CN1235863A - High efficiency flexible variable-pressure adsorption technology - Google Patents
High efficiency flexible variable-pressure adsorption technology Download PDFInfo
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- CN1235863A CN1235863A CN 99106859 CN99106859A CN1235863A CN 1235863 A CN1235863 A CN 1235863A CN 99106859 CN99106859 CN 99106859 CN 99106859 A CN99106859 A CN 99106859A CN 1235863 A CN1235863 A CN 1235863A
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Abstract
The present invention features that in the parallel adsorption towers, there is flexibility in process, every tower is operated independently, and this makes it possible for every tower to have independent reasonable operation schedule and to have changeable number of towers according to the variation of processed material quality and the requirement for local mointenance service. Using high-surface adsorbent can reduce the times of compressing gas material. The preadsorption tower joins in periodic variable-pressure cleaning of operative circulation to stabilize the adsortpion capacity of adsorbent. Reverse pressure equalizing ensures the requirement of high purity and raises the utilization rate of adsorption bed.
Description
The present invention relates to a kind of efficient pressure swing adsorption technique with flexibility (flexible) flowage structure and flexible operation condition.It belongs to gas and separates and purification techniques.
Transformation absorption (Pressure Swing Adsorption, be called for short PSA) be that gas is adsorbed under elevated pressures, and under lower pressure from the adsorbent desorption, because of the equilibrium adsorption capacity difference of each component gas on adsorbent, or realize the cycling process that gas separates because of adsorption dynamics adsorption kinetics difference.The PSA flow process comprises more than one adsorption tower (absorber).In plural adsorption tower flow process,,, be called " all pressing " (Wagner,, U.S.Patent:3,430,418 in 1969) with needing the tower that boosts in the operation and needing the tower of step-down to be communicated with for reclaiming mechanical energy and improving product yield.In the multitower flow process,, repeatedly all press (L.B.Batta, U.S.Patent:3 in 1971,564,816) often according to each pressure tower grade.By the flow direction of logistics in tower, divide into and forward all press and reverse all pressures.Forward all pressing purpose is to increase product recovery rate, and reverse all the pressure with being intended to improve the definition of separation guarantees product purity.
A typical PSA circulation may further comprise the steps: the absorption high pressure under, forward pressure release, reverse pressure release, adsorbent reactivation, supercharging and finally supercharging (referring to Yang Zubao: " absorption method gas separates ", Chemical Industry Press, 1991).The problem that exists is: 1. equal press operation is closely linked the operation of adsorption tower all in the flow process (absorber), and the mode of operation of any tower all can involve whole flow process.Owing to take directly all to press between tower, make that the operating procedure ordering in the multitower flow process is complicated.Cooperate for looking after between tower, often can not distribute the time of each operating procedure fully according to optimum condition.Because the operating time ordering is closely related with the tower number, should not expand production capacity by the simple increase of adsorption tower number, under a certain tower breaks down situation, is difficult to accomplish not stop repairing.2. forward all press step to cause the forward position of strong adsorbent component to be moved, cause the adsorbent bed utilization rate to reduce, be equivalent to reduce the adsorption capacity of bed to the product gas outlet end of adsorbent bed.3. the adsorbent that present PSA technology is adopted comprises various zeolite molecular sieves, active carbon, carbon fiber, silica gel, activated alumina etc., investigate from specific area, mostly hundreds of to 1000m
2About/g, adsorption capacity is lower, and the required compression number of times to unstripped gas of production unit volume production product is more, causes energy consumption of unit product higher.4. the raw material gas purifying unit separates with psa unit, and clean unit adopts alternating temperature regeneration usually, and not synchronous with whole separation process.
The objective of the invention is to propose a kind of (flexible) transformation adsorption process of flexibility, wherein each adsorption tower moves under optimum condition independently, improves adsorption bed utilization rate and adsorption capacity, and the regeneration of clarifier and the regeneration of adsorption tower are coordinated.
