CN214836566U - Liquid compressed air energy storage system coupled with photo-thermal power generation - Google Patents
Liquid compressed air energy storage system coupled with photo-thermal power generation Download PDFInfo
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- CN214836566U CN214836566U CN202120728827.XU CN202120728827U CN214836566U CN 214836566 U CN214836566 U CN 214836566U CN 202120728827 U CN202120728827 U CN 202120728827U CN 214836566 U CN214836566 U CN 214836566U
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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
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/40—Solar thermal energy, e.g. solar towers
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Abstract
The utility model discloses a with liquid compressed air energy storage system of light and heat power generation coupling, including the light and heat power generation system, air compression energy storage system and air inflation release energy system: the photo-thermal power generation system is used for converting sunlight into heat energy, and a part of the heat energy enters the steam generator to heat the steam turbine set to supply water and drive the steam turbine set to drive the first generator to generate power; and the other part of the heat energy is used as a heat source and is conveyed to an air expansion energy release system. The utility model discloses a coupling of light and heat power generation system and liquid compressed air energy storage system is used for heating the turbine unit condensate water of light and heat power generation system with the air compression heat of compressed air energy storage process, squeezes original low pressure heater group steam extraction. When the compressed air energy storage system releases energy to generate electricity, the inlet air of the air expander is heated by high-temperature molten salt of the photo-thermal power generation system.
Description
Technical Field
The utility model belongs to the technical field of the light and heat electricity generation, a liquid compressed air energy storage system with light and heat electricity generation coupling is related to.
Background
With the large-scale grid-connected power generation of renewable energy sources, higher requirements are put forward on the safety and stability of a power system. The construction of a large-scale energy storage device is one of effective means for stabilizing the power generation fluctuation of renewable energy sources and improving the operation reliability of a power system. At present, the developed energy storage technologies mainly include pumped storage, compressed air storage, electrochemical storage, and the like. The pumped storage has high efficiency, but the geographical condition is strict; 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.
A large amount of compression heat can be generated in the air compression process of the liquid compressed air energy storage system, and meanwhile, a heat source is needed to supply the inlet air heating requirement of the air expander in the energy release process. Therefore, conventional liquid compressed air energy storage systems are typically configured with heat storage devices, resulting in increased system investment and increased footprint.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to solve the problem among the prior art, provide a with liquid compressed air energy storage system of light and heat electricity generation coupling.
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 photo-thermal power generation, comprising:
the solar-thermal power generation system is used for converting sunlight into heat energy, and a part of the heat energy enters the steam generator to heat the steam turbine set to supply water and drive the steam turbine set to drive the first generator to generate power; the other part of the heat energy is taken as a heat source and is conveyed to an air expansion energy release system; the method comprises the following steps that (1) condensed water is generated after exhaust steam of a steam turbine unit is subjected to heat exchange through a condenser, one part of the condensed water is conveyed to an air compression energy storage system to absorb air compression heat, and the other part of the condensed water is heated through a heater group and then returns to a steam generator;
the air compression energy storage system comprises an air compressor unit, an interstage heat exchange cold source of the air compressor unit is part of condensed water from a turbine unit, and air is stored in a liquid compressed air storage tank after passing through the air compressor unit;
the air expansion energy release system comprises an air expansion unit, a heat source of the air expansion unit is part of heat energy generated by the photo-thermal power generation system, liquid compressed air in the liquid compressed air storage tank enters the air expansion unit, and the air expansion unit drives the second generator to generate power.
The utility model discloses further improvement lies in:
the solar-thermal power generation system comprises a heat absorption tower, a plurality of heliostats are arranged around the heat absorption tower, a heat absorber is arranged at the top of the heat absorption tower, the heliostats can track sunlight in real time, the sunlight is gathered to the heat absorber and used for providing a heat source for a hot salt storage tank, one part of high-temperature molten salt in the hot salt storage tank enters a steam generator under the drive of a hot salt pump at an outlet, and the other part of high-temperature molten salt is used as a heat source of an air expansion unit; the high-temperature molten salt exchanges heat with the feed water of the steam turbine unit in the steam generator, the low-temperature molten salt after heat exchange enters the cold salt storage tank, and the low-temperature molten salt in the cold salt storage tank enters the heat absorber under the driving of the cold salt pump at the outlet.
