WO2018181411A1 - 流体分離素子およびテレスコープ防止板 - Google Patents
流体分離素子およびテレスコープ防止板 Download PDFInfo
- Publication number
- WO2018181411A1 WO2018181411A1 PCT/JP2018/012614 JP2018012614W WO2018181411A1 WO 2018181411 A1 WO2018181411 A1 WO 2018181411A1 JP 2018012614 W JP2018012614 W JP 2018012614W WO 2018181411 A1 WO2018181411 A1 WO 2018181411A1
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- WIPO (PCT)
- Prior art keywords
- annular portion
- prevention plate
- telescope prevention
- annular
- wound body
- Prior art date
Links
- 230000002265 prevention Effects 0.000 title claims abstract description 88
- 239000012530 fluid Substances 0.000 title claims abstract description 65
- 239000012528 membrane Substances 0.000 claims abstract description 51
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 43
- 239000000463 material Substances 0.000 claims abstract description 18
- 238000000926 separation method Methods 0.000 claims description 96
- 239000012267 brine Substances 0.000 claims description 14
- HPALAKNZSZLMCH-UHFFFAOYSA-M sodium;chloride;hydrate Chemical compound O.[Na+].[Cl-] HPALAKNZSZLMCH-UHFFFAOYSA-M 0.000 claims description 14
- 238000007373 indentation Methods 0.000 claims description 10
- 238000004804 winding Methods 0.000 abstract description 9
- 229920002430 Fibre-reinforced plastic Polymers 0.000 description 12
- 239000011151 fibre-reinforced plastic Substances 0.000 description 12
- 230000002093 peripheral effect Effects 0.000 description 8
- 239000012466 permeate Substances 0.000 description 7
- 230000000694 effects Effects 0.000 description 6
- 239000000853 adhesive Substances 0.000 description 5
- 239000003822 epoxy resin Substances 0.000 description 5
- 229920000647 polyepoxide Polymers 0.000 description 5
- 230000001070 adhesive effect Effects 0.000 description 4
- RBTARNINKXHZNM-UHFFFAOYSA-K iron trichloride Chemical compound Cl[Fe](Cl)Cl RBTARNINKXHZNM-UHFFFAOYSA-K 0.000 description 4
- 239000011342 resin composition Substances 0.000 description 3
- 238000011144 upstream manufacturing Methods 0.000 description 3
- 229910021578 Iron(III) chloride Inorganic materials 0.000 description 2
- 241000209140 Triticum Species 0.000 description 2
- 235000021307 Triticum Nutrition 0.000 description 2
- 239000008394 flocculating agent Substances 0.000 description 2
- 235000013312 flour Nutrition 0.000 description 2
- 239000003365 glass fiber Substances 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 229920002401 polyacrylamide Polymers 0.000 description 2
- -1 polyethylene Polymers 0.000 description 2
- 239000000725 suspension Substances 0.000 description 2
- 239000004698 Polyethylene Substances 0.000 description 1
- 239000004743 Polypropylene Substances 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 230000000295 complement effect Effects 0.000 description 1
- 239000012141 concentrate Substances 0.000 description 1
- 238000010612 desalination reaction Methods 0.000 description 1
- 230000001747 exhibiting effect Effects 0.000 description 1
- 239000012510 hollow fiber Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000001471 micro-filtration Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000001728 nano-filtration Methods 0.000 description 1
- 239000005416 organic matter Substances 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 239000002985 plastic film Substances 0.000 description 1
- 229920006255 plastic film Polymers 0.000 description 1
- 229920000573 polyethylene Polymers 0.000 description 1
- 229920001155 polypropylene Polymers 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 238000001223 reverse osmosis Methods 0.000 description 1
- 239000013535 sea water Substances 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
- 229920002803 thermoplastic polyurethane Polymers 0.000 description 1
- 229910021642 ultra pure water Inorganic materials 0.000 description 1
- 238000000108 ultra-filtration Methods 0.000 description 1
- 239000012498 ultrapure water Substances 0.000 description 1
- 239000002351 wastewater Substances 0.000 description 1
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D63/00—Apparatus in general for separation processes using semi-permeable membranes
- B01D63/10—Spiral-wound membrane modules
- B01D63/106—Anti-Telescopic-Devices [ATD]
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D63/00—Apparatus in general for separation processes using semi-permeable membranes
- B01D63/10—Spiral-wound membrane modules
- B01D63/103—Details relating to membrane envelopes
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D65/00—Accessories or auxiliary operations, in general, for separation processes or apparatus using semi-permeable membranes
- B01D65/003—Membrane bonding or sealing
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/44—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2313/00—Details relating to membrane modules or apparatus
- B01D2313/04—Specific sealing means
- B01D2313/041—Gaskets or O-rings
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2313/00—Details relating to membrane modules or apparatus
- B01D2313/08—Flow guidance means within the module or the apparatus
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2315/00—Details relating to the membrane module operation
- B01D2315/02—Rotation or turning
Definitions
- the present invention relates to a fluid separation element suitably used for a reverse osmosis device, a nanofiltration device, an ultrafiltration device, a microfiltration device, and the like.
