CN114033519A - Nuclear energy driven three-stage combined cycle power generation system and working method thereof - Google Patents
Nuclear energy driven three-stage combined cycle power generation system and working method thereof Download PDFInfo
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- CN114033519A CN114033519A CN202111470408.1A CN202111470408A CN114033519A CN 114033519 A CN114033519 A CN 114033519A CN 202111470408 A CN202111470408 A CN 202111470408A CN 114033519 A CN114033519 A CN 114033519A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
- F01K25/00—Plants or engines characterised by use of special working fluids, not otherwise provided for; Plants operating in closed cycles and not otherwise provided for
- F01K25/08—Plants or engines characterised by use of special working fluids, not otherwise provided for; Plants operating in closed cycles and not otherwise provided for using special vapours
- F01K25/10—Plants or engines characterised by use of special working fluids, not otherwise provided for; Plants operating in closed cycles and not otherwise provided for using special vapours the vapours being cold, e.g. ammonia, carbon dioxide, ether
- F01K25/103—Carbon dioxide
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- 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
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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
- F01K13/00—General layout or general methods of operation of complete plants
- F01K13/006—Auxiliaries or details not otherwise provided for
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
- F01K23/00—Plants characterised by more than one engine delivering power external to the plant, the engines being driven by different fluids
- F01K23/02—Plants characterised by more than one engine delivering power external to the plant, the engines being driven by different fluids the engine cycles being thermally coupled
- F01K23/04—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 condensation heat from one cycle heating the fluid in another cycle
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- G—PHYSICS
- G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
- G21D—NUCLEAR POWER PLANT
- G21D5/00—Arrangements of reactor and engine in which reactor-produced heat is converted into mechanical energy
- G21D5/04—Reactor and engine not structurally combined
- G21D5/08—Reactor and engine not structurally combined with engine working medium heated in a heat exchanger by the reactor coolant
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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
- Y02E30/00—Energy generation of nuclear origin
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- Mechanical Engineering (AREA)
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- Chemical Kinetics & Catalysis (AREA)
- Plasma & Fusion (AREA)
- High Energy & Nuclear Physics (AREA)
- Engine Equipment That Uses Special Cycles (AREA)
Abstract
The invention discloses a nuclear energy driven three-level combined cycle power generation system and a working method thereof, wherein the nuclear energy driven three-level combined cycle power generation system comprises a nuclear reactor unit, a supercritical carbon dioxide power generation unit, a Rankine cycle power generation unit and an organic Rankine cycle power generation unit; the gas outlet of the reactor is connected with the hot end inlet of the heater, and the hot end outlet of the heater is connected with the gas inlet of the reactor; a carbon dioxide outlet of the heater is sequentially connected with a carbon dioxide turbine, a hot end of the Rankine cycle heater, a hot end of the first organic working medium heater, a hot end of the cooler and a carbon dioxide inlet of the heater; the cold end of the Rankine cycle heater is connected with an input heat source end of the Rankine cycle power generation unit, and the cold end of the first organic working medium heater is connected with an input heat source end of the organic Rankine cycle power generation unit. The three-level combined cycle power generation system constructed by the supercritical carbon dioxide cycle, the Rankine cycle and the organic Rankine cycle driven by nuclear energy is provided, and the power generation efficiency of the nuclear power station is effectively improved.
Description
Technical Field
The invention belongs to the field of nuclear power generation, and relates to a nuclear power driven three-level combined cycle power generation system and a working method thereof.
Background
A High Temperature Gas Cooled Reactor (HTGR) is a graphite moderated helium Cooled Reactor. The high-temperature gas cooled reactor belongs to the fourth generation nuclear power technology, is an advanced reactor type with inherent safety, and has wide application prospect in the fields of power generation, heat supply, hydrogen production, seawater desalination and the like.
Since the high temperature gas cooled reactor can generate steam with higher parameters, the conventional island thermodynamic cycle needs to be improved to match the steam to improve the power generation efficiency. But at present, the power generation efficiency is low mainly in a single-cycle mode of a steam turbine.
Disclosure of Invention
The invention aims to overcome the defects of the prior art, provides a nuclear energy driven three-stage combined cycle power generation system and a working method thereof, provides a nuclear energy driven three-stage combined cycle power generation system constructed by a supercritical carbon dioxide cycle, a Rankine cycle and an organic Rankine cycle, and effectively improves the power generation efficiency of a nuclear power station.
