value, and the determination of the specific optimum value is determined by optimization calculation according to the design boundary conditions of the system.
3. The system of claim 1, wherein the particle/s-CO is in a mixture working medium supercritical Brayton cycle photo-thermal power generation system2A working medium inlet pipeline of the heat exchanger (5) is provided with a flow distribution control valve (6), and the entering particles/s-CO are changed by adjusting the flow distribution control valve (6)2The mixture working medium flow in the heat exchanger (5) realizes the effective control of the temperature of the working medium at the inlet of the turbine (8).
4. The photothermal power generation method of a mixed working medium supercritical brayton cycle photothermal power generation system as claimed in any one of claims 1 to 3, wherein the low-temperature solid particles from the cold tank (4) become high-temperature solid particles after absorbing the focused solar radiation heat in the particle heat collector (2), and the high-temperature solid particles are stored for later use after entering the hot tank (3) when supercritical CO is used2And SF6When the mixture working medium power cycle power generation subsystem needs to generate power, the high-temperature solid particles stored in the hot tank (3) enter the particles/s-CO through the particle outlet of the hot tank (3)2Particle inlet of heat exchanger (5) at particle/s-CO2In the heat exchanger (5), high-temperature solid particles and supercritical CO2And SF6The mixture working medium exchanges heat to input heat into the supercritical CO2And SF6In the mixture working medium power cycle power generation subsystem, the low-temperature solid particles completing heat exchange pass through particles/s-CO2The particle outlet of the heat exchanger (5) enters the particle inlet of the cold tank (4) and enters the cold tank (4) for storage so as to carry out the next heat absorption cycle process; supercritical CO from high temperature regenerator (9)2And SF6The mixture working medium is divided into two paths by a shunt control valve (6), and one path enters particles/s-CO2The heat exchanger (5) absorbs the heat of the high-temperature solid particles and then enters the mixer (7), the other path of the heat exchanger directly enters the mixer (7) to be mixed and converged and then enters the turbine (8) to do work externally to generate power, and the work done by the supercritical CO is completed2And SF6The mixture working medium sequentially enters a high-temperature heat regenerator (9) and a low-temperature heat regenerator (10) to release heat and then is divided into two paths, wherein one path is cooled by a precooler (12) and then enters a main compressor (13) to be compressed, then enters the low-temperature heat regenerator (10) to absorb heat and then flows out from a cold side outlet of the low-temperature heat regenerator (10), and the other path directly enters a recompressor (11) to be compressed and then flows out from a supercritical CO outlet of the low-temperature heat regenerator (10)2And SF6The mixture working medium is mixed and converged and then enters a high-temperature heat regenerator (9) to absorb heat.
5. The method of claim 4, wherein supercritical CO is used2And SF6The critical temperature of the mixture working medium is increased, and the supercritical CO is effectively solved2High efficiency of the recycle system and difficulty in cooling the compressor inlet temperature to CO2The problem of contradiction between critical temperatures of; in particles/s-CO2A working medium inlet pipeline of the heat exchanger (5) is provided with a flow distribution control valve (6), and the flow distribution control valve (6) is adjusted to enable particles/s-CO to enter2The flow of the mixture working medium in the heat exchanger (5) is changed, so that the temperature of the working medium at the inlet of the turbine (8) is effectively controlled, and the purposes of improving the operation efficiency and the peak regulation flexibility of the whole cycle power generation system are achieved.
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