CN102600698A - Variable-pressure absorption system and control method of variable-pressure absorption system - Google Patents

Variable-pressure absorption system and control method of variable-pressure absorption system Download PDF

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Publication number
CN102600698A
CN102600698A CN2012100690686A CN201210069068A CN102600698A CN 102600698 A CN102600698 A CN 102600698A CN 2012100690686 A CN2012100690686 A CN 2012100690686A CN 201210069068 A CN201210069068 A CN 201210069068A CN 102600698 A CN102600698 A CN 102600698A
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valve
pneumatic operated
operated valve
pressure
adsorption tower
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CN102600698B (en
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李勤
黄光玉
董洁丹
李明刚
徐红波
邵建农
孙志超
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ZHEJIANG QINCE AIR SEPARATION UNIT CO Ltd
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ZHEJIANG QINCE AIR SEPARATION UNIT CO Ltd
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Abstract

The invention provides a variable-pressure absorption system, which comprises a silencer, pneumatic valves, absorption towers, one-way valves and throttle valves, wherein the pneumatic valves comprise a first pneumatic valve, a second pneumatic valve, a third pneumatic valve, a fourth pneumatic valve, a fifth pneumatic valve, a sixth pneumatic valve, a seventh pneumatic valve and an eighth pneumatic valve, the one-way valves comprise a first one-way valve, a second one-way valve and a third one-way valve, and the throttle valves comprise a first throttle valve, a second throttle valve and a third throttle valve. A control method of the variable-pressure absorption system sequentially comprises the following steps that: 1, opening the fifth pneumatic valve and the sixth pneumatic valve; 2, after the pressure equalizing, carrying out pressure raising regeneration on the first absorption tower and carrying out pressure raising absorption on the second absorption tower; and 3, opening the seventh pneumatic valve and the eighth pneumatic valve, and making finished product air enter a buffer tank. The variable-pressure absorption system has the beneficial effects that through a flow rate meter and a pressure regulating valve, and the regenerated air quantity is regulated to a value obtained through calculation according to a formula, so the absorption capability of the variable-pressure absorption system is better, the purity of the obtained finished product air is improved, and in addition, the finished product air obtaining time is greatly reduced.

