JP2013119914A - Support structure of cylindrical tube and method of sealing the cylindrical tube - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a support structure of a cylindrical tube and a method of sealing the cylindrical tube, allowing the cylindrical tube to be stably supported inside a vessel.SOLUTION: The support structure 40 of the cylindrical tube supports the cylindrical tube 11 having a primary chamber 21 inside and including both ends sealed, by upper and lower tube plates 13B provided at both the ends of a shell part. A first groove 46A and a second groove 46B are provided in the upper and lower tube plates 13B. The support structure includes: an O-ring holder 41 including a first recess 48A in which a first O-ring 47A in contact with the first groove 46A is loaded, and a second recess 48B in which a second O-ring 47B in contact with the cylindrical tube 11 is loaded; a pressing lid 42 for pressing the O-ring holder 41 in the axial direction of the cylindrical tube 11; and a bolt 43 which is screwed into a slot 49 of the pressing lid 42 and presses the O-ring holder 41 in the axial direction of the cylindrical tube 11.

Description

  The present invention relates to a support structure for a cylindrical tube used for a container including a cylindrical tube such as a separation membrane of a hydrogen separator, for example.

  Industrially, hydrogen is purified by reacting a fossil fuel such as natural gas with water vapor or oxygen, and then separating it with an adsorbent or using a separation membrane.

  The reformed gas of fossil fuel contains hydrocarbons such as carbon monoxide, carbon dioxide, water and methane in addition to hydrogen, and selectively separates hydrogen by a separation membrane capable of selectively separating hydrogen.

  The vessel has a raw material gas supply port to which a reformed gas containing hydrogen is supplied at one end, an off-gas discharge port for discharging the gas from which hydrogen has been removed at the other end, and a separately separated hydrogen It has a structure having a hydrogen discharge port for discharging gas. In addition, the separation membrane in the membrane separation device is provided so as to extend vertically so that a gas containing hydrogen can permeate, and is held by being sandwiched between O-rings on the upper and lower tube plates of the secondary side chamber. .

  In a membrane separation apparatus equipped with a separation membrane in a pressure vessel, the reformed gas containing hydrogen is introduced into the primary side chamber in the separation membrane from the raw material gas supply port side, so that separation occurs as the reformed gas containing hydrogen rises. Hydrogen in the reformed gas is moved to the secondary side chamber under reduced pressure that accommodates the membrane, and purified hydrogen is obtained from the hydrogen outlet.

  When assembling a vessel containing a cylindrical tube with a separation membrane, first place the shell part horizontally and fill the shell part with a plurality of cylindrical tubes, and place the tube plate horizontally on one end of the shell part with the cylindrical tube. The cylindrical tube is connected and inserted into the through hole of the lower tube plate, and one end side of the cylindrical tube is supported by the lower tube plate. Thereafter, the lower end plate is attached to the lower tube sheet. Thereafter, the shell portion, the lower tube plate and the lower end plate are set up vertically, the upper tube plate is vertically connected to the other end of the shell portion, and the cylindrical tube is inserted into the through hole of the upper tube plate. The end side is supported by the upper tube sheet. Thereafter, the upper end plate is attached to the upper tube sheet. Thereby, the vessel containing a plurality of cylindrical tubes is assembled.

  In the conventional method for assembling the vessel, it is difficult to insert the cylindrical tube into the upper tube plate and the lower tube plate. Further, when the cylindrical tube is erected from the horizontal direction to the vertical direction while being supported by the lower tube plate, the separation membrane provided on the cylindrical tube may be damaged.

  Therefore, in order to further improve the workability of assembling the vessel while taking these circumstances into consideration, when assembling the vessel, the upper tube plate and the lower tube plate provided at both ends of the shell portion with the shell portion standing vertically are cylindrical. Methods to support the tube are being considered.

  At that time, as a method of supporting the pipe inserted into the joint member, for example, a metal ring and an O-ring are provided between the pipe and the joint member at the upper end of the joint member, and a nut that covers the upper end of the joint member is provided. A nut that is provided and tightened to the upper end of the joint member presses the O-ring against the tapered portion formed inside the joint member through the metal ring, and the inner peripheral surface side of the O-ring presses the pipe to the joint member. There has been proposed a method of supporting a tube inserted perpendicularly to the tube using an O-ring (see, for example, Patent Document 2).

