CN1202899C - Multistage sweeping process - Google Patents
Multistage sweeping process Download PDFInfo
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- CN1202899C CN1202899C CN 00110081 CN00110081A CN1202899C CN 1202899 C CN1202899 C CN 1202899C CN 00110081 CN00110081 CN 00110081 CN 00110081 A CN00110081 A CN 00110081A CN 1202899 C CN1202899 C CN 1202899C
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Abstract
The present invention relates to a multi-stage sweeping flow path which is characterized in that the flow path is composed of N levels of membrane assemblies, and the N is equal to 2 to 10; the raw gas of each level of the membrane assemblies is divided into two paths, one path of gas enters from the high-pressure side of the membrane assembly, and the other path of gas enters from the low-pressure side of the membrane assembly; the tail gas of the level is used as the raw gas of the next level, the permeation gas of the next level enters the low-pressure side of the level, and a product gas is used as the permeation gas of the first level. When the present invention completes the same design requirement, the number of the required membrane assemblies is less than that of the traditional flow path, and the operation is flexible simultaneously.
Description
The present invention relates to membrane separation technique, a kind of multistage sweeping process is provided 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 multistage sweeping 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 multistage sweeping process, it is characterized in that: flow process is made of N level membrane module, N=2～10, the unstripped gas of every grade of membrane module is divided into two-way, one route membrane module high-pressure side enters, and a route membrane module low-pressure side enters, and the tail gas of this grade is as the unstripped gas of next stage, the infiltration gas of next stage enters the low-pressure side of this grade, and product gas is the infiltration gas of the first order.
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 membrane module unstripped gas enter this grade 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 is a multistage sweeping process.
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, flow process is made of 3 grades of membrane modules, the unstripped gas of every grade of membrane module is divided into two-way, one route membrane module high-pressure side enters, one route membrane module low-pressure side enters, and the tail gas of this grade is as the unstripped gas of next stage, and the infiltration gas of next stage enters the low-pressure side of this grade, product gas is the infiltration gas of the first order, wherein first order membrane area 5m
2, second level membrane area 6m
2, third level membrane area 79m
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 is illustrated in figure 1 as the synthetic ammonia relief gas hydrogen recovery process of tradition, 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. multistage sweeping process, it is characterized in that: flow process is made of N level membrane module, N=2～10, the unstripped gas of every grade of membrane module is divided into two-way, one route membrane module high-pressure side enters, and a route membrane module low-pressure side enters, and the tail gas of this grade is as the unstripped gas of next stage, the infiltration gas of next stage enters the low-pressure side of this grade, and product gas is the infiltration gas of the first order.
2. according to the described multistage sweeping process 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 00110081 CN1202899C (en) | 2000-01-28 | 2000-01-28 | Multistage sweeping process |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 00110081 CN1202899C (en) | 2000-01-28 | 2000-01-28 | Multistage sweeping process |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1306879A CN1306879A (en) | 2001-08-08 |
| CN1202899C true CN1202899C (en) | 2005-05-25 |
Family
ID=4580101
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 00110081 Expired - Fee Related CN1202899C (en) | 2000-01-28 | 2000-01-28 | Multistage sweeping process |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1202899C (en) |
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2000
- 2000-01-28 CN CN 00110081 patent/CN1202899C/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| CN1306879A (en) | 2001-08-08 |
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