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Liquid air separation plant Integrated Utilisation Project 

Liquid air separation plant Integrated Utilisation Project 
Nov 18, 2025
Author: DEAR AST

The liquid air separation plant uses circulating nitrogen to absorb the cold end of LNG, thus replacing the traditional hot and cold end expanders of the liquid air separation plant. The liquid air separation plant energy consumption is reduced by using glycol aqueous solution closed circuit to absorb the cold at the high temperature end of LNG, thus replacing the traditional cool water tower with lower cooling water temperature and less water consumption. The key of the liquid air separation plant, a low temperature nitrogen press, reduces investment costs while supporting the localisation of this liquid air separation plant and enhancing domestic equipment.

Dear Air Separation creates a corporate brand of high-quality, energy-saving small air separation unit and large air separation unit and liquid air separation plant and constructs an advanced business philosophy and management model.

上海宝冶集团有限公司-7500(2)

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Conventional liquid air separation plants are cooled by isothermal throttling refrigeration and expander refrigeration, LNG cold energy air separation eliminates the need for an expander and utilises the cooling capacity of LNG and isothermal throttling refrigeration. The air separation unit uses circulating nitrogen gas to liquefy into liquid nitrogen in a liquefier, which is fed into the lower tower, where the cold is transferred to the distillation system to pump the dirty liquid nitrogen thr...
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