CN112096470B - Liquid compressed air energy storage peak regulation system and method coupled with heating system - Google Patents
Liquid compressed air energy storage peak regulation system and method coupled with heating system Download PDFInfo
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- CN112096470B CN112096470B CN202011052873.9A CN202011052873A CN112096470B CN 112096470 B CN112096470 B CN 112096470B CN 202011052873 A CN202011052873 A CN 202011052873A CN 112096470 B CN112096470 B CN 112096470B
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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
- F01K7/00—Steam engine plants characterised by the use of specific types of engine; Plants or engines characterised by their use of special steam systems, cycles or processes; Control means specially adapted for such systems, cycles or processes; Use of withdrawn or exhaust steam for feed-water heating
- F01K7/34—Steam engine plants characterised by the use of specific types of engine; Plants or engines characterised by their use of special steam systems, cycles or processes; Control means specially adapted for such systems, cycles or processes; Use of withdrawn or exhaust steam for feed-water heating the engines being of extraction or non-condensing type; Use of steam for feed-water heating
- F01K7/44—Use of steam for feed-water heating and another purpose
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01B—MACHINES OR ENGINES, IN GENERAL OR OF POSITIVE-DISPLACEMENT TYPE, e.g. STEAM ENGINES
- F01B23/00—Adaptations of machines or engines for special use; Combinations of engines with devices driven thereby
- F01B23/10—Adaptations for driving, or combinations with, electric generators
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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
- F01K1/00—Steam accumulators
- F01K1/04—Steam accumulators for storing steam in a liquid, e.g. Ruth's type
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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
- F01K3/00—Plants characterised by the use of steam or heat accumulators, or intermediate steam heaters, therein
- F01K3/14—Plants characterised by the use of steam or heat accumulators, or intermediate steam heaters, therein having both steam accumulator and heater, e.g. superheating accumulator
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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
- F01K7/00—Steam engine plants characterised by the use of specific types of engine; Plants or engines characterised by their use of special steam systems, cycles or processes; Control means specially adapted for such systems, cycles or processes; Use of withdrawn or exhaust steam for feed-water heating
- F01K7/16—Steam engine plants characterised by the use of specific types of engine; Plants or engines characterised by their use of special steam systems, cycles or processes; Control means specially adapted for such systems, cycles or processes; Use of withdrawn or exhaust steam for feed-water heating the engines being only of turbine type
- F01K7/22—Steam engine plants characterised by the use of specific types of engine; Plants or engines characterised by their use of special steam systems, cycles or processes; Control means specially adapted for such systems, cycles or processes; Use of withdrawn or exhaust steam for feed-water heating the engines being only of turbine type the turbines having inter-stage steam heating
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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
- F01K7/00—Steam engine plants characterised by the use of specific types of engine; Plants or engines characterised by their use of special steam systems, cycles or processes; Control means specially adapted for such systems, cycles or processes; Use of withdrawn or exhaust steam for feed-water heating
- F01K7/34—Steam engine plants characterised by the use of specific types of engine; Plants or engines characterised by their use of special steam systems, cycles or processes; Control means specially adapted for such systems, cycles or processes; Use of withdrawn or exhaust steam for feed-water heating the engines being of extraction or non-condensing type; Use of steam for feed-water heating
- F01K7/345—Control or safety-means particular thereto
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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
- F01K7/00—Steam engine plants characterised by the use of specific types of engine; Plants or engines characterised by their use of special steam systems, cycles or processes; Control means specially adapted for such systems, cycles or processes; Use of withdrawn or exhaust steam for feed-water heating
- F01K7/34—Steam engine plants characterised by the use of specific types of engine; Plants or engines characterised by their use of special steam systems, cycles or processes; Control means specially adapted for such systems, cycles or processes; Use of withdrawn or exhaust steam for feed-water heating the engines being of extraction or non-condensing type; Use of steam for feed-water heating
- F01K7/38—Steam engine plants characterised by the use of specific types of engine; Plants or engines characterised by their use of special steam systems, cycles or processes; Control means specially adapted for such systems, cycles or processes; Use of withdrawn or exhaust steam for feed-water heating the engines being of extraction or non-condensing type; Use of steam for feed-water heating the engines being of turbine type
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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
