CN114005557A - Efficient dual-cycle sodium-cooled fast reactor power generation system and method for supercritical carbon dioxide reactor - Google Patents
Efficient dual-cycle sodium-cooled fast reactor power generation system and method for supercritical carbon dioxide reactor Download PDFInfo
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- G21C15/18—Emergency cooling arrangements; Removing shut-down heat
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Abstract
The invention discloses a high-efficiency double-cycle sodium-cooled fast reactor power generation system and method for putting supercritical carbon dioxide into a reactor. According to the invention, the high-pressure sodium-supercritical carbon dioxide heat exchanger and the low-pressure sodium-supercritical carbon dioxide heat exchanger are arranged, so that supercritical carbon dioxide is directly fed into the reactor, the temperature of the main gas is increased, and the power generation efficiency is further improved. In addition, by arranging high-pressure and low-pressure supercritical carbon dioxide circulation, the heat absorption temperature interval of the supercritical carbon dioxide power circulation is well matched with the heat release temperature window of the liquid metal sodium, and the power generation efficiency is further improved.
Description
Technical Field
The invention relates to the technical field of high-efficiency nuclear power generation, in particular to a high-efficiency double-cycle sodium-cooled fast reactor power generation system and method for supercritical carbon dioxide reactor loading.
Background
The fourth generation nuclear power technology has the characteristics of nuclear diffusion prevention, better economy, high safety, less waste generation and the like, receives more and more attention, but simultaneously higher heat source temperature also puts higher new requirements on power cycle and working media. The sodium-cooled fast reactor (SFR) is the reactor type with the longest development time and the most mature technology in six types of four-generation reactors, is also the four-generation reactor type verified by practical engineering, and has very excellent application prospect.
The supercritical carbon dioxide cycle power generation technology takes carbon dioxide as a working medium and adopts a real gas closed Brayton cycle mode to generate power, thereby thoroughly changing the power generation mode of taking water and steam as the working medium and adopting Rankine cycle in the traditional thermal power generation technology for over 140 years. Compared with the traditional power generation technology, the supercritical carbon dioxide cycle power generation technology has the advantages of high efficiency, good flexibility, wide applicability, small volume of equipment and a system and the like, and is a revolutionary high-efficiency low-carbon power generation technology with epoch-making significance in the field of thermal power generation.
Therefore, the supercritical carbon dioxide brayton cycle is widely considered as an ideal power generation cycle for the fourth generation advanced nuclear power systems. In addition, the supercritical carbon dioxide is adopted to replace a water working medium, so that the influence of a sodium water reaction on the safety of the nuclear reactor can be effectively avoided, and the safety of the sodium-cooled fast reactor unit can be greatly improved while the power generation efficiency of the unit is improved.
In a traditional sodium-cooled fast reactor supercritical carbon dioxide power generation system, heat of a primary loop is transferred to a secondary loop through a sodium-sodium heat exchanger, heat is transferred to a tertiary loop through the sodium-supercritical carbon dioxide heat exchanger, the tertiary loop is a supercritical carbon dioxide Brayton cycle, and heat-power conversion is finally realized through the tertiary loop. At present, the main not high problem that leads to efficiency that exists among the supercritical carbon dioxide power generation system of traditional sodium-cooled fast reactor includes two aspects: on one hand, a traditional sodium-cooled fast reactor loop setting mode based on water circulation is still adopted, and multi-level heat exchange and final power generation are realized through a first loop, a second loop and a third loop. The whole system needs to undergo two times of indirect heat exchange from a primary loop to a secondary loop and then from the secondary loop to a tertiary loop, and two heat exchange temperature differences exist, so that the temperature of main gas is not high enough, and the efficiency of power circulation is influenced. On the other hand, the matching degree of the endothermic temperature interval of the supercritical carbon dioxide power cycle and the exothermic temperature window of the liquid metal sodium is poor (taking a certain type of sodium-cooled fast reactor in China at present, the temperature of the sodium at the inlet of the reactor core is 360 ℃, the temperature of the sodium at the outlet of the reactor core is 530 ℃, the temperature of the sodium at the inlet of the two loops is about 310 ℃, and the temperature of the sodium at the outlet of the two loops is 495 ℃, therefore, if the temperature of the sodium-supercritical carbon dioxide heat exchanger is matched with the supercritical carbon dioxide power cycle, the temperature rise of the hot side of the sodium-supercritical carbon dioxide heat exchanger is about 185 ℃, for the split-flow recompression supercritical carbon dioxide brayton cycle with higher efficiency which is recognized at present, the stepless full-flow near-isothermal heat regeneration characteristic determines that the average endothermic temperature of the whole power cycle is higher, the endothermic temperature window is narrower, usually about 100 ℃ temperature rise), the liquid metal sodium in the two loops cannot be fully cooled, and the heat in the lower temperature interval cannot be fully utilized, the overall power generation efficiency of the system is seriously influenced.
