JPH0593532U - Spiral type membrane module - Google Patents

Abstract

(57) [Summary] [Purpose] Sufficiently maintain the membrane packing density of the membrane element,
Provided is a spiral wound type membrane module capable of sufficiently reducing the flow path resistance on the supply side. [Structure] An opening of an envelope-shaped membrane having a permeation fluid channel inside is connected to a permeation fluid collecting pipe, and a membrane element formed by winding the envelope membrane together with a supply-side channel material around the collecting pipe is a pressure-proof casing. -In the membrane separation module which is housed in the membrane and flows the fluid to be treated in the longitudinal direction to the supply side channel of the membrane element, the supply side channel material has longitudinal ridges on both sides. A plastic film was used.

Description

[Detailed description of the device]

[0001]

[Industrial application]

 The present invention relates to a spiral wound membrane module, which is useful, for example, for gas concentration and separation.

[0002]

[Prior Art]

 Conventionally, there are various types of membrane modules used for gas concentration / separation, but the spiral type membrane module has a relatively simple structure and a relatively high membrane packing density. There are advantages such as high density.

FIG. 3 (a) shows a membrane element used in a spiral wound type membrane module, in which an opening of an envelope-shaped membrane a ′ provided with a permeation gas flow channel material 22 ′ therein is permeated with gas. The enveloped membrane a ′ is connected to the pipe 23 ′ and is wrapped around the gas collecting pipe 23 ′ together with the supply-side channel material 3 ′.

FIG. 3B shows an example of a spiral wound type membrane module in which the membrane element 2 ′ is housed in a pressure resistant case 1 ′ and a membrane element 2 ′ and a pressure resistant case 1 ′ are combined. A packing 4'is installed between them, one end of the gas collecting pipe of the membrane element 2'is closed by a cap 5 ', and an end plate 6'having a gas inlet 61' to be treated is attached to one end of the case. An end plate 7'having a non-permeable gas outlet 71 'is attached to the other end of the case, and the other end of the gas collecting pipe of the membrane element 2'is drawn out from the end plate 7'by a permeated gas outlet pipe 8'. There is.

In order to perform the gas concentration / separation treatment by the spiral membrane module shown in FIG. 3B, the gas to be treated from the gas to be treated supply inlet 61 ′ is wound around the membrane element 2 ′. While flowing in the longitudinal direction from the one end face of the body into the supply-side channel in the film winding body, while the inflowing gas contacts the film surface in the supply-side channel in the film winding body, The specific gas component in the gas is selectively permeated through the membrane, and the non-permeated gas after the permeation / separation of the specific component is discharged from the outlet 71 'at the other end of the case.

On the other hand, a specific gas component that has permeated the membrane of each membrane element, that is, a filtered gas, reaches the gas collecting pipe 23 ′ through the permeating gas flow passage in the envelope-shaped membrane, and reaches the outside from the permeating gas outlet pipe 8 ′. It is taken out.

In the above description, the permeated gas flow rate can be increased as the flow rate of the gas to be processed flowing through the supply-side flow passage in the membrane winding body of the membrane element is increased. Then, as shown in FIG. 3 (a), the corrugated plastic sheet is used for the above-mentioned supply side flow path member 3 ', and the supply side flow path cutoff in the membrane winding body of the membrane element is performed. It has been proposed to increase the area and reduce the resistance of the flow path on the supply side.

[0008]

[Problems to be solved by the device]

 However, in the corrugated plastic sheet, the thickness of the sheet itself needs to be considerably increased in order to retain the corrugation. Therefore, the thickness of the channel material on the feed side becomes considerably larger than the thickness of the membrane itself, and one channel material on the feed side is used for two sheets of the membrane itself. In this way, when the thickness of the feed-side channel material itself becomes significantly larger than that of the membrane itself, the packing density of the membrane decreases under the same outer diameter of the membrane element, and the cross-sectional area of the feed-side channel increases. Even if the permeated gas flow rate is increased by the above, the permeated gas flow rate is rather decreased due to the reduction of the membrane area.

An object of the present invention is to provide a spiral wound type membrane module which can sufficiently maintain the membrane packing density of the membrane element and can sufficiently lower the flow path resistance on the supply side.

