JP5233109B2 - Fluid separation membrane module - Google Patents

Description

  The present invention relates to a fluid separation membrane module having a unique structure for protecting a fluid separation membrane in the vicinity of a portion facing an outer peripheral surface opening in a fluid separation membrane module having an opening on an outer peripheral surface.

  In recent years, the spread of separation and purification technology using membrane separation technology has been highly appreciated due to its high-level separation function and energy saving features. Examples of its application fields are production of fresh water by desalination of seawater and brine, surface water and groundwater drinking water, production of pure water and ultrapure water used in the semiconductor industry and pharmaceutical industry, domestic wastewater and industrial wastewater, Sewerage treatment of municipal sewage and water recovery from wastewater, recovery of valuable materials from fermentation liquor and waste liquid, etc., liquid treatment field, oxygen enrichment and nitrogen enrichment from air, helium recovery from natural gas It is widely used in a wide range of fields, such as the gas separation field of carbon dioxide gas in the third recovery of oil.

  A fluid separation membrane is a liquid separation membrane such as a reverse osmosis membrane, nanofiltration membrane, ultrafiltration membrane, microfiltration membrane, or oxygen-enriched membrane, nitrogen separation membrane, carbon dioxide gas separation based on the separation target and separation mechanism. It is classified as a gas separation membrane such as a membrane. On the other hand, when focusing on the form of the fluid separation membrane, it is classified into a hollow fiber membrane, a tubular membrane, a flat membrane, a spiral membrane and the like. The fluid separation membrane module refers to an assembly of these fluid separation membranes in a usable form by connecting pipes.

  Here, the case where the fluid separation membrane module is a water purification membrane module made of an internal pressure type hollow fiber membrane will be described as an example, and the case where purified water is obtained from surface water or groundwater by the water purification membrane module will be described as an example.

  FIG. 1 is a schematic view showing the entire internal pressure type hollow fiber type water purification membrane module of an example of an embodiment according to the prior art when the outer peripheral surface opening 110 is near the center with respect to the axial direction of the case. The membrane module includes a cylindrical case 100 and a pair of caps 200 and 300 that close the end portions in the axial direction. The case 100 and the caps 200 and 300 are fastened by fastening means 700. Inside the case 100, a hollow fiber membrane bundle 400 composed of a plurality of hollow fiber membranes 410 wrapped in a hollow fiber membrane protective cylinder 420 is disposed so as to extend in the axial direction. The outer peripheral surface of the hollow fiber membrane protection cylinder 420 has a net shape or a wall shape with a large number of holes so that water can pass therethrough. The raw water is filtered by the hollow fiber membrane 410 to purify the water. The upper end portion and the lower end portion of each hollow fiber membrane 410 are sealed and fixed to the case body 100 by a sealing resin 500. That is, the sealing resin 500 is filled in the gap between the plurality of hollow fiber membranes 400 and the gap between the hollow fiber membranes 410 and the inner wall surface of the case body 100, thereby fixing the hollow fiber membranes 400 in a liquid-tight manner. In the hollow fiber membrane 410, the upper and lower ends thereof are opened, and only the upper end and the lower end are fixed with the sealing resin 500, and the other intermediate portion fulfills the water purification function. In addition, an outer peripheral surface opening 110 is formed at the center of the case 100. On the other hand, each cap 200, 300 is composed of a cap plate-like cap body 210, 310, and openings 220, 320 are formed respectively.

  Pressurized raw water is supplied to the inside of the hollow fiber membrane through the opening 220, and a part or all of the raw water passes through the hollow fiber membrane and flows out of the outer surface opening 110 to the outside of the water purification membrane module. The remaining water flows out of the water purification membrane module from the opening 320 without being subjected to membrane filtration. Since raw water contains various contaminants, if membrane filtration is continued, contaminants accumulate on the membrane surface and inside the membrane, increasing membrane filtration resistance. In order to reset this, periodic backwashing is performed to remove the accumulation on the film surface and inside the film. At that time, clean water or a cleaning liquid containing a cleaning agent is pressurized and supplied from the outer peripheral surface opening 110 and discharged from one or both of the openings 220 and 320. The backwash flow rate is adjusted as appropriate depending on conditions such as the degree of increase in membrane filtration resistance, the amount and type of contaminants, backwash time, and type of cleaning solution. It is preferable to set it as about 1.5 to 5 times. At this time, since a large amount of cleaning liquid flows from the outer peripheral surface opening 110, a very large force is applied to the hollow fiber membrane 410 in the front portion of the outer peripheral surface opening 110, which may cause damage. In particular, in the water purification membrane module that has been spreading in recent years, the module has been increased in size and the membrane filtration has a higher flux, and accordingly, the amount of backwash water has also increased. For this reason, the force which acts on the hollow fiber membrane of an outer peripheral surface opening part opposing part by a backwashing liquid also becomes large, and the concern that a hollow fiber membrane will be damaged becomes larger than before. Furthermore, in order to manage the operation of the water purification membrane module, there is a need for an improved verification method for checking whether the hollow fiber membrane is damaged at the outer peripheral surface opening facing portion and whether the contamination has progressed.