- the spiral type fluid separation element has a structure in which a separation membrane is spirally wound around a water collecting pipe together with a permeate flow channel material and a raw water flow channel material.
- the raw water is supplied from one end face of the fluid separation element and treated with a separation membrane.
- the permeated water that has passed through the separation membrane is taken out from the water collecting pipe, and the raw water that has not passed through the separation membrane is discharged as a concentrate from the other end face of the fluid separation element.
- the spiral type fluid separation element has its outer periphery hardened by an outer shell made of fiber reinforced plastic (FRP) made of glass fiber and epoxy resin, and telescope prevention plates are attached to both ends in the axial direction. Takes the form.
- FRP fiber reinforced plastic
- the telescope prevention plate on the upstream side of the fluid separation element has a sealing member called a brine seal, which prevents the raw water from short-passing into the gap between the outer shell of the fluid separation element and the pressure vessel.
- 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.
- a fluid separation element When using a fluid separation element, about 1 to 6 fluid separation elements are loaded 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 processing.
- a fluid separation element is known in which a telescope prevention plate is provided with a groove in which the outer shell can be inserted in order to prevent the outer shell of the fluid separation element from moving in the axial direction of the fluid separation element (for example, a patent). Reference 1).
- the spiral wound body rotates in conjunction with it, which may cause the spiral wound structure to collapse or the separation membrane surface to be damaged.
- the problem behind the present invention is to prevent the outer shell and the telescope prevention plate from shifting in the rotation direction when raw water is supplied to the fluid separation element. Specifically, when a fluid separation element is loaded in a pressure vessel and operated, the outer shell is prevented from rotating even when a force is applied in the direction in which the outer shell rotates relative to the telescope prevention plate. The task is to do.
- the fluid separation element of the present invention has the following configuration.
- a spiral wound body in which the separation membrane and the raw water flow path material are wound in a spiral shape, an outer shell provided on the outer periphery of the spiral wound body, and both ends of the spiral wound body and the outer shell A fluid separation element having a telescope prevention plate provided, wherein the telescope prevention plate is formed on a second annular portion capable of holding the outer shell, and on an axially outer side of the second annular portion, A fluid separation element having at least a third annular portion made of an annular ring having an outer diameter larger than that of the second annular portion, and having one or more depressions on a side surface of the third annular portion on the spiral wound body side.
- the cross-sectional shape or position of the indentation that appears when the cross section of the third annular portion is taken on a plane including the central axis of the telescope prevention plate is different in the circumferential direction of the third annular portion.
- the telescoping prevention plate has a first annular portion that is formed on the inner side in the axial direction of the second annular portion and has a circular shape having an outer diameter larger than that of the second annular portion.
- the telescope prevention plate is formed on the outer side in the axial direction of the third annular part, formed on the outer side in the axial direction of the fourth annular part, a fourth annular part on which a brine seal can be extrapolated,
- the fluid separation element according to any one of (1) to (3), further including a fifth annular portion formed of an annular ring having an outer diameter larger than that of the fourth annular portion.
