CN102423602A - Gas separation technology of series adsorption - Google Patents
Gas separation technology of series adsorption Download PDFInfo
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- CN102423602A CN102423602A CN2011102646861A CN201110264686A CN102423602A CN 102423602 A CN102423602 A CN 102423602A CN 2011102646861 A CN2011102646861 A CN 2011102646861A CN 201110264686 A CN201110264686 A CN 201110264686A CN 102423602 A CN102423602 A CN 102423602A
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Abstract
The invention relates to a gas separation technology of series adsorption, and product gas emitted from an adsorption tower of the technology always maintains high concentration. The technology solves a defect of low product gas purity caused by emission of product gas after one time adsorption of gas by the adsorption tower. At least six adsorption towers are combined to realize recycling adsorption; each adsorption tower complete one operation at the same time; feed gas enters a first adsorption tower adsorption tower consequently from a valve, and impurities are absorbed by adsorbent to obtain intermediate gas; the intermediate gas flows out from the valve and flows to a second adsorption tower; impurities are absorbed by adsorbent in the second adsorption tower to obtain a product gas; the product gas flows out of the second adsorption tower from a valve and enters a next section. The feed gas is absorbed once to obtain the intermediate gas, which is absorbed again to obtain the product gas with a high purity.
Description
Technical field
The present invention relates to a kind of gas separating technology, the product gas that especially a kind of adsorption tower is discharged remains the series adsorption gas separating technology of high concentration.
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 drop pressure 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.
Existing gas fractionation unit all is that an adsorption tower completion absorption back product gas discharge is soon perhaps stored in divided gas flow; Then this adsorption tower is carried out the work disposal of postorder; This suction type causes the product gas of discharge owing to receive the influence of the adsorbent in the adsorption tower; Impurity content in the product gas is more, can't obtain the high product gas of purity.
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, first, second absorber is done adverse current emptying; 4, with the clean gas in the reservoir to first, second absorber part supercharging; Repeating step 1-4 then.Though obtain the product gas of higher degree through twice absorption, accomplish once absorption after, first, second absorber is done adverse current emptying, makes product gas that second absorber contains simultaneously by emptying, causes product blast expense, has reduced the productive rate of product gas.
Summary of the invention
The invention solves in the prior art gas absorption and just discharge product gas through an adsorption tower and cause the not high defective of purity of product gas, provide a kind of and carry out the series adsorption gas separating technology that energy of adsorption obtains the product gas of higher degree through two adsorption towers continuously.
The present invention has also solved and in the prior art adsorption tower through twice absorption has been carried out adverse current emptying; Can take away the defective that the product gas that is in first adsorption tower reduces product gas productive rate simultaneously; Provide a kind of through twice absorption; And the residue gas in the adsorption tower forward transferred to another adsorption tower, improved the series adsorption gas separating technology that adsorption effect increases product purity.
The technical solution adopted for the present invention to solve the technical problems is: a kind of series adsorption gas separating technology; 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 is in valve forward gets into first adsorption tower; Impurity is adsorbed agent absorption and obtains middle gas; Middle gas flows out through valve and flows to second adsorption tower, and impurity is adsorbed agent absorption and obtains product gas in second adsorption tower, and product gas flows out second adsorption tower and gets into next workshop section through valve; Gas in (2) first adsorption towers is through flow direction valve second adsorption tower; First adsorption tower begins step-down; The pressure cyclostrophic is moved on in other adsorption tower that need boost, and impurity is adsorbed agent absorption and obtains middle gas in second adsorption tower, and middle gas flows out through valve and also flows to the 3rd adsorption tower; Impurity is adsorbed agent absorption and obtains product gas in the 3rd adsorption tower, and product gas flows out the 3rd adsorption tower and gets into next workshop section through valve; Gas in (3) second adsorption towers is through flow direction valve the 3rd adsorption tower; Second adsorption tower begins step-down, and the pressure cyclostrophic is moved on in other adsorption tower that need boost, and first adsorption tower begins emptying; Impurity is adsorbed agent absorption and obtains middle gas in the 3rd adsorption tower; Middle gas flows out through valve and flows to the 4th adsorption tower, and impurity is adsorbed agent absorption and obtains product gas in the 4th adsorption tower, and product gas flows out into next workshop section through valve; Gas in (4) the 3rd adsorption towers is through flow direction valve the 4th adsorption