Process for improving gas reclaiming rate of pressure swing absorption separation process

A technology of pressure swing adsorption and separation method, which is applied in the direction of separation method, dispersed particle separation, chemical instruments and methods, etc., which can solve the problems of increased production cost, increased equipment energy consumption, waste of tail gas, etc., and achieves the reduction of operating energy consumption and production Cost, increase in extraction recovery rate, effect of waste reduction

Active Publication Date: 2008-01-30
上海瑞气气体科技有限公司
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  • Application Information

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Problems solved by technology

The general PSA process directly vents the tail gas, and the part of the tail gas with recovery value is all wasted, so that the gas extraction recovery rate of the PSA process is low, and the pressure energy in the tail gas cannot be fully utilized after emptying, which increases the energy consumption of the equipment. increase production costs

Method used

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  • Process for improving gas reclaiming rate of pressure swing absorption separation process

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Embodiment

[0010] Embodiment: As shown in the figure, the process of the present invention can be applicable to the PSA process of various gases, including the PSA separation method of various two-tower, three-tower or more tower formations. This embodiment adopts a two-tower type PSA separation method, extracting nitrogen from compressed air.

[0011] When adsorption towers A and B are switched to regenerate, the tail gas is discharged. If the recovery value is not large, close the control valve V1, open the control valve V2, and directly vent. If recovery is required, close the control valve V2, open the control valve V1, and recycle the exhaust gas into the exhaust gas recovery tower for accumulation, then pressurize it through the booster and send it back into the raw material gas intake pipeline for recycling. Of course, the stored tail gas can also be directly sent to the raw material gas supply source without pressurization, and then compressed and sent together after mixing.

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Abstract

The invention relates the technology of improving the gas recovery ratio with pressure swing adsorptive separation method, comprising the following steps: the adsorption tower carried out adsorption and regeneration by turns, evacuating the tail gas through blowdown pipe, according to control the switch, recovering the tail gas. The invention uses the parts of tail gas as raw gas to enter PSA flow path, so the recovery ratio of product gas is improved, the waste is reduced, and the energy consumption and cost are decreased.

Description

Technical field: [0001] The invention relates to a pressure swing adsorption gas separation process. Background technique: [0002] Pressure swing adsorption separation method is commonly used to separate gas, that is, PSA process. In the operation of the technological process, the process of cycle switching makes each adsorption tower adsorb and regenerate requires a large amount of tail gas to be evacuated and pressure relieved. There are more product gas components in the tail gas, especially the use of product gas to regenerate the molecular sieve of the adsorption tower. In the tail gas, the concentration of part of the product gas is higher than that of the raw material gas. The general PSA process directly vents the tail gas, and the part of the tail gas with recovery value is all wasted, so that the gas extraction recovery rate of the PSA process is low, and the pressure energy in the tail gas cannot be fully utilized after emptying, which increases the energy consu...

Claims

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Application Information

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IPC IPC(8): B01D53/047
Inventor张军赵宏海吴天瑞丛希奎蔡元培
Owner上海瑞气气体科技有限公司