CN104791204B - A kind of underground heat, combustion gas and supercritical carbon dioxide combined generating system - Google Patents
A kind of underground heat, combustion gas and supercritical carbon dioxide combined generating system Download PDFInfo
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- CN104791204B CN104791204B CN201510132018.1A CN201510132018A CN104791204B CN 104791204 B CN104791204 B CN 104791204B CN 201510132018 A CN201510132018 A CN 201510132018A CN 104791204 B CN104791204 B CN 104791204B
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- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 title claims abstract description 192
- 239000001569 carbon dioxide Substances 0.000 title claims abstract description 96
- 229910002092 carbon dioxide Inorganic materials 0.000 title claims abstract description 95
- 239000000567 combustion gas Substances 0.000 title abstract 2
- 238000010438 heat treatment Methods 0.000 claims abstract description 76
- 239000012530 fluid Substances 0.000 claims abstract description 66
- 239000007789 gas Substances 0.000 claims abstract description 48
- 230000005611 electricity Effects 0.000 claims abstract description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 72
- 239000002737 fuel gas Substances 0.000 claims description 32
- 238000002485 combustion reaction Methods 0.000 claims description 29
- 238000010248 power generation Methods 0.000 claims description 21
- 239000000446 fuel Substances 0.000 claims description 7
- 239000007800 oxidant agent Substances 0.000 claims description 7
- 230000001590 oxidative effect Effects 0.000 claims description 7
- 239000003380 propellant Substances 0.000 claims description 6
- 230000008929 regeneration Effects 0.000 claims 1
- 238000011069 regeneration method Methods 0.000 claims 1
- 238000003303 reheating Methods 0.000 abstract 1
- 238000001816 cooling Methods 0.000 description 4
- 238000006243 chemical reaction Methods 0.000 description 2
- 230000006835 compression Effects 0.000 description 2
- 238000007906 compression Methods 0.000 description 2
- 230000000704 physical effect Effects 0.000 description 2
- 238000005086 pumping Methods 0.000 description 2
- CBENFWSGALASAD-UHFFFAOYSA-N Ozone Chemical compound [O-][O+]=O CBENFWSGALASAD-UHFFFAOYSA-N 0.000 description 1
- 238000003916 acid precipitation Methods 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 239000002803 fossil fuel Substances 0.000 description 1
- 239000011261 inert gas Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000035772 mutation Effects 0.000 description 1
- 231100000956 nontoxicity Toxicity 0.000 description 1
- 238000010792 warming Methods 0.000 description 1
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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
- Y02E10/10—Geothermal energy
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Abstract
The invention discloses a kind of underground heat, combustion gas and supercritical carbon dioxide combined generating system, including geothermal heating system, gas heating system and supercritical carbon dioxide recompression Brayton cycle electricity generation system.The present invention recompresses Brayton cycle for supercritical carbon dioxide by geothermal heating system and gas heating system and provides energy source, supercritical carbon dioxide fluid is exchanged heat with geothermal heating system first, after certain temperature is heated to, enter back into gas heating system and carry out reheating, it is heated to working medium of the supercritical carbon dioxide fluid of turbine-inlet temperature and pressure as supercritical carbon dioxide recompression Brayton cycle, turbine is promoted to be done work, turbine drives generating set to produce electric energy.The present invention provides new thinking for the utilization of geothermal energy resources and the application of supercritical carbon dioxide recompression Bretton power cycle.
Description
The technical field is as follows:
the invention relates to a geothermal, gas and supercritical carbon dioxide combined power generation system, which is used for utilization of geothermal energy and application of supercritical carbon dioxide recompression Brayton power cycle.
Background art:
in recent years, with the development of industry, the problem caused by the large consumption of energy sources is more and more prominent. Accelerated consumption of fossil fuels poses many environmental problems such as global warming, acid rain, ozone depletion, pollution of land and ocean, etc.