- F01K7/00—Steam engine plants characterised by the use of specific types of engine; Plants or engines characterised by their use of special steam systems, cycles or processes; Control means specially adapted for such systems, cycles or processes; Use of withdrawn or exhaust steam for feed-water heating
- F01K7/34—Steam engine plants characterised by the use of specific types of engine; Plants or engines characterised by their use of special steam systems, cycles or processes; Control means specially adapted for such systems, cycles or processes; Use of withdrawn or exhaust steam for feed-water heating the engines being of extraction or non-condensing type; Use of steam for feed-water heating
- F01K7/40—Use of two or more feed-water heaters in series
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B39/00—Component parts, details, or accessories, of pumps or pumping systems specially adapted for elastic fluids, not otherwise provided for in, or of interest apart from, groups F04B25/00 - F04B37/00
- F04B39/06—Cooling; Heating; Prevention of freezing
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B41/00—Pumping installations or systems specially adapted for elastic fluids
- F04B41/02—Pumping installations or systems specially adapted for elastic fluids having reservoirs
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24D—DOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
- F24D19/00—Details
- F24D19/10—Arrangement or mounting of control or safety devices
- F24D19/1006—Arrangement or mounting of control or safety devices for water heating systems
- F24D19/1009—Arrangement or mounting of control or safety devices for water heating systems for central heating
- F24D19/1015—Arrangement or mounting of control or safety devices for water heating systems for central heating using a valve or valves
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24D—DOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
- F24D3/00—Hot-water central heating systems
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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
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/16—Mechanical energy storage, e.g. flywheels or pressurised fluids
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- Engine Equipment That Uses Special Cycles (AREA)
Abstract
The invention discloses a liquid compressed air energy storage and peak shaving system and method coupled with a heat supply system. In the heating season, the air compression heat is utilized to primarily heat the circulating water of the heat supply network, so that the heat supply steam extraction flow of the unit is reduced; when non-heating season, adopt the condensate water to carry out recycle to the air compression heat to reduce the unit energy consumption. Through the coupling of coal-fired unit heating system and liquid compressed air energy storage system, promote the whole operating efficiency of system. Compared with a conventional liquid compressed air energy storage peak shaving system with a heat storage device, the liquid compressed air peak shaving system adopts an air cooler to recover air compression heat to a unit for thermodynamic cycle, and the configuration of the heat storage system is cancelled. The operation efficiency of the whole system is effectively improved, and the investment of the whole project is reduced.
Description
Technical Field
The invention belongs to the technical field of comprehensive utilization of heat energy, and relates to a liquid compressed air energy storage peak shaving system and method coupled with a heat supply system.
Background
In order to cope with the gradual depletion of fossil fuels and environmental problems caused by the depletion, power generation using renewable energy resources such as wind energy and solar energy has been rapidly developed in recent years. The renewable energy power generation large-scale grid connection with volatility and randomness puts higher requirements on peak clipping and valley filling, and safe and stable operation level of a power grid. The construction of large-scale energy storage devices improves the operation flexibility and safety of the power system, and is an effective way for solving the problem of high-proportion consumption of new energy.
At present, the large-scale energy storage technology mainly comprises pumped storage, compressed air storage and electrochemical storage. The pumped storage technology has high efficiency, but the site selection condition is severe and the construction period is long; the electrochemical energy storage has the problems of short service life, industrial pollution and the like; the compressed air energy storage technology has the characteristics of long service life, small environmental pollution, low operation and maintenance cost and the like, and has large-scale popularization and application potential. Especially, the liquid compressed air energy storage technology realizes the liquid storage of the compressed air by carrying out the cryogenic liquefaction on the air, greatly reduces the storage volume and greatly improves the energy storage density of the system. But the whole energy storage efficiency of the conventional liquid compressed air energy storage system is lower, and the operation cost is higher.
Disclosure of Invention
The invention aims to solve the problems in the prior art and provides a liquid compressed air energy storage peak shaving system and a liquid compressed air energy storage peak shaving method which are coupled with a heating system.
