CN110030048B - S-CO 2 Nuclear power generation system combining cycle and ORC cycle and thermal energy cycle method - Google Patents

S-CO 2 Nuclear power generation system combining cycle and ORC cycle and thermal energy cycle method Download PDF

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CN110030048B
CN110030048B CN201910351284.1A CN201910351284A CN110030048B CN 110030048 B CN110030048 B CN 110030048B CN 201910351284 A CN201910351284 A CN 201910351284A CN 110030048 B CN110030048 B CN 110030048B
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temperature heat
low
heat exchanger
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outlet
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CN110030048A (en
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余万
龚棋超
高丹
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China Three Gorges University CTGU
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China Three Gorges University CTGU
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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
    • 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
    • F01K13/00—General layout or general methods of operation of complete plants
    • 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
    • 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
    • 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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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Engine Equipment That Uses Special Cycles (AREA)

Abstract

A nuclear power generation system combining S-CO2 circulation and ORC circulation and a thermal energy circulation method comprise a heat source loop and S-CO 2 The circulating loop and the ORC loop, a primary loop of the nuclear power plant is used as a heat source loop, and heat is transferred to the S-CO through the high-temperature heat exchanger and the low-temperature heat exchanger respectively 2 Circulation loop and ORC loop, S-CO 2 The cold source of the circulation loop can be used as a low-temperature heat source of the ORC loop to realize gradient utilization of heat energy. S-CO 2 The circulating loop adopts a mode of combining precompression and split recompression, so that the thermal efficiency and net output work of the circulation can be effectively improved.

Description

S-CO 2 Nuclear power generation system combining cycle and ORC cycle and thermal energy cycle method
Technical Field
The invention relates to a nuclear power generation system, in particular to an S-CO 2 A nuclear power generation system combining cycle with ORC cycle and a thermal energy cycle method.
Background
The development of mankind in today's society faces two significant problems: the development of new energy is urgent, the optimal utilization of various energy is also an important research subject of each expert and scholars, and the new clean energy is important in the resource development. The nuclear energy is used as a novel energy source, and is a resource for important development by virtue of the characteristics of cleanness, no pollution and the like, and although the research of the nuclear energy is still focused on the research of nuclear reactors and primary loops nowadays due to the reasons of nuclear radiation, nuclear leakage and the like, the research on the power generation efficiency of the secondary loops is relatively few.
Today, supercritical CO 2 Brayton cycle is common in the utilization of nuclear power generation, but the high temperature heat energy of the primary loop is combined with CO via a high temperature heat exchanger 2 Still has higher temperature after heat exchange, so supercritical CO can be recycled 2 The brayton cycle is combined with an organic rankine cycle to generate electricity. However, supercritical CO 2 After passing through the low temperature regenerator, the heat is cooled, and is taken away by the cooling medium, so that the heat is not well utilized, and heat loss is generated, so that the low temperature regenerator can be considered as an organic light sourceThe preheater of the Kensil cycle is used, so that the energy loss is reduced, and the energy utilization efficiency is improved.
In the prior art, the split-flow recompression brayton cycle and the Rankine cycle are combined for power generation in a two-loop of a nuclear power station, and the split-flow recompression brayton cycle only has high cycle thermal efficiency, but the output work of the cycle is not high, so that the utilization rate of heat energy is not high.
And precompression has higher output power, and the combination of the two can ensure higher output power while the circulation has better circulation heat efficiency.
Disclosure of Invention
The invention aims to solve the technical problems of S-CO 2 The nuclear power generation system and the thermal energy circulation method combining the circulation and ORC circulation can effectively utilize heat exchange heat in the system and improve the circulation heat efficiency.
