CN211903494U - Liquefied air energy storage power generation system coupled with steam-water system of coal-fired power generating unit - Google Patents
Liquefied air energy storage power generation system coupled with steam-water system of coal-fired power generating unit Download PDFInfo
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- CN211903494U CN211903494U CN201922301104.7U CN201922301104U CN211903494U CN 211903494 U CN211903494 U CN 211903494U CN 201922301104 U CN201922301104 U CN 201922301104U CN 211903494 U CN211903494 U CN 211903494U
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- 238000010438 heat treatment Methods 0.000 claims abstract description 37
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- 230000006835 compression Effects 0.000 claims abstract description 29
- 238000000034 method Methods 0.000 claims abstract description 13
- 238000011084 recovery Methods 0.000 claims abstract description 9
- 238000004064 recycling Methods 0.000 claims abstract description 8
- 239000007788 liquid Substances 0.000 claims description 41
- 238000001816 cooling Methods 0.000 claims description 25
- 238000005338 heat storage Methods 0.000 claims description 15
- 230000008569 process Effects 0.000 claims description 11
- 239000007921 spray Substances 0.000 claims description 9
- 239000007789 gas Substances 0.000 claims description 8
- 239000000498 cooling water Substances 0.000 claims description 5
- 239000003245 coal Substances 0.000 claims description 4
- 238000002309 gasification Methods 0.000 claims description 3
- 239000002918 waste heat Substances 0.000 claims description 3
- 239000002699 waste material Substances 0.000 claims description 2
- 230000008878 coupling Effects 0.000 abstract description 6
- 238000010168 coupling process Methods 0.000 abstract description 6
- 238000005859 coupling reaction Methods 0.000 abstract description 6
- 230000009467 reduction Effects 0.000 abstract description 4
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- 238000005516 engineering process Methods 0.000 description 3
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 description 2
- 238000005265 energy consumption Methods 0.000 description 2
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- 238000005086 pumping Methods 0.000 description 2
- 230000001105 regulatory effect Effects 0.000 description 1
- 238000010792 warming Methods 0.000 description 1
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
- F25J1/00—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures
- F25J1/0002—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures characterised by the fluid to be liquefied
- F25J1/0012—Primary atmospheric gases, e.g. air
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
- F25J1/00—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures
- F25J1/003—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures characterised by the kind of cold generation within the liquefaction unit for compensating heat leaks and liquid production
- F25J1/0032—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures characterised by the kind of cold generation within the liquefaction unit for compensating heat leaks and liquid production using the feed stream itself or separated fractions from it, i.e. "internal refrigeration"
- F25J1/004—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures characterised by the kind of cold generation within the liquefaction unit for compensating heat leaks and liquid production using the feed stream itself or separated fractions from it, i.e. "internal refrigeration" by flash gas recovery
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
- F25J1/00—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures
- F25J1/003—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures characterised by the kind of cold generation within the liquefaction unit for compensating heat leaks and liquid production
- F25J1/0032—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures characterised by the kind of cold generation within the liquefaction unit for compensating heat leaks and liquid production using the feed stream itself or separated fractions from it, i.e. "internal refrigeration"
- F25J1/0045—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures characterised by the kind of cold generation within the liquefaction unit for compensating heat leaks and liquid production using the feed stream itself or separated fractions from it, i.e. "internal refrigeration" by vaporising a liquid return stream
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
- F25J1/00—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures
- F25J1/02—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures requiring the use of refrigeration, e.g. of helium or hydrogen ; Details and kind of the refrigeration system used; Integration with other units or processes; Controlling aspects of the process
- F25J1/0201—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures requiring the use of refrigeration, e.g. of helium or hydrogen ; Details and kind of the refrigeration system used; Integration with other units or processes; Controlling aspects of the process using only internal refrigeration means, i.e. without external refrigeration
- F25J1/0202—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures requiring the use of refrigeration, e.g. of helium or hydrogen ; Details and kind of the refrigeration system used; Integration with other units or processes; Controlling aspects of the process using only internal refrigeration means, i.e. without external refrigeration in a quasi-closed internal refrigeration loop
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
- F25J1/00—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures
- F25J1/02—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures requiring the use of refrigeration, e.g. of helium or hydrogen ; Details and kind of the refrigeration system used; Integration with other units or processes; Controlling aspects of the process
- F25J1/0228—Coupling of the liquefaction unit to other units or processes, so-called integrated processes