However, as can be seen from published literature data, although some research on a sodium-cooled fast reactor supercritical carbon dioxide power generation system is currently available, it is rare how to realize direct reactor feeding of supercritical carbon dioxide and good matching between a heat absorption temperature interval of a supercritical carbon dioxide power cycle and a heat release temperature window of liquid metal sodium, and further realize efficient power generation.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention aims to provide a high-efficiency dual-cycle sodium-cooled fast reactor power generation system and method for supercritical carbon dioxide reactor loading. In addition, the high-pressure supercritical carbon dioxide circulation and the low-pressure supercritical carbon dioxide circulation are arranged, so that the heat absorption temperature interval of the supercritical carbon dioxide power circulation is well matched with the heat release temperature window of the liquid metal sodium, and the power generation efficiency is further improved.
In order to achieve the purpose, the invention adopts the technical scheme that:
a high-efficiency double-circulation sodium-cooled fast reactor power generation system with supercritical carbon dioxide reactor comprises a primary loop and a secondary loop; the loop is formed by connecting the reactor 1 with the hot side of the high-pressure sodium-supercritical carbon dioxide heat exchanger 2 and the hot side of the low-pressure sodium-supercritical carbon dioxide heat exchanger 11, wherein the high-pressure sodium-supercritical carbon dioxide heat exchanger 2 and the low-pressure sodium-supercritical carbon dioxide heat exchanger 11 are positioned in the reactor 1; the two loops are supercritical carbon dioxide high-efficiency double-circulation power systems, and specifically comprise high-pressure supercritical carbon dioxide circulation and low-pressure supercritical carbon dioxide circulation.
The high-pressure supercritical carbon dioxide cycle comprises a high-pressure sodium-supercritical carbon dioxide heat exchanger 2, a high-pressure turbine 3, a high-pressure loop generator 4, a high-pressure high-temperature heat regenerator 5, a high-pressure low-temperature heat regenerator 6, a waste heat exchanger 7, a high-pressure precooler 8, a high-pressure main compressor 9 and a high-pressure recompressor 10; the low-pressure supercritical carbon dioxide cycle comprises a low-pressure sodium-supercritical carbon dioxide heat exchanger 11, a low-pressure turbine 12, a low-pressure loop generator 13, a low-pressure heat regenerator 14, a low-pressure precooler 15, a low-pressure compressor 16 and a waste heat exchanger 7.
The high-pressure supercritical carbon dioxide is circulated to absorb high-grade heat from the reactor 1 through the high-pressure sodium-supercritical carbon dioxide heat exchanger 2 and realize heat-power conversion, the low-pressure supercritical carbon dioxide is circulated to absorb medium-low-grade heat from the reactor 1 through the low-pressure sodium-supercritical carbon dioxide heat exchanger 11 and realize heat-power conversion, and waste heat is recycled and utilized through the waste heat exchanger 7 between double circulation.
In the high-pressure supercritical carbon dioxide circulation, the outlet of the cold side of the high-pressure sodium-supercritical carbon dioxide heat exchanger 2 is communicated with the inlet of the high-pressure turbine 3, the outlet of the high-pressure turbine 3 sequentially passes through the hot side of the high-pressure high-temperature heat regenerator 5, the hot side of the high-pressure low-temperature heat regenerator 6 is communicated with the hot side inlet of the waste heat exchanger 7, the hot side outlet of the waste heat exchanger 7 is divided into two paths, one path is communicated with the inlet of a high-pressure main compressor 9 through the hot side of a high-pressure precooler 8, the other path is directly communicated with the inlet of a high-pressure recompressor 10, the outlet of the high-pressure main compressor 9 is communicated with the cold side inlet of the high-pressure low-temperature heat regenerator 6, the cold side outlet of the high-pressure low-temperature heat regenerator 6 is communicated with the cold side inlet of a high-pressure high-temperature heat regenerator 5 after being converged with the outlet of the high-pressure recompressor 10, and the cold side outlet of the high-pressure high-temperature heat regenerator 5 is communicated with the cold side inlet of a high-pressure sodium-supercritical carbon dioxide heat exchanger 2; in the low-pressure supercritical carbon dioxide circulation, the outlet of the cold side of the low-pressure sodium-supercritical carbon dioxide heat exchanger 11 is communicated with the inlet of the low-pressure turbine 12, the outlet of the low-pressure turbine 12 is communicated with the inlet of the low-pressure compressor 16 sequentially through the hot side of the low-pressure heat regenerator 14 and the hot side of the low-pressure precooler 15, and the outlet of the low-pressure compressor 16 is communicated with the inlet of the cold side of the low-pressure sodium-supercritical carbon dioxide heat exchanger 11 sequentially through the cold side of the waste heat exchanger 7 and the cold side of the low-pressure heat regenerator 14.
