Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
  • B01D—SEPARATION
  • B01D19/00—Degasification of liquids
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
  • B01D—SEPARATION
  • B01D61/00—Processes of separation using semi-permeable membranes, e.g. dialysis, osmosis or ultrafiltration; Apparatus, accessories or auxiliary operations specially adapted therefor
• • 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
• • 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
  • B01D63/02—Hollow fibre modules
• • 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
  • B01D63/02—Hollow fibre modules
  • B01D63/04—Hollow fibre modules comprising multiple hollow fibre assemblies

Definitions

• the present disclosure relates to a degassing element, a degassing module, and a method for degassing a liquid.
• degassing modules that degas liquids using degassing elements with multiple hollow fiber membranes have been known. Also known are degassing modules that connect multiple degassing elements to accommodate larger sizes or larger flow rates (see, for example, Patent Document 1).
• degassing of liquids is often done in sweep mode.
• sweep mode the liquid is supplied to the outside of the hollow fiber membrane and a sweep gas is circulated inside the hollow fiber membrane to degas the liquid.
• vacuum mode the liquid is supplied to the outside of the hollow fiber membrane and the inside of the hollow fiber membrane is sucked (vacuum drawn) to degas the liquid.
• vacuum mode the pressure difference between the inside and outside of the hollow fiber membrane is larger than in sweep mode, so more gas passes through the hollow fiber membrane than in sweep mode.
• the hollow fiber membrane is formed elongated (thin and long) to increase the membrane area (contact area with the liquid), so the pressure loss of the fluid flowing through the hollow fiber membrane is high.
• a conventional degassing module to degas a liquid in vacuum mode
• suctioning the inside of the hollow fiber membrane from both sides of the degassing element the structure around the degassing element in the degassing module becomes complicated. This makes it difficult to assemble and disassemble the degassing module, and reduces the maintainability of the degassing module.
• the structure around the degassing element in the degassing module becomes even more complicated.
• the objective of this disclosure is to provide a degassing element, a degassing module, and a method for degassing liquids that have high degassing efficiency and can improve maintainability.
• the degassing element includes a liquid circulation pipe having a plurality of openings formed therein and extending in an extension direction; a plurality of hollow fiber membranes arranged around the liquid circulation pipe so as to extend along the liquid circulation pipe and cover the plurality of openings; a suction pipe extending along the liquid circulation pipe; a first fixing part located at a first element end which is an end in a first extension direction which is one direction in the extension direction, and fixing the plurality of hollow fiber membranes and the suction pipe to the liquid circulation pipe so as to seal between the liquid circulation pipe, the plurality of hollow fiber membranes, and the suction pipe and open the hollow portion of the liquid circulation pipe, the hollow portion of the plurality of hollow fiber membranes, and the hollow portion of the suction pipe; and a second fixing part located at a second element end which is an end in a second extension direction which is the opposite direction to the first extension direction in the extension direction, and fixing the plurality of hollow fiber membranes and the suction pipe to the liquid circulation pipe so as
• the degassing element In this degassing element, multiple hollow fiber membranes extending along the liquid flow pipe are arranged around the liquid flow pipe so as to cover the multiple openings. Therefore, when the hollow parts of the multiple hollow fiber membranes are sucked and liquid is supplied to the liquid flow pipe, the liquid comes out of the liquid flow pipe from the multiple openings and comes into contact with the multiple hollow fiber membranes, thereby being degassed.
• the degassing element is provided with a suction pipe extending along the liquid flow pipe.
• the first fixing part located at the end of the first element fixes the multiple hollow fiber membranes and the suction pipe to the liquid flow pipe so as to seal between the liquid flow pipe, the multiple hollow fiber membranes, and the suction pipe, and to open the hollow part of the liquid flow pipe, the hollow parts of the multiple hollow fiber membranes, and the hollow part of the suction pipe.
• the second fixing part located at the end of the second element fixes the multiple hollow fiber membranes and the suction pipe to the liquid flow pipe so as to seal between the liquid flow pipe, the multiple hollow fiber membranes, and the suction pipe, and to open the hollow part of the liquid flow pipe, the hollow parts of the multiple hollow fiber membranes, and the hollow part of the suction pipe.
• the openings of the hollow parts of the hollow fiber membranes are connected to the openings of the hollow part of the suction pipe at either the first element end or the second element end, and the hollow parts of the hollow fiber membranes and the hollow part of the suction pipe are sucked from the other of either the first element end or the second element end. Then, this suction force is transmitted through the hollow part of the suction pipe, so that the hollow parts of the hollow fiber membranes are sucked from both the second element end side and the first element end side. In other words, even if suction ports for sucking the hollow parts of the hollow fiber membranes are not arranged at both the first element end and the second element end, the hollow parts of the hollow fiber membranes can be sucked from both ends in the extension direction. This simplifies the structure of the degassing module using the degassing element, and therefore maintainability can be improved while maintaining high degassing efficiency.
• the cross-sectional area of the hollow part of the suction pipe may be larger than the total cross-sectional area of the hollow parts of the hollow fiber membranes.
• the pressure loss (suction loss) caused by suction of the hollow part of the suction pipe can be made smaller than the pressure loss (suction loss) caused by suction of the hollow parts of the hollow fiber membranes.
• the hollow parts of the hollow fiber membranes and the hollow part of the suction pipe are connected at either the first element end or the second element end, and the hollow parts of the hollow fiber membranes and the hollow part of the suction pipe are sucked at the other of either the first element end or the second element end, it becomes easier to suck the hollow parts of the hollow fiber membranes from either the first element end or the second element end.