In order to achieve the purpose, the invention adopts the following technical scheme to realize the purpose:
a liquid compressed air energy storage peak shaving system coupled to a heating system, comprising:
the coal-fired unit drives a first generator to generate electricity through a boiler and a steam turbine unit;
the heating system comprises a heating network heater, and the heating network heater is used for heating circulating water return of a heating network; the heat supply network circulating water backwater enters a heat supply network heater for heating, or exchanges heat with compressed air of a liquid compressed air energy storage system firstly, and then enters the heat supply network heater for heating after exchanging heat; the outlet of the heat supply network heater supplies water for the circulating water of the heat supply network;
the liquid compressed air energy storage system comprises an air compressor, wherein the outlet of the air compressor is connected with an air cooler, and the outlet of the air cooler is connected with a refrigeration expander; the air cooler exchanges heat between the compressed air from the air compressor and the circulating water return of the heat supply network or the condensed water from the condenser; the compressed air after heat exchange enters a gas-liquid separation device through a refrigeration expander, a gas outlet of the gas-liquid separation device is connected with an inlet of an air compressor, and a liquid outlet of the gas-liquid separation device is connected with an air storage tank; the outlet of the air storage tank is sequentially connected with the air heater and the steam inlet of the air expander through the booster pump, and the air expander drives the second generator to generate electricity.
The invention further improves the following steps:
the coal-fired unit comprises a boiler, wherein a new steam outlet of the boiler is connected with a steam inlet of a high-pressure cylinder, a steam outlet of the high-pressure cylinder is connected with the boiler, a steam outlet of the boiler is connected with a steam inlet of a medium-pressure cylinder, and a steam outlet of the medium-pressure cylinder is respectively connected with a steam inlet of a low-pressure cylinder and a steam inlet of a heat supply network heater; the steam exhaust port of the low pressure cylinder is sequentially connected with a condenser, a condensate pump, a first low pressure heater, a second low pressure heater, a water feeding pump and a high pressure heater, and the outlet of the high pressure heater is connected with the inlet of the boiler.
And one part of the exhaust steam of the intermediate pressure cylinder enters the low pressure cylinder, and the other part of the exhaust steam enters the heat supply network heater through the first valve group, is used for exchanging heat with the circulating backwater of the heat supply network, and enters the condenser after the heat exchange.
One path of the heat supply network circulating water backwater enters the heat supply network heater through the second valve group, the other path of the heat supply network circulating water backwater enters the air cooler through the third valve group to exchange heat with compressed air, and the heat exchanged water enters the heat supply network heater through the fourth valve group.
And one part of the condensed water at the outlet of the condensed water pump enters the first low-pressure heater, the other part of the condensed water enters the air cooler through the fifth valve group to exchange heat with the compressed air, and the condensed water enters the second low-pressure heater through the sixth valve group after the heat exchange.
A liquid compressed air energy storage peak regulation method coupled with a heating system comprises the following steps:
in the heating season, the first valve group, the third valve group and the fourth valve group are opened, and the second valve group, the fifth valve group and the sixth valve group are closed; the method comprises the following steps that (1) the circulating backwater of the heat supply network firstly enters an air cooler, absorbs air compression heat and rises the temperature, and then enters a heat supply network heater for secondary heating until the temperature of the circulating backwater of the heat supply network reaches the temperature required by external heat supply; when the air compression process of the liquid compressed air energy storage system is stopped, closing the third valve group and the fourth valve group, opening the second valve group, directly feeding the circulating water of the heat supply network into the heat supply network heater, and heating the circulating water of the heat supply network by steam extraction of the coal-fired unit until the temperature of the circulating water of the heat supply network reaches the heat supply temperature and then supplying the circulating water of the heat supply network to the outside;
in non-heating seasons, closing the first valve group, the second valve group, the third valve group and the fourth valve group, and opening the fifth valve group and the sixth valve group; and guiding a part of condensed water at the outlet of the condensed water pump to the air cooler, absorbing the heat of air compression, heating and returning to the second low-pressure heater.
