CN212406826U - Liquid compressed air energy storage system coupled with coal-fired generator set thermodynamic system - Google Patents
Liquid compressed air energy storage system coupled with coal-fired generator set thermodynamic system Download PDFInfo
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- CN212406826U CN212406826U CN202022197998.2U CN202022197998U CN212406826U CN 212406826 U CN212406826 U CN 212406826U CN 202022197998 U CN202022197998 U CN 202022197998U CN 212406826 U CN212406826 U CN 212406826U
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Abstract
The utility model belongs to a liquid compressed air energy storage system, in solving current liquid compressed air energy storage system, to two kinds of main schemes that the compression of air in compression energy storage and power generation process is exothermic, the inflation heat absorption is handled, or there is the initial investment big, the variable working condition performance is poor, or there are the problem that fuel consumption is high and pollutant discharge is big, provide a liquid compressed air energy storage system with coal-fired generating set thermodynamic system coupling, including air compressor, air cooler, refrigeration expander, vapour and liquid separator, liquefied air storage device, liquid booster pump and a plurality of air heater that communicate in proper order; wherein the heating temperatures of the plurality of air heaters are sequentially increased; the air heaters are respectively communicated with a plurality of steam source points of a steam turbine in the coal-fired power generating set, and the pressure and the temperature of each steam source point are different.
Description
[ technical field ] A method for producing a semiconductor device
The utility model belongs to liquid compressed air energy storage system, especially a liquid compressed air energy storage system with coal-fired generating set thermodynamic system coupling.
[ background of the invention ]
By 2019, the cumulative installed capacities of photovoltaic power and wind power respectively reach 2.05 hundred million kilowatts and 2.1 hundred million kilowatts, and account for 10.2 percent and 10.4 percent of the total installed capacity (20.1 hundred million kilowatts); the annual total power generation amount reaches 2243 and 4057 hundred million kilowatts respectively, which account for 3 percent and 5.5 percent of the annual total power generation amount (73253 hundred million kilowatts), and the power generation amount ratio is obviously smaller than the installed capacity ratio, which indicates that the new energy power still has larger waste condition. New energy power is rapidly developed in the future, and therefore thermal power generating units are required to further excavate peak shaving potential on the basis of the current situation.
The renewable energy source electric energy with the characteristics of volatility and intermittence is connected to the power grid on a large scale, and higher requirements are provided for peak clipping, valley filling, safety and stability of the 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 energy storage technology mainly comprises pumped storage, compressed air storage and electrochemical storage. The pumped storage technology is mature, the efficiency is high, but the problems of geographical position limitation and the like exist, and the large-scale popularization is difficult; the electrochemical energy storage technology has the advantages of fast response, small volume and short construction period, but has the defects of short overall service life, large industrial pollution and the like; the liquid 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.
However, the currently published and reported liquid compressed air energy storage systems mainly have two treatment schemes of compression heat release and expansion heat absorption for air in the processes of compression energy storage and power generation: 1) a heat storage system is arranged to store released heat in the air compression process and raise the temperature before the expansion energy-releasing power generation link is used for an expander; 2) the compression heat is discharged outside, and the expansion heat is supplied by a fuel afterburning mode. The heat storage scheme has the defects of large initial investment, poor performance under variable working conditions and the like; the heat supplementing scheme has the problems of fuel consumption, pollutant emission and the like.
[ Utility model ] content
The utility model aims to solve present liquid compressed air energy storage system, to two kinds of main schemes that the air is exothermic, the inflation heat absorption of compression energy storage and power generation process handles, or have the initial investment big, become the operating mode performance poor, or have the problem that fuel consumption height and pollutant discharge are big, provide a liquid compressed air energy storage system with the coupling of coal-fired generating set thermodynamic system.
In order to achieve the above purpose, the utility model adopts the following technical scheme to realize:
a liquid compressed air energy storage system coupled with a coal-fired generating set thermodynamic system comprises an air compressor, an air cooler, a refrigeration expander, a gas-liquid separator, a liquefied air storage device, a liquid booster pump and a plurality of air heaters which are sequentially communicated; wherein the heating temperatures of the plurality of air heaters are sequentially increased;
after being pressurized by an air compressor, air is cooled by an air cooler and then enters a refrigeration expander, gas-liquid separation is completed in a gas-liquid separator, a liquid part enters a liquefied air storage device, is boosted by a liquid booster pump, is sequentially heated by a plurality of air heaters and then enters an air expansion generator to do work and generate power;
the air heaters are respectively communicated with a plurality of steam source points of a steam turbine in the coal-fired power generating set, and the pressure and the temperature of each steam source point are different.
