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Methods of obtaining liquid nitrogen

Time: 2020-09-22 10:44 Source: unknown Author: Bander liquid nitrogen tank Click: second
How to get liquid nitrogen? By compressing and cooling the air, separating the air and other gases, nitrogen is left.   liquid nitrogen tank

An air separation system for obtaining liquid oxygen and liquid nitrogen comprises at least one air separation device mainly composed of fractionating tower and at least one LNG cold capacity recovery device mainly composed of LNG heat exchanger. The air separation device is also equipped with a main heat exchanger, a liquid oxygen heat exchanger and a liquid nitrogen liquid air subcooler;

Oxygen is drawn from the lower part of the upper fractionation tower of the fractionation tower, and is cooled and liquefied in the liquid oxygen heat exchanger as the liquid oxygen product; after being reheated by the liquid nitrogen liquid air subcooler and the main heat exchanger, at least part of the nitrogen from the top of the fractionation tower enters the LNG heat exchanger for precooling and heat exchange to high-pressure nitrogen after throttling and expansion After that, through the gas-liquid separator, nitrogen and some liquid nitrogen participate in the nitrogen circulation, and the rest liquid nitrogen is used as liquid nitrogen products;

After actual use, the energy consumption is significantly reduced, and the power consumption of producing 1kg liquid oxygen is 0.39kwh, while that of the traditional air separation device of the same scale for producing 1kg liquid oxygen is 1.0-1.25kwh, which is 2.4-3 times of the unit power consumption of the air separation device proposed in the invention, which is convenient for popularization and application. liquid nitrogen tank

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