Compressed air energy storage system and method based on heat storage and release shared loop

Abstract

The invention provides a compressed air energy storage system and method based on a heat storage and release shared loop. A packed bed heat storage device, a liquid storage tank and a shielding pump are sequentially connected in series to form the heat storage and release loop; a heat exchanger is located in the portion, between the flow type packed bed heat storage device and the shielding pump, of the heat storage and release loop; the side, close to the flow type packed bed heat storage device, of the heat exchanger is connected with a compressor; the side, close to the shielding pump, of the heat exchanger is connected with a high-pressure air storage chamber; and an expansion machine is connected into a pipeline between the compressor and the heat exchanger. The problem that the input cost of the system is too high due to the fact that two loops in an original system complete heat storage and heat release is solved. The compressed air energy storage system has the advantages that the structure is simple, heat storage and heat release share one loop, the heat storage efficiency is high, the structure is compact, the number of needed auxiliary and component devices is reduced, and the cost is low.

Description

technical field [0001] The invention belongs to the technical field of energy storage, and relates to a compressed air energy storage system and method based on a common circuit for heat storage and heat release. Background technique [0002] Compressed air energy storage is a large-scale physical energy storage technology - using air as the energy storage medium, when the power consumption is low, the rich electricity can be converted into electrical energy in the form of high-pressure air through the conversion path of electrical energy-mechanical energy-molecular energy Large-scale physical storage converts the stored high-pressure air into electrical energy for external output through the conversion path of molecular internal energy-mechanical energy-electrical energy during peak electricity consumption. Compressed air energy storage technology has the advantages of environmental friendliness, long service life, large capacity and safe operation. [0003] Compressed air...

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Problems solved by technology

[0004] Patents CN 105370408 A, CN 105370408 and Patent CN 107299891 B all use compressed air energy storage in a non-supplementary combustion mode. Although CN 105370408 A proposes a compact heat storage system, the heat storage range of the heat storage subsystem is relatively low , using water as the heat transfer medium and heat storage medium, although the investment cost can be reduced, but because the heat storage temperature and heat release temperature considered are not high, the heat transferred to the air entering the turbine during the energy release process is relatively low, The overall efficiency of thermoelectric conversion needs to be improved

In patents CN 105370408 and CN 107299891 B, a high-temperature thermal storage subsystem is used, which can increase the temperature of the air entering the turbine to a higher temperature during the energy release process, thereby improving the thermoelectric conversion efficiency of the system. Heat transfer oil is used as heat transfer medium and heat storage medium, and there are two independent circulation loops in the heat storage system during the energy storage process and energy release process, the initial investment cost is high

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