CN219344900U - Novel high-efficient compressed air energy storage system - Google Patents
Novel high-efficient compressed air energy storage system Download PDFInfo
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- CN219344900U CN219344900U CN202320287460.1U CN202320287460U CN219344900U CN 219344900 U CN219344900 U CN 219344900U CN 202320287460 U CN202320287460 U CN 202320287460U CN 219344900 U CN219344900 U CN 219344900U
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Abstract
The utility model provides a novel efficient compressed air energy storage system, which comprises an air compression and cooling module, a heating and expansion power generation module, an intermediate heat storage and heat exchange module and valves and pipelines required by the system, wherein in the air compression process, heat is generated by air compression and is exchanged to heat conducting oil of the intermediate heat storage and heat exchange module, in the air expansion power generation process, the heat of the heat conducting oil is exchanged to the heating and expansion power generation module, and the air compression and expansion power generation only needs one-stage heat exchange, so that the air side resistance is greatly reduced, the power consumption of a compressor is reduced, the expansion power generation capacity is improved, the electric-electric conversion efficiency is further improved, the heat conducting oil is not used as a heat storage medium, the consumption can be greatly reduced, the overall investment of the heat storage system is relatively low, the power generation efficiency of the system is high, the investment is low, and the heat exchange effect is good.
Description
Technical Field
The utility model relates to the technical field of energy storage systems, in particular to a novel efficient compressed air energy storage system which uses air as an energy storage medium and is shared by various heat storage media, wherein the novel efficient compressed air energy storage system is non-afterburning.
Background
In the existing electric power energy storage technology, pumped storage and compressed air energy storage have the advantages of large scale, low cost, long service life and the like, and are recognized as the most suitable physical energy storage technology for large scale. Because the pumped storage technology is mature, the energy storage technology is the only energy storage technology which is widely popularized and utilized in China at present, but the technology has natural geographical condition limitation, particularly has regional dislocation with wind energy and solar energy resources in China, and the capacity and the function of the technology cannot completely meet the requirements of energy storage development in China (the energy storage machine in China can reach 10% -15% of the total electric power installation by 2050 and can exceed more than 2 times of the developable capacity of the pumped storage), so that the development of other large-scale energy storage technologies besides the pumped storage technology is imperative.
The compressed air energy storage has the advantages of large energy storage capacity, long energy storage period, small specific investment and the like, and is considered to be a large-scale energy storage technology with the widest development prospect. The electric-electric conversion efficiency of the prior advanced compressed air energy storage technology is only 70 percent, which is lower than that of the pumped storage technology, so that a novel compressed air energy storage system with higher efficiency is developed, the overall efficiency of the energy storage power station is improved, and the method has important significance in meeting the electric energy storage requirement of China, and is very necessary and urgent.
Disclosure of Invention
In order to solve the problems of low efficiency and high investment of the traditional compressed air energy storage system, the utility model provides a novel efficient compressed air energy storage system which has high power generation efficiency, low investment and good heat exchange effect.
In order to achieve the above purpose, the utility model provides a novel efficient compressed air energy storage system, which comprises an air compression and cooling module, a heating and expansion power generation module, an intermediate heat storage and exchange module and valves and pipelines required by the system.
The air compression and cooling module comprises a first-stage motor, a first-stage compressor, a first-stage air-oil cooler, a first-stage air-water separator, a second-stage motor, a second-stage compressor, a second-stage air-oil cooler, a second-stage air-water separator, a third-stage motor, a third-stage compressor, a third-stage air-oil cooler and a gas storage device which are sequentially connected.
The heating and expansion power generation module comprises a gas storage device, a primary gas-oil heater, a primary expander, a secondary gas-oil heater, a secondary expander and a generator which are connected in sequence.
The intermediate heat storage and exchange module comprises a water-oil heat exchanger, a molten salt-oil heat exchanger, a primary gas-oil cooler, a secondary gas-oil cooler, a tertiary gas-oil cooler, a primary gas-oil heater and a secondary gas-oil heater.
The primary gas-oil cooler, the secondary gas-oil cooler and the tertiary gas-oil cooler are connected with the water-oil heat exchanger and the molten salt-oil heat exchanger after being converged.
The primary gas-oil heater and the secondary gas-oil heater are connected with the water-oil heat exchanger and the molten salt-oil heat exchanger after being converged.
In the air compression process, heat generated by compression is exchanged into heat conduction oil through a primary air-oil cooler, a secondary air-oil cooler and a tertiary air-oil cooler, and the heat conduction oil sequentially passes through a water-oil heat exchanger and a molten salt-oil heat exchanger to exchange heat and cool and then returns to inlets of the primary air-oil cooler, the secondary air-oil cooler and the tertiary air-oil cooler, so that a primary circulating cooling process is completed.