In order to solve the technical problems, the invention adopts the following technical scheme: S-CO 2 Nuclear power generation system combining cycle and ORC cycle, comprising heat source loop, S-CO 2 A circulation loop and an ORC loop;
the heat source loop comprises a high-temperature heat exchanger, a low-temperature heat exchanger and a coolant pump, wherein a first inlet of the high-temperature heat exchanger is connected with the nuclear reactor, a first outlet of the high-temperature heat exchanger is connected with a first inlet of the low-temperature heat exchanger, and a first outlet of the low-temperature heat exchanger is connected with an inlet of the coolant pump;
the S-CO 2 The circulation loop comprises a high-temperature heat exchanger, a high-temperature heat regenerator, a low-temperature heat regenerator, a cooler, a compressor, a recompressor, a precompressor and a turbine, wherein a second inlet of the high-temperature heat exchanger is connected with a first outlet of the high-temperature heat regenerator, a second outlet of the high-temperature heat exchanger is connected with an inlet of the turbine, a first inlet of the high-temperature heat regenerator is connected with a second outlet of the low-temperature heat regenerator, a second inlet of the high-temperature heat regenerator is connected with an outlet of the turbine, a second outlet of the high-temperature heat regenerator is connected with an inlet of the precompressor, an outlet of the precompressor is connected with a first inlet of the low-temperature heat regenerator, a first outlet of the low-temperature heat regenerator is connected with a first inlet of the cooler, and a first inlet of the low-temperature heat regeneratorThe outlet is connected with the inlet of the recompression, the outlet of the recompression is connected with the second inlet of the low-temperature heat regenerator, the first outlet of the cooler is connected with the inlet of the compressor, and the outlet of the compressor is connected with the second inlet of the low-temperature heat regenerator;
the ORC loop comprises a low-temperature heat exchanger, an expander, a condenser, a working medium pump and a cooler, wherein a second outlet of the low-temperature heat exchanger is connected with an inlet of the expander, a second inlet of the low-temperature heat exchanger is connected with a second outlet of the cooler, an outlet of the expander is connected with an inlet of the condenser, an outlet of the condenser is connected with an inlet of the working medium pump, an outlet of the working medium pump is connected with a second inlet of the cooler, and the condensed saturated working medium is sent into the cooler to be connected with CO through the working medium pump 2 The gas exchanges heat.
In a preferred embodiment, the S-CO 2 Supercritical CO is adopted in a circulation loop 2 As working medium, R123 or R227ea is used in ORC circuit.
In a preferred embodiment, the S-CO 2 The cooler in the circulation loop simultaneously serves as a preheater in the ORC loop for preheating the organic medium.
In a preferred embodiment, the S-CO 2 The organic working medium in the circulation loop is converted into saturated steam or superheated steam through the low-temperature heat exchanger.
In a preferred embodiment, the cooling medium in the condenser is water.
In a preferred embodiment, the turbine is further connected to a first generator, and the expander is further connected to a second generator.
S-CO 2 A method of cycling thermal energy of a nuclear power generation system in combination with an ORC cycle, comprising the steps of:
1) The nuclear reactor heats the coolant and then sends the coolant into a high-temperature heat exchanger for heating;
2) The coolant heats the CO in the high temperature heat exchanger 2 Gas generation of supercritical CO 2 A gas;
3) Supercritical CO 2 The gas is sent into a turbine for working to drive a first generator to generate electricity;
4) Supercritical CO 2 The gas is sent into a turbine to perform work, and simultaneously, the compressor, the recompression machine and the precompressor are driven to perform work;
5) High temperature and low pressure CO after working 2 The gas enters the high-temperature heat regenerator and is output by the low-temperature heat regenerator 2 The gas realizes heat exchange;
6) High temperature and low pressure CO after heat exchange 2 The gas is sent into a precompressor for precompression;
7) Precompressed CO 2 The gas enters a low-temperature heat regenerator to exchange heat with a gas mixed flow passing through a compressor and a recompressor;
8) The gas flow after heat exchange is split, one part enters a compressor after passing through a cooler, and the other part enters a recompressor;
9) CO output by compressor and recompressor 2 After the gases are mixed, the mixed gases respectively absorb the heat of the low-temperature heat regenerator and the high-temperature heat regenerator, and then enter the high-temperature heat exchanger to realize circulation.