The heater group comprises a low-pressure heater group and a high-pressure heater group; the condensed water after heat exchange of the air compressor unit and the condensed water after heating of the low-pressure heater unit are converged and then enter the high-pressure heater unit through the water feeding pump.
The air compression energy storage system further comprises a cryogenic liquefying device, an inlet of the cryogenic liquefying device is connected with an outlet of the air compressor unit, an outlet of the cryogenic liquefying device is connected with a gas-liquid separator, and a liquid outlet of the gas-liquid separator is connected with the liquid compressed air storage tank.
The air compressor unit comprises a plurality of air compressors and a plurality of air coolers, wherein an air inlet of the first air compressor is communicated with the atmosphere, an outlet of the first air compressor is connected with the first air cooler, an outlet of the first air cooler is connected with an inlet of the second air compressor, an outlet of the second air compressor is connected with an inlet of the second air cooler, the rest is done in a similar manner, an outlet of the Nth air compressor is connected with an inlet of the Nth air cooler, and an outlet of the Nth air cooler is connected with an inlet of the cryogenic liquefying device; the cold sources of the first air cooler to the Nth air cooler are all from condensed water of the photo-thermal power generation system.
The air expansion energy-releasing system also comprises an air evaporator, wherein the inlet of the air evaporator is connected with the cryogenic pump, and the outlet of the air evaporator is connected with an air expansion unit; a circulating air passage is arranged between the air evaporator and the cryogenic liquefying device, circulating air exchanges heat with liquid air in the air evaporator, and enters the cryogenic liquefying device after heat exchange to provide cold for the cryogenic liquefying device.
The air expansion unit comprises a plurality of air expansion machines and a plurality of air heaters, wherein an inlet of each first air heater is connected with an outlet of the air evaporator, an outlet of each first air heater is connected with a first air expansion machine, an outlet of each first air expansion machine is connected with an inlet of the corresponding second air heater, an outlet of each second air heater is connected with an inlet of the corresponding second air expansion machine, the rest is done in the same way, an outlet of the Nth air heater is connected with an inlet of the Nth air expansion machine, an outlet of the Nth air expansion machine is communicated with the atmosphere, and the first air expansion machine to the Nth air expansion machine drive the second power generator to generate power together.
The outlet of the condenser is connected with a condensate pump, the outlet of the condensate pump is divided into two paths, one path is connected with a low-pressure heater group through a first valve, and the outlet of the low-pressure heater group is connected with a second valve; the other path of the outlet of the condensate pump is connected with a third valve, and the condensate after heat exchange of the air compressor unit is converged with the condensate at the outlet of the second valve through a fourth valve;
and high-temperature molten salt at the outlet of the hot salt pump is connected with the air expansion unit through a fifth valve, and enters the cold salt storage tank through a sixth valve after heat exchange.
Compared with the prior art, the utility model discloses following beneficial effect has:
the utility model discloses with the liquid compressed air energy storage system of light and heat power generation coupling, through the coupling of light and heat power generation system and liquid compressed air energy storage system, utilize light and heat power generation system low temperature condensate water and high temperature fused salt respectively, realize the absorption of the hot and heat of expander entry air of liquid compressed air energy storage system air compression. The utility model discloses be used for the air compression heat of compressed air energy storage process to heat the turbine unit condensate water of light and heat power generation system, squeeze original low pressure heater group and take out vapour. When the compressed air energy storage system releases energy to generate electricity, the inlet air of the air expander is heated by high-temperature molten salt of the photo-thermal power generation system. Compared with the conventional liquid compressed air energy storage system, the configuration of a heat storage device of the conventional liquid compressed air energy storage system is avoided, and the system construction investment is reduced.