In Patent Document 1, an annular body having a protrusion for preventing direct movement of water flow is fitted to the end of the case, and the flow of permeated water and cleaning liquid is bypassed to prevent the water flow from directly colliding with the hollow fiber membrane. A technique for avoiding damage to the hollow fiber membrane is disclosed. In this prior art, the protrusion for preventing the direct movement of the water flow has a form extending from the annular body arranged at the end of the case, and therefore can be applied only when the fluid inlet / outlet is near the end. There is a problem that it cannot be applied when there is a fluid inlet / outlet near the center.
JP-A-62-144709

In Patent Document 2, a cylinder is installed so as to cover the hollow fiber membrane yarn bundle at the end of the case, and the hydraulic pressure is effectively transmitted to the central portion of the hollow fiber membrane yarn bundle by giving the cylinder a rectifying action. At the same time, a technique for preventing damage to the hollow fiber membrane is disclosed. This technique also has a problem that it cannot be applied when the fluid inlet / outlet is not near the end.
Japanese Patent Laid-Open No. 3-16622

Among the techniques for damaging the hollow fiber membrane at the fluid inlet / outlet facing portion, the techniques applicable even when the fluid inlet / outlet is formed near the center of the outer peripheral portion of the fluid separation membrane module case are disclosed in Patent Document 3 and Patent Document 4. It is disclosed. Patent Document 3 discloses a technique in which a heat-shrinkable sheath is disposed at a position facing the orifice of the sleeve, and the sheath is contracted and fixed to provide a shield against the flow of fluid, thereby preventing damage to the hollow fiber membrane. It is disclosed. Further, Patent Document 4 discloses that a hollow fiber membrane protection plate is disposed at a fluid inlet / outlet facing portion inside the hollow fiber membrane bundle protection net to prevent damage to the hollow fiber membrane due to severe vibration generated when the fluid enters and exits. It is stated that it can be done.
JP-A-2-187132 JP-A-8-206468

  In the large water purification membrane module, the backwash flow rate becomes large, and the drag acting on the hollow fiber membrane due to the flow of the backwash liquid becomes very large. When the rigidity of the sleeve in Patent Document 3 or the hollow fiber membrane protective plate in Patent Document 4 is not sufficient, they may be deformed by the flow of backwashing liquid and damage the hollow fiber membrane. Moreover, when the rigidity of the sleeve in Patent Document 3 or the hollow fiber membrane protection plate in Patent Document 4 is high, both of them are sealed and fixed together with the hollow fiber membrane at the resin adhesion portion at the end of the fluid separation membrane module. Although the sleeve or the hollow fiber membrane protection plate is supported by the bonded portion, the resin bonded portion may be deformed or broken, and there is a risk of causing a leak. In addition, when the fluid inlet / outlet is near the center of the fluid separation membrane module, the force acting on the resin bonding portion is amplified by the lever principle, and is several to several tens of times that when the fluid inlet / outlet is near the end. There is a case where the force acts, and the risk of causing a leak due to deformation or breakage of the resin bonded portion is further increased.

