阅读说明：本技术 具有旋转固定的偏转盘的膜袋组件 (Membrane bag assembly with rotationally fixed deflection disc ) 是由 卡斯滕·朔勒斯 于 2019-09-12 设计创作，主要内容包括：本发明涉及膜组件,尤其是膜袋组件,包括设置在壳体中的膜袋叠件,所述壳体具有至少一个进料入口,至少一个渗余物出口和至少一个渗透物出口。本发明还涉及所述膜组件用于分离液体和/或气体混合物的用途。已知类型的膜,也称GS组件,包括壳体,其通过两端的精整盘形成容器内部空间,并以压力密封的方式封闭。所述精整盘包括至少一个进料入口,至少一个渗余物出口和一个渗透出口,至少一个膜袋叠件设置在容器内部空间,所述膜袋叠件具有多个膜袋,其彼此对齐、通过密封相互分开并且推压配合到渗透管。所述渗透管突出超过所述精整盘的至少一个渗透物出口。本发明的膜组件的特征在于,所述渗透管和精整盘的渗透物出口通过键槽连接以交合方式对齐。(The present invention relates to membrane modules, in particular membrane bag modules, comprising a membrane bag stack arranged in a housing having at least one feed inlet, at least one retentate outlet and at least one permeate outlet. The invention also relates to the use of the membrane module for separating liquid and/or gas mixtures. A membrane of known type, also called GS assembly, comprises a casing which forms the container internal space with a finishing disk at both ends and is closed in a pressure-tight manner. The finishing tray includes at least one feed inlet, at least one retentate outlet, and one permeate outlet, at least one membrane bag stack disposed in the vessel interior space, the membrane bag stack having a plurality of membrane bags aligned with one another, separated from one another by seals, and push-fitted to the permeate tube. The permeate tube protrudes beyond the at least one permeate outlet of the finishing disk. The membrane module of the invention is characterized in that the permeate outlets of the permeate tube and the finishing disk are aligned in a congruent manner by a splined connection.)

1. A membrane assembly (1) comprising a housing (2) forming a container interior space with a finishing disc (4) at both ends, closed in a pressure-tight manner, and the finishing disc (4) comprising at least one feed inlet (41), at least one retentate outlet and at least one permeate outlet (33), wherein at least one membrane bag stack is arranged in the container interior space, said membrane bag stack having a plurality of membrane bags which are aligned with one another, separated from one another by seals and push-fitted to a permeation tube (3), wherein the permeation tube protrudes beyond the at least one permeate outlet (33) of the finishing disc, characterized in that the permeation tube (3) and the finishing disc (4) are aligned in an interfitting manner at the permeate outlets of the permeation tube (3) and the finishing disc (4) by means of a splined connection.

2. Membrane module (1) according to claim 1, characterized in that the membrane bag stack further comprises a deflection disc (5) which is push-fitted onto the permeate tube (3) by means of a central hole, wherein the deflection disc (5) has grooves in each case for guiding the feed stream in a meandering feed stream from at least one feed inlet (41) to at least one retentate outlet, wherein the permeate tube (3) and the deflection disc (5) are also aligned in an overlapping manner by a splined connection.

3. The membrane module (1) according to claim 1 or 2, characterized in that at least one groove is provided in the permeate tube (3) and at least one guide key (42) is provided in each case at the permeate outlet of the finishing disk (4) and, if present, at least one guide key (52) is provided in each case at the central hole of the deflection disk (5).

4. A membrane module (1) according to claim 3, characterized in that two grooves are provided in the permeate tube (3) and two guide keys (42,52) are provided in each case at the permeate outlet of the finishing disk (4) and, if present, at the central hole of the deflection disk (5), the two guide keys (42,52) being offset by 180 °.

5. Use of a membrane module (1) according to one of the preceding claims for separating mixtures of liquids and/or gases.

6. Use according to claim 5 to reduce emissions on the breathing line of a tank.

Technical Field

The present invention relates to membrane modules, in particular membrane bag modules, comprising a membrane bag stack arranged in a housing having at least one feed inlet, at least one retentate outlet and at least one permeate outlet. The invention also relates to the use of the membrane module according to the invention for separating mixtures of liquids and/or gases.

Background

Before being used in a process, the membrane must be inserted into a module that has a specific purpose and is capable of practical operation. The membrane structure so formed is referred to as a membrane module. The feed stream (feed) in the membrane module is separated into a concentrate stream (retentate) and a filtrate stream (permeate).