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 the thermodynamic system of the present invention.
Wherein, 1-heliostat, 2-heat absorption tower, 3-heat absorber, 4-cold salt storage tank, 5-hot salt storage tank, 6-steam generator, 7-cold salt pump, 8-hot salt pump, 9-turboset, 10-condenser, 11-condensate pump, 12-low pressure heater group, 13-water feed pump, 14-high pressure heater group, 15-first generator, 16-first air compressor, 17-first air cooler, 18-second air compressor, 19-second air cooler, 20-third air compressor, 21-third air cooler, 22-cryogenic liquefying device, 23-gas-liquid separator, 24-liquid compressed air storage tank, 25-cryogenic pump, 26-air evaporator, 27-first air heater, 28-first air expander, 29-second air heater, 30-second air expander, 31-third air heater, 32-air expander 3, 33-second generator, 34-first valve, 35-second valve, 36-third valve, 37-fourth valve, 38-fifth valve, 39-sixth valve.
Detailed Description
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 the figure, a liquid compressed air energy storage system coupled with photo-thermal power generation is composed of a 1-heliostat, a 2-heat absorption tower, a 3-heat absorber, a 4-cold salt storage tank, a 5-hot salt storage tank, a 6-steam generator, a 7-cold salt pump, an 8-hot salt pump, a 9-turboset, a 10-condenser, an 11-condensate pump, a 12-low-pressure heater group, a 13-water feed pump, a 14-high-pressure heater group, a 15-first generator, a 16-first air compressor, a 17-first air cooler, an 18-second air compressor, a 19-second air cooler, a 20-third air compressor, a 21-third air cooler, a 22-cryogenic liquefaction device, a 23-gas-liquid separator and a 24-liquid compressed air storage tank, 25-cryogenic pump, 26-air evaporator, 27-first air heater, 28-first air expander, 29-second air heater, 30-second air expander, 31-third air heater, 32-air expander 3, 33-second generator, 34-first valve, 35-second valve, 36-third valve, 37-fourth valve, 38-fifth valve, 39-sixth valve.
The heat absorber 3 is installed on the heat absorption tower 2, a certain number of heliostats 1 are arranged around the heat absorption tower 2, the heliostats 1 are controlled by a computer, sunlight can be tracked in real time, and the sunlight is gathered to the heat absorber 3 on the top of the heat absorption tower 2. The low-temperature molten salt in the cold salt storage tank 4 is driven by a cold salt pump 7 to enter the heat absorption tower 2, the temperature of the low-temperature molten salt is increased by solar heating in the heat absorber 3, and then the low-temperature molten salt enters the hot salt storage tank 5. The high-temperature molten salt in the hot salt storage tank 5 enters the steam generator 6 under the drive of the outlet hot salt pump 8 to exchange heat with the feed water of the steam turbine set, and the low-temperature molten salt returns to the cold salt storage tank 4 again.
The feed water of the steam turbine set is heated and evaporated into high-temperature steam in the steam generator 6 through high-temperature molten salt, and then enters the steam turbine set 9 to expand and do work to drive the first generator 15 to generate electricity. The exhaust steam of the turbine unit 9 enters a condenser 10 for condensation, then enters a low-pressure heater group 12 after being boosted by a condensate pump 11, and then returns to the steam generator 6 after sequentially passing through a feed pump 13 and a high-pressure heater group 14.
The air is pressurized step by air compressors at all stages to become high-pressure air, and air coolers are arranged at the outlets of the compressors at all stages. Then the air enters a cryogenic liquefying device 22 to be cooled into low-temperature gas-liquid mixed air, liquid air and gaseous air are separated in a gas-liquid separator 23, the liquid air is stored in a liquid compressed air storage tank 24, and the energy storage process of the liquid compressed air is completed.
