Method for separating gas in replacement mode
A technology of gas separation and gas replacement, applied in the direction of separation methods, dispersed particle separation, chemical instruments and methods, etc., can solve the problems of product gas loss, take away product gas, reduce product gas production rate, etc., to increase production rate, The effect of high purity
Active Publication Date: 2013-03-20
杭州东安科技有限公司
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Problems solved by technology
[0006] The invention solves the defect that the replacement gas is discharged during the gas separation, resulting in the loss of part of the product gas, and provides a replacement gas that is not emptied and used as a pressurized gas for another adsorption tower, and can also separate and obtain the product gas in the replacement gas , a gas separation method using a displacement method that improves the yield of product gas
[0007] The present invention also solves the defect of taking away the product gas and reducing the product gas yield in the prior art by using countercurrent venting, and provides a replacement gas obtained by using a replacement method and used as a pressurized gas for another adsorption tower, and at the same time A gas separation method using a displacement method that can separate the product gas in the replacement gas and improve the yield of the product gas
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Embodiment
[0019] Embodiment: a kind of gas separation method that adopts displacement mode (see attached figure 1 attached figure 2 ), a total of 6 adsorption towers are combined together to realize cyclic adsorption. Circular adsorption includes 6 processes of adsorption, depressurization, venting, replacement, vacuuming, boosting and pressurizing. This is a cycle, and the above process is repeated after completion. At the same time, each adsorption tower completes a process, taking the adsorption process of the first adsorption tower 1 as an example. At this time, the second adsorption tower 2 is depressurized, the third adsorption tower 3 is emptied, the fourth adsorption tower 4 is replaced, the fifth adsorption tower 5 is vacuumed, and the sixth adsorption tower 6 is boosted and pressurized. The first adsorption tower sequentially completes the processes of adsorption, depressurization, venting, replacement, vacuuming, boosting and charging, and the second adsorption tower sequen...
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The invention discloses a method for separating gas in a replacement mode. In the method, product gas yield is improved by using replacement tail gas. The defects that the replacement tail gas in a gas separation device is discharged so as to lose a part of product gas are overcome; at least six adsorption towers are combined together to realize circular adsorption; in the same time period, each adsorption tower finishes one process, a part of emptying gas is compressed and transferred to the adsorption tower in which gas is needed to be replaced; and after desorption of the adsorption tower, pressure reducing gas discharged in a pressure reducing process and replacement gas discharged in a replacement process are obtained through valve transferring so as to finish a pressure boosting process. High-concentration gas which is used in the replacement process is obtained by compressing emptying gas which is discharged in an emptying gas process, the replacement gas obtained after replacement is used as pressure boosting gas of another adsorption tower, and impurity gas in circulation is fully adsorbed so as to obtain product gas; and yield of product gas is improved.
Description
technical field [0001] The invention relates to a gas separation process, in particular to a gas separation method in a displacement manner which utilizes the displacement tail gas to increase the product gas yield. Background technique [0002] At present, in the existing PSA gas separation technology, whether it is the product obtained from the easy-adsorbed phase, such as PSA to produce pure carbon dioxide, or the product obtained from the difficult-adsorbed phase, such as PSA hydrogen production technology, or it needs to be obtained from Obtaining products from the easily adsorbed phase needs to obtain products from the difficultly adsorbed phase. For example, pressure swing adsorption decarburizes the shift gas from synthetic ammonia for urea production. Inflow, after being adsorbed by the adsorbent inside the adsorption tower, the product flows out from the top of the adsorption tower, or enters the next adsorption tower for concentration purification, or is directly ...
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IPC IPC(8): B01D53/047
Inventor 胡鸿频
Owner 杭州东安科技有限公司