- F25J1/0235—Heat exchange integration
- F25J1/0242—Waste heat recovery, e.g. from heat of compression
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
- F25J1/00—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures
- F25J1/02—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures requiring the use of refrigeration, e.g. of helium or hydrogen ; Details and kind of the refrigeration system used; Integration with other units or processes; Controlling aspects of the process
- F25J1/0243—Start-up or control of the process; Details of the apparatus used; Details of the refrigerant compression system used
- F25J1/0244—Operation; Control and regulation; Instrumentation
- F25J1/0245—Different modes, i.e. 'runs', of operation; Process control
- F25J1/0251—Intermittent or alternating process, so-called batch process, e.g. "peak-shaving"
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
- F25J2230/00—Processes or apparatus involving steps for increasing the pressure of gaseous process streams
- F25J2230/04—Compressor cooling arrangement, e.g. inter- or after-stage cooling or condensate removal
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
- F25J2230/00—Processes or apparatus involving steps for increasing the pressure of gaseous process streams
- F25J2230/30—Compression of the feed stream
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
- F25J2235/00—Processes or apparatus involving steps for increasing the pressure or for conveying of liquid process streams
- F25J2235/02—Processes or apparatus involving steps for increasing the pressure or for conveying of liquid process streams using a pump in general or hydrostatic pressure increase
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
- F25J2240/00—Processes or apparatus involving steps for expanding of process streams
- F25J2240/70—Steam turbine, e.g. used in a Rankine cycle
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
- F25J2240/00—Processes or apparatus involving steps for expanding of process streams
- F25J2240/90—Hot gas waste turbine of an indirect heated gas for power generation
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- Engineering & Computer Science (AREA)
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- General Engineering & Computer Science (AREA)
- Engine Equipment That Uses Special Cycles (AREA)
Abstract
The utility model relates to a liquefied air energy storage and power generation system coupled with a steam-water system of a coal-fired generator set, which comprises an air compression and condensed water heating system, an air liquefaction energy storage system, an air expansion power generation system and a cold energy recovery and storage system; the air compression and condensed water heating system comprises an air compressor and a heat exchanger; the air liquefaction energy storage system is connected with the air compression and condensed water heating system; the air expansion power generation system is connected with the air liquefaction energy storage system; the cold quantity recycling and storing system is connected with the air expansion power generation system and the air compression and condensed water heating system. The utility model discloses with coal-fired generating set and liquefied air energy storage system coupling, effectively improved the flexibility of thermal power plant's degree of depth peak shaving, guaranteed the whole frequency modulation level of electric wire netting, still can effectively improve coal-fired generating set simultaneously at the safe operation level of degree of depth peak shaving in-process unit, reduction equipment loss.
Description
Technical Field
The utility model belongs to the technical field of energy power, especially, relate to a coal-fired generating set soda system's of coupling liquefied air energy storage power generation system.
Background
The problem of insufficient frequency modulation capacity of a power grid is increasingly highlighted along with continuous grid connection of new energy power such as wind power, photovoltaic power generation and the like. In order to improve the frequency modulation capacity of a power grid, the flexibility and the peak regulation potential of a coal-fired power generating unit need to be improved, and the peak regulation capacity and the new energy consumption capacity of the unit are comprehensively improved.
Large-scale energy storage technology is an important means for regulating the output stability of energy. The large-scale energy storage technologies which are widely concerned at present mainly comprise battery energy storage, pumped storage, compressed air energy storage, liquefied air energy storage and the like. However, water resources are needed for supporting pumped storage, and the requirement of compressed air energy storage on the air storage chamber is high. Compared with water pumping energy storage and compressed air energy storage, the liquefied air energy storage system developed in recent years has many excellent characteristics, such as no limitation of geographical conditions, safe storage under low pressure conditions, operation on existing equipment and the like. Therefore, in order to overcome the problems of the traditional compressed air energy storage and pumped storage, in recent years, scholars at home and abroad successively develop the research on the liquid air energy storage technology, and low-temperature liquid air is taken as an energy storage medium, so that the energy storage density can be obviously improved.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a coal-fired generating set soda system's of coupling liquefied air energy storage power generation system with coal-fired generating set and liquefied air energy storage system coupling, effectively improves the flexibility of thermal power plant's degree of depth peak shaving, guarantees the whole frequency modulation level of electric wire netting, still can effectively improve coal-fired generating set simultaneously at the safe operation level of degree of depth peak shaving in-process unit, reduction equipment loss.
