JP2020116512A - Adsorption cylinder - Google Patents

Abstract

To provide an adsorption cylinder comprising an internal welded structure of a cylinder body which is configured so that defects such as breaking of a weld bead are not caused due to inflow and outflow of gas into and from the cylinder accompanying operation of a PSA device and a TSA device, and yet can be easily and inexpensively fabricated.SOLUTION: A circular perforated plate 21 with gas circulation characteristics is supported inside a lower circular cylinder member 15 by a support member 20 provided on an inner peripheral surface of the lower circular cylinder member, and a toric pressing plate 23 is arranged on an upper surface of a circular metal mesh 22 laid on the perforated plate, which allows the perforated plate, the metal mesh and the pressing plate to be piled together vertically and be fixed to one another. An annular clearance part 25 in a radial direction is provided between respective peripheral edges of the perforated plate, the metal mesh and the pressing plate and the inner peripheral surface of the lower circular cylinder member, which is welded so that the annular clearance part is buried by a weld bead 26.SELECTED DRAWING: Figure 3

Description

The present invention relates to the internal structure of an adsorption cylinder used in a pressure swing adsorption method (PSA method), a temperature swing adsorption method (TSA method), or the like, which uses an adsorbent that selectively separates a target gas in a mixed gas.

The pressure swing adsorption method, the so-called PSA method, aims at adsorbing a specific component in the mixed gas to the adsorbent or adsorbing a gas component other than the specific component to the adsorbent by setting a pressure inside the adsorption column. The gas component to be taken out is taken out as a product gas. To execute the PSA method, a PSA device including a plurality of adsorption cylinders is generally used. The adsorption cylinder is equipped with a lattice plate whose upper and lower ends are vertically narrowed by a mirror plate and supported by legs below the inside, and is adsorbed on a wire mesh (screen) laid on the lattice plate. It is filled with agent. For this reason, as the internal structure of the cylindrical body, a welded structure capable of obtaining a sufficient supporting strength with respect to the weight of the adsorbent is adopted (for example, refer to Patent Documents 1 and 2). Further, there is also proposed a suction cylinder that can be stably installed vertically on the floor by connecting the upper end of the cylindrical portion (skirt) provided on the upper surface of the base plate to the lower end of the lower end plate (for example, Patent Document 1). See 3.).

JP-A-8-99012 JP-A-8-103621 JP, 2008-662, A

In recent years, from the viewpoints of ease of handling and storability, there is an increasing need for downsizing PSA devices and TSA devices, and improvements in the structure of the adsorption cylinder have been tried. Therefore, a structure was considered in which the height of the adsorption cylinder was kept low by filling the lower end plate, which was a void (dead space) that could not be filled with the conventional structure, with the adsorption cylinder. There is. However, in order to enhance the filling property of the adsorbent in the lower end plate, it is desirable to provide each member such as the lattice plate and the screen at the lowest possible position, but to obtain the strength to withstand the pressure received from the sudden inflow and outflow of gas. Have problems in production related to the arrangement of these members and the welding method, and the reality is that they have not been embodied yet.

In view of this, the present invention is a method of welding inside a tubular body that can be easily and inexpensively manufactured without causing problems such as cracking of a welding bead when gas enters and leaves the cylinder due to operation of a PSA device or a TSA device. An object is to provide an adsorption cylinder having a structure.

In order to achieve the above object, the first structure of the adsorption cylinder of the present invention is an adsorption cylinder in which an adsorbent is filled in the inside of the cylinder, wherein the cylinder has end plates at the upper and lower ends and a lower end plate. The upper end peripheral portion of the cylindrical member provided on the upper surface of the base plate is welded to the peripheral portion of the formed lower end opening, and a circular perforated plate having gas flowability is provided on the inner peripheral surface of the cylindrical member. While being supported inside the cylindrical member by a supporting member, an annular holding plate is arranged on the upper surface of a circular wire net laid on the eye plate, whereby the eye plate, the wire net, and the holding plate are Are stacked one above the other so that they can be fixed to each other, and a radial annular gap is provided between the peripheral edges of the perforated plate, the wire mesh, and the holding plate, and the inner peripheral surface of the cylindrical member. It is characterized in that the annular gap is welded so as to be filled with a welding bead.

