CN112065516A - Liquid compressed air energy storage and peak regulation system and method for steam heat gradient utilization - Google Patents
Liquid compressed air energy storage and peak regulation system and method for steam heat gradient utilization Download PDFInfo
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- CN112065516A CN112065516A CN202011053200.5A CN202011053200A CN112065516A CN 112065516 A CN112065516 A CN 112065516A CN 202011053200 A CN202011053200 A CN 202011053200A CN 112065516 A CN112065516 A CN 112065516A
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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steam systems, cycles or processes; Control means specially adapted for such systems, cycles or processes; Use of withdrawn or exhaust steam for feed-water heating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steam systems, cycles or processes; Control means specially adapted for such systems, cycles or processes; Use of withdrawn or exhaust steam for feed-water heating the engines being only of turbine type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steam systems, cycles or processes; Control means specially adapted for such systems, cycles or processes; Use of withdrawn or exhaust steam for feed-water heating the engines being only of turbine type the turbines having inter-stage steam heating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
- 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
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D15/00—Adaptations of machines or engines for special use; Combinations of engines with devices driven thereby
- F01D15/10—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
- F01K7/34—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
- 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
- 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
- F22—STEAM GENERATION
- F22D—PREHEATING, OR ACCUMULATING PREHEATED, FEED-WATER FOR STEAM GENERATION; FEED-WATER SUPPLY FOR STEAM GENERATION; CONTROLLING WATER LEVEL FOR STEAM GENERATION; AUXILIARY DEVICES FOR PROMOTING WATER CIRCULATION WITHIN STEAM BOILERS
- F22D1/00—Feed-water heaters, i.e. economisers or like preheaters
- F22D1/50—Feed-water heaters, i.e. economisers or like preheaters incorporating thermal de-aeration of feed-water
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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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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Engine Equipment That Uses Special Cycles (AREA)
Abstract
The invention discloses a liquid compressed air energy storage and peak regulation system and method for steam heat gradient utilization, which comprises a plurality of low-pressure heaters and a plurality of high-pressure heaters; the exhaust steam of a low-pressure cylinder in the coal-fired generator set enters a condenser for heat exchange, passes through a condensate pump, sequentially passes through a plurality of low-pressure heaters, sequentially passes through a deaerator and a water feed pump, sequentially enters a plurality of high-pressure heaters, and then returns to a boiler in the coal-fired generator set; respectively introducing extracted steam of each section of a high-pressure cylinder in the coal-fired generator set into each high-pressure heater; each section of extracted steam of the low-pressure cylinder is respectively introduced into each low-pressure heater; the third stage of extraction steam of the intermediate pressure cylinder is introduced into the last low-pressure heater from the condensate pump to the deaerator, the second stage of extraction steam is introduced into the deaerator, the first stage of extraction steam is introduced into the air heater, and the extraction steam enters the first high-pressure heater from the deaerator to the boiler after heat exchange.
Description
[ technical field ] A method for producing a semiconductor device
The invention belongs to the technical field of liquid compressed air energy storage, relates to a liquid compressed air energy storage and peak shaving system and method, and particularly relates to a coal-fired generator set coupled liquid compressed air energy storage and peak shaving system and method capable of realizing steam heat gradient utilization.
[ background of the invention ]
The energy storage technology is one of effective means for promoting the consumption of renewable energy and ensuring the safe and stable operation of a power grid. At present, the developed energy storage technologies mainly include pumped storage, compressed air storage, electrochemical storage and the like. The compressed air energy storage, especially the liquid compressed air energy storage, has the advantages of large capacity, low cost, flexible arrangement position and the like, and is a large-scale energy storage technology with popularization and application prospects. However, the liquid compressed air energy storage system relates to the gas-liquid conversion of air, the heat and cold transfer process is more, and the overall operation energy efficiency level of the system is lower.
[ summary of the invention ]
The invention aims to solve the problem that the existing liquid compressed air energy storage system is low in overall operation energy efficiency level, and provides a coal-fired generator set coupled liquid compressed air energy storage peak regulation system and method capable of realizing steam heat gradient utilization.
