Heat pump compressed air energy storage system

Abstract

The invention discloses a heat pump compressed air energy storage system. The heat pump compressed air energy storage system comprises a heat pump high-temperature heating cycle loop and a compressedair energy storage and energy release loop. The heat pump compressed air energy storage system compresses the air into a high-pressure state through off-peak (low-price) electricity of a power station, stores air compression heat and produces and stores high-temperature heat through the heat pump high-temperature heating cycle loop. During the period of electricity consumption peak, the high-pressure compressed air absorbs the stored compression heat and the stored high-temperature heat energy in sequence and then is fed into an expansion machine to drive a power generator to generate electricity. The heat pump compressed air energy storage system provided by the invention has the advantages of being simple in structure, high in efficiency, strong in flexibility, suitable for peak regulation of a power grid and various types of renewable energy source power stations, free of generation of greenhouse gases and the like.

Description

technical field [0001] The invention belongs to the technical field of energy storage, and relates to a heat pump compressed air energy storage system, which is an energy storage system based on a heat pump cycle and compressed air to store energy and utilize the stored energy to generate electric energy. Background technique [0002] In recent years, renewable energy is gradually becoming an important source of new electricity, and major changes have taken place in the grid structure and operation mode. With the increasing popularity of renewable energy (wind energy, solar energy, etc.), and the urgent need for grid peak regulation, improving grid reliability, and improving power quality, the importance of power energy storage systems has become increasingly prominent. Energy storage is an important component and key supporting technology of smart grids, energy systems with a high proportion of renewable energy, and "Internet +" smart energy (hereinafter referred to as ener...

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Problems solved by technology

However, the energy storage density of compressed air energy storage technology is low, and the difficulty lies in the need for suitable places where compressed air can be stored, such as sealed caves or abandoned mines, etc.

Moreover, the compressed air energy storage system still relies on the burning of fossil fuels to provide heat sources. On the one hand, it faces the threat of the gradual depletion of fossil fuels and rising prices; Zero emissions), renewable energy development requirements

[0006] In order to solve the main problems faced by traditional compressed air energy storage systems, domestic and foreign scholars have carried out advanced adiabatic compressed air energy storage systems (AACAES), surface compressed air energy storage systems (SVCAES), compressed air storage Energy storage system (AACAES) and air-steam combined cycle compressed air energy storage system (CASH), etc., make the compressed air energy storage system basically avoid burning fossil fuels, but the energy density of the compressed air energy storage system is still very low, requiring a large storage chamber

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