Compressed air energy storage power generation system integrated with CO2 heat pump and operation method of compressed air energy storage power generation system

Abstract

The invention discloses a compressed air energy storage power generation system integrated with a CO2 heat pump and an operation method of the compressed air energy storage power generation system. The compressed air energy storage power generation system comprises a double-tank type near-isothermal compressed air energy storage unit, a CO2 heat pump unit and an expansion generator set. The double-tank type near-isothermal compressed air energy storage unit is used for compressing air in a near-isothermal manner and storing internal energy; the CO2 heat pump unit is used for efficiently collecting heat and heating compressed air by using the heat, so that the working capacity of the compressed air and the energy storage density of the whole system are improved; the expansion generator set is used for high-temperature and high-pressure air expansion work power generation; based on the double-tank type near-isothermal water pumping compressed air principle, the advantages that a heat pump is high in efficiency and high in heat collection capacity are utilized, before compressed air enters the expansion generator set to be expanded for power generation, heat absorbed by heat pump working medium CO2 from the atmospheric environment is used for heating, and one unit of electric energy can generate heat with the same multiple as the heat pump circulation efficiency; the problem that the energy storage density of isothermal compressed air is insufficient under the same air storage condition is solved.

Description

technical field [0001] The invention belongs to the technical field of physical energy storage, in particular to an integrated CO 2 A heat pump compressed air energy storage power generation system and its operating method. Background technique [0002] With the rapid increase of the total installed capacity of new energy, solving the problems of instability and intermittency in the process of new energy power generation has become the main problem of large-scale utilization of new energy, and energy storage is one of its main solutions. Energy storage is to store energy through a certain medium and release the energy when needed. Compressed air energy storage and pumped storage are recognized as systems suitable for high-power, large-capacity energy storage of 100 megawatts. Although pumped storage power stations have high efficiency, the initial investment in large-scale pumped storage power stations is huge, and the construction period is long. It has very strict requir...

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Problems solved by technology

[0006] In order to solve the problem of low energy storage density of the near-isothermal compressed air energy storage power generation system in the prior art, the purpose of the present invention is to provide a high-efficiency near-isothermal compressed air energy storage power generation system and its operation method, through the near-isothermal compressed air energy storage Power generation system and CO 2 The integration of the heat pump unit not only effectively improves the working capacity and system efficiency of the compressed air in the near-isothermal compressed air energy storage power generation system, but also solves the key problem of low energy storage density in the near-isothermal compressed air system

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