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Modified method of pressure swing adsorption

A pressure swing adsorption and adsorption bed technology, applied in the field of pressure swing adsorption, can solve the problems affecting the production efficiency and product gas recovery rate of the multi-bed pressure swing adsorption process, the increase of investment in the pressure swing adsorption system, and the increase of the pressure swing adsorption system. To achieve the effect of shortening cycle time, long pressure equalization times and reducing investment

Inactive Publication Date: 2004-05-26
李群柱
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  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The multi-bed pressure swing adsorption method proposed by this method adopts a single-bed-to-single-bed flushing process, that is, the gas discharged from one adsorption bed in the forward depressurization process only provides flushing gas for the other adsorption bed, thus affecting the multi-bed pressure swing adsorption process. Production efficiency and product gas recovery of the adsorption process
To increase the pressure equalization times to increase the product gas recovery rate, it is necessary to increase the number of adsorption beds in the pressure swing adsorption system or reduce the time of reverse flushing, which will lead to an increase in investment in the pressure swing adsorption system or a decrease in the high product gas recovery rate.

Method used

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Examples

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example 1

[0077] In this example, for a hydrogen production capacity of 50000Nm 3 / h Industrial hydrogen shift gas pressure swing adsorption hydrogen purification device, the adsorption pressure is 2.4Mpa, the adsorption temperature is normal temperature, and the desorption pressure is 0.03Mpa. The molar composition of the feed gas is: hydrogen, 70.2%, carbon monoxide, 3%, carbon dioxide, 21.3%, methane, 5.5%, water, saturated, and the purity of the product hydrogen is greater than 99.9%. The adsorbent that adopts is molecular sieve commonly used in industry, gac, silica gel, respectively adopts 10 bed pressure swing adsorption techniques (process 1) of the known technology described in Fig. 1 and 10 bed pressure swing adsorption of the present invention described in Fig. 2 Technology (process 2), 10-bed pressure swing adsorption process (process 3) of the present invention described in Fig. 4, 10-bed pressure swing adsorption process (process 2) and (process 3) of the present invention ...

example 2

[0080] In this example, for a hydrogen production capacity of 15000Nm 3 The shift gas pressure swing adsorption hydrogen purification device of / h industrial hydrogen, operating conditions, feed gas composition and adsorbent are all identical with example 1, respectively adopt the 10-bed pressure swing adsorption process (process 1) of known technology described in Fig. 1 And 6 bed pressure swing adsorption techniques (process 4) of the present invention described in Fig. 9, 7 bed pressure swing adsorption techniques (process 5) of the present invention described in Fig. 10, 6 bed pressure swing adsorption techniques (processes) of the present invention 4) and the 7-bed pressure swing adsorption process (process 5) did not use auxiliary pressure equalization, and their technical comparisons are shown in Table 2:

[0081] project

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PUM

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Abstract

An improved variable-pressure adsorption method features that at least 4 adsorptive beds are used, and its adsorption-regeneration cycle process is composed of adsorption, pressure equalizing and lowering multiple times, forward discharge, backward discharge, counter-current flushing, pressure equalizing and raising multiple times, and finally raising the pressure. The gas discharged in forward discharge of one adsorptive bed can be used as the counter-current flushing gas for another two adsorptive beds. In the final counter-current flushing step, the gas discharged in the forward discharge of one adsorptive bed can be used as flushing gas and pressure raising gas of one adsorptive bed and as the flushing gas of another one.

Description

technical field [0001] The invention belongs to the technical field of adsorption separation, and more specifically relates to a pressure swing adsorption (PSA) method for separating or purifying gas components from various gas mixtures. Background technique [0002] As an important branch of the adsorption separation process, pressure swing adsorption (PSA for short) is mainly used for the separation and purification of various industrial gas mixtures. For example, it is used to remove light hydrocarbons, nitrogen, carbon monoxide, carbon dioxide, etc. from various hydrogen-containing mixed gases to produce pure hydrogen gas with weak adsorption capacity (purity is usually greater than 98%), which is used in petroleum and chemical industries. Various hydrogenation processes and industrial fields such as metallurgy and electronics. On the other hand, it can also be used to recover gases with strong adsorption capacity such as ethylene, carbon monoxide, carbon dioxide, etc. ...

Claims

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Application Information

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IPC IPC(8): B01D53/047
Inventor 李群柱
Owner 李群柱
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