- the spiral wound body and the outer side of the fluid separation element having a spiral wound body in which the separation membrane and the raw water flow path material are wound in a spiral shape, and an outer shell provided on the outer periphery of the spiral wound body
- a telescope prevention plate provided at both ends of the shell, the second annular portion capable of holding the outer shell, and formed on the axially outer side of the second annular portion, and having an outer diameter larger than that of the second annular portion.
- a telescope prevention plate having at least a third annular portion made of a large ring and having one or more indentations on a side surface of the third annular portion on the spiral wound body side.
- the telescope prevention board as described in 5).
- the telescope according to (5) or (6) including a first annular portion that is formed on an inner side in the axial direction of the second annular portion and has an annular shape having an outer diameter larger than that of the second annular portion. Scope prevention plate.
- a fourth annular portion formed on the outer side in the axial direction of the third annular portion and capable of extrapolating a brine seal, and formed on the outer side in the axial direction of the fourth annular portion, outside the fourth annular portion.
- the telescope prevention plate according to any one of (5) to (7), further including a fifth annular portion formed of a ring having a large diameter.
- the effect obtained by the fluid separation element of the present invention is that the outer shell rotates relative to the telescope prevention plate even when a force is generated in the direction in which the outer shell or the telescope prevention plate rotates during use of the fluid separation element. This can be suppressed.
- there is a method of fixing the spiral wound body and the telescope prevention plate with a tape since the first annular portion and the second annular portion are covered with the tape, Even if a recess is provided in the first annular portion and the second annular portion, the recess may not exhibit an effect.
- the indentation can be effective even when the spiral winding body and the telescope prevention plate are fixed with tape, and an effective fluid Separation element manufacture becomes possible.
- FIG. 1 is a schematic partially developed view showing an embodiment of a spiral fluid separation element to which the present invention is applied.
- FIG. 2 is an enlarged cross-sectional view of the vicinity of the contact portion between the outer peripheral ring portion of the telescope prevention plate and the outer shell in the spiral fluid separation element of the present invention.
- FIG. 3 is an enlarged cross-sectional view of the vicinity of the contact portion between the outer peripheral ring portion of the telescope prevention plate and the outer shell when the brine seal is attached in the spiral fluid separation element of the present invention.
- FIG. 4 is a schematic view showing an embodiment of an envelope membrane used in the spiral fluid separation element of the present invention.
- FIG. 5 is a view of one preferred aspect of the shapes that can be taken by the telescope prevention plate of the present invention as seen from the spiral wound body side.
- FIG. 6 is a view of one preferred embodiment of shapes that can be taken by the telescoping prevention plate of the present invention, as viewed from the spiral wound body side.
- FIG. 7 is a view of one preferred embodiment of the shapes that can be taken by the telescope prevention plate of the present invention, as viewed from the spiral wound body side.
- FIG. 8 is a view of one preferred aspect of the shapes that can be taken by the telescope prevention plate of the present invention as seen from the spiral wound body side.
- FIG. 9 is a view of one preferred embodiment of shapes that can be taken by the telescope prevention plate of the present invention, as viewed from the spiral wound body side.
- FIG. 10 shows a more preferable cross-sectional shape around the portion where the water collecting pipe and the telescope prevention plate contact.
- FIG. 1 is a schematic partially developed view showing an embodiment of a fluid separation element to which the present invention is applied.
- the fluid separation element is a spiral type fluid separation element, and a permeate flow path material 5 is sandwiched between envelope films formed by bonding the three sides of the first separation membrane 3 and the second separation membrane 4 to each other.
- the raw water channel material 6 is prepared as a single unit or a plurality of units, and is wound around the water collecting pipe 1 in a spiral shape.
- the envelope membrane is composed of a first separation membrane 3 and a second separation membrane 4, and the first separation membrane 3 and the second separation membrane are formed on all sides of the four sides of the envelope membrane other than the water collecting pipe 1 side.
- the separation membrane 4 is bonded.
