CN1063351C - Method for increasing equalizing frequency in process of pressure-swing adsorption - Google Patents

Method for increasing equalizing frequency in process of pressure-swing adsorption Download PDF

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CN1063351C
CN1063351C CN 93111987 CN93111987A CN1063351C CN 1063351 C CN1063351 C CN 1063351C CN 93111987 CN93111987 CN 93111987 CN 93111987 A CN93111987 A CN 93111987A CN 1063351 C CN1063351 C CN 1063351C
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tower
flow processs
flow
towers
pressure
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CN1085119A (en
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黄家鹄
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Abstract

The present invention provides a pressure-variable adsorption method for expanding and improving the frequency of pressure equalizing in systems which are arranged in a tower 5 and towers higher than the tower 5. The total number of the towers is N in the systems, and a procedure is operated according to the frequency that m is less than or equal to N-n-1 of the pressure equalizing except for the traditional frequency of the pressure equalizing under the condition that the number of the towers simultaneously operated in a pressurized and adsorbed mode is n.

Description

Improve the method for all pressing number of times in the pressure-swing absorption process
What the present invention relates to is a kind of method of carrying out gas separation and purifying with the transformation suction type.
Transformation absorption (PSA) method is the advanced method that is used to separate with purified gases, is to make admixture of gas pass through the process of the adsorption and desorption of adsorbent in the variation realization of different pressures condition and the tower.The scope of application of this method is very wide, for example has been widely used in gas products such as separation and purified hydrogen, nitrogen, carbon monoxide, carbon dioxide at present.
Generally speaking, in the PSA method, when other condition one timing, the purity of product gas and yield are conflicting.Be purity and the yield that improves product gas simultaneously, form under the constant situation in systems such as total tower number and adsorbent types, all pressures number of times in the raising system as much as possible between each tower is a kind of effective method, so that can reclaim the product gas component in the bed dead space more.But to allowing actually in the PSA system of a certain specific composition to realize that how many times all presses, so that performance its potentiality in fullest ground are still just being undertaken at present by rule of thumb and by traditional habit.As in 5 present Tower Systems, have only single tower to make 2 equal baric flow journeys (being called for short 512 flow processs) under the pressurising absorption; Have only double tower to make 2 equal baric flow journeys (being called for short 622 flow processs) under the pressurising absorption simultaneously in 6 Tower Systems at present; Have only 3 the equal baric flow journeys (being called for short 823 flow processs) under the double tower pressurising simultaneously absorption in 8 Tower Systems at present; 3 equal baric flow journeys having only double tower pressurising simultaneously absorption in 10 Tower Systems at present; 4 limited several workflows such as equal baric flow journey under the three towers pressurising simultaneously absorption are also only arranged in 12 Tower Systems.With United States Patent (USP) 4726816 is example, in the improvement PSA of its introduction method, once relates to the work system of 4 towers, 5 towers and 6 towers, and what adopt all is traditional flow process of all pressing for 2 times but each system is actual, that is, only be respectively 412,512 and 612 flow processs.
Though the research to pressure swing absorption process with the present established common recognition of practice is, the number of times of all pressing that improves in the flow process can improve the yield of product or/and purity, but at present except that to 4 towers and but to be less than the few and excursion of the system Yin Qita number of 4 towers little by the abundant research, for in 5 towers and the absorption of the transformation more than 5 towers work system, when total tower number and carry out simultaneously under the fixed condition of work tower number of pressurising absorption, except that the flow process of all pressing number of times to carry out by above-mentioned tradition, according to product purity or/and the different requirements of yield, it is suitable or best how to select to determine, or the highest accessible flow process of all pressing number of times, be the problem that waits to solve.The task that this is also proposed by the invention just and solved.
The method that the present invention proposes is to be in 5 towers or the absorption of the transformation more than 5 towers work system at total tower number N, when the work tower number that carries out pressurising absorption simultaneously is n, except that the workflow of all pressing number of times to carry out by tradition, can also all press the flow process of number of times to carry out according to m≤N-n-1, wherein m all presses alternative number of times of all pressing in the number of times scope for can reach in this work system the highest or the highest.For example, in 5 Tower Systems (N=5), when the tower number that adsorbs work simultaneously was single tower (n=1) or double tower (n=2), its highest number of times of all pressing can reach 3 times (m=3) and 2 times (m=2) respectively, and this PSA flow process can abbreviate 513 flow processs and 522 flow processs respectively as.Be example with 5 related in above-mentioned United States Patent (USP) towers and 6 Tower Systems still, 5 Tower Systems also can be selected in 513 above-mentioned flow processs and 522 flow processs except that its used tradition 512 flow processs; 6 Tower Systems can also be selected in workflows such as 613 flow processs, 614 flow processs, 622 flow processs, 623 flow processs and 