• the shape of the suction pipe is not as restricted as that of the hollow fiber membranes, so the cross-sectional area of the hollow part of the suction pipe can be easily made larger than the total cross-sectional area of the hollow parts of the hollow fiber membranes.
• the suction pipe may be arranged outside the hollow fiber membranes.
• the suction pipe is arranged outside the hollow fiber membranes, which makes it easier to arrange the hollow fiber membranes around the liquid flow pipe and prevents the suction pipe from interfering with the degassing of the liquid.
• the degassing element described in [1] above may be provided with multiple suction pipes.
• This degassing element has multiple suction pipes, which makes it easier to transmit the suction force.
• the total cross-sectional area of the hollow parts of the multiple suction pipes may be larger than the total cross-sectional area of the hollow parts of the multiple hollow fiber membranes.
• the pressure loss caused by suction of the hollow parts of the multiple suction pipes can be made smaller than the pressure loss caused by suction of the hollow parts of the multiple hollow fiber membranes.
• the multiple suction pipes may be arranged around the multiple hollow fiber membranes.
• the multiple suction pipes are arranged around the multiple hollow fiber membranes, making it easier to arrange the multiple hollow fiber membranes around the liquid flow pipe and preventing the multiple suction pipes from hindering the degassing of the liquid.
• the degassing module comprises a degassing element according to any one of [1] to [8] above, a housing for accommodating the degassing element, a first end communication space forming part connected to an end of the first element, and a partition part dividing the area within the housing into an internal area including the hollow parts of the hollow fiber membranes and the hollow part of the suction pipe and an external area including the hollow part of the liquid circulation pipe, with the hollow fiber membranes as boundaries.
• the first end communication space forming part forms a first end communication space that communicates between the hollow parts of the hollow fiber membranes and the hollow part of the suction pipe, and the housing has a liquid supply port for supplying liquid to the hollow part of the liquid circulation pipe, a liquid discharge port for discharging liquid discharged from the liquid circulation pipe, and a suction port for sucking the internal area.
• the partition divides the area inside the housing into an internal area including the hollow parts of the hollow fiber membranes and the hollow part of the suction pipe, and an external area including the hollow part of the liquid flow pipe, with the hollow fiber membranes as the boundary.
• the housing has a liquid supply port for supplying liquid to the hollow part of the liquid flow pipe, a liquid discharge port for discharging liquid from the liquid flow pipe, and a suction port for sucking the internal area.
• the first end communication space forming part connected to the first element end forms a first end communication space that communicates the hollow parts of the hollow fiber membranes and the hollow part of the suction pipe.
• a second end communication space that is connected to the hollow portions of the hollow fiber membranes and the hollow portion of the suction pipe is formed on the second extension direction side of the degassing element, and the suction port may be adjacent to the second end communication space and connected to the second end communication space.
• a second end communication space that is connected to the hollow portions of the hollow fiber membranes and the hollow portion of the suction pipe is formed on the second extension direction side of the degassing element, and the suction port is adjacent to the second end communication space and connected to the second end communication space. Therefore, the hollow portions of the hollow fiber membranes can be sucked from the suction port with a simple configuration.
• the degassing element may have an intermediate baffle that blocks the hollow portion of the liquid flow pipe at the element intermediate portion between the first element end and the second element end.
• the intermediate baffle blocks the hollow portion of the liquid flow pipe at the element intermediate portion between the first element end and the second element end. Therefore, the liquid supplied to the hollow portion of the liquid flow pipe from the liquid supply port is prevented from flowing in the extension direction by the intermediate baffle, so that on the upstream side of the intermediate baffle, the liquid exits the liquid flow pipe from the multiple openings, comes into contact with the multiple hollow fiber membranes and is degassed, and returns to the hollow portion of the liquid flow pipe on the downstream side of the intermediate baffle. This allows the contact time between the liquid and the multiple hollow fiber membranes to be extended.
• the partition may have a first sealing portion that seals between the first fixing portion and the housing, and a second sealing portion that seals between the second fixing portion and the housing.
• the partition has a first sealing portion that seals between the first fixing portion and the housing, and a second sealing portion that seals between the second fixing portion and the housing, so that the internal region and the external region can be separated with a simple configuration.
• the liquid discharge port may be connected to an end of the liquid circulation pipe in the first extension direction.
• the liquid discharge port since the liquid discharge port is connected to the end of the liquid circulation pipe in the first extension direction, the liquid that has come out of the liquid circulation pipe from the multiple openings can be returned from the multiple openings to the hollow portion of the liquid circulation pipe, and then discharged from the liquid discharge port.
• the degassing module described in [9] above may include a plurality of degassing elements arranged in the extension direction, and between adjacent degassing elements in the extension direction, the hollow portions of the hollow fiber membranes and the hollow portions of the suction pipes may be connected to each other, and the hollow portions of the liquid flow pipes may be connected to each other.
• this degassing module multiple degassing elements are arranged in the extension direction, and the hollow parts of the multiple hollow fiber membranes and the hollow parts of the suction pipes are connected to each other between adjacent degassing elements in the extension direction, and the hollow parts of the liquid flow pipes are connected to each other. Therefore, when the suction port is sucked, the suction force is transmitted to the first end communication space through the hollow parts of the suction pipes of the multiple degassing elements, and the hollow parts of the multiple hollow fiber membranes of the multiple degassing elements are sucked from both sides of the second element end side of the second end degassing element and the first element end side of the first end degassing element.
• the hollow parts of the multiple hollow fiber membranes can be sucked from both ends in the extension direction. This simplifies the structure of the degassing module.
• the liquid supply port may be connected to an end of a liquid circulation pipe in the second extension direction of a second end degassing element that is located at the end in the second extension direction of the multiple degassing elements.