JP-A-7-124444 JP 2003-294145 A

  However, even if the sealing method described in Patent Document 2 as described above is applied to the cylindrical tube built in the vessel, since the cylindrical tube is a large tube, the cylindrical tube is supported by the tube plate, In order to seal the inside of the vessel, it is necessary to apply a large force to the cylindrical tube. Therefore, it is difficult to stably support and seal the cylindrical tube inside the vessel by hand tightening.

  In view of the above problems, an object of the present invention is to provide a cylindrical tube support structure and a cylindrical tube sealing method capable of stably supporting a cylindrical tube inside a vessel.

  A first invention of the present invention for solving the above-described problem is provided with a cylindrical pipe provided inside a shell portion, forming a fluid flow passage inside, and sealed at both ends, at both ends of the shell portion. In the cylindrical tube support structure provided and supported by a tube plate having a through hole into which the cylindrical tube can be inserted, the tube plate has a first groove portion and the first groove portion around the through hole. A first groove that is in contact with the inner surface of the first groove on the tube plate side is provided on the first groove at both ends of the cylindrical tube. An O-ring holder having a first recess portion loaded with an O-ring and a second recess portion loaded with a second O-ring contacting the cylindrical tube side, and a wall surface of the second groove portion And a presser lid that presses the O-ring holder in the axial direction of the cylindrical tube, and the presser To be screwed into the slots provided, a support structure of a cylindrical tube and having a, a pressing means for pressing in the axial direction of the cylindrical tube through the holding lid the O-ring holder.

  A second invention is a cylindrical tube support structure according to the first invention, wherein an O-ring pressing member is provided in an axial direction of the cylindrical tube between the O-ring holder and the pressing lid. .

  According to a third aspect of the present invention, there is provided a cylindrical tube provided inside the shell portion, forming a fluid flow passage inside, and sealed at both ends, and provided at both ends of the shell portion, and inserting the cylindrical tube In a sealing method of a cylindrical tube supported by a tube plate having a possible through hole, a first groove portion and a second groove portion having a larger diameter than the first groove portion are provided around the through hole of the tube plate. A first O-ring that contacts the inner surface of the first groove on the tube plate side is loaded in the first groove at both ends of the cylindrical tube. An O-ring holder having a recess and a second recess that is loaded with a second O-ring that comes into contact with the cylindrical tube side, and is screwed into a wall surface of the second groove, and the O-ring holder is A pressing lid that presses in the axial direction of the cylindrical tube, and is screwed into a slot provided in the pressing lid, And a pressing means for pressing the ring holder in the axial direction of the cylindrical tube through the pressing lid, and pressing the O-ring holder toward the tube plate by the pressing lid to push the first O-ring. The O-ring holder is pressed against the tube plate by the pressing means through the pressing lid by the pressing means to press-bond the first O-ring to the tube plate, and the second O A sealing method for a cylindrical tube, comprising: pressing a ring toward the cylindrical tube side to pressure-bond the second O-ring against the cylindrical tube side, and supporting and sealing the cylindrical tube with the tube plate. .

  According to a fourth aspect of the invention, there is provided the cylindrical tube sealing method according to the third aspect of the invention, wherein an O-ring pressing member is provided in the axial direction of the cylindrical tube between the O-ring holder and the pressing lid.

  According to the present invention, the cylindrical tube can be stably supported inside the vessel.

FIG. 1 is a cross-sectional view of a main part showing a membrane separation apparatus. FIG. 2 is a partial cross-sectional view of a cylindrical tube. FIG. 3 is a cross-sectional view taken along the line AA of FIG. FIG. 4 is a partial cross-sectional view of a cylindrical tube. 5 is a cross-sectional view taken along the line AA in FIG. FIG. 6 is a schematic view schematically showing a cylindrical tube support structure according to an embodiment of the present invention. FIG. 7 is a view as seen from the AA direction in FIG. FIG. 8 is a diagram simply showing another configuration of the cylindrical tube support structure according to the embodiment of the present invention. FIG. 9 is a diagram simply showing another configuration of the cylindrical tube support structure according to the embodiment of the present invention.

