Process for producing rich oxygen by VPSA (vacuum pressure swing adsorption) air separation

An air separation and oxygen enrichment technology, which can be used in oxygen preparation, separation methods, and dispersed particle separation, and can solve problems such as high energy consumption.

Active Publication Date: 2013-09-11
成都华西工业气体有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the evaporation of a large amount of water during the working process of the water ring vacuum pump, the VPSA system still has high energy consumption

Method used

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  • Process for producing rich oxygen by VPSA (vacuum pressure swing adsorption) air separation
  • Process for producing rich oxygen by VPSA (vacuum pressure swing adsorption) air separation

Examples

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Embodiment 1

[0020] In a two-tower group VPSA air separation system for oxygen enrichment, taking the tower group composed of towers TA1 and TB1 as an example, the process flow is described as follows:

[0021] (1) Adsorption (A): Open the valves VA1, VA3, VA6, V7, the air enters the tower TA1 from the bottom of the tower, and in the tower TA1, the H in the air 2 O.CO 2 It is successively removed by activated alumina and 13X molecular sieve. Then through valve VA3, it enters TB1 from the bottom. In tower TB1, N2 is adsorbed and removed by oxygen-nitrogen separation molecular sieve, and the formed oxygen-enriched product gas is sent to product gas buffer tank V through valves VA6 and V7. When reaching a specific position in the reserved section of the outlet of the adsorption bed, close the valves VA1, V7, and VA3 to stop the adsorption.

[0022] (2) Parallel pressure equalization and depressurization of the upper and lower towers of the tower group (TAED, TBED): open valves VB6 and VA5, ...

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Abstract

The invention provides a process for producing rich oxygen by vacuum pressure swing adsorption (VPSA) air separation. The VPSA oxygen producing system provided by the invention mainly comprises two or more absorption tower groups, vacuum pumps, valves and pipes, wherein each absorption tower group is formed by connecting an upper absorption tower and a lower absorption tower through pipes and valves, the lower tower of the absorption tower group is filled with activated aluminum oxide and a 13X molecular sieve, and the upper tower of the absorption tower group is filled with oxygen / nitrogen-separation molecular sieve type absorbent. The bottom of the upper tower of the absorption tower group is connected to one vacuum pump by the pipes and valves, and the bottom of the lower tower is connected to the other vacuum pump by the pipes and valves. The process for producing rich oxygen by VPSA comprises the following steps in sequence: (1) absorbing; (2) concurrently equalizing and reducing the pressure in the upper and lower towers of each absorption tower group; (3) concurrently extracting the upper and lower towers of each absorption tower group to vacuum; (4) concurrently equalizing and boosting the pressure in the upper and lower towers of each absorption tower group; and (5) boosting the pressure. In the invention, since the absorption tower groups, multiple vacuum systems and the steps of the process of producing rich oxygen by VPSA air separation are adopted, the energy consumption of the oxygen producing system can be reduced by 12-17% and the oxygen absorption rate can be increased by 2-5%, as compared with those of the conventional process for producing rich oxygen by VPSA.

Description

technical field [0001] The invention relates to a method for separating and enriching oxygen from air by vacuum pressure swing adsorption (VPSA), which belongs to the field of gas separation. Background technique [0002] Oxygen is an important raw material for industry and is widely used in metallurgy, chemical industry, electric power, fertilizer, glass, water treatment, non-ferrous metal smelting and medical treatment. The pressure swing adsorption oxygen production process has the advantages of simple process, safety, low investment, low energy consumption, high degree of automation, convenient and quick start and stop, short start-up time, and strong adaptability. The oxygen production process is completed at normal temperature and pressure, and the oxygen purity is 50 It can be adjusted arbitrarily between %~95%, and the load can be changed arbitrarily within the range of 30%~110%. Since the 1980s, with the maturity of the pressure swing adsorption method to separate ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D53/047C01B13/02
Inventor 杨炯良郎治
Owner 成都华西工业气体有限公司
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