Therefore, the development and utilization of new energy and renewable energy are of great strategic importance, whether viewed from the high level of economic society that walks the way of sustainable development and protects the ecological environment of the earth on which humans live, or from the energy supply that addresses reality for about 20 billion people without electricity and special uses in the world. According to data of the united nations world energy evaluation report in 2007, the annual utilization coefficient of wind power generation in 2007 is 21% (21% of the time in one year is in operation), the solar energy utilization coefficient is 14%, and the utilization coefficient of geothermal energy is 72%, which is 3.4 times of wind energy and 5.1 times of solar energy. In renewable energy sources, compared with other renewable energy sources, geothermal energy has the advantages of low investment and operation cost, high utilization coefficient, almost no influence of weather and climate, stable power generation and the like, so that the geothermal energy has competitiveness, and has application potential and significance in enhancing the research and utilization of the geothermal energy.
By utilizing the phenomenon of physical property mutation of the supercritical fluid near the critical temperature, the operating point of the compressor is arranged in a high-density area near the critical temperature, and the operating point of the heat exchanger is arranged in a low-density area behind the critical temperature, so that the compression power consumption can be reduced and the higher efficiency can be realized on the premise of ensuring the gas cooling. The property of the supercritical fluid has obvious advantages when the supercritical fluid is used as an energy conversion working medium. Carbon dioxide (CO)2) Because the critical pressure of the working fluid is relatively moderate (7.38MPa), the working fluid has better stability and physical properties, shows the properties of inert gas in a certain temperature range, and has the characteristics of no toxicity, rich reserves, natural existence and the like, the working fluid is considered to be one of energy transmission and energy conversion working fluids with the most application prospect. Due to supercritical carbon dioxide (S-CO)2) Has high density and no phase change in a certain operating parameter range, and is used as supercritical carbon dioxide (S-CO)2) The power system equipment such as a compressor, a gas turbine and the like for working media has compact structure and smaller volume. For example, the supercritical carbon dioxide Brayton cycle system which generates 20MW of power occupies only four cubic meters of space. Supercritical carbon dioxide (S-CO)2) Brayton (Brayton) cycle turbines are commonly used in large thermal and nuclear power generation applications, including next generation power reactors, with the goal of eventually replacing steam driven rankine cycle turbines (which are less efficient, about 30 times the volume of supercritical carbon dioxide turbines).
The invention content is as follows:
the invention aims to provide a method for improving energy utilization efficiency, providing a stable power supply and simultaneously realizing utilization of geothermal energy and supercritical carbon dioxide recompression (S-CO)2) The application of Brayton power cycle provides a new concept of a geothermal, gas and supercritical carbon dioxide combined power generation system.
In order to achieve the purpose, the invention adopts the following technical scheme to realize the purpose:
a combined power generation system of geothermal heat, fuel gas and supercritical carbon dioxide comprises a geothermal heating system, a fuel gas heating system and a supercritical carbon dioxide recompression Brayton cycle power generation system; wherein,
the geothermal heating system comprises a geothermal exploitation well, an outlet of the geothermal exploitation well is communicated with an inlet of a water pumping pump, an outlet of the water pumping pump is connected with an inlet of a hot water pump, an outlet of the hot water pump is connected with a geothermal water inlet of a geothermal energy heating heat exchanger, and a geothermal water outlet of the geothermal energy heating heat exchanger is connected with an inlet of a recharge well;
the gas heating system comprises an injector, an outlet of the injector is connected with an inlet of a combustion chamber, an outlet of the combustion chamber is connected with a gas inlet of a gas heating heat exchanger, and a gas outlet of the gas heating heat exchanger is connected with an inlet of a gas exhaust receiving device;
the supercritical carbon dioxide recompression Brayton cycle power generation system comprises a turbine, wherein the outlet of the turbine is connected with the high-temperature side supercritical carbon dioxide fluid inlet of a high-temperature heat regenerator, the high-temperature side supercritical carbon dioxide fluid outlet of the high-temperature heat regenerator is connected with the high-temperature side supercritical carbon dioxide fluid inlet of a low-temperature heat regenerator, the high-temperature side supercritical carbon dioxide fluid outlet of the low-temperature heat regenerator is divided into two paths, one path is connected with the inlet of a recompression unit, the outlet of the recompression unit is connected with the low-temperature side supercritical carbon dioxide fluid inlet of the high-temperature heat regenerator, the other path is connected with the inlet of a condenser, the outlet of the condenser is connected with the inlet of a main compressor unit, the outlet of the main compressor unit is connected with the low-temperature side supercritical carbon dioxide fluid inlet of the low-temperature heat regenerator, and the low-temperature side supercritical carbon dioxide fluid outlet of the, and the supercritical carbon dioxide fluid outlet at the low-temperature side of the high-temperature heat regenerator is connected with the supercritical carbon dioxide fluid inlet of the geothermal energy heating heat exchanger, the inlet of the turbine is communicated with the supercritical carbon dioxide fluid outlet of the gas heating heat exchanger, and the turbine is used for driving the generator set to generate power.
