CN114687824B - Supercritical carbon dioxide circulating system and method suitable for regulating and controlling temperature of villiaumite high-temperature reactor - Google Patents
Supercritical carbon dioxide circulating system and method suitable for regulating and controlling temperature of villiaumite high-temperature reactor Download PDFInfo
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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
- F01K25/10—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 the vapours being cold, e.g. ammonia, carbon dioxide, ether
- F01K25/103—Carbon dioxide
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
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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
- F01K11/00—Plants characterised by the engines being structurally combined with boilers or condensers
- F01K11/02—Plants characterised by the engines being structurally combined with boilers or condensers the engines being turbines
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Abstract
The invention discloses a supercritical carbon dioxide circulating system and a supercritical carbon dioxide circulating method adaptive to temperature regulation of a villiaumite high-temperature reactor, wherein the system comprises a villiaumite cooling high-temperature reactor with a pool structure and a supercritical carbon dioxide energy conversion system with high-temperature reheating and high-low temperature heat exchangers connected in series, and a multi-stage heater and a reheater are arranged in the villiaumite reactor by utilizing the space characteristics of the pool structure, so that the temperature interval of a high-temperature heat source is highly matched, the full utilization of molten salt heat is realized, and the circulating efficiency is improved; the intelligent control of the temperature of the villiaumite can be realized by changing the flow of the carbon dioxide side, and the difficulty in regulating and controlling the reactor side is greatly reduced. The system and the method of the invention are helpful for promoting the development of the miniaturized novel energy conversion system in China.
Description
Technical Field
The invention belongs to the field of novel energy conversion system design, and particularly relates to a supercritical carbon dioxide circulating system and method suitable for regulating and controlling the temperature of a villiaumite high-temperature reactor.
Background
The villiaumite cooling high-temperature reactor has the characteristics of high-temperature low-pressure operation, no water cooling, inherent safety, compact structure and the like, is suitable for building a small-volume, light-weight and low-cost modular heat source, is used for high-efficiency power generation and other high-temperature processes, and meets the requirements of multipurpose and multi-level energy supply in western arid remote areas in China. The supercritical carbon dioxide cycle becomes a novel energy conversion system with great potential due to the advantages of high efficiency, good compactness, wide applicability, environmental friendliness and the like, can be coupled with various heat sources such as photo-thermal, nuclear reactors, fossil fuels and the like, and can realize high-efficiency energy conversion in complex environments and scenes.
The characteristics of the villiaumite cooling high-temperature reactor and the supercritical carbon dioxide energy conversion system are matched, but the research aiming at the villiaumite cooling high-temperature reactor and the supercritical carbon dioxide energy conversion system is relatively independent at present, and the research on the aspects of coupling the villiaumite cooling high-temperature reactor with the supercritical carbon dioxide energy conversion system and regulating the temperature of the reactor side by adjusting the carbon dioxide side is still blank.
Disclosure of Invention
In order to overcome the shortcomings of the existing researches, the invention aims to provide a supercritical carbon dioxide circulating system and a supercritical carbon dioxide circulating method adaptive to temperature regulation of a fluorine salt high-temperature reactor, wherein the system takes the fluorine salt cooling high-temperature reactor with a pool-type structure as a heat source of the circulating system, and utilizes the space characteristics of the pool-type structure to arrange a multi-stage heater and a reheater in the fluorine salt reactor, so that the temperature interval of the high-temperature heat source is highly matched, the full utilization of molten salt heat is realized, and the circulating efficiency is improved; in addition, the flow of the carbon dioxide side streams entering different heat exchangers is changed by adjusting the opening degree of the flow dividing valve, so that the temperature of the villiaumite is intelligently controlled, and the difficulty in controlling the reflux temperature is greatly reduced.
