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Device and method for producing high purity oxygen by pressure swing adsorption

A pressure swing adsorption, high-purity technology, applied in chemical instruments and methods, oxygen preparation, separation methods, etc., can solve the problems of no industrial application, low adsorption selectivity, and low separation efficiency, so as to save energy and improve oxygen Purity, the effect of improving purity

Pending Publication Date: 2019-01-11
DALIAN LEADER GAS SEPARATION TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the low adsorption selectivity of oxygen and argon based on equilibrium adsorption, the two-stage pressure swing adsorption system prepared by this type of high-purity oxygen has the disadvantages of low separation efficiency and high energy consumption, and its application is limited. The disclosed technology has not yet been related. industrial applications

Method used

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  • Device and method for producing high purity oxygen by pressure swing adsorption
  • Device and method for producing high purity oxygen by pressure swing adsorption
  • Device and method for producing high purity oxygen by pressure swing adsorption

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Embodiment 1

[0032] In order to improve the total recovery rate of oxygen and the purity of product oxygen, the present invention improves the existing two-stage series pressure swing adsorption oxygen production technology, and proposes a device and method for preparing high-purity oxygen by pressure swing adsorption.

[0033] Such as figure 1 As shown, a method for preparing high-purity oxygen by pressure swing adsorption includes a two-stage pressure swing adsorption system. The first stage pressure swing adsorption system is based on the adsorbent of the equilibrium adsorption mechanism to separate nitrogen from the pretreated compressed air. Adsorbents based on the equilibrium adsorption mechanism of the primary pressure swing adsorption system include, but are not limited to, combinations of two or more of 5A, 10X, 13X and LiLSX zeolite molecular sieve adsorbents. The nitrogen in the air is selectively adsorbed by the adsorbent bed to produce the primary product gas containing oxygen...

Embodiment 2

[0060] Such as figure 2 As shown, the two adsorption towers T1A and T1B of the first-stage pressure swing adsorption system are filled with the same zeolite molecular sieve adsorbent of a certain domestic brand, each 300kg, and the two adsorption towers T2A and T2B of the second-stage pressure swing adsorption system are respectively filled with The same carbon molecular sieve adsorbent of a certain domestic brand is 40kg each. The air compressor compresses the air to a gauge pressure of 0.5MPa. The two-stage pressure swing adsorption system operates according to the cycle steps described in Table 1 and Table 2 respectively. The first and sixth stages of the pressure swing adsorption cycle of the second stage pressure swing adsorption system The initial gas production stage of step (see Table 2) flows into the gas storage tank G2 and the collection time is 2 seconds, and the argon-rich tail gas in steps 3 and 8 (see Table 2) The collection time is 8 seconds. The output of t...

Embodiment 3

[0062]Compared with Example 2, the steps and operating methods in this example, except the initial gas production stage of steps 1 and 6 (see Table 2) in the pressure swing adsorption cycle of the second stage pressure swing adsorption system, flow into the gas storage tank G2 collection time is shortened to 1 second, and the argon-rich tail gas collection time of the 3rd and 8th step (see Table 2) in the pressure swing adsorption cycle of the second-stage pressure swing adsorption system is all outside 6 seconds, and all the other steps are the same as in Example 2 same. The output of the primary product gas produced by the first stage pressure swing adsorption system is 16.4m3 / h, the oxygen purity is 94.3%, the oxygen recovery rate of the first stage pressure swing adsorption system is 40.1%, and the final stage of the second stage pressure swing adsorption system is The output of product gas is 11.3m3 / h, the oxygen purity is 99.0%, the oxygen recovery rate of the second-sta...

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Abstract

The invention relates to a device and method for producing high purity oxygen by pressure swing adsorption. The method improves the existing two-stage pressure swing adsorption oxygen generation technology, uses the argon-rich tail gas discharged from a second-stage pressure swing adsorption system as first-stage cleaning gas of an adsorption tower of a first-stage pressure swing adsorption system, utilizes low-oxygen product gas produced by in the initial stage after second-stage pressure swing adsorption system-based separation purification as third-stage cleaning gas in the last cleaning stage, improves the concentration of primary oxygen product gas produced by the first-stage pressure swing adsorption system, improves the recovery rate of the oxygen product in the whole system and reduces the energy consumption. The product gas of the second-stage pressure swing adsorption system is analyzed and separated in initial, middle and late stages. The product gas in the middle stage is used as final product gas so that the purity of oxygen is further improved and the oxygen purity of the final product gas is kept to 99.0% and even 99.7% or more.

Description

technical field [0001] The invention belongs to the technical field of gas separation, and relates to the technology of separating and preparing high-purity oxygen from air by means of pressure swing adsorption technology, in particular to a pressure swing adsorption based on equilibrium selective adsorption and kinetic selective adsorption separation mechanism to prepare high-purity oxygen Oxygen apparatus and methods. Background technique [0002] Oxygen is widely used as an industrial gas, and the demand is also increasing. It is widely used in metallurgy and chemical industry, and is also widely used in energy saving and environmental protection fields, such as garbage incineration, industrial combustion, sewage treatment and so on. The traditional oxygen production method is the cryogenic method, but it is expensive, occupies a large space, has a complicated process and high energy consumption, and is suitable for large-scale oxygen production. Pressure swing adsorptio...

Claims

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Application Information

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IPC IPC(8): C01B13/02B01D53/047
CPCB01D53/047B01D2256/18B01D2259/40022C01B13/0266C01B13/027C01B2210/0017C01B2210/0018C01P2006/80
Inventor 石军雄潘广通李安武李攀
Owner DALIAN LEADER GAS SEPARATION TECH
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