Liquid ethylene cooling capacity recycling device

By designing a liquid ethylene cold energy recovery device, utilizing an ethylene-methanol-ethylene glycol heat exchange unit and a methanol-naphtha oil-gas heat exchange unit, the problem of cold energy waste during the vaporization process of liquid ethylene is solved, realizing the recovery and utilization of cold energy and the reduction of steam consumption, which has significant energy-saving and environmental protection benefits.

CN223550941UActive Publication Date: 2025-11-14QINGDAO JINHAISHENG PETROCHEMICAL TECH CO LTD
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Patent Information

Application Number
CN202422844640.2
Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
Filing Date
2024-11-21
Publication Date
2025-11-14
Estimated Expiration
2034-11-21

AI Technical Summary

Technical Problem

The lack of effective liquid ethylene cooling capacity recovery devices in the existing technology leads to serious waste of cooling capacity and excessive steam consumption during the ethylene vaporization process.

Method used

A liquid ethylene cold energy recovery device is designed. Through an ethylene-methanol-ethylene glycol heat exchange unit and a methanol-naphtha oil-gas heat exchange unit, the cold energy released during the vaporization of low-temperature liquid ethylene is used to condense naphtha oil-gas, and the excess cold energy is used to cool the ethylene glycol aqueous solution. Methanol is used as an intermediate refrigerant for recycling.

Benefits of technology

It achieves effective recovery and utilization of cold energy, reduces steam consumption, simplifies the processing, and has significant energy-saving and environmental benefits.

✦ Generated by Eureka AI based on patent content.

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Abstract

The utility model belongs to the technical field of energy recycling, and relates to a liquid ethylene cooling capacity recycling device which comprises an ethylene-methanol-ethylene glycol heat exchange unit and a methanol-naphtha oil gas heat exchange unit, the ethylene-methanol-ethylene glycol heat exchange unit comprises an ethylene-methanol heat exchanger (1), a methanol storage tank (2), a methanol circulating pump (3) and a methanol-ethylene glycol heat exchanger (4), and the methanol-naphtha oil gas heat exchange unit comprises precooling heat exchangers (5-1 and 5-2), cryogenic heat exchangers (6-1 and 6-2), a fan (8) and an oil gas buffer tank (9). According to the cold energy recycling device, cold energy released in the vaporization process of low-temperature liquid ethylene is used for reducing steam consumption and fully utilized, normal vaporization of liquid gas is achieved, a traditional heat source is not needed, naphtha oil gas can be condensed, redundant cold energy is used for cooling an ethylene glycol aqueous solution, the cold energy is effectively recycled, and the production cost is reduced. And the energy-saving effect is remarkable, and the popularization significance is very high.
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