  Hereinafter, the present invention will be described in detail with reference to the drawings. In addition, this invention is not limited by the form (henceforth embodiment) for implementing the following invention. In addition, constituent elements in the following embodiments include those that can be easily assumed by those skilled in the art, those that are substantially the same, and those in a so-called equivalent range. Furthermore, the constituent elements disclosed in the following embodiments can be appropriately combined.

  FIG. 1 is a cross-sectional view of a main part of a membrane separation apparatus to which a cylindrical tube support structure according to this embodiment is applied. As shown in FIG. 1, a membrane separation apparatus 10 to which a cylindrical tube support structure according to this embodiment is applied includes a cylindrical tube 11, a shell portion 12, an upper tube plate 13A, a lower tube plate 13B, an upper end plate 14A, and a lower portion. It has an end plate 14B. The shell portion 12, the upper tube plate 13A, the lower tube plate 13B, the upper end plate 14A, and the lower end plate 14B constitute a pressure vessel (vessel).

  The cylindrical tube 11 is provided inside the shell portion 12. A primary chamber (fluid passage) 21 for allowing fluid to pass through is formed in the cylindrical tube 11. The primary chamber 21 extends vertically from the upper tube plate 13 </ b> A side to the lower tube plate 13 </ b> B side as a fluid flow path inside the cylindrical tube 11. A secondary chamber (fluid chamber) 22 is formed between the outer periphery of the cylindrical tube 11 and the inner periphery of the shell portion 12. The cylindrical tube 11 is formed using, for example, a material such as ceramics and is porous. Further, both ends of the cylindrical tube 11 are supported and sealed by tube plates (upper tube plate 13A and lower tube plate 13B).

  The cylindrical tube 11 includes a hydrogen separation membrane part 23. The hydrogen separation membrane unit 23 separates the fluid into off-gas and hydrogen. In the present embodiment, four hydrogen separation membrane parts 23 are installed in parallel in the shell part 12. The hydrogen separation membrane unit 23 includes various forms and is commercially available. As the hydrogen separation membrane part 23, for example, only one primary chamber (fluid passage) 21 is provided, and a tubular type in which the hydrogen separation membrane part 23 is formed in a cylindrical shape by a membrane, or a primary chamber (fluid passage). The monolith type thing etc. with which 21 was provided and the hydrogen separation membrane part 23 was formed in the column shape are mentioned. In the case where the hydrogen separation membrane unit 23 is a tubular or monolithic type hydrogen separation membrane, the primary chamber (fluid passage) 21 inside the hydrogen separation membrane is connected to the primary side or supply side of the membrane. The outside of the hydrogen separation membrane is called the secondary side or the permeate side of the membrane.

  The case where the hydrogen separation membrane part 23 is a tubular type will be described. 2 is a partial cross-sectional view of the cylindrical tube 11, and FIG. 3 is a cross-sectional view taken along the line AA of FIG. As shown in FIGS. 2 and 3, the tubular hydrogen separation membrane portion 23 </ b> A has a hydrogen separation membrane portion 23 </ b> A formed in a cylindrical shape on the inner wall of the cylindrical tube 11, and has only one primary chamber (fluid passage) 21 inside. It is what you have. As the tubular cylindrical tube 11, for example, an outer diameter of 10 mm and an inner diameter of 7 mm, an outer diameter of 30 mm, and an inner diameter of 22 mm can be used. The length of the tubular cylindrical tube 11 can be determined as appropriate according to the desired membrane performance, and for example, a length of 150 mm to 1 m can be used.

  The case where the hydrogen separation membrane part 23 is a monolith type will be described. 4 is a partial cross-sectional view of the cylindrical tube 11, and FIG. 5 is a cross-sectional view taken along line AA of FIG. As shown in FIGS. 4 and 5, the monolithic hydrogen separation membrane part 23B is provided with a plurality of primary chambers (fluid passages) 21 extending vertically to allow fluid to pass through the cylindrical hydrogen separation membrane part 23B. .