The water purification module according to the present invention is made in order to solve the above-described problems, and has the following configuration. That is,
(1) A substantially cylindrical case, and a fluid separation membrane installed in the case,
The substantially cylindrical case is a fluid separation membrane module having at least one outer peripheral surface opening,
A dispersion plate is installed in at least one of the outer peripheral surface openings,
The dispersion plate includes a dispersion plate shielding portion mainly made of a metal material, a dispersion plate support portion, and a dispersion plate fixing portion.
The dispersion plate shielding portion is inserted into the case from the outer peripheral surface opening so as to be positioned in the gap between the fluid separation membrane and the case inner surface ,
The dispersion plate fixing part is fixed to the outer peripheral surface opening so as to be detachable ,
The dispersion plate fixing part and the dispersion plate shielding part are connected via the dispersion plate support part,
The projected shape of the dispersion plate shielding portion on the surface perpendicular to the fluid traveling direction is substantially the same as the inner surface projected shape of the outer peripheral surface opening, and the projected area is 70% to 99%. A fluid separation membrane module.
(2) The fluid separation according to (1), wherein a shape of a cut surface of the dispersion plate shielding portion by a plane perpendicular to the long axis of the cylindrical case is an arc shape or an elliptical arc shape. Membrane module.
(3) The fluid separation membrane module according to (1) or (2), wherein the dispersion plate includes a dispersion plate nozzle portion connectable to an external pipe.

  According to the fluid separation membrane module of the present invention, since the dispersion plate is installed in the outer peripheral surface opening that is the fluid inlet / outlet, the fluid flowing in from the fluid inlet / outlet can be prevented from directly hitting the fluid separation membrane. It is possible to effectively prevent damage to the fluid separation membrane at the inlet / outlet facing portion. In addition, when replacing the fluid separation membrane module, the dispersion plate can be removed and reused, which saves resources. Further, since the state of the fluid separation membrane in the vicinity of the fluid inlet / outlet can be directly visually observed by removing the dispersion plate, information on the damage state and the contamination state of the fluid separation membrane can be obtained non-destructively. Furthermore, for those having a nozzle portion that can be connected to external piping, the number of parts and work man-hours are reduced, so that efficient construction is possible when installing, replacing, and removing the separation membrane module.

  The case in the present invention is a substantially cylindrical container filled with a fluid separation membrane, and has at least one outer peripheral surface opening on the outer peripheral surface thereof. The left outer peripheral surface opening functions as a fluid inlet / outlet. In the use state of the fluid separation membrane, both ends of the case are coupled to the cap, or a bottom part integral with the case is formed. An opening may be formed in the bottom integral with the left cap or case. The material of the case and cap is not particularly limited, but engineering plastics such as vinyl chloride resin and polysulfone resin, various reinforced resins such as glass fiber reinforced resin, and corrosion-resistant metal materials such as stainless steel are suitable examples. The glass fiber reinforced resin is particularly lightweight as a case material because it is lightweight and excellent in corrosion resistance and has good adhesion to the fluid separation membrane sealing resin. Stainless steel is particularly preferable as a cap material because it is excellent in strength and corrosion resistance and is suitable for connection to external piping. The case and cap may be uneven or colored according to functional or design requirements.

  Moreover, it is preferable that the cap in this invention is equipped with an end plate as a component. There are various types of end plates, such as a dish shape, a regular semi-ellipsoidal shape, an approximate semi-elliptical shape, a hemispherical shape, and a flat mirror shape, and any shape may be used. By providing the end plate as a constituent element, the thickness can be reduced compared with a simple bottomed cylindrical type, and the weight can be reduced and the cost can be reduced.

  The dispersion plate according to the present invention is disposed in the outer peripheral surface opening and has a function of changing and dispersing the flow direction of the fluid flowing in from the outer peripheral surface opening. Accordingly, it is possible to prevent the fluid flow from directly hitting the fluid separation membrane and to prevent damage to the fluid separation membrane.

  The dispersion plate in the present invention includes a dispersion plate shielding portion, a dispersion plate support portion, and a dispersion plate fixing portion mainly made of a metal material. The dispersion plate can be strong enough to withstand the drag force against the fluid flowing in from the outer peripheral opening, has excellent corrosion resistance to the fluid, and is stable under the temperature and pressure conditions in which the fluid separation membrane is used. Required. Stainless steel can be cited as a suitable material that satisfies such requirements. Moreover, in order to improve corrosion resistance etc., passivation, painting, coating or other surface treatments may be applied.

