CN111810260B - Supercritical carbon dioxide split-flow recompression cycle power generation system - Google Patents
Supercritical carbon dioxide split-flow recompression cycle power generation system Download PDFInfo
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- CN111810260B CN111810260B CN202010623030.3A CN202010623030A CN111810260B CN 111810260 B CN111810260 B CN 111810260B CN 202010623030 A CN202010623030 A CN 202010623030A CN 111810260 B CN111810260 B CN 111810260B
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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
- F01K7/00—Steam engine plants characterised by the use of specific types of engine; Plants or engines characterised by their use of special steam systems, cycles or processes; Control means specially adapted for such systems, cycles or processes; Use of withdrawn or exhaust steam for feed-water heating
- F01K7/32—Steam engine plants characterised by the use of specific types of engine; Plants or engines characterised by their use of special steam systems, cycles or processes; Control means specially adapted for such systems, cycles or processes; Use of withdrawn or exhaust steam for feed-water heating the engines using steam of critical or overcritical pressure
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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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- 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
- F01K23/00—Plants characterised by more than one engine delivering power external to the plant, the engines being driven by different fluids
- F01K23/02—Plants characterised by more than one engine delivering power external to the plant, the engines being driven by different fluids the engine cycles being thermally coupled
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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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- Engine Equipment That Uses Special Cycles (AREA)
Abstract
The invention discloses a supercritical carbon dioxide shunt recompression cycle power generation system, which belongs to the technical field of power cycle, wherein a compression precooling loop component comprises a main compression precooling pipeline component, a front compression precooling pipeline component and a bypass pipeline component, the front compression precooling pipeline component comprises a front compression precooling pipeline, a front compressor and a front precooler, an inlet of the main compression precooling pipeline component is connected with an outlet of the front compression precooling pipeline, an outlet of the main compression precooling pipeline component is connected with an inlet of a cycle power generation loop component, an inlet of the front compression precooling pipeline is connected with an outlet of the cycle power generation loop component, the front precooler is arranged at the upstream of the front compressor, an inlet of the bypass pipeline component is connected between the inlet of the front compressor and the outlet of the front precooler, an outlet of the bypass pipeline component is connected with the inlet of the main compression precooler, the carbon dioxide working medium can selectively pass through the bypass pipeline assembly or the front compressor, and the purpose of real-time stable operation of the main compressor is achieved.
Description
Technical Field
The invention relates to the technical field of power cycle, in particular to a supercritical carbon dioxide split-flow recompression cycle power generation system.
Background
Carbon dioxide is considered to be one of the most promising working mediums for energy transmission and energy conversion because of its relatively moderate critical pressure (7.38MPa), good stability and physical properties, inert gas property in a certain temperature range, non-toxicity, abundant reserves, natural existence and the like. Because the supercritical carbon dioxide has larger density and no phase change within a certain operating parameter range, the power system equipment such as a compressor, a turbine and the like which takes the supercritical carbon dioxide as a working medium has smaller volume.
The traditional supercritical carbon dioxide split-flow recompression cycle power generation system is high in power generation efficiency, compact in system and simple in structure. When providing power to a user, a power generation system needs to satisfy both the requirement of the power supply amount and the power supply quality. As the external electrical load changes, the circulation system must be adjusted accordingly to produce an appropriate amount of power. The quality of the power supply is mainly represented by two indexes of frequency and voltage, both of which are related to the rotating speed of the turbine, and the rotating speed of the turbine must be always kept in a specified range. The power supply amount is adjusted in real time through power control of the circulating system. In order to ensure high cycle efficiency, the method of adjusting the pressure in the circulation circuit, i.e. pressure control, is generally considered to be the optimal control method, keeping the pressure ratio substantially constant. When the power is reduced, a part of working medium is discharged from the circulation loop, the pressure of the high-pressure side and the pressure of the low-pressure side of the circulation loop are reduced, otherwise, the working medium is charged, and the pressure of the high-pressure side and the pressure of the low-pressure side of the circulation loop are increased. When the inlet pressure is reduced, if the pressure ratio is kept unchanged, and the inlet temperature and the rotating speed are kept unchanged, the efficiency of the turbine and the compressor which work far away from the critical point is almost kept unchanged, but for the compressor which works near the critical point, the compressor may not reach a stable operation condition or the efficiency is greatly reduced due to the fact that the physical properties of the working medium are changed rapidly along with parameters, and therefore stable and efficient operation of the circulation loop is influenced.
