Compressed air energy storage system and energy storage method

Abstract

The invention relates to the technical field of energy storage, and discloses a compressed air energy storage system and an energy storage method. The compressed air energy storage system comprises anair compressor, a heat exchanger, a gas storage, an air expansion, a heat regenerator and a heat accumulator. An air outlet of the air compressor communicates with a gas-phase space of the gas storage through a first heat exchanging pipeline of the heat exchanger, the gas-phase space is further connected with an inlet of the air expansion through a third heat exchanging pipeline of the heat regenerator, a heat storage medium space of the gas storage is connected with an inlet of the heat accumulator through a second heat exchanging pipeline of the heat exchanger, and an outlet of the heat accumulator is connected to the heat storage medium space through a fourth heat exchanging pipeline of the heat regenerator. According to the energy storage method of the energy storage system, energy-releasing storage is combined with a heat energy storage system, the gas storage, the heat exchanger, the heat accumulator and the heat regenerator are used for forming a heat regenerative cycle, internal heat balance and pressure balance of the compressed air energy storage system can be simultaneously realized, and the conditions of variable backpressure operation of the air compressor becoming and sliding pressure operation of the air expansion are avoided.

Description

technical field

[0001] The invention relates to the technical field of energy storage, in particular to a compressed air energy storage system and an energy storage method. Background technique

[0002] Energy storage, especially electric energy storage, is of great significance to the optimization of energy structure and the regulation of power grid operation. Compressed air energy storage system is a new energy storage technology. The working principle of the compressed air energy storage power generation system is similar to that of pumped water storage. When the electricity consumption of the power system is at a low point, the system stores energy and utilizes the surplus electricity in the system. The compressor drives the air compressor to compress the air and convert the energy to The form of compressed air is stored in the gas storage device; when the electricity load of the power system reaches the peak power generation capacity, the system releases energy, and th...

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