JP2010167420A - Fluid separation element and fluid separation apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent the damage of a fluid separation element when the plurality of fluid separation elements are loaded in series inside a pressure container and operated. <P>SOLUTION: The fluid separation element has a structure wherein a telescope-preventing plate 9 is disposed at the end part of a spiral wound body composed by spirally winding a separation membrane, a raw water passage material and a permeated water passage material. Multiple fluid separation elements are loaded in series inside the pressure container and used. The fluid separation element is characterized in that a recessed part for brine seal mounting is provided on the outer peripheral surface of the outer peripheral ring part of the telescope-preventing plate, a hole 13 is provided on the outer peripheral ring part of the telescope-preventing plate on the downstream side as a path for making the raw water side passage of the fluid separation element communicate with a gap 12 between the fluid separation element and the pressure container, and the telescope-preventing plate on the upstream side is not provided with a hole on the downstream side of the recessed part for brine seal mounting. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

The present invention relates to a fluid separation element and a fluid separation device that are preferably used in reverse osmosis devices, nanofiltration devices, ultrafiltration devices, microfiltration devices, and the like.

  In recent years, separation in various fluid separation fields using membrane permeates or concentrated liquids such as seawater desalination and ultrapure water applications in the semiconductor field, as well as general brine applications, organic matter separation, wastewater reuse, etc. The use of membrane-based fluid separation elements is increasing rapidly.

Examples of the form of the fluid separation element include those using hollow fiber membranes, flat membrane plate frame types, and spiral types. Among these, a spiral type fluid separation element takes a structure wound in a spiral shape around the water collecting pipe separation membrane with the permeate channel material and the raw water flow path member. The spiral type fluid separation element, as shown in FIG. 1, the permeate flow path member between the first isolation layer 3 and the second envelope-shaped film adhesive to form each other three sides of the separation membrane 4 5 pinching, the raw water flow path member 6 as a single unit, and single or multiple units prepared, shall be the spiral Makitai 17 wound spirally around the water collecting pipe 1. The envelope-like membrane is opened on the water collecting pipe 1 side. The raw water 2 is supplied from one end face of the fluid separation element, and is processed by the first separation membrane 3 and the second separation membrane 4. The permeated water 8 that has passed through the separation membranes 3, 4 is taken out from the water collecting pipe 1, and the raw water 2 that has not passed through the separation membranes 3, 4 is discharged as concentrated water 7 from the other end face of the fluid separation element.

In the normal spiral type fluid separation element , the outside of the spiral wound body 17 is hardened with an FRP shell of glass fiber and epoxy resin (outer shell 11) , and a telescope prevention plate 9 is attached to both ends in the longitudinal direction. Take.

On the upstream side of the telescope prevention plate of a fluid separation element has a seal member called a brine seal, the raw water is prevented from short path into the gap between the outer FRP shell and the pressure vessel of the fluid separation element. The brine seal may be an O-ring or the like, but a U seal or the like is often used because of its ability to be loaded into a pressure vessel. When the fluid flows from the upstream side, the U seal opens to seal the telescope prevention plate and the pressure vessel in a fluid-tight manner. The flow from the downstream side cannot be liquid-tightly sealed due to its structure.

When the fluid separation element is used, about 1 to 6 pressure vessels are used in series in a pressure vessel, and a large number of the pressure vessels are installed on a rack to handle a large volume of fluid .

When loaded with a plurality of fluid separation elements in series in a pressure vessel, usually of the two fluid separation elements continuous and downstream of the telescope prevention plate of a fluid separation element on the upstream side, a downstream side fluid separation from the gap between the upstream side of the telescope prevention plate of the device for which fluid can flow into the clearance space between the outer and the pressure vessel of the fluid separation element on the upstream side, FRP outer fluid separation element The same pressure is applied to the inside and outside of the shell .

