CN1394665A - Single-system one-step series-connected pressure swing adsorption process - Google Patents
Single-system one-step series-connected pressure swing adsorption process Download PDFInfo
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- CN1394665A CN1394665A CN 02133585 CN02133585A CN1394665A CN 1394665 A CN1394665 A CN 1394665A CN 02133585 CN02133585 CN 02133585 CN 02133585 A CN02133585 A CN 02133585A CN 1394665 A CN1394665 A CN 1394665A
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Abstract
The single system one-step series pressure swing adsorption process is characterized by that in the system formed from at least three adsorption towers the raw material gas is fed into X tower to make adsorption, the outputted off-test product gas is fed into Y tower to make adsorption and obtain qualified product gas, when the adsorbable component in the product gas will exceed standard, the output can be cut off, at this time X tower adsorption is completed, then other pressure swing adsorption steps are made; at the same time the raw material gas can be fed into Y tower to make adsorption, and its outputted off-test product gas can be fed into Z tower to make adsorption and outupt qualified product gas. Said operation can be circularly made, and can further raise utilization rate of adsorbent.
Description
One, technical field
The invention belongs to transformation adsorbed gas separation technology field, be specifically related to a kind of single-system one-step series-connected pressure swing adsorption process, promptly in the single stage adsorption regeneration cycle system that is provided with, realize the technology of tandem type pressure-swing absorption process.
Two, background technology
The mist with different separations that produces in chemical process all can be separated into easy adsorbent component and difficult adsorbent component with it by pressure swing absorption process, and be recycled.
For the method that can obtain easy adsorbent component and difficult adsorbent component by separation simultaneously, prior art has the one-step method parallel system, as CN1195572A.Because easily adsorbent component does not allow to penetrate in a large number adsorbent bed under the condition of one-step method absorption in parallel, otherwise will make the adsorption tower mouth by easily adsorbent component pollution, influence the purity of difficult adsorbent component, so the utilization rate of adsorbent is low, the adsorption tower volume is bigger, and it is higher to cause system to set up cost.In order to overcome the defective that one-step method exists, CN1140418A, CN1235862A, CN1334135A, CN1334136A, CN1342509A, CN1347747A and CN1248482A etc. disclose multiple tandem type pressure swing adsorption method.These pressure swing absorption process all are that the gas after the absorption of first cover system is all adsorbed once more as the unstripped gas of second cover system absorption, and export difficult adsorbent component product gas from second cover system, just adopt two cover systems to finish the process of transformation absorption output product in two steps.Obviously, these methods can improve the utilization rate of adsorbent and the purity of difficult adsorbent component to a certain extent, but because the saturation depth of second level absorption is not enough, adsorbent does not still make full use of, and two cover systems are arranged in addition, so also exist floor space big, system complex, program-controlled valve is many, and maintenance load is big, shortcomings such as non-failure operation time is short, and construction investment is big.In addition, if when large-scale pressure swing adsorption system needs multitower air inlet simultaneously, because of the gas that can't guarantee the outlet of first cover system can cause system's adsorption efficiency reduction by the concentration inlet of sending into second cover system from low to high of easy adsorbent component.
Three, summary of the invention
The objective of the invention is to overcome the defective that prior art exists, provide a kind of and can reduce investment, energy efficient reduces the system complex degree, further improves the single-system one-step series-connected pressure swing adsorption process of adsorbent utilization rate.
The objective of the invention is to reach like this: in the absorption regeneration circulatory system that the adsorption tower that is filled with adsorbent by at least three is formed, mist at first enters the X tower absorption of this system as unstripped gas, after the substandard product gas 1 after the X tower absorption entered the Y tower by the outlet of X tower by sequencing valve and adsorbs once more, difficult adsorbent component was discharged by the Y top of tower as product gas 1; When the easy adsorbent component content in the difficult adsorbent component is 0.01～5%, product gas 1 output to be cut off, this moment, X tower adsorption step finished, and carried out equal pressure drop subsequently successively, found time, all voltage rises, processing step such as dashes eventually, and exhaust can be used as product gas 2 and exports; Meanwhile unstripped gas switches to the import of Y tower and adsorbs, and the substandard product gas 1 after the absorption of Y tower enters the Z tower by the outlet of Y tower by sequencing valve and adsorbs once more, and difficult adsorbent component is discharged by the Z column overhead again as product gas 1, and so circulation goes round and begins again.