Further, the second to fourth structures of the adsorption cylinder of the present invention are the adsorption cylinder in which an adsorbent is filled inside the cylindrical body, wherein the cylindrical body has upper and lower end plates, respectively, and is formed on the lower end plate. The upper end peripheral portion of the cylindrical member provided on the upper surface of the base plate is welded to the peripheral portion of the lower end opening, and a circular perforated plate having gas flowability is provided on the inner peripheral surface of the cylindrical member. While being supported inside the cylindrical member by a member, an annular holding plate is arranged on the upper surface of a circular wire net laid on the perforated plate so that the perforated plate, the wire net, and the holding plate are moved up and down. And a structure in which they can be fixed to each other, and a radial annular gap is provided between the peripheral edge of the perforated plate and the inner peripheral surface of the cylindrical member, and the mutual diameter of the perforated plate and the holding plate. An annular stepped portion having a peripheral surface of the pressing plate as a vertical peripheral surface is provided by making different, and the annular gap portion and the annular stepped portion are respectively welded so as to be filled with welding beads. There is.

Further, a fifth structure of the adsorption cylinder of the present invention is the adsorption cylinder in which an adsorbent is filled in the inside of the cylindrical body, wherein the cylindrical body has end plates at upper and lower ends, respectively, and a lower end opening formed in the lower end plate. The upper peripheral edge of the cylindrical member provided on the upper surface of the base plate is welded to the peripheral edge of the base plate, and a circular perforated plate having gas flowability is arranged on the upper peripheral edge of the cylindrical member. By disposing an annular holding plate on the upper surface of a circular wire net laid on a plate, the eye plate, the wire net, and the holding plate are stacked vertically to be fixed to each other, and the eye plate and An annular stepped portion having vertical peripheral surfaces of the perforations and the pressing plate is provided by making the diameters of the pressing plate different from each other, and the annular stepped portion is filled with a welding bead. It is characterized by being welded together.

In addition, in the sixth to eighth structures of the suction cylinder of the present invention, the wire mesh and the pressing plate are fixed to each other in the vertical direction by penetrating the wire mesh and the pressing plate instead of welding the annular stepped portion. It is characterized by being made by a plurality of bolts.

According to the present invention, a cylindrical member is provided in a lower end opening formed in a lower end plate, and a perforated plate is arranged inside the cylindrical member or at an upper end peripheral portion, and an upper surface of a wire net laid on the perforated plate. Since the pressing plate is placed on top of each other and these can be stacked vertically and fixed to each other, it is possible to maximize the filling of the adsorbent into the lower end plate and keep the height of the adsorption cylinder low. Therefore, it is possible to meet the needs for product miniaturization. Moreover, it is possible to provide an annular gap portion or an annular step portion that is a joint portion suitable for welding a cylindrical structure, based on the difference in diameter among the cylindrical member, the perforation, and the pressing plate. As a result, it is possible to obtain the internal structure of the cylindrical body that can be easily and inexpensively manufactured while ensuring the strength of the welded portion required for the operation of the PSA device or the TSA device. The manufacturability and reliability of the device can be improved.