In the high-pressure supercritical carbon dioxide circulation, a high-pressure turbine 3, a high-pressure loop generator 4, a high-pressure main compressor 9 and a high-pressure recompressor 10 are coaxially arranged; in the low-pressure supercritical carbon dioxide cycle, a low-pressure turbine 12, a low-pressure loop generator 13 and a low-pressure compressor 16 are coaxially arranged.
The invention has the beneficial effects that:
when the efficient double-circulation sodium-cooled fast reactor power generation system with the supercritical carbon dioxide reactor is specifically operated, the supercritical carbon dioxide is adopted to replace the traditional water medium, so that the influence of sodium water reaction on the safety of the nuclear reactor can be effectively avoided, the supercritical carbon dioxide is directly inserted into the reactor by arranging the high-pressure sodium-supercritical carbon dioxide heat exchanger and the low-pressure sodium-supercritical carbon dioxide heat exchanger, a middle loop between the traditional reactor and a power island is omitted, the temperature of main gas is increased, and the power generation efficiency is improved. In addition, the invention solves the problem of matching the heat absorption temperature interval of the supercritical carbon dioxide power cycle with the heat release temperature window of the liquid metal sodium by arranging the high-pressure supercritical carbon dioxide cycle and the low-pressure supercritical carbon dioxide cycle, and further improves the power generation efficiency.
Drawings
FIG. 1 is an overall system diagram of the present invention.
Wherein, 1 is a reactor, 2 is a high-pressure sodium-supercritical carbon dioxide heat exchanger, 3 is a high-pressure turbine, 4 is a high-pressure loop generator, 5 is a high-pressure high-temperature heat regenerator, 6 is a high-pressure low-temperature heat regenerator, 7 is a waste heat exchanger, 8 is a high-pressure precooler, 9 is a high-pressure main compressor, 10 is a high-pressure recompressor, 11 is a low-pressure sodium-supercritical carbon dioxide heat exchanger, 12 is a low-pressure turbine, 13 is a low-pressure loop generator, 14 is a low-pressure heat regenerator, 15 is a low-pressure precooler, and 16 is a low-pressure compressor.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples.
As shown in fig. 1, the high-efficiency dual-cycle sodium-cooled fast reactor power generation system with supercritical carbon dioxide reactor of the present invention comprises a reactor 1, a high-pressure sodium-supercritical carbon dioxide heat exchanger 2, a high-pressure turbine 3, a high-pressure loop generator 4, a high-pressure high-temperature regenerator 5, a high-pressure low-temperature regenerator 6, a waste heat exchanger 7, a high-pressure precooler 8, a high-pressure main compressor 9, a high-pressure recompressor 10, a low-pressure sodium-supercritical carbon dioxide heat exchanger 11, a low-pressure turbine 12, a low-pressure loop generator 13, a low-pressure regenerator 14, a low-pressure precooler 15 and a low-pressure compressor 16.
Wherein, the reactor 1 is connected with the high-pressure sodium-supercritical carbon dioxide heat exchanger 2 and the hot side of the low-pressure sodium-supercritical carbon dioxide heat exchanger 11 to form a primary loop; the high-pressure supercritical carbon dioxide circulation and the low-pressure supercritical carbon dioxide circulation form a two-loop, and the two-loop is a supercritical carbon dioxide high-efficiency double-circulation power system.