Therefore, a supercritical carbon dioxide split-flow recompression cycle power generation system capable of guaranteeing the stable operation of the main compressor in real time is needed to solve the above technical problems in the prior art.
Disclosure of Invention
The invention aims to provide a supercritical carbon dioxide split-flow recompression cycle power generation system, which can ensure that a main compressor stably operates in real time and the system has higher cycle efficiency in the variable power operation process.
In order to achieve the purpose, the invention adopts the following technical scheme:
a supercritical carbon dioxide split-flow recompression cycle power generation system comprising:
a generator;
a cyclic power generation loop assembly including a turbine connected to the generator;
a compression precooling loop assembly, which comprises a main compression precooling pipeline assembly, a pre-compression precooling pipeline assembly and a bypass pipeline assembly, the pre-compression pre-cooling pipeline assembly comprises a pre-compression pre-cooling pipeline, a pre-compressor and a pre-precooler, the inlet of the main compression precooling pipeline assembly is connected with the outlet of the front compression precooling pipeline, the outlet of the main compression precooling pipeline assembly is connected with the inlet of the circulating power generation loop assembly, the inlet of the pre-compression pre-cooling pipeline is connected with the outlet of the circulating power generation loop assembly, the pre-precooler is arranged at the upstream of the pre-compressor, the inlet of the bypass pipeline assembly is connected between the inlet of the pre-compressor and the outlet of the pre-cooler, the outlet of the bypass pipeline assembly is connected to the inlet of the main compression precooling pipeline assembly, and carbon dioxide working media can selectively pass through the bypass pipeline assembly or the pre-compressor.
As a preferred technical scheme of the supercritical carbon dioxide split-flow recompression cycle power generation system, the main compression precooling pipeline assembly comprises a main compression precooling pipeline, a main compressor and a main precooler, the main precooler is positioned at the upstream of the main compressor, the inlet of the main compression precooling pipeline is connected with the outlet of the pre-compression precooling pipeline, and the outlet of the main compression precooling pipeline is connected with the inlet of the cycle power generation loop assembly.
As a preferable technical scheme of the supercritical carbon dioxide split-flow recompression cycle power generation system, the bypass pipeline assembly comprises a bypass pipeline and a bypass valve arranged on the bypass pipeline, an inlet of the bypass pipeline is connected between an inlet of the pre-compressor and an outlet of the pre-cooler, and an outlet of the bypass pipeline is connected to an inlet of the main compression pre-cooling pipeline assembly.
As a preferred technical solution of the supercritical carbon dioxide split-flow recompression cycle power generation system, the cycle power generation loop assembly includes:
the inlet of the gas storage pipeline assembly is connected with the outlet of the main compression pre-cooling pipeline assembly, the outlet of the gas storage pipeline assembly is connected with the inlet of the front compression pre-cooling pipeline, and the gas storage pipeline assembly is used for storing carbon dioxide working media discharged from the main compression pre-cooling pipeline assembly or filling carbon dioxide working media into the front compression pre-cooling pipeline;
a first inlet of the high-low temperature regenerative loop assembly is connected with an outlet of the main compression precooling pipeline assembly, and a second outlet of the high-low temperature regenerative loop assembly is connected with an inlet of the front compression precooling pipeline;
the inlet of the heating power generation pipeline assembly is connected with the first outlet of the high-low temperature regenerative loop assembly, the outlet of the heating power generation pipeline assembly is connected with the second inlet of the high-low temperature regenerative loop assembly, and the turbine is arranged in the heating power generation pipeline assembly.
As a preferred technical scheme of the supercritical carbon dioxide diversion recompression cycle power generation system, the gas storage pipeline component comprises a gas storage pipeline and a gas storage device arranged on the gas storage pipeline, the inlet of the gas storage pipeline is connected with the outlet of the main compression precooling pipeline component, and the outlet of the gas storage pipeline is connected with the inlet of the front compression precooling pipeline.
As a preferred technical solution of the supercritical carbon dioxide split-flow recompression cycle power generation system, the high and low temperature regenerative loop assembly includes:
the low-temperature side inlet of the low-temperature regenerator is the first inlet, and the high-temperature side outlet of the low-temperature regenerator is the second outlet;
the low-temperature side inlet of the high-temperature regenerator is connected with the low-temperature side outlet of the low-temperature regenerator, the low-temperature side outlet of the high-temperature regenerator is the first outlet, the high-temperature side inlet of the high-temperature regenerator is the second inlet, and the high-temperature side outlet of the high-temperature regenerator is connected with the high-temperature side inlet of the low-temperature regenerator.