In order further to improve the yield of product gas, and reduce the system engineering cost, also be provided with 0～10 in the system of the present invention and all press tower, make all to press and both can between adsorption tower, carry out, also can be and all press between the tower and carry out at adsorption tower.And final all pressure drops can be reversely or forward, specifically determine according to technological requirement.When carrying hydrogen or methanol-fueled exhaust and carry hydrogen as conversion gas decarbonization, synthetic ammonia tailgas in Ammonia Production, easily adsorbent component is not because of exporting as product gas 2, its final all pressure drop is then adopted reverse, so just can utilize overbottom pressure flushing adsorbent bed in the tower, take away easily adsorbent component of a part, alleviate the load of finding time, reduce the energy consumption of finding time.And the conversion qi exhaustion carbon dioxide in the urea production etc., because of easily adsorbent component will be as 2 outputs of product gas, its final all pressure drop is then adopted forward.
In addition, when hanging down, then all also be provided with the pressurized displacement step after the pressure drop final as if the concentration of the easy adsorbent component of some material mixed gas.
And can be 0.05～5MPa for the absorption pressure and the control of product output pressure of system, specifically need by unstripped gas state and the decision of product gas technic index.
The adsorbent of adsorption tower of the present invention filling can be at least a in activated alumina, active carbon, molecular sieve, the silica gel, its filling mode, filling kind, filling combination, filling ratio determine that according to the technic index of unstripped gas composition and the requirement of product gas these all are the known knowledge of present technique field professional during use.
In sum, compared with the prior art the present invention has the following advantages:
1, further improved the utilization rate of adsorbent.Because any adsorption tower in the system of the present invention all will experience the once absorption and the profound second adsorption process of shallow hierarchy, it is to enter adsorption tower from low to high that the branch of easy adsorbent component is pressed in this process, and after profound level absorption, just enter desorption phase, the degree of saturation of adsorbent is higher, the consumption of corresponding adsorbent is just less, and utilization rate is just high.
2, plant construction cost and operating cost have been reduced.Because the present invention utilizes a level system one step to realize series connection absorption, thus with two system's two-step methods to compare floor space little, used program-controlled valve is less, the comparable two-step method joint of construction investment medicine about 30%.Because system is simpler, and maintenance capacity will reduce, will increase non-failure operation time, thereby reduce operating cost, improve production efficiency in addition.
3, reduced system energy consumption.Because the degree of saturation of adsorbent is higher after profound level absorption, if easy adsorbent component is not wherein exported as product gas 2, reverse step-down mode is adopted in final all pressure drops, just can utilize overbottom pressure flushing adsorbent bed in the tower, take away easily adsorbent component of a part, alleviate the load of finding time, reduce the energy consumption of finding time.In addition when easily adsorbent component reaches finite concentration in the material mixed gas, because the gas of finding time can not need pressurized displacement, thereby reduce energy consumption directly as 2 outputs of product gas.If easily adsorbent component concentration is lower in the material mixed gas, even all carry out pressurized displacement after the pressure drop final, also because the degree of depth of adsorbent is saturated, and replacement amount is also little than current methods, corresponding energy consumption is also little than current methods.
4, applied widely.Method provided by the invention is applicable to the adsorbing separation with different separation gaseous mixtures, as the various conversion gas that need purify, off-gas, coke oven flue gas, air etc. in chemical industry, oil, the metallurgical production process.
Four, the specific embodiment
Also the invention will be further described to provide embodiment below.This art skilled person is necessary to be pointed out that at this following examples can not be interpreted as limiting the scope of the invention, if must belong to protection domain of the present invention according to the invention described above content to some nonessential improvement and the adjustment that the present invention makes.
Embodiment 1:
Present embodiment is the single-system one-step series-connected pressure swing adsorption process that synthetic ammonia tailgas is carried hydrogen.Unstripped gas pressure is gauge pressure 1.8MPa.Present embodiment adopts 62124 flow processs, and promptly system is six tower flow processs, two towers series connection air inlet, and single tower is found time continuously, directly all presses for twice, all presses indirectly for four times.What table one provided is 1/2nd technology sequential steps of each tower of present embodiment, and remainder can be analogized in proper order with reference to this table.