Description

A kind of pressure swing adsorption system and control method thereof
Technical field
Patent of the present invention relates to a kind of pressure swing adsorption system and control method thereof, relates in particular to the pressure swing adsorption system and the control method thereof in a kind of air separation field.
Background technology
Transformation adsorbed gas separation equipment principle is to adopt fixed absorbent, utilizes the principle of transformation absorption to obtain the equipment of finished product gas.Under certain cycle, utilize the difference of mist, through the keying of programmable controller controls pneumatic operated valve in the adsorbance of adsorbent surface; Reach A, B two tower alternate cycles; The process of pressurization absorption, decompression desorption is accomplished mist and is separated, thereby obtains the finished product gas of required purity.
An absorber finishes to the course of work of absorption once more following from absorption: absorption end → all pressure → decompressions → regeneration wash → is all pressed → is boosted → absorption once more.
In order to make the cost-effective realization of transformation adsorption method of separation; Except adsorbent will have the good adsorption performance; The regeneration of adsorbent also has crucial meaning; The regeneration level of adsorbent has determined product gas purity, also affects the adsorption capacity of adsorbent, and the consumption size of regeneration gas is determining the degree of regeneration gas.The regeneration gas flushing of transformation absorption be product gas through needing the adsorbent bed of regeneration, the dividing potential drop that is adsorbed component with purge gas pass through descend, the regeneration level of adsorbent has determined the consumption and the pressure of purge gas.
The structure chart of process equipment such as accompanying drawing 1: one: the first adsorption tower of operation is all pressed to second adsorption tower, and the 5th pneumatic operated valve and the 6th pneumatic operated valve are opened pressure balance; Operation adsorption tower decompression in two: the first; Second adsorption tower boosts, and first pneumatic operated valve, the 4th pneumatic operated valve, the 8th pneumatic operated valve are opened, and second adsorption tower gets into duty; Regeneration gas is washed first adsorption tower through the first pneumatic operated valve emptying, operation three through the first throttle valve; Second adsorption tower is all pressed to first adsorption tower, and the 5th pneumatic operated valve and the 6th pneumatic operated valve are opened pressure balance.Operation four; The decompression of second adsorption tower, first adsorption tower boosts, and second pneumatic operated valve, the 3rd pneumatic operated valve, the 7th pneumatic operated valve are opened, and first adsorption tower gets into duty, and regeneration gas is washed second adsorption tower through the second pneumatic operated valve emptying through the first throttle valve.
Adopt above-mentioned technological process, can produce following shortcoming:
1, regeneration gas pressure is higher comparatively speaking, influences the regeneration effect of adsorbent, and the regeneration rate of adsorbent has also reduced;
2, the flow of regeneration gas cannot be measured the regeneration gas flow accurately only with feel, and it is longer to make equipment reach time of optimum state, increases the time of the debugging of equipment;
3, the backflow of surge tank finished product gas causes the instability of the flow and the pressure of finished product gas, and needing increases the surge tank volume, causes cost waste.
Summary of the invention
The technical issues that need to address of the present invention provide pressure swing adsorption system and the control method thereof that a kind of adsorbent utilization rate is high, practice thrift cost and finished gas-flow amount and pressure stability.
For addressing the above problem, the present invention realizes through following technical scheme.
A kind of pressure swing adsorption system; Comprise silencer, pneumatic operated valve, adsorption tower, check valve and choke valve; Described pneumatic operated valve comprises first pneumatic operated valve, second pneumatic operated valve, the 3rd pneumatic operated valve, the 4th pneumatic operated valve, the 5th pneumatic operated valve, the 6th pneumatic operated valve, the 7th pneumatic operated valve and the 8th pneumatic operated valve; Described check valve comprises first check valve, second check valve and the 3rd check valve; Described choke valve comprises first throttle valve, second choke valve and the 3rd choke valve, and silencer is connected with second pneumatic operated valve with first pneumatic operated valve respectively through pipeline, and the 3rd pneumatic operated valve is provided with admission line with the pipeline that the 4th pneumatic operated valve is connected; First pneumatic operated valve is connected with first adsorption tower through pipeline with the 3rd pneumatic operated valve; Second pneumatic operated valve is connected with second adsorption tower through pipeline with the 4th pneumatic operated valve, and first adsorption tower is connected with the 6th pneumatic operated valve, first check valve and the 7th pneumatic operated valve respectively through pipeline, and second adsorption tower is connected with the 6th pneumatic operated valve, second check valve and the 8th pneumatic operated valve respectively through pipeline; First check valve is connected with the first throttle valve through pipeline with second check valve; First throttle valve, flowmeter and pressure regulator valve are connected through pipeline in order, and the 7th pneumatic operated valve, the 8th pneumatic operated valve and pressure regulator valve are connected with the 3rd check valve through pipeline, and the 3rd check valve, second choke valve, surge tank and the 3rd choke valve are connected through pipeline successively.
A kind of control method of pressure swing adsorption system comprises following sequential steps:
The first step is opened the 5th pneumatic operated valve and the 6th pneumatic operated valve, gas flow second adsorption tower of first adsorption tower, pressure balance behind the 1-2S;
Second step, after all pressing, first adsorption tower step-down regeneration, the absorption of boosting of second adsorption tower, 1-3 is in second, and the pressure of adsorption tower rises to normal sorption pressure;
