Compressed air energy storage system coupled with Kalina cycle

Abstract

The invention provides a compressed air energy storage system coupled with Kalina cycle, and belongs to the technical field of energy storage. The system comprises a double-layer storage tank and a Kalina cycle unit. The double-layer storage tank, a multi-stage cooler, a heat storage tank, a multi-stage heat regenerator, a C1 port and a D1 port are sequentially communicated to form a circulation loop, and an internal flowing medium is heat conduction oil; the heat conduction oil is heated by compressed air and then stored in the heat storage tank; the heat conduction oil heats the compressed air flowing through the multi-stage heat regenerator; and the heat conduction oil heats an ammonia water solution flowing through an evaporator by utilizing residual heat and flows back to the double-layer storage tank. A port B1, a separator, an ammonia expansion machine, an absorber, a condenser, a working medium pump, a port C2, a port D2 and a port A1 are sequentially communicated to form a circulation loop, an internal flowing medium is an ammonia water solution; and the ammonia expansion machine is used for expanding ammonia-rich steam from the separator to do work and pushing a second power generator to output electric power. Therefore, the energy storage capacity of the system can be effectively increased, heat loss in the energy storage process is reduced, and the energy storage efficiency is improved.

Description

technical field [0001] The invention relates to the technical field of energy storage, in particular to a compressed air energy storage system coupled with a Karina cycle. Background technique [0002] With the vigorous development of renewable energy, distributed energy supply and smart grid in China, the capacity of the grid continues to expand, and the peak-to-valley difference in power consumption is increasing, and the demand for energy storage technology is increasing. The large-scale development of energy storage technology can effectively solve the problem of unstable power generation of intermittent renewable energy such as wind energy and solar energy, smooth fluctuating power input, realize peak-shaving and valley-filling of the power grid, improve the utilization rate of renewable energy power generation, and enhance power grid operation security. [0003] Among the existing large-scale electric energy storage technologies, compressed air energy storage has been...

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Problems solved by technology

[0004] However, the existing advanced adiabatic compressed air energy storage (AA-CAES) system will generate a large amount of compression heat during operation, which cannot be completely transferred to the energy release process due to the limitation of the heat transfer temperature difference of the heat exchanger. Compressed air, so the heat of the system cannot be fully utilized, reducing the operating efficiency of the system, and at the same time, it will cause the temperature of the heat storage medium in the heat storage system to rise, which will have an adverse effect on the next operation of the system. The solution is usually to introduce additional cooling device, but this will lead to an increase in system complexity and waste of heat

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