- 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 treated by an effective membrane portion 12 (see FIG. 4) that is a portion of the first separation membrane 3 and the second separation membrane 4 that are not bonded to each other. Is done.
- the permeated water 8 that has passed through the separation membranes 3 and 4 is taken out from the water collecting pipe 1, and the raw water 2 that has not passed through the separation membranes 3 and 4 is discharged as concentrated water 7 from the other end face of the fluid separation element.
- the spiral type fluid separation element has a configuration in which the outer peripheral portion is solidified by the outer shell 11 and the telescope prevention plates 9 are attached to both ends in the longitudinal direction.
- the material of the outer shell include fiber reinforced plastic (FRP) including urethane resin or epoxy resin, and plastic film including polyethylene or polypropylene.
- the outer shell is preferably an FRP shell made of fiber reinforced plastic (FRP) from the viewpoint of pressure resistance, and an FRP shell made of fiber reinforced plastic (FRP) containing glass fiber and epoxy resin from the viewpoint of heat resistance. More preferably.
- FIG. 2 is an enlarged cross-sectional view of the vicinity of the contact portion between the outer peripheral ring portion of the telescope prevention plate 9 and the outer shell 11 in the spiral fluid separation element of the present invention.
- 3 is an enlarged cross-sectional view of the vicinity of the contact portion between the outer peripheral ring portion of the telescope prevention plate 9 and the outer shell 11 when the brine seal 10 is attached in the spiral fluid separation element of the present invention.
- the telescoping prevention plate 9 of the present invention is formed with a second annular portion 19 that can hold the outer shell 11 and an axially outer side of the second annular portion, and a third that can lock the outer end of the outer shell 11. And an annular portion 20.
- the first annular portion 18 is formed on the inner side in the axial direction of the second annular portion 19 and is formed of an annular ring having an outer diameter larger than that of the second annular portion. Due to the presence of the first annular portion 18, a step is created between the second annular portion 19 and the first annular portion 18, making it easier to lock the outer shell 11, and the axial direction of the outer shell and the telescope prevention plate Can be further suppressed. And it has the hollow 25 in the side surface (specifically, side surface which becomes a spiral winding body side, when it is provided in the fluid separation element) of the 3rd annular part 20 at the axial inside.
- Japanese Patent No. 5742847 discloses a telescope prevention plate in which the fourth annular portion 21 and the fifth annular portion 22 do not exist.
- a part of the outer side surface of the third annular portion of the telescope prevention plate has a concavo-convex portion, and this concavo-convex portion has a shape complementary to the concavo-convex portion on the opposite telescope prevention plate.
- the concavo-convex portions can be liquid-tightly sealed between the telescope prevention plates facing each other by meshing complementarily with the facing concavo-convex portions, and satisfy the role of the brine seal 10.
- the fluid separation element of the present invention is formed in an envelope-like membrane, and a spiral formed by winding separation membranes 3 and 4 with a permeate flow channel material 5 sandwiched between them and a raw water flow channel material 6 around one of the water collecting pipes.
- the telescoping prevention plate 9 of the present invention is fixed to the end face of the winding body 17 with a tape or the like, and the resin composition for forming the outer shell is wound around the outer periphery of the spiral winding body 17 and the telescoping prevention plate 9, and then the resin composition It can be produced by curing the product.
- the outer shell 11 formed after curing is firmly fixed to the telescope prevention plate 9, Even when a force is applied in a direction in which the shell rotates with respect to the telescope prevention plate, the outer shell can be prevented from rotating.
- FIG. 5 is a view of one preferred aspect of the shapes that can be taken by the telescope prevention plate of the present invention, as viewed from the spiral wound body side.
- the telescope prevention plate 9 includes an outer ring portion 15 including a first annular portion 18, a second annular portion 19, a third annular portion 20, a fourth annular portion 21, and a fifth annular portion 22.
- the inner ring portion 16 is formed of a ring having an outer diameter smaller than that of the outer ring portion 15, and the spoke 24 that connects the outer ring portion 15 and the inner ring portion 16.
- the inner diameter of the inner ring portion 16 is preferably larger than the outer diameter of the water collecting pipe 1.