In order to achieve the purpose, the invention adopts the following technical scheme:
the supercritical carbon dioxide circulation system is suitable for regulating and controlling the temperature of a villiaumite high-temperature reactor and comprises a villiaumite cooling high-temperature reactor with a pool structure and a supercritical carbon dioxide energy conversion system with high-temperature reheating and high-low temperature heat exchangers connected in series, a plurality of heat exchangers, namely a high-temperature heater 1-2, a reheater 1-3 and a low-temperature heater 1-4, are arranged in the villiaumite cooling high-temperature reactor by utilizing the space characteristics of the pool structure so as to realize the full utilization of the heat of fused salt, and meanwhile, the proper control of the reflux temperature of the fused salt is realized by adjusting the opening of a flow dividing valve 16, so that the safety and the stability of a villiaumite cooling high-temperature reactor body are ensured;
the pool-type structure fluorine salt cooling high-temperature reactor comprises a fluorine salt cooling high-temperature reactor core 1-1, a high-temperature heater 1-2, a reheater 1-3 and a low-temperature heater 1-4;
the supercritical carbon dioxide energy conversion system with the high-temperature reheating and high-low temperature heat exchangers connected in series comprises a precooler 8, a first-stage main compressor 10, an interstage cooler 9, a second-stage main compressor 12, a low-temperature heat regenerator 7, a medium-temperature heat regenerator 6, a high-temperature heat regenerator 5, a high-temperature high-pressure turbine 15 and a high-temperature low-pressure turbine 14 which are connected in sequence; also includes a low temperature turbine 13 and a recompressor 11;
the moderate regulation and control operation mode of the reflux temperature of the molten salt is as follows: the flow ratio of carbon dioxide entering the cold side of the high-temperature heat regenerator 5 and the flow ratio of carbon dioxide entering the cold side of the low-temperature heater 1 to 4 can be changed by adjusting the opening of the diverter valve 16, and the carbon dioxide entering the high-temperature heat regenerator 5 sequentially passes through the high-temperature heater 1 to 2, the high-temperature high-pressure turbine 15 and the reheater 1 to 3, so that the flow ratio of the carbon dioxide entering the low-temperature heater 1 to 4, the high-temperature heater 1 to 2 and the reheater 1 to 3 can be changed by adjusting the opening of the diverter valve 16, and the regulation and control of the outlet temperature of the fluorine salt are realized; when the flow rate entering the low temperature heater 1-4 is larger, the temperature of the fluorine salt outlet will be increased, and when the flow rate entering the high temperature heater 1-2 and the reheater 1-3 is larger, the temperature of the fluorine salt outlet will be decreased.
The inlet of the working medium at the 1-1 side of the reactor core of the fluorine salt cooling high-temperature reactor is communicated with the working medium outlets at the hot side of a plurality of heat exchangers, the outlet of the working medium at the 1-1 side of the reactor core of the fluorine salt cooling high-temperature reactor is communicated with the working medium inlets at the hot side of the plurality of heat exchangers, the outlet of the working medium at the 1-2 cold side of the high-temperature heater is communicated with the inlet of the high-temperature high-pressure turbine 15, the outlet of the working medium at the 1-2 hot side of the high-temperature heater is communicated with the inlet of the working medium at the hot side of the reheater 1-3, and the outlet of the working medium at the hot side of the reheater 1-3 is communicated with the inlet of the working medium at the hot side of the low-temperature heater 1-4; a working medium outlet at the cold side of the low-temperature heater 1-4 is connected with an inlet of a low-temperature turbine 13, a working medium outlet at the cold side of the reheater 1-3 is connected with an inlet of a high-temperature low-pressure turbine 14, and a working medium inlet at the cold side of the reheater 1-3 is communicated with an outlet of a high-temperature high-pressure turbine 15;
a cold side working medium outlet of the high-temperature heat regenerator 5 is connected with a cold side working medium inlet of the high-temperature heater 1-2, and a hot side working medium inlet of the high-temperature heat regenerator 5 is connected with an outlet of the high-temperature low-pressure turbine 14;
the cold side working medium inlet of the intermediate temperature heat regenerator 6 is simultaneously communicated with the outlet of the recompressor 11 and the cold side working medium outlet of the low temperature heat regenerator 7; a cold side working medium outlet of the medium temperature heat regenerator 6 is simultaneously communicated with a cold side working medium inlet of the high temperature heat regenerator 5 and cold side working medium inlets of the low temperature heaters 1-4, a hot side working medium inlet of the medium temperature heat regenerator 6 is simultaneously communicated with a hot side working medium outlet of the high temperature heat regenerator 5 and an outlet of the low temperature turbine 13, and a hot side working medium outlet of the medium temperature heat regenerator 6 is communicated with a hot side working medium inlet of the low temperature heat regenerator 7;
a working medium outlet at the hot side of the low-temperature heat regenerator 7 is simultaneously connected with a working medium inlet at the hot side of the precooler 8 and an inlet of the recompressor 11, and a working medium inlet at the cold side of the low-temperature heat regenerator 7 is communicated with an outlet of the second-stage main compressor 12;
and a working medium outlet at the hot side of the precooler 8 is communicated with an inlet of the first-stage main compressor 10, a working medium inlet at the hot side of the interstage cooler 9 is communicated with an outlet of the first-stage main compressor 10, and a working medium outlet at the hot side of the interstage cooler 9 is communicated with an inlet of the second-stage main compressor 12.