The 3rd step; After unstripped gas adsorbs through adsorption tower; Make finished product gas, open the 7th pneumatic operated valve and the 8th pneumatic operated valve, finished product gas gets into surge tank and supplies the user to use; Another road finished product gas is decompressed to 0.3MPa through pressure regulator valve with the regeneration phase cleaning pressure, tries to achieve required regeneration tolerance W:W=1.15W through following formula 0(t b/ t p) (P b/ P 0) in the formula, W 0Be the initial mass flow of gas, t pBe regeneration scavenging period, P bBe wash phase outlet pressure, t bBe adsorption time, P 0Be adsorptive pressure,, regeneration tolerance be adjusted to the value through the formula gained, get into the adsorption tower regeneration that regeneration purges through check valve at last again through flowmeter and throttle valve adjustment.
The beneficial effect of a kind of pressure swing adsorption system of the present invention and control method thereof is:
1. the regeneration sweep gas is through after the pressure regulation of pressure regulator valve, and adsorbent has obtained more better regeneration, has improved the utilization rate of adsorbent;
2. the demonstration through the flowmeter scale is regulated Flow-rate adjustment to regeneration gas on the test data of the optimum state that laboratory at ordinary times measures, and has reduced the debug time of equipment;
3. avoid the finished product gas in the surge tank to reflux through check valve, reduced the volume of surge tank, practiced thrift cost;
4. through flowmeter and pressure regulator valve, the tolerance of will regenerating W is adjusted to through formula: W=1.15W 0(t b/ t p) (P b/ P 0) calculate the value of gained, make the adsorption capacity of pressure swing adsorption system better, the finished product gas purity that obtains rises and is worth the time of finished product gas to shorten greatly.
Description of drawings
Fig. 1: be structural representation of the present invention;
Fig. 2: prior art and patented technology are to the curve map of eligible state required time contrast.
The specific embodiment
Below in conjunction with embodiment and accompanying drawing patent of the present invention is described further.
Embodiment 1
As shown in Figure 1; A kind of pressure swing adsorption system; Comprise silencer 1, pneumatic operated valve, adsorption tower, check valve and choke valve; Described pneumatic operated valve comprises first pneumatic operated valve 2, second pneumatic operated valve 3, the 3rd pneumatic operated valve 4, the 4th pneumatic operated valve 5, the 5th pneumatic operated valve 6, the 6th pneumatic operated valve 7, the 7th pneumatic operated valve 8 and the 8th pneumatic operated valve 9; Described check valve comprises first check valve 10, second check valve 11 and the 3rd check valve 12; Described choke valve comprises first throttle valve 13, second choke valve 14 and the 3rd choke valve 15, and said adsorption tower comprises first adsorption tower 16 and second adsorption tower 17, and silencer 1 is connected with second pneumatic operated valve 3 with first pneumatic operated valve 2 respectively through pipeline; The 3rd pneumatic operated valve 4 is provided with admission line 21 with the pipeline that the 4th pneumatic operated valve 5 is connected; First pneumatic operated valve 2 is connected with first adsorption tower 16 through pipeline with the 3rd pneumatic operated valve 4, and second pneumatic operated valve 3 is connected with second adsorption tower 17 through pipeline with the 4th pneumatic operated valve 5, and first adsorption tower 16 is connected with the 7th pneumatic operated valve 8 with the 6th pneumatic operated valve 7, first check valve 10 respectively through pipeline; Second adsorption tower 17 is connected with the 8th pneumatic operated valve 9 with the 6th pneumatic operated valve 7, second check valve 11 respectively through pipeline; First check valve 10 is connected with first throttle valve 13 through pipeline with second check valve 11, and first throttle valve 13, flowmeter 18 and pressure regulator valve 19 are connected through pipeline in order, and the 7th pneumatic operated valve 8, the 8th pneumatic operated valve 9 are connected with the 3rd check valve 12 through pipeline 19 with pressure regulator valve; The 3rd check valve 12, second choke valve 14, surge tank 20 are connected through pipeline with the 3rd choke valve 15 successively, and the 3rd choke valve 15 is connected 22 with outlet pipe.
A kind of control method of pressure swing adsorption system comprises following sequential steps:
The first step is opened the 5th pneumatic operated valve and the 6th pneumatic operated valve, gas flow second adsorption tower of first adsorption tower, pressure balance behind the 1-2S;
Second step, after all pressing, first adsorption tower step-down regeneration, the absorption of boosting of second adsorption tower, 1-3 is in second, and the pressure of adsorption tower rises to normal sorption pressure;
The 3rd step; After unstripped gas adsorbs through adsorption tower; Make finished product gas, open the 7th pneumatic operated valve and the 8th pneumatic operated valve, finished product gas gets into surge tank and supplies the user to use; Another road finished product gas is decompressed to 0.3MPa through pressure regulator valve with the regeneration phase cleaning pressure, tries to achieve required regeneration tolerance W:W=1.15W through following formula 0(t b/ t p) (P b/ P 0) in the formula, W 0Be the initial mass flow of gas, t pBe regeneration scavenging period, P bBe wash phase outlet pressure, t bBe adsorption time, P 0Be adsorptive pressure,, regeneration tolerance be adjusted to the value through the formula gained, get into the adsorption tower regeneration that regeneration purges through check valve at last again through flowmeter and throttle valve adjustment.
Embodiment 2
As shown in Figure 2, adopt prior art, after handling through 60 minutes; Technology purity is still 99.99%, and the technology of employing this patent, after processing in more than 50 minutes; Technology purity just gets to 99.999%, and the regeneration level of adsorbent has determined regeneration tolerance size and pressure, the pressure of the attenuating regeneration gas of pressure regulator valve; The better regeneration that adsorbent is obtained, and flowmeter and throttle valve control regeneration tolerance, the words of regenerating large-minded; Influence the flow and the purity of finished product gas, the words of regenerating narrow-minded influence the regeneration of adsorbent, and the present invention is adjusted to regeneration tolerance the ratio of optimum state; Reduce the debug time of equipment, the time of the purity rising of equipment has been accelerated, practiced thrift the cost of equipment.