632 flow processs by the inventive method except that 612 flow processs of its usefulness.Obviously, actual conditions according to each work system reach product yield or/and the different specific requirements of purity, this forwarding method can provide bigger range of choice, and determines the highest number of times of all pressing that can reach, and is beneficial to select and determine suitable or best PSAT and makes flow process.All pressing the change of number of times all is fairly obvious to the influence of product yield still to product purity, for example, when product purity is identical, all presses number of times to bring up to 3 times from 2 times, and product yield generally can improve 5～10%.With the PSA recover hydrogen is example, and when product purity required to be 99%, the product yield when adopting 512 flow processs was 75%, adopt 513 flow processs after, yield can be increased to 80%.On the other hand, when requiring product yield to be 75%, the purity of product hydrogen is 99% in 512 flow processs, and after adopting 513 flow processs, purity can rise to 99.9%.This shows that the inventive method improving far reaching significance and the value that is had on the PSA method.
Below, only limit to following each routine scope but should not be construed as the inventive method with the concrete utilization of some example explanations said method of the present invention.
In described each example, A is the pressurising adsorption process, EnD (n=1,2,3,) be the n time step-down pressure equalizing, EnR (n=1,2,3 ...) be the n time pressurising pressure equalizing, P is that wash between tower suitable let slip journey, and PP is for letting slip journey outward, and PD is the reverse pressure process of putting, and FR is for filling process eventually.In the digital code of each flow process, from right-to-left, first bit digital is all pressures number of times (m) in this flow process, second-order digit is for carrying out the work tower number (n) of pressurising adsorption process simultaneously in this flow process, the 3rd bit digital is the total tower number (N) of system in this flow process, as: 513 flow processs are that single tower is made the flow process that pressurising absorption is all pressed for 3 times in 5 Tower Systems.
Example 1 513 flow processs, as shown in table 1.
Example 2 522 flow processs, as shown in table 2.
Example 3 623 flow processs, as shown in table 3.
Example 4 823 flow processs, as shown in table 4.
Example 5 824 flow processs, as shown in table 5.
Example 6 825 flow processs, as shown in table 6.
Except that the flow process shown in above-mentioned each example, other flow scheme design can also be arranged.As, 723 flow processs in 7 Tower Systems, 724 flow processs, 733 flow processs, 742 flow processs; 834 flow processs in 8 Tower Systems, 843 flow processs, 852 flow processs, and the various combination flow process in the system such as 9 towers, 10 towers, 11 towers, 12 towers can be analogized according to said method, enumerate detailed description no longer one by one.Table 1 513 flow processs
The tower branch 1 2 3 7 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20
A A E1D E2D PP E3D PD P E3R E2R Isolate E1R FR
B E1R FR A E1D E2D PP E3D PD P E3R E2R Isolate
C E3R E2R Isolate E1R FR A E1D E2D PP E3D PD P
D E3D PD P E3R E2R Isolate E1R FR A E1D E2D PP
E E1D E2D PP E3D PD P E3R E2R Isolate E1R FR A
Table 2 522 flow processs
The tower branch 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20
A A E1D E2D PP PD P E2R Isolate E1R FR
B E1R FR A E1D E2D PP PD P E2R Isolate
C P E2R Isolate E1R FR A E1D E2D PP PD
D E1D E2D PP PD P E2R Isolate E1R FR A
E A E1D E2D PP PD P E2R Isolate E1R FR A
Table 3 623 flow processs
The tower branch 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18
A A E1D E2D PP E3D PD P E3R E2R E1R FR
B E1R FR A E1D E2D PP E3D PD P E3R E2R
C P E3R E2R E R FR A E1D E2D PP E3D PD
D PP E3D PD P E3R E2R E1R FR A E1D E2D
E E1D E2D PP E3D PD P E3R E2R E1R FR A
F A E1D E2D PP E3D PD P E3R E2R E1R FR A
Table 4 823 flow processs
The tower branch 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16
A A E1D E2D E3D PP PD P E3R E2R E1R FR
B E1R FR A E1D E2D E3D PP PD P E3R E2R
C E3R E2R E1R FR A E1D E2D E3D PP PD P
D P E3R E2R E1R FR A E1D E2D E3D PP PD
E PP PD P E3R E2R E1R FR A E1D E2D E3D PP
F E3D PP PD P E3R E2R E1R FR A E1D E2D
G E1D E2D E3D PP PD P E3R E2R E1R FR A
H A E1D E2D E3D PP PD P E3R E2R E1R FR A
Table 5 824 flow processs
The tower branch 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16
A A E1D E2D E3D E4D PP PD P E4R E3R E2R E1R FR
B E1R FR A E1D E2D E3D E4D PP PD P E4R E3R E2R
C E3R E2R E1R FR A E1D E2D E3D E4D PP PD P E4R
D P E4R E3R E2R E1R FR A E1D E2D E3D E4D PP PD
E PP PD P E4R E3R E2R E1R FR A E1D E2D E3D E4D
F E3D E4D PP PD P E4R E3R E2R E1R FR A E1D E2D
G E1D E2D E3D E4D PP PD P E4R E3R E2R E1R FR A
H A E1D E2D E3D E4D PP PD P E4R E3R E2R E1R FR A
Table 6 825 flow processs
The tower branch 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24
A A E1D E2D E3D E4D PP E5D PD P E5R E4R E3R E2R E1R FR
B E1R FR A E1D E2D E3D E4D PP E5D PD P E5R E4R E3R E2R
C E3R E2R E1R FR A E1D E2D E3D E4D PP E5D PD P E5R E4R
D P E5R E4R E3R E2R E1R FR A E1D E 2D E3D E4D PP E5D PD
E PP E5D PD P E5R E4R E3R E2R E1R FR A E1D E2D E3D E4D
F E3D E4D PP E5D PD P E5R E4R E3R E2R E1R FR A E1D E2D
G E1D E2D E3D E4D PP E5D PD P E5R E4R E3R E2R E1R FR A
H A E1D E2D E3D E4D PP E5D PD P E5R E4R E3R E2R E1R FR A

Claims (1)

  1. One kind in the work system of forming by a plurality of towers, each tower is respectively through pressurising absorption, all pressure and release or decompression desorption process realize that gas separates and the pressure swing absorption process of purifying, it is characterized in that in the system of total tower number N 〉=5, when the work tower number that carries out pressurising absorption simultaneously was n, all pressures number of times m in the workflow that this system carries out was m=N-n-l.
CN 93111987 1993-10-11 1993-10-11 Method for increasing equalizing frequency in process of pressure-swing adsorption Expired - Fee Related CN1063351C (en)

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