It is a sectional front view of the adsorption cylinder showing the example of the 1st form of the present invention. FIG. 2 is a sectional view taken along line II-II of FIG. 1. FIG. 4 is an enlarged cross-sectional view of the main part of the suction cylinder in the same manner. It is a principal part expanded sectional view of the adsorption|suction cylinder which shows the 2nd example of this invention. It is a principal part expanded sectional view of the adsorption|suction cylinder which shows the 3rd example of this invention. It is a principal part expanded sectional view of the adsorption|suction cylinder which shows the example of 4th Embodiment of this invention. It is a principal part expanded sectional view of the adsorption|suction cylinder which shows the 5th example of this invention. It is a principal part expanded sectional view of the adsorption|suction cylinder which shows the 6th example of this invention. It is a principal part expanded sectional view of the adsorption|suction cylinder which shows the 7th example of this invention. It is a principal part expanded sectional view of the adsorption|suction cylinder which shows the 8th example of this invention. It is a principal part expanded sectional view of the adsorption|suction cylinder which shows the 9th example of this invention.

1 to 3 show a suction cylinder in a first embodiment of the present invention. As shown in FIG. 1, the adsorption cylinder 11 has upper and lower ends of a vertical cylindrical cylinder 13 having an adsorbent 12 filled therein narrowed down by an upper mirror plate 13a and a lower mirror plate 13b, respectively. The lower end peripheral portion 14a of the upper cylindrical member (upper skirt) 14 is in the opening portion at the upper end (center), and the upper end peripheral portion 15a of the lower cylindrical member (lower skirt) 15 is in the opening portion at the lower end (center) of the lower end plate 13b. Is a metal cylindrical structure that is internally fitted and welded at the joints of the respective members.

The upper cylindrical member 14 has a flange portion 14b on the outer peripheral surface of the upper end thereof, and the flange portion 14b is provided with a circular closing plate 16 that closes the opening portion by screwing with a bolt/nut. ing. Further, a nozzle 17 for introducing gas into or discharging gas from the inside of the cylindrical body 13 is connected to the gas flow hole 16 a provided in the center of the closing plate 16.

The lower cylindrical member 15 is provided on the upper surface of the base plate 18 for stabilizing the suction cylinder main body at the time of installation, and the nozzle 19 having the bent portion 19a whose upper end is bent upward is inserted into the insertion hole 15b provided in the lower peripheral surface. The gas is introduced or discharged into the inside of the cylindrical body 13 from the tip end opening 19b of the nozzle 19. In addition, a plurality of block-shaped support members 20 projecting toward the inner peripheral side are provided on the upper inner peripheral surface of the lower cylindrical member 15, and on the support members 20, from the lower side, the plate 21 and the wire mesh. The (screen) 22 and the pressing plate 23 are vertically stacked, and in a state where they are temporarily assembled, they can be integrally fixed to each other by the butt all-round welding described later. Further, in this fixed state, the upper surface of the pressing plate 23 is at substantially the same height position as the upper end peripheral portion 15a of the lower cylindrical member 15, that is, at substantially the same height position as the lower end opening of the lower end plate 13b. It is arranged. Here, regarding the relationship between the plate 21 and the nozzle 19, a constant gap is provided in the vertical direction between the lower surface of the plate 21 and the tip opening 19b of the nozzle 19.

The perforation 21 is a metal disc having an outer diameter smaller than the inner diameter of the lower cylindrical member 15 and provided with a large number of through holes 21a having a diameter of, for example, about 10 mm, and supports the weight of the adsorbent 12 to be filled. Meanwhile, the target gas is circulated through these through holes 21a. The wire net 22 prevents the adsorbent 12 from falling due to its own weight or prevents the adsorbent 12 from being jetted together with the gas. The wire net 22 is formed in a circular shape having substantially the same diameter as the perforated plate 21, and depending on the size of the adsorbent 12, The mesh size is appropriately selected and used. A plurality of meshes having different mesh sizes can be stacked and used as the wire net 22.

The holding plate 23 is arranged on the upper surface of the wire net 22 laid on the perforated plate 21 to prevent the wire net 22 from being lifted up due to the flow of gas, and has an outer diameter that is substantially the same as the perforated plate 21. Plate member. As shown in FIG. 2, the pressing plate 23 is formed by separating the seams (both end surfaces) of the substantially C-shaped divided bodies 23a, which are equally divided into three, with respect to the circumference by 3 in the circumferential direction. Gap portions 24 are provided at certain locations, and are arranged so as to have an annular shape as a whole on the upper surface of the wire mesh 22.

