CN102350171A - Method for separating gas in replacement mode - Google Patents
Method for separating gas in replacement mode Download PDFInfo
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- CN102350171A CN102350171A CN2011102646927A CN201110264692A CN102350171A CN 102350171 A CN102350171 A CN 102350171A CN 2011102646927 A CN2011102646927 A CN 2011102646927A CN 201110264692 A CN201110264692 A CN 201110264692A CN 102350171 A CN102350171 A CN 102350171A
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Abstract
The invention discloses a method for separating gas in a replacement mode. In the method, product gas yield is improved by using replacement tail gas. The defects that the replacement tail gas in a gas separation device is discharged so as to lose a part of product gas are overcome; at least six adsorption towers are combined together to realize circular adsorption; in the same time period, each adsorption tower finishes one process, a part of emptying gas is compressed and transferred to the adsorption tower in which gas is needed to be replaced; and after desorption of the adsorption tower, pressure reducing gas discharged in a pressure reducing process and replacement gas discharged in a replacement process are obtained through valve transferring so as to finish a pressure boosting process. High-concentration gas which is used in the replacement process is obtained by compressing emptying gas which is discharged in an emptying gas process, the replacement gas obtained after replacement is used as pressure boosting gas of another adsorption tower, and impurity gas in circulation is fully adsorbed so as to obtain product gas; and yield of product gas is improved.
Description
Technical field
The present invention relates to a kind of gas separating technology, especially a kind of gas separating method that utilizes displacement tail gas to improve the employing substitute mode of product gas productive rate.
Background technology
At present, in existing transformation adsorbed gas isolation technics, no matter be to be prone to absorption to get product mutually; Adsorb the system pure carbon dioxide like transformation, still difficult absorption gets product mutually, like transformation absorption hydrogen producing technology; Or promptly need obtain product mutually and need obtain product mutually from difficulty absorption again from being prone to absorption, being used for urea production like transformation absorption decarburization from synthetic-ammonia transformation gas, adsorption tower is when carrying out equal pressure drop and press ED; Gaseous mixture all is the bottom inflow from adsorption tower, and after the inner adsorbents adsorb of adsorption tower, product flows out from the top of adsorption tower; Perhaps enter into next adsorption tower and carry out the concentration purification, perhaps directly be stored in the reservoir.
Now in the gas separation; After the impurity of adsorption tower inside was replaced, the displacement gas of displacement gained directly discharged, when still in adsorption tower, replacing; Gas in the adsorption tower has also retained portioned product gas except impurity gas; If directly, cause product gas also to be discharged simultaneously, lost the productive rate that portioned product gas has reduced product gas with displacement gas discharging.
And in the existing gas separation; After the step-down adsorption tower is carried out adverse current emptying, at this moment, gas can get into from the top of adsorption tower; Discharge from the bottom of adsorption tower; Opposite with the gas flow of the operate as normal of adsorption tower absorption, also can portioned product gas be discharged from the bottom of adsorption tower, reduce ratio defective product.
Such as: Patent Office of the People's Republic of China has announced a CN1077447C patent on January 9th, 2002, name is called the serial flow pressure swing adsorption process that gas separates, this method at first, second, absorber and the series connection of product reservoir carry out in the loop that forms.Raw material is the admixture of gas that contains pollutant and product component, comprises step: 1, feed gas gets into first absorber, does temporarily to stop, and pressurization makes most contaminant component of adsorbents adsorb and the pure product gas of output then; 2, discharge pure product gas through second absorber and reservoir, first absorber and stream decompression; 3, to first, second, absorber does adverse current emptying; 4, with the clean gas in the reservoir to first, second absorber part supercharging; Repeating step 1-4 then.
Summary of the invention
The invention solves gas separates mid-ventilation and is discharged; Cause the defective of portioned product gas loss; The gas that the not emptying of a kind of displacement gas is provided and uses as another adsorption tower supercharging; Simultaneously can also separate the product gas that obtains in the displacement gas, improve the gas separating method of employing substitute mode of the productive rate of product gas.
The present invention has also solved and has used adverse current emptying in the prior art; Can take away the defective that product gas reduces product gas productive rate simultaneously; A kind of gas that uses method of replacing to obtain displacement gas and use as another adsorption tower supercharging is provided; Simultaneously can also separate the product gas that obtains in the displacement gas, improve the gas separating method of employing substitute mode of the productive rate of product gas.