In order to achieve the purpose, the invention adopts the following technical scheme to realize the purpose:
a nuclear energy driven three-level combined cycle power generation system comprises a nuclear reactor unit, a supercritical carbon dioxide power generation unit, a Rankine cycle power generation unit and an organic Rankine cycle power generation unit;
the nuclear reactor unit comprises a reactor and a heater, wherein a gas outlet of the reactor is connected with a hot end inlet of the heater, and a hot end outlet of the heater is connected with a gas inlet of the reactor;
the supercritical carbon dioxide power generation unit comprises a carbon dioxide turbine, a Rankine cycle heater, a first organic working medium heater and a cooler, wherein a carbon dioxide outlet of the heater is sequentially connected with the carbon dioxide turbine, the hot end of the Rankine cycle heater, the hot end of the first organic working medium heater, the hot end of the cooler and a carbon dioxide inlet of the heater; the cold end of the Rankine cycle heater is connected with an input heat source end of the Rankine cycle power generation unit, and the cold end of the first organic working medium heater is connected with an input heat source end of the organic Rankine cycle power generation unit.
Preferably, a carbon dioxide booster pump is arranged between the hot end of the cooler and the inlet of the cold end of the heater.
Further, a preheater is arranged between the hot end of the cooler and the cold end inlet of the heater, and the hot end of the cooler and the cold end inlet of the heater are respectively connected with the cold end inlet and the cold end outlet of the preheater.
Still further, the Rankine cycle power generation unit comprises a steam turbine and a condenser, wherein an inlet of the steam turbine is connected with a cold end outlet of the Rankine cycle heater, an outlet of the steam turbine is connected with an inlet of the condenser, and an outlet of the condenser is connected with a cold end inlet of the Rankine cycle heater.
Furthermore, the outlet of the steam turbine is connected with the hot end inlet of the preheater, and the hot end outlet of the preheater is connected with the inlet of the condenser.
Further, a circulating pump is arranged between the outlet of the condenser and the cold end of the Rankine cycle heater.
Furthermore, the organic Rankine cycle power generation unit comprises an expander, a condenser and a storage tank, an organic working medium outlet of the first organic working medium heater is connected with an inlet of the expander, an organic working medium outlet of the expander is connected with an organic working medium inlet of the condenser, an organic working medium outlet of the condenser is connected with an organic working medium inlet of the storage tank, and an organic working medium outlet of the storage tank is connected with an organic working medium inlet of the organic working medium heater.
And a second organic working medium heater is arranged between the outlet of the steam turbine and the inlet of the condenser, the outlet of the steam turbine is connected with the hot end inlet of the second organic working medium heater, the hot end outlet of the second organic working medium heater is connected with the hot end inlet of the preheater, the organic working medium outlet of the second organic working medium heater is connected with the inlet of the expander, and the organic working medium outlet of the storage tank is connected with the organic working medium inlet of the second organic working medium heater.
An operating method of the nuclear power driven three-stage combined cycle power generation system based on any one of the above processes includes:
high-temperature helium gas from the reactor enters a hot end of a heater, supercritical carbon dioxide at a carbon dioxide end of the heater is heated, then the supercritical carbon dioxide enters a carbon dioxide turbine to do work for power generation, outlet supercritical carbon dioxide enters a Rankine cycle heater to heat working media of a Rankine cycle power generation unit, then enters a first organic working medium heater to serve as a driving heat source of the organic Rankine cycle power generation unit, then the supercritical carbon dioxide working media enter a cooler to be condensed, and then enters a carbon dioxide end of the heater to continue to circulate.
Preferably, supercritical carbon dioxide at the outlet of the carbon dioxide turbine enters the hot end of the Rankine cycle heater to heat working medium water of Rankine cycle, the working medium water enters the steam turbine to do work to generate power, exhaust steam of the steam turbine serves as a heat source of the organic Rankine cycle power generation unit, then the supercritical carbon dioxide at the cold end of the preheater is preheated and then enters the condenser to be condensed, and then the supercritical carbon dioxide is boosted in the recirculating pump and conveyed to the cold end of the Rankine cycle heater to continue to circulate;
organic working media are heated in the cold end of the first organic working medium heater and the cold end of the second organic working medium heater and are conveyed to the expander for power generation, the generated organic working media pass through the condenser and then enter the storage tank, and the organic working media coming out of the storage tank enter the cold end of the first organic working medium heater and the cold end of the second organic working medium heater for recirculation.