The invention further improves the following steps: the injector is provided with three inlets, fuel, oxidant and water are respectively introduced, the fuel, oxidant and water propellant enter the combustion chamber through the injector to directly participate in combustion, and the gas generating device adopts a direct combustion type three-component combustion mode to form mixed gas with adjustable temperature and other parameters.
The invention further improves the following steps: the supercritical carbon dioxide recompression Brayton cycle power generation system uses supercritical carbon dioxide as a working medium.
The invention further improves the following steps: a first control valve is arranged on a connecting pipeline between the outlet of the hot water pump and a geothermal water inlet of the geothermal energy heating heat exchanger and is used for controlling the flow of geothermal water entering the geothermal energy heating heat exchanger; a second control valve and a third control valve are arranged on a connecting pipeline between a geothermal water outlet of the geothermal energy heating heat exchanger and an inlet of the recharging well and are respectively used for controlling the flow of geothermal water flowing out of the geothermal energy heating heat exchanger and the flow of geothermal water returning to the recharging well; and a fourth control valve is arranged between the outlet of the water pump and the inlet connecting pipeline of the hot water pump and between the second control valve and the third control valve, and is used for preventing geothermal energy water from smoothly returning to the recharge well when the geothermal energy heating heat exchanger fails.
The invention further improves the following steps: when the system works normally, the first control valve, the second control valve and the third control valve are opened, the fourth control valve is closed, at the moment, hot water in the geothermal exploitation well enters a pipeline communicated with the geothermal energy heating heat exchanger under the action of a water pump, the hot water enters the geothermal energy heating heat exchanger to exchange heat with supercritical carbon dioxide fluid flowing out of a high-temperature heat regenerator through the action of the hot water pump, geothermal water after heat exchange returns to the recharge well through a return channel to form a loop, the second control valve and the third control valve on the return channel control the flow rate of the return flow of the geothermal water, and when the system fails, the first control valve and the second control valve are closed, the third control valve and the fourth control valve are opened, and the geothermal water directly returns to the recharge well without passing through the geothermal energy heating heat exchanger;
the fuel, oxidant and water propellant enter the fuel gas generator through the injector, and after premixing, the mixed fuel gas enters the combustion chamber to directly participate in combustion to form high-temperature mixed fuel gas, the mixed fuel gas enters the fuel gas heating heat exchanger through the outlet of the combustion chamber to exchange heat with the supercritical carbon dioxide fluid flowing out of the geothermal energy heating heat exchanger, the supercritical carbon dioxide fluid is heated for the second time, and the mixed fuel gas after heat exchange enters the fuel gas exhaust receiving device to be processed;
the carbon dioxide fluid at the outlet of the turbine enters the high-temperature heat regenerator to release heat, and then enters the low-temperature heat regenerator to exchange heat again, then, one part of the carbon dioxide fluid directly enters the recompression unit to be compressed, the other part of the carbon dioxide fluid enters the condenser to be cooled, and then enters the main compressor unit to be compressed, and then, the temperature of the carbon dioxide fluid directly compressed by the recompression unit is heated again through the low-temperature heat regenerator, the two flows of the mixed fluids flow through the high-temperature heat regenerator, the geothermal heating heat exchanger and the gas heating heat exchanger together, and finally, the mixed fluids flow into the turbine to do work, and the turbine drives the generator set to generate power to form closed circulation.
