Core pulling device for shell-and-tube heat exchanger

Abstract

The utility model relates to the technical field of heat exchanger disassembly, in particular to a shell-and-tube heat exchanger core pulling device, a shell-and-tube heat exchanger, a supporting assembly and a traction device, the shell-and-tube heat exchanger comprises a tube bundle, and the traction end of the traction device is coaxially connected with the tube bundle and used for horizontally pulling out the tube bundle from a barrel; the supporting assembly comprises a supporting seat and a sliding supporting structure, the supporting seat is horizontally fixed on the horizontal base plane, the sliding supporting structure is arranged on the supporting seat, and the sliding supporting structure is used for supporting the pulled-out tube bundle in a sliding mode, so that the tube bundle is always coaxial with the barrel in the pulling-out process, and the concentricity of the tube bundle and the barrel is ensured; and meanwhile, the concentricity of the tube bundle and the cylinder body is controlled by continuously adjusting the tube bundle in the core pulling process, so that time and labor are saved in the core pulling operation process.

Description

Technical Field

[0001] The utility model relates to the technical field of heat exchanger disassembly, and particularly to a tube bundle extraction device for a shell-and-tube heat exchanger. Background Art

[0002] The shell-and-tube heat exchanger is a heat exchange device widely used in the fields of chemical industry, energy, etc. During its operation, due to long-term use, corrosion of the medium, fouling, etc., it may be necessary to repair, clean or replace the core body (tube bundle) of the heat exchanger, so the core body needs to be pulled out of the shell.

[0003] At present, a method for removing the tube bundle of a horizontal U-tube heat exchanger disclosed in the existing patent publication number CN109648513B includes the following steps: First, a first chain block is fixed directly above the heat exchanger, and the other end of the first chain block is connected to the tube sheet of the heat exchanger; Second, the front of the tube sheet of the heat exchanger is connected to a movable pulley, a towing rope bypasses the movable pulley, and one end of the towing rope is fixed, and the other end passes through a fixed pulley and is connected to a first crane; Third, one end of the fixed pulley connected to a second chain block is connected, and the other end connected to the second chain block is fixed to the ground; Fourth, start the first crane to tow the towing rope to pull out the tube bundle. However, during the process of pulling out the tube bundle by the method for removing the tube bundle of the horizontal U-tube heat exchanger, it is necessary to manually adjust the connection point between the first chain block and the tube bundle to control the concentricity between the tube bundle and the cylinder body, which will cause the core extraction operation to be time-consuming and laborious.

[0004] In summary, during the process of pulling out the tube bundle by the method for removing the tube bundle of the horizontal U-tube heat exchanger, it is necessary to continuously adjust the tube bundle to control the concentricity between the tube bundle and the cylinder body, resulting in a time-consuming and laborious core extraction process and it is difficult to ensure the concentricity between the tube bundle and the cylinder body. Summary of the Utility Model

[0005] One of the purposes of the utility model is to provide a tube bundle extraction device for a shell-and-tube heat exchanger, aiming to solve the technical problem that during the process of pulling out the tube bundle by the existing method for removing the tube bundle of a horizontal U-tube heat exchanger, it is necessary to continuously adjust the tube bundle to control the concentricity between the tube bundle and the cylinder body, resulting in a time-consuming and laborious core extraction process and it is difficult to ensure the concentricity between the tube bundle and the cylinder body.

[0006] To achieve the above object, the utility model provides a core extraction device for a horizontal shell-and-tube heat exchanger, which includes a shell-and-tube heat exchanger, a traction device and a support assembly. The shell-and-tube heat exchanger includes a cylinder body and a tube bundle. The traction end of the traction device is coaxially connected to the tube bundle and is used to horizontally extract the tube bundle from the cylinder body. The support assembly includes a support base and a sliding support structure. The support base is horizontally arranged on a horizontal base surface, and the sliding support structure is arranged on the support base and is used to slidably support the extracted tube bundle so that the tube bundle always remains coaxial with the cylinder body during the extraction process.