tower; The 3rd adsorption tower begins step-down, and second adsorption tower begins emptying, and first adsorption tower begins to vacuumize desorb; Impurity is adsorbed agent absorption and obtains middle gas in the 4th adsorption tower; Middle gas is through the valve outflow and flow to the 5th adsorption tower, and impurity is adsorbed agent absorption and obtains product gas in the 5th adsorption tower, and product gas flows out into next workshop section through valve; Gas in (5) the 4th adsorption towers is through flow direction valve the 5th adsorption tower, and the 4th adsorption tower begins step-down, and the 3rd adsorption tower begins emptying; Second adsorption tower begins to vacuumize desorb; First adsorption tower begins to boost, and impurity is adsorbed agent absorption and obtains middle gas in the 5th adsorption tower, and middle gas flows out through valve and also flows to the 6th adsorption tower; Impurity is adsorbed agent absorption and obtains product gas in the 6th adsorption tower, and product gas flows out into next workshop section through valve; Gas in (6) the 5th adsorption towers is through flow direction valve the 6th adsorption tower; The 5th adsorption tower begins step-down, and the 4th adsorption tower begins emptying, and the 3rd adsorption tower begins to vacuumize desorb; Second adsorption tower begins to boost; The final pressurising of first adsorption tower, impurity is adsorbed agent absorption and obtains middle gas in the 6th adsorption tower, and middle gas is accomplished first adsorption tower of final pressurising through flow direction valve; Impurity is adsorbed agent absorption and obtains product gas in first adsorption tower, and product gas escapes and enter next workshop section through valve; (7) so repeat to accomplish above-mentioned steps 1-6, finally accomplish the unstripped gas separation and obtain product gas.At least six adsorption towers are accomplished gas jointly and are separated, and guarantee an operation section, and each adsorption tower all has the process operations of correspondence, makes each operation to circulate, and six operations are respectively absorption, step-down, emptying, vacuumize, boost, pressurising; Unstripped gas through the content of impurity in the middle gas that obtains after the absorption once generally 5%; The content of impurity is generally 1% in the product gas that middle gas obtains through absorption for the second time, and the purity of the product gas that obtains through twice absorption is far above the purity of the product gas that obtains through absorption once; Middle gas constantly shifts between each adsorption tower, makes unstripped gas always through the two-stage absorption of series connection, and the purity of the product gas that obtains is higher; The process series connection is shifted, and in the absorption process, the middle gas that first order adsorption tower produces can be used as the source gas that boosts again, improves in next gas separating cycle the content of product gas in the adsorption tower, the productive rate of raising product gas.
As preferably, each adsorption tower all once accomplishes absorption, step-down, emptying, vacuumize, boost and the circulating process of final 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 and obtains the step-down gas of being discharged by the step-down operation.Step-down gas belongs to the middle gas that the first order absorption in the series adsorption is accomplished, and step-down gas contains more product gas, as the gas that boosts, can improve the content of product gas in next gas separation, improves separating effect; The operation that correspondence is boosted in first gas separation process charges into unstripped gas and accomplishes; For the first time sorption cycle the time, do not have step-down gas, adopt unstripped gas in the time of therefore need boosting, can use step-down gas to use after sorption cycle is accomplished for the first time as the gas that boosts.
As preferably, the high pressure gas that needs in the pressurising operation is a product gas.Product gas carries out punching press, charges into unstripped gas during next absorption process and can obtain the higher relatively middle gas of purity, improves the purity of the product gas that obtains after the absorption of the second level.
As preferably, gas got into from the bottom of adsorption tower when each adsorption tower was accomplished each 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: unstripped gas is through gas in the middle of once absorption obtains, and middle gas just obtains product gas through absorption once more, makes the purity of product gas can reach higher; Absorption process constantly shifts between each adsorption tower, makes the concentration of the middle gas that absorption for the first time obtains keep stable, and it is stable that the purity of product gas keeps, and it is stable that the distribution of gas gradient in the adsorption tower keeps.
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 series adsorption gas separating technology (referring to accompanying drawing 1 accompanying drawing 2); Total at least 6 adsorption towers make up jointly realizes circulation absorption; Be respectively first adsorption tower 1, second adsorption tower 2, the 3rd adsorption tower 3, the 4th adsorption tower 4, the 5th adsorption tower 5 and the 6th adsorption tower 6; In the same time, each adsorption tower is accomplished an operation, and six operations respectively are absorption, step-down, emptying, vacuumize, boost and punching press.