The technical solution adopted for the present invention to solve the technical problems is: a kind of gas separating method that adopts substitute mode; Total at least 6 adsorption towers make up jointly realizes circulation absorption; In the same time, each adsorption tower is accomplished an operation, comprises the steps: that (1), unstripped gas are in valve forward gets into first adsorption tower; Impurity is adsorbed agent absorption and obtains product gas, and product gas flows out first adsorption tower through valve and gets into next workshop section; (2), product gas index reaches production target, adsorption process finishes, and through valve the gases at high pressure in first adsorption tower is forward transferred to and is accomplished the 5th adsorption tower that vacuumizes, and makes the 5th adsorption tower get into the operation of boosting, first adsorption tower is accomplished the step-down operation; (3), its pressure also is higher than normal pressure after the first adsorption tower step-down, then through valve the gas in first adsorption tower is discharged, emptying first adsorption tower is simultaneously with drop a hint compression and transferring in second adsorption tower that needs displacement of part; (4), shift after the first adsorption tower emptying and obtain discharging and, making the adsorption tower of winning accomplish the displacement operation through the dropping a hint of overcompression from the 6th adsorption tower emptying operation of accomplishing step-down; (5), first adsorption tower displacement back vacuumizes with vavuum pump through valve, makes the foreign gas desorb in the adsorption tower of winning; (6), after the first adsorption tower desorb, shift the displacement gas that the displacement operation of step-down gas that the step-down operation that obtains the 3rd adsorption tower discharges and the 5th adsorption tower discharges through valve and accomplish the operation of boosting, by product gas first adsorption tower is carried out pressurising again; (7), after the first adsorption tower pressurising, enter into next sorption cycle once more; (8), carry out between each adsorption tower that gas shifts and circulate one by one according to the gas separation circuit.At least six adsorption towers are accomplished gas jointly and are separated; Guarantee an operation section, each adsorption tower all has corresponding process operations, makes each operation to circulate; Six operations are respectively absorption, step-down, emptying, replace, vacuumize, boost and pressurising; Can shift the gas that needs between the adsorption tower, the content of product gas is less in the gas in the emptying operation in the adsorption tower, directly discharges the product blast and takes less; The present technique scheme is dropped a hint part to compress in the adsorption tower that is drained into corresponding needs displacement and is replaced, and can make full use of and drop a hint; Improved the impurity content in the adsorption tower after the displacement, next step vacuumizes the impurity that can obtain higher concentration; Displacement gas shifts the adsorption tower that boosts to need, has made full use of displacement gas, and makes that the impurity content in the adsorption tower that boosts is less, improves the efficient of next sorption cycle of adsorption tower; The flow direction of gas mainly is towards the adsorption tower of accomplishing corresponding operation, not necessarily arranges in order.
As preferably, each adsorption tower all accomplishes absorption, step-down, emptying successively, replace, vacuumize, boost and the circulating process of pressurising.The operation that each adsorption tower is accomplished is mainly by the valve control that connects this adsorption tower; The valve opening of corresponding operation; Can carry out the operation of this operation; Valve can have program to control, and controls such as the PLC program, and programming also is that working condition according to production needs and adsorption tower is set.
As preferably, the adsorption tower of each operation of boosting all shifts the displacement gas that the step-down gas that obtains being discharged by the step-down operation and displacement operation are discharged.Step-down gas and displacement gas have improved gas effciency as another adsorption tower usefulness of boosting, and have also improved the productive rate of product gas, have also improved adsorption effect simultaneously.
As preferably, corresponding operation of boosting charges into unstripped gas and accomplishes in first gas separation process.For the first time sorption cycle the time, do not have step-down gas and drop a hint and displacement gas, adopt unstripped gas when therefore needing input to boost, can use step-down gas and displacement gas after sorption cycle is accomplished for the first time as the gas use of boosting.
As preferably, the impurity content of dropping a hint in the emptying operation is at least more than 90%.The product gas content of the impurity gas emission loss of this high concentration is few.
As preferably, gas got into from the bottom of adsorption tower when each adsorption tower was accomplished gas and separated operation, discharged from the top of adsorption tower.The flow direction of gas all is forward mobile in the adsorption tower, so the concentration gradient of product gas in adsorption tower from low to high always from bottom to top, and the concentration of the product gas of discharging from the adsorption tower top is higher.
The invention has the beneficial effects as follows: the high concentration gas of using in the displacement operation is to be obtained after compression by dropping a hint of emptying operation discharge; The displacement gas that obtains after the displacement uses as the gas that boosts of another adsorption tower; Impurity gas in the abundant sorption cycle also obtains product gas, has improved the productive rate of product gas; The flow direction of gas all is the bottom entering from adsorption tower in each operation; Discharge from the top of adsorption tower, can not cause the concentration gradient of product gas in the adsorption tower to change, low near the product gas concentration of bottom; Product gas concentration near the top is high, and the purity of the product gas that obtains is higher.