Compared with the prior art, the invention adopts the geothermal heating system and the fuel gas heating system as the supercritical carbon dioxide (S-CO)2) Then compressed Brayton (Brayton) is used for circularly providing heat, the supercritical carbon dioxide fluid exchanges heat with a geothermal heating system firstly, and then enters a gas heating system for exchanging heat after being heated to a certain temperature, and is heated to a turbineSupercritical carbon dioxide fluid of inlet temperature and pressure as supercritical carbon dioxide (S-CO)2) And then, the Brayton (Brayton) circulating working medium is compressed to push a turbine to do work, and the turbine drives a generator set to generate electric energy. In the whole combined power generation system, the heat energy generated by burning the geothermal energy and the fuel gas is used as supercritical carbon dioxide (S-CO)2) Then the heat source of a Brayton (Brayton) cycle power generation system is compressed to realize the supercritical carbon dioxide (S-CO)2) And then the Brayton (Brayton) power cycle is compressed, and a carbon dioxide turbine drags the generator set to generate electric energy, so that the energy utilization efficiency is improved, and a stable power supply is provided. The system is used for utilizing geothermal energy and recompressing (S-CO) supercritical carbon dioxide2) The application of Brayton power cycle provides a new idea.
Description of the drawings:
FIG. 1 is a schematic structural view of the present invention;
in the figure: 1. the system comprises a geothermal exploitation well, 2, a recharge well, 3, a water pump, 4, a hot water pump, 5, a geothermal energy heating heat exchanger, 6, an injector, 7, a combustion chamber, 8, a gas heating heat exchanger, 9, a gas exhaust receiving device, 10, a high-temperature regenerator, 11, a low-temperature regenerator, 12, a condenser, 13, a main compressor unit, 14, a recompression unit, 15, a turbine, 16, a generator set, F1, a first control valve, F2, a second control valve, F3, a third control valve, F4 and a fourth control valve.
The specific implementation mode is as follows:
the present invention will be described in detail with reference to the accompanying drawings.
Referring to fig. 1, the invention relates to a geothermal, gas and supercritical carbon dioxide combined power generation system, which comprises a geothermal heating system, a gas heating system and supercritical carbon dioxide (S-CO)2) And recompressing a Brayton (Brayton) cycle power generation system.
The geothermal heating system comprises a geothermal exploitation well 1, a recharge well 2, a water pump 3, a hot water pump 4, a geothermal energy heating heat exchanger 5, a first control valve F1, a second control valve F2, a third control valve F3 and a fourth control valve F4, wherein an outlet of the geothermal exploitation well 1 is communicated with an inlet of the water pump 3, an outlet of the water pump 3 is connected with an inlet of the hot water pump 4, an outlet of the hot water pump 4 is connected with a geothermal water inlet of the geothermal energy heating heat exchanger 5, a geothermal water outlet of the geothermal energy heating heat exchanger 5 is connected with an inlet of the recharge well 2, a first control valve F1 is installed on a geothermal water inlet connecting pipeline of the outlet of the hot water pump 4 and the geothermal water heating heat exchanger 5, and a geothermal water outlet of the geothermal energy heating heat exchanger 5 and an inlet connecting pipeline of the recharge well 2 are provided with a second control valve F2 and a third control valve F3; a fourth control valve F4 is arranged between the connecting pipeline of the outlet of the water suction pump 3 and the inlet of the hot water pump 4 and the connecting pipeline of the second control valve F2 and the third control valve F3; when the system works normally, the first control valve F1, the second control valve F2 and the third control valve F3 are opened, the fourth control valve F4 is closed, at the moment, hot water in the geothermal exploitation well enters a pipeline communicated with the geothermal energy heating heat exchanger 5 under the action of the water suction pump 3, the hot water enters the geothermal energy heating heat exchanger 5 through the work of the hot water pump 4 to exchange heat with supercritical carbon dioxide fluid flowing out of the high-temperature heat regenerator 10, geothermal water after heat exchange returns to the recharging well 2 through a return channel to form a loop, the second control valve F2 and the third control valve F3 on the return channel control the flow rate of the backflow of the geothermal water, when the system fails, the first control valve F1 and the second control valve F2 are closed, the third control valve F3 and the fourth control valve F4 are opened, at the moment, the geothermal energy heats the heat exchanger 5, and the geothermal energy directly returns to the recharging well 2.