As a preferred technical scheme of the supercritical carbon dioxide split-flow recompression cycle power generation system, the high-low temperature regenerative loop assembly further comprises a recompression pipeline assembly, an inlet of the recompression pipeline assembly is connected with the second outlet, and an outlet of the recompression pipeline assembly is connected to a low-temperature side inlet of the high-temperature regenerator.
As a preferable technical scheme of the supercritical carbon dioxide split-flow recompression cycle power generation system, the recompression pipeline assembly comprises a recompression pipeline and a recompressor arranged on the recompression pipeline, an inlet of the recompression pipeline is connected with the second outlet, and an outlet of the recompression pipeline is connected to a low-temperature side inlet of the high-temperature regenerator.
As a preferred technical scheme of the supercritical carbon dioxide split-flow recompression cycle power generation system, the heating power generation pipeline assembly comprises a heating power generation pipeline, the turbine is arranged on the heating power generation pipeline, an inlet of the heating power generation pipeline is connected with the first outlet, and an outlet of the heating power generation pipeline is connected with the second inlet.
As a preferable technical scheme of the supercritical carbon dioxide split-flow recompression cycle power generation system, the heating power generation pipeline assembly further comprises a heater, the heater is arranged on the heating power generation pipeline, and the heater is arranged at the upstream of the turbine.
The invention provides a supercritical carbon dioxide split-flow recompression cycle power generation system, which is characterized in that a pre-compression pre-cooling pipeline assembly is arranged at the upstream of a main compression pre-cooling pipeline assembly, the pre-compression pre-cooling pipeline assembly comprises a pre-compressor and a pre-precooler, an inlet of a bypass pipeline assembly is connected between an inlet of the pre-compressor and an outlet of the pre-precooler, an outlet of the bypass pipeline assembly is connected with an inlet of the main compression pre-cooling pipeline assembly, when the supercritical carbon dioxide split-flow recompression cycle power generation system is in a partial load operation condition, the bypass pipeline assembly is not conducted, the carbon dioxide working medium discharged from the pre-cooler enters the main compression pre-cooling pipeline assembly through the pre-compressor, therefore, the deficiency of the pressure of the inlet of the main compression precooling pipeline assembly is compensated, the temperature of the inlet of the main compression precooling pipeline assembly is ensured, and the main compressor in the main compression precooling pipeline assembly can stably run; when the supercritical carbon dioxide shunt recompression cycle power generation system is in the working condition of full load operation, the pressure of the carbon dioxide working medium discharged from the cycle power generation loop assembly can meet the pressure requirement of stable operation of the main compressor in the main compression precooling pipeline assembly, therefore, the front-mounted compressor is withdrawn from working, the bypass pipeline assembly is conducted, the carbon dioxide working medium discharged from the front-mounted precooler enters the main compression precooling pipeline assembly from the bypass pipeline assembly, the supercritical carbon dioxide shunt recompression cycle power generation system can ensure stable operation of the compressor no matter in the working condition of full load operation or in the working condition of partial load operation, and further ensures that the system has higher cycle efficiency.
Drawings
Fig. 1 is a schematic diagram of a supercritical carbon dioxide split-flow recompression cycle power generation system according to an embodiment of the present invention.
Reference numerals:
1. a generator;
2. a cyclic power generation loop assembly; 21. an air storage line assembly; 211. an air storage line; 212. a gas storage device; 22. a high and low temperature regenerative circuit assembly; 221. a low temperature regenerator; 222. a high temperature regenerator; 223. then compressing the pipeline assembly; 2231. then compressing the pipeline; 2232. then compressing the mixture; 23. heating the power generation pipeline assembly; 231. heating the power generation pipeline; 232. a turbine; 233. a heater;
3. compressing the pre-cooling circuit assembly; 31. a main compression pre-cooling pipeline assembly; 311. a main compression pre-cooling pipeline; 312. a main compressor; 313. a primary precooler; 32. pre-compressing the pre-cooling pipeline assembly; 321. pre-compressing the pre-cooling pipeline; 322. a pre-compressor; 323. a pre-cooler; 33. a bypass line assembly; 331. a bypass line; 332. a bypass valve.
Detailed Description
In order to make the technical problems solved, the technical solutions adopted and the technical effects achieved by the present invention clearer, the technical solutions of the present invention are further described below by way of specific embodiments with reference to the accompanying drawings.
In the description of the present invention, unless expressly stated or limited otherwise, the terms "connected," "connected," and "fixed" are to be construed broadly, e.g., as meaning permanently connected, removably connected, or integral to one another; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
In the present invention, unless otherwise expressly stated or limited, "above" or "below" a first feature means that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact with each other via another feature therebetween. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.