In the air expansion power generation process, the heat conduction oil switches flow direction, and enters a primary gas-oil heater and a secondary gas-oil heater after heat is absorbed by a water-oil heat exchanger and a molten salt-oil heat exchanger, so as to heat high-pressure cold air at inlets of the primary expander and the secondary expander, and the cooled heat conduction oil returns to the inlet of the water-oil heat exchanger to complete a primary circulation heating process.
Further, the outlets of the primary gas-water separator and the secondary gas-water separator are respectively provided with a bypass compressed air pipeline which is directly connected with the inlet of the gas storage device.
Further, the intermediate heat storage and exchange module further comprises a low-temperature molten salt storage tank, a high-temperature molten salt storage tank, a molten salt pump, a high-pressure cold water tank, a high-pressure hot water tank and a high-pressure water pump, wherein the low-temperature molten salt storage tank and the high-temperature molten salt storage tank are connected with the molten salt-oil heat exchanger through the molten salt pump, the high-pressure cold water tank and the high-pressure hot water tank are connected with the water-oil heat exchanger through the high-pressure water pump, and a valve for controlling flow direction is arranged on a connecting pipe.
Further, the primary gas-oil cooler, the secondary gas-oil cooler, the tertiary gas-oil cooler, the primary gas-oil heater, the secondary gas-oil heater, the molten salt-oil heat exchanger and the water-oil heat exchanger are all hairpin heat exchangers or shell-and-tube heat exchangers.
Further, a heat conduction oil pump is arranged between the water-oil heat exchanger and the molten salt-oil heat exchanger, and the change of the flow direction of the medium is realized by opening/closing a valve or adopting a bidirectional pump.
Further, the heat conduction oil pump is connected with the expansion oil tank, and the expansion oil tank (26) is a normal pressure oil tank communicated with the atmosphere.
The utility model has the following advantages and effects:
(1) Only one-stage heat exchange is needed for air compression and expansion work, so that the air side resistance is greatly reduced, the power consumption of the compressor is reduced, the expansion power generation capacity is improved, and the electric-electric conversion efficiency is further improved;
(2) The heat conducting oil is not used as a heat storage medium, but is used as an intermediate heat transfer medium, so that the consumption can be greatly reduced, and the overall investment of the heat storage system is relatively low;
(3) The air-side heat exchange system is used for air-heat conducting oil heat exchange, and the heat conducting oil medium is stable and has good heat exchange effect, and is superior to the air-molten salt heat exchange or air-hot water heat exchange of the traditional compressed air energy storage power station;
(4) The flow direction can be switched through valves in the molten salt and hot water heat storage and release processes, the quantity of the conveying pump and the heat exchanger can be halved, and the system investment is reduced;
(5) The overall efficiency of the energy storage power station is improved.
Drawings
Fig. 1 is a schematic diagram of a novel efficient compressed air energy storage system provided by the utility model.
The device comprises a first-stage motor, a first-stage compressor, a first-stage gas-oil cooler, a first-stage gas-water separator, a first-stage motor, a second-stage motor, a first-stage compressor, a second-stage compressor, a first-stage gas-oil cooler, a second-stage gas-water separator, a first-stage motor, a third-stage motor, a first-stage compressor, a third-stage compressor, a first-stage motor, a third-stage gas-oil cooler, a first-stage expander, a first-stage gas-oil heater, a second-stage expander, a second-stage gas-oil heater, a first-stage generator, a second-stage generator, a low-temperature molten salt storage tank, a first-temperature molten salt storage tank, a high-temperature molten salt storage tank, a first-temperature molten salt storage tank, a second-temperature molten salt pump, a second-oil heat exchanger, a high-temperature molten salt-oil heat exchanger, a high-pressure water-oil storage tank, a high-pressure water-temperature heat exchanger, a second-expansion tank and a heat-conducting oil pump.
Detailed Description
The novel efficient compressed air energy storage system shown in fig. 1 comprises an air compression and cooling module, a heating and expansion power generation module and an intermediate heat storage and exchange module.
The air compression and cooling part comprises a first-stage motor 1, a first-stage compressor 2, a first-stage air-oil cooler 3, a first-stage air-water separator 4, a second-stage motor 5, a second-stage compressor 6, a second-stage air-oil cooler 7, a second-stage air-water separator 8, a third-stage motor 9, a third-stage compressor 10, a third-stage air-oil cooler 11 and a gas storage device 12 which are sequentially connected. The outlets of the primary gas-water separator 4 and the secondary gas-water separator 8 are connected with the inlet of the gas storage device 12 through bypass compressed air pipelines.
