Process for enriching oxygen in air by two-stage pressure swing adsorption

A technology of pressure swing adsorption and air, which is applied in separation methods, chemical instruments and methods, products, etc., and can solve the problems of high power consumption and investment, short cycle time, and low oxygen recovery rate of oxygen generators

Inactive Publication Date: 2002-12-25
CHENGDU TIANLI CHEM ENG TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For example, when producing oxygen-enriched gas with an oxygen concentration greater than 93% (V), the oxygen concentration at the outlet of the adsorption tower is greater than 60% (V) before desorption and venting, and the cycle time of the pressure swing adsorption oxygen generator is extremely short , so the oxygen recovery rate is very low, no more than 50% (V), which makes the power consumption and investment of the entire oxygen plant very high

Method used

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  • Process for enriching oxygen in air by two-stage pressure swing adsorption
  • Process for enriching oxygen in air by two-stage pressure swing adsorption
  • Process for enriching oxygen in air by two-stage pressure swing adsorption

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051] The feed gas in this example is air. The oxygen concentration in the outlet gas of the adsorption tower in the adsorption step of the first stage pressure swing adsorption device is controlled at 21 to 23% (V), and the oxygen concentration in the outlet gas of the adsorption tower in the adsorption step of the second stage pressure swing adsorption device is controlled at 93% (V) around (that is, the product is oxygen-enriched).

[0052] Component

O 2

N 2

Ar

CO 2

other

∑

Concentration (%) (V)

20.93

78.03

0.932

0.03

0.078

100

[0053] Temperature: ≤45℃

[0054] Pressure: 0.018MPa(G)

[0055] As shown in Figure 1, there are three adsorption towers A to C in total to form the first-stage pressure swing adsorption device, and there is also one vacuum buffer tank V4 and one pressure equalization buffer tank V2. The adsorbents loaded in the adsorption tower from bo...

Embodiment 2

[0085] The feed gas in this example is air. The oxygen concentration in the outlet gas of the adsorption tower in the adsorption step of the first stage pressure swing adsorption device is controlled at 45-50% (V), and the oxygen concentration in the outlet gas of the adsorption tower in the adsorption step of the second stage pressure swing adsorption device is controlled at 93% (V) around (that is, the product is oxygen-enriched).

[0086] The process flow chart of this embodiment, the operating program table of the process steps of the first-stage pressure swing adsorption device, and the operating program table of the process steps of the second-stage pressure swing adsorption device are the same as those of Embodiment 1.

[0087] Component

O 2

N 2

Ar

CO 2

other

∑

Concentration (%) (V)

20.93

78.03

0.932

0.03

0.078

100

[0088] As shown in Figure 1, there are three ads...

Embodiment 3

[0093] The feed gas in this example is air. The oxygen concentration in the outlet gas of the adsorption tower in the adsorption step of the first stage pressure swing adsorption device is controlled at 75-80% (V), and the oxygen concentration in the outlet gas of the adsorption tower in the adsorption step of the second stage pressure swing adsorption device is controlled at 93% (V) around (that is, the product is oxygen-enriched).

[0094] The process flow chart of this embodiment, the operating program table of the process steps of the first-stage pressure swing adsorption device, and the operating program table of the process steps of the second-stage pressure swing adsorption device are the same as those of Embodiment 1.

[0095] Component

O 2

N 2

Ar

CO 2

other

∑

Concentration (%) (V)

20.93

78.03

0.932

0.03

0.078

100

[0096] Temperature: ≤45℃

[0097] Pressure: 0.018MPa(G) ...

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Abstract

A process for preparing oxygen-enriched air from ordinary air uses two pressure swing adsorption zones which are serially connected. Each of two adsorption zones is parallelly connected with two or more adsorption towers. The first adsorption zone is used for removing water, CO2 and part of nitrogen to increase the concentration of oxygen to 21-80 V%. The second one is used for removing the rest of nitrogen to increase the concentration of oxygen to 30-95 V%. It is characterized by that the process steps of each adsorption tower are staggered.

Description

technical field [0001] The invention relates to a method for producing oxygen enrichment by using air as a raw material, in particular to a method for producing oxygen enrichment from air by adopting two-stage pressure swing adsorption technology. Background technique [0002] At present, there are no published patent documents and data reports at home and abroad on the method of producing oxygen-enriched air from air by using two-stage pressure swing adsorption technology. The prior art all adopts a set of pressure swing adsorption device to produce oxygen-rich from the air, such as Chinese Patent Publication No. CN1035993A, CN1200949A, CN1252322A etc. all adopt a set of pressure swing adsorption device to produce oxygen-rich from the air, the adsorption tower of the prior art Before desorption and venting, the oxygen concentration is higher. For example, when producing oxygen-enriched gas with an oxygen concentration greater than 93% (V), the oxygen concentration at the o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/047B01D53/053C01B13/02
CPCY02C20/40Y02P20/151
Inventor 宋宇文
Owner CHENGDU TIANLI CHEM ENG TECH
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