Near-isothermal compressed-air energy storage system and operating method thereof
A compressed air energy storage and isothermal technology, which is applied in solar thermal power generation, mechanical power generation with solar energy, steam engine installations, etc., can solve the problems of inability to absorb reactive power, blockage, etc., and achieve the goal of improving energy efficiency and energy density Effect
Active Publication Date: 2021-06-04
XI AN JIAOTONG UNIV
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Problems solved by technology
[0003] For the DC side of the battery energy storage system, reactive power cannot be absorbed, and at the same time, it will be accompanied by effects such as DC blocking
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[0079] Preparatory stage: Use compressor 28 to fill air into high-pressure gas storage space 21 and low-pressure gas storage space 22, so that the pressure of the two gas storage spaces reaches the set value, and at the same time adjust the water level and pressure inside the water-gas storage tank. Compressor 28 is started when the system leaks air.
[0080] Storage stage: The excess electric energy drives the water pump to do work, and the gas is released from the low-pressure gas storage space 22 and enters the high-pressure gas storage space 21 after passing through the compression system.
[0081] Energy release stage: the gas inside the high-pressure gas storage space 21 passes through the regenerator 26 and the reheater 23 and then enters the turbo expander 25 to do work, and the exhaust gas from the turbine passes through the regenerator 26 and then enters the low-pressure gas storage space for storage.
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The invention provides a near-isothermal compressed-air energy storage system and an operating method thereof. The near-isothermal compressed-air energy storage system comprises a high-pressure air storage space, a low-pressure air storage space, a heat collection system, a multi-tank water-pumping compressed-air energy storage device, an energy release part and a compressor, wherein the energy release part comprises a reheater and an expansion turbine; an outlet of the low-pressure air storage space, the multi-tank water-pumping compressed-air energy storage device and an inlet of the high-pressure air storage space communicate with one another sequentially; the outlet of the high-pressure air storage space, the reheater and the expansion turbine communicate with one another sequentially; an outlet of the expansion turbine communicates with the low-pressure air storage space; an inlet and an outlet of the heat collection system communicate with an outlet and an inlet of a heat-conducting medium of the reheater separately; near-isothermal compression is realized in the compression process, so that remarkable compression heat is avoided; closed circulation is adopted, so that the overall air operating pressure is increased, and the energy density of the system is increased; and a multi-tank compression structure is adopted, so that the defect of huge water consumption of a single tank is overcome; and large-scale application of the energy storage system is realized.
Description
technical field [0001] The invention belongs to the technical field of compressed air energy storage, and in particular relates to a near-isothermal compressed air energy storage system and an operating method thereof. Background technique [0002] At present, large-scale power generation systems in the form of photovoltaics, wind power, and thermal power have been built in high-altitude areas, plateau areas, or desertified areas. Renewable energy has the characteristics of randomness and volatility. In order to meet the needs of the power grid, it is necessary to build a large-scale energy storage system. At this stage, the energy storage part used in conjunction with photovoltaic power plants and wind farms is mainly based on battery energy storage. [0003] For the DC side of the battery energy storage system, reactive power cannot be absorbed, and at the same time, effects such as DC blocking will occur. Contents of the invention [0004] In order to solve the proble...
Claims
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IPC IPC(8): F03G6/06F03G6/04F01K3/14F01K7/16F04B35/02F04B41/02F04B41/06
CPCF03G6/067F03G6/04F01K3/14F01K7/16F04B35/008F04B41/02F04B41/06Y02E10/46
Inventor 王焕然李丞宸贺新杨珍帅李智搏
Owner XI AN JIAOTONG UNIV
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