Here, in a state where the perforated plate 21, the wire net 22 and the holding plate 23 are stacked and temporarily assembled inside the lower cylindrical member 15, as shown in FIG. A radial annular gap portion 25 is provided between each peripheral edge and the inner peripheral surface of the upper end portion of the lower cylindrical member 15. The annular gap portion 25 is filled with a welding bead 26 to perform butt full circumference welding. .. At this time, the gap size of the annular gap portion 25 is set to, for example, 10 mm, and becomes the root gap R in the butt all-round welding. The welding beads 26 are formed by multi-layer welding in which the welding torch is moved a plurality of times along the annular gap 25, for example, four times, and the welding operation is repeated. As a result, in the annular gap 25, the perforated plate 21, the wire netting 22, and the pressing plate 23 are integrally welded by so-called complete penetration welding, in which they are melted over the entire plate thickness of their peripheral portions.

As described above, according to the first structure of the suction cylinder of the present invention, the lower cylindrical member 15 is provided in the lower end opening formed in the lower end plate 13b, and the perforated plate 21 is provided inside the lower cylindrical member 15. Since the pressing plate 23 is arranged on the upper surface of the wire net 22 laid on the perforated plate 21 and these can be stacked vertically and fixed to each other, the adsorbent 12 in the lower end plate 13b can be fixed. It is possible to maximize the filling and suppress the height dimension of the adsorption cylinder 11 to a low level, and it is possible to meet the needs for product compactification. In addition, it is possible to provide the annular gap portion 25, which is a joint portion suitable for welding a cylindrical structure, based on the difference in diameter among the lower cylindrical member 15, the eyelet 21, and the holding plate 23. With this, it is possible to obtain the internal structure of the cylindrical body 13 that can be easily and inexpensively manufactured while ensuring the strength of the welded portion required for the operation of the PSA device or the TSA device. It is possible to improve the manufacturability and reliability of the TSA device.

In particular, since the circular perforated plate 21, the wire mesh 22, and the pressing plate 23, which are easy to handle, can be temporarily assembled by a simple operation of merely stacking them in the lower cylindrical member 15, the positioning of these members and the mutual operation of the members can be performed. Since no special jig is required for welding so as not to shift the stack, the manufacturing cost can be reduced, and further, the target position of the welding torch with respect to the annular gap portion 25 can be easily determined at the time of welding work. Since the posture can be maintained well, the bead shape and the penetration shape are stable and the structure has high welding quality.

4 to 11 are enlarged cross-sectional views of essential parts respectively showing second to ninth embodiments of the present invention, in which the same components as those of the first embodiment are designated by the same reference numerals, and detailed description thereof will be omitted. Omit it.

In the second example of the form shown in FIG. 4, the upper surface of the plate 21 is arranged at substantially the same height as the upper end peripheral portion 15a of the lower cylindrical member 15 in comparison with the example of the first form, and An annular gap 25 in the radial direction is provided between the peripheral edge and the inner peripheral surface of the upper end of the lower cylindrical member 15. Further, by making the diameters of the presser plate 23 and the wire net 22 smaller than the diameter of the perforated plate 21, the annular step portion having the outer peripheral surface of the presser plate 23 as the vertical peripheral surface on the upper surface of the peripheral edge portion of the perforated plate 21. 27 are provided. Then, the annular gap portion 25 is welded so as to be filled with the welding bead 26 by the butt all-round welding, and the annular step portion 27 is welded so as to be filled with the weld bead 28 by the fillet all-round welding.