• liquid can be supplied from the liquid supply port to the liquid circulation pipe with a simple configuration.
• the degassing module described in [17] or [18] above further includes an element connection part that arranges a first side degassing element located on the first extension direction side of the degassing elements adjacent in the extension direction and a second side degassing element located on the second extension direction side of the degassing elements adjacent in the extension direction at a distance in the extension direction, and the element connection part may form an intermediate communication space that communicates with the hollow parts of the hollow fiber membranes of the first side degassing element and the hollow part of the suction pipe and the hollow parts of the hollow fiber membranes of the second side degassing element and the hollow part of the suction pipe, and an intermediate liquid flow passage that communicates with the hollow part of the liquid flow pipe of the first side degassing element and the hollow part of the liquid flow pipe of the second side degassing element.
• a first side degassing element located in a first extension direction among adjacent degassing elements in the extension direction, and a second side degassing element located in a second extension direction among adjacent degassing elements in the extension direction are arranged at a distance in the extension direction by an element connection part, and the element connection part forms an intermediate communication space communicating with the hollow portions of the hollow fiber membranes and the hollow portion of the suction pipe of the first side degassing element and the hollow portions of the hollow fiber membranes and the hollow portion of the suction pipe of the second side degassing element, and an intermediate liquid flow passage communicating with the hollow portion of the liquid flow pipe of the first side degassing element and the hollow portion of the liquid flow pipe of the second side degassing element.
• the suction force acting on the hollow portions of the hollow fiber membranes and the hollow portion of the suction pipe can be transmitted to each other, and liquid can be circulated. Furthermore, when the hollow portions of the hollow fiber membranes of the second side degassing element and the hollow portion of the suction pipe are sucked from the suction port, this suction force is transmitted through the hollow portions of the suction pipes of the degassing elements to the intermediate communication space and the first end communication space. This makes it possible to suck the hollow portions of the hollow fiber membranes of the degassing elements from both the second element end side of the second end degassing element and the first element end side of the first end degassing element.
• the element connection part may have a connecting cover connected to the second fixing part of the first side degassing element and the first fixing part of the second side degassing element, covering the space between the first side degassing element and the second side degassing element, and a connecting pipe connected to the liquid flow pipe of the first side degassing element and the liquid flow pipe of the second side degassing element.
• the element connection part has a connecting cover connected to the second fixing part of the first side degassing element and the first fixing part of the second side degassing element, covering the space between the first side degassing element and the second side degassing element, and a connecting pipe connected to the liquid flow pipe of the first side degassing element and the liquid flow pipe of the second side degassing element. Therefore, with a simple configuration, the hollow parts of the hollow fiber membranes and the hollow parts of the suction pipes can be connected to each other between the first side degassing element and the second side degassing element, and the hollow parts of the liquid flow pipes can be circulated to each other.
• the partition may seal between the second fixing portion of the second end degassing element and the housing.
• the partition seals between the second fixing portion of the second end degassing element and the housing, so that the internal region and the external region can be separated with a simple configuration.
• each of the multiple degassing elements has an intermediate baffle that blocks the hollow part of the liquid flow pipe in the element intermediate part between the first element end and the second element end, the first end communication space forming part is connected to the first element end of the first end degassing element located at the end of the multiple degassing elements in the first extension direction, the first end communication space communicates the hollow parts of the multiple hollow fiber membranes of the first end degassing element and the hollow part of the suction pipe of the first end degassing element, a second end communication space that communicates with the hollow parts of the multiple hollow fiber membranes and the hollow part of the suction pipe is formed on the second extension direction side of the second end degassing element located at the end of the multiple degassing elements in the second extension direction, and the suction port may be adjacent to the second end communication space and communicated with the second end communication space.
• each of the multiple degassing elements has an intermediate baffle that blocks the hollow portion of the liquid flow pipe in the middle of the element between the first element end and the second element end. Therefore, in each degassing element, the liquid supplied to the liquid supply port is prevented from flowing in the extension direction by the intermediate baffle, so that on the upstream side of the intermediate baffle, the liquid exits the liquid flow pipe through the multiple openings, comes into contact with the multiple hollow fiber membranes and is degassed, and returns to the hollow portion of the liquid flow pipe on the downstream side of the intermediate baffle. This makes it possible to increase the contact time between the liquid and the multiple hollow fiber membranes.
• the partition portion may have a first sealing portion that seals between the housing and the first fixed portion of the first side degassing element located on the first extension direction side of the degassing elements adjacent to each other in the extension direction, a second sealing portion that seals between the housing and the second fixed portion of the first side degassing element, a third sealing portion that seals between the housing and the first fixed portion of the second side degassing element located on the second extension direction side of the degassing elements adjacent to each other in the extension direction, and a fourth sealing portion that seals between the housing and the second fixed portion of the second side degassing element.
• the partition has a first sealing portion that seals between the first fixing portion of the first side degassing element and the housing, a second sealing portion that seals between the second fixing portion of the first side degassing element and the housing, a third sealing portion that seals between the first fixing portion of the second side degassing element and the housing, and a fourth sealing portion that seals between the second fixing portion of the second side degassing element and the housing, so that the internal and external regions can be separated with a simple configuration.
• the liquid discharge port may be connected to an end of the liquid circulation pipe in the first extension direction of a first end degassing element that is located at the end in the first extension direction of the multiple degassing elements.
• the liquid discharge port since the liquid discharge port is connected to the end of the liquid circulation pipe in the first extension direction of the first end degassing element, the liquid that has come out of the liquid circulation pipe from the multiple openings can be returned from the multiple openings to the hollow portion of the liquid circulation pipe and then discharged from the liquid discharge port.