Compared with the prior art, the invention has the following beneficial effects:
the invention provides a three-level combined cycle power generation system constructed by supercritical carbon dioxide cycle, Rankine cycle and organic Rankine cycle driven by nuclear energy, so that the power generation efficiency of a nuclear power station is effectively improved; the density of the supercritical carbon dioxide is close to that of liquid, the compression factor of the carbon dioxide near the critical point is only 0.2-0.5, the actual compression work is greatly reduced, and the energy consumption is reduced; the waste heat of the exhaust steam of the supercritical carbon dioxide Brayton cycle is effectively utilized and sequentially used as heat sources of Rankine cycle and organic Rankine cycle, and the energy utilization efficiency is improved.
Furthermore, a back pressure steam turbine is adopted in the Rankine cycle, exhaust waste heat is firstly used as a heat source of the organic Rankine cycle, and then the heat source is provided for the supercritical carbon dioxide cycle preheater, so that the energy utilization efficiency is improved.
Furthermore, the organic Rankine cycle is driven by a back pressure steam turbine exhaust and a supercritical carbon dioxide cycle exhaust, so that the power generation power of the organic Rankine cycle can be effectively improved.
Drawings
FIG. 1 is a schematic diagram of the system of the present invention.
Wherein: 1-a reactor; 2-a heater; 3-carbon dioxide turbine; 4-a rankine cycle heater; 5-a first organic working medium heater; 6-a cooler; 7-a carbon dioxide booster pump; 8-a preheater; 9-a steam turbine; 10-a second organic working medium heater; 11-a condenser; 12-a circulation pump; 13-an expander; 14-a condenser; 15-a storage tank; 16-organic working medium pump.
Detailed Description
The invention is described in further detail below with reference to the accompanying drawings:
as shown in fig. 1, the nuclear energy driven three-stage combined cycle power generation system and apparatus of the present invention includes a nuclear reactor unit, a supercritical carbon dioxide power generation unit, a rankine cycle power generation unit, and an organic rankine cycle power generation unit.
A nuclear reactor unit: high-temperature helium gas from the reactor 1 enters a heater 2 to heat the supercritical carbon dioxide, so that nuclear energy is converted into high-temperature heat energy, and then the supercritical carbon dioxide working medium is transmitted to a supercritical carbon dioxide power generation unit.
The supercritical carbon dioxide power generation unit is used for heating the high-temperature heat energy of the nuclear reactor unit to the working medium supercritical carbon dioxide, and converting the received heat energy into electric energy through the turbine and the generator set and outputting the electric energy. The supercritical carbon dioxide power generation unit includes: the system comprises a carbon dioxide turbine 3, a Rankine cycle heater 4, a first organic working medium heater 5, a cooler 6, a carbon dioxide booster pump 7 and a preheater 8.
The carbon dioxide outlet of the heater 2 is connected with the inlet of the carbon dioxide turbine 3, the outlet of the carbon dioxide turbine 3 is connected with the hot end inlet of the Rankine cycle heater 4, the hot end outlet of the Rankine cycle heater 4 is connected with the hot end inlet of the first organic working medium heater 5, the hot end outlet of the first organic working medium heater 5 is connected with the inlet of the cooler 6, the outlet of the cooler 6 is connected with the inlet of the carbon dioxide booster pump 7, the outlet of the carbon dioxide booster pump 7 is connected with the carbon dioxide inlet of the preheater 8, and the carbon dioxide outlet of the preheater 8 is connected with the carbon dioxide inlet of the heater 2.
The Rankine cycle power generation unit includes: a steam turbine 9, a second organic working medium heater 10, a condenser 11 and a circulating pump 12. Steam turbine 9 adopts the back pressure steam turbine, and rankine cycle heater 4's water outlet links to each other with the entry of steam turbine 99, and the export of steam turbine 9 links to each other with the hot junction entry of second organic working medium heater 10, and the hot junction export of second organic working medium heater 10 links to each other with the hot junction entry of preheater 8, and the hot junction export of preheater 8 links to each other with the entry of condenser 11, and the export of condenser 11 links to each other with the entry of circulating pump 12, and the export of circulating pump 12 links to each other with rankine cycle heater 4's water inlet.