Claims (2)

1. pressure swing adsorption system; Comprise silencer, pneumatic operated valve, adsorption tower, check valve and choke valve; It is characterized in that: described pneumatic operated valve comprises first pneumatic operated valve, second pneumatic operated valve, the 3rd pneumatic operated valve, the 4th pneumatic operated valve, the 5th pneumatic operated valve, the 6th pneumatic operated valve, the 7th pneumatic operated valve and the 8th pneumatic operated valve; Described check valve comprises first check valve, second check valve and the 3rd check valve; Described choke valve comprises first throttle valve, second choke valve and the 3rd choke valve; Silencer is connected with second pneumatic operated valve with first pneumatic operated valve respectively through pipeline, and the 3rd pneumatic operated valve is provided with admission line with the pipeline that the 4th pneumatic operated valve is connected, and first pneumatic operated valve is connected with first adsorption tower through pipeline with the 3rd pneumatic operated valve; Second pneumatic operated valve is connected with second adsorption tower through pipeline with the 4th pneumatic operated valve; First adsorption tower is connected with the 6th pneumatic operated valve, first check valve and the 7th pneumatic operated valve respectively through pipeline, and second adsorption tower is connected with the 6th pneumatic operated valve, second check valve and the 8th pneumatic operated valve respectively through pipeline, and first check valve is connected with the first throttle valve through pipeline with second check valve; First throttle valve, flowmeter and pressure regulator valve are connected through pipeline in order; The 7th pneumatic operated valve, the 8th pneumatic operated valve and pressure regulator valve are connected with the 3rd check valve through pipeline, and the 3rd check valve, second choke valve, surge tank and the 3rd choke valve are connected through pipeline successively, and the 3rd choke valve is connected with outlet pipe.
2. the control method of a pressure swing adsorption system is characterized in that: comprise following sequential steps:
The first step is opened the 5th pneumatic operated valve and the 6th pneumatic operated valve, gas flow second adsorption tower of first adsorption tower, pressure balance behind the 1-2S;
Second step, after all pressing, first adsorption tower step-down regeneration, the absorption of boosting of second adsorption tower, 1-3 is in second, and the pressure of adsorption tower rises to normal sorption pressure;
The 3rd step; After unstripped gas adsorbs through adsorption tower; Make finished product gas, open the 7th pneumatic operated valve and the 8th pneumatic operated valve, finished product gas gets into surge tank and supplies the user to use; Another road finished product gas is decompressed to 0.3MPa through pressure regulator valve with the regeneration phase cleaning pressure, tries to achieve required regeneration tolerance W:W=1.15W through following formula 0(t b/ t p) (P b/ P 0) in the formula, W 0Be the initial mass flow of gas, t pBe regeneration scavenging period, P bBe wash phase outlet pressure, t bBe adsorption time, P 0Be adsorptive pressure,, regeneration tolerance be adjusted to the value through the formula gained, get into the adsorption tower regeneration that regeneration purges through check valve at last again through flowmeter and throttle valve adjustment.
CN201210069068.6A 2012-03-16 2012-03-16 Variable-pressure absorption system and control method of variable-pressure absorption system Expired - Fee Related CN102600698B (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105592910A (en) * 2013-10-04 2016-05-18 乔治洛德方法研究和开发液化空气有限公司 Method of pressure swing adsorption with regulation
CN107892283A (en) * 2017-11-13 2018-04-10 苏州展拓净化科技有限公司 Nitrogen separation solidifies storage device in a kind of air
CN111659229A (en) * 2020-06-30 2020-09-15 浙江勤策空分设备有限公司 Pressure swing adsorption oxygen equipment