Compared with the prior art, the invention has the following beneficial effects:
the invention recovers the air compression heat of the liquid compressed air energy storage system through the heat supply system. In the heating season, the air compression heat is utilized to primarily heat the circulating water of the heat supply network, so that the heat supply steam extraction flow of the unit is reduced; when non-heating season, adopt the condensate water to carry out recycle to the air compression heat to reduce the unit energy consumption. Through the coupling of coal-fired unit heating system and liquid compressed air energy storage system, promote the whole operating efficiency of system. Compared with a conventional liquid compressed air energy storage peak shaving system with a heat storage device, the liquid compressed air peak shaving system adopts an air cooler to recover air compression heat to a unit for thermodynamic cycle, and the configuration of the heat storage system is cancelled. The operation efficiency of the whole system is effectively improved, and the investment of the whole project is reduced.
Drawings
In order to more clearly explain the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention, and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.
FIG. 1 is a schematic diagram of the system of the present invention.
Wherein: 1-a boiler; 2-high pressure cylinder; 3-a medium pressure cylinder; 4-low pressure cylinder; 5-a first generator; 6-a condenser; 7-a condensate pump; 8-a first low pressure heater; 9-a second low pressure heater; 10-a feed pump; 11-a high pressure heater; 12-a heating network heater; 13-a first valve group; 14-a second valve group; 15-a third valve group; 16-a fourth valve group; 17-a fifth valve group; 18-sixth valve group; 19-an air compressor; 20-an air cooler; 21-a refrigeration expander; 22-a gas-liquid separation device; 23-an air reservoir; 24-a booster pump; 25-an air heater; 26-an air expander; 27-a second generator.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be obtained by a person skilled in the art without inventive step based on the embodiments of the present invention, are within the scope of protection of the present invention.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.
In the description of the embodiments of the present invention, it should be noted that if the terms "upper", "lower", "horizontal", "inner", etc. are used for indicating the orientation or positional relationship based on the orientation or positional relationship shown in the drawings or the orientation or positional relationship which is usually arranged when the product of the present invention is used, the description is merely for convenience and simplicity, and the indication or suggestion that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and thus, cannot be understood as limiting the present invention. Furthermore, the terms "first," "second," and the like are used solely to distinguish one from another, and are not to be construed as indicating or implying relative importance.
Furthermore, the term "horizontal", if present, does not mean that the component is required to be absolutely horizontal, but may be slightly inclined. For example, "horizontal" merely means that the direction is more horizontal than "vertical" and does not mean that the structure must be perfectly horizontal, but may be slightly inclined.
In the description of the embodiments of the present invention, it should be further noted that unless otherwise explicitly stated or limited, the terms "disposed," "mounted," "connected," and "connected" should be interpreted broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
The invention is described in further detail below with reference to the accompanying drawings:
referring to fig. 1, the invention relates to a liquid compressed air energy storage peak shaving system coupled with a heating system, which comprises a coal-fired generator set, a liquid compressed air energy storage system and a heating system. The system specifically comprises a boiler 1, a high-pressure cylinder 2, an intermediate-pressure cylinder 3, a low-pressure cylinder 4, a first generator 5, a condenser 6, a condensate pump 7, a first low-pressure heater 8, a second low-pressure heater 9, a feed water pump 10, a high-pressure heater 11, a heat supply network heater 12, a first valve group 13, a second valve group 14, a third valve group 15, a fourth valve group 16, a fifth valve group 17, a sixth valve group 18, an air compressor 19, an air cooler 20, a refrigeration expander 21, a gas-liquid separation device 22, an air storage tank 23, a booster pump 24, an air heater 25, an air expander 26 and a second generator 27.
The new steam at the outlet of the boiler 1 enters the high pressure cylinder 2 to do work and then returns to the boiler 1 to be heated for the second time, and then enters the intermediate pressure cylinder 3 and the low pressure cylinder 4 in sequence to do work through expansion, so that the first generator 5 is driven to generate power. And the discharged steam of the low-pressure cylinder 4 enters a condenser 6 for condensation, then is subjected to pressure boosting through a condensate pump 7, then is heated and heated sequentially through a first low-pressure heater 8 and a second low-pressure heater 9, then is subjected to pressure boosting through a water feed pump 10 and is heated through a high-pressure heater 11, and then returns to the boiler, so that the steam-water circulation of the coal-fired unit is completed.