The outlet temperature of the reactor core 1-1 of the high-temperature reactor cooled by the villiaumite is 700 ℃, and the inlet temperature of the reactor core 1-1 of the high-temperature reactor cooled by the villiaumite is 600 ℃.
The temperature of a working medium outlet at the hot side of the precooler 8 is 32-35 ℃, and an air cooling mode is adopted to adapt to arid areas.
The working media used by the system are supercritical carbon dioxide and villiaumite.
According to the operation method of the supercritical carbon dioxide circulating system suitable for the temperature regulation of the villiaumite high-temperature reactor, supercritical carbon dioxide is boosted in a first-stage main compressor 10, cooled in an interstage cooler 9, boosted again in a second-stage main compressor 12, absorbed in a low-temperature heat regenerator 7 and a medium-temperature heat regenerator 6 in sequence, and then shunted, one strand of the supercritical carbon dioxide enters a high-temperature heat regenerator 5 and a high-temperature heater 1-2 to absorb heat and become high-temperature high-pressure carbon dioxide, then the high-temperature high-pressure carbon dioxide enters a high-temperature high-pressure turbine 15 to expand and do work, the exhaust gas of the high-temperature high-pressure turbine 15 is reheated by the reheater 1-3 and enters a high-temperature low-pressure turbine 14 to expand and do work, and the exhaust gas of the high-temperature low-pressure turbine 14 releases heat in the high-temperature heat regenerator 5; the other strand absorbs heat in the low-temperature heaters 1-4, enters the low-temperature turbine 13 to do work through expansion, exhaust gas of the low-temperature turbine 13 is converged with the working medium in the high-temperature heat regenerator 5 at an inlet at the hot side of the medium-temperature heat regenerator 6, releases heat in the medium-temperature heat regenerator 6 and the low-temperature heat regenerator 7 in sequence and then is divided, one strand is boosted by the recompressor 11 and then is converged into a working medium inlet at the cold side of the medium-temperature heat regenerator 6, and the other strand enters the first-stage main compressor 10 after being cooled in the precooler 8, so that closed cycle is completed.
Compared with the prior art, the invention has the following advantages:
1) The system adopts the fluorine salt cooling high-temperature reactor with the pool type structure as a heat source, and utilizes the space characteristics of the pool type structure to arrange the multi-stage heater and the reheater in the fluorine salt reactor, so that the temperature interval of the high-temperature heat source is highly matched, the heat of molten salt is fully utilized, and the circulation efficiency is improved.
2) The hot end of the supercritical carbon dioxide circulating system is configured to be high-temperature reheated and connected with the high-low temperature heat exchanger in series, the cold end of the supercritical carbon dioxide circulating system is configured to be recompressed and inter-stage cooled, and the heat of villiaumite under different temperature gradients is fully utilized through reheating and reasonable shunting, so that the circulating efficiency is improved.
3) The operation method for regulating and controlling the temperature of the fluorine salt is that the proportion of the fluorine salt entering the high-temperature heater 1-2, the reheater 1-3 and the low-temperature heater 1-4 is changed by changing the opening degree of the diverter valve 16, so that the temperature of a fluorine salt outlet is regulated and controlled; when the flow rate entering the low-temperature heater 1-4 is larger, the temperature of the fluorine salt outlet is increased, and when the flow rate entering the high-temperature heater 1-2 and the reheater 1-3 is larger, the temperature of the fluorine salt outlet is reduced.
4) The invention adopts a small-sized villiaumite cooling high-temperature reactor as a heat source of the Brayton cycle of the supercritical carbon dioxide, and the advantages of compact structure, safety and reliability of the small-sized villiaumite cooling high-temperature reactor and the Brayton cycle of the supercritical carbon dioxide are ingeniously combined to realize the miniaturization and modularization of a novel energy conversion system.