The gas heating system comprises an injector 6, a combustion chamber 7 and a gas heating heat exchanger 8, wherein an outlet of the injector 6 is connected with an inlet of the combustion chamber 7, an outlet of the combustion chamber 7 is connected with a gas inlet of the gas heating heat exchanger 8, and a gas outlet of the gas heating heat exchanger 8 is connected with an inlet of a gas exhaust receiving device 9; the fuel, oxidant and water propellant enter the fuel gas generator through the injector 6, after premixing, the fuel gas enters the combustion chamber 7 to directly participate in combustion to form high-temperature mixed fuel gas, the mixed fuel gas enters the fuel gas heating heat exchanger 8 through the outlet of the combustion chamber 7 to exchange heat with the supercritical carbon dioxide fluid flowing out of the geothermal energy heating heat exchanger 5, the supercritical carbon dioxide fluid is heated secondarily, and the mixed fuel gas after heat exchange enters the fuel gas exhaust receiving device 9 to be processed. The invention adopts the direct combustion type three-component fuel gas generator, can form mixed fuel gas with the temperature and other parameters adjustable in a large range, has lower gas temperature in the combustion chamber and simpler thermal protection, saves a cooling chamber, and has simpler structure while the fuel gas generator works efficiently and reliably.
The supercritical carbon dioxide (S-CO)2) The recompression Brayton (Brayton) cycle power generation system comprises a high-temperature regenerator 10, a low-temperature regenerator 11, a condenser 12, a main compressor unit 13, a recompression unit 14, a turbine 15 and a generator set 16, wherein an outlet of the turbine 15 is connected with a high-temperature side supercritical carbon dioxide fluid inlet of the high-temperature regenerator 10, a high-temperature side supercritical carbon dioxide fluid outlet of the high-temperature regenerator 10 is connected with a high-temperature side supercritical carbon dioxide fluid inlet of the low-temperature regenerator 11, a high-temperature side supercritical carbon dioxide fluid outlet of the low-temperature regenerator 11 is divided into two paths to be connected with other devices, one path is connected with an inlet of the recompression unit 14, an outlet of the recompression unit 14 is connected with a low-temperature side supercritical carbon dioxide fluid inlet of the high-temperature regenerator 10, the other path is connected with an inlet of the condenser 12, an outlet of the condenser 12 is connected with an inlet of the main compressor unit 13, an outlet of the main compressor unit 13 is connected with, a low-temperature side supercritical carbon dioxide fluid outlet of the low-temperature heat regenerator 11 is connected with a low-temperature side supercritical carbon dioxide fluid inlet of the high-temperature heat regenerator 10, a low-temperature side supercritical carbon dioxide fluid outlet of the high-temperature heat regenerator 10 is connected with an inlet of the geothermal energy heating heat exchanger 5, and an inlet of a turbine 15 is communicated with an outlet of the gas heating heat exchanger 8; carbon dioxide fluid at the outlet of the turbine 15 firstly enters the high-temperature heat regenerator 10 for heat release, then enters the low-temperature heat regenerator 11 for heat exchange again, and then a part of the carbon dioxide fluid directly passes through the recompression unit14 is compressed, the other part of the carbon dioxide fluid firstly enters a condenser 12 for cooling, then enters a main compressor unit for compression, then is reheated to the same temperature as the carbon dioxide fluid directly compressed by a recompression unit 13 through a low-temperature heat regenerator 11, the two fluids are mixed and then flow through a high-temperature heat regenerator 10, a geothermal heating heat exchanger 5 and a gas heating heat exchanger 8, and finally flow into a turbine 15 for acting, and the turbine 15 drives a generator unit 16 to generate power, so that closed circulation is formed.