Description of drawings
Fig. 1 is a kind of process flow sketch map of the present invention;
Fig. 2 is a kind of structural representation of the present invention;
Among the figure: 1, first adsorption tower, 2, second adsorption tower, the 3, the 3rd adsorption tower, the 4, the 4th adsorption tower, the 5, the 5th adsorption tower, the 6, the 6th adsorption tower.
The specific embodiment
Pass through specific embodiment below, and combine accompanying drawing, do further bright specifically technical scheme of the present invention.
Embodiment: a kind of gas separating method (referring to accompanying drawing 1 accompanying drawing 2) that adopts substitute mode; Have 6 adsorption towers and make up realization circulation absorption jointly; Circulation absorption comprises absorption, step-down, emptying, also pressurising totally 6 operations of replacing, vacuumize, boost; This is a circulation, repeats above-mentioned operation after the completion once more.In the same time, each adsorption tower is accomplished an operation, and carrying out absorption process with first adsorption tower 1 is example.Second adsorption tower 2 carried out step-down, the 3rd adsorption tower 3 and carried out that emptying, the 4th adsorption tower 4 are replaced, the 5th adsorption tower 5 vacuumizes, the 6th adsorption tower 6 boosts and pressurising this moment.First adsorption tower is accomplished absorption, step-down, emptying successively, is replaced, vacuumizes, boosts and the pressurising operation; Second adsorption tower is accomplished step-down, emptying successively, replace, vacuumize, boost also pressurising, absorption process, and the 3rd adsorption tower is accomplished emptying successively, replace, vacuumize, boost also pressurising, absorption, step-down operation; The 4th adsorption tower is accomplished displacement successively, also pressurising, absorption, step-down, emptying operation vacuumize, boost; The 5th adsorption tower accomplishes successively and vacuumizes, boost and pressurising, absorption, step-down, emptying, displacement operation; The 6th adsorption tower is accomplished also pressurising, absorption, step-down, the emptying of boosting successively, is replaced, vacuumizes operation.
(1), unstripped gas in valve KS101A forward gets into first adsorption tower 1, impurity is adsorbed agent absorption and obtains product gas, product gas flows out first adsorption tower through valve KS102A and gets into next workshop section;
(2), product gas index reaches production target; Adsorption process finishes; Through valve KS104A the gases at high pressure in first adsorption tower are forward transferred to the 5th adsorption tower 5 that completion vacuumizes by KS104E, make the 5th adsorption tower get into the operation of boosting, first adsorption tower is accomplished the step-down operation;
(3), its pressure also is higher than normal pressure after the first adsorption tower step-down; Then the gas in first adsorption tower 1 is discharged through valve KS106A, emptying first adsorption tower, the impurity volume content of the gas of emptying is 95%; Simultaneously with 5% the compression and transfer in second adsorption tower 2 that needs displacement of dropping a hint by KS108A; Pressure after the first adsorption tower emptying is lower than the pressure after the step-down, and first adsorption tower is when the emptying operation, and the 6th adsorption tower 6 is in the step-down operation;
(4), the laggard line replacement operation of the first adsorption tower emptying; This moment, the 6th adsorption tower was in the emptying operation; The pressure of the 6th adsorption tower is greater than the pressure in first adsorption tower; First adsorption tower shifts and to obtain that the 6th adsorption tower emptying operation is discharged and through the dropping a hint of overcompression, to make the adsorption tower of winning accomplish the displacement operation, and the displacement gas after the displacement has valve KS105A to discharge and transfer to the boost use of the 3rd adsorption tower as the 3rd adsorption tower;
(5), first adsorption tower displacement back vacuumizes with vavuum pump through valve KS107A, makes the foreign gas desorb in the adsorption tower 1 of winning;
(6), after the first adsorption tower desorb, shift the displacement gas that the displacement operation of step-down gas that the step-down operation that obtains the 3rd adsorption tower 3 discharges and the 5th adsorption tower discharges through valve KS103A and accomplish the operation of boosting, by product gas first adsorption tower is carried out pressurising again;
(7), after the first adsorption tower pressurising, enter into next sorption cycle once more by valve KS101A input unstripped gas.
Second adsorption tower, the 3rd adsorption tower, the 4th adsorption tower, the 5th adsorption tower and the 6th adsorption tower are also accomplished identical operation successively.