Series adsorption is an example with the first adsorption tower absorption process, and at this moment, second adsorption tower is in punching press, and the 3rd adsorption tower is boosting, and the 4th adsorption tower is vacuumizing, and the 5th adsorption tower is in emptying, and the 6th adsorption tower is in step-down.Comprise the steps: that (1) unstripped gas is in valve KS101A forward gets into first adsorption tower 1; Impurity is adsorbed agent absorption and obtains middle gas; This moment, second adsorption tower 2 carried out punching course, and stamping procedure adopts product gas to get into from valve KS105B, and middle gas is through valve KS102A outflow and flow to second adsorption tower 2; Impurity is adsorbed agent absorption and obtains product gas in second adsorption tower, and product gas flows out second adsorption tower and gets into next workshop section through valve KS104B; Gas in (2) first adsorption towers flows to second adsorption tower through valve KS102A; First adsorption tower begins step-down; Pressure gas is transferred to through valve KS106A in the 4th adsorption tower 4 that need boost, and impurity is adsorbed agent absorption and obtains middle gas in second adsorption tower, and middle gas flows out through valve KS102B and also flows to the 3rd adsorption tower 3; Impurity is adsorbed agent absorption and obtains product gas in the 3rd adsorption tower, and product gas flows out the 3rd adsorption tower 3 and gets into next workshop section through valve KS104C; Gas in (3) second adsorption towers is through flow direction valve the 3rd adsorption tower; Second adsorption tower begins step-down; The pressure cyclostrophic is moved on in the 5th adsorption tower 5 that need boost by valve KS106B, this moment, the 1 beginning emptying of first adsorption tower was discharged by valve KS107A; Impurity is adsorbed agent absorption and obtains middle gas in the 3rd adsorption tower 3; Middle gas flows out through valve KS102C and flows to the 4th adsorption tower 4, and impurity is adsorbed agent absorption and obtains product gas in the 4th adsorption tower, and product gas flows out into next workshop section through valve KS104D; Gas in (4) the 3rd adsorption towers flows to the 4th adsorption tower through valve KS102C, and the 3rd adsorption tower begins step-down, gas is transferred to the 6th adsorption tower 6 that need boost by valve KS106C; Second adsorption tower begins emptying; Discharged by valve KS107B, first adsorption tower begins to vacuumize desorb, is discharged by valve KS108A; Impurity is adsorbed agent absorption and obtains middle gas in the 4th adsorption tower; Middle gas is through valve KS102D outflow and flow to the 5th adsorption tower 5, and impurity is adsorbed agent absorption and obtains product gas in the 5th adsorption tower, and product gas flows out into next workshop section through valve KS104E; Gas in (5) the 4th adsorption towers flows to the 5th adsorption tower through valve KS102D, and the 4th adsorption tower begins step-down, gas is transferred to first adsorption tower that need boost by valve KS106D; The 3rd adsorption tower begins emptying, is discharged by valve KS107C, and second adsorption tower begins to vacuumize desorb; Discharge by valve KS108B; First adsorption tower begins to boost, and impurity is adsorbed agent absorption and obtains middle gas in the 5th adsorption tower, and middle gas flows out through valve KS102E and also flows to the 6th adsorption tower 6; Impurity is adsorbed agent absorption and obtains product gas in the 6th adsorption tower, and product gas flows out into next workshop section through valve KS104F; Gas in (6) the 5th adsorption towers flows to the 6th adsorption tower through valve KS102E, and the 5th adsorption tower begins step-down, gas is transferred to second adsorption tower that need boost by valve KS106E; The 4th adsorption tower begins emptying, is discharged by valve KS107D, and the 3rd adsorption tower begins to vacuumize desorb; Discharge by valve KS108C; Second adsorption tower begins to boost, and the final pressurising of first adsorption tower obtains product gas by valve KS105A; Impurity is adsorbed agent absorption and obtains middle gas in the 6th adsorption tower; Middle gas flows to first adsorption tower of accomplishing final pressurising through valve KS102F, and impurity is adsorbed agent absorption and obtains product gas in first adsorption tower, and product gas escapes and enter next workshop section through valve KS104A; (7) so repeat to accomplish above-mentioned steps 1-6, finally accomplish the unstripped gas separation and obtain product gas.
In the absorption transfer process, middle gas forward gets into from the bottom of adsorption tower, and product gas is discharged at the top.