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1114101A (en) * 1993-07-27 1995-12-27 住友精化株式会社 Method and apparatus for separating nitrogen-rich gas
US6171371B1 (en) * 1998-04-07 2001-01-09 L'air Liquide, Societe Anonyme Pour L'etude Et L'exploitation Des Procedes Georges Claude Process and unit for producing oxygen by adsorption with a short cycle
JP2005270953A (en) * 2004-02-27 2005-10-06 Kuraray Chem Corp Method for separating mixture gas, and device for separating nitrogen gas and system for consuming nitrogen gas
KR100679175B1 (en) * 2006-01-26 2007-02-06 주식회사 옥서스 Gas concentrating method and apparatus for having sequential upper equalizatioin steps and upper/lower combination equalizatioin steps
CN101691209A (en) * 2009-09-28 2010-04-07 苏州市金宏气体有限公司 Preparation method of high pressure ultra-pure hydrogen
CN201664568U (en) * 2010-03-24 2010-12-08 杭州吉大空分设备有限公司 PSA high efficiency starting device

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1114101A (en) * 1993-07-27 1995-12-27 住友精化株式会社 Method and apparatus for separating nitrogen-rich gas
US6171371B1 (en) * 1998-04-07 2001-01-09 L'air Liquide, Societe Anonyme Pour L'etude Et L'exploitation Des Procedes Georges Claude Process and unit for producing oxygen by adsorption with a short cycle
JP2005270953A (en) * 2004-02-27 2005-10-06 Kuraray Chem Corp Method for separating mixture gas, and device for separating nitrogen gas and system for consuming nitrogen gas
KR100679175B1 (en) * 2006-01-26 2007-02-06 주식회사 옥서스 Gas concentrating method and apparatus for having sequential upper equalizatioin steps and upper/lower combination equalizatioin steps
CN101691209A (en) * 2009-09-28 2010-04-07 苏州市金宏气体有限公司 Preparation method of high pressure ultra-pure hydrogen
CN201664568U (en) * 2010-03-24 2010-12-08 杭州吉大空分设备有限公司 PSA high efficiency starting device

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105592910A (en) * 2013-10-04 2016-05-18 乔治洛德方法研究和开发液化空气有限公司 Method of pressure swing adsorption with regulation
CN105592910B (en) * 2013-10-04 2019-01-04 乔治洛德方法研究和开发液化空气有限公司 Has well-regulated pressure swing absorption process
CN107892283A (en) * 2017-11-13 2018-04-10 苏州展拓净化科技有限公司 Nitrogen separation solidifies storage device in a kind of air
CN111659229A (en) * 2020-06-30 2020-09-15 浙江勤策空分设备有限公司 Pressure swing adsorption oxygen equipment

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