- a depression 25 is provided on the side surface of the spiral wound body.
- the cross-sectional shape or position of the recess 25 that appears when the cross section of the third annular portion 20 is taken on a plane passing through the central axis of the telescope prevention plate 9 is preferably different in the circumferential direction of the third annular portion 20.
- “the cross-sectional shape or position of the recess 25 that appears when the cross section of the third annular portion 20 is taken is different in the circumferential direction of the third annular portion 20” means that the central axis of the telescope prevention plate 9 is arbitrary.
- the shape or position that appears may differ depending on the plane.
- a brine seal 10 is extrapolated to the telescope prevention plate 9 upstream of the fluid separation element to prevent the raw water from short-passing into the gap between the outer shell of the fluid separation element and the pressure vessel.
- the brine seal may be an O-ring or the like, but a U seal or a split ring seal is often used because of its ability to be loaded into a pressure vessel. In particular, 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.
- FIG. 5, FIG. 6, FIG. 7, FIG. 8, and FIG. 9 are views of a preferred embodiment of the shapes that can be taken by the telescope prevention plate of the present invention as seen from the spiral wound body side.
- FIG. 5 there is a method of providing a total of twelve depressions 25, one for every 30 degrees, on the side surface 23 on the spiral side of the third annular portion.
- a shape in which a recess 25 exists in the outer peripheral portion of the side surface 23 on the spiral side of the third annular portion may be used.
- all the portions except for a part on the third annular portion spiral wound body side surface 23 may have a recess 25.
- the indentation 25 may be composed of a part of two or more concentric circular arcs having the same cross-sectional shape.
- the cross-sectional shape of the recess 25 that appears when the cross section of the third annular portion 20 is taken on a plane including the central axis of the telescope prevention plate 9 is uniform regardless of the plane, the position of the cross section of the recess 25 Is different, it is a preferable shape for exhibiting the effects of the present invention.
- the recess 25 opened on the side surface 23 of the third annular portion spiral wound body may be a through-hole penetrating the third annular portion 20.
- the brine seal 10 cannot be attached, so that it is preferable that it is a depression.
- the upper limit of the depth of the recess 25 is preferably a depth that does not become a through hole, and is preferably smaller than the thickness of the third annular portion 20 of the telescope prevention plate 9.
- the number of recesses for preventing rotation is preferably 1 or more.
- the total volume of the recesses 25 is preferably 0.05% or more, more preferably 0.5% or more of the total volume of the third annular portion 20 in order to exhibit the rotation suppressing effect. As the total volume of the recess 25 increases, the amount of epoxy resin required for forming the outer shell increases, so the total volume of the recess 25 is preferably less than about 5% of the total volume of the third annular portion 20.
- FIG. 10 shows a more preferable cross-sectional shape around the portion where the water collecting pipe 1 and the telescope prevention plate 9 are in contact. More preferably, as shown in FIG. 10, a structure in which a recess 26 is provided in a portion where the telescope prevention plate 9 on the water collecting pipe 1 and the water collecting pipe 1 are in contact with each other is good. Further, the recess 26 may be provided at a portion on the telescope prevention plate 9 where the telescope prevention plate 9 and the water collecting pipe 1 are in contact. At this time, the water collection pipe 1 and the telescope prevention plate 9 are bonded to each other with an adhesive, and the adhesive enters the depression of the water collection pipe and is cured, so that the telescope prevention plate 9 is attached to the water collection pipe 1. Rotation can be suppressed.
- each recess 25 is 4 mm in diameter and 2 mm in depth, and the total volume of the recess 25 is 339 mm 3 , which occupies 0.5% of the total volume of the third annular portion 20.
- the fluid separation element comprises a spiral wound body 17 formed by spirally winding a first separation membrane 3, a second separation membrane 4, a permeate flow path material 5, and a raw water flow path material 6.
- An outer shell 11 made of FRP is provided on the outer periphery, and a telescopic prevention plate 9 is disposed at both ends of the spiral wound body 17 and the outer shell 11.