The high-pressure supercritical carbon dioxide cycle comprises a high-pressure sodium-supercritical carbon dioxide heat exchanger 2, a high-pressure turbine 3, a high-pressure loop generator 4, a high-pressure high-temperature heat regenerator 5, a high-pressure low-temperature heat regenerator 6, a waste heat exchanger 7, a high-pressure precooler 8, a high-pressure main compressor 9 and a high-pressure recompressor 10; the low-pressure supercritical carbon dioxide cycle comprises a low-pressure sodium-supercritical carbon dioxide heat exchanger 11, a low-pressure turbine 12, a low-pressure loop generator 13, a low-pressure heat regenerator 14, a low-pressure precooler 15, a low-pressure compressor 16 and a waste heat exchanger 7.
The high-pressure supercritical carbon dioxide circularly absorbs high-grade heat from the reactor 1 through the high-pressure sodium-supercritical carbon dioxide heat exchanger 2 and realizes heat-power conversion, the low-pressure supercritical carbon dioxide circularly absorbs medium-low-grade heat from the reactor 1 through the low-pressure sodium-supercritical carbon dioxide heat exchanger 11 and realizes heat-power conversion, and waste heat is recycled and utilized through the waste heat exchanger 7 between double circulation.
In the high-pressure supercritical carbon dioxide circulation, a cold side outlet of a high-pressure sodium-supercritical carbon dioxide heat exchanger 2 is communicated with an inlet of a high-pressure turbine 3, an outlet of the high-pressure turbine 3 is communicated with a hot side inlet of a waste heat exchanger 7 sequentially through a hot side of a high-pressure high-temperature heat regenerator 5 and a hot side of a high-pressure low-temperature heat regenerator 6, the hot side outlet of the waste heat exchanger 7 is divided into two paths, one path is communicated with an inlet of a high-pressure main compressor 9 through the hot side of a high-pressure precooler 8, the other path is directly communicated with an inlet of a high-pressure recompressor 10, an outlet of the high-pressure main compressor 9 is communicated with a cold side inlet of the high-pressure low-temperature heat regenerator 6, a cold side outlet of the high-pressure low-temperature heat regenerator 6 is communicated with a cold side inlet of the high-pressure high-temperature heat regenerator 5 after being converged with an outlet of the high-pressure recompressor 10, and a cold side outlet of the high-pressure high-supercritical carbon dioxide heat regenerator 5 is communicated with a cold side inlet of the high-pressure sodium-supercritical carbon dioxide heat exchanger 2; in the low-pressure supercritical carbon dioxide cycle, the outlet of the cold side of the low-pressure sodium-supercritical carbon dioxide heat exchanger 11 is communicated with the inlet of the low-pressure turbine 12, the outlet of the low-pressure turbine 12 is communicated with the inlet of the low-pressure compressor 16 sequentially through the hot side of the low-pressure heat regenerator 14 and the hot side of the low-pressure precooler 15, and the outlet of the low-pressure compressor 16 is communicated with the inlet of the cold side of the low-pressure sodium-supercritical carbon dioxide heat exchanger 11 sequentially through the cold side of the waste heat exchanger 7 and the cold side of the low-pressure reheater 14.
In the high-pressure supercritical carbon dioxide circulation, a high-pressure turbine 3, a high-pressure loop generator 4, a high-pressure main compressor 9 and a high-pressure recompressor 10 are coaxially arranged; in the low-pressure supercritical carbon dioxide cycle, a low-pressure turbine 12, a low-pressure loop generator 13 and a low-pressure compressor 16 are coaxially arranged.
As a preferred embodiment of the present invention, the high-pressure sodium-supercritical carbon dioxide heat exchanger 2, the high-pressure high-temperature heat regenerator 5, the high-pressure low-temperature heat regenerator 6, the waste heat exchanger 7, the high-pressure precooler 8, the low-pressure sodium-supercritical carbon dioxide heat exchanger 11, the low-pressure heat regenerator 14 and the low-pressure precooler 15 adopt printed circuit board heat exchangers (PCHE) to realize the compactness, high efficiency and low resistance of the heat exchangers under the condition of large heat exchange capacity of the supercritical carbon dioxide brayton cycle; the high-pressure main compressor 9 and the low-pressure compressor 16 work near the critical point of carbon dioxide to ensure that the supercritical carbon dioxide Brayton cycle has higher cycle efficiency.