When the liquid compressed air energy storage system releases energy to the outside for power generation, liquid air at the outlet of the liquid compressed air storage tank 24 is boosted by the cryogenic pump 25, enters the air evaporator 26 to absorb heat and evaporate into gaseous air, and then is heated by the air heaters in sequence and enters the air expanders at all stages to do work to drive the second generator 33 to generate power.
The utility model provides a pair of with liquid compressed air energy storage system of light and heat electricity generation coupling, with light and heat electricity generation system and liquid compressed air energy storage system looks coupling, main innovation point as follows:
when the liquid compressed air energy storage system operates in an energy storage mode, the first valve 34 and the second valve 35 are closed, the third valve 36 and the fourth valve 37 are opened, condensed water at the outlet of the condenser 10 enters each air cooler to cool air at the outlet of each stage of compressor, and the condensed water returns to the inlet of the water feeding pump 13 after being heated. When the air compression energy storage process is finished, the first valve 34 and the second valve 35 are opened, the third valve 36 and the fourth valve 37 are closed, and condensed water at the outlet of the condensed water pump enters the inlet of the feed water pump after being heated by the low-pressure heater group.
When the energy release mode of the liquid compressed air energy storage system operates, the fifth valve 38 and the sixth valve 39 are opened, one path of high-temperature molten salt is led from the outlet of the heat salt pump 8 to enter each air heater of the liquid compressed air energy storage system, air at the inlet of each air expander is heated, and the low-temperature molten salt after heat release returns to the cold salt storage tank 4. When the energy releasing and power generating mode of the compressed air energy storage system is finished, the fifth valve 38 and the sixth valve 39 are closed, and all high-temperature molten salt at the outlet of the hot salt pump enters the steam generator.
A circulating air passage is arranged between the cryogenic liquefaction device 22 and the air evaporator 26, and circulating air is cooled into low-temperature air through liquid air in the air evaporator 26 and then enters the cryogenic liquefaction device 22 to provide cold energy for the air cryogenic liquefaction process.
The utility model discloses air compressor is not restricted to tertiary (reducible or increase), air compressor and air cooler quantity one-to-one. The air expanders are not limited to three stages (may be reduced or increased), and the number of the air expanders corresponds to the number of the air heaters.
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. A liquid compressed air energy storage system coupled with photo-thermal power generation, comprising:
the solar-thermal power generation system is used for converting sunlight into heat energy, one part of the heat energy enters the steam generator (6) to heat the steam turbine set (9) to supply water, and the steam turbine set (9) is driven to drive the first generator (15) to generate power; the other part of the heat energy is taken as a heat source and is conveyed to an air expansion energy release system; the method comprises the following steps that (1) condensed water is generated after exhaust steam of a steam turbine set (9) exchanges heat through a condenser (10), one part of the condensed water is conveyed to an air compression energy storage system to absorb air compression heat, and the other part of the condensed water is heated through a heater set and then returns to a steam generator (6);
the air compression energy storage system comprises an air compressor unit, an interstage heat exchange cold source of the air compressor unit is part of condensed water from a steam turbine unit (9), and air is stored in a liquid compressed air storage tank (24) after passing through the air compressor unit;
the air expansion energy release system comprises an air expansion unit, a heat source of the air expansion unit is part of heat energy generated by the photo-thermal power generation system, liquid compressed air in the liquid compressed air storage tank (24) enters the air expansion unit, and the air expansion unit drives the second generator (33) to generate power.
2. The liquid compressed air energy storage system coupled with photo-thermal power generation according to claim 1, wherein the photo-thermal power generation system comprises a heat absorption tower (2), a plurality of heliostats (1) are arranged around the heat absorption tower (2), a heat absorber (3) is arranged at the top of the heat absorption tower (2), the heliostats (1) can track sunlight in real time, the sunlight is concentrated on the heat absorber (3) and used for providing a heat source for a hot salt storage tank (5), a part of high-temperature molten salt in the hot salt storage tank (5) enters a steam generator (6) under the driving of a hot salt pump (8) at an outlet, and the other part of high-temperature molten salt is used as a heat source of an air expansion unit; the high-temperature molten salt exchanges heat with the feed water of the steam turbine set (9) in the steam generator (6), the low-temperature molten salt after heat exchange enters the cold salt storage tank (4), and the low-temperature molten salt in the cold salt storage tank (4) enters the heat absorber (3) under the driving of the cold salt pump (7) at the outlet.