In renewable energy sources, compared with other renewable energy sources, the geothermal energy has the advantages of low investment and operation cost, high utilization coefficient, almost no influence of weather and climate, stable power generation and the like, so that the geothermal energy has high competitiveness.
The direct combustion type three-component fuel gas generator directly mixes and combusts the traditional two-component propellant and the temperature adjusting medium to form mixed fuel gas with the temperature and other parameters adjustable in a large range, the temperature of gas in the combustion chamber is lower, the thermal protection is simpler, a cooling chamber is omitted, and the structure of the fuel gas generator is simpler while the fuel gas generator works efficiently and reliably.
Supercritical carbon dioxide (S-CO) of the present invention2) Brayton (Brayton) cycle power system, due to supercritical carbon dioxide (S-CO)2) Has high density and no phase change in a certain operating parameter range, and is used as supercritical carbon dioxide (S-CO)2) The power system equipment such as a working medium compressor, a gas turbine and the like has compact structure and smaller volume, thereby saving the cost and the space.
Claims (2)
1. The utility model provides a geothermol power, gas and supercritical carbon dioxide combined power generation system which characterized in that: the system comprises a geothermal heating system, a gas heating system and a supercritical carbon dioxide recompression Brayton cycle power generation system; wherein,
the geothermal heating system comprises a geothermal exploitation well (1), wherein an outlet of the geothermal exploitation well (1) is communicated with an inlet of a water pump (3), an outlet of the water pump (3) is connected with an inlet of a hot water pump (4), an outlet of the hot water pump (4) is connected with a geothermal water inlet of a geothermal energy heating heat exchanger (5), and a geothermal water outlet of the geothermal energy heating heat exchanger (5) is connected with an inlet of a recharge well (2);
the gas heating system comprises an injector (6), an outlet of the injector (6) is connected with an inlet of a combustion chamber (7), an outlet of the combustion chamber (7) is connected with a gas inlet of a gas heating heat exchanger (8), and a gas outlet of the gas heating heat exchanger (8) is connected with an inlet of a gas exhaust receiving device (9);
the supercritical carbon dioxide recompression Brayton cycle power generation system comprises a turbine (15), wherein an outlet of the turbine (15) is connected with a supercritical carbon dioxide fluid inlet at the high temperature side of a high-temperature heat regenerator (10), a supercritical carbon dioxide fluid outlet at the high temperature side of the high-temperature heat regenerator (10) is connected with a supercritical carbon dioxide fluid inlet at the high temperature side of a low-temperature heat regenerator (11), a supercritical carbon dioxide fluid outlet at the high temperature side of the low-temperature heat regenerator (11) is divided into two paths, one path is connected with an inlet of a recompression unit (14), an outlet of the recompression unit (14) is connected with a supercritical carbon dioxide fluid inlet at the low temperature side of the high-temperature heat regenerator (10), the other path is connected with an inlet of a condenser (12), an outlet of the condenser (12) is connected with an inlet of a main compressor unit (13), an outlet of the main compressor unit (13) is connected with a supercritical carbon dioxide fluid inlet at the low temperature, a low-temperature side supercritical carbon dioxide fluid outlet of the low-temperature regenerator (11) is connected with a low-temperature side supercritical carbon dioxide fluid inlet of the high-temperature regenerator (10), a low-temperature side supercritical carbon dioxide fluid outlet of the high-temperature regenerator (10) is connected with a supercritical carbon dioxide fluid inlet of the geothermal energy heating heat exchanger (5), an inlet of a turbine (15) is communicated with a supercritical carbon dioxide fluid outlet of the gas heating heat exchanger (8), and the turbine (15) is used for driving a generator set (16) to generate electricity;