  Furthermore, the dispersion plate in the present invention is fixed so as to be detachable from the outside of the outer peripheral surface opening. As an example of a suitable support method, a flange formed at the outer peripheral surface opening and the dispersion plate fixing portion may be fastened with a bolt. In this case, the connection between the outer peripheral surface opening and the external pipe is performed by fastening the outer peripheral surface opening flange and the outer pipe end flange with a bolt in such a manner that the outer pipe end is a flange type and the dispersion plate fixing part is sandwiched between them. Can be achieved. In order to maintain liquid tightness, it is preferable to insert a gasket between the outer peripheral surface opening flange and the dispersion plate fixing portion, and between the dispersion plate fixing portion and the external pipe end flange. Other suitable fixing methods include fastening with a pipe fastener such as a sanitary rule, V-band coupling, Victorian Joint (registered trademark), Straub coupling (registered trademark), etc. In the case of fixing with, the end portions of the outer peripheral opening and the dispersion plate fixing portion have end shapes suitable for them. On the other hand, in the embodiment in which the dispersion plate includes the dispersion plate nozzle portion, the connection between the dispersion plate nozzle portion and the external piping is flange connection, sanitary herule, V band coupling, Victorian joint (registered trademark), Straub cup. Fastening with a pipe fastener such as a ring (registered trademark) is preferable. In this case, the dispersion plate nozzle part and the end part of the external pipe are formed in an end part shape suitable for it.

  Hereinafter, as an embodiment of the fluid separation membrane module according to the present invention, a hollow fiber type internal pressure type water purification membrane module will be described as an example with reference to the drawings.

  Fig.2 (a) is a schematic diagram which shows the whole of the internal pressure type hollow fiber type water purification membrane module of an example of the embodiment of the present invention when the outer peripheral surface opening 110 is near the center with respect to the axial direction of the case. is there. The membrane module includes a cylindrical case 100 and a pair of caps 200 and 300 that close the end portions in the axial direction. Inside the case 100, a hollow fiber membrane bundle 400 composed of a plurality of hollow fiber membranes 410 wrapped in a hollow fiber membrane protective cylinder 420 is disposed so as to extend in the axial direction. The outer peripheral surface of the hollow fiber membrane protection cylinder 420 has a net shape or a wall shape with a large number of holes so that water can pass therethrough. The raw water is filtered by the hollow fiber membrane 410 to purify the water. The upper end portion and the lower end portion of each hollow fiber membrane 410 are sealed and fixed to the case body 100 by a sealing resin 500. That is, the sealing resin 500 is filled in the gap between the plurality of hollow fiber membranes 400 and the gap between the hollow fiber membranes 410 and the inner wall surface of the case body 100, thereby fixing the hollow fiber membranes 400 in a liquid-tight manner. In the hollow fiber membrane 410, the upper and lower ends thereof are opened, and only the upper end and the lower end are fixed with the sealing resin 500, and the other intermediate portion fulfills the water purification function.

  An outer peripheral surface opening 110 is formed on the outer peripheral surface of the central portion of the case 100, and the dispersion plate 600 is inserted from the outer peripheral surface opening 110. The dispersion plate 600 includes a dispersion plate shielding unit 610, a dispersion plate support unit 620, and a dispersion plate fixing unit 630. The dispersion plate fixing portion 630 is fixed to the outside of the outer peripheral surface opening 110 so as to be detachable by a known means such as a bolt. The dispersion plate support unit 620 is connected to the dispersion plate fixing unit 630 and supports the dispersion plate shielding unit 610. On the other hand, each cap 200, 300 is composed of a cap plate-like cap body 210, 310, and openings 220, 320 are formed respectively.

  The projected shape of the dispersion plate shielding portion 610 onto the surface perpendicular to the fluid traveling direction is substantially the same as the projected shape of the inner surface of the outer peripheral surface opening 110, and the projected area is preferably 70% or more and 99% or less. When the projected area is too small, the backwashing liquid is not sufficiently shielded, and the effect of preventing damage to the hollow fiber membrane at the outer peripheral opening facing portion is reduced. If the projected area is too large, it will not be possible to attach / detach from the outer periphery opening.

  It is preferable that the dispersion plate shielding part 610 has a shape along the outer periphery of the fluid separation membrane and the inner periphery of the case, and is close to the hollow fiber membrane bundle 400. FIG.2 (b) is a schematic diagram which shows the AA cross section of Fig.2 (a). The cross section of the dispersion plate shielding part 610 has an arc shape along the hollow fiber membrane bundle 400. In order to make the water purification membrane module compact, it is preferable that the gap between the inner surface of the case and the hollow fiber membrane bundle 400 be as small as possible. Since resistance increases and backwashing efficiency decreases, it is important to balance both. Considering the influence of the shape of the cross section of the dispersion plate shielding portion on the flow path resistance with a constant gap between the inner surface of the case and the hollow fiber membrane bundle 400, the dispersion plate shielding portion is formed by making the dispersion plate cross section into an arc shape or an elliptical arc shape. Compared to a flat plate, the gap between the dispersion plate shielding part and the inner wall of the case can be increased, and the cross-sectional area of the flow path is increased, so that flow path resistance is reduced and backwashing can be performed efficiently. .