The utility model provides a liquefied air energy storage and power generation system coupled with a steam-water system of a coal-fired generator set, which comprises an air compression and condensed water heating system, an air liquefaction energy storage system, an air expansion power generation system and a cold energy recovery and storage system;
the air compression and condensed water heating system comprises an air compressor and a heat exchanger; the heat exchanger is connected with an air compressor and is used for cooling air compressed by the air compressor; the cooling water inlet of the heat exchanger is connected with the outlet of a condenser of a steam-water system of the coal burner unit; the condensed water outlet of the heat exchanger is connected with the deaerator inlet of a steam-water system of the coal-fired unit and/or the coal economizer inlet of the boiler of the coal-fired unit;
the air liquefaction energy storage system is connected with the air compression and condensed water heating system and is used for cooling and liquefying the compressed air conveyed by the heat exchanger of the air compression and condensed water heating system and storing the liquefied air;
the air expansion power generation system is connected with the air liquefaction energy storage system and is used for performing expansion power generation by utilizing liquefied air stored by the air liquefaction energy storage system and recovering waste steam waste heat at an inlet of a condenser of the coal-fired unit;
the cold energy recycling and storing system is connected with the air expansion power generation system and the air compression and condensed water heating system and is used for recycling and storing cold energy generated in the liquefied air gasification process of the air expansion power generation system and heat generated in the air compression and condensed water heating system in the air compression process.
Further, the air compression and condensed water heating system comprises a small steam turbine, a primary air compressor, a first heat exchanger, a secondary air compressor and a second heat exchanger; the small steam turbine is driven by the high-pressure cylinder of the steam-water system of the coal-fired power generator set through air pumping, and exhaust steam after acting is converged into an inlet of the condenser;
the small steam turbine is sequentially connected with the primary air compressor and the secondary air compressor and is used for driving the primary air compressor and the secondary air compressor to compress air through rotational kinetic energy; the air outlet of the primary air compressor is connected with a secondary air compressor through the first heat exchanger and is used for cooling air compressed by the primary air compressor through the first heat exchanger and then sending the air into the secondary air compressor; the air outlet of the secondary air compressor is connected with the air liquefaction energy storage system through the second heat exchanger and used for sending air at the outlet of the secondary air compressor into the air liquefaction energy storage system after being cooled by the second heat exchanger;
the first heat exchanger and the second heat exchanger are arranged in parallel, the used cooling water is condensed water at an outlet of a condenser of a steam-water system of the coal-fired unit, the condensed water flowing through the first heat exchanger is heated and then flows into an inlet of a deaerator of the steam-water system of the coal-fired unit, and the condensed water flowing through the second heat exchanger is heated and then flows into an inlet of an economizer of a boiler of the coal-fired unit.
Further, the air liquefaction energy storage system comprises a third heat exchanger, a cryogenic refrigerator, a depressurization spray pipe, a gas-liquid separator and a liquid air storage tank; the third heat exchanger is connected with the air outlet of the second heat exchanger and used for sending the air at the outlet of the second heat exchanger into the low-temperature refrigerator for deep cooling after being cooled by the third heat exchanger; the low-temperature refrigerator is connected with the gas-liquid separator through the depressurization spray pipe and is used for sending the deeply cooled air into the gas-liquid separator after depressurization treatment of the depressurization spray pipe; a gas air pipeline and a liquid air pipeline are arranged in the gas-liquid separator, the gas air pipeline is connected with the third heat exchanger and used for cooling air generated by an air compression and condensed water heating system through the gas air, and the cooled air is heated by the third heat exchanger and then is converged into an inlet of the primary air compressor; the liquid air pipeline is connected with the liquid air storage tank and used for sending liquid air into the liquid air storage tank to be stored.