By consuming externally supplied power, the primary motor 1 drives the primary compressor 2 to rotate the impeller, creating a negative pressure at the compressor inlet, and outside air is drawn into the primary compressor 2 to boost pressure. During energy storage, the primary compressor 2 is started preferentially, and compressed air is directly filled into the air storage device 12 through the bypass compressed air pipeline. After the pressure in the gas storage device 12 reaches the rated outlet pressure of the compressor, the primary bypass pipeline is closed, the secondary compressor 6 is started, and the secondary bypass pipeline is opened. And after the pressure in the gas storage device 12 reaches the rated outlet pressure of the compressor, closing the secondary bypass pipeline and starting the tertiary compressor 10.
The pressure and temperature of the compressed air are greatly improved, and the low-temperature high-pressure air enters the air storage device 12 for storage after the liquid water is removed by each stage of air-water separators through cooling of each stage of air-oil cooler. Thus, the air compression and cooling process is completed.
The heating and expansion power generation part comprises a gas storage device 12, a primary expander 13, a primary gas-oil heater 14, a secondary expander 15, a secondary gas-oil heater 16 and a generator 17 which are connected in sequence.
The low-temperature high-pressure air stored by the air storage device 12 is heated by the air-oil heater of each stage, and the high-temperature air enters the expansion machines 13 and 15 to push the impellers to do work and cool, so that the generator 17 is driven to supply power to the outside. Thus, the heating and expansion power generation process is completed.
The intermediate heat storage and exchange part comprises a low-temperature molten salt storage tank 18, a high-temperature molten salt storage tank 19, a molten salt pump 20, a molten salt-oil heat exchanger 21, a high-pressure cold water tank 22, a high-pressure hot water tank 23, a high-pressure water pump 24, a water-oil heat exchanger 25, an expansion oil tank 26, a heat conduction oil pump 27, a primary gas-oil cooler 3, a secondary gas-oil cooler 7, a tertiary gas-oil cooler 11, a primary gas-oil heater 14 and a secondary gas-oil heater 16.
The low-temperature molten salt storage tank 18 and the high-temperature molten salt storage tank 19 are connected with the molten salt-oil heat exchanger 21 through the molten salt pump 20, the high-pressure cold water tank 22 and the high-pressure hot water tank 23 are connected with the water-oil heat exchanger 25 through the high-pressure water pump 24, and a valve for controlling the flow direction is arranged on a connecting pipeline.
The primary gas-oil cooler 3, the secondary gas-oil cooler 7 and the tertiary gas-oil cooler 11 are connected with the water-oil heat exchanger 25 and the molten salt-oil heat exchanger 21 after being converged. The primary gas-oil heater 14 and the secondary gas-oil heater 16 are connected with the water-oil heat exchanger 25 and the molten salt-oil heat exchanger 21 after being connected through pipelines.
The primary gas-oil cooler 3, the secondary gas-oil cooler 7, the tertiary gas-oil cooler 11, the primary gas-oil heater 14, the secondary gas-oil heater 16, the molten salt-oil heat exchanger 21 and the water-oil heat exchanger 25 are all hairpin heat exchangers, and shell-and-tube heat exchangers can also be adopted.
A heat-conducting oil pump 27 is arranged between the water-oil heat exchanger 25 and the molten salt-oil heat exchanger 21, and the change of the flow direction of the medium is realized by opening/closing a valve or adopting a two-way pump.
The heat conduction oil pump 27 is connected with the expansion oil tank 26, the expansion oil tank 26 adopts a normal pressure oil tank communicated with the atmosphere, and the capacity can meet the volume increase of the heat conduction oil under the high temperature condition, and meanwhile, the inlet pressure of the heat conduction oil pump 27 is stabilized.
In the air compression process, heat generated by compression is exchanged into heat conduction oil through the primary air-oil cooler 3, the secondary air-oil cooler 7 and the tertiary air-oil cooler 11, and the heat conduction oil sequentially passes through the water-oil heat exchanger (25) and the molten salt-oil heat exchanger (21) for heat exchange and cooling and then returns to inlets of the primary air-oil cooler (3), the secondary air-oil cooler 7 and the tertiary air-oil cooler 11 to finish a primary circulating cooling process.
In the air expansion power generation process, the heat conducting oil switches flow direction, absorbs heat through the water-oil heat exchanger 25 and the molten salt-oil heat exchanger 21, then enters the primary air-oil heater 14 and the secondary air-oil heater (16), heats high-pressure cold air at the inlets of the primary expander 13 and the secondary expander 15, and returns the cooled heat conducting oil to the inlet of the water-oil heat exchanger 25 to complete a primary circulation heating process.