In the description of the present embodiment, the terms "upper", "lower", "left", "right", and the like are used based on the orientations and positional relationships shown in the drawings only for convenience of description and simplification of operation, and do not indicate or imply that the referred device or element must have a specific orientation, be configured and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used only for descriptive purposes and are not intended to have a special meaning.
As shown in fig. 1, the present embodiment provides a supercritical carbon dioxide split-flow recompression cycle power generation system, which includes a power generator 1, a cycle power generation loop assembly 2 and a compression pre-cooling loop assembly 3, wherein the cycle power generation loop assembly 2 includes a turbine 232, the turbine 232 is connected to the power generator 1, and the turbine 232 provides power for driving the engine 1 to generate power; the compression pre-cooling loop assembly 3 comprises a main compression pre-cooling pipeline assembly 31, a pre-compression pre-cooling pipeline assembly 32 and a bypass pipeline assembly 33, wherein the pre-compression pre-cooling pipeline assembly 32 comprises a pre-compression pre-cooling pipeline 321, a pre-compressor 322 and a pre-precooler 323, wherein an inlet of the main compression pre-cooling pipeline assembly 31 is connected with an outlet of the pre-compression pre-cooling pipeline 321, an outlet of the main compression pre-cooling pipeline assembly 31 is connected with an inlet of the cycle power generation loop assembly 2, an inlet of the pre-compression pre-cooling pipeline 321 is connected with an outlet of the cycle power generation loop assembly 2, the pre-precooler 323 is arranged at the upstream of the pre-compressor 322, the pre-precooler 323 is used for cooling a carbon dioxide working medium at an inlet of the pre-compressor 322 to a preset temperature, the pre-compressor 322 is used for pressurizing the carbon dioxide working medium from the pre-precooler 323 so as to meet the pressure at the inlet of the compressor in the main compression pre-cooling pipeline assembly 31, the inlet of bypass pipeline assembly 33 is connected between the inlet of pre-compressor 322 and the outlet of pre-cooler 323, the outlet of bypass pipeline assembly 33 is connected to the inlet of main compression pre-cooling pipeline assembly 31, and carbon dioxide working medium can selectively pass through bypass pipeline assembly 33 or pre-compressor 322.
The supercritical carbon dioxide split-flow recompression cycle power generation system is provided with a pre-compression pre-cooling pipeline assembly 32 at the upstream of a main compression pre-cooling pipeline assembly 31, the pre-compression pre-cooling pipeline assembly 32 comprises a pre-compressor 322 and a pre-precooler 323, the inlet of a bypass pipeline assembly 33 is connected between the inlet of the pre-compressor 322 and the outlet of the pre-precooler 323, the outlet of the bypass pipeline assembly 33 is connected with the inlet of the main compression pre-cooling pipeline assembly 31, when the supercritical carbon dioxide split-flow recompression cycle power generation system is in a partial load operation condition, the bypass pipeline assembly 33 is not conducted, the carbon dioxide working medium discharged from the pre-cooler 323 enters the main compression pre-cooling pipeline assembly 31 through the pre-compressor 322, thereby compensating for the lack of pressure at the inlet of the main compression pre-cooling pipeline assembly 31 and ensuring the temperature at the inlet of the main compression pre-cooling pipeline assembly 31, so that the main compressor 312 in the main compression pre-cooling pipeline assembly 31 can stably operate; when the supercritical carbon dioxide split-flow recompression cycle power generation system is in the working condition of full load operation, the pressure of the carbon dioxide working medium discharged from the cycle power generation loop assembly 2 can meet the pressure requirement of stable operation of the compressor in the main compression precooling pipeline assembly 31, therefore, the front compressor 322 is withdrawn from working, the bypass pipeline assembly 33 is conducted, the carbon dioxide working medium discharged from the front precooler 323 enters the main compression precooling pipeline assembly 31 from the bypass pipeline assembly 33, the supercritical carbon dioxide split-flow recompression cycle power generation system can ensure the stable operation of the main compressor 312 no matter under the working condition of full load operation or under the working condition of partial load operation, further the cycle efficiency of the system is prevented from being greatly reduced, and the system is ensured to have higher cycle efficiency. The pre-compressor 322 and pre-precooler 323 of this embodiment are configured to maintain the pressure and temperature of the carbon dioxide working fluid at predetermined pressure and temperature levels, thereby ensuring high efficiency operation of the turbine 232. Alternatively, the pre-compressor 322 may be driven by an adjustable speed variable frequency motor or an adjustable speed small turbine.