The organic Rankine cycle power generation unit includes: the system comprises an expansion machine 13, a condenser 14, a storage tank 15 and an organic working medium pump 16. Organic working medium outlets of the first organic working medium heater 5 and the second organic working medium heater 10 are respectively connected with inlets of the expansion machines 13, organic working medium outlets of the expansion machines 13 are connected with organic working medium inlets of the condenser 14, organic working medium outlets of the condenser 14 are connected with organic working medium inlets of the storage tank 15, organic working medium outlets of the storage tank 15 are connected with organic working medium inlets of the organic working medium pump 16, and organic working medium outlets of the organic working medium pump 16 are respectively connected with organic working medium inlets of the first organic working medium heater 5 and the second organic working medium heater 10.
The nuclear energy driven three-stage combined cycle power generation system comprises the following working processes:
high-temperature helium from a reactor 1 enters a hot end of a heater 2, a supercritical carbon dioxide working medium enters a carbon dioxide end of the heater 2 and is heated by the helium, then high-temperature and high-pressure working medium supercritical carbon dioxide enters a carbon dioxide turbine 3 to do work for power generation, outlet supercritical carbon dioxide enters a Rankine cycle heater 4 to heat working medium water of Rankine cycle, then enters a first organic working medium heater 5 to serve as a driving heat source of an organic Rankine cycle power generation unit, then the supercritical carbon dioxide working medium enters a cooler 6 to be condensed, then is pressurized in a carbon dioxide booster pump 7, and the outlet carbon dioxide is preheated in a preheater 8 by exhaust steam of the Rankine cycle power generation unit and then enters the heater 2 to continue circulation.
The Rankine cycle power generation unit takes carbon dioxide turbine exhaust of the supercritical carbon dioxide power generation unit as a heat source, working medium water heated by the carbon dioxide turbine exhaust enters a steam turbine 9 to do work for power generation, the exhaust of the steam turbine 9 serves as a heat source of the organic Rankine cycle power generation unit, then supercritical carbon dioxide in the cold end of a preheater 8 in the supercritical carbon dioxide power generation unit is preheated, then the supercritical carbon dioxide enters a condenser to be condensed, and then the pressure is increased in a recirculating pump.
Organic working medium is heated in the cold end of the first organic working medium heater 5 and the cold end of the second organic working medium heater 10 and is conveyed to the expander 13 for power generation, the generated organic working medium enters the storage tank 15 after passing through the condenser 14, and the organic working medium coming out of the storage tank 15 enters the cold end of the first organic working medium heater 5 and the cold end of the second organic working medium heater 10 for recirculation.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solutions of the present invention and not for limiting the same, and although the present invention is described in detail with reference to the above embodiments, those of ordinary skill in the art should understand that: modifications and equivalents may be made to the embodiments of the invention without departing from the spirit and scope of the invention, which is to be covered by the claims.
Claims (10)
1. A nuclear energy driven three-level combined cycle power generation system is characterized by comprising a nuclear reactor unit, a supercritical carbon dioxide power generation unit, a Rankine cycle power generation unit and an organic Rankine cycle power generation unit;
the nuclear reactor unit comprises a reactor (1) and a heater (2), wherein a gas outlet of the reactor (1) is connected with a hot end inlet of the heater (2), and a hot end outlet of the heater (2) is connected with a gas inlet of the reactor (1);
the supercritical carbon dioxide power generation unit comprises a carbon dioxide turbine (3), a Rankine cycle heater (4), a first organic working medium heater (5) and a cooler (6), wherein a carbon dioxide outlet of the heater (2) is sequentially connected with the carbon dioxide turbine (3), the hot end of the Rankine cycle heater (4), the hot end of the first organic working medium heater (5), the hot end of the cooler (6) and a carbon dioxide inlet of the heater (2); the cold end of the Rankine cycle heater (4) is connected with the input heat source end of the Rankine cycle power generation unit, and the cold end of the first organic working medium heater (5) is connected with the input heat source end of the organic Rankine cycle power generation unit.
2. The nuclear powered three stage combined cycle power generating system of claim 1 wherein a carbon dioxide booster pump (7) is provided between the hot side of the cooler (6) and the cold side inlet of the heater (2).