In order to achieve the purpose, the invention adopts the following technical scheme to realize the purpose:
the liquid compressed air energy storage peak regulation system for steam heat gradient utilization comprises a coal-fired power generating set, a plurality of low-pressure heaters, a plurality of high-pressure heaters, and an air compressor, a refrigeration expander, a gas-liquid separation device, an air storage tank, a booster pump, an air heater, an air expander and a second generator which are sequentially connected;
the exhaust steam of a low-pressure cylinder in the coal-fired generator set enters a condenser for heat exchange, passes through a condensate pump, sequentially passes through a plurality of low-pressure heaters, sequentially passes through a deaerator and a water feed pump, sequentially enters a plurality of high-pressure heaters, and then returns to a boiler in the coal-fired generator set;
each section of extracted steam of a high-pressure cylinder in the coal-fired generator set is respectively introduced into each high-pressure heater; each section of extracted steam of the low-pressure cylinder is respectively introduced into each low-pressure heater; introducing third-stage steam extraction of the intermediate pressure cylinder from a condensate pump to a last low-pressure heater of a deaerator, introducing second-stage steam extraction into the deaerator, introducing first-stage steam extraction into an air heater, and introducing the heat-exchanged steam into a first high-pressure heater of a boiler from the deaerator;
after being pressurized by the air compressor, the air enters a refrigeration expander to expand and release heat, the separation of liquid air and gaseous air is completed in a gas-liquid separation device, and the liquid air is stored in an air storage tank to complete air compression and energy storage; when external energy release is used for power generation, liquid air in the air storage tank is pressurized by the booster pump, enters the air heater for heating, then enters the air expansion machine for expansion and work, and drives the second generator to generate power.
The invention further improves the following steps:
the number of the low-pressure heaters is four, and the low-pressure heaters comprise a first low-pressure heater, a second low-pressure heater, a third low-pressure heater and a fourth low-pressure heater;
introducing first-stage steam extraction of a low-pressure cylinder in the coal-fired generator set into a third low-pressure heater, introducing second-stage steam extraction into a second low-pressure heater, and introducing third-stage steam extraction into a first low-pressure heater;
and introducing the third stage of extracted steam of the intermediate pressure cylinder in the coal-fired power generating unit into a fourth low-pressure heater.
The high-pressure heaters are three and comprise a first high-pressure heater, a second high-pressure heater and a third high-pressure heater;
introducing first-stage steam extraction of a high-pressure cylinder in the coal-fired generator set into a third high-pressure heater, and introducing second-stage steam extraction into a second high-pressure heater;
and the first-stage steam extraction of the intermediate pressure cylinder in the coal-fired generator set is introduced into the air heater, and enters the first high-pressure heater after heat exchange.
The coal-fired generator set comprises a boiler, a high-pressure cylinder, an intermediate-pressure cylinder and a low-pressure cylinder which are connected in sequence;
and after entering the high-pressure cylinder to do work, the new steam at the outlet of the boiler returns to the boiler to be heated for the second time, and then sequentially enters the intermediate pressure cylinder and the low-pressure cylinder to do work through expansion, so that the first generator is driven to generate power.
The air compressor is a one-stage air compressor or a multi-stage air compressor.
The air expander is a first-stage air expander or a multi-stage air expander.
A liquid compressed air energy storage peak regulation method for steam heat gradient utilization comprises the following steps:
during energy storage, air is pressurized in an air compressor and then enters a refrigeration expansion machine for expansion and heat release, the separation of liquid air and gaseous air is completed in a gas-liquid separation device, and the liquid air is stored in an air storage tank;
when energy is released for power generation, liquid air at the outlet of the air storage tank is pressurized by the booster pump, enters the air heater for heating, enters the air expander for expansion and work, and drives the second generator to generate power; the first-stage steam extraction of the medium pressure cylinder of the coal-fired power generating set firstly enters the air heater to heat air and then enters the first high-pressure heater from the deaerator to the boiler to heat water.
The method is further improved in that:
and the gaseous air separated in the gas-liquid separation device is led back to the air compressor to be compressed again.
Compared with the prior art, the invention has the following beneficial effects:
the invention relates to a liquid compressed air energy storage and peak regulation system and method for gradient utilization of steam heat. The irreversible loss increase caused by the fact that the extracted steam with higher superheat degree directly enters the water supply heater for heat exchange is avoided. The overall operating efficiency of the system is improved.
[ description of the 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 an embodiment of a liquid compressed air energy storage peaking system for steam heat cascade utilization in accordance with the present invention.
Wherein: the system comprises a boiler 1, a high-pressure cylinder 2, a medium-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 third low-pressure heater 10, a fourth low-pressure heater 11, a deaerator 12, a water feed pump 13, a first high-pressure heater 14, a second high-pressure heater 15, a third high-pressure heater 16, an air compressor 17, a refrigeration expander 18, a gas-liquid separation device 19, an air storage tank 20, a booster pump 21, an air heater 22, an air expander 23 and a second generator 24.
[ detailed description ] embodiments
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 derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope 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 merely to distinguish one description 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 provides a coal-fired power generation unit coupled liquid compressed air energy storage peak shaving system capable of realizing steam heat gradient utilization, which is an optimal scheme and comprises a boiler 1, a high-pressure cylinder 2, a medium-pressure cylinder 3, a low-pressure cylinder 4, a first power generator 5, a condenser 6, a condensate pump 7, a first low-pressure heater 8, a second low-pressure heater 9, a third low-pressure heater 10, a fourth low-pressure heater 11, a deaerator 12, a water feed pump 13, a first high-pressure heater 14, a second high-pressure heater 15, a third high-pressure heater 16, an air compressor 17, a refrigeration expander 18, a gas-liquid separation device 19, an air storage tank 20, a booster pump 21, an air heater 22, an air expander 23 and a second power generator 24.