In a preferred embodiment, the method further comprises the following steps:
1) Preheating an organic working medium of the ORC through a cooler;
2) Sending the preheated organic working medium into a high-temperature heat exchanger for heating;
3) The coolant after passing through the high-temperature heat exchanger is sent into the low-temperature heat exchanger again to heat the organic working medium;
4) The heated organic working medium is sent into an expander to expand and work, and the second generator is driven to generate electricity;
5) The produced exhaust steam is condensed by a condenser and is absorbed by an expansion machine through a working medium pump 2 CO in circulation 2 Heat in the working medium condensation process;
6) Finally, the mixture enters a low-temperature heat exchanger for heating to form circulation.
In a preferred embodiment, the coolant is fed again into the nuclear reactor after heat exchange by the cryogenic heat exchanger by a coolant pump to absorb heat generated by the nuclear fuel.
The invention provides an S-CO 2 Nuclear power generation combining cycle and ORC cycleBy adopting the structure, the system and the heat energy circulation method can realize recycling of heat exchange heat in the condenser on the premise of fully utilizing heat in a primary loop of the nuclear power plant, and preheat organic working medium in the ORC loop, so that the enthalpy value of the working medium entering the low-temperature heat exchanger is improved, and the heat efficiency of circulation can be improved.
Drawings
The invention is further illustrated by the following examples in conjunction with the accompanying drawings:
FIG. 1 is a block schematic diagram of the present invention.
In the figure: the high-temperature heat exchanger 1, the high-temperature heat regenerator 2, the low-temperature heat regenerator 3, the cooler 4, the compressor 5, the recompressor 6, the precompressor 7, the turbine 8, the low-temperature heat exchanger 9, the expander 10, the condenser 11, the working medium pump 12, the first generator 13, the second generator 14, the nuclear reactor 15 and the coolant pump 16.
Detailed Description
Example 1:
as in FIG. 1, an S-CO 2 Nuclear power generation system combining cycle and ORC cycle, comprising heat source loop, S-CO 2 A circulation loop and an ORC loop;
the heat source loop comprises a high-temperature heat exchanger 1, a low-temperature heat exchanger 9 and a coolant pump 16, wherein a first inlet of the high-temperature heat exchanger 1 is connected with a nuclear reactor 15, a first outlet of the high-temperature heat exchanger 1 is connected with a first inlet of the low-temperature heat exchanger 9, and a first outlet of the low-temperature heat exchanger 9 is connected with an inlet of the coolant pump 16;
the S-CO 2 The circulation loop comprises a high-temperature heat exchanger 1, a high-temperature heat regenerator 2, a low-temperature heat regenerator 3, a cooler 4, a compressor 5, a recompressor 6, a precompressor 7 and a turbine 8, wherein a second inlet of the high-temperature heat exchanger 1 is connected with a first outlet of the high-temperature heat regenerator 2, and receives CO heated by the high-temperature heat regenerator 2 2 The second outlet of the high-temperature heat exchanger 1 is connected with the inlet of the turbine 8 to heat the high-temperature and high-pressure CO 2 The gas is sent into a turbine 8 to do expansion work, a first inlet of the high-temperature heat regenerator 2 is connected with a second outlet of the low-temperature heat regenerator 3, and the CO subjected to heat exchange by the low-temperature heat regenerator 3 is received 2 Gas, high temperature regenerator2 is connected with the outlet of the turbine 8, receives the exhaust steam which is done, the second outlet of the high temperature heat regenerator 2 is connected with the inlet of the precompressor 7, and the exhaust steam is heated by the high temperature heat regenerator 2 and the low temperature CO 2 The exhaust steam after gas heat exchange is precompressed, the outlet of the precompressor 7 is connected with the first inlet of the low-temperature heat regenerator 3, the compressed exhaust steam is sent into the low-temperature heat regenerator for heat exchange, the first outlet of the low-temperature heat regenerator 3 is connected with the first inlet of the cooler 4, the exhaust steam after heat exchange by the low-temperature heat regenerator 3 is condensed, the first outlet of the low-temperature heat regenerator 3 is connected with the inlet of the recompressor 6, and partial CO in the split flow is recovered 2 The gas is compressed, the outlet of the recompression 6 is connected with the second inlet of the low temperature heat regenerator 3, and the recompressed CO is compressed 2 The gas and the cooled compressed gas are mixed and sent into a low-temperature heat regenerator 3, a first outlet of a cooler 4 is connected with an inlet of a compressor 5, the cooled gas is compressed, and an outlet of the compressor 5 is connected with a second inlet of the low-temperature heat regenerator 3 to compress low-temperature high-pressure CO 2 The gas is sent into a low-temperature heat regenerator 3 for absorbing heat;