The turbine 232 is a machine that converts energy contained in the fluid medium into mechanical work, and is also called a turbine, and in this embodiment, the turbine 232 is a supercritical carbon dioxide turbine that drives a rotor to rotate by using high-temperature and high-pressure carbon dioxide to output power.
Preferably, the main compression pre-cooling pipeline assembly 31 includes a main compression pre-cooling pipeline 311, a main compressor 312 and a main pre-cooler 313, wherein the main pre-cooler 313 is located upstream of the main compressor 312, an inlet of the main compression pre-cooling pipeline 311 is connected to an outlet of the pre-compression pre-cooling pipeline 321, an outlet of the main compression pre-cooling pipeline 311 is connected to an inlet of the cycle power generation circuit assembly 2, the main compressor 312 is configured to pressurize the carbon dioxide working medium, and the main pre-cooler 313 is configured to cool the carbon dioxide working medium entering the main compressor 312 to reach a specified temperature.
Specifically, bypass line assembly 33 includes a bypass line 331 and a bypass valve 332 disposed on bypass line 331, an inlet of bypass line 331 is connected between an inlet of pre-compressor 322 and an outlet of pre-cooler 323, an outlet of bypass line 331 is connected to an inlet of main-compression pre-cooling line assembly 31, and bypass valve 332 is opened when pre-compressor 322 is out of operation to provide a carbon dioxide working fluid flow path.
As shown in fig. 1, the circulation power generation circuit assembly 2 includes: the system comprises an air storage pipeline assembly 21, a high-low temperature regenerative loop assembly 22 and a heating power generation pipeline assembly 23, wherein an inlet of the air storage pipeline assembly 21 is connected with an outlet of a main compression precooling pipeline assembly 31, an outlet of the air storage pipeline assembly 21 is connected with an inlet of a front compression precooling pipeline 321, and the air storage pipeline assembly 21 is used for storing a part of carbon dioxide working medium discharged from the main compression precooling pipeline assembly 31 or charging the carbon dioxide working medium into the front compression precooling pipeline 321; a first inlet of the high-low temperature regenerative loop assembly 22 is connected with an outlet of the main compression precooling pipeline assembly 31, and a second outlet of the high-low temperature regenerative loop assembly 22 is connected with an inlet of the front compression precooling pipeline 321; the inlet of the heating and power generation pipeline assembly 23 is connected with the first outlet of the high-low temperature regenerative loop assembly 22, the outlet of the heating and power generation pipeline assembly 23 is connected with the second inlet of the high-low temperature regenerative loop assembly 22, and the turbine 232 is arranged in the heating and power generation pipeline assembly 23.
Preferably, the gas storage pipeline assembly 21 includes a gas storage pipeline 211 and a gas storage device 212 disposed on the gas storage pipeline 211, an inlet of the gas storage pipeline 211 is connected to an outlet of the main compression pre-cooling pipeline assembly 31, and an outlet of the gas storage pipeline 211 is connected to an inlet of the front compression pre-cooling pipeline 321. When the circulating power of the supercritical carbon dioxide shunt recompression circulating power generation system is under a partial load working condition, the following two regulation conditions exist: when the circulating power is reduced, the carbon dioxide working medium discharged from the outlet of the main compressor 312 is stored in the gas storage device 212, and the mass of the carbon dioxide working medium in the circulating loop of the circulating power generation system is reduced after the supercritical carbon dioxide is shunted and compressed; the pressure ratio is kept basically unchanged by reducing the pressure of the supercritical carbon dioxide shunt and recompression on the high pressure side and the low pressure side of a circulating loop of the circulating power generation system; the mass flow of the circulation loop decreases; the pre-compressor 322 operates to compensate for the lack of pressure at the inlet of the main compressor 312. When the circulating power of the supercritical carbon dioxide shunt recompression circulating power generation system is increased, carbon dioxide working medium is input from the gas storage device 212 to the inlet of the pre-cooler 323, and the mass of the carbon dioxide working medium in the circulating loop of the supercritical carbon dioxide shunt recompression circulating power generation system is increased; the pressure of the high-pressure side and the low-pressure side in a circulating loop of the supercritical carbon dioxide shunt recompression circulating power generation system is increased, and the pressure ratio is kept basically unchanged; the mass flow of the circulating loop of the supercritical carbon dioxide shunt recompression circulating power generation system is increased; the pre-compressor 322 operates to compensate for the lack of pressure at the inlet of the main compressor 312, and the power variation range of this power regulation method is 50% to 100%. It should be noted that when the supercritical carbon dioxide split-flow recompression cycle power generation system reaches the full load condition, the pre-compressor 322 does not work, and the carbon dioxide working medium flows through the bypass pipeline 331.