In separation and enrichment techniques, flat sheet membranes of the bag type are used in particular. In the case of bag-type membranes (also known as pillow membranes), two separate flat sheets of membrane are provided with a spacer therebetween and a bag (pillow) is formed around them by welding or bonding. A hole in the center of the membrane bag enables permeate to be discharged from the interior region of the membrane bag in the direction of a permeate tube which is pushed in through the hole in a fitting manner. The stack of bags used to form the module is typically arranged in an overlapping manner using annular seals so that the retentate does not enter the permeate tube.

A membrane bag fitted around the permeate tube is mounted in a housing, wherein feed can flow around the membrane bag. The permeate of the bag dissipates towards the inside towards the center and is discharged through a permeate tube which projects at both ends beyond the finishing disk of the housing surrounding the membrane bag and is flange-fitted onto said finishing disk by means of a permeate cap. In the case of a GS bag module, the feed preferably flows in a meandering manner around the membrane bag, caused by deflection discs which are additionally incorporated in the membrane module and subdivide the membrane module into sub-sections (compartment areas).

Such a GS bag module is described in DE-PS 3507908, which is hereby incorporated by reference in its entirety, wherein the membrane is surrounded by a housing with two end plates, stacked in a spaced relationship to each other, and having a central inner bore in which a permeate tube is fittingly inserted. The end plate (finishing disc) closes the housing in a sealed manner at the ends and has a feed line for the feed stream, a discharge line for the retentate stream and at least one central discharge line for the permeate stream (fig. 9). Deflection disks incorporated in the membrane stack induce a tortuous flow around the membrane bags by the feed.

the construction of this type of GS bag module is further described in T.Melin, R.Rautenbach, Membranverfahren-Grundling der Module-und Anagenaussleung ", 3. autof., 2007Seiten 170bis 172und Abb.5.22 (Membrane methods-Fundamentals in the design of modules and systems, 3. Rautenbach, 3.Aufl., 3^rdedition,2007, pages 170to 172and FIG.5.22) and V.Nitsche et al, Abtrennung organischermit membrane ", Chemie Ingenieur Technik (70), suite 515, Abb.3, (,, Separation of organic vacuums using membranes", Chemie Ingenieur Technik (70), page 515, FIG.3), both of which are incorporated herein by reference in their entirety.

To manufacture the membrane bag module, the permeate tube is first attached to one finishing disk for the housing, the bag membrane and deflection disk stack is bonded to the permeate tube and in the housing, joined to the housing, and attached to a second finishing disk. The deflection disk in the bag film and the housing is then compressed to a predetermined size by means of a press. The permeate tube protruding beyond the finishing disk is fixed to the finishing disk by means of a permeate cap and the pressure of the press is released. A press is required to ensure tortuous flow around the film bag.

The permeation cap that secures the permeation tube and finishing disk to each other can loosen during operation. In the case of known GS membrane modules, disadvantageously, the finishing disk rotates the membrane stack and the deflection disk when the permeation cap is retightened, which is caused by the rotation of the finishing disk, resulting in a loss of efficiency until the membrane is rendered useless. Moreover, the film bag cannot be replaced without a press.

It is an object of the present invention to provide a membrane module of the type mentioned at the outset, in which the membrane bags can be replaced in a simple manner. This object is achieved by a membrane module according to claim 1. Preferred embodiments are set forth in the dependent claims.

Summary of The Invention

Membrane modules of the previously known type comprise a housing which serves to form a vessel interior space by means of a two-end-side finishing disk and is closed in a pressure-tight manner. The finishing tray comprises at least one feed inlet, at least one retentate outlet and one permeate outlet, at least one membrane bag stack having a plurality of membrane bags being arranged in the interior space of the vessel, while the membrane bags are aligned with each other, separated from each other by seals and press-fitted to the permeate tube. The permeate tube protrudes beyond the at least one permeate outlet of the finishing disk. The membrane module according to the invention is characterized in that the permeate outlets of the permeate tube and the finishing disk are aligned in a congruent manner by a splined connection.

According to one embodiment of the invention, the membrane bag stack further comprises deflection discs which are push-fitted to the permeate tube by means of a central hole, wherein the deflection discs each have grooves for guiding the feed stream in a meandering feed stream from the at least one feed opening 41 to the at least one retentate outlet, and the permeate tube and the deflection discs are aligned in an overlapping manner, again by a splined connection. The deflection disc subdivides the membrane bag stack into compartment areas. According to a preferred embodiment, the number of membrane pockets in the compartment area subdivided by the deflection disc decreases in the direction from the at least one feed inlet to the at least one retentate outlet. According to another embodiment of the invention, the stage divider disks are also fixed to the permeate tube. The stage divider disks may be secured to the permeate tube, for example, by internal threading or by a threaded fit by welding. The stage divider disk subdivides the housing into two sections which can be provided with different membrane stacks from respective opposite sides. However, the segments may also be provided with a membrane stack on one side, so that one side of the segment remains unutilized. The stage divider disks are preferably closed on the inside so that different permeate streams can be discharged at different ends of the permeate tube.