5) According to the invention, a recompression interstage cooling supercritical carbon dioxide power cycle configuration with high-temperature reheating and high-temperature heat exchanger connected in series is adopted, the system cycle efficiency is higher, and meanwhile, the villiaumite temperature can be controlled by changing the flow of the carbon dioxide side, so that the difficulty in regulating and controlling the reactor side is greatly reduced.
6) The invention adopts an air-cooled precooler to realize large-scale application in arid water-deficient areas.
Drawings
FIG. 1 is a schematic diagram of a supercritical carbon dioxide energy conversion system coupled to a small-scale villiaumite-cooled high temperature reactor of the present invention.
In the figure: 1-1 is a small-sized villiaumite cooling high-temperature stack, 1-2 is a high-temperature heater, 1-3 is a low-temperature heater, 1-4 is a reheater, 5 is a high-temperature regenerator, 6 is a medium-temperature regenerator, 7 is a low-temperature regenerator, 8 is a precooler, 9 is an interstage cooler, 10 is a first-stage main compressor, 11 is a recompressor, 12 is a second-stage main compressor, 13 is a low-temperature turbine, 14 is a high-temperature low-pressure turbine, and 15 is a high-temperature high-pressure turbine.
Detailed Description
The invention is described in further detail below with reference to the drawings and the detailed description.
As shown in fig. 1, the supercritical carbon dioxide circulation system adapted to the temperature regulation of the villiaumite high-temperature reactor of the invention comprises a villiaumite cooling high-temperature reactor with a pool structure and a supercritical carbon dioxide energy conversion system with high-temperature reheating and high-low temperature heat exchangers connected in series, and a plurality of heat exchangers, namely a high-temperature heater 1-2, a reheater 1-3 and a low-temperature heater 1-4, are arranged in the villiaumite cooling high-temperature reactor by utilizing the space characteristics of the pool structure to realize the full utilization of molten salt heat, so that the structure is more compact while the circulation efficiency is improved; in addition, the proper control of the molten salt backflow temperature is realized by adjusting the opening degree of the flow dividing valve 16, and the safety and stability of the high-temperature reactor body cooled by the villiaumite are ensured.
The pool-type structure fluorine salt cooling high-temperature reactor comprises a fluorine salt cooling high-temperature reactor core 1-1, a high-temperature heater 1-2, a reheater 1-3 and a low-temperature heater 1-4; the supercritical carbon dioxide energy conversion system with the high-temperature reheating and high-low temperature heat exchangers connected in series comprises a precooler 8, a first-stage main compressor 10, an interstage cooler 9, a second-stage main compressor 12, a low-temperature heat regenerator 7, a medium-temperature heat regenerator 6, a high-temperature heat regenerator 5, a high-temperature high-pressure turbine 15 and a high-temperature low-pressure turbine 14 which are connected in sequence; also included are a cryogenic turbine 13 and a recompressor 11.
The moderate regulation and control operation mode of the reflux temperature of the molten salt is as follows: the flow ratio of carbon dioxide entering the cold side of the high-temperature heat regenerator 5 and the flow ratio of carbon dioxide entering the cold side of the low-temperature heater 1 to 4 can be changed by adjusting the opening of the diverter valve 16, and the carbon dioxide entering the high-temperature heat regenerator 5 sequentially passes through the high-temperature heater 1 to 2, the high-temperature high-pressure turbine 15 and the reheater 1 to 3, so that the flow ratio of the carbon dioxide entering the low-temperature heater 1 to 4, the high-temperature heater 1 to 2 and the reheater 1 to 3 can be changed by adjusting the opening of the diverter valve 16, the outlet temperature of the fluorine salt is regulated, and the complex control of the stack side is avoided; when the flow rate entering the low temperature heater 1-4 is larger, the temperature of the fluorine salt outlet will be increased, and when the flow rate entering the high temperature heater 1-2 and the reheater 1-3 is larger, the temperature of the fluorine salt outlet will be decreased.
