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SDN cryogenic air separation unit

2020-09-25 16:30:18
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SDN cryogenic air separation unit
Details:

Technological process

Air compression system: raw air is compressed to 0.7 ~ 0.85mpa by air compressor.

Precooling system: the air is precooled to 5 ~ 10 ° C in the precooling unit, and most of the water is separated.

Purification system: air is adsorbed in the molecular sieve purifier to remove the remaining water, carbon dioxide and hydrocarbons. Air expansion: air expands and cools in the expander to provide the cooling capacity required by the device.

Heat exchange: the air in the main heat exchanger of fractionator exchanges heat with backflow oxygen, nitrogen and sewage nitrogen, and is cooled to

Close to the liquefying temperature and reheat the backflow oxygen, nitrogen and sewage nitrogen to the ambient temperature.

Subcooling: nitrogen is subcooled in the subcooler to the liquid air and liquid nitrogen before throttling.

Distillation: the air is separated by distillation in the distillation column, and the product nitrogen is obtained at the top of the upper column, and the product oxygen is obtained at the bottom of the upper tower.


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