However, in the context of actual operation, the structure of the apparatus, operating conditions, for some reason usage, etc., if a state in which the end surfaces on each of the telescoping prevention plate of the plurality of fluid separation element was charged to the pressure vessel are in close contact Rarely occurs. Further, in some circumstances brine seal, there is Rukoto such a state as to seal the fluid from the downstream side in a liquid-tight manner.

In such a state, a pressure difference is generated inside and outside the outer FRP shell of the fluid separation element. That is, on the outside of the FRP shell is a pressure during fluid separation element loading (atmospheric pressure), the inside of the FRP shell that Do and pressure of the feed raw water (high pressure). The pressure of the feed raw water, when performing seawater desalination also reach 6～9MPa. Therefore, the outer FRP shell portion of the fluid separation element when the pressure difference condition occurs frequently Succoth Oko rupture can not withstand the pressure differential. When ruptured, there are cases where the encapsulating film is damaged and the performance is significantly reduced.

As a prior art, there is a fluid separation element provided with an opening for communicating the inside and outside of the outer FRP shell of the fluid separation element (see , for example, Patent Documents 1 and 2 ) . Opening of the case is a passage is opened to the shell portion or the like behind the brine seal (nearest downstream), it shall be the purpose of preventing retention of the raw water in the gap between the shell and the pressure vessel. In this case, the raw water, since the passage from the opening and short path easily, can not be passed to enable the film surface portion of the fluid separation element, there is a problem that the performance is deteriorated, foods, etc., particularly hate residence It is limited that apply.

In addition, as a conventional telescope prevention plate , it can be easily sealed at the time of connection (for example, refer to Non-Patent Document 1), or a type that prevents inflow of raw water by opening countless holes in the telescope prevention plate (for example, non-patent) Document 2 reference) have been used, both in the case of unforeseen are at risk of causing rupture occurs the adhesion surface between the telescoping prevention plate.

Japanese Utility Model Publication No. 5-93530 Japanese Patent Laid-Open No. 4-330921

Johnson J Irek interlocking Endcaps Make Seawater Desalination Processing Easy Seawater Desalination Processing Easier Less Expensive [online], Dow Chemical Company, August 2004 31st, Dow Chemical Company website [searched on January 20, 2005], Internet <URL http://www.dow.com/webapps/lit/litorder.asp?filepath=liquidseps/pdfs/noreg/609-00466. pdf> Hydronautics (HYDRANATUICS), FLUSH CUT ELEMENT DESIGN, Technical Service Bulletin, [online] September 2002, Hydronautics homepage [searched January 20, 2005] Internet <URL: http://www.membranes.com/docs/tsb/tsb103.pdf>

An object of this invention is to prevent the trouble that the fluid separation element bursts during operation. Specifically, when connected by loading a fluid separation element in a pressure vessel, even if the surface between the telescope prevention plate has Tsu Do a state of close contact, between the pressure vessel and the fluid separation element the Razz such as to significantly different situations and pressure raw water pressure, and an object thereof is to prevent damage to the fluid separation element.

In order to achieve the above object, the fluid separation element of the present invention has the following configuration. That is,
(1) separation membrane, the raw water flow path member and permeate channel material telescoping preventing plate to the ends of the spiral wound body and the outer shell with the outer shell is provided on the outer periphery of the spiral wound body formed by winding spirally There have a arranged structure, the fluid separation device that is used by multiple loaded in series in a pressure vessel, there is the brine seal attachment recess on the outer peripheral surface of the outer peripheral ring portion of the telescope prevention plate, fluid separation a raw water flow path in the device, as a passage that Ru is communicating the gap between the fluid separation element and the pressure vessel, holes are provided in the outer peripheral ring portion on the downstream side of the telescope prevention plate and the upstream tele A fluid separation element characterized in that no hole is provided in an outer shell on the downstream side of the scope seal plate and on the downstream side of the upstream telescope .
(2) The fluid separation element according to (1) , wherein a brine seal is not attached to the outer peripheral surface of the downstream telescope prevention plate .

