Multitube heat exchanger

Abstract

To provide a multitube heat exchanger capable of suppressing accumulation of scale or the like inside a barrel part shell.SOLUTION: A multitube heat exchanger includes: a barrel part shell which is formed cylindrically; an inflow head which is attached to an inlet-side opening end part of the barrel part shell and has a heat-exchanged fluid inflow nozzle for introducing a heat-exchanged fluid; a plurality of heat transfer tubes 8 which are housed in the barrel part shell and into which the heat-exchanged fluid flows from the inflow head; a heat transfer medium inflow nozzle which is attached to a peripheral surface of the barrel part shell, communicates with an interior of the barrel part shell, and allows a heat transfer medium for exchanging heat with the heat-exchanged fluid to flow in; and a plurality of baffle plates 7 which are disposed inside the barrel part shell to support the heat transfer tubes 8, wherein each of the plurality of baffle plates 7 is formed with insertion holes through which the heat transfer tubes 8 are inserted, and is formed in an impeller shape that has a spiral shape in plan view and is twisted in a height direction.SELECTED DRAWING: Figure 3

Description

[Technical field]

[0001] The present invention relates to a shell-and-tube heat exchanger. [Background technology]

[0002] Conventionally, there is known a multi-tube heat exchanger in which multiple cooling pipes are arranged inside a cylindrical body, and an object to be cooled passing through the cooling pipes is cooled by a cooling medium passing inside the cylindrical body (for example, Patent Document 1). In the multi-tube heat exchanger of Patent Document 1, multiple partition plates are arranged inside the cylindrical body, and the positions of the flow holes formed in the multiple partition plates are offset from each other. As a result, in Patent Document 1, the coolant passing through the cylindrical body is swirled to create turbulent flow, thereby promoting heat exchange. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent Publication No. 2022-81037 Summary of the Invention [Problem to be solved by the invention]

[0004] However, in Patent Document 1, the position of the flow holes formed in the partition plate is simply shifted, so that a sufficient swirling flow cannot be obtained, and there is a problem that the coolant partially stagnates on the back side of the partition plate inside the cylindrical body, and there is a risk of scale and the like accumulating.

[0005] An object of the present invention is to provide a multi-tube heat exchanger capable of suppressing accumulation of scale and the like inside a body shell. [Means for solving the problem]

[0006] The multi-tube heat exchanger of the present invention comprises a body shell formed in a cylindrical shape, an inflow head attached to an inflow side open end of the body shell and having a heat exchange fluid inflow nozzle for allowing a heat exchange fluid to flow in, heat transfer tubes housed in the body shell and into which the heat exchange fluid flows in from the inflow head, a heat transfer medium inflow nozzle attached to a circumferential surface of the body shell and communicating with the inside of the body shell for allowing the flow of a heat transfer medium that exchanges heat with the heat exchange fluid, and a plurality of partition plates disposed inside the body shell and supporting the heat transfer tubes, the plurality of partition plates being characterized in that they have insertion holes formed therein through which the heat transfer tubes are inserted and are formed in an impeller shape that is spiral in shape and twisted in the height direction when viewed from above.

[0007] In the present invention, a heat exchange fluid flows inside a heat transfer tube housed in a cylindrical body shell. The heat transfer medium is then introduced into the body shell by a heat transfer medium inlet nozzle. This enables heat exchange between the heat transfer medium flowing inside the body shell and the heat exchange fluid flowing inside the heat transfer tube. Here, in the present invention, the multiple partition plates supporting the heat transfer tubes are formed in an impeller shape that is spiral in plan view and twisted in the height direction. As a result, the heat transfer medium flowing through the body shell flows along the shape of the partition plates that are formed in an impeller shape, so that it is possible to prevent the heat transfer medium from stagnating behind the partition plates. Furthermore, it is difficult for a difference in flow rate of the heat transfer medium to occur within the body shell. Therefore, it is possible to prevent scale, sludge, and the like from accumulating within the body shell.

[0008] In the multi-tube heat exchanger of the present invention, the inlet head preferably has an inner surface that is glass-lined. In this configuration, the inner surface of the inlet head is glass-lined, so that even if the heat exchange fluid is corrosive, the inner surface of the inlet head can be prevented from being corroded by the heat exchange fluid.

