A liquid air energy storage system coupled with LNG cold energy and its control method

By designing a liquid air energy storage system coupled with LNG cold energy and adopting a dynamic control method, the utilization of cold energy is optimized, the problem of improper cold energy allocation is solved, and the energy storage efficiency and system stability are improved.

CN119266948BActive Publication Date: 2026-03-13NANJING TECH UNIV
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2024-11-08
Publication Date
2026-03-13

AI Technical Summary

Technical Problem

Existing liquid air energy storage systems, when coupled with LNG cold energy, suffer from improper cold energy allocation, resulting in cold energy waste and low energy storage efficiency. Furthermore, fluctuations in the cold energy of the cold storage unit affect system stability.

Method used

A liquid air energy storage system coupled with LNG cold energy was designed, including an LNG vaporization subsystem, a compressed air liquefaction subsystem, a vaporized liquid air expansion and power generation system, and a waste heat recovery and circulation subsystem. The flow rate of the heat transfer medium is adjusted by dynamically controlling valves and flow controllers to optimize the utilization of cold energy.

Benefits of technology

It improves the liquefaction rate and power generation of the liquid air energy storage system, enhances the system's flexibility, adaptability and stability, and reduces the impact of cooling fluctuations on system performance.

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Abstract

This invention relates to a liquid air energy storage system coupled with LNG cold energy and its control method. It includes an LNG vaporization subsystem, a compressed air liquefaction subsystem, a vaporized liquid air expansion and power generation system, and a waste heat recovery and recycling subsystem. By utilizing a cold accumulator to store, recover, and apply the cold energy from LNG and liquid air vaporization to the liquid air energy storage system, it alleviates the problem of low energy storage efficiency caused by insufficient cold energy in the liquid air energy storage system. Furthermore, the control method dynamically controls the liquid air energy storage system coupled with LNG cold energy, reducing the impact of cold accumulator cold energy fluctuations on the system's liquefaction performance. This system not only utilizes LNG cold energy in a cascade manner and improves air liquefaction power, but also further enhances the stability of the liquefaction performance of the liquid air energy storage system.
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Citation Information

Patent Citations

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