[0007] Further, the sliding support structure includes a plurality of support sliding tubes. The plurality of support sliding tubes are sequentially arranged at intervals along the axial direction of the tube bundle. Each support sliding tube is horizontally rotatably arranged on the support base. The rotation axis of the support sliding tube is perpendicular to the axial direction of the tube bundle, and the support sliding tube is in sliding contact with the lower surface of the extracted tube bundle.

[0008] Further, a plurality of semi-circular grooves are formed on the upper surface of the support base. The extending direction of each semi-circular groove is perpendicular to the axial direction of the tube bundle. The plurality of semi-circular grooves correspond to the plurality of support sliding tubes one by one. Each support sliding tube is rotatably arranged in each semi-circular groove, and the semi-circular groove is coaxially arranged with the support sliding tube.

[0009] Further, a smooth coating is provided on the outer wall surface of the support sliding tube.

[0010] Further, the distance between two adjacent support sliding tubes is set to L, and the relationship satisfied by L is: 2 ≤ L ≤ 5 cm.

[0011] Further, the support sliding tube is a seamless steel pipe.

[0012] Further, the traction device includes two steel wire ropes and an electric chain hoist. The first ends of the two steel wire ropes are respectively connected to the opposite sides of the tube bundle, and the second ends of the two steel wire ropes are connected to each other. The two steel wire ropes are axisymmetric with respect to the axis of the axial direction of the tube bundle, so that the connection of the two steel wire ropes forms a V-shaped structure. A fixing seat extending in the vertical direction is arranged at the end of the support base far from the shell-and-tube heat exchanger. The electric chain hoist is arranged on the fixing seat. The traction chain of the electric chain hoist is connected to the second end of the steel wire rope, and the traction chain of the electric chain hoist is coaxial with the tube bundle in the traction state.

[0013] Further, two lifting lugs are circumferentially arranged on the tube sheet of the tube bundle. The two lifting lugs are symmetrically arranged with respect to the center of the tube bundle, and the first ends of the two steel wire ropes are respectively connected to the two lifting lugs.

[0014] Compared with the prior art, the beneficial effects of the utility model are:

[0015] When the tube bundle extraction device of the shell-and-tube heat exchanger of the present utility model is in use, the tube bundle is horizontally extracted from the cylinder body through the traction device. During the process of extracting the tube bundle, the tube bundle is always slidably supported by the sliding support structure on the support base, so that the tube bundle always remains coaxial with the cylinder body during the extraction process, ensuring the concentricity between the tube bundle and the cylinder body. At the same time, it is avoided that the concentricity between the tube bundle and the cylinder body needs to be continuously adjusted during the core extraction process, thereby avoiding the time-consuming and laborious core extraction operation process. Description of the Drawings

[0016] Figure 1 It is a schematic structural diagram of the tube bundle extraction device of the shell-and-tube heat exchanger of the present utility model.

[0017] Reference numerals in each drawing:

[0018] 1. Shell-and-tube heat exchanger; 10. Cylinder body; 11. Tube bundle; 110. Tube sheet; 111. Lifting lug; 2. Horizontal base surface; 3. Traction device; 30. Steel wire rope; 31. Electric chain hoist; 310. Traction chain; 32. Fixed seat; 4. Support assembly; 40. Support base; 41. Support sliding tube. Detailed Embodiments

[0019] It should be understood that the specific embodiments described herein are only used to explain the present utility model and are not used to limit the present utility model.

[0020] In the description of the present utility model, it should be understood that the orientation or positional relationship indicated by the terms "width", "upper", "lower", "front", "rear", "top", "bottom", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present utility model.

[0021] In the description of the present utility model, it should be noted that unless otherwise clearly specified and limited, the terms "installation", "connection", "connection", "setting" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, a direct connection, or an indirect connection through an intermediate medium, and it can be the internal communication of two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0022] In the present utility model, unless otherwise clearly defined and limited, the first feature being "above" or "below" the second feature may include the direct contact of the first and second features, or may include the situation where the first and second features are not in direct contact but in contact through additional features therebetween. Moreover, the first feature being "above", "over" and "on the top of" the second feature includes the first feature being directly above and obliquely above the second feature, or merely indicating that the horizontal height of the first feature is higher than that of the second feature. The first feature being "below", "under" and "beneath" the second feature includes the first feature being directly below and obliquely below the second feature, or merely indicating that the horizontal height of the first feature is lower than that of the second feature.