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. After entering a condenser 6 for condensation, the exhaust steam of the low-pressure cylinder 4 sequentially passes through a condensate pump 7, a first low-pressure heater 8, a second low-pressure heater 9, a third low-pressure heater 10 and a fourth low-pressure heater 11, then passes through a deaerator 12 and a water feed pump 13, enters a first high-pressure heater 14, a second high-pressure heater 15 and a third high-pressure heater 16, and finally returns to the boiler 1 to complete the steam-water circulation of the coal-fired generator set.
When the liquid compressed air energy storage system operates in an energy storage mode, air is pressurized in the air compressor 17 and then enters the refrigeration expander 18 to be expanded and released, liquid air and gaseous air are separated in the gas-liquid separation device 19, the liquid air is stored in the air storage tank 20, the separated gaseous air returns to the inlet of the air compressor 17 to be compressed again, and the air compression and liquefaction energy storage process of the liquid compressed air energy storage system is completed.
When the liquid compressed air energy storage system operates in an energy-releasing and power-generating mode, liquid air at the outlet of the air storage tank 20 is pressurized by the booster pump 21 and then enters the air heater 22 to be heated, and then enters the air expander 23 to be expanded and do work to drive the second generator 24 to generate power, so that the power-generating and energy-releasing process of the liquid compressed air energy storage system is completed.
Three-stage steam extraction of the coal-fired power generating unit is generally the first-stage steam extraction after reheating, the degree of superheat of steam is high, and if the steam directly enters a corresponding feed water heater to heat feed water, the irreversible loss is increased due to large heat exchange temperature difference between the two. The invention provides a coal-fired generator set coupled liquid compressed air energy storage peak regulation system capable of realizing gradient utilization of steam heat. The three-stage steam extraction of the unit firstly enters the air heater 22 to heat the air, so that the air is heated and gasified, and then enters the first high-pressure heater 14 of the unit to heat the water supply. Therefore, reasonable gradient utilization of three-section extraction heat is realized, and the overall operation economy of the system is improved.
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 (8)
1. The liquid compressed air energy storage and peak regulation system for steam heat gradient utilization is characterized by comprising a coal-fired power generating set, a plurality of low-pressure heaters, a plurality of high-pressure heaters, and an air compressor (17), a refrigeration expander (18), a gas-liquid separation device (19), an air storage tank (20), a booster pump (21), an air heater (22), an air expander (23) and a second power generator (24) which are sequentially connected;
the exhaust steam of a low-pressure cylinder (4) in the coal-fired power generating unit enters a condenser (6) for heat exchange, passes through a condensate pump (7), sequentially passes through a plurality of low-pressure heaters, sequentially passes through a deaerator (12) and a water feed pump (13), sequentially enters a plurality of high-pressure heaters, and then returns to a boiler (1) in the coal-fired power generating unit;
each section of extracted steam of a high-pressure cylinder (2) in the coal-fired generator set is respectively introduced into each high-pressure heater; the extracted steam of each section of the low pressure cylinder (4) is respectively introduced into each low pressure heater; introducing third-stage steam extraction of the intermediate pressure cylinder (3) into a last low-pressure heater from a condensate pump (7) to a deaerator (12), introducing second-stage steam extraction into the deaerator, introducing first-stage steam extraction into an air heater (22), and introducing the steam into a first high-pressure heater from the deaerator (12) to the boiler (1) after heat exchange;
after being pressurized by the air compressor (17), the air enters a refrigeration expander (18) to expand and release heat, the separation of liquid air and gaseous air is completed in a gas-liquid separation device (19), and the liquid air is stored in an air storage tank (20) to complete air compression and energy storage; when external energy releasing power generation is carried out, liquid air in an air storage tank (20) is pressurized by a booster pump (21), enters an air heater (22) for heating, then enters an air expander (23) for expansion and work, and drives a second generator (24) to generate power.
2. The liquid compressed air energy storage and peak shaving system for steam heat cascade utilization according to claim 1, wherein the low pressure heaters are provided in four numbers, including a first low pressure heater (8), a second low pressure heater (9), a third low pressure heater (10) and a fourth low pressure heater (11);
introducing first-stage steam extraction of a low-pressure cylinder (4) in the coal-fired generator set into a third low-pressure heater (10), introducing second-stage steam extraction into a second low-pressure heater (9), and introducing third-stage steam extraction into a first low-pressure heater (8);
and the third stage of extraction steam of the intermediate pressure cylinder (3) in the coal-fired power generating unit is introduced into a fourth low-pressure heater (11).