Claims (6)
1. Novel high-efficient compressed air energy storage system, its characterized in that: the system comprises an air compression and heat exchange module, a heat exchange and expansion power generation module, an intermediate heat storage and heat exchange module and valves and pipelines required by the system;
the air compression and heat exchange module comprises a first-stage motor (1), a first-stage compressor (2), a first-stage air-oil cooler (3), a first-stage air-water separator (4), a second-stage motor (5), a second-stage compressor (6), a second-stage air-oil cooler (7), a second-stage air-water separator (8), a third-stage motor (9), a third-stage compressor (10), a third-stage air-oil cooler (11) and a gas storage device (12) which are connected in sequence;
the heat exchange and expansion power generation module comprises a gas storage device (12), a primary gas-oil heater (14), a primary expander (13), a secondary gas-oil heater (16), a secondary expander (15) and a generator (17) which are connected in sequence;
the intermediate heat storage and exchange module comprises a water-oil heat exchanger (25), a molten salt-oil heat exchanger (21), a primary gas-oil cooler (3), a secondary gas-oil cooler (7), a tertiary gas-oil cooler (11), a primary gas-oil heater (14) and a secondary gas-oil heater (16);
the primary gas-oil cooler (3), the secondary gas-oil cooler (7) and the tertiary gas-oil cooler (11) are connected with the water-oil heat exchanger (25) and the molten salt-oil heat exchanger (21) after being converged;
the primary gas-oil heater (14) and the secondary gas-oil heater (16) are connected with the water-oil heat exchanger (25) and the molten salt-oil heat exchanger (21) after being converged;
in the air compression process, heat generated by compression is exchanged into heat conduction oil through a primary air-oil cooler (3), a secondary air-oil cooler (7) and a tertiary air-oil cooler (11), and the heat conduction oil is returned to inlets of the primary air-oil cooler (3), the secondary air-oil cooler (7) and the tertiary air-oil cooler (11) after passing through a water-oil heat exchanger (25) and a molten salt-oil heat exchanger (21) in turn for heat exchange and cooling, so that a primary circulating cooling process is completed;
in the air expansion power generation process, the heat conduction oil switches flow direction, absorbs heat through a water-oil heat exchanger (25) and a molten salt-oil heat exchanger (21), then enters a primary gas-oil heater (14) and a secondary gas-oil heater (16), heats high-pressure cold air at inlets of a primary expander (13) and a secondary expander (15), and returns the cooled heat conduction oil to the inlet of the water-oil heat exchanger (25) to complete a primary circulation heating process.
2. The novel efficient compressed air energy storage system of claim 1, wherein: the outlets of the primary gas-water separator (4) and the secondary gas-water separator (8) are respectively provided with a bypass compressed air pipeline which is directly connected with the inlet of the gas storage device (12).
3. The novel efficient compressed air energy storage system of claim 1, wherein: the intermediate heat storage and heat exchange module further comprises a low-temperature molten salt storage tank (18), a high-temperature molten salt storage tank (19), a molten salt pump (20), a high-pressure cold water tank (22), a high-pressure hot water tank (23), a high-pressure water pump (24), wherein the low-temperature molten salt storage tank (18) and the high-temperature molten salt storage tank (19) are connected with the molten salt-oil heat exchanger (21) through the molten salt pump (20), the high-pressure cold water tank (22) and the high-pressure hot water tank (23) are connected with the water-oil heat exchanger (25) through the high-pressure water pump (24), and a valve for controlling flow direction is arranged on a connecting pipe.
4. The novel efficient compressed air energy storage system of claim 1, wherein: the primary gas-oil cooler (3), the secondary gas-oil cooler (7), the tertiary gas-oil cooler (11), the primary gas-oil heater (14), the secondary gas-oil heater (16), the molten salt-oil heat exchanger (21) and the water-oil heat exchanger (25) are all hairpin heat exchangers or shell-and-tube heat exchangers.
5. The novel efficient compressed air energy storage system of claim 1, wherein: a heat conduction oil pump (27) is arranged between the water-oil heat exchanger (25) and the molten salt-oil heat exchanger (21), and the flow direction change of the medium is realized by opening/closing a valve or adopting a two-way pump.
6. The novel efficient compressed air energy storage system of claim 5, wherein: the heat conduction oil pump is characterized by further comprising an expansion oil tank (26), wherein the heat conduction oil pump (27) is connected with the expansion oil tank (26), and the expansion oil tank (26) is an atmospheric oil tank communicated with the atmosphere.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202320287460.1U CN219344900U (en) | 2023-02-22 | 2023-02-22 | Novel high-efficient compressed air energy storage system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202320287460.1U CN219344900U (en) | 2023-02-22 | 2023-02-22 | Novel high-efficient compressed air energy storage system |
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