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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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It should contact with the front and rear processes when the piston compressor is ready to stop, we should pay attention to the following sequence: first, cut off the gas supply slowly. In order to prevent the outlet pressure from rising after the gas supply is cut off, open the vent valve at the same time. For the oxygen compressor, the vent valve should be opened slowly, because excessive opening may produce static electricity and cause fire. Then, stop the motor. After the motor stops, turn off the circulating oil pump, grease injector motor and cooling water valve. However, there are also exception cases. For example, in case of emergency shutdown, in order to save time and prevent the accident from expanding, the power supply can be cut off immediately to stop the compressor with load.
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