  As the monolithic hydrogen separation membrane portion 23B, for example, a hydrogen separation membrane portion having 30 holes with a diameter of 3 mm provided for a cylindrical hydrogen separation membrane with a diameter of 30 mm, a hydrogen separation membrane with a diameter of 150 to 200 mm For example, a hydrogen separation membrane part having 200 holes with a diameter of 2 mm can be used. The length of the monolith-type cylindrical tube 11 can be appropriately determined according to the desired film performance, and for example, a length of 150 mm to 1 m can be used.

  As the material of the hydrogen separation membrane constituting the hydrogen separation membrane portion 23, it is possible to use a microporous porous membrane which is an inorganic material whose nano-order or smaller pore diameter is precisely controlled, or a separation membrane obtained by plating palladium on the ceramic surface. it can. The microporous membrane exhibits a molecular sieving effect that allows small molecular gases to pass through and excludes large molecular gases, and shows a behavior of activated diffusion whose permeability coefficient increases with increasing temperature.

  The form, size and material of the hydrogen separation membrane portion 23 can be appropriately selected according to the purpose of use. Further, in the present embodiment, the four hydrogen separation membrane parts 23 are provided in the shell part 12, but the membrane separation apparatus 10 is not limited to this, and a plurality of hydrogen hydrogens are contained in the shell part 12. A plurality of separation membrane portions 23 may be provided in parallel.

  Such hydrogen separation membrane portions 23A and 23B are preferably installed so that the direction of the flow path is parallel to the vertical direction.

  The cylindrical tube 11 has a fluid inlet at the lower end and an outlet at the upper end. Then, a fluid is supplied from an inlet on the lower side in the vertical direction of the hydrogen separation membrane unit 23 and discharged from an outlet on the upper side in the vertical direction. At that time, hydrogen in the fluid is extracted from the side surface of the hydrogen separation membrane portion 23 to the permeate side. Thereby, off-gas is collect | recovered from the hydrogen separation membrane part 23 exit side.

  In the present embodiment, the hydrogen separation membrane portion 23 separates hydrogen contained in the fluid and improves the hydrogen permeation performance, so that the secondary chamber (fluid chamber) 22 is placed inside or outside the shell portion 12. You may make it provide one or more heating means for heating the inside of the decompression device for depressurizing, the secondary chamber (fluid chamber) 22, and the like.

  Examples of the pressure reducing device include a vacuum pump. It is preferable to reduce the pressure of the shell portion 12 so as to be, for example, about 10 to 500 torr. The hydrogen permeation performance can be improved by the differential pressure between the primary chamber 21 on the supply side of the hydrogen separation membrane section 23 and the secondary chamber 22 on the permeate side.

  The shell portion 12 has an upper flange 24A and a lower flange 24B at both ends thereof. An upper tube plate 13A is provided above the upper flange 24A, and a lower tube plate 13B is provided below the lower flange 24B.

  The upper end plate 14A is provided on the side opposite to the shell 12 side of the upper tube plate 13A. The lower end plate 14B is provided on the side opposite to the shell 12 side. The upper end plate 14A and the upper end plate 14B have an upper flange 25A and a lower flange 25B at both ends thereof.

  An upper chamber 27 is formed between the upper end plate 14A and the upper tube plate 13A, and a lower chamber 28 is formed between the lower end plate 14B and the lower tube plate 13B.

  The upper tube plate 13A and the lower tube plate 13B are provided at both ends of the shell portion 12 and have through holes 30 into which the cylindrical tube 11 can be inserted.

  The upper tube plate 13A is sandwiched between the upper flange 24A of the shell portion 12 and the upper flange 25A of the upper end plate 14A, and is fastened with three bolts using bolts 29. The lower tube plate 13B is sandwiched between the lower flange 24B of the shell portion 12 and the lower flange 25B of the lower end plate 14B, and is fastened with three bolts using bolts 29. Thereby, the membrane separation apparatus 10 is assembled.