Further, the air expansion power generation system comprises a low-temperature pump, a fourth heat exchanger, a fifth heat exchanger, a sixth heat exchanger, a primary expander, a seventh heat exchanger, a secondary expander and a power generator; the outlet of the liquid air storage tank is connected with the cryogenic pump through a flow valve, the cryogenic pump is sequentially connected with the fourth heat exchanger, the fifth heat exchanger and the sixth heat exchanger, and the cryogenic pump is used for sequentially sending the outlet air of the liquid air storage tank into the fourth heat exchanger, the fifth heat exchanger and the sixth heat exchanger through the flow valve and the cryogenic pump to be heated;
the power output end of the primary expander is connected with the generator, and the secondary expander is connected with the primary expander; the air outlet of the primary expansion machine is connected with the secondary expansion machine through the seventh heat exchanger and used for sending the air heated by the sixth heat exchanger into the primary expansion machine, sending the air which does work by the primary expansion machine into the secondary expansion machine after being heated by the seventh heat exchanger, and driving the generator to generate power through kinetic energy generated by the expansion of high-pressure air in the primary expansion machine and the secondary expansion machine;
the sixth heat exchanger and the seventh heat exchanger are arranged in parallel, are connected with a boiler feed water outlet at the outlet of the feed water pump and are used for heating boiler feed water through the outlet of the feed water pump; outlets of the sixth heat exchanger and the seventh heat exchanger are connected with an inlet of the condenser, and are used for cooling boiler feed water flowing through the sixth heat exchanger and the seventh heat exchanger and then enabling the boiler feed water to flow into the inlet of the condenser; and the fifth heat exchanger is connected with an inlet of a condenser of the coal-fired unit and an outlet of the condenser and used for heating the exhaust steam at the inlet of the condenser of the coal-fired unit, cooling the exhaust steam flowing through the fifth heat exchanger and then converging the exhaust steam into the outlet of the condenser.
Furthermore, the cold energy recycling and storing system comprises a cold storage device and a heat storage device, the third heat exchanger, the fourth heat exchanger of the heat storage device and the cold storage device are sequentially connected to form a closed loop, and flow valves are arranged between the cold storage device and the third heat exchanger and between the heat storage device and the fourth heat exchanger.
By means of the scheme, the coal-fired generator set is coupled with the liquefied air energy storage system through the liquefied air energy storage power generation system coupled with the steam-water system of the coal-fired generator set, so that the flexibility of deep peak shaving of the thermal power plant is effectively improved, the integral frequency modulation level of a power grid is guaranteed, meanwhile, the safe operation level of the unit of the coal-fired generator set in the deep peak shaving process can be effectively improved, and the equipment loss is reduced.
The above description is only an overview of the technical solution of the present invention, and in order to make the technical means of the present invention clearer and can be implemented according to the content of the description, the following detailed description is made with reference to the preferred embodiments of the present invention and accompanying drawings.
Drawings
FIG. 1 is a schematic structural view of a liquefied air energy storage power generation system of a steam-water system of a coupling coal-fired power generating set.
Reference numbers in the figures:
1-small steam engine; 2.1-first stage air compressor; 2.2-a secondary air compressor; 3.1 — a first heat exchanger; 3.2-a second heat exchanger; 3.3-third heat exchanger; 3.4-a fourth heat exchanger; 3.5-fifth heat exchanger; 3.6-sixth heat exchanger; 3.7-seventh heat exchanger; 4.1-first flow valve; 4.2-second flow valve; 4.3-third flow valve; 4.4-fourth flow valve; 4.5-fifth flow valve; 4.6-sixth flow valve; 4.7-seventh flow valve; 5-a cryogenic refrigerator; 6-a depressurization spray pipe; 7-a gas-liquid separator 8-a liquid air storage tank; 9-a cryopump; 10.1-first stage expander; 10.2-secondary expander; 11-a generator; 12-a cold storage device; 13-a heat storage device; p1-high pressure cylinder steam extraction; p2-condenser inlet; p3-deaerator inlet; p4-economizer inlet; p5-condenser outlet; p6-atmospheric environment; p7-feed pump outlet.
Detailed Description
The following detailed description of the embodiments of the present invention is provided with reference to the accompanying drawings and examples. The following examples are intended to illustrate the invention, but are not intended to limit the scope of the invention.
Referring to fig. 1, the embodiment provides a liquefied air energy storage power generation system coupled with a steam-water system of a coal-fired power generation unit, which includes four parts, namely an air compression and condensed water heating system, an air liquefaction energy storage system, an air expansion power generation system and a cold energy recovery and storage system.