(3) The fluid separation element according to the above (1) or (2), wherein the total area of the holes provided in the outer peripheral ring portion of the downstream telescope prevention plate is ² to 100 mm ² .
(4) The fluid separation element according to any one of (1) to (3), wherein the hole in the outer peripheral ring portion of the telescope prevention plate is a round hole.
(5) Longer than the brine seal mounting recess on the outer peripheral ring of the upstream telescope prevention plate as a passage for communicating the raw water flow path in the fluid separation element and the gap between the fluid separation element and the pressure vessel The fluid separation element according to any one of the above (1) to (4), wherein a hole is provided on the direction end side.

(6) A plurality of fluid separation elements according to any one of the above (1) to (5) are loaded in series in a pressure vessel, and are connected in a form in which telescope prevention plates of adjacent fluid separation elements are in contact with each other. And a thrust ring is loaded downstream of the most downstream fluid separation element.
Consists of.

Effect obtained by the fluid separation device of the present invention, even if the surface between the telescope prevention plate becomes close contact, the occurrence of liquid-tight state can proof Gukoto, it can prevent the rupture of the fluid separation element It is.

It is a general | schematic partially expanded view which shows one embodiment of the spiral type fluid separation element to which this invention is applied . It is sectional drawing which shows the outline at the time of loading the fluid separation element using the conventional telescope prevention board in a pressure vessel in series. It is sectional drawing which shows the outline at the time of loading the fluid separation element using the conventional telescope prevention plate in series in a pressure vessel, and loading the thrust ring in the most downstream side . It is sectional drawing which shows the outline at the time of loading the fluid separation element ( what formed the hole 13 in the telescope prevention plate ) of one embodiment of this invention in the pressure vessel. Outline of the case where a fluid separation element with a φ2 mm hole in the outer shell at a position 20 mm from the downstream telescope prevention plate and a brine seal attached to both the upstream and downstream is loaded in the pressure vessel (reference example). It is sectional drawing shown . It is sectional drawing which shows the outline at the time of loading the fluid separation element ( what attached the brine seal to the telescope prevention board of both upstream and downstream sides) used in the comparative example 1 in the pressure vessel .

Hereinafter, embodiments of the present invention will be described with reference to the drawings. Fluid separation element of the present invention is applied, I Oh in scan Pairaru type Fluid separation element has an outer shell, it is loaded in a pressure vessel, raw water to the gap between the pressure vessel and the fluid separation element Ru der those using brine seal-like member for preventing the flow.
In normal operation, as shown in FIG. 2, since no he especially sealing means are e Bei between fluid separation element between loaded in series in a pressure vessel, not a liquid-tight state. At this time, the gap between the outer shell and the pressure vessel of the fluid separation element the same city as Runode raw water pressure, never force the rupture direction to the outer shell is applied.

However, there are cases where the downstream telescope prevention plate of the upstream fluid separation element and the upstream telescope prevention plate of the downstream fluid separation element are in close contact with each other and become liquid-tight due to operating conditions, substances in the raw water, etc. Rarely occurs. In this case, from the downstream side of the fluid separation element on the most downstream side, along the gap between the outer shell and the pressure vessel of the fluid separation element, the outer shell and the pressure of the fluid separation element of the pressure of the raw water is the most upstream side is a gap in Madeka or Tteku Ruhazu between the container.

However , for example, the thrust ring disposed on the most downstream side as shown in FIG. 3 makes the gap between the downstream side of the most downstream fluid separation element and the lid on the downstream side of the pressure vessel for some reason. or when, or if the flow of raw water to the upstream side is Ru prevented from the downstream side I sama between the brine seals fluid separation element and the pressure vessel, the upstream and downstream directions as such as an O-ring as a brine seal In the case where a sealing material that seals liquid-tightly is used regardless of whether or not the raw water pressure propagates from the downstream side to the upstream side, the gap between the pressure vessel and the fluid separation element , and the fluid separation element A pressure difference is generated between the inside and the inside. Here, as the outer shell , FRP (Fiber Reinforced Plastics) is usually used in which glass fibers are hardened with a resin. However, if the inner and outer sides of the fluid separation element can be substantially liquid-tight, tape winding or Film winding or the like may be used .

