Carbon capture and compression system based on comprehensive utilization of waste heat and LNG cold energy

By recovering the low-temperature waste heat and liquefied natural gas cold energy from the chemical absorption carbon dioxide capture system, and by using a combination of multiple devices, the problem of insufficient utilization of waste heat and cold energy in existing technologies has been solved, achieving efficient energy utilization and reduced energy consumption.

CN224113652UActive Publication Date: 2026-04-14SOUTH CHINA UNIV OF TECH
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Patent Information

Application Number
CN202520571983.8
Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
Filing Date
2025-03-28
Publication Date
2026-04-14
Estimated Expiration
2035-03-28

AI Technical Summary

Technical Problem

In existing chemical absorption carbon dioxide capture and compression technologies, the waste heat and cold energy of liquefied natural gas are not fully utilized, resulting in low energy utilization efficiency and high energy consumption.

Method used

By integrating the low-temperature waste heat within the system and recovering the cold energy of liquefied natural gas, and using equipment such as flue gas coolers, absorption towers, rich liquid pumps, regeneration towers, reboilers, flash tanks, and flash steam compressors, cogeneration and cascade utilization are achieved, and waste heat from regeneration gas at the top of the regeneration tower, latent heat from lean liquid, and heat of carbon dioxide compression are recovered.

Benefits of technology

It significantly reduces energy consumption in the carbon dioxide capture and compression process, improves the system's energy utilization efficiency and economy, and reduces the number of equipment and the amount of utilities required.

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Abstract

The utility model provides a carbon capture and compression system based on comprehensive utilization of waste heat and LNG (Liquefied Natural Gas) cold energy. The carbon capture and compression system comprises a flue gas cooler, an absorption tower, a rich liquid diverter, a lean and rich liquid heat exchanger, a regenerated gas heat exchanger, a flash steam compressor, a regeneration tower, a reboiler, a two-stage compressor, a multi-stream heat exchanger and a carbon dioxide condenser. A pregnant solution diverter and a regenerated gas heat exchanger are used for recycling waste heat of regenerated gas at the top of the regeneration tower to heat pregnant solution, and sensible heat and latent heat of absorbent regeneration are reduced; the cold energy of liquefied natural gas can be used for liquefying carbon dioxide under intermediate pressure, the compression stage number and compression power consumption of the carbon dioxide are reduced, the multi-stream heat exchanger is used for recovering the compression heat of the carbon dioxide for heating condensate water, the using amount of latent heat and cooling water is further reduced, and the energy consumption is reduced. And full recovery of waste heat in a chemical absorption method carbon dioxide capture and compression system and efficient utilization of liquefied natural gas cold energy are achieved, and the energy utilization efficiency and economical efficiency of the system are improved.
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