The series adsorption process shifts between six adsorption towers in order, and each adsorption tower is accomplished corresponding operation separately.
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 (5)
1. series adsorption gas separating technology; 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 is in valve forward gets into first adsorption tower; Impurity is adsorbed agent absorption and obtains middle gas; Middle gas flows out through valve and flows to second adsorption tower, and impurity is adsorbed agent absorption and obtains product gas in second adsorption tower, and product gas flows out second adsorption tower and gets into next workshop section through valve; Gas in (2) first adsorption towers is through flow direction valve second adsorption tower; First adsorption tower begins step-down; The pressure cyclostrophic is moved on in other adsorption tower that need boost, and impurity is adsorbed agent absorption and obtains middle gas in second adsorption tower, and middle gas flows out through valve and also flows to the 3rd adsorption tower; Impurity is adsorbed agent absorption and obtains product gas in the 3rd adsorption tower, and product gas flows out the 3rd adsorption tower and gets into next workshop section through valve; Gas in (3) second adsorption towers is through flow direction valve the 3rd adsorption tower; Second adsorption tower begins step-down, and the pressure cyclostrophic is moved on in other adsorption tower that need boost, and first adsorption tower begins emptying; Impurity is adsorbed agent absorption and obtains middle gas in the 3rd adsorption tower; Middle gas flows out through valve and flows to the 4th adsorption tower, and impurity is adsorbed agent absorption and obtains product gas in the 4th adsorption tower, and product gas flows out into next workshop section through valve; Gas in (4) the 3rd adsorption towers is through flow direction valve the 4th adsorption tower; The 3rd adsorption tower begins step-down, and second adsorption tower begins emptying, and first adsorption tower begins to vacuumize desorb; Impurity is adsorbed agent absorption and obtains middle gas in the 4th adsorption tower; Middle gas is through the valve outflow and flow to the 5th adsorption tower, and impurity is adsorbed agent absorption and obtains product gas in the 5th adsorption tower, and product gas flows out into next workshop section through valve; Gas in (5) the 4th adsorption towers is through flow direction valve the 5th adsorption tower, and the 4th adsorption tower begins step-down, and the 3rd adsorption tower begins emptying; Second adsorption tower begins to vacuumize desorb; First adsorption tower begins to boost, and impurity is adsorbed agent absorption and obtains middle gas in the 5th adsorption tower, and middle gas flows out through valve and also flows to the 6th adsorption tower; Impurity is adsorbed agent absorption and obtains product gas in the 6th adsorption tower, and product gas flows out into next workshop section through valve; Gas in (6) the 5th adsorption towers is through flow direction valve the 6th adsorption tower; The 5th adsorption tower begins step-down, and the 4th adsorption tower begins emptying, and the 3rd adsorption tower begins to vacuumize desorb; Second adsorption tower begins to boost; The final pressurising of first adsorption tower, impurity is adsorbed agent absorption and obtains middle gas in the 6th adsorption tower, and middle gas is accomplished first adsorption tower of final pressurising through flow direction valve; Impurity is adsorbed agent absorption and obtains product gas in first adsorption tower, and product gas escapes and enter next workshop section through valve; (7) so repeat to accomplish above-mentioned steps 1-6, finally accomplish the unstripped gas separation and obtain product gas.
2. series adsorption gas separating technology according to claim 1 is characterized in that each adsorption tower all once accomplishes absorption, step-down, emptying, vacuumizes, boosts and the circulating process of final pressurising.
3. series adsorption gas separating technology according to claim 1 is characterized in that the adsorption tower of each operation of boosting all shifts the step-down gas that obtains by the discharge of step-down operation.
4. according to claim 1 or 2 or 3 described series adsorption gas separating technologies, the high pressure gas that it is characterized in that needs in the pressurising operation is a product gas.
5. according to claim 1 or 2 or 3 described series adsorption gas separating technologies, it is characterized in that gas was discharged from the top of adsorption tower from the bottom entering of adsorption tower when each adsorption tower was accomplished each operation.
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| CN 201110264686 CN102423602B (en) | 2011-09-08 | 2011-09-08 | Gas separation technology of series adsorption |
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| CN 201110264686 CN102423602B (en) | 2011-09-08 | 2011-09-08 | Gas separation technology of series adsorption |
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| CN102423602B CN102423602B (en) | 2013-04-17 |
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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 201110264686 patent/CN102423602B/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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