Specifically, high and low temperature regenerative circuit assembly 22 includes: the system comprises a low-temperature regenerator 221 and a high-temperature regenerator 222, wherein a low-temperature side inlet of the low-temperature regenerator 221 is a first inlet, a high-temperature side outlet of the low-temperature regenerator 221 is a second outlet, and the low-temperature regenerator 221 performs primary heating on a carbon dioxide working medium pressurized by a main compressor 312 by using waste heat of the carbon dioxide working medium discharged from a high-temperature side outlet of the high-temperature regenerator 222; the low-temperature side inlet of the high-temperature regenerator 222 is connected to the low-temperature side outlet of the low-temperature regenerator 221, the low-temperature side outlet of the high-temperature regenerator 222 is a first outlet, the high-temperature side inlet of the high-temperature regenerator 222 is a second inlet, the high-temperature side outlet of the high-temperature regenerator 222 is connected to the high-temperature side inlet of the low-temperature regenerator 221, and the high-temperature regenerator 222 secondarily heats the carbon dioxide working medium heated by the low-temperature regenerator 221 by using the residual heat of the carbon dioxide working medium discharged from the outlet of the heating power generation pipeline assembly 23.
As shown in fig. 1, high-low temperature regenerative circuit assembly 22 further includes a recompression pipe assembly 223, an inlet of recompression pipe assembly 223 is connected to a second outlet of high-low temperature regenerative circuit assembly 22, and an outlet of recompression pipe assembly 223 is connected to a low-temperature side inlet of high-temperature regenerator 222.
Specifically, recompression pipe assembly 223 includes recompression pipe 2231 and recompression machine 2232 arranged on recompression pipe 2231, and the inlet and the second outlet of recompression pipe 2231 are connected, and the outlet of recompression pipe 2231 is connected to the low temperature side inlet of high temperature regenerator 222, and recompression machine 2232 pressurizes the carbon dioxide working medium that comes out from the high temperature side outlet of low temperature regenerator 221.
As shown in fig. 1, the heating and power generating pipeline assembly 23 includes a heating and power generating pipeline 231, a turbine 232 is disposed on the heating and power generating pipeline 231, an inlet of the heating and power generating pipeline 231 is connected to a first outlet of the high and low temperature regenerative circuit assembly 22, and an outlet of the heating and power generating pipeline 231 is connected to a second inlet of the high and low temperature regenerative circuit assembly 22.
Further, the heating and power generating pipeline assembly 23 further includes a heater 233, the heater 233 is disposed on the heating and power generating pipeline 231, the heater 233 is disposed at the upstream of the turbine 232, and the heater 233 heats the carbon dioxide working medium heated by the high temperature regenerator 222 three times to reach a specified temperature entering the turbine 232.
The working method of the supercritical carbon dioxide split-flow recompression cycle power generation system provided by the embodiment is as follows:
under the design condition, the supercritical carbon dioxide shunt is recompressed to circulate the full load operation of the power generation system, the bypass valve 332 is in the open state, and the pre-compressor 322 does not work. The main compressor 312 pressurizes the carbon dioxide working fluid to a high pressure, such as: 30MPa, the carbon dioxide working medium is heated by the low-temperature regenerator 221 and the high-temperature regenerator 222, and then enters the heater 233 to be heated to a high temperature, for example: and at the temperature of 600 ℃, the gas enters a turbine 232 to do work through expansion to push a generator 1 to generate power, and the turbine 232 discharges low-pressure carbon dioxide working media, such as: and 8MPa, the waste heat is released through the high-temperature heat regenerator 222 and the low-temperature heat regenerator 221, the carbon dioxide working medium at the outlet of the low-temperature heat regenerator 221 is divided into two paths, one path enters a recompressor 2232 for pressurization, the other path enters a pre-precooler 323 for cooling, and then the carbon dioxide working medium is cooled to a low temperature through a bypass valve 332 and a main precooler 313, such as: 32 c and finally into the main compressor 312.