  The flow of water when membrane filtration is performed by crossflow and when backwashing is described with reference to FIG. As shown in FIG. 3 (a), the pressurized raw water is supplied to the inside of the hollow fiber membrane through the opening 220, and a part or all of the raw water passes through the hollow fiber membrane and passes from the outer peripheral surface opening 110. It flows out of the membrane module and becomes production water, and the rest flows out of the membrane module through the opening 320 without being filtered. Since raw water contains various contaminants, membrane filtration resistance increases when membrane filtration is continued, but in order to reset this, it is common to regularly backwash at intervals of several tens of minutes to several hours Is. At that time, as shown in FIG. 2B, clean water or clean water containing an appropriate cleaning agent is pressurized and supplied from the outer peripheral surface opening 110 and discharged from one or both of the openings 220 and 320. To do. The backwash flow rate is appropriately adjusted according to conditions such as the degree of increase in membrane filtration resistance, the amount and type of contaminants, backwash time, and type of cleaning liquid. Generally, it is about 5 to 5 times. In this case, since the cleaning liquid flows in from the outer peripheral surface opening 110 at a large flow rate, a large force is applied to the hollow fiber membrane 410 in the front portion of the outer peripheral surface opening 110, which may cause damage to the hollow fiber membrane. In the present invention, by disposing the dispersion plate 600 in the outer peripheral surface opening 110, the flow of the cleaning liquid is dispersed around by the dispersion plate shielding portion disposed in the front part of the cleaning liquid inflow, and the cleaning liquid flow is generated in the hollow fiber membrane 410. It is possible to prevent direct hitting and thus damage to the hollow fiber membrane.

  Further, as another effect of the present invention, the dispersion plate fixing method is configured to be detachably supported from the outside of the outer peripheral surface opening 110, so that the dispersion plate can be recycled. There is a feature that the hollow fiber membrane in front of the outer peripheral surface opening can be directly visually observed. Recycling of the water purification membrane module contributes to resource and energy saving even if it is a component unit, and is meaningful. In addition, by directly observing the state of the water purification membrane in front of the outer peripheral surface opening, it is possible to obtain information on the damage status and contamination status of the water purification membrane by nondestructive inspection, which is an important advantage in the operation management of the water purification membrane. .

  The schematic diagram of the example of the embodiment at the time of providing the dispersion plate nozzle part 640 connectable with external piping as the dispersion plate 600 was shown in FIG. Moreover, the perspective schematic diagram from the diagonally upper direction of the dispersion plate of the left embodiment is shown in FIG. In this embodiment, since external piping can be directly connected to the dispersion plate nozzle portion 640, the number of parts and the number of work steps can be reduced when installing, replacing, and removing the water purification membrane module as compared with the embodiment of FIG. This is preferable because it enables efficient construction. In FIG. 4, a simple straight pipe type is illustrated as the shape of the dispersion plate nozzle part. However, depending on the connection method with the external pipe as the connection partner, a groove or shoulder for fastening the Victric Joint (registered trademark), It is also a preferred embodiment of the present invention to adopt a terminal shape suitable for known pipe connection, such as providing a protrusion or forming a flange at the end.

  2 and 4 show examples in which the upper and lower caps 200 and 300 are provided with the openings 220 and 320, respectively, the openings can be provided only in one of the caps. . This is the case, for example, when water with relatively little dirt is targeted and when all the introduced water is to be purified. At this time, it is possible not to form a hole in one of the caps, or it is possible to provide a cap and close one end of the case 100 in advance. Further, in the above embodiment, the hollow fiber membrane bundle 400 is sealed and fixed to the case 100. However, the hollow fiber membrane bundle end portion of the hollow fiber membrane bundle is sealed in a liquid-tight manner, and is removable. It is also possible to couple with the case or cap in a liquid-tight manner. Furthermore, although the case where the outer peripheral surface opening is near the center with respect to the axial direction of the case has been described in the above embodiment, the present invention can be similarly applied to the case where the outer peripheral surface opening is near the case end.

