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Vacuum pressure swing adsorption (VPSA) oxygen enrichment process

A technology of vacuum pressure swing adsorption and oxygen enrichment, which is applied in oxygen preparation, dispersed particle separation, chemical instruments and methods, etc. It can solve the problems of molecular sieve pulverization and uneven air distribution in the tower, so as to improve the adsorption performance and ensure the quality , the effect of high purity

Inactive Publication Date: 2014-07-09
ALLY HI TECH CO LTD +1
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

The above two documents mainly provide an overview of technical solutions, and have not made breakthroughs in the two previous difficulties. There are still problems such as uneven air distribution in the tower and molecular sieve pulverization.

Method used

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  • Vacuum pressure swing adsorption (VPSA) oxygen enrichment process
  • Vacuum pressure swing adsorption (VPSA) oxygen enrichment process

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Embodiment

[0017] Example: such as figure 1 , a vacuum pressure swing adsorption oxygen-enrichment process, the outside air from the air inlet 1 through the blower 2, the heat exchanger 3, and then enters two adsorption towers that work alternately, the adsorption tower absorbs water and carbon dioxide in the air through the adsorbent , nitrogen and hydrocarbons, and the finished product oxygen enters the buffer tank 4, and its basic steps are adsorption, pressure release, vacuum desorption, pressure equalization, and pressure filling.

[0018] Specifically, when producing oxygen-enriched, the cycle step is adopted, the V3 air valve 7 is opened, the outside air passes through the blower 2 and the heat exchanger 3 from the air inlet 1, and then the air is fed from the upper end of the adsorption tower A12 through the blower 2 to pressurize Molecular sieves and activated alumina start to adsorb, and at the same time open the V2 gas valve 6, the vacuum pump 14 starts to work, and the adsorp...

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Abstract

The invention discloses an air separation technology, and particularly relates to a vacuum pressure swing adsorption (VPSA) air separation oxygen enrichment technology. External air passes through a blast blower and a heat exchanger from an air inlet, and then enters two adsorption towers working alternately. The VPSA oxygen enrichment process comprises the following basic steps: adsorption, pressure release, vacuum desorption, pressure balancing and pressurizing. The air inlet is formed above the two adsorption towers, and is used for feeding air upwards and discharging air downwards; the adsorption towers are multi-stage air distributor adsorption towers; an upper airflow distributor is filled with an oxygen-nitrogen separation molecular sieve, and a lower airflow distributor is filled with activated aluminum oxide, so that the molecular sieve inside the tower is not easily screened or jet. Furthermore, a plurality of stages of airflow distributors are arranged inside one adsorption tower, so that even airflow distribution can be facilitated, the adsorption performance is improved, water, carbon dioxide, nitrogen and carbureted hydrogen in air are gradually absorbed, and the oxygen purity is high.

Description

technical field [0001] The invention relates to the technical field of air separation, in particular to a vacuum pressure swing adsorption (VPSA) air separation technology for oxygen enrichment. Background technique [0002] The operation of the VPSA oxygen production process includes two basic steps: intake air adsorption and evacuation desorption, no matter how many towers are used, each adsorption tower must periodically repeat these two steps. The initial pressure swing adsorption unit was small in scale and generally used a two-tower process. Later, in order to expand the scale and save energy consumption, a multi-tower process was developed. With the development of new adsorbents and the progress of equipment manufacturing process, it gradually returns to the two-tower process. This is because when the two-tower process is adopted, when one tower is performing adsorption, the other tower can be evacuated and desorbed, and the two towers are matched to each other, so t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/053C01B13/02
Inventor 魏赣华
Owner ALLY HI TECH CO LTD
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