When the liquid compressed air energy storage system operates in an energy storage mode, air enters the air compressor 19 to be pressurized, outlet high-pressure air enters the air cooler 20 to be cooled and release heat, then enters the refrigeration expander 21 to be cooled deeply, gas air and liquid air are separated in the gas-liquid separation device 22, the liquid air is stored in the air storage tank 23, and the separated gas air returns to the inlet of the air compressor 19 to be compressed again. And finishing the air compression liquefaction energy storage process of the liquid compressed air energy storage system.
When the liquid compressed air energy storage system operates in the energy-releasing and power-generating mode, liquid air at the outlet of the air storage tank 23 is pressurized by the booster pump 24 and then enters the air heater 25 to be heated, and then enters the air expander 26 to be expanded and do work to drive the second generator 27 to generate power, so that the power-generating and energy-releasing process of the liquid compressed air energy storage system is completed.
The invention relates to a liquid compressed air energy storage peak shaving method coupled with a heat supply system of a coal-fired unit. The specific method comprises the following steps:
in the heating season, the first valve group 13, the third valve group 15, and the fourth valve group 16 are opened, and the second valve group 14, the fifth valve group 17, and the sixth valve group 18 are closed. The return water of the heat supply network circulation firstly enters the air cooler 20, absorbs the compression heat of the air, heats up, and then enters the heat supply network heater 12 to be heated secondarily to the temperature required by the external heat supply. The air compression heat is adopted to preliminarily heat the circulating water of the heat supply network, so that the heating steam extraction amount is reduced, and the heat supply energy consumption of a unit is reduced. When the air compression process of the liquid compressed air energy storage system stops, the third valve group 15 and the fourth valve group 16 are closed, the second valve group 14 is opened, the circulating water return of the heat supply network directly enters the heat supply network heater 12, and the circulating water return is heated to the heat supply temperature by the steam extraction of the unit and then is supplied to the outside.
In the non-heating season, the first valve group 13, the second valve group 14, the third valve group 15, and the fourth valve group 16 are closed, and the fifth valve group 17 and the sixth valve group 18 are opened. And a part of condensed water at the outlet of the condensed water pump 7 is led to the air cooler 20, absorbs the heat of air compression, and returns to the inlet of the second low-pressure heater 9 after the temperature is raised. And the condensed water of the heat heating part is compressed by air, so that the steam extraction amount of the first low-pressure heater 8 is reduced, and the energy consumption of the unit is reduced.
The above is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes will occur to those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (1)
1. A method of peak shaving of a liquid compressed air energy storage coupled to a heating system, the method being based on a liquid compressed air energy storage peak shaving system coupled to the heating system, comprising:
the system comprises a coal-fired unit, a first generator (5) and a second generator, wherein the coal-fired unit drives the first generator (5) to generate electricity through a boiler (1) and a steam turbine unit; the coal-fired unit comprises a boiler (1), wherein a new steam outlet of the boiler (1) is connected with a steam inlet of a high-pressure cylinder (2), a steam outlet of the high-pressure cylinder (2) is connected with the boiler (1), a steam outlet of the boiler (1) is connected with a steam inlet of a medium-pressure cylinder (3), and a steam outlet of the medium-pressure cylinder (3) is respectively connected with a steam inlet of a low-pressure cylinder (4) and a steam inlet of a heat supply network heater (12); a steam exhaust port of the low pressure cylinder (4) is sequentially connected with a condenser (6), a condensate pump (7), a first low pressure heater (8), a second low pressure heater (9), a water feeding pump (10) and a high pressure heater (11), and an outlet of the high pressure heater (11) is connected with an inlet of the boiler (1); one part of the exhaust steam of the intermediate pressure cylinder (3) enters the low pressure cylinder (4), and the other part of the exhaust steam enters the heat supply network heater (12) through the first valve group (13) and is used for exchanging heat with the circulating water return of the heat supply network, and then enters the condenser (6) after the heat exchange;