  In the membrane separator 10, the reformed gas 31, which is a mixture of hydrogen, carbon monoxide, carbon dioxide, methane and other hydrocarbons and water, is introduced into the lower chamber 28. The hydrogen concentration of the reformed gas 31 is, for example, a reformed gas having a hydrogen concentration of about 50 vol%. Thereafter, the reformed gas 31 is supplied to the primary chamber 21 in the cylindrical hydrogen separation membrane portion 23 and flows from the lower side to the upper side of the shell portion 12. At that time, as the reformed gas 31 rises in the primary chamber 21, the hydrogen in the reformed gas 31 moves to the secondary chamber 22 in the secondary chamber 22 under reduced pressure that houses the hydrogen separation membrane portion 23. Thus, the dehydrogenated reformed gas 32 is discharged from the upper part of the primary side chamber 21 into the upper chamber 27.

  Next, the cylindrical tube support structure according to this embodiment provided in the membrane separation apparatus will be described. FIG. 6 is a schematic view simply showing the cylindrical tube support structure according to the present embodiment, and is an enlarged view of a Z portion in FIG. 1. FIG. 7 is a view as seen from the AA direction in FIG.

  As shown in FIGS. 6 and 7, the cylindrical tube support structure 40 according to the present embodiment supports the cylindrical tube 11 with the upper tube plate 13 </ b> A and the lower tube plate 13 </ b> B. A lid 42, a bolt (pressing means) 43, and an O-ring pressing member 44 are provided.

  The upper tube plate 13A and the lower tube plate 13B are provided with a two-step groove portion 46 including a first groove portion 46A and a second groove portion 46B having a larger diameter than the first groove portion 46A around the through hole 30. It has been.

  In the O-ring holder 41, first O-rings 47 </ b> A that contact the inner surfaces of the first groove portions 46 </ b> A on the upper tube plate 13 </ b> A and lower tube plate 13 </ b> B side are loaded in the first groove portions 46 </ b> A at both ends of the cylindrical tube 11. It has the 1st hollow part 48A and the 2nd hollow part 48B with which the 2nd O-ring 47B which contacts the cylindrical tube 11 side is loaded.

  The O-ring holder 41 is formed in an annular shape and is inserted into the first groove 46A. The first recess 48A is loaded with the first O-ring 47A, and the lower tube plate 13B between the cylindrical tube 11 and the O-ring holder 41 is sealed in the planar direction.

  The second recess 48B is provided on the lower inner peripheral side of the O-ring holder 41 and has a triangular cross section. A second O-ring 47B is incorporated in the second recess 48B.

  The presser lid 42 is screwed into the wall surface of the second groove 48 </ b> B and presses the O-ring holder 41 in the axial direction of the cylindrical tube 11. The pressing lid 42 is formed in an annular shape.

  The bolt 43 is screwed into a slot 49 provided in the pressing lid 42 and presses the O-ring holder 41 and the O-ring pressing member 44 in the axial direction of the cylindrical tube 11 through the pressing lid 42. The bolt 43 may be anything that can be screwed into the slot 49, and for example, a bolt with a lock nut is preferably used. The holding lid 42 is provided with a plurality of slots 49 in the circumferential direction. By screwing the bolt 43 into each slot 49 of the lower tube plate 13B, the O-ring holder 41 and the O-ring pressing member 44 can be pressed against the lower tube plate 13B.

  The O-ring pressing member 44 is provided in the axial direction of the cylindrical tube 11 between the O-ring holder 41 and the pressing lid 42. The O-ring pressing member 44 is provided so as to contact the lower surface of the O-ring holder 41. Therefore, the second O-ring 47B is pressed by the O-ring pressing member 44 at the second recess 48B. As a result, the second O-ring 47B seals between the cylindrical tube 11 and the O-ring holder 41 and seals the cylindrical tube 11 in the axial direction.