When the pressure difference inside and outside the outer shell of the fluid separation element occurs, that the pressure difference is the same level and the raw water pressure, in particular it will be subjected to a pressure differential of about 6MPa seawater desalination, in the FRP of the outer shell It becomes a condition that is easily destroyed.
In fluid separation element of the present invention, so as not to cause such a pressure difference, the Te Resukopu preventing plate, Ru provided a hole 13 communicating with the gap between the pressure vessel and the fluid separation element. The form of the hole is illustrated in FIG.

At this time, if only to prevent rupture than the intended, but never to worry about the positional relationship between the brine seals the hole 13, the gap between the original purpose (fluid separation element and the pressure vessel of the probe line seal for raw water performance of the fluid separation element with a short path does not inhibit the purpose) of preventing a decrease within, at the upstream side of the telescope prevention plate of at least the fluid separation element, the communicating passage to the nearest downstream of brine seals Do not open holes .

The number of holes 13 as communicating passages, in 1 to 24 or so, preferably from about 4 to 12. Sectional total area of the holes 13, since the purpose Rukoto to conduct fluid to equalize the pressure, may be a relatively small cross-sectional total area, it is possible to achieve near object if 2 mm ² or more . Further, the cross-sectional total area becomes excessively large size of the too large than necessary telescoping prevention plate, to be forced to decrease in membrane area, the upper limit of the cross-sectional total area of substantially the 100 mm Up to about ² . In practice, good Masui and considering the influence of the function and membrane area of about 2 to 100 mm ^2.

The cross-sectional shape of the hole, round, triangular, square, semicircle or the like can be mentioned, et al is, as long as it can ensure the flow path of the communication passage to the telescoping preventing plate. From the viewpoint of the manufacturing, round cross-section of the holes Ru easily implemented form easy der.

The present invention, when loaded with a plurality of fluid separation elements in series in a pressure vessel, a surface of the telescope prevention plate of two fluid separation elements adjacent substantially in contact with and how the outer peripheral portion, or substantially contact Applied to the type of element in the state. Usually in this type, Ru is connected with the connector entering the connection permeate adjacent elements within the central pipe.

Further, the Te Resukopu preventing plate is produced by injection molding, it is not a multi also upstream using the same is also the downstream side. Therefore, when providing a communication passage in such a telescope prevention plate, it is desirable to install a hole of the communication passage on the end side in the longitudinal direction of the fluid separation element from the brine seal. Providing holes in the communicating communication path.

FIG even lower flow side in the upper stream side in the example of 4, but is using the same telescope prevention plate provided with holes in the communication passage to the outer peripheral ring portion, a communicating passage telescope prevention plate on the downstream side Even when provided, the object of the present invention can be achieved.
Considering from the viewpoint of securing the communication passage may be a method of installing a communication passage hole or the like to the outer shell of the flow body separation device, but in this case, the fluid separation element downstream portion reasons of short pass prevention of raw water It is desirable to install a communication passage.

(Reference example)
Open digits such that four equidistant to each place to φ2mm holes 90 degrees 20mm position from the downstream side telescope prevention plate of the outer shell of the fluid separation element.
Simulatively so that the pressure difference in the fluid separation element and out is applied, both mounted on the downstream side on stream side of the fluid separation element brine seal as shown in Figure 5, it was charged to the pressure vessel.
The raw water supply conditions were set such that the raw water ( brine ) flow rate was 130 L / min, seawater with a total solute concentration of 3.5 wt%, and 9 MPa, and the operation was started.
Removed fluid separation element from the pressure vessel after 60 minutes to confirm the damaged situation. The fluid separation element was not damaged, and the outer shell was also observed. As a result, no evidence of breakage was found.