the heating system comprises a heating network heater (12), and the heating network heater (12) is used for heating circulating backwater of the heating network; the heat supply network circulating water backwater enters a heat supply network heater (12) for heating, or exchanges heat with compressed air of a liquid compressed air energy storage system firstly, and then enters the heat supply network heater (12) for heating after exchanging heat; the outlet of the heat supply network heater (12) supplies water for the circulating water of the heat supply network; one path of the circulating water return of the heat supply network enters a heat supply network heater (12) through a second valve group (14), the other path of the circulating water return enters an air cooler (20) through a third valve group to exchange heat with compressed air, and the circulating water return enters the heat supply network heater (12) through a fourth valve group (16) after heat exchange;
the liquid compressed air energy storage system comprises an air compressor (19), wherein the outlet of the air compressor (19) is connected with an air cooler (20), and the outlet of the air cooler (20) is connected with a refrigeration expansion machine (21); the air cooler (20) exchanges heat between the compressed air from the air compressor (19) and the circulating water return of the heat supply network or the condensed water from the condenser (6); the compressed air after heat exchange enters a gas-liquid separation device (22) through a refrigeration expander (21), a gas outlet of the gas-liquid separation device is connected with an inlet of an air compressor (19), and a liquid outlet is connected with an air storage tank (23); an outlet of the air storage tank (23) is sequentially connected with an air heater (25) and an air inlet of an air expander (26) through a booster pump (24), and the air expander (26) drives a second generator (27) to generate electricity; one part of condensed water at the outlet of the condensed water pump (7) enters a first low-pressure heater (8), the other part of the condensed water enters an air cooler (20) through a fifth valve group (17) to exchange heat with compressed air, and the condensed water enters a second low-pressure heater (9) through a sixth valve group (18) after heat exchange; characterized in that the method comprises the steps of:
in the heating season, the first valve group (13), the third valve group (15) and the fourth valve group (16) are opened, and the second valve group (14), the fifth valve group (17) and the sixth valve group (18) are closed; the method comprises the following steps that the circulating backwater of the heat supply network firstly enters an air cooler (20), absorbs air compression heat and raises the temperature, and then enters a heat supply network heater (12) for secondary heating until the temperature of the circulating backwater of the heat supply network reaches the temperature required by external heat supply; when the air compression process of the liquid compressed air energy storage system is stopped, the third valve group (15) and the fourth valve group (16) are closed, the second valve group (14) is opened, the circulating water return of the heat supply network directly enters the heat supply network heater (12), the coal-fired unit extracts steam to heat the circulating water return of the heat supply network until the temperature of the circulating water return of the heat supply network reaches the heat supply temperature, and then the circulating water return of the heat supply network is supplied to the outside;
in non-heating seasons, the first valve group (13), the second valve group (14), the third valve group (15) and the fourth valve group (16) are closed, and the fifth valve group (17) and the sixth valve group (18) are opened; and a part of condensed water at the outlet of the condensed water pump (7) is led to the air cooler (20), absorbs the heat of air compression, and returns to the second low-pressure heater (9) after the temperature is raised.
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| CN113565591B (en) * | 2021-07-29 | 2023-05-30 | 西安热工研究院有限公司 | Combined heat and power unit coupling air energy storage expansion power generation system and optimal operation method |
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| CN114151313B (en) * | 2021-12-02 | 2023-10-13 | 西安热工研究院有限公司 | Coupling compressed air energy storage system of gas generator set and operation method thereof |
| CN114963281B (en) * | 2022-05-25 | 2023-08-25 | 哈尔滨工业大学 | Combined heat and power generation system with energy storage system and coal-fired unit coupled and operation method |
| CN115095899B (en) * | 2022-06-30 | 2024-04-09 | 华能国际电力股份有限公司上安电厂 | Coal-fired unit coupled compressed air energy storage waste heat supply system and operation method |
| CN116202128B (en) * | 2023-02-23 | 2023-10-03 | 中国电建集团河北省电力勘测设计研究院有限公司 | Method for heating by utilizing compressed air energy storage compression heat waste heat |
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| CN104675458B (en) * | 2015-02-09 | 2016-01-20 | 山东大学 | The cogeneration type compressed-air energy-storage system of back pressure type thermoelectricity unit and method |
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