According to another embodiment of the invention, at least one groove is provided in the permeate tube and at least one guide key is provided in the permeate outlet and, if present, the intermediate hole, respectively, of the finishing disk. A deflection disk. It is furthermore preferred that at least two grooves are provided in the permeate tube and that two guide keys are provided in the permeate outlet of the finishing disk and, if present, in the central hole of the deflection disk, respectively. Furthermore, the grooves and guide keys in the permeate tube are offset by 180 ° respectively.

According to another embodiment of the invention, the housing is a pressure housing. The housing is preferably cylindrical. Furthermore, the permeate tube is preferably also cylindrical and protrudes through the central hole beyond the finishing disk of the housing.

Surprisingly, it has been shown that the construction of the membrane module according to the invention enables the membrane module to be manufactured or retrofitted without the need for a press.

The membrane module according to the invention can be used for separating mixtures of liquids and/or gases. The membrane module according to the invention has advantages, in particular for reducing emissions on the breathing line of a storage tank, as described in EP 0752974B 1, which is hereby incorporated in its entirety by reference. It is advantageous here that the membrane bag, in particular in aggressive environments where the membrane bag has a short service life, can be replaced in a simple manner without having to transport the system to the manufacturer.

Detailed Description

The invention will now be described in more detail by way of example only with reference to the accompanying drawings, which are not intended to be limiting of the invention. In the drawings:

FIG. 1 is a schematic of a membrane module according to the present invention, showing the housing, finishing disks, deflection disks, permeate tube, and permeate cap, but not the membrane stack.

FIG. 2 is a schematic illustration of a permeate tube with assembled deflection disks that can be used in membrane modules according to the present invention.

FIG.3 is a schematic view of a finishing disk that can be used in the membrane assembly described in the present invention.

FIG. 4 is a schematic view of a deflector disc that can be used in the membrane module of the present invention.

FIG.5 is a schematic view of a permeate cap that can be used in the membrane module of the present invention.

Returning to fig. 1, the membrane module 1 according to the invention has a housing 2 which is used to form a vessel interior space by means of a finishing disk 4 on both ends and is closed in a pressure-tight manner. Holes 41 for the feed inlet or retentate outlet, respectively, are located in the finishing disc 4. Furthermore, a hole for the press-fitting of the permeation tube 3 is located in the finishing disk 4, said hole 41, as shown here by way of example, being centrally arranged in the finishing disk 4. The permeate tube 3 is flanged on both sides to at least one finishing disc 4 by means of a permeate cap 6. At least one end of the permeate tube 3 comprises a permeate outlet 33.

One or more deflection disks 7 (fig. 4) are arranged in the housing, wherein the deflection disks 7 each have a recess for guiding the feed flow in a meandering feed flow from the at least one feed opening 41 to the at least one retentate outlet. The deflection disk 7 likewise has a hole for the push-fitting of the permeate tube 3, said hole being centrally arranged in the deflection disk 7. A plurality of deflection discs 7, for example two, three, four, five, six, seven, eight or more deflection discs 7, which are used to form a plurality of compartment sections of the membrane module, are typically arranged in the housing. Stacks of membrane bags (not shown) separating the feed stream into a retentate stream and a permeate stream are arranged between the finishing discs 4, or between the deflection disc 7 and the finishing disc 4, or between the finishing discs 7, respectively. The stacking of the bags is preferably done in an overlapping manner using an annular seal so that the retentate does not enter the permeate tube. The permeate of the bag dissipates centrally to the interior and is discharged through the permeate tube.

Fig. 1 shows, by way of example, a module with stage divider disks 5, which stage divider disks 5 divide the membrane module into different sections.

Fig. 2 shows schematically a permeate tube 3 according to the invention with assembled stage divider disks 5. The permeate tube 3 is shown with a circular cross-section 32 with two grooves 34, which are offset by 180 °. The permeate tube has a plurality (e.g., two, three, four, five, six, seven, eight, nine, ten, eleven, twelve, thirteen, fourteen, fifteen, sixteen, or even more) permeate inlet apertures 31 for receiving a permeate stream from the membrane bag. The permeate tube 3 may be integral or in multiple parts so that the stage divider disks can be push-fitted thereon and removed therefrom again when required. In fig. 2a two-part permeate tube 3 is shown, wherein the stage separator disc 5 is fitted to the permeate tube 3 by means of an internal thread or welded to the permeate tube 3.A deflection disc 7 (fig. 4) subdivides the latter into compartment areas within the membrane section, which is press-fitted together with the membrane stack to the permeate tube 3.