The connection relationship among all the parts of the system is as follows: the inlet of a working medium at the hot side of a fluorine salt cooling high-temperature reactor core 1-1 is communicated with the outlets of the working medium at the hot side of a plurality of heat exchangers, the outlet of the working medium at the hot side of the fluorine salt cooling high-temperature reactor core 1-1 is communicated with the inlets of the working medium at the hot side of the plurality of heat exchangers, the outlet of the working medium at the cold side of a high-temperature heater 1-2 is communicated with the inlet of a high-temperature high-pressure turbine 15, the outlet of the working medium at the hot side of the high-temperature heater 1-2 is communicated with the inlet of the working medium at the hot side of a reheater 1-3, and the outlet of the working medium at the hot side of the reheater 1-3 is communicated with the inlet of the working medium at the hot side of a low-temperature heater 1-4; a working medium outlet at the cold side of the low-temperature heater 1-4 is connected with an inlet of a low-temperature turbine 13, a working medium outlet at the cold side of the reheater 1-3 is connected with an inlet of a high-temperature low-pressure turbine 14, and a working medium inlet at the cold side of the reheater 1-3 is communicated with an outlet of a high-temperature high-pressure turbine 15; a cold side working medium outlet of the high-temperature heat regenerator 5 is connected with a cold side working medium inlet of the high-temperature heater 1-2, and a hot side working medium inlet of the high-temperature heat regenerator 5 is connected with an outlet of the high-temperature low-pressure turbine 14; the cold side working medium inlet of the intermediate temperature heat regenerator 6 is simultaneously communicated with the outlet of the recompressor 11 and the cold side working medium outlet of the low temperature heat regenerator 7; a cold side working medium outlet of the medium temperature heat regenerator 6 is simultaneously communicated with a cold side working medium inlet of the high temperature heat regenerator 5 and cold side working medium inlets of the low temperature heaters 1-4, a hot side working medium inlet of the medium temperature heat regenerator 6 is simultaneously communicated with a hot side working medium outlet of the high temperature heat regenerator 5 and an outlet of the low temperature turbine 13, and a hot side working medium outlet of the medium temperature heat regenerator 6 is communicated with a hot side working medium inlet of the low temperature heat regenerator 7; a working medium outlet at the hot side of the low-temperature heat regenerator 7 is simultaneously communicated with a working medium inlet at the hot side of the precooler 8 and an inlet of the recompressor 11, and a working medium inlet at the cold side of the low-temperature heat regenerator 7 is communicated with an outlet of the second-stage main compressor 12; and a working medium outlet at the hot side of the precooler 8 is communicated with an inlet of the first-stage main compressor 10, a working medium inlet at the hot side of the interstage cooler 9 is communicated with an outlet of the first-stage main compressor 10, and a working medium outlet at the hot side of the interstage cooler 9 is communicated with an inlet of the second-stage main compressor 12.
The working media used by the system are supercritical carbon dioxide and villiaumite.
In a preferred embodiment of the present invention, the outlet temperature of the fluoride salt-cooled high temperature reactor core 1-1 is 700 ℃, and the inlet temperature of the fluoride salt-cooled high temperature reactor core 1-1 is 600 ℃.
As the preferred embodiment of the invention, the temperature of the working medium outlet at the hot side of the precooler 8 is 32-35 ℃, and an air cooling mode is adopted to adapt to arid areas.
As shown in fig. 1, according to the operation method of the supercritical carbon dioxide circulation system adapted to the temperature regulation of the villiaumite high-temperature reactor, supercritical carbon dioxide is boosted in a first-stage main compressor 10, cooled in an interstage cooler 9, and power consumption of the compressor is reduced, after the supercritical carbon dioxide is boosted again in a second-stage main compressor 12, the supercritical carbon dioxide is subjected to heat absorption in a low-temperature heat regenerator 7 and a medium-temperature heat regenerator 6 in sequence and then shunted, one strand of the supercritical carbon dioxide enters a high-temperature heat regenerator 5 and a high-temperature heater 1-2 to absorb heat and then becomes high-temperature high-pressure carbon dioxide, then the high-temperature high-pressure carbon dioxide enters a high-temperature high-pressure turbine 15 to expand and do work, exhaust gas of the high-temperature high-pressure turbine 15 is reheated by a reheater 1-3, heat of villiaumite is fully utilized, the exhaust gas enters a high-temperature low-pressure turbine 14 to expand and do work, and exhaust gas of the high-temperature low-pressure turbine 14 releases heat in the high-temperature heat regenerator 5; the other strand absorbs heat in the low-temperature heaters 1-4, enters the low-temperature turbine 13 to do work through expansion, exhaust gas of the low-temperature turbine 13 is converged with the working medium in the high-temperature heat regenerator 5 at an inlet at the hot side of the medium-temperature heat regenerator 6, releases heat in the medium-temperature heat regenerator 6 and the low-temperature heat regenerator 7 in sequence and then is divided, one strand is boosted by the recompressor 11 and then is converged into a working medium inlet at the cold side of the medium-temperature heat regenerator 6, and the other strand enters the first-stage main compressor 10 after being cooled in the precooler 8, so that closed cycle is completed.