the ORC loop comprises a low-temperature heat exchanger 9, an expander 10, a condenser 11, a working medium pump 12 and a cooler 4, wherein a second outlet of the low-temperature heat exchanger 9 is connected with an inlet of the expander 10, the working medium heated by the low-temperature heat exchanger 9 is sent into the expander 10 to expand and do work, a second inlet of the low-temperature heat exchanger 9 is connected with a second outlet of the cooler 4, and the working medium is received in the cooler 4 and is connected with CO 2 The outlet of the expander 10 is connected with the inlet of the condenser 11, the exhaust steam which does work is condensed, the outlet of the condenser 11 is connected with the inlet of the working medium pump 12, the outlet of the working medium pump 12 is connected with the second inlet of the cooler 4, and the condensed saturated working medium is sent into the cooler 4 to be connected with CO through the working medium pump 12 2 The gas exchanges heat.
In a preferred embodiment, the S-CO 2 Supercritical CO is adopted in a circulation loop 2 As working medium, organic matters with low boiling point are adopted in the ORC loop as working medium, and R123 or R227ea can be selected.
In a preferred embodiment, S-CO 2 By means of a combination of precompression and recompression in the circulation loopSupercritical CO 2 The pressure of the turbine can be reduced below the critical pressure after expansion work is performed in the turbine, the turbine is compressed to be above the critical pressure through a precompressor, and meanwhile, split-flow recompression is performed to solve the problem of pinch points of the heat exchanger.
In a preferred embodiment, S-CO 2 The circulation loop is provided with a high-temperature heat regenerator and a low-temperature heat regenerator to improve the heat energy utilization efficiency.
In a preferred embodiment, S-CO 2 The compressor, the precompressor and the recompressor are circularly arranged, and the CO is firstly treated 2 The gas is precompressed and then split stream recompressed.
In a preferred embodiment, the S-CO 2 The cooler 4 in the circulation circuit simultaneously serves as a preheater in the ORC circuit for preheating the organic medium.
In a preferred embodiment, the S-CO 2 The organic working medium in the circulation loop is converted into saturated steam or superheated steam through the cryogenic heat exchanger 9.
In a preferred embodiment, the cooling medium in the condenser 11 is water.
In a preferred embodiment, the turbine 8 is further connected to a first generator 13, and the expander 10 is further connected to a second generator 14.
Example 2:
S-CO 2 A method of cycling thermal energy of a nuclear power generation system in combination with an ORC cycle, comprising the steps of:
1) The nuclear reactor 15 heats the coolant and then sends the coolant into the high-temperature heat exchanger 1 for heating;
2) The coolant heats the CO in the high temperature heat exchanger 1 2 Gas generation of supercritical CO 2 A gas;
3) Supercritical CO 2 The gas is sent into a turbine 8 for working to drive a first generator 13 to generate electricity;
4) Supercritical CO 2 The gas is sent into a turbine 8 for working, and simultaneously drives a compressor 5, a recompression 6 and a precompressor 7 for working;
5) High temperature and low pressure CO after working 2 The gas enters the high temperature heat regenerator 2 and the CO output by the low temperature heat regenerator 3 2 The gas realizes heat exchange;
6) High temperature and low pressure CO after heat exchange 2 The gas is sent into a precompressor 7 for precompression;
7) Precompressed CO 2 The gas enters the low-temperature heat regenerator 3 to exchange heat with the gas mixed flow passing through the compressor 5 and the recompressor 6;
8) The gas flow after heat exchange is split, one part enters the compressor 5 after passing through the cooler 4, and the other part enters the recompressor 6;
9) The CO output by compressor 5 and recompressor 6 2 After the gases are mixed, the mixed gases respectively absorb the heat of the low-temperature heat regenerator 3 and the high-temperature heat regenerator 2 and then enter the high-temperature heat exchanger 1 to realize circulation.
