Liquefied air energy storage system adopting liquefied natural gas for cold storage and method thereof

Abstract

The invention provides a liquefied air energy storage system adopting liquefied natural gas for cold storage. The liquefied air energy storage system comprises the liquefied air energy storage system, a natural gas pipeline network, a condensation evaporator, a liquefied natural gas expansion machine, a liquefied natural gas storage tank, a liquefied natural gas booster pump and a liquid air energy release power generation system, wherein the liquefied air energy storage system is used for converting air in the atmosphere into liquid air and recycling cold energy generated when the liquid air is gasified; a natural gas pipeline network; the condensation evaporator is used for exchanging heat in the liquid air gasification process and the high-pressure gaseous natural gas liquefaction process; the liquefied natural gas expansion machine is used for expanding the high-pressure liquefied natural gas from the condensation evaporator to low pressure and doing work to recover pressure energy; a liquefied natural gas storage tank; the liquefied natural gas booster pump is used for enabling the boosted liquefied natural gas to enter the liquefied air energy storage system and recycling the cold energy generated when the liquid air is gasified; and the liquid air energy release power generation system is used for heating the gaseous compressed air from the condensation evaporator and utilizing compressed air expansion to do work to generate power. The invention further provides a liquefied air energy storage method adopting the liquefied natural gas for cold storage.

Description

technical field [0001] The invention relates to the technical field of energy storage, in particular to a liquefied air energy storage system and method thereof using liquefied natural gas for cold storage. Background technique [0002] Liquefied air energy storage is a new type of energy storage technology. When storing energy, the system uses electricity to drive the air liquefaction device to generate liquefied air, which is stored in a low-temperature storage tank. When the energy is released, the liquefied air in the low-temperature storage tank is pressurized and heated. , and then drive the expander to generate power. Due to the high density of liquefied air, the volume of the storage tank can be greatly reduced. In the process of realizing the present invention, the inventors found that there are at least the following problems in the prior art: it is difficult to recover the cold energy released by the liquefied air during the gasification process, and the conventi...

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Problems solved by technology

In the process of realizing the present invention, the inventors found that there are at least the following problems in the prior art: it is difficult to recover the cold energy released by the liquefied air during the gasification process, and the conventional packed bed cold storage device is used, the equipment structure is complex, the volume is large, and Due to the problem of internal temperature uniformity, it will lead to a decrease in the grade of cold energy and irreversible loss

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