Small user test energy storage system: liquefied air energy storage system
The left picture shows a liquefied air energy storage system coupled with an organic Rankine cycle, which adopts multi-stage compression and multi-stage expansion. The system is divided into three parts: liquefied air energy storage, air energy generation and organic Rankine cycle.
The energy storage part of the liquefied air is mainly composed of motor, air compressor, heat exchanger, heat reservoir, cold storage, cold box, low-temperature expansion machine and liquid air storage tank. Air energy generation is mainly composed of cryogenic pump, gasification heat exchanger, cold storage device, heater, expander and generator. The organic Rankine cycle is mainly composed of heat exchanger, expansion machine and working medium pump.
The working process of the system is as follows: when storing energy, the electric energy from renewable energy generation or the surplus power grid drives the multi-stage air compressor, and the compressed high temperature and high pressure air is cooled by the heat exchanger and sent to the cold box for further cooling. After reaching a certain parameter, the pressure is reduced by the low temperature expansion machine and the liquefied air is stored in the liquid air storage tank. When the energy is released, the liquid air in the liquid air storage tank is pressurized by the cryogenic pump, and becomes high temperature and high pressure gaseous air through reheating, which enters the multistage expansion machine to expand and do work, driving the generator to rotate and generate electricity. The organic Rankine cycle partly absorbs the excess heat of the self-storage heat, and the organic working medium expands to generate power after endothermic gasification.
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