The utility model discloses further improvement lies in:
the air preheater, the warm air blower and the boiler blower are sequentially communicated;
the air preheater is communicated with a boiler of the coal-fired generator set;
and a circulating water pipeline is arranged between the fan heater and the air cooler, and a circulating water booster pump is arranged on the circulating water pipeline.
The new steam at the boiler outlet in the coal-fired generator set returns to a reheater in the boiler after being acted by the high-pressure cylinder of the steam turbine, and then sequentially enters the intermediate-pressure cylinder of the steam turbine and the low-pressure cylinder of the steam turbine to act so as to drive the generator to generate power.
The air heater comprises a primary air heater, a secondary air heater, a tertiary air heater and a quaternary air heater which are sequentially arranged from the liquid booster pump to the air expansion generator;
the heat source of the four-stage air heater extracts new steam from the outlet of a boiler reheater in the coal-fired generator set;
a heat source of the three-level air heater extracts steam extracted from a certain level of a medium pressure cylinder of a steam turbine of the spontaneous combustion coal generating set;
the heat source of the secondary air heater extracts the steam exhausted by the medium pressure cylinder of the steam turbine of the spontaneous combustion coal generating set;
and a heat source of the primary air heater extracts certain stage of extracted steam from a low-pressure cylinder of a steam turbine of the self-fired coal generating set.
And the drained water after the steam of the first-stage air heater, the second-stage air heater, the third-stage air heater and the fourth-stage air heater releases heat and condenses flows back to a condenser of the coal-fired generator set.
Compared with the prior art, the utility model discloses following beneficial effect has:
1. the utility model discloses with the liquid compressed air energy storage system of coal-fired generating set thermodynamic system coupling, required heating heat source in heat and the energy release electricity generation link that the air compression produced in the liquid compressed air energy storage link, all carry out high-efficient coupling with the heat source that coal-fired generating set thermodynamic cycle process quality is close. Compared with the existing liquid compressed air energy storage system, the system cancels a heat storage system or a fuel heat compensation link, replaces a gas-water heat exchanger and a steam-gas heat exchanger, and exchanges heat with a heat user with the quality similar to that of a coal-fired generator set in the processes of compression energy storage and power generation through compression heat release and expansion heat absorption of air, so that the system investment is reduced, and the overall efficiency can be effectively improved.
2. The utility model discloses flow the circulation between air gas cooler and the air heater, with the cold wind of the air heat transfer for the export of boiler forced draught blower of air compressor export, improve air heater entry wind-warm syndrome, improve air heater operational environment, can improve equipment fail safe nature to promote boiler efficiency.
3. The utility model discloses well air heater is level four altogether, and the heat source comes from the different vapour source points of steam turbine, and system compact structure and overall utilization rate are high.
4. The utility model discloses the hydrophobic homogeneous reflux to coal-fired generating set condenser after the exothermic condensation of heater steam at different levels has guaranteed overall system's soda mass balance.
[ description of the drawings ]
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are required 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 compressed air energy storage system coupled to a thermodynamic system of a coal-fired power generation unit.
Wherein: 1-a boiler; 2-high pressure cylinder of steam turbine; 3-a steam turbine intermediate pressure cylinder; 4-low pressure cylinder of steam turbine; 5-a generator; 6-air preheater; 7-a warm air device; 8-boiler blower; 9-closed water booster pump; 10-an air compressor; 11-an air cooler; 12-a refrigeration expander; 13-a gas-liquid separator; 14-a liquefied air storage device; 15-liquid booster pump; 16-primary air heater; 17-a secondary air heater; 18-a tertiary air heater; 19-a four stage air heater; 20-air expansion generator.