The specific working process of the invention is as follows:
the high-pressure supercritical carbon dioxide circularly absorbs high-grade heat from the reactor 1 through the high-pressure sodium-supercritical carbon dioxide heat exchanger 2 and realizes heat-power conversion, the low-pressure supercritical carbon dioxide circularly absorbs medium-low-grade heat from the reactor 1 through the low-pressure sodium-supercritical carbon dioxide heat exchanger 11 and realizes heat-power conversion, waste heat recovery and utilization are realized through the waste heat exchanger 7 between double circulation, finally waste heat of the high-pressure supercritical carbon dioxide circulation is discharged to the environment through the high-pressure precooler 8, and waste heat of the low-pressure supercritical carbon dioxide circulation is discharged to the environment through the low-pressure precooler 15.
In the high-pressure supercritical carbon dioxide circulation, the supercritical carbon dioxide at the outlet of the hot side of the waste heat exchanger 7 is divided into two paths, one path of the supercritical carbon dioxide is cooled by the high-pressure precooler 8 and then is boosted by the high-pressure main compressor 9, and then is sent to the cold side of the high-pressure low-temperature heat regenerator 6 for heating, and the other path of the supercritical carbon dioxide is directly boosted by the high-pressure recompressor 10; after the two paths of supercritical carbon dioxide are converged, the two paths of supercritical carbon dioxide are sequentially heated by the cold side of a high-pressure high-temperature regenerator 5 and the cold side of a high-pressure sodium-supercritical carbon dioxide heat exchanger 2; the generated high-temperature high-pressure supercritical carbon dioxide expands in the high-pressure turbine 3 to work, then sequentially passes through the hot side of the high-pressure high-temperature heat regenerator 5 and the hot side of the high-pressure low-temperature heat regenerator 6 and is cooled, and the cooled supercritical carbon dioxide is sent to the hot side inlet of the waste heat exchanger 7, so that closed high-pressure supercritical carbon dioxide power circulation containing split flow recompression is formed.
In the low-pressure supercritical carbon dioxide cycle, supercritical carbon dioxide boosted by a low-pressure compressor 16 sequentially flows through the cold side of a waste heat exchanger 7, the cold side of a low-pressure heat regenerator 14 and the cold side of a low-pressure sodium-supercritical carbon dioxide heat exchanger 11 and is heated, the heated supercritical carbon dioxide expands and works in a low-pressure turbine 12, exhaust gas of the low-pressure turbine 12 sequentially passes through the hot side of the low-pressure heat regenerator 14 and the hot side of a low-pressure precooler 15 and is cooled, and then the supercritical carbon dioxide is sent to the low-pressure compressor 16, so that a closed low-pressure supercritical carbon dioxide power cycle containing heat regeneration is formed.
When the specific operation is adopted, firstly, the high-pressure sodium-supercritical carbon dioxide heat exchanger and the low-pressure sodium-supercritical carbon dioxide heat exchanger are arranged, so that the supercritical carbon dioxide is directly inserted into the reactor, a traditional intermediate loop between the reactor and the power island is eliminated, the temperature of the main gas is increased, and the power generation efficiency is improved. In addition, the high-pressure supercritical carbon dioxide circulation and the low-pressure supercritical carbon dioxide circulation are arranged, so that the heat absorption temperature interval of the supercritical carbon dioxide power circulation is well matched with the heat release temperature window of the liquid metal sodium, and the power generation efficiency is further improved.