Claims (6)
1. The supercritical carbon dioxide circulation system is suitable for regulating and controlling the temperature of a villiaumite high-temperature reactor and is characterized by comprising a villiaumite cooling high-temperature reactor with a pool structure and a supercritical carbon dioxide energy conversion system with high-temperature reheating and high-low temperature heat exchangers connected in series, wherein a plurality of heat exchangers, namely a high-temperature heater (1-2), a reheater (1-3) and a low-temperature heater (1-4), are arranged in the villiaumite cooling high-temperature reactor by utilizing the space characteristics of the pool structure so as to realize the full utilization of heat of fused salt, and meanwhile, the proper control on the reflux temperature of the fused salt is realized by regulating the opening degree of a flow dividing valve (16), so that the safety and the stability of a villiaumite cooling high-temperature reactor body are ensured;
the pool-type structure fluorine salt cooling high-temperature reactor comprises a fluorine salt cooling high-temperature reactor core (1-1), a high-temperature heater (1-2), a reheater (1-3) and a low-temperature heater (1-4);
the supercritical carbon dioxide energy conversion system with the high-temperature reheating and high-low temperature heat exchangers connected in series comprises a precooler (8), a first-stage main compressor (10), an interstage cooler (9), a second-stage main compressor (12), a low-temperature heat regenerator (7), a medium-temperature heat regenerator (6), a high-temperature heat regenerator (5), a high-temperature high-pressure turbine (15) and a high-temperature low-pressure turbine (14) which are connected in sequence; also comprises a low-temperature turbine (13) and a recompressor (11);
the moderate regulation and control operation mode of the reflux temperature of the molten salt is as follows: the flow ratio of carbon dioxide entering the cold side of the high-temperature regenerator (5) and the cold side of the low-temperature heater (1-4) can be changed by adjusting the opening of the diverter valve (16), and the carbon dioxide entering the high-temperature regenerator (5) sequentially passes through the high-temperature heater (1-2), the high-temperature high-pressure turbine (15) and the reheater (1-3), so that the flow ratio of the carbon dioxide entering the low-temperature heater (1-4), the high-temperature heater (1-2) and the reheater (1-3) can be changed by adjusting the opening of the diverter valve (16), and the regulation and control of the outlet temperature of the fluorine salt are realized; when the flow rate entering the low-temperature heater (1-4) is larger, the temperature of the fluorine salt outlet is increased, and when the flow rate entering the high-temperature heater (1-2) and the reheater (1-3) is larger, the temperature of the fluorine salt outlet is reduced.