Table one 62124 flow processs
| ???A | Once absorption | Second adsorption | Six step-downs | |||
| ???B | Contrary putting | Find time | Boost for six times | Dash eventually | ||
| ???C | Boost | Dash eventually | Once absorption | Second adsorption | ||
| ???D | Six step-downs | Contrary putting | Find time | Boost for six times | ||
| ???E | Find time | Boost for six times | Dash eventually | Once absorption | ||
| ???F | Second adsorption | Six step-downs | Contrary putting | Find time | ||
Be that example is illustrated with the A tower below:
Synthetic ammonia tailgas is delivered to system's within battery limit through pipeline, is input to native system by flow-control.The first step, unstripped gas enters the F tower inlet of finishing shallow hierarchy absorption for the first time by inlet valve and carries out the profound absorption second time, the defective hydrogen of F tower output enters along airintake direction by transfer valve and just finishes the transfer valve of breaking through the A tower bottom of journey eventually and carry out adsorbing first time, impurity is adsorbed in this process, and qualified hydrogen is delivered to product gas surge tank from the top of A tower by product gas output valve; Second step is when the content of impurity in the hydrogen reaches technic index limit (N in the hydrogen for example
2+ CH
4Content is 0.1%) time, close input of A tower and output valve, close the charging of F tower and stop air inlet with carrying valve F tower.Open A tower raw material inlet valve and carry valve, the A tower begins absorption for the second time, the defective gas of A top of tower enters the C tower bottom along airintake direction, the C tower begins for the first time absorption and output products hydrogen, and meanwhile the F tower begins to carry out successively equal pressure drop, contraryly puts, finds time, all voltage rises, the regeneration of adsorbent beds process such as dashes eventually; In the 3rd step, impurity content reaches technic index limit (N in the hydrogen for example in the hydrogen of C top of tower output
2+ CH
4Content is 0.1%) time, close A tower charging valve and transfer valve door and divide by the equalizing valve door and progressively reduce A tower pressure along airintake direction 6 times; The 4th step, close A tower equalizing valve door, open contrary put valve against airintake direction with the remaining pressure emptying of A tower to atmospheric pressure; The 5th step, close contrary put the opening of valves evacuation valve against airintake direction with the desorb of finding time of residual impurity gas; In the 6th step, close evacuation valve unlatching equalizing valve and divide the A tower pressure that progressively raises for six times against airintake direction; In the 7th step, close the equalizing valve unlatching and with product hydrogen the A tower be charged to the strong 1.75MPa of product hydrogen pressure against airintake direction towards valve eventually? so circulation goes round and begins again.
The product hydrogen purity of present embodiment is 99.9%, and yield is 95%.
Embodiment 2:
Present embodiment is the single-system one-step series-connected pressure swing adsorption process of conversion qi exhaustion carbon dioxide in the urea production.Unstripped gas pressure is gauge pressure 0.7MPa.Present embodiment adopts the A4242 flow process, and promptly system is ten tower flow processs, two groups of double-column in series air inlets, and two towers are found time simultaneously, directly all press for four times, all press indirectly for twice.What table two provided is 2/5ths technology sequential steps of each tower of present embodiment, and remainder can be analogized in proper order with reference to this table.
Table two A4242 flow process
| ??A | Once absorption | Second adsorption | ||||||
| ??B | Find time | Boost for six times | Dash eventually | Once absorption | ||||
| ??C | Along putting | Find time | Boost for six times | Dash eventually | ||||
| ???D | Six step-downs | Along putting | Find time | |||||||||
| ???E | Second adsorption | Six step-downs | ||||||||||
| ???F | Dash eventually | Once absorption | Second adsorption | |||||||||
| ???G | Find time | Six step-downs | Dash eventually | Once absorption | ||||||||
| ???H | Boost for six times | Along putting | Find time | Boost for six times | ||||||||
| ???I | Second adsorption | Six step-downs | Along putting | |||||||||
| ???J | Once absorption | Second adsorption | Six step-downs | |||||||||
Be that example is illustrated with the A tower below:
Urea conversion gas is delivered to system's within battery limit through pipeline, is input to native system by flow-control.The first step, unstripped gas enters the E tower inlet of finishing shallow hierarchy absorption for the first time by inlet valve and carries out the profound absorption second time, the defective hydrogen and nitrogen gas of E tower output enters along airintake direction by transfer valve and just finishes the transfer valve of breaking through the A tower bottom of journey eventually and carry out adsorbing first time, impurity is adsorbed in this process, and qualified hydrogen and nitrogen gas is delivered to product gas 1 surge tank from the top of A tower by product gas output valve as product gas 1; Second step is when the content of impurity in the hydrogen and nitrogen gas reaches technic index limit (CO in the hydrogen and nitrogen gas for example
2Content is 0.2%) time, close input of A tower and output valve, close the charging of E tower and stop air inlet with carrying valve E tower.Open A tower raw material inlet valve and carry valve, the A tower begins absorption for the second time, the defective gas of A top of tower enters the B tower bottom along airintake direction, the B tower begins for the first time absorption and output products gas 1, meanwhile the E tower begin to carry out successively equal pressure drop, along putting, find time, all voltage rises, the regeneration of adsorbent beds process such as dashing eventually; In the 3rd step, impurity content reaches technic index limit (CO in the hydrogen and nitrogen gas for example in the hydrogen and nitrogen gas of B top of tower output
2Content is 0.2%) time, close A tower charging valve and transfer valve door and divide by the equalizing valve door and progressively reduce A tower pressure along airintake direction 6 times; The 4th step, close A tower equalizing valve door, open along put valve along airintake direction with the remaining pressure emptying of A tower to atmospheric pressure; In the 5th step, close along putting the opening of valves evacuation valve and 98.5% carbon dioxide gas in the tower is found time desorb as 2 outputs of product gas against airintake direction; In the 6th step, close evacuation valve unlatching equalizing valve and divide the A tower pressure that progressively raises for six times against airintake direction; In the 7th step, close the equalizing valve unlatching and with the product hydrogen and nitrogen gas A tower be charged to the strong 0.65MPa of product air pressure against airintake direction towards valve eventually? so circulation goes round and begins again.