The air compression and condensed water heating system is mainly used for pressurizing air at normal temperature and normal pressure to a certain pressure (more than 8 MPa), and simultaneously heating condensed water in a steam-water system of a coal-fired power generating unit by utilizing heat generated in the air compression process. The system consists of a small steam turbine 1, a primary air compressor 2.1, a first heat exchanger 3.1, a secondary air compressor 2.2 and a second heat exchanger 3.2. Wherein the small steam turbine 1 is driven by a high-pressure cylinder in a steam-water system of a coal-fired generator set to pump air, exhaust steam which does work in the small steam turbine 1 is converged into an inlet of a condenser, rotational kinetic energy generated by the small steam turbine 1 is used for driving a primary air compressor 2.1 and a secondary air compressor 2.2 to compress air, the air compressed by the primary air compressor 2.1 is cooled by a first heat exchanger 3.1 and then enters the secondary air compressor 2.2, air at an outlet of the secondary air compressor 2.2 is cooled by a second heat exchanger 3.2 and then enters an air liquefaction energy storage system, wherein the first heat exchanger 3.1 and the second heat exchanger 3.2 are arranged in parallel, the cooling water is condensed water at the outlet of a condenser in a steam system of a coal-fired unit, wherein, the condensed water flowing through the first heat exchanger 3.1 is heated and then flows into the deaerator inlet of the steam system of the coal-fired unit, and the condensed water flowing through the second heat exchanger 3.2 is heated and then flows into the coal-fired unit boiler economizer inlet.
The air liquefaction energy storage system is used for cooling and liquefying high-pressure air generated by the air compression and condensed water heating system and storing the liquefied air. The system consists of a third heat exchanger 3.3, a low-temperature refrigerator 5, a pressure-reducing spray pipe 6, a gas-liquid separator 7 and a liquid air storage tank 8. The air at the outlet of the air compression and condensate water heating system is cooled by a third heat exchanger 3.3 and then enters a low-temperature refrigerator 5 for deep cooling, the air after deep cooling is subjected to pressure reduction treatment by a pressure reduction spray pipe 6 and then enters a gas-liquid separator 7, the air in the gas-liquid separator 7 is divided into two paths of gas and liquid, the gas air returns to the third heat exchanger 3.3 for cooling the air generated by the air compression and condensate water heating system, the air is heated and then flows into an inlet of a first-stage air compressor 2.1, and the liquid air enters a liquid air storage tank 8 for storage.
The air expansion power generation system has the main functions of converting the internal energy stored by the liquefied air into electric energy in an expansion acting mode and simultaneously recovering the waste heat of the exhaust steam at the inlet of the condenser of the coal-fired unit. The system consists of a seventh flow valve 4.7, a cryogenic pump 9, a fourth heat exchanger 3.4, a fifth heat exchanger 3.5, a sixth heat exchanger 3.6, a primary expander 10.1, a seventh heat exchanger 3.7, a secondary expander 10.2 and a generator 11. In the operation process of the air expansion power generation system, air at the outlet of a liquid air storage tank 8 flows through a seventh flow valve 4.7 and then is conveyed through a low-temperature pump 9, the air sequentially enters a fourth heat exchanger 3.4, a fifth heat exchanger 3.5 and a sixth heat exchanger 3.6 to be heated and heated, the heated air enters a primary expander 10.1, the air which does work through the primary expander 10.1 is heated through the seventh heat exchanger 3.7 and then enters a secondary expander 10.2, kinetic energy generated by expansion of high-pressure air in the primary expander 10.1 and the secondary expander 10.2 drives a generator to generate power, the sixth heat exchanger 3.6 and the seventh heat exchanger 3.7 are arranged in parallel and are heated by boiler feed water at the outlet of a feed pump, and the boiler feed water flowing through the sixth heat exchanger 3.6 and the seventh heat exchanger 3.7 is cooled and then flows into the inlet of a condenser. The fifth heat exchanger 3.5 adopts the exhaust steam at the inlet of the condenser of the coal-fired unit to heat, and the exhaust steam flowing through the fifth heat exchanger 3.5 is cooled and then is converged into the outlet of the condenser.
