Cold heat electricity hydrogen carbon co-production system and method based on transcritical carbon dioxide energy storage

By coupling a transcritical carbon dioxide energy storage system with a methanol-to-hydrogen system, a combined cooling, heating, power, hydrogen, and carbon production system was achieved, solving the problems of insufficient utilization of low-grade heat and high transportation costs of carbon monoxide, and improving system efficiency and economy.

CN117430085BActive Publication Date: 2026-03-24XI AN JIAOTONG UNIV
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Patent Information

Application Number
CN202311358712.6
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2023-10-19
Publication Date
2026-03-24
Estimated Expiration
2043-10-19

AI Technical Summary

Technical Problem

Existing compressed carbon dioxide energy storage systems suffer from insufficient utilization of low-grade compression heat, requiring storage in low-pressure tanks, which affects system efficiency and economy. The methanol-to-hydrogen process has high energy consumption and increases costs due to the transportation of carbon monoxide.

Method used

By coupling a transcritical carbon dioxide energy storage system with a methanol steam reforming hydrogen production system and a methanol cracking hydrogen production system with a jet refrigeration system, the heat of carbon dioxide compression is used to provide heat for methanol steam reforming and methanol cracking, realizing combined cooling, heating, electricity, hydrogen and carbon production, avoiding the use of low-pressure storage tanks, and using carbon monoxide for on-site combustion heating.

Benefits of technology

This improved the system's economic efficiency and energy storage density, reduced investment in low-pressure storage tanks, increased hydrogen production efficiency, avoided carbon monoxide transportation costs, and achieved full utilization of resources.

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Abstract

The application discloses a cold-heat-electricity-hydrogen-carbon co-production system and method based on cross-critical carbon dioxide energy storage, and the method is as follows: carbon dioxide is compressed by a carbon dioxide compressor set and then enters an expander set to work and generate electricity; heat energy generated in the carbon dioxide compression process provides heat for a methanol water vapor reforming hydrogen production process and a methanol cracking hydrogen production process through a first heat exchanger and a second heat exchanger respectively; a solar power generation unit generates electricity to provide electric energy for the carbon dioxide compressor set, a methanol water vapor reforming hydrogen production reactor and a methanol cracking hydrogen production reactor; carbon dioxide generated in the methanol water vapor reforming hydrogen production is input into the carbon dioxide compressor set; carbon monoxide generated in the methanol cracking hydrogen production is combusted to generate high-temperature flue gas, and the high-temperature flue gas provides heat for the expansion of compressed carbon dioxide in the expander set; the carbon dioxide compression provides heat energy for a hydrogen production reaction of methanol, and solar power generation provides electric energy for the hydrogen production of methanol, so that the system energy consumption is reduced, and carbon monoxide is consumed in the system.
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