In the third embodiment shown in FIG. 5, the inner diameter of the lower end plate 13b is different from that of the second embodiment by making the diameters of the holding plate 23 and the wire net 22 different from the diameter of the plate 21. On the surface, an annular step portion 27 having the outer peripheral surface of the pressing plate 23 as a vertical peripheral surface is provided. In the fourth embodiment shown in FIG. 6, the wire mesh 22 is sandwiched between a pair of upper and lower holding plates 23, 23 in comparison with the third embodiment. In each of the third and fourth embodiments, the annular step portion 27 is welded by filling the entire circumference of the fillet with the welding bead 28. As described above, according to the second to fourth structures of the adsorption cylinder of the present invention, it is possible to widely accommodate various structures of the adsorption cylinder 11 while maximizing the filling of the adsorbent 12 into the lower end plate 13b. be able to.

In the fifth embodiment shown in FIG. 7, the diameter of the perforated plate 21 is formed larger than the inner diameter of the lower cylindrical member 15, so that the perforated plate 21 contacts the plate end of the upper end peripheral portion 15 a of the lower cylindrical member 15. Are arranged. In addition to this, by making the diameter of each of the holding plate 23 and the wire net 22 smaller than the diameter of the eye plate 21, the peripheral surface of the eye plate 21 can be made smaller at the plate end of the upper end peripheral portion 15a of the lower cylindrical member 15. The annular step portion 27 having a vertical peripheral surface is provided on the upper surface of the peripheral edge portion of the plate 21 with the annular step portion 27 having an outer peripheral surface of the pressing plate 23 as a vertical peripheral surface. The stepped annular step portion 27 is welded so as to be filled with the weld bead 28 by the fillet entire circumference welding. As described above, according to the fifth structure of the suction cylinder of the present invention, it is not necessary to provide the support member 20 inside the lower cylindrical member 15, so that the number of members can be reduced.

The sixth to eighth form examples shown in FIGS. 8 to 10 are modified examples corresponding to the above second to fourth form examples. Instead of welding the annular step 27, the wire net 22 and the press plate 23 are fixed to each other by a plurality of bolts 29 that vertically penetrate the wire net 22 and the press plate 23. Further, the plurality of bolts 29 are arranged at equal intervals on the same circumference, and are tightened by a tightening tool such as an impact wrench to uniformly press the peripheral edge of the wire net 22. As described above, according to the sixth to eighth structures of the suction cylinder of the present invention, since the wire netting 22 and the pressing plate 23 are superposed on the perforated plate 21, they are fixed by mechanical fastening. In the annular step portion 27, the welding bead 28 for fillet full circumference welding can be eliminated, and the welding work can be simplified. Further, in the ninth embodiment shown in FIG. 11, the pressing plate 23 is eliminated and the wire netting 22 is directly fixed by the bolts 29, so that the fastening structure by the bolts 29 can be realized more simply.

It should be noted that the present invention is not limited to the above-described embodiment, and the shape of the cylinder and the arrangement of each member can be appropriately changed depending on the environment in which the suction cylinder is used. It suffices that the height position of the member can be set in consideration of gas flow, and a jig that can be removed when performing butt full circumference welding (main welding) is also included. In addition, if the annular gap portion or the annular step portion is obtained by utilizing the diameter difference of each circular member, the size of the root gap is arbitrary in the butt full circumference welding, and the peripheral edge of each member may be used as necessary. A groove may be processed on the part. Further, in the fillet full circumference welding, it is possible to form only one of the inner peripheral surface side of the pressing plate or the annular step portion together with the outer peripheral surface side. In addition, from the viewpoints of weight reduction and cost reduction, it is preferable to adopt a structure in which bolting with less distortion is adopted in the fixing portion when thinning the cylindrical body.

Further, the pressing plate is not limited to the three-divided shape, and may be one annular member. Further, in the above-described embodiment, a PSA device such as nitrogen PSA or oxygen PSA that removes a target gas by removing specific impurity components (nitrogen, oxygen, methane, carbon dioxide, carbon monoxide, water, hydrogen, etc.) is taken as an example. However, it may be applied to a TSA device used for a pretreatment adsorber of an air separation device.