[0023] Please refer to Figure 1 , the present utility model provides a tube bundle extraction device for a shell-and-tube heat exchanger, which includes a shell-and-tube heat exchanger 1, a traction device 3 and a support assembly 4. The horizontal shell-and-tube heat exchanger 1 includes a shell 10 and a tube bundle 11. The shell 10 is the housing of the heat exchanger, and the tube bundle 11 is the core of the heat exchanger. The shell 10 is horizontally installed and fixed on a horizontal base surface 2, and the tube bundle 11 is assembled in the shell 10. Among them, taking the direction in which the tube bundle 11 is horizontally pulled out from the shell 10 as the front of the shell-and-tube heat exchanger 1, the traction device 3 is located in front of the shell-and-tube heat exchanger 1. The traction end of the traction device 3 is coaxially connected to the tube bundle 11 of the shell-and-tube heat exchanger 1. The traction device 3 is used to horizontally extract the tube bundle 11 from the shell 10. The support assembly 4 includes a support seat and a sliding support structure. The support seat is horizontally arranged on the horizontal base surface 2 and is located in front of the shell-and-tube heat exchanger 1. The sliding support structure is arranged on the support seat and is used to slidably support the extracted tube bundle 11, so that the tube bundle 11 always remains coaxial with the shell 10 during the extraction process.

[0024] In summary, it can be understood that when the tube bundle extraction device of the shell-and-tube heat exchanger 1 of the present utility model is in use, the tube bundle 11 is horizontally extracted from the shell 10 through the traction device 3. During the extraction process of the tube bundle 11, the tube bundle 11 is always slidably supported by the sliding support structure on the support seat, so that the tube bundle 11 always remains coaxial with the shell 10 during the extraction process, ensuring the concentricity between the tube bundle 11 and the shell 10, and at the same time avoiding the need to continuously adjust the tube bundle 11 to control the concentricity between the tube bundle 11 and the shell 10 during the core extraction process, thereby avoiding the time-consuming and laborious core extraction operation process.

[0025] In this embodiment, the sliding support structure includes a plurality of support sliding tubes 41. The plurality of support sliding tubes 41 are arranged at intervals in sequence along the axial direction of the tube bundle 11. Each support sliding tube 41 is horizontally rotatably arranged on the upper surface of the support base. The opposite ends of the support sliding tube 41 can be arranged on the opposite sides of the support base through pedestal bearings, so that the support sliding tube 41 can rotate relative to the support base on the upper surface of the support base. Of course, the rotation axis of the support sliding tube 41 is perpendicular to the axial direction of the tube bundle 11. The support sliding tube 41 is in sliding contact with the lower surface of the tube bundle 11 to be withdrawn. The distance from the upper surface of the support base 40 to the horizontal base surface 2 is set as H1, the diameter of the support sliding tube 41 is set as D, and the distance from the lower surface of the tube bundle 11 to the horizontal base surface 2 is set as H2. Then the relationship satisfied among H1, D, and H2 is: H1 + D = H2. In this way, when the tube bundle 11 is withdrawn from the cylinder 10 under the traction force of the traction device 3, it is always slidably supported by the support sliding tube 41, avoiding the influence of the gravity of the tube bundle 11 on the concentricity between the tube bundle 11 and the cylinder 10, so as to ensure that the tube bundle 11 is always coaxial with the cylinder 10 during the extraction process, and further ensure the concentricity between the tube bundle 11 and the cylinder 10.

[0026] Of course, in other embodiments, a plurality of semi-circular grooves are also formed on the upper surface of the support base. The extending direction of each semi-circular groove is perpendicular to the axial direction of the tube bundle 11. The plurality of semi-circular grooves correspond to the plurality of support sliding tubes 41 one by one. Each support sliding tube 41 is rotatably arranged in each semi-circular groove. The semi-circular groove and the support sliding tube 41 are coaxially arranged. In this way, half of the area of the support sliding tube 41 is located inside the semi-circular groove, and the other half is located outside the semi-circular groove. The relationship satisfied among H1, D, and H2 is: H1 + D / 2 = H2. In this way, when the tube bundle 11 is withdrawn from the cylinder 10 under the traction force of the traction device 3, it is always slidably supported by the support sliding tube 41, and similarly, the influence of the gravity of the tube bundle 11 on the concentricity between the tube bundle 11 and the cylinder 10 can be avoided, so as to ensure that the tube bundle 11 is always coaxial with the cylinder 10 during the extraction process, and further ensure the concentricity between the tube bundle 11 and the cylinder 10.