The stage divider disk 5 preferably has a substantially circular cross section corresponding to the cross section of the housing, wherein the cross section is chamfered on the circular segment so that the feed flow within the housing can pass from one segment to the next. The stage divider disk preferably has a groove on its circumference, in which a seal, such as a rubber seal, can be inserted. The permeate tube 3 preferably has at least one external thread, preferably at least two external threads, for fixing at least one permeate cap 6, preferably two permeate caps 6. Also, the permeate tube 3 is divided into two parts, wherein one part of the permeate tube 3 supports at its end two external threads for, on the one hand, fixing the permeate cap 6 by means of internal threads in the permeate cap 6 and, on the other hand, fixing the separation discs 5 by means of internal threads of the separation discs 5 and fixing the second part of the permeate tube 3 by means of internal threads of the second part of the permeate tube 3. The second part of the permeate tube 3 has an internal thread at one end for fixing the first part of the permeate tube 3 on the external thread of the latter, between which the stage separation discs are located, and an external thread at the other end for fixing the permeate cap 6.

The permeate outlet 33 is centered through the permeate tube, for example by applying negative pressure, for operation. If the membrane module 1 is subdivided into two sections by means of stage separation discs 5, the permeate outlets 33 of the respective sections take place on opposite sides of the permeate tube 3; thus, in the case of this configuration, two permeate outlets 33 are provided.

Fig.3 shows a finishing disk 4 according to the invention, which encloses the housing 2 on both sides (fig. 1). The finishing disk 4 shown has a circular cross section, which corresponds to the cross section of the housing. Preferably, a sealing groove 43 for receiving a seal, such as a rubber seal, is preferably used for the hermetic sealing. The finishing disk 4 has at least one hole 41 allowing the feed stream to enter, or the retentate stream to exit (feed inlet hole/retentate outlet hole 41). The finishing disk 4 also has a hole (fig. 1) for a push-fit of the permeate tube 3, which hole is in this case centrally located. The holes have a circular cross-section, which corresponds to the permeate tube cross-section 32 (fig. 2). Furthermore, the hole has at least one guide key 42 for aligning the permeate tube 3 and the finishing disk 4 in an interfitting manner. The finishing disk 4 shown has a circular cross section provided with two guide keys 42 which are offset by 180 °.

fig. 4 shows a deflection disc 7 according to the invention which can be press-fitted to a permeate tube. The shown deflection disc 4 has a substantially circular cross section, which corresponds to the cross section of the housing, however the cross section is chamfered on a circular section, so that the feed flow in the membrane module can pass from one compartment area to the next. The deflection plates through their chamfered circular sections are preferably mounted offset by 180 ° in the housing, respectively, so that the feed flow in the meandering feed flow enters the at least one retentate outlet from the at least one feed opening 41 (fig. 1). Preferably, a sealing groove 73 is provided for receiving a seal (e.g., a rubber seal) for airtight sealing.

The deflection disc 7 has a hole for a push fit of the permeate tube 3 (fig. 1), which hole is in this case centrally located. The holes have a circular cross-section, which corresponds to the permeate tube cross-section 32 (fig. 2). Furthermore, the holes have at least one guide key 72 for aligning the permeate tube 3 and the deflection disc 7 in an interfitting manner. The deflector disc 7 shown has a circular cross-section provided with two guide keys 72 which are offset by 180.

Fig.5 shows a permeate cap 6 for flange fitting the permeate tube 3 to a finishing disk in a flange region 65. The permeation cap 6 preferably has an internal thread, which corresponds to the external thread of the end of the permeation tube. The osmotic cap 6 preferably has a cylindrical osmotic cap body 64 in which a keyway 67 is provided for securing the osmotic cap 6 to the osmotic tube 3 by a key tool. Alternatively, the osmotic cap may also be configured in an angular fashion, such as a hexagon, so that it can be screwed tightly onto the osmotic tube by means of a key tool.

List of reference numerals:

1 Membrane Module

2 casing

3 penetration pipe

4 finishing plate

5-stage separating disc

6 infiltration cap

7 deflection disk

31 penetration hole

32 penetration tube cross section

33 permeate outlet

34 groove

41 feed/retentate outlet ports

42 guide key

43 seal groove

64 permeating cap body

65 flange part

67 key groove

72 guide key

73 sealing groove