  After the cylindrical tube 11 is inserted into the through hole 30 of the lower tube plate 13B, the first O-ring 47A is inserted into the first recess 48A and the second O-ring 47B is inserted into the second recess 48B. The O-ring holder 41 is placed in the first groove 46A. Thereafter, the pressing lid 42 is screwed into the second groove 46B while the O-ring pressing member 44 is sandwiched between the O-ring holder 41 and the pressing lid 42. Thereafter, by rotating the pressing lid 42 in the circumferential direction, the O-ring holder 41 and the O-ring pressing member 44 are pressed in the axial direction of the cylindrical tube 11, and the first O-ring 47A is crimped to the lower tube plate 13B. Further, the second O-ring 47B is crimped to the outer periphery of the cylindrical tube 11.

  Thereafter, by inserting a bolt 43 into the slot 49 of the holding lid 42 and screwing it in the axial direction of the cylindrical tube 11, the O-ring holder 41 and the O-ring pressing member 44 press the lower tube plate 13B, and the first O-ring. 47A pressure-bonds to the lower tube plate 13B to further seal the space between the secondary chamber (fluid chamber) 22 and the outside in a fluid tight manner. Further, the second O-ring 47B is further pressure-bonded to the outer periphery of the cylindrical tube 11 so as to further fluid-tightly seal between the secondary chamber (fluid chamber) 22 of the cylindrical tube 11 and the outside.

  At this time, a gap A is formed in the planar direction of the lower tube plate 13B between the first groove 46A of the lower tube plate 13B and the O-ring holder 41. A gap B is formed between the inner peripheral surface of the O-ring holder 41 and the outer peripheral surface of the cylindrical tube 11. Further, a gap C is formed in the planar direction between the O-ring pressing member 44 and the pressing lid 42.

  That is, by screwing the holding lid 42 into the lower tube plate 13B in the axial direction of the cylindrical tube 11, the O-ring holder 41 and the O-ring pressing member 44 press the lower tube plate 13B in the axial direction of the cylindrical tube 11, and the first The O-ring 47A is crimped to the lower tube plate 13B, and the second O-ring 47B is crimped to the outer periphery of the cylindrical tube 11. As a result, the space between the secondary chamber (fluid chamber) 22 and the outside is sealed in a fluid-tight manner. Further, by screwing the bolt 43 into the groove 49 of the holding lid 42 in the axial direction of the cylindrical tube 11, the O-ring holder 41 and the O-ring holding member 44 press the lower tube plate 13B, and the first O-ring. 47A is pressure-bonded to the lower tube plate 13B to further fluidly seal between the secondary chamber (fluid chamber) 22 and the outside, and the second O-ring 47B is further pressure-bonded to the outer periphery of the cylindrical tube 11 to form a cylinder. The space between the secondary chamber (fluid chamber) 22 of the tube 11 and the outside is further fluid-tightly sealed.

  Further, the upper tube plate 13A is operated in the same manner. That is, after the cylindrical tube 11 is inserted into the through hole 30 of the upper tube plate 13A, the first O-ring 47A is inserted into the first recess 48A and the second O-ring 47B is inserted into the second recess 48B. The inserted O-ring holder 41 is put into the first groove 46A. Thereafter, while holding the O-ring pressing member 44 between the O-ring holder 41 and the pressing lid 42, the pressing lid 42 is turned in the circumferential direction, and the pressing lid 42 is screwed into the second groove portion 46B. Screw into the plate 13A in the axial direction of the cylindrical tube 11. As a result, the O-ring holder 41 and the O-ring pressing member 44 press the upper tube plate 13A in the axial direction of the cylindrical tube 11, and the first O-ring 47A is pressure-bonded to the upper tube plate 13A and the second O-ring. 47B is crimped to the outer periphery of the cylindrical tube 11. As a result, the space between the secondary chamber (fluid chamber) 22 and the outside is sealed in a fluid-tight manner. Thereafter, the O-ring holder 41 and the O-ring holding member 44 press the upper tube plate 13A by screwing the bolt 43 into the groove 49 of the holding lid 42 in the axial direction, and the first O-ring 47A The second O-ring 47B is further pressure-bonded to the outer periphery of the cylindrical tube 11 while being tightly sealed between the secondary chamber (fluid chamber) 22 and the outside by being pressure-bonded to the upper tube plate 13A. The secondary chamber (fluid chamber) 22 and the outside are further fluid-tightly sealed.

