A carnot cell utilizing lng cold energy

CN115682797BActive Publication Date: 2026-07-03CHINA CHENGDA ENG

Patent Information

Authority / Receiving Office: CN · China
Patent Type: Patents(China)
Current Assignee / Owner: CHINA CHENGDA ENG
Filing Date: 2022-11-04
Publication Date: 2026-07-03

AI Technical Summary

Technical Problem

Existing energy storage technologies such as battery and gas turbine power generation suffer from high costs, short lifespans, or insufficient biomass supply. Carnot batteries have advantages in storing and providing heat and cooling, but there is still room for improvement.

Method used

Design a Carnot battery that utilizes the cold energy of LNG. By combining a compression power system and a steam power generation system with Rankine and Carnot cycles, the battery converts electrical energy into thermal energy and uses the cold energy of LNG for gasification to support the supply of LNG to downstream users.

Benefits of technology

It achieves efficient energy storage while reducing energy storage costs, improving cycle life, and utilizing LNG cold energy gasification to support LNG supply, making it suitable for energy systems in a carbon neutral context.

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Figure CN115682797B_ABST

Patent Text Reader

Abstract

The present application belongs to the technical field of energy storage, and particularly relates to a Carnot cell utilizing LNG cold energy. The technical scheme is as follows: a Carnot cell utilizing LNG cold energy, comprising a compression working system, a steam power generation system, a low-temperature molten salt storage tank and a high-temperature molten salt storage tank, the input end of the compression working system utilizes electric energy, the compression working system comprises a heat exchanger, a heat storage pipeline is connected between the molten salt outlet of the low-temperature molten salt storage tank and the molten salt inlet of the high-temperature molten salt storage tank, the heat storage pipeline passes through the heat exchanger to absorb medium heat, a heat release pipeline is connected between the molten salt outlet of the high-temperature molten salt storage tank and the molten salt inlet of the low-temperature molten salt storage tank, and the heat release pipeline passes through a steam generator to heat the medium; and the Carnot cell further comprises an LNG pipeline, the cooling unit of the compression working system and the cooling unit of the steam power generation system are both heat-exchanged with the LNG pipeline. The present application provides a Carnot cell which fully utilizes LNG cold energy.

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