- FIG. 4 is a schematic view showing an embodiment of an envelope membrane used in the spiral fluid separation element of the present invention.
- the envelope membrane used in the spiral wound body 17 is shown in FIG.
- One separation membrane 3 is combined so as to be 40 mm shorter than the second separation membrane 4.
- the adhesive used for bonding the first separation membrane 3 and the second separation membrane 4 leaks entirely or partially from the outer peripheral bonding portion 14 of the envelope-like membrane.
- membrane are being fixed with the adhesive agent entirely or partially. Further, the adhesive touches only the portions other than the effective membrane portion 12 of the first separation membrane 3 and the second separation membrane 4.
- the area of the effective film part 12 is 0.7 m 2 or more.
- test water flow test was performed using the fluid separation element described above.
- One fluid separation element was loaded in the pressure vessel and operated for 5 hours a day for 5 days.
- Test water is obtained by adding iron (III) chloride and polyacrylamide as flocculants to a 2,000 ppm suspension of wheat flour.
- the operating pressure is 0.5 MPa.
- Measured rotation angle of outer shell relative to telescope prevention plate after 5 days of operation was 0 degree.
- a fluid separation element was manufactured by using a telescope prevention plate having no depression on the surface (side surface of the third annular portion on the spiral wound body side) in contact with the outer shell end surface.
- the fluid separation element has an outer periphery of a spiral wound body 17 in which a first separation membrane 3, a second separation membrane 4, a permeate flow channel material 5, and a raw water flow channel material 6 are wound in a spiral shape.
- the outer shell 11 made of FRP is provided, and the telescoping prevention plate 9 is disposed at both ends of the spiral wound body 17 and the outer shell 11.
- test water flow test was conducted using this fluid separation element.
- One fluid separation element was loaded in the pressure vessel and operated for 5 hours a day for 5 days.
- Test water is obtained by adding iron (III) chloride and polyacrylamide as flocculants to a 2,000 ppm suspension of wheat flour.