(Comparative Example 1)
To telescope prevention plate in the outer shell, we were prepared conventional fluid separation element without holes or grooves or the like serving as the communication passage (Toray Industries Co., Ltd. TM820-400).
Simulatively so that the pressure difference in the fluid separation element and out is applied, both mounted on the downstream side of the brine seal on the upstream side of the fluid separation element as shown in FIG. 6, it was loaded into a pressure vessel.
The raw water supply conditions were set to be a brine flow rate of 130 L / min, seawater with a total solute concentration of 3.5 wt%, and 9 MPa, and the operation was started.
Stop operation for pops the after 10 seconds, it was taken out of fluid separation element from the pressure vessel, and rupture the outer shell of the fluid separation element, the film in had jumped torn.

(Comparative Example 2)
To telescope prevention plate in the outer shell, the conventional fluid separation element without holes or grooves or the like serving as a communicating passage (Toray Co., Ltd. TM820-400) were prepared six.
The brine seal was processed so as to be liquid-tight both upstream and downstream, and was mounted on the upstream portion of the fluid separation element. Six fluid separation elements were loaded in a series of six pressure vessels. In this case, the thrust ring is mounted in the upstream and downstream side of the fluid separation element array, a fluid separation element array and 3mm compression by the lid of the pressure vessel, substantially falls within the gap between the inner side and the pressure vessel of the fluid separation element It was designed to be liquid-tight.
The raw water supply conditions were as follows: raw water ( brine ) flow rate 80 L / min, seawater with a total solute concentration of 3.5% by weight, and 5.5 MPa.
Since there was a popping sound 3 times within 5 to 6 minutes after the start, the apparatus was stopped, the fluid separation element was taken out from the pressure vessel , and the state of breakage was confirmed. The outer shells of a total of three fluid separation elements, the first, third, and fourth, from the upstream side burst, and the inner membrane was torn out.

1: Catch pipe 2: Flow direction of supplied raw water (raw water flow path)
3: the first separation layer 4: second separation membrane 5: permeate flow path member 6: raw water flow path member 7: concentrated water 8: permeated water 9: outer circumference of the telescoping preventing plate ring portion 10: brine seal 11 : Outer shell 12: gap between fluid separation element and pressure vessel 13: hole 14 as communication passage: thrust ring
17: Spiral roll

Claims (6)

  It has a structure in which a telescope prevention plate is arranged at the end of a spiral wound body in which a separation membrane, raw water channel material and permeate channel material are wound in a spiral shape, and a plurality of them are loaded in series in a pressure vessel In the fluid separation element used, there is a concave portion for mounting a brine seal on the outer peripheral surface of the outer peripheral ring portion of the telescope prevention plate, and between the raw water flow path in the fluid separation element and the fluid separation element and the pressure vessel As a passage that communicates with the gap, a hole is provided in the outer peripheral ring portion of the downstream telescope prevention plate, and the upstream telescope prevention plate is not provided with a hole downstream from the brine seal mounting recess. A fluid separation element. ^2. The fluid separation element according to claim 1, wherein the total area of the holes provided in the outer peripheral ring portion of the downstream telescope prevention plate is ² to 100 mm < ² >.   The fluid separation element according to claim 1, wherein a brine seal is not attached to the outer peripheral surface of the downstream telescope prevention plate.   Longitudinal end from the brine seal mounting recess of the outer peripheral ring of the telescope prevention plate on the upstream side as a passage for communicating the raw water flow path in the fluid separation element and the gap between the fluid separation element and the pressure vessel The fluid separation element according to claim 1, wherein a hole is provided on the side.   The fluid separation element according to any one of claims 1 to 4, wherein the hole in the outer peripheral ring portion of the telescope prevention plate is a round hole.   A plurality of fluid separation elements according to any one of claims 1 to 5 are loaded in series in a pressure vessel, are connected in a form in which telescope prevention plates of adjacent fluid separation elements are in contact with each other, and A fluid separation device, wherein a thrust ring is loaded downstream of a downstream fluid separation element.

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