CN1202898C - Two-stage process with intermediate gas sweeping - Google Patents
Two-stage process with intermediate gas sweeping Download PDFInfo
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- CN1202898C CN1202898C CN 00110079 CN00110079A CN1202898C CN 1202898 C CN1202898 C CN 1202898C CN 00110079 CN00110079 CN 00110079 CN 00110079 A CN00110079 A CN 00110079A CN 1202898 C CN1202898 C CN 1202898C
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Abstract
The present invention relates to a two-stage process with intermediate gas sweeping, which is characterized in that raw gas enters from the high-pressure end of a first stage membrane module, first stage tail gas is divided into two paths, one path enters the high-pressure side of a second stage membrane module, the other path enters the low-pressure side of the second stage membrane module, the osmosis gas of the second stage membrane module enters the low-pressure side of the first stage membrane module, and product gas is the osmosis gas of the first stage membrane module. When the present invention accomplishes the same design requirement, the required membrane modules are less than those of the traditional process, and meanwhile, the present invention has flexible operation.
Description
The present invention relates to membrane separation technique, provide a kind of intermediate gas to purge two-stage process especially.
Desirable stage theory has been experienced in the research of flow scheme design, optimization method and principle, continuous film post theory, a series of processes such as circulated in countercurrent stage theory.Along with the raising of membrane module separating property, some simple multistage flow processs just are being subjected to more and more researchers' attention at present.Because membrane module separating property in the past is lower, therefore in order to reach higher separation requirement, when flow scheme design, separating property how to give full play to membrane module becomes an important design philosophy.But, in flow scheme design the membrane module separating property to demonstrate fully often to sacrifice permeance property be cost.As a simple two-stage process (this flow process often is used to the higher separation process of product gas concentration requirement), because total pressure differential equals the pressure differential sum of membrane modules at different levels, therefore the pressure differential of each grade membrane module has reduced, the infiltration capacity of this grade has also reduced, thereby causes the permeance property of membrane module to be not in full use in this flow process.Prassad is at US Pat5 in 1992, proposed three grades of flow processs that prepare extreme high purity nitrogen with air in 102,432.In this flow process, distribute by the membrane area of adjusting three grades of membrane modules, nitrogen gas concn can reach 99%～99.999%.This flow process reduces required membrane module quantity by increasing compressor or compressor power consumption.Prassad is also at US Pat5 in 1993, proposed a two-stage process for preparing oxygen rich air with air in 185,014, in this flow process, partly or entirely raw air is entered by second level per-meate side, and second level infiltration gas is introduced into first order high-pressure side, and product gas is first order infiltration gas.Because the oxygen concentration of second level infiltration gas is greater than airborne oxygen concentration, therefore can improve product gas concentration as the unstripped gas of the first order with second level infiltration gas.Xu is at US Pat5 in 1993, proposed a secondary gas film separation process in 282,969, and this flow process is used for the fast gas concentration of unstripped gas when low, and fast gas is put forward dense process, and the oxygen enrichment process is one of them application example.This flow process is to utilize second level per-meate side light concentration gas to purge first order per-meate side, to reduce first order per-meate side concentration, improves the mass transfer force of the fast gas in film both sides, thereby reaches the purpose that increases the fast impervious amount of the first order.Xu is also at USPat5 in 1994, proposed three grades of gas film separation process in 306,427, and this flow process is used for the fast gas concentration of unstripped gas when low, and fast gas is put forward dense process, and the oxygen enrichment process is one of them application example.This flow process has increased a gas enrichment section slowly on stream, and promptly stripping section is further purified the concentration of gas slowly in the non-infiltration gas.Can making slowly by this flow process, gas, fast gas obtain enrichment simultaneously in separation process.At present, along with the development of membrane separation technique, the separating property of membrane module is greatly improved, and in flow scheme design, permeance property how to give full play to membrane module has become important research project, and the research report of relevant this respect also seldom.Give full play to the permeance property of membrane module, under most economical condition, realize designing requirement, engineering design is had important and practical meanings.
The object of the present invention is to provide a kind of intermediate gas to purge two-stage process, it is when finishing identical designing requirement, and required membrane module quantity is less than traditional process, also has more flexibility in the operation simultaneously.