The above-mentioned embodiments, objects, technical solutions and advantages of the present invention are further described in detail, it should be understood that the above-mentioned embodiments are only illustrative of the present invention and are not intended to limit the present invention, and any modifications, equivalents, improvements and the like made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (6)
1. A high-efficiency double-circulation sodium-cooled fast reactor power generation system with supercritical carbon dioxide reactor is characterized by comprising a primary loop and a secondary loop; the loop is formed by connecting the reactor (1) with the hot side of the high-pressure sodium-supercritical carbon dioxide heat exchanger (2) and the hot side of the low-pressure sodium-supercritical carbon dioxide heat exchanger (11), wherein the high-pressure sodium-supercritical carbon dioxide heat exchanger (2) and the low-pressure sodium-supercritical carbon dioxide heat exchanger (11) are positioned in the reactor (1); the second loop is a supercritical carbon dioxide high-efficiency dual-cycle power system, and specifically comprises a high-pressure supercritical carbon dioxide cycle and a low-pressure supercritical carbon dioxide cycle;
the high-pressure supercritical carbon dioxide cycle comprises a high-pressure sodium-supercritical carbon dioxide heat exchanger (2), a high-pressure turbine (3), a high-pressure loop generator (4), a high-pressure high-temperature heat regenerator (5), a high-pressure low-temperature heat regenerator (6), a waste heat exchanger (7), a high-pressure precooler (8), a high-pressure main compressor (9) and a high-pressure recompressor (10); the low-pressure supercritical carbon dioxide cycle comprises a low-pressure sodium-supercritical carbon dioxide heat exchanger (11), a low-pressure turbine (12), a low-pressure loop generator (13), a low-pressure heat regenerator (14), a low-pressure precooler (15), a low-pressure compressor (16) and a waste heat exchanger (7);
in the high-pressure supercritical carbon dioxide circulation, a cold side outlet of a high-pressure sodium-supercritical carbon dioxide heat exchanger (2) is communicated with an inlet of a high-pressure turbine (3), an outlet of the high-pressure turbine (3) is communicated with a hot side inlet of a waste heat exchanger (7) sequentially through a hot side of a high-pressure high-temperature heat regenerator (5) and a hot side of a high-pressure low-temperature heat regenerator (6), the hot side outlet of the waste heat exchanger (7) is divided into two paths, one path is communicated with an inlet of a high-pressure main compressor (9) through the hot side of a high-pressure precooler (8), the other path is directly communicated with an inlet of a high-pressure recompressor (10), an outlet of the high-pressure main compressor (9) is communicated with a cold side inlet of the high-pressure low-temperature heat regenerator (6), a cold side outlet of the high-pressure low-temperature heat regenerator (6) is communicated with a cold side inlet of the high-pressure high-temperature heat regenerator (5) after being converged with an outlet of the high-pressure recompressor (10), and a cold side outlet of the high-pressure high-supercritical carbon dioxide heat regenerator (5) is communicated with an inlet of the high-pressure sodium-supercritical carbon dioxide heat exchanger (2) Opening; in the low-pressure supercritical carbon dioxide circulation, a cold side outlet of a low-pressure sodium-supercritical carbon dioxide heat exchanger (11) is communicated with an inlet of a low-pressure turbine (12), an outlet of the low-pressure turbine (12) is communicated with an inlet of a low-pressure compressor (16) through a hot side of a low-pressure heat regenerator (14) and a hot side of a low-pressure precooler (15) in sequence, and an outlet of the low-pressure compressor (16) is communicated with a cold side inlet of the low-pressure sodium-supercritical carbon dioxide heat exchanger (11) through a cold side of a waste heat exchanger (7) and a cold side of the low-pressure reheater (14) in sequence.
2. The efficient double-circulation sodium-cooled fast reactor power generation system with the supercritical carbon dioxide reactor as claimed in claim 1, characterized in that: the high-pressure supercritical carbon dioxide is circulated to absorb high-grade heat from the reactor (1) through the high-pressure sodium-supercritical carbon dioxide heat exchanger (2) and realize heat-power conversion, the low-pressure supercritical carbon dioxide is circulated to absorb medium-low-grade heat from the reactor (1) through the low-pressure sodium-supercritical carbon dioxide heat exchanger (11) and realize heat-power conversion, and waste heat is recycled and utilized through the waste heat exchanger (7) between double cycles.
3. The efficient double-circulation sodium-cooled fast reactor power generation system with the supercritical carbon dioxide reactor as claimed in claim 1, characterized in that: in the high-pressure supercritical carbon dioxide circulation, a high-pressure turbine (3), a high-pressure loop generator (4), a high-pressure main compressor (9) and a high-pressure recompressor (10) are coaxially arranged; in the low-pressure supercritical carbon dioxide cycle, a low-pressure turbine (12), a low-pressure loop generator (13) and a low-pressure compressor (16) are coaxially arranged.
4. The efficient double-circulation sodium-cooled fast reactor power generation system with the supercritical carbon dioxide reactor as claimed in claim 1, characterized in that: the high-pressure sodium-supercritical carbon dioxide heat exchanger (2), the high-pressure high-temperature heat regenerator (5), the high-pressure low-temperature heat regenerator (6), the waste heat exchanger (7), the high-pressure precooler (8), the low-pressure sodium-supercritical carbon dioxide heat exchanger (11), the low-pressure heat regenerator (14) and the low-pressure precooler (15) adopt printed circuit board type heat exchangers.
