Compressed air energy storage method and energy storage system

Abstract

The invention discloses a compressed air energy storage method. The compressed air energy storage method comprises the following steps that an underground aquifer serves as an air storage chamber of acompressed air energy storage system, and the development and application of the compressed air energy storage system are free from the limitation of geological conditions; the underground aquifer serves as the air storage chamber for storing compressed air, it is guaranteed that in the system energy releasing process, the pressure of the compressed air at an outlet of the air storage chamber isapproximately invariable, and the throttling loss caused by the throttling pressure reducing action of a throttling valve in a traditional compressed air energy storage system is avoided; compressionheat generated in the compression process is absorbed by a heat transferring medium from a heat network heat exchanger and is absorbed in a cooler, and the heated heat transferring medium is used forsupplying heat to heat consumers in a heat supply network; in the energy releasing process, a low-grade heat source is used for heating pre-stage inlet steam of an expansion machine, so that the powercapability of the compressed air can be greatly improved; and steam exhaust of a turbine unit enters a lithium bromide absorption refrigerating machine to serve as a high-temperature heat source of the refrigerating machine, and cooling capacity is supplied outside through the refrigerating machine.

Description

technical field [0001] The invention relates to the technical field of electric energy storage, in particular to a compressed air energy storage method and an energy storage system. Background technique [0002] At present, my country's energy structure is undergoing major changes, and the proportion of renewable energy such as solar energy and wind energy in the total power supply is getting higher and higher. However, due to the inherent defects of intermittent and unstable renewable energy power, its reliability and flexibility are greatly reduced in practical applications, which limits the grid-connected power generation of renewable energy power. Therefore, the development of electric energy storage technology is an important way to stabilize the peak-valley difference of the power grid and increase the access rate of renewable energy. At present, apart from pumped storage technology, compressed air energy storage technology is the only technology that can realize larg...

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Problems solved by technology

[0003] Most compressed air energy storage power stations build large gas storage chambers based on salt caverns, abandoned mines, rock caves, etc. The special requirements for geological conditions limit the development and application of compressed air energy storage systems

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