The cold energy storage and recovery system is mainly used for recovering and storing cold energy generated in the liquefied air gasification process in the operation process of the air expansion power generation system and heat generated in the air compression process. The stored cold can be used for cooling the high-pressure air in the air liquefaction energy storage system, so that the refrigerating capacity of the low-temperature refrigerating machine 12 is reduced, the energy-saving effect is achieved, and the stored heat can be used for heating the liquid air in the expansion power generation system. The system consists of a cold storage device 12, a third flow valve 4.4, a heat storage device 13 and a fourth flow valve 4.4. A closed loop is formed by a third heat exchanger 3.3, a heat storage device 13, a fourth flow valve 4.4, a fourth heat exchanger 3.4 and a cold storage device 12 and a third flow valve 4.3 in the system. When the air liquefaction energy storage system operates, a circulating medium in the cold energy storage and recovery system flows through the third heat exchanger 3.3 and then enters the heat storage device 13, heat of the third heat exchanger 3.3 is stored in the heat storage device 13 and then sequentially flows through the fourth flow valve 4.4 and the fourth heat exchanger 3.4 and then enters the cold storage device 12, in the process, the circulating medium does not exchange heat in the fourth heat exchanger 3.4, and the circulating medium 12 carries cold energy and enters the third heat exchanger 3.3 to cool air after passing through the third flow valve 4.3 after entering the cold storage device. When the air expansion power generation system operates, the medium flows through the third heat exchanger 3.3, no heat exchange occurs in the third heat exchanger 3.3, the medium enters the heat storage device 13 after passing through the third heat exchanger 3.3, the medium carries the heat stored in the heat storage device 13 to enter the third heat exchanger 3.3 to heat liquid air, and the cold energy generated in the process of heating the air in the third heat exchanger 3.3 is stored in the cold storage device 12.
When the coal-fired unit bears the peak regulation function of the power grid and needs to reduce the load on the power grid, the air compression and condensed water heating system is started, the output of the compressor is improved by increasing the air extraction amount of the high-pressure cylinder, and meanwhile, the steam amount participating in work doing in the coal-fired unit is reduced, so that the power generation amount of the coal-fired unit is reduced. And simultaneously starting the air liquefaction energy storage system and the cold energy recovery and storage system. The air liquefaction energy storage system is used for cooling and liquefying high-pressure air generated by the air compression and condensed water heating system and storing the high-pressure air in the liquid air storage tank. The cold energy recycling and storing system releases the cold energy stored in the cold storage device through a circulating medium and is used for cooling the high-pressure air from the air compression and condensed water heating system, and meanwhile, the heat released in the high-pressure air cooling process is stored in the heat storage device.
When the coal-fired unit bears the peak regulation function of the power grid and needs to improve the load on the grid, the flow valve at the outlet of the liquid air storage tank is opened, and the air expansion power generation system and the cold energy recovery storage system are started. When the load of the coal-fired unit is slowly lifted, the air expansion power generation system is started to generate power, the internet load of the whole system can be quickly improved, and time is strived for lifting the load of the coal-fired unit. The cold energy recycling and storing system releases the heat stored in the heat storage device through a circulating medium and is used for heating the liquefied air from the liquid air storage tank, and meanwhile, the cold energy released by warming of the liquefied air is stored in the energy storage device.
In order to ensure the overall economy of the system, three systems, namely an air compression and condensed water heating system, an air liquefaction energy storage system and an air expansion power generation system, are not started at the same time.
The liquefied air energy storage power generation system of the steam-water system of the coupling coal-fired power generating set has the following technical effects:
1) condensed water at the outlet of a condenser of the coal-fired generator set is used for cooling air at the outlet of the compressor, and the heated condensed water is respectively gathered into the deaerator inlet and the economizer inlet, so that the cascade utilization of energy is realized, a fixed cold source is provided for the air compression process, the energy consumption of the low-temperature refrigerator is reduced, and the energy-saving effect is achieved;
2) the exhaust steam at the inlet of a condenser of the coal-fired power generating set and the water supply at the outlet of a water supply pump are adopted to heat the inlet air of the primary expander and the inlet air of the secondary expander, so that a stable heat source is provided for the air expansion power generation process, and the independent operation of the energy storage process is ensured;
3) the heat energy in the steam-water system of the coal-fired generator set is converted into the internal energy of the liquefied air and stored, so that the online load of the coal-fired generator set can be quickly reduced, the time is strived for the load adjustment of the coal-fired generator set, the safety and the economy of the coal-fired generator set are ensured, and the flexibility of peak regulation of the coal-fired generator set is improved;
4) after the liquefied air energy storage power generation system is additionally arranged, the online load can be quickly increased when the coal-fired power generation unit operates under a low-load working condition, time is strived for increasing the load of the coal-fired power generation unit, and the operation stability and safety of the coal-fired power generation unit are ensured.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and it should be noted that, for those skilled in the art, a plurality of modifications and variations can be made without departing from the technical principle of the present invention, and these modifications and variations should also be regarded as the protection scope of the present invention.