5. The efficient double-circulation sodium-cooled fast reactor power generation system with the supercritical carbon dioxide reactor as claimed in claim 1, characterized in that: the high-pressure main compressor 9 and the low-pressure compressor 16 work near the critical point of carbon dioxide to ensure that the supercritical carbon dioxide Brayton cycle has higher cycle efficiency.
6. The working method of the supercritical carbon dioxide reactor high-efficiency double-circulation sodium-cooled fast reactor power generation system is characterized by comprising the following steps: high-pressure supercritical carbon dioxide circularly absorbs high-grade heat from a reactor (1) through a high-pressure sodium-supercritical carbon dioxide heat exchanger (2) and realizes heat-work conversion, low-pressure supercritical carbon dioxide circularly absorbs medium-low-grade heat from the reactor (1) through a low-pressure sodium-supercritical carbon dioxide heat exchanger (11) and realizes heat-work conversion, waste heat is recycled and utilized through a waste heat exchanger (7) between double cycles, finally waste heat of the high-pressure supercritical carbon dioxide circulation is discharged to the environment through a high-pressure precooler (8), and waste heat of the low-pressure supercritical carbon dioxide circulation is discharged to the environment through a low-pressure precooler (15);
in the high-pressure supercritical carbon dioxide circulation, the supercritical carbon dioxide at the outlet of the hot side of the waste heat exchanger (7) is divided into two paths, one path of the supercritical carbon dioxide is cooled by a high-pressure precooler (8), then is boosted by a high-pressure main compressor (9), and then is sent to the cold side of a high-pressure low-temperature heat regenerator (6) for heating, and the other path of the supercritical carbon dioxide is directly boosted by a high-pressure recompressor (10); after the two paths of supercritical carbon dioxide are converged, the two paths of supercritical carbon dioxide are sequentially heated by the cold side of a high-pressure high-temperature regenerator (5) and the cold side of a high-pressure sodium-supercritical carbon dioxide heat exchanger (2); after the generated high-temperature high-pressure supercritical carbon dioxide is expanded in the high-pressure turbine (3) to do work, the generated high-temperature high-pressure supercritical carbon dioxide sequentially passes through the hot side of the high-pressure high-temperature heat regenerator (5) and the hot side of the high-pressure low-temperature heat regenerator (6) and is cooled, and the cooled supercritical carbon dioxide is sent to the hot side inlet of the waste heat exchanger (7), so that closed high-pressure supercritical carbon dioxide power circulation containing split flow recompression is formed;
in the low-pressure supercritical carbon dioxide cycle, supercritical carbon dioxide boosted by a low-pressure compressor (16) sequentially flows through the cold side of a waste heat exchanger (7), the cold side of a low-pressure heat regenerator (14) and the cold side of a low-pressure sodium-supercritical carbon dioxide heat exchanger (11) and is heated, the heated supercritical carbon dioxide expands in a low-pressure turbine (12) to do work, exhaust gas of the low-pressure turbine (12) sequentially flows through the hot side of the low-pressure heat regenerator (14) and the hot side of a low-pressure precooler (15) and is cooled, and then the supercritical carbon dioxide is sent into the low-pressure compressor (16), so that the closed low-pressure supercritical carbon dioxide power cycle containing heat regeneration is formed.
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Cited By (2)
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|---|---|---|---|---|
| CN115263477A (en) * | 2022-08-03 | 2022-11-01 | 西安热工研究院有限公司 | Gas-cooled micro-stack energy conversion system and method coupling energy storage and Brayton cycle |
| CN117672559A (en) * | 2023-12-05 | 2024-03-08 | 中国核动力研究设计院 | Power generation system and method for conducting waste heat export by utilizing supercritical carbon dioxide |
-
2021
- 2021-10-29 CN CN202111276921.7A patent/CN114005557A/en not_active Withdrawn
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115263477A (en) * | 2022-08-03 | 2022-11-01 | 西安热工研究院有限公司 | Gas-cooled micro-stack energy conversion system and method coupling energy storage and Brayton cycle |
| CN115263477B (en) * | 2022-08-03 | 2024-05-07 | 西安热工研究院有限公司 | Air-cooled micro-stack energy conversion system and method for coupling energy storage and Brayton cycle |
| CN117672559A (en) * | 2023-12-05 | 2024-03-08 | 中国核动力研究设计院 | Power generation system and method for conducting waste heat export by utilizing supercritical carbon dioxide |
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