[ detailed description ] embodiments
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the embodiments of the present invention will be clearly and completely described below with reference to the accompanying 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, as 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 accompanying drawings, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to 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. indicate the orientation or position relationship based on the orientation or position relationship shown in the drawings, or the orientation or position relationship that the product of the present invention is usually placed when in use, the description is only for convenience of description and simplification, but the indication or suggestion that the device or element to be referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be interpreted 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 explicitly stated or limited otherwise, 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 meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.
The present invention will be described in further detail with reference to the accompanying drawings:
referring to fig. 1, the utility model provides a with liquid compressed air energy storage system of coal-fired generating set thermodynamic system coupling, this huge heat carrier of make full use of coal-fired generating set soda thermodynamic cycle sets up air water heat exchanger, gas steam heat exchanger and corresponding pipeline to closed circulating water is the heat carrier, is used for heating 6 entry cold winds of air heater 1 with the heat release of air compression energy storage process, improves 6 operational environment of air heater, with improve equipment fail safe nature, and promote boiler 1 efficiency. At the same time, the temperature of the air entering the air expansion generator 20 is increased in each stage of the air heater with different quality steam.
The liquid compressed air energy storage system coupled with the thermodynamic system of the coal-fired generator set comprises an air preheater 6, a fan heater 7 and a boiler blower 8 which are sequentially communicated; an air compressor 10, an air cooler 11, a refrigeration expander 12, a gas-liquid separator 13, a liquefied air storage device 14, a liquid booster pump 15, and a plurality of air heaters are connected in this order. The plurality of air heaters include a primary air heater 16, a secondary air heater 17, a tertiary air heater 18, and a quaternary air heater 19, which are sequentially arranged from the liquid booster pump 15 to the air expansion generator 20.
In the coal-fired generator set, new steam at the outlet of a boiler 1 does work through a high-pressure steam turbine cylinder 2, returns to a reheater of the boiler 1 for secondary temperature rise, and then enters a medium-pressure steam turbine cylinder 3 and a low-pressure steam turbine cylinder 4 to do work to drive a generator 5 to generate power. The steam turbine is provided with regenerative steam extraction with different pressure and temperature grades.
In the liquid compressed air energy storage link, after being pressurized by the compressor 10, the air releases heat in the air cooler 11, then enters the refrigeration expander 12 to realize deep cooling, liquid and gaseous separation of the air is realized in the gas-liquid separator 13, and then the liquid enters the liquefied air storage device 14, which is the liquefied compressed air energy storage process of the air.
The power generation and energy release process of the energy storage system is that liquid air at the outlet of the liquefied air storage device 14 is pressurized by a liquid booster pump 15, and then is subjected to gradient temperature rise by a primary air heater 16, a secondary air heater 17, a tertiary air heater 18 and a quaternary air heater 19 in sequence, and then enters an air expansion generator 20 to apply work for power generation, and exhaust gas is discharged into the atmospheric environment.
In addition, in the air compression energy storage flow, air cooler 11 and air heater 7 of boiler 1 are set up, its structural style is air-water surface formula heat transfer, use closed circulating water as the heat carrier, under the drive of closed water booster pump 9, flow circulation carries out between air cooler 11 and air heater 7, give the cold wind of 8 exports of boiler forced draught blower with the air heat transfer in air compressor 10 export, improve the air temperature of 6 entrys of air preheater, improve the operational environment of air preheater 6 in order to improve equipment fail safe nature, and promote boiler 1 efficiency.
In the air expansion power generation energy release process, four air heaters are all steam-air heat exchangers, and four kinds of steam with different pressures and temperatures are extracted from different steam source points of a steam turbine respectively: the steam extracted by the four-stage air heater 19, the three-stage air heater 18, the two-stage air heater 17 and the one-stage air heater 16 is reheat steam, three-stage steam extraction (a certain stage of a steam turbine intermediate pressure cylinder 3), intermediate exhaust steam extraction (steam extraction of the steam turbine intermediate pressure cylinder 3) and six-stage steam extraction (a certain stage of a steam turbine low pressure cylinder 4) respectively, wherein the reheat steam is new steam at the outlet of a reheater of the boiler 1, has the highest temperature and is used as a heating steam source of the last-stage air heater; the three-stage extraction steam is one stage of extraction steam of the intermediate pressure cylinder 3 of the steam turbine, the temperature of the extraction steam is lower than that of the reheated steam, but the extraction steam is higher than that of the intermediate exhaust extraction steam and the extraction steam of the six stages, and the extraction steam is used as a heating steam source of the three-stage air heater 18; the middle exhaust steam extraction and the six-section steam extraction are respectively used as heating steam sources of a secondary air heater 17 and a primary air heater 16. The low-temperature air at the outlet of the liquid booster pump 15 flows through the first-stage air heater 16, the second-stage air heater 17, the third-stage air heater 18 and the fourth-stage air heater 19 in sequence, is heated in a gradient manner, and then enters the air expander 20 to do work and generate power. And the drained water after the heat release and condensation of the steam of the total four-stage air heater flows back to a condenser of the coal-fired power generating set, so that the steam-water quality balance of the whole system is ensured.