11... Adsorption cylinder, 12... Adsorbent, 13... Cylindrical body, 13a... Upper mirror plate, 13b... Lower mirror plate, 14... Upper cylindrical member, 14a... Lower edge part, 14b... Flange part, 15... Lower cylindrical member, 15a... Upper end peripheral portion, 15b... Insertion hole, 16... Closure plate, 16a... Gas flow hole, 17... Nozzle, 18... Base plate, 19... Nozzle, 19a... Bend portion, 19b... Tip opening, 20... Support member, 21... Eye Plate, 21a... Through hole, 22... Wire mesh, 23... Holding plate, 23a... Divided body, 24... Gap, 25... Annular gap, 26... Weld bead, 27... Annular step, 28... Weld bead, 29... bolt

Claims (4)

In the adsorption cylinder in which the adsorbent is filled in the inside of the cylinder, the cylinder has end plates at the upper and lower ends, respectively, and is provided on the upper surface of the base plate at the peripheral portion of the lower end opening formed in the lower end plate. The upper edge of the cylindrical member is welded, and a circular perforated plate having gas flowability is supported inside the cylindrical member by a supporting member provided on the inner peripheral surface of the cylindrical member, and at the same time, on the perforated plate. By disposing an annular holding plate on the upper surface of the laid circular wire net, the eye plate, the wire net, and the holding plate can be vertically stacked to fix each other, and the eye plate and the wire net. A radial annular gap portion is provided between each of the peripheral edges of the holding plate and the inner peripheral surface of the cylindrical member, and the annular gap portion is welded so as to be filled with a welding bead. Characteristic suction cylinder. In the adsorption cylinder in which the adsorbent is filled in the inside of the cylinder, the cylinder has end plates at the upper and lower ends, respectively, and is provided on the upper surface of the base plate at the peripheral portion of the lower end opening formed in the lower end plate. The upper edge of the cylindrical member is welded, and a circular perforated plate having gas flowability is supported inside the cylindrical member by a supporting member provided on the inner peripheral surface of the cylindrical member, and at the same time, on the perforated plate. By arranging an annular holding plate on the upper surface of the laid circular wire netting, the plate, the wire netting, and the holding plate can be stacked vertically and fixed to each other, and the periphery of the plate can be fixed. A radial annular gap is provided between the inner peripheral surface of the cylindrical member, and the peripheral surface of the pressing plate is a vertical peripheral surface by making the diameter of the perforation plate and the pressing plate different from each other. An adsorption cylinder, wherein an annular step portion is provided, and the annular gap portion and the annular step portion are respectively welded so as to be filled with welding beads. In the adsorption cylinder in which the adsorbent is filled in the inside of the cylinder, the cylinder has end plates at the upper and lower ends, respectively, and is provided on the upper surface of the base plate at the peripheral portion of the lower end opening formed in the lower end plate. The upper end peripheral portion of the cylindrical member is welded, a circular perforated plate having gas flowability is arranged on the upper end peripheral portion of the cylindrical member, and an annular presser is provided on the upper surface of the circular wire mesh laid on the perforated plate. By arranging the plates, the perforated plate, the wire netting, and the pressing plate are stacked vertically so that they can be fixed to each other, and the diameters of the perforated plate and the pressing plate are different from each other. An adsorption cylinder, characterized in that an annular step portion is provided having respective peripheral surfaces of the eye plate and the holding plate as vertical peripheral surfaces, and the annular step portion is welded so as to be filled with a welding bead. The wire mesh and the pressing plate are fixed to each other by a plurality of bolts penetrating the wire mesh and the pressing plate in the vertical direction, instead of welding the annular step portion. Adsorption cylinder described.

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