[0009] In the multi-tube heat exchanger of the present invention, it is preferable that an outlet head is provided at the outlet side opening end of the body shell, and the heat transfer tubes are arranged so that their central axes are inclined downward with respect to the horizontal direction from the inlet side opening end to the outlet side opening end of the body shell. In this configuration, the central axis of the heat transfer tube is inclined downward from the inlet open end to the outlet open end with respect to the horizontal direction, so that the heat exchange fluid that has flowed in from the inlet head can be easily discharged to the outlet head. Therefore, when the heat exchange fluid in the inlet head is discharged through the heat transfer tube, the amount of the heat exchange fluid remaining in the inlet head and the heat transfer tube can be reduced. [Brief description of the drawings]

[0010] [Figure 1] 1 is a front view showing an outline of a multi-tube heat exchanger according to an embodiment of the present invention; [Diagram 2] FIG. 2 is a cross-sectional view showing an outline of the multi-tube heat exchanger according to the embodiment. [Diagram 3] FIG. 4 is a side view showing an outline of the partition plate and the heat transfer tube of the embodiment. [Figure 4] FIG. 4 is a side view showing an outline of the partition plate of the embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0011] [Embodiment] A multi-tubular heat exchanger 1 according to one embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a front view showing an outline of a multi-tubular heat exchanger 1 of the present embodiment, and FIG. 2 is a cross-sectional view showing an outline of the multi-tubular heat exchanger 1. As shown in FIG. As shown in Figures 1 and 2, the multi-tubular heat exchanger 1 is formed as a pressure vessel and has a body shell 2, an inlet head 3, an outlet head 4, legs 5, a first tube plate 61, a second tube plate 62, a partition plate 7, heat transfer tubes 8, and fastening members 9.

[0012] [Body shell 2] The body shell 2 has a body shell main body 21, a flange portion 22, a connecting portion 23, a heat transfer medium inlet nozzle 24, a heat transfer medium outlet nozzle 25, and a support bolt 26. The trunk shell main body 21 is a cylindrical member made of metal and houses a plurality of heat transfer tubes 8 therein. In addition, a first tube sheet 61 is attached to an inflow side opening end 211 of the trunk shell main body 21, and a second tube sheet 62 is attached to an outflow side opening end 212 of the trunk shell main body 21. The flange portion 22 has a first flange portion 221 and a second flange portion 222. The first flange portion 221 is attached to the inlet side opening end 211 of the trunk shell main body portion 21, and the second flange portion 222 is attached to the outlet side opening end 212 of the trunk shell main body portion 21.

[0013] The connecting part 23 is a cylindrical metal member that is attached to the bottom of the peripheral surface of the trunk shell main body 21 near the outlet side open end 212 of the trunk shell main body 21 and communicates with the inside of the trunk shell main body 21. The connecting part 23 has a base 231 and a cover part 232. The base 231 is formed in a cylindrical shape, and one end side is joined and attached to the bottom of the trunk shell main body 21. The cover lid 232 is formed in a semi-ellipsoid shape, and is joined to the base 231 so as to cover the opening on the other end side of the base 231.

[0014] The heat transfer medium inflow nozzle 24 is a nozzle for inflowing a heat transfer medium, and has a main body pipe portion 241 and a flange portion 242. Note that an example of the heat transfer medium is cooling water for cooling the heat exchange fluid. The main body pipe section 241 is a cylindrical member made of metal, and is disposed so as to penetrate the top of the cover 232 of the connecting section 23. In this embodiment, the main body pipe section 241 and the cover 232 are joined by welding. In addition, a flange section 242 is attached to one open end of the main body pipe section 241.

[0015] The heat transfer medium outlet nozzle 25 is a tubular member made of metal, and is joined to the top of the torso shell main body 21 near the inlet side opening end 211, and communicates with the inside of the torso shell main body 21. In this embodiment, the heat transfer medium outlet nozzle 25 is joined to the torso shell main body 21 by welding. The heat transfer medium that flows in from the heat transfer medium inlet nozzle 24 flows inside the torso shell main body 21 and flows out from the heat transfer medium outlet nozzle 25. Therefore, when the heat transfer medium is flowed in, air is discharged from the heat transfer medium outlet nozzle 25 attached to the top of the torso shell main body 21, so that it is possible to prevent air from accumulating in the torso shell main body 21.

[0016] The support bolts 26 are so-called long bolts made of metal, and are members that support the multiple partition plates 7 stored inside the trunk shell main body 21. In this embodiment, multiple support bolts 26 are provided, and one end of each support bolt 26 is supported by the first tube plate 61, and the other end is supported by the second tube plate 62.