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 (5)
1. A liquid compressed air energy storage system coupled with a coal-fired power generating set thermodynamic system is characterized by comprising an air compressor (10), an air cooler (11), a refrigeration expander (12), a gas-liquid separator (13), a liquefied air storage device (14), a liquid booster pump (15) and a plurality of air heaters which are sequentially communicated; wherein the heating temperatures of the plurality of air heaters are sequentially increased;
after being pressurized by an air compressor (10), air is cooled by an air cooler (11), then enters a refrigeration expander (12), gas-liquid separation is completed in a gas-liquid separator (13), a liquid part enters a liquefied air storage device (14), is boosted by a liquid booster pump (15), is heated by a plurality of air heaters in sequence, and then enters an air expansion generator (20) to do work and generate power;
the air heaters are respectively communicated with a plurality of steam source points of a steam turbine in the coal-fired power generating set, and the pressure and the temperature of each steam source point are different.
2. The system of claim 1, further comprising an air preheater (6), a fan heater (7) and a boiler blower (8) in communication in sequence;
the air preheater (6) is communicated with a boiler of the coal-fired power generating set;
and a circulating water pipeline is arranged between the warm air blower (7) and the air cooler (11), and a circulating water booster pump (9) is arranged on the circulating water pipeline.
3. The liquid compressed air energy storage system coupled with the thermodynamic system of the coal-fired power generating unit according to claim 1 or 2, wherein new steam at the outlet of the boiler (1) in the coal-fired power generating unit returns to a reheater in the boiler (1) after acting through the high-pressure cylinder (2) of the steam turbine, and then sequentially enters the medium-pressure cylinder (3) of the steam turbine and the low-pressure cylinder (4) of the steam turbine to act to drive the power generator (5) to generate power.
4. A liquid compressed air energy storage system coupled to a coal-fired power generation unit thermodynamic system according to claim 3 wherein the air heater comprises a primary air heater (16), a secondary air heater (17), a tertiary air heater (18) and a quaternary air heater (19) in sequence from the liquid booster pump (15) to the air expansion generator (20);
the heat source of the four-stage air heater (19) extracts new steam from the outlet of a boiler reheater in the coal-fired generator set;
a heat source of the three-level air heater (18) extracts steam extracted from a certain level of a medium pressure cylinder of a steam turbine of the coal-fired generator set;
the heat source of the secondary air heater (17) extracts steam exhausted by a medium pressure cylinder of a steam turbine of the self-fired coal generating set;
and a heat source of the primary air heater (16) extracts steam from a certain stage of a low-pressure cylinder of a steam turbine of the coal-fired power generating unit.
5. The liquid compressed air energy storage system coupled with the thermal system of the coal-fired power generating unit is characterized in that the drained water generated after the steam of the primary air heater (16), the secondary air heater (17), the tertiary air heater (18) and the quaternary air heater (19) is subjected to exothermic condensation flows back to the condenser of the coal-fired power generating unit.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113202587A (en) * | 2021-06-09 | 2021-08-03 | 中国科学院理化技术研究所 | Compressed air and liquid air combined energy storage power generation system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113202587A (en) * | 2021-06-09 | 2021-08-03 | 中国科学院理化技术研究所 | Compressed air and liquid air combined energy storage power generation system |
| CN113202587B (en) * | 2021-06-09 | 2022-02-01 | 中国科学院理化技术研究所 | Compressed air and liquid air combined energy storage power generation system |
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