• the housing has a cylindrical portion in which the degassing element is accommodated, a first lid portion connected to one end of the cylindrical portion and having a liquid discharge port, and a second lid portion connected to the end of the cylindrical portion opposite the first lid portion and having a liquid supply port, and at least one of the first lid portion and the second lid portion may have a suction port.
• the housing has a cylindrical portion in which the degassing element is accommodated, a first lid portion connected to one end of the cylindrical portion and having a liquid discharge port, and a second lid portion connected to the end of the cylindrical portion opposite the first lid portion and having a liquid supply port, and at least one of the first lid portion and the second lid portion has a suction port.
• the method for degassing a liquid according to the present disclosure is a method for degassing a liquid using a degassing module described in any one of [9] to [28] above, in which the suction port of the degassing module is sucked and liquid is supplied to the liquid supply port of the degassing module.
• the hollow fiber membranes 22 are formed, for example, by a hollow fiber membrane fabric (not shown) woven in a blind shape.
• the hollow fiber membrane fabric is a fabric in which a plurality of hollow fiber membranes 22 serving as weft threads are woven with warp threads (not shown).
• the plurality of hollow fiber membranes 22 are arranged in a blind shape.
• the hollow fiber membrane fabric is wrapped around the liquid flow pipe 21 so that the plurality of hollow fiber membranes 22 extend in the extension direction D to cover the plurality of openings 21d.
• the hollow portion 23a of the suction pipe 23 is a flow path (internal pipe flow path) through which gas G can flow, and is formed by the inner peripheral surface of the suction pipe 23.
• the multiple suction pipes 23 extend over the entire area in the extension direction D of the degassing element 2. In other words, the multiple suction pipes 23 extend from the end of the degassing element 2 in the first extension direction D1 to the end of the degassing element 2 in the second extension direction D2.
• the hollow portions 23a of the multiple suction pipes 23 are open in the first extension direction D1 and the second extension direction D2.
• the hollow portions 23a of the multiple suction pipes 23 refer to the respective hollow portions 23a of the multiple suction pipes 23.
• the first fixing part 24 is located at the first element end 2a and fixes the multiple hollow fiber membranes 22 and the multiple suction pipes 23 to the liquid flow pipe 21 so as to seal between the liquid flow pipe 21, the multiple hollow fiber membranes 22, and the suction pipe 23 and open the hollow portions 22a of the multiple hollow fiber membranes 22 and the hollow portions 23a of the multiple suction pipes 23.
• the first fixing part 24 fixes the ends of the multiple hollow fiber membranes 22 and the multiple suction pipes 23 on the first extension direction D1 side to the liquid flow pipe 21. The first fixing part 24 then seals between the liquid flow pipe 21, the multiple hollow fiber membranes 22, and the multiple suction pipes 23.
• first fixing portion 24 located at the first element end portion 2a fixes the hollow fiber membranes 22 and the suction pipes 23 to the liquid flow pipe 21 so as to seal between the liquid flow pipe 21, the hollow fiber membranes 22, and the suction pipes 23, and open the hollow portion 21a of the liquid flow pipe 21, the hollow portion 22a of the hollow fiber membranes 22, and the hollow portion 23a of the suction pipes 23.
• the second fixing portion 25 located at the second element end portion 2b fixes the plurality of hollow fiber membranes 22 and the plurality of suction pipes 23 to the liquid flow pipe 21 so as to seal between the liquid flow pipe 21, the plurality of hollow fiber membranes 22, and the plurality of suction pipes 23, and to open the hollow portion 21a of the liquid flow pipe 21, the hollow portions 22a of the plurality of hollow fiber membranes 22, and the hollow portions 23a of the plurality of suction pipes 23.
• the openings of the hollow parts 22a of the hollow fiber membranes 22 and the openings of the hollow parts 23a of the suction pipes 23 are connected at either the first element end 2a or the second element end 2b, that is, either the first end hollow fiber membrane opening 22b or the second end hollow fiber membrane opening 22c is connected to either the first end suction pipe opening 23b or the second end suction pipe opening 23c, and the hollow parts 22a of the hollow fiber membranes 22 and the hollow parts 23a of the suction pipes 23 are sucked from the other of either the first element end 2a or the second element end 2b.
• this degassing element 2 has multiple suction pipes 23, making it even easier to transmit the suction force.
• the degassing module 1 includes the degassing element 2 according to the first embodiment described above, a housing 3, an end baffle 4, a first end communicating space forming portion 5, and a partition portion 6. Note that only the housing 3 is shown in cross section in Fig. 7.
• the liquid supply port 3a is provided in the second lid portion 33 and is a port that communicates between the inside and outside of the housing 3.
• the liquid supply port 3a extends in a pipe shape from the second lid portion 33 to the inside of the housing 3 and is connected to the end portion 21e of the liquid circulation pipe 21 on the second extension direction D2 side.
• the liquid supply port 3a is also connected to the hollow portion 21a of the liquid circulation pipe 21.
• the liquid L does not flow in a direction that presses the multiple hollow fiber membranes 22 against the liquid flow pipe 21, but flows in a direction that moves the multiple hollow fiber membranes 22 away from the liquid flow pipe 21.
• This makes it possible to suppress an increase in pressure loss when the liquid L passes through the multiple hollow fiber membranes 22, and therefore to suppress a decrease in the flow rate of the liquid L.
• a liquid supply device with relatively low output can be used to supply liquid L to the degassing module 1.
• the partition 6 seals the space between the second fixing part 25 and the housing 3, so that the internal region R1 and the external region R2 can be separated with a simple structure.