The objective of the invention is to realize by transformation adsorption process shown in the drawings.C among the figure
1, C
2C
nIt is adsorption tower.S
1, S
2S
mBe intermediate storage tank, each pressure tank changes in desorption and adsorptive pressure scope successively.Each adsorption tower is to be connected with associated gas logistics pipeline side by side fully.That is: the products export end of each tower is connected with the product pipeline, and the other end is connected with unstripped gas pipeline or normal pressure desorption tracheae line after the purification of the intermediate storage tank connecting pipeline of different pressures grade, the pre-adsorption tower port of export respectively by valve.F
1And F
2Be pre-adsorption tower (clarifier); T
pIt is the product gas storage tank.In main adsorption tower, fill with the surperficial adsorbent of height (specific area 2000m for example
2The super-activated carbon that/g is above) is main compound adsorbent single or that form with other adsorbent, the single or compound adsorbent that the packing ratio surface area is lower, porosity is bigger in pre-adsorption tower, the strong adsorbent component in the occlusion unstripped gas.Unstripped gas at first under adsorptive pressure by one group of pre-adsorption tower, remove wherein unfavorable component for the difficult desorption of king-tower adsorbent.Enter the arrival end of main adsorption tower then, enter adsorption operations, the product component that is difficult for absorption then enters product tracheae line.After adsorption step stops,, all pressing (the reverse pressure release that this flow process has guaranteed adsorption tower) successively with intermediate storage tank, after another organizes pre-adsorption tower to the purge line pressure release according to pressure rating.By main adsorption tower and the pre-reverse purging of adsorption tower, gas enters purge line, makes regeneration of adsorbent beds with product gas for next step.Two groups of adsorption towers regularly switch.Can utilize the by-pass line and the pre-adsorption column pressure of normal pressure desorption tracheae line adjustment of pre-adsorption tower during switching.After the purge step, intermediate storage tank is all pressed (the forward supercharging that this flow process has guaranteed adsorption tower) successively according to pressure rating with main adsorption tower.At last, adopt product gas that main adsorption tower is carried out reverse supercharging, reach adsorptive pressure, finish and fill (pressure) step eventually.Operating feature of the present invention is that each adsorption tower always carries out reverse pressure release and forward supercharging with intermediate storage tank.
The invention has the advantages that: 1. have the flexibility on the flowage structure.Because each adsorption tower is in parallel on stream, the incision of a tower or cut-out do not upset the operation of whole transformation adsorption process, can realize not parking maintenance, can increase and decrease the adsorption tower number at any time according to the variation for the treatment of capacity yet.2. the flexibility that has operating condition.The operating condition of each tower (time of each step distributes) need not to consider and cooperating that other tower is operated, and therefore can be adjusted at optimum state.3. enlarged markedly the adsorption capacity of bed.Owing to adopt reverse pressure release, improve the bed utilization rate, and adopted high surperficial adsorbent, therefore significantly improved adsorption capacity, thereby reduce the number of times of producing required " supercharging-pressure release " circulation of a certain amount of product, so saved compression energy to unstrpped gas.4. help the raising of product yield.The product gas of taking out of when this flow process makes the adsorption tower pressure release enters the storage tank stores of centres at different levels, and reenters adsorption tower when supercharging forward, helps improving the yield of product gas.5. purifying column (pre-adsorption tower) participates in the transformation circulation, by " transformation " regeneration, rather than common " alternating temperature " regeneration, improved flow operations stability, and cut down the consumption of energy.6. the flexibility that has utilization of mechanical energy efficient.Intermediate storage tank not only reclaims the product gas that pressure release is gone out, and also reclaims simultaneously and releases the mechanical energy that gas comprises.Can increase and decrease the progression of intermediate storage tank according to the requirement of mechanical energy efficient.