- the operating pressure is 0.5 MPa.
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- Chemical Kinetics & Catalysis (AREA)
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Organic Chemistry (AREA)
- Separation Using Semi-Permeable Membranes (AREA)
Abstract
Description
従来技術として、流体分離素子の外側シェルが流体分離素子の軸方向に動くことを防ぐために、テレスコープ防止板に外側シェルを外挿できる溝を設けた流体分離素子が知られている(例えば特許文献1参照。)。
(1)分離膜および原水流路材がスパイラル状に巻回されてなるスパイラル巻体と、該スパイラル巻体の外周に設けられた外側シェルと、前記スパイラル巻体および前記外側シェルの両端部に設けられたテレスコープ防止板とを有する流体分離素子であって、前記テレスコープ防止板が、前記外側シェルを保持可能な第2環状部と、前記第2環状部の軸方向外側に形成され、前記第2環状部よりも外径が大きい円環からなる第3環状部とを少なくとも有し、前記第3環状部の前記スパイラル巻体側の側面上に1つ以上のくぼみを持つ流体分離素子。
(2)前記テレスコープ防止板の中心軸を含む平面で前記第3環状部の断面を取った場合に現れる、前記くぼみの断面形状または位置が前記第3環状部の周方向において異なる、前記(1)に記載の流体分離素子。
(3)前記テレスコープ防止板が、前記第2環状部の軸方向内側に形成され、前記第2環状部よりも外径が大きい円環からなる第1環状部を有する、前記(1)または(2)に記載の流体分離素子。
(4)前記テレスコープ防止板が、前記第3環状部の軸方向外側に形成され、ブラインシールを外挿可能な第4環状部と、前記第4環状部の軸方向外側に形成され、前記第4環状部よりも外径が大きい円環からなる第5環状部とを有する、前記(1)~(3)のいずれか1つに記載の流体分離素子。
(5)分離膜および原水流路材がスパイラル状に巻回されてなるスパイラル巻体と、該スパイラル巻体の外周に設けられた外側シェルとを有する流体分離素子の前記スパイラル巻体および前記外側シェルの両端部に設けられるテレスコープ防止板であって前記外側シェルを保持可能な第2環状部と、前記第2環状部の軸方向外側に形成され、前記第2環状部よりも外径が大きい円環からなる第3環状部とを少なくとも有し、前記第3環状部の前記スパイラル巻体側の側面上に1つ以上のくぼみを持つテレスコープ防止板。
(6)前記テレスコープ防止板の中心軸を含む平面で前記第3環状部の断面を取った場合に現れる、前記くぼみの断面形状または位置が前記第3環状部の周方向において異なる、前記(5)に記載のテレスコープ防止板。
(7)前記第2環状部の軸方向内側に形成され、前記第2環状部よりも外径が大きい円環からなる第1環状部を有する、前記(5)または(6)に記載のテレスコープ防止板。
(8)前記第3環状部の軸方向外側に形成され、ブラインシールを外挿可能な第4環状部と、前記第4環状部の軸方向外側に形成され、前記第4環状部よりも外径が大きい円環からなる第5環状部とを有する、前記(5)~(7)のいずれか1つに記載のテレスコープ防止板。
また、流体分離素子を製造する際に、スパイラル巻体とテレスコープ防止板をテープで固定する方法があるが、このとき、第1環状部および第2環状部はテープで被覆されるため、第1環状部および第2環状部にくぼみを設けても、くぼみは効果を発揮しないことがある。くぼみの位置を第3環状部のスパイラル巻体側側面に限定することで、スパイラル巻体とテレスコープ防止板をテープで固定した場合にもくぼみが効果を発揮することが可能となり、効果的な流体分離素子製造が可能となる。
流体分離素子はスパイラル型流体分離素子であり、第1の分離膜3および第2の分離膜4の3辺を互いに接着して形成した封筒状膜の間に透過水流路材5を挟み込み、これと原水流路材6とを1つのユニットとして、単数もしくは複数ユニット用意し、集水管1の周囲にスパイラル状に巻き付けてなる。封筒状膜は第1の分離膜3と第2の分離膜4からなり、封筒状膜の4辺のうち、集水管1側以外の全ての辺において、第1の分離膜3と第2の分離膜4が接着された構造をしている。封筒状膜は集水管1側で開口している。原水2は、流体分離素子の一方の端面から供給され、第1の分離膜3および第2の分離膜4の、互いに接着されていない部分である有効膜部12(図4参照。)で処理される。分離膜3,4を透過した透過水8は集水管1から取り出され、分離膜3,4を透過しなかった原水2は、流体分離素子の他方の端面から濃縮水7として排出される。
また、図3は、本発明のスパイラル型流体分離素子のうち、ブラインシール10を取り付けた時のテレスコープ防止板9の外周環部と外側シェル11との接触部付近の断面拡大図である。