  Although one embodiment of the present invention and some of its variations have been described above, the present invention is not limited to these, and various modifications can be made without departing from the spirit of the present invention.

  In addition, the fluid separation membrane module is a water purification membrane module made of an internal pressure type hollow fiber membrane, and the above explanation has been given by taking the case of operating by a cross flow filtration method as an example. The present invention can be similarly applied to a water purification membrane module made of a yarn membrane. Further, the present invention can be similarly applied to those having different forms of fluid separation membranes such as tubular membranes and spiral membranes, and those having different uses of fluid separation membranes such as wastewater treatment and pretreatment of seawater desalination reverse osmosis membranes.

The fluid separation membrane module according to the present invention can effectively prevent damage to the fluid separation membrane in the vicinity of the fluid inlet / outlet. Furthermore, when replacing the fluid separation membrane module, the dispersion plate can be removed and reused. Can be used. Further, by removing the dispersion plate, the state of the fluid separation membrane in the vicinity of the fluid inlet / outlet can be directly visually observed, and information on the damaged state and the contamination state of the fluid separation membrane can be obtained. In addition, since the number of parts and the number of work steps are reduced for those having a nozzle portion that can be connected to an external pipe, efficient construction is possible when installing and removing the separation membrane module. These effects are beneficial for users of fluid separation membrane devices.

It is a schematic diagram which shows the whole internal pressure type | formula hollow fiber type water purification membrane module of an example of the embodiment by a prior art when an outer peripheral surface opening part exists in the center vicinity with respect to the axial direction of a case. It is a schematic diagram of the internal pressure type | formula hollow fiber type water purification membrane module of an example of the embodiment of this invention when an outer peripheral surface opening part exists in center vicinity with respect to the axial direction of a case. FIG. 2A is a schematic view of the whole, and FIG. 2B is a schematic view of the AA cross section of FIG. It is a schematic diagram which shows the flow of the water of the internal-pressure type | formula hollow fiber type water purification membrane module of an example of the embodiment of this invention in case an outer peripheral surface opening part exists in center vicinity with respect to the axial direction of a case. It is a schematic diagram of the internal pressure type | formula hollow fiber type water purification membrane module of an example of the other embodiment of this invention when an outer peripheral surface opening part exists in center vicinity with respect to the axial direction of a case. FIG. 4A is a schematic diagram of the whole, and FIG. 4B is a schematic diagram of an AA cross section of FIG. It is a perspective schematic diagram from diagonally upward of an example of the embodiment of a dispersion plate provided with the dispersion plate nozzle part connectable with external piping.

Explanation of symbols

100: Case 110: Outer peripheral surface opening 200: Lower cap 210: Lower cap body 220: Lower cap opening 300: Upper cap 310: Upper cap body 320: Upper cap opening 400: Hollow fiber membrane bundle 410: Hollow fiber Membrane 420: Hollow fiber membrane protective cylinder 500: Sealing resin 600: Dispersion plate
610: Dispersion plate shielding portion 620: Dispersion plate fixing portion 630: Dispersion plate support portion 640: Dispersion plate nozzle portion 700: Fastening means

Claims (3)

A substantially cylindrical case, and a fluid separation membrane installed in the case,
The substantially cylindrical case is a fluid separation membrane module having at least one outer peripheral surface opening,
A dispersion plate is installed in at least one of the outer peripheral surface openings,
The dispersion plate includes a dispersion plate shielding portion mainly made of a metal material, a dispersion plate support portion, and a dispersion plate fixing portion.
The dispersion plate shielding portion is inserted into the case from the outer peripheral surface opening so as to be positioned in the gap between the fluid separation membrane and the case inner surface ,
The dispersion plate fixing part is fixed to the outer peripheral surface opening so as to be detachable ,
The dispersion plate fixing part and the dispersion plate shielding part are connected via the dispersion plate support part,
The projected shape of the dispersion plate shielding portion on the surface perpendicular to the fluid traveling direction is substantially the same as the inner surface projected shape of the outer peripheral surface opening, and the projected area is 70% to 99%. A fluid separation membrane module.   2. The fluid separation membrane module according to claim 1, wherein a shape of a cut surface of the dispersion plate shielding portion by a plane perpendicular to the long axis of the cylindrical case is an arc shape or an elliptic arc shape. The fluid separation membrane module according to claim 1, wherein the dispersion plate includes a dispersion plate nozzle portion connectable to an external pipe.

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