In a preferred embodiment, the method further comprises the following steps:
1) Preheating the organic working medium of the ORC by a cooler 4;
2) Sending the preheated organic working medium into a high-temperature heat exchanger 1 for heating;
3) The coolant after passing through the high-temperature heat exchanger 1 is sent into the low-temperature heat exchanger 9 again to heat the organic working medium;
4) The heated organic working medium is sent into the expander 10 to be expanded and worked so as to drive the second generator 14 to generate electricity;
5) The produced exhaust steam is condensed by a condenser 11 and then is sent into an expansion machine 10 to absorb S-CO by a working medium pump 12 2 CO in circulation 2 Heat in the working medium condensation process;
6) Finally, the mixture enters a low-temperature heat exchanger 9 for heating to form circulation.
In a preferred embodiment, the coolant is fed again into the nuclear reactor 15 by a coolant pump 16 after heat exchange by the cryogenic heat exchanger 9 to absorb heat generated by the nuclear fuel.
By adopting the structure and the method, the heat exchange heat in the condenser can be recycled on the premise of fully utilizing the heat in the primary loop of the nuclear power plant, and meanwhile, the organic working medium in the ORC loop is preheated, so that the enthalpy value of the working medium entering the low-temperature heat exchanger is improved, and the heat efficiency of the cycle can be improved.

Claims (7)

1. S-CO 2 A nuclear power generation system combining cycle with ORC cycle, characterized by: comprising a heat source loop and S-CO 2 A circulation loop and an ORC loop;
the heat source loop comprises a high-temperature heat exchanger (1), a low-temperature heat exchanger (9) and a coolant pump (16), wherein a first inlet of the high-temperature heat exchanger (1) is connected with a nuclear reactor (15), a first outlet of the high-temperature heat exchanger (1) is connected with a first inlet of the low-temperature heat exchanger (9), and a first outlet of the low-temperature heat exchanger (9) is connected with an inlet of the coolant pump (16);
the S-CO 2 The circulation loop comprises a high-temperature heat exchanger (1), a high-temperature heat regenerator (2), a low-temperature heat regenerator (3), a cooler (4), a compressor (5), a recompression machine (6), a precompressor (7) and a turbine (8), wherein a second inlet of the high-temperature heat exchanger (1) is connected with a first outlet of the high-temperature heat regenerator (2), a second outlet of the high-temperature heat exchanger (1) is connected with an inlet of the turbine (8), a first inlet of the high-temperature heat regenerator (2) is connected with a second outlet of the low-temperature heat regenerator (3), a second inlet of the high-temperature heat regenerator (2) is connected with an outlet of the turbine (8), a second outlet of the high-temperature heat regenerator (2) is connected with an inlet of the precompressor (7), an outlet of the precompressor (7) is connected with a first inlet of the low-temperature heat regenerator (3), a first outlet of the low-temperature heat regenerator (3) is connected with a first inlet of the cooler (4), a first outlet of the low-temperature heat regenerator (3) is connected with an inlet of the recompression machine (5), and a second outlet of the precompressor (5) is connected with a second inlet of the low-temperature heat regenerator (4);
the ORC loop comprises a low-temperature heat exchanger (9), an expander (10), a condenser (11), a working medium pump (12) and a cooler (4), wherein a second outlet of the low-temperature heat exchanger (9) is connected with an inlet of the expander (10), a second inlet of the low-temperature heat exchanger (9) is connected with a second outlet of the cooler (4), and an outlet of the expander (10) is connected with the condenser @11 An outlet of the condenser (11) is connected with an inlet of the working medium pump (12), an outlet of the working medium pump (12) is connected with a second inlet of the cooler (4), and the condensed saturated working medium is sent into the cooler (4) to be connected with CO through the working medium pump (12) 2 The gas exchanges heat;
the S-CO 2 Supercritical CO is adopted in a circulation loop 2 R123 or R227ea is adopted as a working medium in the ORC loop;
the S-CO 2 The cooler (4) in the circulation loop simultaneously serves as a preheater in the ORC loop for preheating the organic medium.