[0017] [Inlet head 3] The inlet head 3 is made of metal and has an inner surface that is glass-lined. The inlet head 3 has an inlet head main body 31, a heat exchange fluid inlet nozzle 32, a flange portion 33, and an end plate portion . The inflow head main body 31 is formed in a cylindrical shape, with a flange portion 33 joined to one open end and an end plate portion 34 joined to the other open end. The heat exchange fluid inflow nozzle 32 is a nozzle for inflowing the heat exchange fluid that undergoes heat exchange by the heat transfer medium, and is attached to the top of the inflow head main body 31. In this embodiment, the heat exchange fluid inflow nozzle 32 is joined to the inflow head main body 31 by welding. Examples of the heat exchange fluid include an acidic solution or an organic solvent that is cooled by the heat transfer medium.

[0018] The flange portion 33 is fastened to a first flange portion 221 of the body shell 2 by a first fastening member 91 described later. In this way, the inlet head 3 is attached to the body shell main body portion 21. The end plate portion 34 is a metal member and is formed in a semi-ellipsoid shape that curves toward the top.

[0019] [Outflow Head 4] The outflow head 4 is made of metal and has an inner surface that is glass-lined. The outflow head 4 has an outflow head main body 41, a heat exchange fluid outflow nozzle 42, and a flange portion 43.

[0020] The heat exchange fluid outlet nozzle 42 is a nozzle for causing the heat exchange fluid to flow out. In this embodiment, the heat exchange fluid outlet nozzle 42 has the same diameter as the end of the outlet head main body 41. The flange portion 43 is fastened to the second flange portion 222 of the body shell 2 by a second fastening member 92 described later. As a result, the outflow head 4 is attached to the body shell main body 21 via the second flange portion 222.

[0021] [Leg 5] The legs 5 are metal members attached to the bottom of the trunk shell main body 21 to support the trunk shell main body 21. In this embodiment, two legs 5 are attached to the trunk shell main body 21. However, the configuration is not limited to the above, and for example, one leg 5 or three or more legs 5 may be attached. In addition, the legs 5 support the body shell main body 21 so that the central axis P of the body shell main body 21 is inclined slightly downward with respect to the horizontal direction from the inlet side opening end 211 to the outlet side opening end 212 of the body shell main body 21. In other words, the body shell main body 21 is supported by the legs 5 so that the central axis P extends along a substantially horizontal direction. However, the present invention is not limited to the above configuration. For example, the legs 5 may support the trunk shell main body 21 so that the central axis P is parallel to the horizontal direction.

[0022] [1st tube plate 61] The first tube sheet 61 is a disk-shaped metallic member, and as described above, is attached to the inlet side opening end 211 of the trunk shell main body 21. In other words, the first tube sheet 61 is disposed so as to separate the inlet head 3 and the trunk shell main body 21. The surface of the first tube sheet 61 on the inlet head 3 side is glass-lined. Further, the first tube plate 61 is formed with a plurality of insertion holes into which the heat transfer tubes 8 are inserted.

[0023] [Second tube plate 62] The second tube sheet 62 is a disk-shaped member made of metal, and as described above, is joined and attached to the outlet side open end 212 of the trunk shell main body 21. In other words, the second tube sheet 62 is disposed so as to separate the outlet head 4 and the trunk shell main body 21. The surface of the second tube sheet 62 facing the outlet head 4 is glass-lined. Further, the second tube plate 62 is formed with a plurality of insertion holes into which the heat transfer tubes 8 are inserted.

[0024] [Partition 7] FIG. 3 is a side view showing an outline of the partition plate 7 and the heat transfer tubes 8 of this embodiment, and FIG. 4 is a side view showing a state in which the heat transfer tubes 8 in FIG. 3 have been removed. 2 to 4, in this embodiment, a plurality of partition plates 7 are arranged inside the body shell main body 21 of the body shell 2. More specifically, the multiple partition plates 7 are arranged at equal intervals inside the body shell main body 21.

[0025] Each partition plate 7 has a first insertion hole 71 formed at a position corresponding to the heat transfer tube 8. As a result, the heat transfer tube 8 is supported by the partition plate 7 by being inserted into the first insertion hole 71 of the partition plate 7. Further, second insertion holes 72 are formed in each partition plate 7 at positions corresponding to the support bolts 26. As a result, the partition plate 7 is supported by the support bolts 26 by inserting the support bolts 26 into the second insertion holes 72.