• the hollow portion 21a of the liquid flow pipe 21 is not provided with any member other than the end baffle 4 that blocks the movement of the liquid L in the extension direction D. Therefore, the liquid L that comes out of the liquid flow pipe 21 is discharged from the liquid discharge port 3b without returning to the liquid flow pipe 21.
• the suction force is transmitted to the first end communication space S1 through the hollow portions 23a of the multiple suction pipes 23, and the hollow portions 22a of the multiple hollow fiber membranes 22 can be sucked from both the second element end 2b side and the first element end side. Then, by supplying liquid L to the liquid supply port 3a, the liquid L is forced out of the liquid circulation pipe 21 through the multiple openings 21d, brought into contact with the multiple hollow fiber membranes 22, degassed, and discharged from the liquid discharge port 3b.
• the multiple degassing elements 2 are arranged in the extension direction D.
• the multiple degassing elements 2 are adjacent to each other in the extension direction D.
• the hollow portions 22a of the multiple hollow fiber membranes 22 and the hollow portions 23a of the multiple suction pipes 23 are connected to each other, and the hollow portions 21a of the liquid flow pipes 21 are connected to each other.
• the multiple degassing elements 2 are composed of a first end degassing element 2 ⁇ located at the end of the first extension direction D1 and a second end degassing element 2 ⁇ located at the end of the second extension direction D2.
• the degassing module 1A has two degassing elements.
• the first end degassing element 2 ⁇ is also the first side degassing element located on the first extension direction D1 side of the two degassing elements 2 adjacent to each other in the extension direction D.
• the second end degassing element 2 ⁇ is also the second side degassing element located on the second extension direction D2 side of the two degassing elements 2 adjacent to each other in the extension direction D.
• the element connection portion 7A forms an intermediate communication space S4 and an intermediate liquid flow passage S5.
• the intermediate communication space S4 is a space that communicates with the hollow portions 22a of the hollow fiber membranes 22 and the hollow portions 23a of the suction pipes 23 of the first end degassing element 2 ⁇ and the hollow portions 22a of the hollow fiber membranes 22 and the hollow portions 23a of the suction pipes 23 of the second end degassing element 2 ⁇ .
• the intermediate communication space S4 is also a space adjacent to the second end hollow fiber membrane opening 22c and the second end suction pipe opening 23c of the first end degassing element 2 ⁇ and the first end hollow fiber membrane opening 22b and the first end suction pipe opening 23b of the second end degassing element 2 ⁇ .
• the intermediate liquid flow passage S5 is a liquid flow passage that communicates with the hollow portion 21a of the liquid flow pipe 21 of the first end degassing element 2 ⁇ and the hollow portion 21a of the liquid flow pipe 21 of the second end degassing element 2 ⁇ .
• the intermediate liquid flow passage S5 is also a liquid flow passage that is adjacent to the second end liquid flow pipe opening 21c of the first end degassing element 2 ⁇ and the first end liquid flow pipe opening 21b of the second end degassing element 2 ⁇ .
• the connecting pipe 72A is a pipe that is connected to the liquid flow pipe 21 of the first end degassing element 2 ⁇ and the liquid flow pipe 21 of the second end degassing element 2 ⁇ .
• the connecting pipe 72A is connected to the liquid flow pipe 21 of the first end degassing element 2 ⁇ by fitting its end in the first extension direction D1 into the liquid flow pipe 21 of the first end degassing element 2 ⁇ .
• the connecting pipe 72A is also connected to the liquid flow pipe 21 of the second end degassing element 2 ⁇ by fitting its end in the second extension direction D2 into the liquid flow pipe 21 of the second end degassing element 2 ⁇ .
• the liquid L is not discharged in the first extension direction D1 from the second end degassing element 2 ⁇ , but is discharged from the multiple openings 21d formed in the liquid flow pipe 21 to the radial outside of the liquid flow pipe 21 in the first end degassing element 2 ⁇ and the second end degassing element 2 ⁇ .
• no member that blocks the movement of the liquid L in the extension direction D is provided in the hollow portion 21a and the intermediate communication space S4 of the liquid flow pipe 21 of the first end degassing element 2 ⁇ and the second end degassing element 2 ⁇ .
• the suction force is transmitted through the hollow portions 23a of the multiple suction pipes 23 of the second end degassing element 2 ⁇ and the first end degassing element 2 ⁇ to the intermediate communication space S4 and the first end communication space S1, so that the multiple hollow fiber membranes 22 of the first end degassing element 2 ⁇ and the second end degassing element 2 ⁇ are sucked in from both the second element end 2b side of the second end degassing element 2 ⁇ and the first element end 2a side of the first end degassing element 2 ⁇ .
• the hollow portions 22a of the hollow fiber membranes 22 can be sucked from both ends in the extension direction D without arranging suction ports for sucking the hollow portions 22a of the hollow fiber membranes 22 at both the first element end 2a and the second element end 2b.
• the liquid supply port 3a is connected to the end 21e of the liquid flow pipe 21 in the second extension direction D2 of the second end degassing element 2 ⁇ , so liquid can be supplied from the liquid supply port 3a to the liquid flow pipe 21 with a simple configuration.
• the first end degassing element 2 ⁇ and the second end degassing element 2 ⁇ , which are adjacent in the extension direction D, are arranged at a distance in the extension direction D by the element connection portion 7A, and the element connection portion 7A forms an intermediate communication space S4 that is connected to the hollow portions 22a of the multiple hollow fiber membranes 22 and the hollow portions 23a of the multiple suction pipes 23 of the first end degassing element 2 ⁇ and the hollow portions 22a of the multiple hollow fiber membranes 22 and the hollow portions 23a of the multiple suction pipes 23 of the second end degassing element 2 ⁇ , and an intermediate liquid flow passage S5 that is connected to the hollow portions 21a of the liquid flow pipe 21 of the first end degassing element 2 ⁇ and the hollow portions 21a of the liquid flow pipe 21 of the second end degassing element 2 ⁇ .
