A near-isothermal compressed air energy storage system and its operating method

A compressed air energy storage, isothermal technology, applied in solar thermal power generation, mechanical power generation with solar energy, piston pump, etc., can solve the problems of inability to absorb reactive power, blocking, etc. Effect

Active Publication Date: 2022-06-07
XI AN JIAOTONG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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

Method used

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  • A near-isothermal compressed air energy storage system and its operating method
  • A near-isothermal compressed air energy storage system and its operating method
  • A near-isothermal compressed air energy storage system and its operating method

Examples

Experimental program
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Effect test

Embodiment approach

[0079] Preparation stage: use the compressor 28 to fill the high-pressure air storage space 21 and the low-pressure air storage space 22 with air, so that the pressure of the two air storage spaces reaches the set value, and adjust the water level and pressure inside the water-air co-capacity tank, only when supplementing Compressor 28 is activated in the event of a system leak.

[0080] Storage stage: the surplus electric energy drives the water pump to do work, the gas is released from the low-pressure gas storage space 22, and enters the high-pressure gas storage space 21 after being compressed by the system.

[0081] Energy release stage: the gas in the high-pressure gas storage space 21 passes through the regenerator 26 and the reheater 23 and then enters the turboexpander 25 to perform work, and the turbine exhaust gas passes through the regenerator 26 and enters the low-pressure gas storage space for storage.

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Abstract

The invention discloses a near-isothermal compressed air energy storage system and its operating method. The system includes a high-pressure gas storage space, a low-pressure gas storage space, a heat collection system, a multi-tank pumped compressed air energy storage device, an energy release unit, and a compressor; The energy release part includes a reheater and a turbo expander; the outlet of the low-pressure gas storage space, the multi-tank pumped compressed air energy storage device and the inlet of the high-pressure gas storage space are connected in sequence; the outlet of the high-pressure gas storage space, the reheater and the The turboexpanders are connected sequentially; the outlet of the turboexpander is connected to the low-pressure gas storage space; the inlet and outlet of the heat collection system are respectively connected to the outlet and inlet of the heat transfer medium of the reheater; the compression process is close to isothermal / near isothermal compression, without significant compression Heat generation, using a closed cycle, raising the overall gas working pressure, can increase the energy density of the system, using a multi-tank compression structure to overcome the defect of a single tank with huge water consumption, and realize the large-scale application of the energy storage system .

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 operation method thereof. Background technique [0002] At present, large-scale photovoltaic, wind power, thermal power and other forms of power generation systems 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 demand of the power grid, it is necessary to build a large-scale energy storage system. At this stage, the energy storage part of photovoltaic power plants and wind farms is mainly battery energy storage. [0003] For the DC side of the battery energy storage system, reactive power cannot be absorbed, and at the same time, there will be effects such as DC blocking. SUMMARY OF THE INVENTION [0004] In order to solve the problems existing in the prior art, ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
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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