Combined heat-accumulating compact compressed air energy storage system and method

Abstract

The invention discloses a combined heat-accumulating compact compressed air energy storage system and method. The system comprises a filling heat accumulation device, a common loop, an air storage tank, an auxiliary loop and an acting loop, wherein the filling heat accumulation device is connected with the common loop in series, the auxiliary loop is connected with the common loop in parallel, the air storage tank and the acting loop are connected with a heat exchanger in the common loop, a compressor and an expander are connected into the acting loop, the common loop is adopted for energy storage and energy release, and the common loop is heated through the auxiliary loop in the energy release process. The system solves problems that in an original system, a heat accumulation loop and a heat release loop are independent of each other, the occupied space is large, the acting temperature in the energy release process cannot meet the requirement, the conversion efficiency is reduced, and the system stability is affected. The system has the advantages that the structure is simple, all devices and loops in the system are integrated compactly, the occupied space is small, the auxiliary loop heats the common loop when the acting temperature cannot meet the requirement in the energy release process, and the conversion efficiency and stability of the system are improved.

Description

technical field [0001] The invention belongs to the technical field of energy storage, and relates to a combined heat storage compact compressed air energy storage system and method. Background technique [0002] Compressed air energy storage technology can currently be divided into supplementary combustion and non-supplementary combustion. Although the patent CN105370408A proposes a compact heat storage system, the heat storage range of the heat storage subsystem is relatively low, and water is used as the heat transfer medium and Although the heat storage medium can reduce the investment cost, 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, and the overall efficiency of thermoelectric conversion needs to be improved. Patent CN105370408 adopts a high-temperature heat storage subsystem, which can increase the temperature of the ...

AI Technical Summary

Problems solved by technology

However, in the above technical solution, two sets of equipment and two sets of pipelines are used for heat storage and heat release, which makes the entire system occupy a large space; secondly, in the process of energy storage, if the energy storage temperature does not reach the set value, the work conversion efficiency will be reduced. low, the system is unstable

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