Compressed carbon dioxide energy storage system and method of operation thereof

By storing liquid carbon dioxide at room temperature and utilizing cold energy for condensation, the energy loss problem caused by dependence on low-temperature cold sources in existing technologies is solved, achieving efficient energy storage and utilization, simplifying the system structure, and reducing costs.

CN115823923BActive Publication Date: 2026-07-24ZHEJIANG UNIV
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Patent Information

Application Number
CN202211617261.9
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2022-12-15
Publication Date
2026-07-24
Estimated Expiration
2042-12-15

AI Technical Summary

Technical Problem

In existing compressed carbon dioxide energy storage technologies, low-pressure storage tanks require the use of low-temperature cold sources for condensation, resulting in large system energy losses and low energy storage efficiency.

Method used

Liquid carbon dioxide is stored at room temperature, and its pressure is reduced to above the triple point pressure through the first throttling valve. The first heat exchanger stores the cold energy, and the stored cold energy is used to condense carbon dioxide during the energy release process. Combined with the cold storage, it provides heat or cold source, simplifying the system structure and reducing dependence on external low-temperature cold sources.

Benefits of technology

It improves system energy storage efficiency, reduces energy loss, enhances system flexibility and energy utilization, reduces dependence on external low-temperature cold sources, and reduces system complexity and cost.

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Abstract

The application provides a compressed carbon dioxide energy storage system and an operation method thereof, which comprises: low-pressure storage tanks, first throttles, first heat exchangers, compressor sets, coolers, high-pressure storage tanks, second throttles, reheaters, expander sets, second heat exchangers, pressure increasing devices and third heat exchangers which are sequentially connected to form a closed cycle; the low-pressure storage tanks are used for storing liquid carbon dioxide at normal temperature; the internal pressure of the low-pressure storage tanks is 3.5-7.2 MPa; the carbon dioxide at the outlet of the low-pressure storage tanks is stored in the high-pressure storage tanks in a liquid state or a supercritical state after being throttled, decompressed, compressed and cooled; the pressure of the high-pressure storage tanks is 7.4-25 MPa; the carbon dioxide at the outlet of the high-pressure storage tanks enters the low-pressure storage tanks in a normal-temperature liquid state after being throttled, reheated, expanded, cooled, pressurized and heat-exchanged; and the cold source required for cooling is obtained from the cold energy stored in the first heat exchangers and / or the third heat exchangers. The application can realize the liquid storage of carbon dioxide at normal temperature, reduces the dependence on low-temperature cold sources and improves the energy storage efficiency.
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