Typical case's use-case:
Oil refinery dry gas is carried hydrogen.Hydrogen content is about 50% in the dry gas, and other component mainly is C
1-C
3, N
2, O
2Deng.4 main adsorption towers are arranged on stream, 2 pre-adsorption towers.Fill the compound adsorbent of forming by super-activated carbon and 5A molecular sieve in the main adsorption tower, in pre-adsorption tower, fill the compound adsorbent of forming by dehydrated adsorbent and common active carbon.Adsorptive pressure 0.8MPa, adsorbent bed purges regeneration through pure hydrogen normal pressure.Two-stage intermediate storage tank, operating pressure be respectively 0.3 and 0.6MPa about.Compare with existing 4 tower PSA technologies, hydrogen purity, yield index significantly improve, and energy consumption obviously reduces.
Claims (2)
1. high efficiency flexible variable-pressure adsorption technology, mainly by 1 to a plurality of adsorption towers, the intermediate storage tank more than 1 grade, 2 groups of pre-adsorption towers constitute, and it is characterized in that: each adsorption tower links to each other with the gas stream pipeline side by side, realizes each tower independent operation; Adsorption tower and intermediate storage tank carry out reverse pressure release and forward supercharging; Unstripped gas at first passes through pre-adsorption tower before entering adsorption tower, and pre-adsorption tower forward adsorbs for one group, one group of reverse purging regeneration in the transformation circulation, switching regularly; Main packing ratio surface area is 2000m in the adsorption tower
2The high surperficial adsorbent that/g is above, or with the mixed adsorbent of other adsorbent, the packing ratio surface area is lower in the pre-adsorption tower, the adsorbent that porosity is bigger.
2. by the said high efficiency flexible variable-pressure adsorption technology of claim 1, it is characterized in that: the high surperficial adsorbent of filling in the described adsorption tower is super-activated carbon, NACF, or their surface modification goods.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN99106859A CN1095387C (en) | 1999-05-18 | 1999-05-18 | High efficiency flexible variable-pressure adsorption technology |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN99106859A CN1095387C (en) | 1999-05-18 | 1999-05-18 | High efficiency flexible variable-pressure adsorption technology |
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| CN1235863A true CN1235863A (en) | 1999-11-24 |
| CN1095387C CN1095387C (en) | 2002-12-04 |
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|---|---|---|---|
| CN99106859A Expired - Fee Related CN1095387C (en) | 1999-05-18 | 1999-05-18 | High efficiency flexible variable-pressure adsorption technology |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105194980A (en) * | 2015-10-27 | 2015-12-30 | 上海致净环保科技有限公司 | Waste incineration tail gas end purifying apparatus and application thereof |
| CN107399719A (en) * | 2016-05-18 | 2017-11-28 | 乔治洛德方法研究和开发液化空气有限公司 | The VSA type oxygen generation methods of periodic regeneration |
| CN114950071A (en) * | 2022-06-15 | 2022-08-30 | 北京化工大学 | A pressure swing adsorption device and process for efficiently recovering adsorbed components |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3450885B2 (en) * | 1993-07-27 | 2003-09-29 | 住友精化株式会社 | Method and apparatus for separating nitrogen-enriched gas |
| US5656065A (en) * | 1995-10-04 | 1997-08-12 | Air Products And Chemicals, Inc. | Multibed pressure swing adsorption apparatus and method for the operation thereof |
-
1999
- 1999-05-18 CN CN99106859A patent/CN1095387C/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105194980A (en) * | 2015-10-27 | 2015-12-30 | 上海致净环保科技有限公司 | Waste incineration tail gas end purifying apparatus and application thereof |
| CN107399719A (en) * | 2016-05-18 | 2017-11-28 | 乔治洛德方法研究和开发液化空气有限公司 | The VSA type oxygen generation methods of periodic regeneration |
| CN114950071A (en) * | 2022-06-15 | 2022-08-30 | 北京化工大学 | A pressure swing adsorption device and process for efficiently recovering adsorbed components |
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|---|---|
| CN1095387C (en) | 2002-12-04 |
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