3. The nuclear-driven three-stage combined cycle power generation system according to claim 2, wherein a preheater (8) is arranged between the hot end of the cooler (6) and the cold end inlet of the heater (2), and the hot end of the cooler (6) and the cold end inlet of the heater (2) are respectively connected with the cold end inlet and the cold end outlet of the preheater (8).
4. The nuclear powered three-stage combined cycle power generating system according to claim 3, wherein the Rankine cycle power generating unit comprises a steam turbine (9) and a condenser (11), an inlet of the steam turbine (9) is connected with a cold end outlet of the Rankine cycle heater (4), an outlet of the steam turbine (9) is connected with an inlet of the condenser (11), and an outlet of the condenser (11) is connected with a cold end inlet of the Rankine cycle heater (4).
5. The nuclear powered three stage combined cycle power generating system of claim 4 wherein the outlet of the steam turbine (9) is connected to the hot side inlet of the preheater (8) and the hot side outlet of the preheater (8) is connected to the inlet of the condenser (11).
6. The nuclear powered three stage combined cycle power generating system according to claim 4, characterized in that a circulation pump (12) is arranged between the outlet connection of the condenser (11) to the cold end of the Rankine cycle heater (4).
7. The nuclear-driven three-stage combined cycle power generation system according to claim 4, wherein the organic Rankine cycle power generation unit comprises an expander (13), a condenser (14) and a storage tank (15), an organic working medium outlet of the first organic working medium heater (5) is connected with an inlet of the expander (13), an organic working medium outlet of the expander (13) is connected with an organic working medium inlet of the condenser (14), an organic working medium outlet of the condenser (14) is connected with an organic working medium inlet of the storage tank (15), and an organic working medium outlet of the storage tank (15) is connected with an organic working medium inlet of the organic working medium heater (5).
8. The nuclear-driven three-stage combined cycle power generation system according to claim 7, wherein a second organic working medium heater (10) is arranged between the outlet of the steam turbine (9) and the inlet of the condenser (11), the outlet of the steam turbine (9) is connected with the hot end inlet of the second organic working medium heater (10), the hot end outlet of the second organic working medium heater (10) is connected with the hot end inlet of the preheater (8), the organic working medium outlet of the second organic working medium heater (10) is connected with the inlet of the expander (13), and the organic working medium outlet of the storage tank (15) is connected with the organic working medium inlet of the second organic working medium heater (10).
9. A method of operating a nuclear powered three stage combined cycle power generating system according to any one of claims 1 to 8, comprising the steps of:
high-temperature helium gas from the reactor (1) enters a hot end of a heater (2), supercritical carbon dioxide at a carbon dioxide end of the heater (2) is heated, then the supercritical carbon dioxide enters a carbon dioxide turbine (3) to do work for power generation, outlet supercritical carbon dioxide enters a Rankine cycle heater (4) to heat working media of a Rankine cycle power generation unit, then enters a first organic working medium heater (5) to serve as a driving heat source of the organic Rankine cycle power generation unit, and then the supercritical carbon dioxide working media enter a cooler (6) to be condensed and then enter the carbon dioxide end of the heater (2) to continue to circulate.
10. The operating method of the nuclear energy driven three-level combined cycle power generation system is characterized in that supercritical carbon dioxide at the outlet of the carbon dioxide turbine (3) enters the hot end of the Rankine cycle heater (4) to heat working medium water of Rankine cycle, the working medium water enters the turbine (9) to do work and generate power, exhaust steam of the turbine (9) serves as a heat source of the organic Rankine cycle power generation unit, then the supercritical carbon dioxide at the cold end of the preheater (8) is preheated, then enters the condenser (11) to be condensed, and then is sent to the cold end of the Rankine cycle heater (4) in a boosting mode in the recirculating pump (12) to continue circulation;
organic working media are heated in the cold end of the first organic working medium heater (5) and the cold end of the second organic working medium heater (10) and are conveyed to the expander (13) for power generation, the generated organic working media pass through the condenser (14) and then enter the storage tank (15), and the organic working media coming out of the storage tank (15) enter the cold end of the first organic working medium heater (5) and the cold end of the second organic working medium heater (10) for recirculation.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN118039213A (en) * | 2024-04-15 | 2024-05-14 | 中国科学院合肥物质科学研究院 | Combined power cycle system for fusion reactor and method thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN118039213A (en) * | 2024-04-15 | 2024-05-14 | 中国科学院合肥物质科学研究院 | Combined power cycle system for fusion reactor and method thereof |
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