2. An S-CO according to claim 1 2 A nuclear power generation system combining cycle with ORC cycle, characterized by: the S-CO 2 The organic working medium in the circulation loop is converted into saturated steam or superheated steam through a low-temperature heat exchanger (9).
3. An S-CO according to claim 1 2 A nuclear power generation system combining cycle with ORC cycle, characterized by: the cooling medium in the condenser (11) is water.
4. An S-CO according to claim 1 2 A nuclear power generation system combining cycle with ORC cycle, characterized by: the turbine (8) is also connected to a first generator (13), and the expander (10) is also connected to a second generator (14).
5. An S-CO according to any one of claims 1-4 2 A method of thermal energy cycling of a nuclear power generation system with cycling combined with ORC cycling, comprising the steps of:
1) The nuclear reactor (15) heats the coolant and then sends the coolant into the high-temperature heat exchanger (1) for heating;
2) The coolant heats CO in the high-temperature heat exchanger (1) 2 Gas generation of supercritical CO 2 A gas;
3) Supercritical CO 2 The gas is sent into a turbine (8) for working to drive a first generator (13) to generate electricity;
4) Supercritical CO 2 The gas is sent into a turbine (8) for working, and simultaneously, the compressor (5), the recompression (6) and the precompressor (7) are driven for working;
5) High temperature and low pressure CO after working 2 The gas enters the high-temperature heat regenerator (2) and is CO output by the low-temperature heat regenerator (3) 2 The gas realizes heat exchange;
6) High temperature and low pressure CO after heat exchange 2 The gas is sent into a precompressor (7) for precompression;
7) Precompressed CO 2 The gas enters a low-temperature heat regenerator (3) to exchange heat with a gas mixed flow passing through a compressor (5) and a recompressor (6);
8) The gas flow after heat exchange is split, one part enters a compressor (5) after passing through a cooler (4), and the other part enters a recompressor (6);
9) CO output by the compressor (5) and the recompressor (6) 2 After the gases are mixed, the mixed gases respectively absorb the heat of the low-temperature heat regenerator (3) and the high-temperature heat regenerator (2) and then enter the high-temperature heat exchanger (1) to realize circulation.
6. An S-CO according to claim 5 2 A method of cycling thermal energy of a nuclear power generation system in combination with ORC cycle, further comprising the steps of:
1) Preheating the organic working medium of the ORC by a cooler (4);
2) Sending the preheated organic working medium into a high-temperature heat exchanger (1) for heating;
3) The coolant after passing through the high-temperature heat exchanger (1) is sent into the low-temperature heat exchanger (9) again to heat the organic working medium;
4) The heated organic working medium is sent into an expander (10) for expansion and working, and drives a second generator (14) to generate electricity;
5) The produced exhaust steam is condensed by a condenser (11) and then is sent into an expansion machine by a working medium pump (12)10 Absorption of S-CO 2 CO in circulation 2 Heat in the working medium condensation process;
6) Finally, the mixture enters a low-temperature heat exchanger (9) for heating to form circulation.
7. An S-CO according to claim 6 2 A method of thermal energy cycling of a nuclear power generation system combining cycling with ORC cycling, characterized by: the coolant is fed into the nuclear reactor (15) again by a coolant pump (16) after heat exchange by the cryogenic heat exchanger (9) to absorb heat generated by nuclear fuel.
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