Carbon dioxide content is 0.2% in the product hydrogen and nitrogen gas of present embodiment, and the product hydrogen yield is 99%, and the nitrogen yield is 96%, and the product carbon dioxide purity is 98.5%, and yield is 95%.
Claims (7)
1, a kind of single-system one-step series-connected pressure swing adsorption process, it is characterized in that in the absorption regeneration circulatory system of forming by the adsorption tower of at least three filled with adsorbent, gaseous mixture at first enters the X tower absorption of this system as unstripped gas, after the substandard product gas 1 after the X tower absorption entered the Y tower by the outlet of X tower by sequencing valve and adsorbs once more, difficult adsorbent component was discharged by the Y top of tower as product gas 1; When the easy adsorbent component content in the difficult adsorbent component is 0.01～5%, product gas 1 output to be cut off, this moment, X tower adsorption step finished, and carried out equal pressure drop subsequently successively, found time, all voltage rises, processing step such as dashes eventually, and exhaust can be used as product gas 2 and exports; Meanwhile unstripped gas switches to the import of Y tower and adsorbs, and the substandard product gas 1 after the absorption of Y tower enters the Z tower by the outlet of Y tower by sequencing valve and adsorbs once more, and difficult adsorbent component is discharged by the Z column overhead again as product gas 1, and so circulation goes round and begins again.
2, single-system one-step series-connected pressure swing adsorption process according to claim 1 is characterized in that this system also is provided with 0～10 and all presses tower.
3, single-system one-step series-connected pressure swing adsorption process according to claim 1 and 2 is characterized in that also being provided with the pressurized displacement step after the final equal pressure drop of each tower.
4, single-system one-step series-connected pressure swing adsorption process according to claim 1 and 2, the final all pressure drops that it is characterized in that each tower are reverse or forward.
5, single-system one-step series-connected pressure swing adsorption process according to claim 3, the final all pressure drops that it is characterized in that each tower are reverse or forward.
6, according to claim 1 or 2 or 5 described single-system one-step series-connected pressure swing adsorption process, the output pressure that it is characterized in that adsorbing pressure and product gas is 0.05～5MPa.
7, single-system one-step series-connected pressure swing adsorption process according to claim 4, the output pressure that it is characterized in that adsorbing pressure and product gas is 0.05～5MPa.
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| CNB021335850A CN1175917C (en) | 2002-08-08 | 2002-08-08 | Single-system one-step series-connected pressure swing adsorption process |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102160955A (en) * | 2011-03-04 | 2011-08-24 | 四川同盛科技有限责任公司 | One-stage pressure swing adsorption process in ammonia-urea synthesizing production |
| CN104128073A (en) * | 2014-08-09 | 2014-11-05 | 湖南三箭自控科技有限公司 | Novel saturation adsorption process of pressure swing adsorption decarburization and device thereof |
-
2002
- 2002-08-08 CN CNB021335850A patent/CN1175917C/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102160955A (en) * | 2011-03-04 | 2011-08-24 | 四川同盛科技有限责任公司 | One-stage pressure swing adsorption process in ammonia-urea synthesizing production |
| CN104128073A (en) * | 2014-08-09 | 2014-11-05 | 湖南三箭自控科技有限公司 | Novel saturation adsorption process of pressure swing adsorption decarburization and device thereof |
| CN104128073B (en) * | 2014-08-09 | 2017-02-01 | 湖南三箭自控科技有限公司 | Saturation adsorption process of pressure swing adsorption decarburization and device thereof |
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| CN1175917C (en) | 2004-11-17 |
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Assignee: Sichuan Xinhua Technology Co., Ltd. Assignor: Wang Yu Contract fulfillment period: 2005.12.1 to 2015.12.1 Contract record no.: 2009510000132 Denomination of invention: Single-system one-step series-connected pressure swing adsorption process Granted publication date: 20041117 License type: Exclusive license Record date: 20091023 |
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| LIC | Patent licence contract for exploitation submitted for record |
Free format text: EXCLUSIVE LICENSE; TIME LIMIT OF IMPLEMENTING CONTACT: 2005.12.1 TO 2015.12.1; CHANGE OF CONTRACT Name of requester: SICHUAN XINHUA SCIENCE AND TECHNOLOGY CO., LTD. Effective date: 20091023 |
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Granted publication date: 20041117 Termination date: 20170808 |