  Therefore, according to the cylindrical tube support structure 40 according to the present embodiment, the O-ring holder 41 and the O-ring holding member 44 are pressed toward the upper tube plate 13A and the lower tube plate 13B by the holding lid 42, so that the first O The ring 47A is crimped to the upper tube plate 13A and the lower tube plate 13B. Then, the O-ring holder 41 and the O-ring pressing member 44 are pressed by the bolt 43 through the pressing lid 42 toward the upper tube plate 13A and the lower tube plate 13B, and the first O-ring 47A is connected to the upper tube plate 13A and the lower tube. While being crimped to the plate 13B, the second O-ring 47B is pressed to the cylindrical tube 11 side to crimp the second O-ring 47B to the cylindrical tube 11 side. Thereby, the cylindrical tube 11 can be supported by the upper tube plate 13A and the lower tube plate 13B.

  Further, the second O-ring 47B is incorporated into a second recess 48B having a triangular cross section provided on the inner periphery of the O-ring holder 41, and is pressed by the O-ring holding member 44. Sealing with the outer periphery. Therefore, with respect to the roundness and diameter tolerance of each cylindrical tube 11, the O-ring holder 41 and the O-ring holder 41 through the holding lid 42 by the bolt 43 according to the roundness and diameter tolerance of each cylindrical tube 11. The pressure of the O-ring pressing member 44 can be adjusted to cope with the elasticity of the second O-ring 47B. For this reason, the cylindrical tube 11 can be stably sealed in the axial direction without being affected by the roundness and diameter tolerance of the cylindrical tube 11.

  Further, with respect to the tolerance in the length direction of each cylindrical tube 11, the pressing of the O-ring holder 41 and the O-ring pressing member 44 is adjusted by the bolt 43 via the pressing lid 42, and the first O-ring 47 </ b> A is adjusted. Since it is possible to cope with elasticity, the upper tube plate 13A and the lower tube plate 13B can be stably sealed in the plane direction without being affected by the tolerance of the roundness of the cylindrical tube 11.

  Therefore, the cylindrical tube 11 is supported by the upper tube plate 13A and the lower tube plate 13B without being affected by the straightness, roundness, diameter tolerance, etc. of the cylindrical tube 11 installed in the shell portion 12, and Since the occurrence of defective sealing can be suppressed, the sealing performance can be improved.

  Thus, according to the cylindrical tube support structure 40 according to the present embodiment, the cylindrical tube 11 can be stably supported inside the vessel. This makes it possible to reliably and stably seal the space between the secondary chamber (fluid chamber) 22 of the cylindrical tube 11 and the outside.

  Further, since the O-ring holder 41, the pressing lid 42 and the O-ring pressing member 44 can be attached to and disassembled from the upper tube plate 13A and the lower tube plate 13B as a set, assembly and disassembly operations can be performed. It can be done easily.

  In addition, since the tolerance of the roundness of the cylindrical tube 11 can be dealt with by the elasticity of the second O-ring 47B, the tolerance of the roundness of the cylindrical tube 11 is not affected by the tolerance of the roundness of the cylindrical tube 11 and is stable. Axial sealing can be performed.

  In the present embodiment, the holding lid 42 is configured so that the inner diameter of the portion into which the bolt 43 is inserted substantially coincides with the outer periphery of the cylindrical tube 11, but the present embodiment is not limited to this. As shown in FIG. 8, the lower tube plate 13 </ b> B may be provided with a presser lid 51 in which the inner diameter of the portion where the bolt 43 is inserted extends inward from the outer periphery of the cylindrical tube 11. By using the pressing lid 51 for the lower tube plate 13B, the cylindrical tube 11 can be more stably held by the pressing lid 51.

