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SDN cryogenic air separation unit

2020-10-09 10:44:51
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SDN cryogenic air separation unit
Details:

technological process

Air compression system: raw air is compressed to 0.5 ~ 0.9mpa by air compressor.

Pre cooling system: the air is pre cooled to 4 ~ 11 ° C in the pre cooling 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: the air is expanded and cooled in the expander to provide the cooling capacity required by the device.

Heat exchange: the air exchanges heat with the backflow oxygen, nitrogen and sewage nitrogen in the main heat exchanger of the fractionator, and is cooled to the liquefying temperature, and the reflux oxygen, nitrogen and sewage nitrogen are reheated to the ambient temperature.

Supercooling: the liquid air and liquid nitrogen before throttling are subcooled by nitrogen in the subcooler.

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

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