• the hollow portions 22a of the hollow fiber membranes 22 of the first end degassing element 2 ⁇ and the second end degassing element 2 ⁇ can be sucked from both the second element end 2b side of the second end degassing element 2 ⁇ and the first element end 2a side of the first end degassing element 2 ⁇ .
• the element connection part 7A is connected to the second fixing part 25 of the first end degassing element 2 ⁇ and the first fixing part 24 of the second end degassing element 2 ⁇ , and has a connecting cover 71A that covers the space between the first end degassing element 2 ⁇ and the second end degassing element 2 ⁇ , and a connecting pipe 72A that is connected to the liquid flow pipe 21 of the first end degassing element 2 ⁇ and the liquid flow pipe 21 of the second end degassing element 2 ⁇ .
• the hollow parts 22a of the multiple hollow fiber membranes 22 and the hollow parts 23a of the multiple suction pipes 23 can be connected to each other between the first end degassing element 2 ⁇ and the second end degassing element 2 ⁇ , and the hollow parts 21a of the liquid flow pipes 21 can be connected to each other.
• the end baffle 4 blocks the hollow portion 21a of the liquid flow pipe 21 of the first end degassing element 2 ⁇ .
• the first end communication space forming portion 5 is connected to the first element end portion 2a of the first end degassing element 2 ⁇ , and the first end communication space S1 communicates the hollow portion 22a of the multiple hollow fiber membranes 22 of the first end degassing element 2 ⁇ with the hollow portion 23a of the multiple suction pipes 23 of the first end degassing element 2 ⁇ .
• liquid L when liquid L is supplied to the liquid supply port 3a, the liquid L is supplied to the hollow portion 21a of the liquid flow pipe 21 in the first end degassing element 2 ⁇ and the second end degassing element 2 ⁇ , exits the liquid flow pipe 21 from the multiple openings 21d, and comes into contact with the multiple hollow fiber membranes 22 to be degassed. Thereafter, the liquid L that has been degassed by contacting the hollow fiber membranes 22 is discharged from the liquid discharge port 3b without returning to the hollow portion 21a of the liquid flow pipe 21.
• the liquid L can be brought out of the liquid flow pipe 21 from the plurality of openings 21d in the first end degassing element 2 ⁇ and the second end degassing element 2 ⁇ , degassed by contacting the plurality of hollow fiber membranes 22, and discharged from the liquid discharge port 3b.
• the first end communication space forming part 5B is connected to the first fixed part 24 of the first end degassing element 2 ⁇ so as to cover the first element end part 2a of the first end degassing element 2 ⁇ , similar to the first end communication space forming part 5 of the second embodiment. Also, the first end communication space forming part 5B forms a first end communication space S1 that communicates the hollow part 22a of the multiple hollow fiber membranes 22 of the first end degassing element 2 ⁇ and the hollow part 23a of the suction pipe 23 of the first end degassing element 2 ⁇ , similar to the first end communication space forming part 5 of the second embodiment.
• the first end communication space forming part 5B is formed larger than the first end communication space forming part 5 of the second embodiment so that the first end communication space S1 is larger than that of the second embodiment.
• the housing 3B accommodates the first end degassing element 2 ⁇ and the second end degassing element 2 ⁇ so that a space is formed between the first end degassing element 2 ⁇ and the second end degassing element 2 ⁇ .
• the housing 3B includes a cylindrical portion 31A in which the first end degassing element 2 ⁇ and the second end degassing element 2 ⁇ are accommodated, a first lid portion 32B connected to one end of the cylindrical portion 31A and having a liquid discharge port 3b and a first end suction port 3d, and a second lid portion 33 connected to the end of the cylindrical portion 31A opposite to the first lid portion 32 and having a liquid supply port 3a and a suction port 3c.
• the liquid degassing method according to the third embodiment is a method for degassing a liquid L by using a degassing module 1B.
• suction is applied to the suction port 3c and the first end suction port 3d of the degassing module 1B, and liquid L is supplied to the liquid supply port 3a of the degassing module 1A.
• the degassed liquid L passes through the space between the second end degassing element 2 ⁇ and the first end degassing element 2 ⁇ and the housing 3A, and is discharged from the liquid discharge port 3b.
• the gas G that has permeated the hollow fiber membranes 22 of the second end degassing element 2 ⁇ and the first end degassing element 2 ⁇ passes through the hollow parts 22a of the hollow fiber membranes 22 of the second end degassing element 2 ⁇ and the first end degassing element 2 ⁇ , the intermediate communication space S4, the first end communication space S1, the hollow parts 23a of the suction pipes 23 of the second end degassing element 2 ⁇ and the first end degassing element 2 ⁇ , and the second end communication space S3, and is discharged from the suction port 3c and the first end suction port 3d.
• the degassing module according to the fourth embodiment is basically the same as the degassing module 1A according to the second embodiment, but differs from the degassing module 1A according to the second embodiment in that the suction port is connected to the element connection part. Therefore, in the following description, only the differences from the degassing module 1A according to the second embodiment will be described, and the same description as the degassing module 1A according to the second embodiment will be omitted.
• Figure 15 is a schematic cross-sectional view of a degassing module according to a fourth embodiment.
• Figure 16 is a schematic cross-sectional view of the degassing module shown in Figure 15.
• the degassing module 1C according to this embodiment comprises a plurality of degassing elements 2, a housing 3C, an end baffle 4, a first end communicating space forming portion 5, a partition portion 6, and an element connection portion 7C. Note that only the housing 3C is shown in cross section in Figure 15.