Claims (5)
1. A liquefied air energy storage power generation system coupled with a steam-water system of a coal-fired power generation unit is characterized by comprising an air compression and condensed water heating system, an air liquefaction energy storage system, an air expansion power generation system and a cold energy recovery and storage system;
the air compression and condensed water heating system comprises an air compressor and a heat exchanger; the heat exchanger is connected with an air compressor and is used for cooling air compressed by the air compressor; the cooling water inlet of the heat exchanger is connected with the outlet of a condenser of a steam-water system of the coal burner unit; the condensed water outlet of the heat exchanger is connected with the deaerator inlet of a steam-water system of the coal-fired unit and/or the coal economizer inlet of the boiler of the coal-fired unit;
the air liquefaction energy storage system is connected with the air compression and condensed water heating system and is used for cooling and liquefying the compressed air conveyed by the heat exchanger of the air compression and condensed water heating system and storing the liquefied air;
the air expansion power generation system is connected with the air liquefaction energy storage system and is used for performing expansion power generation by utilizing liquefied air stored by the air liquefaction energy storage system and recovering waste steam waste heat at an inlet of a condenser of the coal-fired unit;
the cold energy recycling and storing system is connected with the air expansion power generation system and the air compression and condensed water heating system and is used for recycling and storing cold energy generated in the liquefied air gasification process of the air expansion power generation system and heat generated in the air compression and condensed water heating system in the air compression process.
2. The liquefied air energy storage and power generation system coupled with the steam-water system of the coal-fired power generating set according to claim 1, wherein the air compression and condensed water heating system comprises a small steam turbine (1), a primary air compressor (2.1), a first heat exchanger (3.1), a secondary air compressor (2.2) and a second heat exchanger (3.2); the small steam turbine (1) is driven by a high-pressure cylinder of a steam-water system of a coal-fired power generating set to pump air, and exhaust steam after acting is converged into an inlet of a condenser;
the small steam turbine (1) is sequentially connected with the primary air compressor (2.1) and the secondary air compressor (2.2) and is used for driving the primary air compressor (2.1) and the secondary air compressor (2.2) to compress air through rotational kinetic energy; the air outlet of the primary air compressor (2.1) is connected with the secondary air compressor (2.2) through the first heat exchanger (3.1) and is used for cooling the air compressed by the primary air compressor (2.1) through the first heat exchanger (3.1) and then sending the air into the secondary air compressor (2.2); the air outlet of the secondary air compressor (2.2) is connected with the air liquefaction energy storage system through the second heat exchanger (3.2) and used for cooling air at the outlet of the secondary air compressor (2.2) through the second heat exchanger (3.2) and then sending the air into the air liquefaction energy storage system;
the first heat exchanger (3.1) and the second heat exchanger (3.2) are arranged in parallel, the used cooling water is condensed water at an outlet of a steam-water system condenser of the coal-fired unit, the condensed water flowing through the first heat exchanger (3.1) is heated and then flows into an inlet of a deaerator of the steam-water system of the coal-fired unit, and the condensed water flowing through the second heat exchanger (3.2) is heated and then flows into an inlet of a boiler economizer of the coal-fired unit.
3. The liquefied air energy storage and power generation system coupled with the steam-water system of the coal-fired power generating set according to claim 2, wherein the air liquefied energy storage system comprises a third heat exchanger (3.3), a cryogenic refrigerator (5), a depressurization spray pipe (6), a gas-liquid separator (7) and a liquid air storage tank (8); the third heat exchanger (3.3) is connected with an air outlet of the second heat exchanger (3.2) and used for cooling air at the outlet of the second heat exchanger (3.2) by the third heat exchanger (3.3) and then sending the air into the low-temperature refrigerator (5) for deep cooling; the low-temperature refrigerator (5) is connected with the gas-liquid separator (7) through the depressurization spray pipe (6) and is used for sending the deeply cooled air into the gas-liquid separator (7) after depressurization treatment by the depressurization spray pipe (6); a gas air pipeline and a liquid air pipeline are arranged in the gas-liquid separator (7), the gas air pipeline is connected with the third heat exchanger (3.3) and used for cooling air generated by an air compression and condensed water heating system through the gas air, and the cooled air is heated by the third heat exchanger (3.3) and then flows into an inlet of the first-stage air compressor (2.1); the liquid air pipeline is connected with the liquid air storage tank (8) and is used for sending liquid air into the liquid air storage tank (8) for storage.