この例では、テレスコープ防止板の第3環状部の外側側面の一部が凹凸部を有し、この凹凸部は、向かい合うテレスコープ防止板上の凹凸部と相補的な形状となっている。凹凸部は、向かい合う凹凸部と相補的にかみ合うことで向かい合うテレスコープ防止板同士を液密にシール可能であり、ブラインシール10の役割を満たす。
好ましい一態様としては、例えば図5のように、第3環状部スパイラル巻体側側面23上に、30度毎に1つ、計12個のくぼみ25を設ける方法があげられる。
くぼみ25の深さの上限は、貫通孔にならない範囲の深さが好ましく、テレスコープ防止板9の第3環状部20の厚みより小さいことが好ましい。
くぼみ25の総体積が大きくなると、外側シェルの形成に必要となるエポキシ樹脂量が増えるため、くぼみ25の総体積は、第3環状部20の総体積の5%未満程度が好ましい。
図5に示したように、テレスコープ防止板9の第3環状部スパイラル巻体側側面23上に、30度毎に1個、合計12個のくぼみ25を設けた。それぞれのくぼみ25の形状は直径4mm、深さ2mmであり、くぼみ25の総体積は339mm3であり、これは第3環状部20の総体積の0.5%を占める。
試験水は小麦粉2,000ppm懸濁液に、凝集剤として塩化鉄(III)とポリアクリルアミドを加えたものである。運転圧力は0.5MPaである。
テレスコープ防止板の外側シェル端面と接する面(第3環状部のスパイラル巻体側の側面)上にくぼみがないものを用いて流体分離素子を製造した。
流体分離素子は図1のように、第1の分離膜3、第2の分離膜4、透過水流路材5および原水流路材6がスパイラル状に巻回されてなるスパイラル巻体17の外周にFRPからなる外側シェル11が設けられると共に、スパイラル巻体17および外側シェル11の両端部にテレスコープ防止板9が配設された構造を有する。
試験水は小麦粉2,000ppm懸濁液に、凝集剤として塩化鉄(III)とポリアクリルアミドを加えたものである。運転圧力は0.5MPaである。
2:原水
3:第1の分離膜
4:第2の分離膜
5:透過水流路材
6:原水流路材
7:濃縮水
8:透過水
9:テレスコープ防止板
10:ブラインシール
11:外側シェル
12:有効膜部
13:封筒状膜の外周方向端部
14:封筒状膜の外周接着部
15:外環部
16:内環部
17:スパイラル巻体
18:第1環状部
19:第2環状部
20:第3環状部
21:第4環状部
22:第5環状部
23:第3環状部スパイラル巻体側側面
24:スポーク
25:くぼみ
26:くぼみ
Claims (8)
- 分離膜および原水流路材がスパイラル状に巻回されてなるスパイラル巻体と、該スパイラル巻体の外周に設けられた外側シェルと、前記スパイラル巻体および前記外側シェルの両端部に設けられたテレスコープ防止板とを有する流体分離素子であって、
前記テレスコープ防止板が、前記外側シェルを保持可能な第2環状部と、前記第2環状部の軸方向外側に形成され、前記第2環状部よりも外径が大きい円環からなる第3環状部とを少なくとも有し、
前記第3環状部の前記スパイラル巻体側の側面上に1つ以上のくぼみを持つ流体分離素子。 - 前記テレスコープ防止板の中心軸を含む平面で前記第3環状部の断面を取った場合に現れる、前記くぼみの断面形状または位置が前記第3環状部の周方向において異なる、請求項1に記載の流体分離素子。
- 前記テレスコープ防止板が、
前記第2環状部の軸方向内側に形成され、前記第2環状部よりも外径が大きい円環からなる第1環状部を有する、請求項1または2に記載の流体分離素子。 - 前記テレスコープ防止板が、
前記第3環状部の軸方向外側に形成され、ブラインシールを外挿可能な第4環状部と、
前記第4環状部の軸方向外側に形成され、前記第4環状部よりも外径が大きい円環からなる第5環状部とを有する、請求項1~3のいずれか1項に記載の流体分離素子。 - 分離膜および原水流路材がスパイラル状に巻回されてなるスパイラル巻体と、該スパイラル巻体の外周に設けられた外側シェルとを有する流体分離素子の前記スパイラル巻体および前記外側シェルの両端部に設けられるテレスコープ防止板であって、
前記外側シェルを保持可能な第2環状部と、前記第2環状部の軸方向外側に形成され、前記第2環状部よりも外径が大きい円環からなる第3環状部とを少なくとも有し、
前記第3環状部の前記スパイラル巻体側の側面上に1つ以上のくぼみを持つテレスコープ防止板。 - 前記テレスコープ防止板の中心軸を含む平面で前記第3環状部の断面を取った場合に現れる、前記くぼみの断面形状または位置が前記第3環状部の周方向において異なる、請求項5に記載のテレスコープ防止板。
- 前記第2環状部の軸方向内側に形成され、前記第2環状部よりも外径が大きい円環からなる第1環状部を有する、請求項5または6に記載のテレスコープ防止板。
- 前記第3環状部の軸方向外側に形成され、ブラインシールを外挿可能な第4環状部と、
前記第4環状部の軸方向外側に形成され、前記第4環状部よりも外径が大きい円環からなる第5環状部とを有する、請求項5~7のいずれか1項に記載のテレスコープ防止板。
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