3. A liquid compressed air energy storage system coupled with photothermal power generation according to claim 1 or 2, wherein the heater bank comprises a low pressure heater bank (12) and a high pressure heater bank (14); the condensed water after heat exchange of the air compressor set and the condensed water after heating of the low-pressure heater set (12) are converged and then enter the high-pressure heater set (14) through the water feeding pump (13).
4. The liquid compressed air energy storage system coupled with photo-thermal power generation according to claim 1, wherein the air compression energy storage system further comprises a cryogenic liquefying device (22), an inlet of the cryogenic liquefying device (22) is connected with an outlet of the air compressor unit, an outlet of the cryogenic liquefying device (22) is connected with a gas-liquid separator (23), and a liquid outlet of the gas-liquid separator (23) is connected with a liquid compressed air storage tank (24).
5. The liquid compressed air energy storage system coupled with photo-thermal power generation according to claim 4, wherein the air compressor set comprises a plurality of air compressors and a plurality of air coolers, an air inlet of the first air compressor (16) is communicated with the atmosphere, an outlet of the first air compressor is connected with the first air cooler (17), an outlet of the first air cooler (17) is connected with an inlet of the second air compressor (18), an outlet of the second air compressor (18) is connected with an inlet of the second air cooler (19), and so on, an outlet of the Nth air compressor is connected with an inlet of the Nth air cooler, and an outlet of the Nth air cooler is connected with an inlet of the cryogenic liquefying device (22); the cold sources of the first air cooler (17) to the Nth air cooler are all from condensed water of the photo-thermal power generation system.
6. The liquid compressed air energy storage system coupled with photo-thermal power generation according to claim 4 or 5, wherein the air expansion energy release system further comprises an air evaporator (26), the inlet of the air evaporator (26) is connected with the cryogenic pump (25), and the outlet of the air evaporator is connected with the air expansion unit; a circulating air passage is arranged between the air evaporator (26) and the cryogenic liquefying device (22), circulating air exchanges heat with liquid air in the air evaporator (26), enters the cryogenic liquefying device (22) after heat exchange, and provides cold for the cryogenic liquefying device (22).
7. The liquid compressed air energy storage system coupled with photo-thermal power generation is characterized in that the air expansion unit comprises a plurality of air expansion machines and a plurality of air heaters, the inlet of the first air heater (27) is connected with the outlet of the air evaporator (26), the outlet of the first air heater is connected with the first air expansion machine (28), the outlet of the first air expansion machine (28) is connected with the inlet of the second air heater (29), the outlet of the second air heater (29) is connected with the inlet of the second air expansion machine (30), and the like, the outlet of the Nth air heater is connected with the inlet of the Nth air expansion machine, the outlet of the Nth air expansion machine is communicated with the atmosphere, and the first air expansion machine (28) to the Nth air expansion machine jointly drive the second generator (33) to generate power.
8. The liquid compressed air energy storage system coupled with photo-thermal power generation as claimed in claim 7, wherein an outlet of the condenser (10) is connected with a condensate pump (11), an outlet of the condensate pump (11) is divided into two paths, one path is connected with the low-pressure heater group (12) through a first valve (34), and an outlet of the low-pressure heater group (12) is connected with a second valve (35); the other path of the outlet of the condensate pump (11) is connected with a third valve (36), and the condensate after heat exchange of the air compressor unit is converged with the condensate at the outlet of the second valve (35) through a fourth valve (37);
high-temperature molten salt at the outlet of the hot salt pump (8) is connected with the air expansion unit through a fifth valve (38), and enters the cold salt storage tank (4) through a sixth valve (39) after heat exchange.
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