The invention provides a kind of intermediate gas and purge two-stage process, it is characterized in that: unstripped gas enters from the high-pressure side of one-level membrane module, one-level tail gas divides two-way, one the tunnel enters the second membrane module high-pressure side, one the tunnel enters the second membrane module low-pressure side, the infiltration gas of second membrane module enters one-level membrane module low-pressure side, and product gas is one-level membrane module infiltration gas.
Flow process mesohigh side of the present invention and low-pressure side gas flow can be and stream or adverse current or cross-flow.
The present invention makes part one-level membrane module tail gas enter second membrane module membrane module low-pressure side, has reduced the concentration of this side gas, has improved the mass transfer force of film both sides gases, has increased the flow of gas by film, has promptly increased the product throughput.When the product throughput is certain, this flow process can reduce membrane module quantity.
It is higher that the present invention is specially adapted to the membrane module separation, and product gas is the separation process of infiltration gas, as: synthetic ammonia relief gas hydrogen recovery process; Film oxygen enriching process etc.
Below by embodiment in detail the present invention is described in detail.
Accompanying drawing 1 purges two-stage process for intermediate gas.
Accompanying drawing 2 is that the synthetic ammonia relief gas hydrogen of tradition reclaims single-stage process flow.
Embodiment
Synthetic ammonia relief gas hydrogen recovery process flow scheme design as shown in Figure 1, unstripped gas enters from the high-pressure side of one-level membrane module, one-level tail gas divides two-way, one the tunnel enters the second membrane module high-pressure side, one the tunnel enters the second membrane module low-pressure side, the infiltration gas of second membrane module enters one-level membrane module low-pressure side, and product gas is one-level membrane module infiltration gas, and one-level membrane module membrane area is 10m
2, the second membrane module membrane area is 83m
2Used membrane module hydrogen infiltration coefficient 5.0 * 10
-5Cm
3(STP)/cm
2S cmHg, separation 50; Adopt unstripped gas hydrogen concentration 0.6, raw gas flow 1000m
3(STP)/and hr, feed side pressure 11MPa, osmotic lateral pressure 2MPa, gained final products gas hydrogen yield 0.85, product gas hydrogen concentration 0.85.
Comparative example
Flow process tradition is as shown in Figure 1 synthesized ammonia relief gas hydrogen recovery process, the same embodiment of used membrane module, i.e. membrane module hydrogen infiltration coefficient 5.0 * 10
-5Cm
3(STP)/cm
2S cmHg, separation 50; Adopt same unstripped gas and operating parameter, promptly the unstripped gas hydrogen concentration 0.6, raw gas flow 1000m
3(STP)/and hr, feed side pressure 11MPa, osmotic lateral pressure 2MPa, when final products were same identical with embodiment, promptly product gas hydrogen yield 0.85, product gas hydrogen concentration 0.85; Required membrane area is 155m
2, high more a lot of than the required total membrane area of embodiment.
Claims (2)
1, a kind of intermediate gas purges two-stage process, it is characterized in that: unstripped gas enters from the high-pressure side of one-level membrane module, one-level tail gas divides two-way, one the tunnel enters the second membrane module high-pressure side, one the tunnel enters the second membrane module low-pressure side, the infiltration gas of second membrane module enters one-level membrane module low-pressure side, and product gas is one-level membrane module infiltration gas.
2, purge two-stage process according to the described intermediate gas of claim 1, it is characterized in that: high-pressure side and low-pressure side gas flow are and stream or adverse current or cross-flow.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 00110079 CN1202898C (en) | 2000-01-28 | 2000-01-28 | Two-stage process with intermediate gas sweeping |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 00110079 CN1202898C (en) | 2000-01-28 | 2000-01-28 | Two-stage process with intermediate gas sweeping |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1306878A CN1306878A (en) | 2001-08-08 |
| CN1202898C true CN1202898C (en) | 2005-05-25 |
Family
ID=4580100
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 00110079 Expired - Fee Related CN1202898C (en) | 2000-01-28 | 2000-01-28 | Two-stage process with intermediate gas sweeping |
Country Status (1)
| Country | Link |
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| CN (1) | CN1202898C (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101850209B (en) * | 2010-06-08 | 2012-08-22 | 中煤能源黑龙江煤化工有限公司 | Vent gas treatment method and treatment device |
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2000
- 2000-01-28 CN CN 00110079 patent/CN1202898C/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| CN1306878A (en) | 2001-08-08 |
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