[0010]

[Means for Solving the Problems]

 In the spiral wound membrane module of the present invention, the opening of the envelope-shaped membrane having the permeation fluid channel inside communicates with the permeation-fluid collecting pipe, and the envelope-like membrane is provided around the collecting pipe together with the feed-side channel material. In a membrane separation module in which a wound membrane element is housed in a pressure-resistant case, and a fluid to be treated is made to flow in a longitudinal direction to a supply side flow passage of the membrane element, in the supply side flow passage material, The configuration is characterized in that a plastic film having longitudinal ridges on both sides is used.

[0011]

[Action]

 By increasing the height of the ridges of the supply side flow path member, the thickness of the supply side flow path gap in the membrane element can be increased, and the resistance of the supply side flow path can be reduced. In addition, the thickness of the plastic film can be significantly reduced within the range that does not hinder the mechanical strength of being wound into the membrane element, and the membrane can be filled with the thinned thickness, so that the packing density of the membrane is improved. Can hold

[0012]

【Example】

 An embodiment of the present invention will be described below with reference to the drawings. 1 (a) is a cross-sectional explanatory view showing an embodiment of the present invention, in which a pressure-resistant case 1 accommodates a spiral wound type membrane element 2 and the membrane element is as shown in FIG. 1 (b). , The three sides of the two membranes 21 and 21 are sealed to form an envelope, the permeated gas flow path member 22 is housed between the membranes, and the opening of the enveloped membrane a is communicated with the permeated gas collecting pipe 23. A plastic film 3 having longitudinal projections 31 on both sides is used as a channel material on the supply side, which is wound around a permeated gas collecting pipe 23 together with an envelope-shaped membrane a. 4 is a packing mounted between the membrane element 2 and the case 1, and 5 is a cap attached to one end of the permeated gas collecting pipe 23.

As the plastic film 3 of the flow path member on the supply side, as shown in FIG. 2, it is also possible to use a plastic film in which projections 31 are alternately provided on both surfaces. In the above-mentioned embodiment, a two-leaf type membrane element is used, but a single-leaf type or a multi-leaf type membrane using a plurality of envelope-shaped membranes of three or more leaves for one permeating gas collecting pipe. Elements can also be used. The spiral membrane separation module of the present invention can be used not only for gas separation but also for liquid separation.

[0014]

[Effect of the device]

 The spiral wound type membrane module of the present invention has the structure as described above, and uses a plastic film having ridges on both sides for the flow path material of the membrane element to increase the height of the ridges. By doing so, the gap between the winding layer supply side flow passages of the envelope-shaped film winding body can be increased, and the resistance of the supply side flow passage can be reduced.

Further, the film thickness of the plastic film can be made thin within a limit that does not hinder the winding of the film into the membrane element due to its mechanical strength. Since the filling amount of the membrane can be increased, the filling rate of the membrane can be increased. Therefore, it is possible to provide a spiral wound type membrane module having a large permeated gas flow rate by reducing the pressure loss on the supply side and increasing the membrane area.

[Brief description of drawings]

1A is an explanatory view showing an embodiment of the present invention, FIG.
FIG. 1B is a perspective explanatory view showing the membrane element in the same embodiment.

FIG. 2 is an end view showing another example of the supply-side channel material used in the present invention.

FIG. 3 (a) is an explanatory view showing a conventional spiral wound type membrane element, and FIG. 3 (b) is an explanatory view showing a conventional spiral wound type membrane module.

[Explanation of symbols]

 1 case 2 Membrane element a Envelope-shaped membrane 23 Permeate fluid collecting pipe 3 Plastic film 31 Ridge

Claims (1)

[Scope of utility model registration request] 1. A membrane element formed by connecting an opening of an envelope-shaped membrane having a permeate fluid channel inside to a permeate-fluid collecting tube, and winding the envelope-shaped membrane together with a feed-side channel material around the collecting tube. In a membrane separation module which is housed in a pressure-proof case and causes a fluid to be treated to flow in a longitudinal direction in a supply-side channel of a membrane element, in the above-mentioned supply-side channel material, longitudinal ridges are provided on both sides. A spiral wound type membrane module characterized by using a plastic film having