• the element connection part 7C forms an intermediate communication space S4 that communicates with the hollow parts 22a of the hollow fiber membranes 22 and the hollow parts 23a of the suction pipes 23 of the first end degassing element 2 ⁇ and the hollow parts 22a of the hollow fiber membranes 22 and the hollow parts 23a of the suction pipes 23 of the second end degassing element 2 ⁇ .
• the element connection part 7C also forms an intermediate liquid flow passage S5 that communicates with the hollow parts 21a of the liquid flow pipe 21 of the first end degassing element 2 ⁇ and the hollow parts 21a of the liquid flow pipe 21 of the second end degassing element 2 ⁇ .
• the element connection part 7C is larger than the element connection part 7A of the second embodiment so that the intermediate communication space S4 and the intermediate liquid flow passage S5 are larger than those of the second embodiment.
• the element connection part 7C like the element connection part 7C of the second embodiment, has a connecting cover 71A that is connected to the second fixing part 25 of the first end degassing element 2 ⁇ and the first fixing part 24 of the second end degassing element 2 ⁇ and covers the space between the first end degassing element 2 ⁇ and the second end degassing element 2 ⁇ , and a connecting pipe 72A that is connected to the liquid flow pipe 21 of the first end degassing element 2 ⁇ and the liquid flow pipe 21 of the second end degassing element 2 ⁇ .
• the liquid degassing method according to the fourth embodiment is a method for degassing liquid L using a degassing module 1C.
• the degassed liquid L passes through the space between the second end degassing element 2 ⁇ and the first end degassing element 2 ⁇ and the housing 3A and is discharged from the liquid discharge port 3b.
• the gas G that has permeated the hollow fiber membranes 22 of the second end degassing element 2 ⁇ and the first end degassing element 2 ⁇ passes through the hollow portions 22a of the hollow fiber membranes 22 of the second end degassing element 2 ⁇ and the first end degassing element 2 ⁇ , the intermediate communication space S4, the first end communication space S1, the hollow portions 23a of the suction pipes 23 of the second end degassing element 2 ⁇ and the first end degassing element 2 ⁇ , and the second end communication space S3, and is discharged from the intermediate suction port 3e.
• FIG 17 is a schematic cross-sectional view of a degassing module according to the fourth embodiment.
• the degassing module 1D according to this embodiment comprises three degassing elements 2, a housing 3D, an end baffle 4 (see Figure 12), a first end communicating space forming portion 5, a partition portion 6, and two element connection portions 7A. Note that only the housing 3D is shown in cross section in Figure 17.
• the three multiple degassing elements 2 are arranged in the extension direction D and are adjacent to each other in the extension direction D.
• the three multiple degassing elements 2 are composed of a first end degassing element 2 ⁇ located at the end of the first extension direction D1, a second end degassing element 2 ⁇ located at the end of the second extension direction D2, and an intermediate degassing element 2 ⁇ located between the first end degassing element 2 ⁇ and the second end degassing element 2 ⁇ .
• the first end degassing element 2 ⁇ becomes the first side degassing element located on the first extension direction D1 side
• the intermediate degassing element 2 ⁇ becomes the second side degassing element located on the second extension direction D2 side.
• the intermediate degassing element 2 ⁇ is the first side degassing element located on the first extension direction D1 side
• the second end degassing element 2 ⁇ is the second side degassing element located on the second extension direction D2 side.
• the two element connection parts 7A are composed of a first element connection part 7A ⁇ that connects the first end degassing element 2 ⁇ and the intermediate degassing element 2 ⁇ , and a second element connection part 7A ⁇ that connects the intermediate degassing element 2 ⁇ and the second end degassing element 2 ⁇ .
• the first element connection portion 7A ⁇ forms an intermediate communication space S4 that is connected to the hollow portions 22a of the hollow fiber membranes 22 and the hollow portions 23a of the suction pipes 23 of the first end degassing element 2 ⁇ and the hollow portions 22a of the hollow fiber membranes 22 and the hollow portions 23a of the suction pipes 23 of the intermediate degassing element 2 ⁇ .
• the first element connection portion 7A ⁇ also forms an intermediate liquid flow passage S5 that is connected to the hollow portions 21a of the liquid flow pipes 21 of the first end degassing element 2 ⁇ and the hollow portions 21a of the liquid flow pipes 21 of the intermediate degassing element 2 ⁇ .
• the housing 3D accommodates the first end degassing element 2 ⁇ , the intermediate degassing element 2 ⁇ , and the second end degassing element 2 ⁇ so that a space is formed between the first end degassing element 2 ⁇ , the intermediate degassing element 2 ⁇ , and the second end degassing element 2 ⁇ .
• the end baffle 4 blocks the end of the hollow portion 22a of the liquid flow pipe 21 of the first end degassing element 2 ⁇ on the first extension direction D1 side.
• the end baffle 4 is attached only to the first end degassing element 2 ⁇ , and does not block the hollow portion 22a of the liquid flow pipe 21 of the intermediate degassing element 2 ⁇ and the second end degassing element 2 ⁇ .
• no member that blocks the movement of the liquid L in the extension direction D is provided in the hollow portion 21a and each intermediate communication space S4 of the liquid flow pipe 21 of the first end degassing element 2 ⁇ , the intermediate degassing element 2 ⁇ , and the second end degassing element 2 ⁇ .
• the first end communication space forming part 5 is connected to the first fixed part 24 of the first end degassing element 2 ⁇ so as to cover the first element end part 2a of the first end degassing element 2 ⁇ .