When the design working condition is converted to the non-design working condition, the supercritical carbon dioxide shunt-flow recompression cycle power generation system is converted to partial load operation, for example: 65% of the design working condition power. The bypass valve 332 is in the closed state and the pre-compressor 322 is operating. And a part of carbon dioxide working medium in the circulating loop of the supercritical carbon dioxide shunting recompression cycle power generation system is discharged from the outlet of the main compressor 312 to the gas storage device 212, and the mass flow of the circulating loop of the supercritical carbon dioxide shunting recompression cycle power generation system is about 65% of the designed working condition. The main compressor 312 pressurizes the carbon dioxide working fluid to a high pressure, such as: 20MPa, the carbon dioxide working medium is heated by the low-temperature regenerator 221 and the high-temperature regenerator 222, and then enters the heater 233 to be heated to the same temperature as the designed working condition, for example: the temperature is 600 ℃, and then the gas enters a turbine 232 to do work through expansion to push a generator 1 to generate power, and the turbine 232 discharges low-pressure carbon dioxide working media, such as: and 5.3MPa, the waste heat is released by the high-temperature heat regenerator 222 and the low-temperature heat regenerator 221, the carbon dioxide working medium at the outlet of the low-temperature heat regenerator 221 is divided into two paths, one path enters a recompressor 2232 for pressurization, and the other path enters a pre-precooler 323 for cooling to a low temperature, for example: 32 ℃, compressed by the pre-compressor 322 to the pressure required by the inlet of the main compressor 312, and finally cooled by the main precooler 313 to the same temperature as the design condition, for example: 32 c and finally into the main compressor 312.
If the power needs to be increased under the non-design working condition, the gas storage device 212 charges carbon dioxide working medium into the circulating loop of the supercritical carbon dioxide split-flow recompression cycle power generation system from the inlet of the pre-cooler 323. The pressure of the circulating loop of the supercritical carbon dioxide shunt recompression circulating power generation system is increased, and the circulating loop of the supercritical carbon dioxide shunt recompression circulating power generation system is balanced under the new pressure and outputs the required power outwards.
When the working condition returns to the design working condition from the non-design working condition, the gas storage device 212 charges carbon dioxide working medium into the circulating loop of the supercritical carbon dioxide split-flow recompression cycle power generation system from the inlet of the pre-cooler 323. The bypass valve 332 is opened and the pre-compressor 322 is deactivated. And the supercritical carbon dioxide shunt is recompressed to recycle the recycle loop of the cyclic power generation system to the design working condition again, and the system is operated at full load.
The above description is only a preferred embodiment of the present invention, and for those skilled in the art, the present invention should not be limited by the description of the present invention, which should be interpreted as a limitation.
Claims (10)
1. A supercritical carbon dioxide split-flow recompression cycle power generation system, comprising:
a generator (1);
a cyclic power generation loop assembly (2) comprising a turbine (232), the turbine (232) being connected to the generator (1);
a compression precooling loop assembly (3) which comprises a main compression precooling pipeline assembly (31), a pre-compression precooling pipeline assembly (32) and a bypass pipeline assembly (33), wherein the pre-compression precooling pipeline assembly (32) comprises a pre-compression precooling pipeline (321), a pre-compressor (322) and a pre-precooler (323), an inlet of the main compression precooling pipeline assembly (31) is connected with an outlet of the pre-compression precooling pipeline (321), an outlet of the main compression precooling pipeline assembly (31) is connected with an inlet of the cyclic power generation loop assembly (2), an inlet of the pre-compression precooling pipeline (321) is connected with an outlet of the cyclic power generation loop assembly (2), the pre-precooler (323) is arranged at the upstream of the pre-compressor (322), an inlet of the bypass pipeline assembly (33) is connected between an inlet of the pre-compressor (322) and an outlet of the pre-precooler (323), the outlet of the bypass pipeline assembly (33) is connected to the inlet of the main compression pre-cooling pipeline assembly (31), and carbon dioxide working medium can selectively pass through the bypass pipeline assembly (33) or the pre-compressor (322).
2. The supercritical carbon dioxide split-flow recompression cycle power generation system as claimed in claim 1, wherein the main compression pre-cooling pipeline assembly (31) comprises a main compression pre-cooling pipeline (311), a main compressor (312) and a main pre-cooler (313), the main pre-cooler (313) is located upstream of the main compressor (312), an inlet of the main compression pre-cooling pipeline (311) is connected with an outlet of the pre-compression pre-cooling pipeline (321), and an outlet of the main compression pre-cooling pipeline (311) is connected with an inlet of the cycle power generation loop assembly (2).
3. The supercritical carbon dioxide split-flow recompression cycle power generation system as claimed in claim 1, wherein the bypass line assembly (33) comprises a bypass line (331) and a bypass valve (332) disposed on the bypass line (331), an inlet of the bypass line (331) is connected between an inlet of the pre-compressor (322) and an outlet of the pre-cooler (323), and an outlet of the bypass line (331) is connected to an inlet of the main compression pre-cooling line assembly (31).