4. The liquefied air energy storage power generation system coupled with the steam-water system of the coal-fired power generating set according to claim 3, wherein the air expansion power generation system comprises a low-temperature pump (9), a fourth heat exchanger (3.4), a fifth heat exchanger (3.5), a sixth heat exchanger (3.6), a primary expansion machine (10.1), a seventh heat exchanger (3.7), a secondary expansion machine (10.2) and a power generator (22); an outlet of the liquid air storage tank (8) is connected with the cryogenic pump (9) through a flow valve, the cryogenic pump (9) is sequentially connected with the fourth heat exchanger (3.4), the fifth heat exchanger (3.5) and the sixth heat exchanger (3.6), and the liquid air storage tank (8) is used for sequentially sending outlet air into the fourth heat exchanger (3.4), the fifth heat exchanger (3.5) and the sixth heat exchanger (3.6) through the flow valve and the cryogenic pump (9) to be heated;
the power output end of the primary expansion machine (10.1) is connected with the generator, and the secondary expansion machine (10.2) is connected with the primary expansion machine (10.1); the air outlet of the primary expander (10.1) is connected with the secondary expander (10.2) through the seventh heat exchanger (3.7) and is used for sending the air heated and heated by the sixth heat exchanger (3.6) into the primary expander (10.1), sending the air which is worked by the primary expander (10.1) into the secondary expander (10.2) after being heated by the seventh heat exchanger (3.7), and driving the generator to generate power by the kinetic energy generated by the expansion of the high-pressure air in the primary expander (10.1) and the secondary expander (10.2);
the sixth heat exchanger (3.6) and the seventh heat exchanger (3.7) are arranged in parallel, are connected with a boiler feed water outlet at the outlet of the feed water pump and are used for heating boiler feed water at the outlet of the feed water pump; outlets of the sixth heat exchanger (3.6) and the seventh heat exchanger (3.7) are connected with an inlet of the condenser, and are used for cooling boiler feed water flowing through the sixth heat exchanger (3.6) and the seventh heat exchanger (3.7) and then returning the boiler feed water to the inlet of the condenser; and the fifth heat exchanger (3.5) is connected with an inlet of a condenser of the coal-fired unit and an outlet of the condenser and used for heating the exhaust steam at the inlet of the condenser of the coal-fired unit, cooling the exhaust steam flowing through the fifth heat exchanger and then converging the exhaust steam into the outlet of the condenser.
5. The liquefied air energy storage and power generation system coupled with the steam-water system of the coal-fired power generating set according to claim 4, wherein the cold energy recovery and storage system comprises a cold storage device (12) and a heat storage device (13), the third heat exchanger (3.3), the heat storage device (13), the fourth heat exchanger (3.4) and the cold storage device (12) are sequentially connected to form a closed loop, and flow valves are arranged between the cold storage device (12) and the third heat exchanger (3.3) and between the heat storage device (13) and the fourth heat exchanger (3.4).
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111121390A (en) * | 2019-12-19 | 2020-05-08 | 中国大唐集团科学技术研究院有限公司火力发电技术研究院 | Liquefied air energy storage power generation system coupled with steam-water system of coal-fired power generating unit |
| CN113565590A (en) * | 2021-06-18 | 2021-10-29 | 东方电气集团东方汽轮机有限公司 | Compressed air energy storage and coal-fired unit coupled wide-load deep peak shaving power generation system |
| WO2023026052A3 (en) * | 2021-08-27 | 2023-04-20 | Highview Enterprises Limited | High-grade heat-of-compression storage system, and methods of use |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111121390A (en) * | 2019-12-19 | 2020-05-08 | 中国大唐集团科学技术研究院有限公司火力发电技术研究院 | Liquefied air energy storage power generation system coupled with steam-water system of coal-fired power generating unit |
| CN113565590A (en) * | 2021-06-18 | 2021-10-29 | 东方电气集团东方汽轮机有限公司 | Compressed air energy storage and coal-fired unit coupled wide-load deep peak shaving power generation system |
| CN113565590B (en) * | 2021-06-18 | 2023-07-21 | 东方电气集团东方汽轮机有限公司 | Wide-load deep peak shaving power generation system with compressed air energy storage and coal-fired unit coupling |
| WO2023026052A3 (en) * | 2021-08-27 | 2023-04-20 | Highview Enterprises Limited | High-grade heat-of-compression storage system, and methods of use |
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