[0026] Here, in this embodiment, each partition plate 7 is formed in an impeller shape that is spirally twisted in the height direction in a plan view. As a result, the heat transfer medium flowing through the body shell main body 21 of the body shell 2 flows along the shape of the partition plate 7 that is formed in an impeller shape. Furthermore, the partition plate 7 restricts the flow path through which the heat transfer medium passes. More specifically, the heat transfer medium passes between the blades of the partition plate 7, so that a flow rate difference of the heat transfer medium in the body shell main body 21 is unlikely to occur. Therefore, it is possible to prevent the occurrence of a place where the heat transfer medium stagnates, for example, on the back side of the partition plate 7, in the body shell main body 21, and therefore it is possible to prevent the accumulation of scale, sludge, etc. in the body shell main body 21.

[0027] [Heat transfer tube 8] The heat transfer tubes 8 are tubular members made of metal, and the inner surface is treated with a corrosion-resistant glass material. In this embodiment, a plurality of heat transfer tubes 8 are housed in the trunk shell main body 21. One end of each heat transfer tube 8 is inserted into an insertion hole in the first tube plate 61, the other end is inserted into an insertion hole in the second tube plate 62, and the middle portion is inserted into the first insertion hole 71 in the partition plate 7. That is, each heat transfer tube 8 is supported by the first tube plate 61, the second tube plate 62, and the partition plate 7.

[0028] [Fastening member 9] The fastening member 9 has a first fastening member 91 and a second fastening member 92 . As described above, the first fastening member 91 is a fastener that fastens the first flange portion 221 of the body shell 2 and the flange portion 33 of the inlet head 3. Although some parts are not shown in Fig. 1, a plurality of first fastening members 91 are provided along the circumferential direction of the first flange portion 221 and the flange portion 33. This provides a tight seal between the inlet head 3 and the body shell 2.

[0029] As described above, the second fastening member 92 is a fastener that fastens the second flange portion 222 of the body shell 2 and the flange portion 43 of the outlet head 4. Although some parts are not shown in FIG. 1, a plurality of second fastening members 92 are provided along the circumferential direction of the second flange portion 222 and the flange portion 43. This provides a tight seal between the outlet head 4 and the body shell 2.

[0030] In addition, in this embodiment, as described above, the legs 5 support the torso shell main body 21 such that the central axis P of the torso shell main body 21 is inclined slightly downward from the horizontal direction from the inlet side opening end 211 toward the outlet side opening end 212 of the torso shell main body 21, and therefore the heat transfer tubes 8 are inclined similarly. This makes it easier for the heat exchange fluid that has flowed in from the inlet head 3 to flow out to the outlet head 4, so that when the heat exchange fluid from the inlet head 3 is discharged through the heat transfer tubes 8, the amount of heat exchange fluid remaining in the inlet head 3 and the heat transfer tubes 8 can be reduced.

[0031] As described above, according to the multi-tubular heat exchanger 1 of this embodiment, the following effects can be obtained. (1) In this embodiment, a heat exchange fluid flows inside the heat transfer tubes 8 housed in the body shell 2 formed in a cylindrical shape. The heat transfer medium is then flowed into the body shell 2 by the heat transfer medium inlet nozzle 24. This enables heat exchange between the heat transfer medium flowing inside the body shell 2 and the heat exchange fluid flowing inside the heat transfer tubes 8. Here, in this embodiment, the multiple partition plates 7 supporting the heat transfer tubes 8 are formed in an impeller shape that is spiral in plan view and twisted in the height direction. As a result, the heat transfer medium flowing inside the body shell 2 flows along the shape of the partition plates 7 that are formed in an impeller shape, so that it is possible to prevent the heat transfer medium from stagnating in places behind the partition plates 7, etc. Furthermore, it is difficult for a difference in flow speed of the heat transfer medium to occur inside the body shell 2. Therefore, it is possible to prevent scale, sludge, and the like from accumulating inside the body shell 2.

[0032] (2) In this embodiment, the inner surface of the inlet head 3 is glass-lined. Therefore, even if the heat exchange fluid is corrosive, the inlet head 3 can be prevented from being corroded by the heat exchange fluid.