4. The supercritical carbon dioxide split-flow recompression cycle power generation system as claimed in any of claims 1-3, wherein the cycle power generation loop assembly (2) comprises:
an inlet of the gas storage pipeline assembly (21) is connected with an outlet of the main compression precooling pipeline assembly (31), an outlet of the gas storage pipeline assembly (21) is connected with an inlet of the front compression precooling pipeline (321), and the gas storage pipeline assembly (21) is used for storing carbon dioxide working media discharged from the main compression precooling pipeline assembly (31) or filling carbon dioxide working media into the front compression precooling pipeline (321);
a first inlet of the high-low temperature regenerative loop assembly (22) is connected with an outlet of the main compression precooling pipeline assembly (31), and a second outlet of the high-low temperature regenerative loop assembly (22) is connected with an inlet of the front compression precooling pipeline (321);
the inlet of the heating power generation pipeline assembly (23) is connected with the first outlet of the high-low temperature regenerative loop assembly (22), the outlet of the heating power generation pipeline assembly (23) is connected with the second inlet of the high-low temperature regenerative loop assembly (22), and the turbine (232) is arranged in the heating power generation pipeline assembly (23).
5. The supercritical carbon dioxide split-flow recompression cycle power generation system as claimed in claim 4, wherein the gas storage pipeline assembly (21) comprises a gas storage pipeline (211) and a gas storage device (212) disposed on the gas storage pipeline (211), an inlet of the gas storage pipeline (211) is connected to an outlet of the main compression precooling pipeline assembly (31), and an outlet of the gas storage pipeline (211) is connected to an inlet of the front compression precooling pipeline (321).
6. The supercritical carbon dioxide split-flow recompression cycle power generation system as claimed in claim 4, wherein said high and low temperature regenerative circuit assembly (22) comprises:
a low-temperature regenerator (221), wherein a low-temperature side inlet of the low-temperature regenerator (221) is the first inlet, and a high-temperature side outlet of the low-temperature regenerator (221) is the second outlet;
and a low-temperature side inlet of the high-temperature regenerator (222) is connected with a low-temperature side outlet of the low-temperature regenerator (221), a low-temperature side outlet of the high-temperature regenerator (222) is the first outlet, a high-temperature side inlet of the high-temperature regenerator (222) is the second inlet, and a high-temperature side outlet of the high-temperature regenerator (222) is connected with a high-temperature side inlet of the low-temperature regenerator (221).
7. The supercritical carbon dioxide split-flow recompression cycle power generation system as claimed in claim 6, wherein said high and low temperature regenerative circuit assembly (22) further comprises a recompression piping assembly (223), wherein an inlet of said recompression piping assembly (223) is connected to said second outlet, and wherein an outlet of said recompression piping assembly (223) is connected to a low temperature side inlet of said high temperature regenerator (222).
8. The supercritical carbon dioxide split-flow recompression cycle power generation system as claimed in claim 7, wherein said recompression line assembly (223) comprises a recompression line (2231) and a recompressor (2232) disposed on said recompression line (2231), wherein an inlet of said recompression line (2231) is connected to said second outlet, and an outlet of said recompression line (2231) is connected to a low temperature side inlet of said high temperature regenerator (222).
9. The supercritical carbon dioxide split-flow recompression cycle power generation system as claimed in claim 4, wherein said heating and power generation piping assembly (23) comprises a heating and power generation piping (231), said turbine (232) is disposed on said heating and power generation piping (231), an inlet of said heating and power generation piping (231) is connected to said first outlet, and an outlet of said heating and power generation piping (231) is connected to said second inlet.
10. The supercritical carbon dioxide split-flow recompression cycle power generation system as claimed in claim 9, wherein said heating and power generation piping assembly (23) further comprises a heater (233), said heater (233) being disposed on said heating and power generation piping (231), said heater (233) being disposed upstream of said turbine (232).
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| CN112554980B (en) * | 2020-11-25 | 2022-03-22 | 西安交通大学 | Double-backpressure supercritical carbon dioxide poly-generation system and operation method |
| CN112554982B (en) * | 2020-11-25 | 2022-04-05 | 西安交通大学 | Supercritical carbon dioxide cogeneration system and operation method |
| CN112855298B (en) * | 2021-02-01 | 2021-11-23 | 北京前沿动力科技股份有限公司 | Supercritical carbon dioxide circulating power generation system and operation method thereof |
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