Above-described embodiment is a kind of preferred version of the present invention, is not the present invention is done any pro forma restriction, under the prerequisite that does not exceed the technical scheme that claim puts down in writing, also has other variant and remodeling.
Claims (6)
1. gas separating method that adopts substitute mode; Total at least 6 adsorption towers make up jointly realizes circulation absorption; In the same time, each adsorption tower is accomplished an operation, it is characterized in that comprising the steps: that (1), unstripped gas are in valve forward gets into first adsorption tower; Impurity is adsorbed agent absorption and obtains product gas, and product gas flows out first adsorption tower through valve and gets into next workshop section; (2), product gas index reaches production target, adsorption process finishes, and through valve the gases at high pressure in first adsorption tower is forward transferred to and is accomplished the 5th adsorption tower that vacuumizes, and makes the 5th adsorption tower get into the operation of boosting, first adsorption tower is accomplished the step-down operation; (3), its pressure also is higher than normal pressure after the first adsorption tower step-down, then through valve the gas in first adsorption tower is discharged, emptying first adsorption tower is simultaneously with drop a hint compression and transferring in second adsorption tower that needs displacement of part; (4), shift after the first adsorption tower emptying and obtain discharging and, making the adsorption tower of winning accomplish the displacement operation through the dropping a hint of overcompression from the 6th adsorption tower emptying operation of accomplishing step-down; (5), first adsorption tower displacement back vacuumizes with vavuum pump through valve, makes the foreign gas desorb in the adsorption tower of winning; (6), after the first adsorption tower desorb, shift the displacement gas that the displacement operation of step-down gas that the step-down operation that obtains the 3rd adsorption tower discharges and the 5th adsorption tower discharges through valve and accomplish the operation of boosting, by product gas first adsorption tower is carried out pressurising again; (7), after the first adsorption tower pressurising, enter into next sorption cycle once more; (8), carry out between each adsorption tower that gas shifts and circulate one by one according to the gas separation circuit.
2. the gas separating method of employing substitute mode according to claim 1 is characterized in that each adsorption tower is all accomplished absorption, step-down, emptying successively, the also circulating process of pressurising of replacing, vacuumize, boost.
3. the gas separating method of employing substitute mode according to claim 1 is characterized in that the adsorption tower of each operation of boosting all shifts the step-down gas and the displacement gas of replacing the operation discharge that obtains by the discharge of step-down operation.
4. according to the gas separating method of claim 1 or 2 or 3 described employing substitute modes, it is characterized in that corresponding operation of boosting charges into unstripped gas in first gas separation process to accomplish.
5. according to the gas separating method of claim 1 or 2 or 3 described employing substitute modes, the impurity content that it is characterized in that dropping a hint in the emptying operation is at least more than 90%.
6. according to the gas separating method of claim 1 or 2 or 3 described employing substitute modes, it is characterized in that gas when each adsorption tower is accomplished gas and separated operation gets into from the bottom of adsorption tower, discharges from the top of adsorption tower.
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| CN 201110264692 CN102350171B (en) | 2011-09-08 | 2011-09-08 | Method for separating gas in replacement mode |
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| CN 201110264692 CN102350171B (en) | 2011-09-08 | 2011-09-08 | Method for separating gas in replacement mode |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5906675A (en) * | 1997-09-30 | 1999-05-25 | The Boc Group, Inc. | Air purification process |
| CN101108295A (en) * | 2007-05-18 | 2008-01-23 | 刘明 | Method of removing CO2 from switch gas by pressure swing adsorption with replacing and recycling step |
| CN101301559A (en) * | 2008-06-02 | 2008-11-12 | 上海沃珅化工科技有限公司 | Pressure variable adsorption technique and apparatus thereof |
| CN101549240A (en) * | 2009-04-23 | 2009-10-07 | 天津大学 | Method containing carbon dioxide replacement for absorbing methane in condensed coal bed gas through pressure varying mode |
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2011
- 2011-09-08 CN CN 201110264692 patent/CN102350171B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5906675A (en) * | 1997-09-30 | 1999-05-25 | The Boc Group, Inc. | Air purification process |
| CN101108295A (en) * | 2007-05-18 | 2008-01-23 | 刘明 | Method of removing CO2 from switch gas by pressure swing adsorption with replacing and recycling step |
| CN101301559A (en) * | 2008-06-02 | 2008-11-12 | 上海沃珅化工科技有限公司 | Pressure variable adsorption technique and apparatus thereof |
| CN101549240A (en) * | 2009-04-23 | 2009-10-07 | 天津大学 | Method containing carbon dioxide replacement for absorbing methane in condensed coal bed gas through pressure varying mode |
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