the injector (6) is provided with three inlets, fuel, oxidant and water are respectively introduced, the fuel, oxidant and water propellants enter the combustion chamber (7) through the injector (6) to directly participate in combustion, and the gas generating device adopts a direct combustion type three-component combustion mode to form mixed gas with adjustable temperature and other parameters;
the supercritical carbon dioxide recompression Brayton cycle power generation system uses supercritical carbon dioxide as a working medium;
a first control valve (F1) is arranged on a connecting pipeline between the outlet of the hot water pump (4) and the geothermal water inlet of the geothermal energy heating heat exchanger (5) and is used for controlling the flow of the geothermal water entering the geothermal energy heating heat exchanger (5); a second control valve (F2) and a third control valve (F3) are arranged on a geothermal water outlet of the geothermal energy heating heat exchanger (5) and an inlet connecting pipeline of the recharging well (2) and are respectively used for controlling the flow of geothermal water flowing out of the geothermal energy heating heat exchanger (5) and the flow of geothermal water returning to the recharging well (2); a fourth control valve (F4) is arranged between the outlet of the water pump (3) and the inlet connecting pipeline of the hot water pump (4) and the connecting pipeline of the second control valve (F2) and the third control valve (F3) and is used for preventing geothermal energy from smoothly returning to the recharging well (2) when the geothermal energy heating heat exchanger (5) breaks down.
2. The combined geothermal, gas and supercritical carbon dioxide power generation system of claim 1, wherein: when the system works normally, a first control valve (F1), a second control valve (F2) and a third control valve (F3) are opened, a fourth control valve (F4) is closed, at the moment, hot water in the geothermal exploitation well enters a pipeline communicated with a geothermal energy heating heat exchanger (5) under the action of a water suction pump (3), the hot water enters the geothermal energy heating heat exchanger (5) to exchange heat with supercritical carbon dioxide fluid flowing out of a high-temperature heat regenerator (10) through the work of a hot water pump (4), geothermal water after heat exchange returns to a recharge well (2) through a return channel to form a loop, the second control valve (F2) and the third control valve (F3) on the return channel control the flow rate of the return flow of the geothermal water, when the system fails, the first control valve (F1) and the second control valve (F2) are closed, the third control valve (F3) and the fourth control valve (F4) are opened, at the moment, the geothermal water directly returns to the recharging well (2) without passing through the geothermal energy heating heat exchanger (5);
the fuel, oxidant and water propellant enter the fuel gas generator through the injector (6), after premixing, the fuel gas enters the combustion chamber (7) to directly participate in combustion to form high-temperature mixed fuel gas, the mixed fuel gas enters the fuel gas heating heat exchanger (8) through the outlet of the combustion chamber (7) to exchange heat with the supercritical carbon dioxide fluid flowing out of the geothermal energy heating heat exchanger (5), the supercritical carbon dioxide fluid is heated for the second time, and the mixed fuel gas after heat exchange enters the fuel gas exhaust receiving device (9) to be processed;
the carbon dioxide fluid at the outlet of the turbine (15) enters the high-temperature heat regenerator (10) to release heat, and then enters the low-temperature heat regenerator (11) to exchange heat again, then, one part of the carbon dioxide fluid directly leads to the recompression unit (14) to be compressed, the other part of the carbon dioxide fluid enters the condenser (12) to be cooled first, and then enters the main compressor unit to be compressed, then, the temperature of the carbon dioxide fluid directly compressed by the recompression unit (13) is reached through the heat regeneration of the low-temperature heat regenerator (11) again, the two parts of the carbon dioxide fluid are mixed and then flow through the high-temperature heat regenerator (10), the geothermal heating heat exchanger (5) and the gas heating heat exchanger (8) together, and finally, the carbon dioxide fluid flows into the turbine (15) to do work, the turbine (15) drives the.
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