Separation technique for low pressure oxygen-enriched air

Separation technique for low pressure oxygen-enriched air

  • CN 102,213,537 A
  • Filed: 04/18/2011
  • Published: 10/12/2011
  • Est. Priority Date: 04/18/2011
  • Status: Active Application
First Claim
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1. low pressure oxygen-enriched air separating technology the steps include:

  • that (1) air through the filter filtering and impurity removing, enters air compressor machine and is compressed to 0.33-0.44MPa, is cooled to 5-10 ℃

    then, continues to be fed into molecular sieve adsorber and purifies;

    (2) cleaned air passes is divided two-way, one the tunnel enters the empty expansion gas passage that divides the fractionating column main heat exchanger as expanded air, extract out by the main heat exchanger middle part then and enter the decompressor expansion, another road air directly is cooled to dew-point temperature through main heat exchanger, continuation is through dividing tower rectifying under the fractionating column through entering sky behind the oxygen evaporator again, tower bottom obtains oxygen-enriched liquid air under the empty branch fractionating column, and top of tower obtains nitrogen under the empty branch fractionating column;

    (3) air crossed after expanding with decompressor in cold back of the empty oxygen-enriched liquid air that divides tower bottom under the fractionating column enters the empty tower rectifying on the fractionating column that divides, and emptyly divides that top of tower obtains nitrogen on the fractionating column;

    (4) emptyly divide tower bottom obtains on the fractionating column liquid oxygen to enter oxygen evaporator to be vaporized from the air heat of main heat exchanger, oxygen pressure is increased to 65-80KPa, and supercharging obtains oxygen product after the main heat exchanger re-heat.

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