• the first end communication space forming part 5 forms a space as the first end communication space S1 that communicates between the hollow parts 22a of the multiple hollow fiber membranes 22 of the first end degassing element 2 ⁇ and the hollow parts 23a of the multiple suction pipes 23 of the first end degassing element 2 ⁇ .
• the partition 6 seals the gap between the second fixing portion 25 of the second end degassing element 2 ⁇ and the housing 3D, thereby dividing the area within the housing 3D into an inner area R1 and an outer area R2.
• the liquid degassing method according to the fifth embodiment is a method for degassing the liquid L by using a degassing module 1D.
• the suction port 3c and intermediate suction port 3e of the degassing module 1D are sucked, and liquid L is supplied to the liquid supply port 3a of the degassing module 1A.
• the liquid L supplied to the hollow portion 21a of each liquid flow pipe 21 is discharged to the outside of the liquid flow pipe 21 from the multiple openings 21d of the liquid flow pipe 21 and comes into contact with the multiple hollow fiber membranes 22.
• the hollow portions 22a of the plurality of hollow fiber membranes 22 are in a depressurized state, so that gas G, such as dissolved gas in the liquid L and air bubbles contained in the liquid L, permeates the plurality of hollow fiber membranes 22.
• the gas G that has permeated the hollow fiber membranes 22 of the second end degassing element 2 ⁇ , the intermediate degassing element 2 ⁇ , and the first end degassing element 2 ⁇ passes through the hollow portions 22a of the hollow fiber membranes 22 of the second end degassing element 2 ⁇ , the intermediate degassing element 2 ⁇ , and the first end degassing element 2 ⁇ , the intermediate communication space S4 formed by the second element connection portion 7A ⁇ , the intermediate communication space S4 formed by the first element connection portion 7A ⁇ , the first end communication space S1, the hollow portions 23a of the suction pipes 23 of the second end degassing element 2 ⁇ , the intermediate degassing element 2 ⁇ , and the first end degassing element 2 ⁇ , and the second end communication space S3, and is discharged from the suction port 3c and the intermediate suction port 3e.
• the housing 3D has an intermediate suction port 3e that is connected to the first element connection portion 7A ⁇ and communicates with the intermediate communication space S4. Therefore, when the internal region R1 is sucked from the suction port 3c and the intermediate suction port 3e, this suction force passes through the hollow portions 23a of the multiple suction pipes 23 of the second end degassing element 2 ⁇ , the intermediate degassing element 2 ⁇ , and the first end degassing element 2 ⁇ , and is transmitted to the intermediate communication space S4 formed by the first element connection portion 7A ⁇ , the intermediate communication space S4 formed by the second element connection portion 7A ⁇ , and the first end communication space S1.
• the hollow portions 22a of the multiple hollow fiber membranes 22 of the first end degassing element 2 ⁇ , the intermediate degassing element 2 ⁇ , and the second end degassing element 2 ⁇ are sucked from both the second element end 2b side of the second end degassing element 2 ⁇ and the first element end 2a side of the first end degassing element 2 ⁇ .
• This allows for high degassing efficiency, and therefore reduces the number of components connected to the degassing element 2 and the housing 3D to suck the hollow portion 22a of the multiple hollow fiber membranes 22.
• degassing element according to the second embodiment Next, a degassing element according to a second embodiment will be described.
• the degassing element according to the second embodiment is basically the same as the degassing element 2 according to the first embodiment, but differs from the degassing element 2 according to the first embodiment in that it further includes an intermediate baffle. Therefore, in the following description, only the differences from the degassing element 2 according to the first embodiment will be described, and the same description as the degassing element 2 according to the first embodiment will be omitted.
• FIG. 18 is a schematic front view of a degassing element according to a second embodiment.
• FIG. 19 is a schematic cross-sectional view taken along line XIX-XIX in FIG. 18.
• FIG. 20 is a schematic cross-sectional view showing a portion of the degassing element shown in FIG. 18.
• the degassing element 2E according to this embodiment comprises a liquid circulation pipe 21, a plurality of hollow fiber membranes 22, a plurality of suction pipes 23, a first fixing portion 24, a second fixing portion 25, and an intermediate baffle 26.
• the intermediate baffle 26 blocks the hollow portion 22a of the liquid flow pipe 21 at the element intermediate portion 2c between the first element end 2a and the second element end 2b.
• the element intermediate portion 2c is, for example, a portion located in the center between the first element end 2a and the second element end 2b.
• the intermediate baffle 26 is fitted into the hollow portion 21a of the liquid flow pipe 21 at the element intermediate portion 2c.
• the intermediate baffle 26 prevents the liquid L from flowing between the first element end 2a and the second element end 2b of the liquid flow pipe 21.
• the liquid L supplied to the hollow portion 21a of the liquid flow pipe 21 from either the first element end 2a or the second element end 2b does not flow to the other side of either the first element end 2a or the second element end 2b unless it goes outside the liquid flow pipe 21 from the multiple openings 21d and returns to the hollow portion 21a of the liquid flow pipe 21 from the multiple openings 21d again.

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• Chemical & Material Sciences (AREA)
• Chemical Kinetics & Catalysis (AREA)
• Engineering & Computer Science (AREA)
• Water Supply & Treatment (AREA)
• Separation Using Semi-Permeable Membranes (AREA)
• Degasification And Air Bubble Elimination (AREA)

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Citations (5)

• 2024
  • 2024-12-25 WO PCT/JP2024/045977 patent/WO2025150434A1/ja active Pending
  • 2024-12-25 JP JP2025543682A patent/JP7782762B2/ja active Active
  • 2024-12-27 TW TW113151125A patent/TW202533866A/zh unknown

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