  Further, in this embodiment, the O-ring holder 41 and the O-ring pressing member 44 are provided between the inner periphery of the presser lid 42 and the upper tube plate 13A and the lower tube plate 13B. The present invention is not limited to this, and as shown in FIG. 9, only the O-ring holder 41 may be provided between the inner periphery of the pressing lid 42 and the upper tube plate 13A and the lower tube plate 13B.

  Further, in the present embodiment, the case where the reformed gas is used as the fluid to be separated has been described. However, the present embodiment is not limited to this, and the cylindrical tube support structure 40 according to the present embodiment includes: It can be applied as a method of supporting and sealing a cylindrical tube used for a container having a cylindrical tube that requires replacement.

DESCRIPTION OF SYMBOLS 10 Membrane separator 11 Cylindrical tube 12 Shell part 13A Upper tube plate 13B Lower tube plate 14A Upper end plate 14B Lower end plate 21 Primary chamber (fluid passage)
22 Secondary chamber (fluid chamber)
23, 23A, 23B Hydrogen separation membrane 24A, 25A Upper flange 24B, 25B Lower flange 27 Upper chamber
28 Lower chamber 29 Bolt 30 Through-hole 31 Reformed gas 32 Dehydrogenated reformed gas 40 Cylindrical tube support structure 41 O-ring holder 42, 51 Holding lid 43 Bolt (pressing means)
44 O-ring holding member 46 Groove 46A First groove 46B Second groove 47A First O-ring 47B Second O-ring 48A First depression 48B Second depression 49 Slot A, B, C Gap

Claims (4)

A tube plate provided inside the shell portion, forming a fluid flow passage inside, and sealed cylindrical tubes at both ends, and having through holes provided at both ends of the shell portion into which the cylindrical tubes can be inserted In the support structure of the cylindrical tube supported by
The tube plate is provided with a two-stage groove portion including a first groove portion and a second groove portion having a larger diameter than the first groove portion around the through hole,
A first recess portion in which a first O-ring that contacts the inner surface of the first groove portion on the tube plate side is loaded into the first groove portion at both ends of the cylindrical tube, and the cylindrical tube side contacts with the first recess portion. An O-ring holder having a second recess portion into which a second O-ring is loaded;
A pressing lid that is screwed into the wall surface of the second groove and presses the O-ring holder in the axial direction of the cylindrical tube;
A pressing means screwed into a slot provided in the pressing lid, and pressing the O-ring holder in the axial direction of the cylindrical tube via the pressing lid;
A cylindrical tube support structure characterized by comprising: In claim 1,
An O-ring pressing member is provided in the axial direction of the cylindrical tube between the O-ring holder and the pressing lid. Cylindrical tubes provided inside the shell portion, forming a fluid flow passage inside, and sealed at both ends, are provided at both ends of the shell portion, and have through holes into which the cylindrical tubes can be inserted. In the sealing method of the cylindrical tube supported by the tube plate,
Around the through-hole of the tube plate, a two-stage groove portion comprising a first groove portion and a second groove portion having a larger diameter than the first groove portion is provided,
The first groove portion at both ends of the cylindrical tube is in contact with the first hollow portion in which the first O-ring contacting the inner surface of the first groove portion on the tube plate side is loaded and the cylindrical tube side. An O-ring holder having a second recess loaded with a second O-ring;
A pressing lid that is screwed into the wall surface of the second groove and presses the O-ring holder in the axial direction of the cylindrical tube;
A pressing means screwed into a slot provided in the pressing lid, and pressing the O-ring holder in the axial direction of the cylindrical tube via the pressing lid;
Is provided,
The O-ring holder is pressed against the tube plate side by the pressing lid, and the first O-ring is crimped to the tube plate,
The pressing means presses the O-ring holder to the tube plate side through the holding lid to press-bond the first O-ring to the tube plate, and the second O-ring to the cylindrical tube side. Press to crimp the second O-ring to the cylindrical tube side,
A cylindrical tube sealing method, wherein the cylindrical tube is supported by the tube plate and sealed. In claim 3,
A sealing method for a cylindrical tube, wherein an O-ring pressing member is provided in an axial direction of the cylindrical tube between the O-ring holder and the pressing lid.

Images