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Pressure swing adsorption continuous oxygen generation method

A technology of pressure swing adsorption and adsorption tower, which is applied in separation methods, chemical instruments and methods, and oxygen preparation, etc. It can solve the problems of low efficiency of use of adsorbents, large investment in equipment construction, and high energy consumption of oxygen production equipment. Improve the recovery rate and oxygen production capacity, improve the utilization rate, and increase the oxygen content

Inactive Publication Date: 2007-03-07
印全彬
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This is the main reason for the high energy consumption of the pressure swing adsorption air separation oxygen plant and the high cost of the oxygen produced.
[0003] The CN1142006C patent discloses a method for producing oxygen-enriched air from air using two-stage pressure swing adsorption technology, which can increase the recovery rate of oxygen. However, due to the adoption of two-stage series adsorption, more than four adsorption towers and intermediate buffer tanks are required, and there is a process Complicated, many program-controlled valves, large investment in equipment construction, and the use efficiency of the adsorbent is not high because the adsorbent in the second-stage adsorption tower cannot fully absorb nitrogen

Method used

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  • Pressure swing adsorption continuous oxygen generation method
  • Pressure swing adsorption continuous oxygen generation method
  • Pressure swing adsorption continuous oxygen generation method

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Experimental program
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Effect test

Embodiment 1

[0063] Raw material air temperature: ≤40℃

[0064] Raw material air pressure: 0.00Mpa, adsorption tower adsorption step pressure -0.02Mpa.

[0065] Vacuum desorption final adsorption tower pressure: -0.09Mpa

[0066] The pressure swing adsorption air separation oxygen plant of the present invention consists of 3 adsorption towers filled with activated alumina and molecular sieve adsorbent, 1 product oxygen buffer tank, 1 product nitrogen buffer tank and corresponding pipelines, program-controlled valves and vacuum pumps, Oxygen compressor composition. The raw air is sucked into the device by the product oxygen compressor, and enters the adsorption tower A from bottom to top through the program-controlled valve KV1A. The upper end of the bed enters the adsorption tower B through the program-controlled valve KV5A and the pipeline, and the nitrogen in the rich oxygen is further adsorbed by the molecular sieve in the adsorption tower B, and the product oxygen with an oxyg...

Embodiment 2

[0069] Raw material air temperature: ≤40℃

[0070] Raw material air pressure: 0.02Mpa

[0071] Vacuum desorption final adsorption tower pressure: -0.06Mpa

[0072] The pressure swing adsorption air separation oxygen plant of the present invention consists of 3 adsorption towers filled with activated alumina and sieve adsorbent, 1 product oxygen buffer tank, 1 product nitrogen buffer tank, 1 vacuum tank and corresponding It consists of pipelines, program-controlled valves and vacuum pumps. The compressed air of 0.02Mpa enters the device and enters the adsorption tower A from bottom to top through the program-controlled valve KV1A. The water in the air is adsorbed by the activated alumina filled in the adsorption bed, the nitrogen in the air is adsorbed by molecular sieves, and the rich oxygen flows from the top of the adsorption bed. Enter the adsorption tower B through the program-controlled valve KV5A and the pipeline, the nitrogen in the rich oxygen is further adsor...

Embodiment 3

[0075] Raw material air temperature: ≤45℃

[0076] Raw material air pressure: 0.04Mpa

[0077] Vacuum desorption final adsorption tower pressure: -0.04Mpa

[0078] The pressure swing adsorption air separation oxygen plant of the present invention consists of three adsorption towers filled with activated alumina and molecular sieve adsorbents, one product oxygen buffer tank, one product nitrogen buffer tank, and corresponding pipelines, program-controlled valves and vacuum pumps. . The compressed air of 0.02Mpa enters the device and enters the adsorption tower A from bottom to top through the program-controlled valve KV1A. The water in the air is adsorbed by the activated alumina filled in the adsorption bed, the nitrogen in the air is adsorbed by molecular sieves, and the rich oxygen flows from the top of the adsorption bed. Enter the adsorption tower B through the program-controlled valve KV5A and the pipeline, the nitrogen in the rich oxygen is further adsorbed by t...

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Abstract

The invention discloses a method for continuous production oxygen and nitrogen by air as the raw material through pressure swing adsorption, the pressure swing adsorption system includes at least three adsorption columns filled with adsorbents selected from one or more from 13X molecular sieve, 5A molecular sieve, lithium sieve, other oxygen-producing molecular sieve and activated alumina. The method comprises the following steps, entering the raw material air into adsorption column A, completing an adsorption step 2, entering the produced oxygen-enriched air into adsorption column B for second adsorption, thus completing an adsorption step 1, then automatically switching the system to the adsorption step 2, entering pressure reduction equalizing step, desorption step, pressure raising equalizing step, pressurizing step and pressure equalizing step, finally entering the adsorption step 1 again, circulating continuously to obtain the product of oxygen and nitrogen.

Description

technical field [0001] The invention relates to the technical field of pressure swing adsorption air separation, in particular to a method for preparing oxygen by using air as a raw material and using pressure swing adsorption technology. Background technique [0002] The existing pressure swing adsorption air separation and oxygen production equipment adopts one-step adsorption no matter whether it adopts vacuum desorption process or high-pressure process; when producing oxygen with higher purity, in order to ensure the purity of oxygen, the adsorbent is not enough. When nitrogen is adsorbed, switch out of the adsorption step and enter the pressure equalization or evacuation or reverse discharge step, resulting in a low oxygen recovery rate. For the vacuum process with a high oxygen recovery rate, when producing oxygen with a purity of 93%, the oxygen recovery rate is only 40%. ~60%. When producing 93% pure oxygen in the reverse flow process of oxyg...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B13/02B01D53/047
Inventor 印全彬
Owner 印全彬