2. The supercritical carbon dioxide circulation system that accommodates villiaumite thermopile temperature regulation of claim 1, characterized in that: the working medium inlet of the core (1-1) of the fluorine salt cooled high-temperature reactor is communicated with the hot side working medium outlets of the plurality of heat exchangers, the working medium outlet of the core (1-1) of the fluorine salt cooled high-temperature reactor is communicated with the hot side working medium inlets of the plurality of heat exchangers, the cold side working medium outlet of the high-temperature heater (1-2) is communicated with the inlet of the high-temperature high-pressure turbine (15), the hot side working medium outlet of the high-temperature heater (1-2) is communicated with the hot side working medium inlet of the reheater (1-3), and the hot side working medium outlet of the reheater (1-3) is communicated with the hot side working medium inlet of the low-temperature heater (1-4); a cold side working medium outlet of the low-temperature heater (1-4) is connected with an inlet of a low-temperature turbine (13), a cold side working medium outlet of the reheater (1-3) is connected with an inlet of a high-temperature low-pressure turbine (14), and a cold side working medium inlet of the reheater (1-3) is communicated with an outlet of a high-temperature high-pressure turbine (15);
a cold side working medium outlet of the high-temperature heat regenerator (5) is connected with a cold side working medium inlet of the high-temperature heater (1-2), and a hot side working medium inlet of the high-temperature heat regenerator (5) is connected with an outlet of the high-temperature low-pressure turbine (14);
a cold side working medium inlet of the intermediate temperature heat regenerator (6) is simultaneously communicated with an outlet of the recompressor (11) and a cold side working medium outlet of the low temperature heat regenerator (7); a cold side working medium outlet of the medium temperature heat regenerator (6) is simultaneously communicated with a cold side working medium inlet of the high temperature heat regenerator (5) and a cold side working medium inlet of the low temperature heater (1-4), a hot side working medium inlet of the medium temperature heat regenerator (6) is simultaneously communicated with a hot side working medium outlet of the high temperature heat regenerator (5) and a low temperature turbine (13) outlet, and a hot side working medium outlet of the medium temperature heat regenerator (6) is communicated with a hot side working medium inlet of the low temperature heat regenerator (7);
a hot side working medium outlet of the low-temperature heat regenerator (7) is simultaneously connected with a hot side working medium inlet of the precooler (8) and an inlet of the recompressor (11), and a cold side working medium inlet of the low-temperature heat regenerator (7) is communicated with an outlet of the second-stage main compressor (12);
the hot side working medium outlet of the precooler (8) is communicated with the inlet of the first-stage main compressor (10), the hot side working medium inlet of the interstage cooler (9) is communicated with the outlet of the first-stage main compressor (10), and the hot side working medium outlet of the interstage cooler (9) is communicated with the inlet of the second-stage main compressor (12).
3. The supercritical carbon dioxide circulation system that accommodates villiaumite thermopile temperature regulation of claim 1, characterized in that: the outlet temperature of the core (1-1) of the villiaumite-cooled high-temperature reactor is 700 ℃, and the inlet temperature of the core (1-1) of the villiaumite-cooled high-temperature reactor is 600 ℃.
4. The supercritical carbon dioxide circulation system that accommodates villiaumite thermopile temperature regulation of claim 1, characterized in that: the temperature of a working medium outlet at the hot side of the precooler (8) is 32-35 ℃, and an air cooling mode is adopted to adapt to arid areas.
5. The supercritical carbon dioxide circulation system that accommodates villiaumite thermopile temperature regulation of claim 1, characterized in that: the working media used by the system are supercritical carbon dioxide and villiaumite.
6. The method for operating a supercritical carbon dioxide cycle system adapted to the regulation of the temperature of a villiaumite thermopile according to any one of claims 1 to 5, characterized in that: the supercritical carbon dioxide is boosted in a first-stage main compressor (10), cooled in an interstage cooler (9), and then boosted again in a second-stage main compressor (12), and then absorbed in a low-temperature heat regenerator (7) and a medium-temperature heat regenerator (6) in sequence and then split, one strand of the supercritical carbon dioxide enters a high-temperature heat regenerator (5) and a high-temperature heater (1-2) to absorb heat and then becomes high-temperature and high-pressure carbon dioxide, then the high-temperature and high-pressure carbon dioxide enters a high-temperature and high-pressure turbine (15) to expand and work, the exhaust gas of the high-temperature and high-pressure turbine (15) is reheated by a reheater (1-3) and enters a high-temperature and low-pressure turbine (14) to expand and work, and the exhaust gas of the high-temperature and low-pressure turbine (14) releases heat in the high-temperature heat regenerator (5); the other strand absorbs heat in the low-temperature heaters (1-4), enters the low-temperature turbine (13) to do work through expansion, exhaust gas of the low-temperature turbine (13) is converged with working media in the high-temperature heat regenerator (5) at a hot side inlet of the medium-temperature heat regenerator (6), releases heat in the medium-temperature heat regenerator (6) and the low-temperature heat regenerator (7) in sequence and then is split, the other strand is boosted by the recompressor (11) and then is converged into a cold side working media inlet of the medium-temperature heat regenerator (6), and the other strand enters the first-stage main compressor (10) after being cooled in the precooler (8) to complete closed cycle.
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