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Separation technique for low pressure oxygen-enriched air

An oxygen-enriched air and low-pressure technology, which is applied in the field of low-pressure oxygen-enriched air separation technology, can solve the problems of high energy consumption and complicated operation for oxygen production, and achieve the effects of low power consumption for oxygen production, simple process flow, and reduced energy consumption

Inactive Publication Date: 2011-10-12
开封黄河空分集团有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In comparison, the product obtained by the low temperature method has high purity, the oxygen purity can reach more than 99.6%, and the nitrogen purity can reach 99.999%. However, the low temperature method requires high energy consumption and complicated operation. You need to add air to adjust the purity
The advantage of the adsorption method is that the process is simple, the operation is convenient, and the operating cost is low, but the purity of oxygen production can only reach 93%, and only one product can be produced

Method used

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  • Separation technique for low pressure oxygen-enriched air
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  • Separation technique for low pressure oxygen-enriched air

Examples

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Effect test

Embodiment 1

[0019] Low-pressure oxygen-enriched air separation process, the steps are: (1) The air is filtered through the filter to remove dust and mechanical impurities, enters the air compressor to compress to 0.33MPa, then cools to 5°C, and continues to be sent to the molecular sieve adsorber for purification; (2) ) The purified air is divided into two paths, one path enters the expansion gas channel of the main heat exchanger of the air fractionation column as expansion air, and then is drawn out from the middle of the main heat exchanger and enters the expander for expansion, and the other path air is cooled to the dew point temperature and passed through oxygen The evaporator enters the lower tower of the air fractionation tower for rectification, and the oxygen-rich liquid air is obtained from the bottom of the lower tower of the air fractionation tower, and nitrogen is obtained from the top of the lower tower of the air fractionation tower; (3) the oxygen-rich liquid air at the bot...

Embodiment 2

[0024] Low-pressure oxygen-enriched air separation process, the steps are: (1) The air is filtered through the filter to remove dust and mechanical impurities, enters the air compressor to compress to 0.38MPa, then cools to 8°C, and continues to be sent to the molecular sieve adsorber for purification; (2) ) The purified air is divided into two paths, one path enters the expansion gas channel of the main heat exchanger of the air fractionation column as expansion air, and then is drawn out from the middle of the main heat exchanger and enters the expander for expansion, and the other path air is cooled to the dew point temperature and passed through oxygen The evaporator enters the lower tower of the air fractionation tower for rectification, and the oxygen-rich liquid air is obtained from the bottom of the lower tower of the air fractionation tower, and nitrogen is obtained from the top of the lower tower of the air fractionation tower; (3) the oxygen-rich liquid air at the bot...

Embodiment 3

[0027] Low-pressure oxygen-enriched air separation process, the steps are: (1) The air is filtered through the filter to remove dust and mechanical impurities, enters the air compressor to compress to 0.44MPa, then cools to 10°C, and continues to be sent to the molecular sieve adsorber for purification; (2) ) The purified air is divided into two paths, one path enters the expansion gas channel of the main heat exchanger of the air fractionation column as expansion air, and then is drawn out from the middle of the main heat exchanger and enters the expander for expansion, and the other path air is cooled to the dew point temperature and passed through oxygen The evaporator enters the lower tower of the air fractionation tower for rectification, and the oxygen-rich liquid air is obtained from the bottom of the lower tower of the air fractionation tower, and nitrogen is obtained from the top of the lower tower of the air fractionation tower; (3) the oxygen-rich liquid air at the bo...

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Abstract

The invention belongs to the field of air separation technology and in particular relates to a separation technique for low pressure oxygen-enriched air, comprising the steps of impurity removal by means of air filtration, compression to 0.33-0.44MPa with an air compressor, purification, heat exchange, rectification, liquid oxygen vaporization and pressurization. The technique has the characteristics of being simple in technological process, convenient in operation, stable and reliable in running, stable in oxygen purity of the product, less in outside interference factors, long in continuous running period, low in power consumption for oxygen generation, low in equipment cost, high in automation degree and convenient in engine start and stop.

Description

technical field [0001] The invention belongs to the technical field of air separation, and in particular relates to a low-pressure oxygen-enriched air separation process. Background technique [0002] Air separation, referred to as air separation, is the process of separating oxygen and nitrogen from the air, or simultaneously extracting rare gases such as helium and argon, by using the different physical properties of the components in the air. It is widely used in metallurgy, chemical industry, petroleum, Machinery, mining, food, military and other industrial sectors. [0003] Modern air separation is realized to produce high-purity oxygen and nitrogen products, generally using two methods: cryogenic method and adsorption method. In comparison, the product obtained by the low temperature method has high purity, the oxygen purity can reach more than 99.6%, and the nitrogen purity can reach 99.999%. However, the low temperature method requires high energy consumption and co...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F25J3/04F25J5/00
Inventor 王好民孙记章刘忠杰赵永奎彭辉
Owner 开封黄河空分集团有限公司
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