3. The liquid compressed air energy storage and peak shaving system for steam heat cascade utilization according to claim 2, wherein the high pressure heaters are provided in three numbers, including a first high pressure heater (14), a second high pressure heater (15) and a third high pressure heater (16);
the first-stage extraction steam of a high-pressure cylinder (2) in the coal-fired generator set is introduced into a third high-pressure heater (16), and the second-stage extraction steam is introduced into a second high-pressure heater (15);
the first-stage steam extraction of a medium pressure cylinder (3) in the coal-fired generator set is introduced into an air heater (22) and enters a first high-pressure heater (14) after heat exchange.
4. The liquid compressed air energy storage and peak regulation system for steam heat cascade utilization according to any one of claims 1 to 3, characterized in that the coal-fired power generating unit comprises a boiler (1), a high-pressure cylinder (2), an intermediate pressure cylinder (3) and a low pressure cylinder (4) which are connected in sequence;
and after new steam at the outlet of the boiler (1) enters the high-pressure cylinder (2) to do work, the new steam returns to the boiler (1) to be heated for the second time, and then sequentially enters the medium-pressure cylinder (3) and the low-pressure cylinder (4) to do work through expansion, so that the first generator (5) is driven to generate power.
5. The liquid compressed air energy storage peaking system of steam heat cascade utilization of claim 4, wherein the air compressor (17) is a one-stage air compressor or a multi-stage air compressor.
6. The liquid compressed air energy storage peaking system of steam heat cascade utilization of claim 5, wherein the air expander (18) is a one-stage air expander or a multi-stage air expander.
7. A liquid compressed air energy storage peak shaving method using steam heat cascade utilization of the system of any one of claims 1 to 6, characterized by comprising the steps of:
during energy storage, air is pressurized in an air compressor (17) and then enters a refrigeration expander (18) to be expanded and released, liquid air is separated from gaseous air in a gas-liquid separation device (19), and the liquid air is stored in an air storage tank (20);
when energy is released and power is generated, liquid air at the outlet of the air storage tank (20) is pressurized by the booster pump (21), enters the air heater (22) for heating, enters the air expander (23) for expansion and work, and drives the second generator (24) to generate power; the first-stage steam extraction of a medium pressure cylinder (3) of the coal-fired power generating set firstly enters an air heater (22) to heat air and then enters a first high-pressure heater from a deaerator (12) to a boiler (1) to heat water supply.
8. The liquid compressed air energy storage and peak shaving method for steam heat cascade utilization according to claim 7, characterized in that the gaseous air separated in the gas-liquid separation device (19) is led back to the air compressor (17) for recompression.
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| CN202011053200.5A CN112065516A (en) | 2020-09-29 | 2020-09-29 | Liquid compressed air energy storage and peak regulation system and method for steam heat gradient utilization |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113914952A (en) * | 2021-10-15 | 2022-01-11 | 西安热工研究院有限公司 | Power generation peak regulation system of transcritical carbon dioxide energy storage coupling steam turbine and operation method |
| CN114109547A (en) * | 2021-10-15 | 2022-03-01 | 西安热工研究院有限公司 | Coal-fired power plant peak regulation system based on supercritical carbon dioxide energy storage and operation method |
| CN114776393A (en) * | 2022-04-15 | 2022-07-22 | 上海发电设备成套设计研究院有限责任公司 | Air energy storage power generation system and method coupled with thermal power |
| CN114909196A (en) * | 2022-04-28 | 2022-08-16 | 西安热工研究院有限公司 | Pumped compression isobaric release air energy storage system and method |
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2020
- 2020-09-29 CN CN202011053200.5A patent/CN112065516A/en active Pending
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| CN113914952A (en) * | 2021-10-15 | 2022-01-11 | 西安热工研究院有限公司 | Power generation peak regulation system of transcritical carbon dioxide energy storage coupling steam turbine and operation method |
| CN114109547A (en) * | 2021-10-15 | 2022-03-01 | 西安热工研究院有限公司 | Coal-fired power plant peak regulation system based on supercritical carbon dioxide energy storage and operation method |
| CN113914952B (en) * | 2021-10-15 | 2024-01-23 | 西安热工研究院有限公司 | Transcritical carbon dioxide energy storage coupling steam turbine power generation peak regulation system and operation method |
| CN114776393A (en) * | 2022-04-15 | 2022-07-22 | 上海发电设备成套设计研究院有限责任公司 | Air energy storage power generation system and method coupled with thermal power |
| CN114909196A (en) * | 2022-04-28 | 2022-08-16 | 西安热工研究院有限公司 | Pumped compression isobaric release air energy storage system and method |
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