[0033] (3) In this embodiment, the central axis P of the heat transfer tube 8 is inclined downward from the horizontal direction from the inlet side open end 211 to the outlet side open end 212, which makes it easier for the heat exchange fluid that has flowed in from the inlet head 3 to flow out to the outlet head 4. Therefore, when the heat exchange fluid of the inlet head 3 is discharged through the heat transfer tube 8, the amount of the heat exchange fluid remaining in the inlet head 3 and the heat transfer tube 8 can be reduced.

[0034] [Variations] The present invention is not limited to the configurations of the above-described embodiments, and modifications within the scope of the present invention are included in the present invention. In the above-described embodiment, the inlet head 3, the outlet head 4, the first tube plate 61, the second tube plate 62, and the heat transfer tubes 8 are glass-lined, but this is not limiting. For example, the present invention also includes a case where the inlet head 3, the outlet head 4, the first tube plate 61, the second tube plate 62, and the heat transfer tubes 8 are not glass-lined.

[0035] In the embodiment described above, the partition plate 7 is supported by the support bolts 26, but this is not limiting. For example, the partition plate 7 may be configured to be supported by a rib-shaped portion provided on the inner peripheral surface of the trunk shell main body 21.

[0036] In the above-described embodiment, the partition plates 7 are arranged at equal intervals inside the trunk shell main body 21, but the present invention is not limited to this. For example, the partition plates 7 may be arranged so that the intervals between them gradually narrow from the inlet head 3 side toward the outlet head 4 side, and the installation width of the partition plates 7 is arbitrary.

[0037] In the above-described embodiment, the first flange portion 221 of the body shell 2 and the flange portion 33 of the inlet head 3 are fastened together by the first fastening member 91, and the second flange portion 222 of the body shell 2 and the flange portion 43 of the outlet head 4 are fastened together by the second fastening member 92. However, the present invention is not limited to this. For example, the first flange portion 221 of the body shell 2 and the flange portion 33 of the inlet head 3 may be fastened together by bolts and nuts, and the second flange portion 222 of the body shell 2 and the flange portion 43 of the outlet head 4 may be fastened together by bolts and nuts.

[0038] In the above-described embodiment, the multi-tubular heat exchanger 1 is configured as a horizontal device in which the body shell 2 is arranged along a substantially horizontal direction, but is not limited thereto. For example, the multi-tubular heat exchanger 1 may be configured as a vertical device in which the body shell 2 is arranged along a vertical direction. [Explanation of symbols]

[0039] 1...multi-tube heat exchanger, 2...body shell, 3...inflow head, 4...outflow head, 5...leg, 61...first tube plate, 62...second tube plate, 7...partition plate 7, 8...heat transfer tube, 9...fastening member, 21...body shell main body, 22...flange portion, 23...connecting portion, 24...heat transfer medium inflow nozzle, 25...heat transfer medium outflow nozzle, 26...support bolt, 31...inflow head main body, 32...heat exchange fluid inflow nozzle, 33...flange portion, 34...end plate portion, 41...outflow head main body, 42...heat exchange fluid outflow nozzle, 43...flange portion, 211...inflow side opening end, 212...outflow side opening end, 231...base, 232...cover portion, 241...main body tube portion, 242...flange portion.

Claims

1. A body shell formed in a cylindrical shape; an inlet head attached to an inlet side opening end of the body shell and having a heat exchange fluid inlet nozzle for inflowing a heat exchange fluid; a heat transfer tube housed in the body shell and into which the heat exchange fluid flows from the inlet head; a heat transfer medium inlet nozzle attached to a peripheral surface of the body shell, communicating with the inside of the body shell, and introducing a heat transfer medium that exchanges heat with the heat exchange fluid; a plurality of partition plates disposed inside the body shell and supporting the heat transfer tubes; The partition plates are formed with insertion holes through which the heat transfer tubes are inserted, and are formed into an impeller shape that is spiral in plan view and twisted in the height direction. A multi-tube heat exchanger characterized by:

2. The multi-tube heat exchanger according to claim 1, The inlet head has an inner surface that is glass-lined. A multi-tube heat exchanger characterized by:

3. The multi-tube heat exchanger according to claim 1, an outlet head attached to an outlet side open end of the body shell; The heat transfer tube is disposed such that a central axis thereof is inclined downward with respect to a horizontal direction from the inlet side open end toward the outlet side open end of the body shell. A multi-tube heat exchanger characterized by:

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