[0027] In another embodiment, the sliding support structure may also include a plurality of rollers that are rollably arranged on the upper surface of the support base. The rotation axes of the plurality of rollers are perpendicular to the axis in the axial direction of the tube bundle 11. The rolling surfaces of the plurality of rollers are in sliding contact with the lower surface of the tube bundle 11 to be withdrawn, and can also play the role of slidably supporting the withdrawn tube bundle 11. Therefore, for those skilled in the art, by reasonably changing the sliding support structure to achieve the effect of slidably supporting the tube bundle 11, it should also fall within the protection scope of the present invention.

[0028] In this embodiment, a smooth coating is applied to the outer wall surface of the support sliding tube 41, which can reduce the friction force between the support sliding tube 41 and the tube bundle 11, facilitating the extraction of the tube bundle 11 by the traction device 3. The support sliding tube 41 is a seamless steel pipe. Specifically, the support sliding tube 41 is selected as a DN150 steel pipe, which is beneficial to further reduce the friction force between the support sliding tube 41 and the tube bundle 11. In addition, the distance between two adjacent support sliding tubes 41 is set to L, and the relationship satisfied by L is: 20 ≤ L ≤ 30 cm. L in this embodiment is 20 cm, which can ensure that the tube bundle 11 slides smoothly on each support sliding tube 41; in other embodiments, L can also be 30 cm or 25 cm, which is not limited here.

[0029] In this embodiment, the traction device 3 includes two steel wires 30 and an electric chain hoist 31. The electric chain hoist 31 is also called an electric hoist, and the electric chain hoist 31 is an electric hoist; the first ends of the two steel wires 30 are respectively connected to the opposite sides of the tube bundle 11, the second ends of the two steel wires 30 are connected to each other, and the two steel wires 30 are axisymmetric about the axis of the tube bundle 11 in the axial direction, so that the connection of the two steel wires 30 forms a V-shaped structure; a fixing seat 32 extending in the vertical direction is provided at the end of the support seat far from the shell-and-tube heat exchanger 1. The fixing seat 32 is a steel member, and the electric chain hoist 31 is arranged on the fixing seat 32. The traction chain 310 of the electric chain hoist 31 is connected to the second end of the steel wire 30, and the traction chain 310 of the electric chain hoist 31 is coaxial with the tube bundle 11 in the traction state. In this way, under the traction force of the electric chain hoist 31, the tube bundle 11 is extracted from the cylinder 10. During the extraction process of the tube bundle 11, the tube bundle 11 is always slidably supported by the support sliding tube 41 throughout the process, avoiding affecting the concentricity of the tube bundle 11 and the cylinder 10 due to the gravity of the tube bundle 11.

[0030] It should be noted that the fixing point of the electric chain hoist 31 on the fixing seat 32 can be determined by the axis of the tube bundle 11 in the axial direction, so as to ensure that the traction chain 310 of the electric chain hoist 31 is coaxial with the tube bundle 11.

[0031] Of course, in other embodiments, the traction device 3 can also adopt the structure of the traction device 3 in a method for removing the tube bundle 11 of a horizontal U-tube heat exchanger disclosed in CN109648513B, which is not limited here.

[0032] In addition, two lifting lugs 111 are circumferentially arranged on the tube sheet 110 of the tube bundle 11. The tube sheet 110 is fixedly connected to the tube bundle 11. The two lifting lugs 111 are symmetrically arranged about the center of the tube bundle 11. The first ends of the two steel wires 30 are respectively connected to the two lifting lugs 111, which is convenient for connecting the steel wires 30 to the tube sheet 110 on the tube bundle 11.

[0033] The above are only the preferred embodiments of the present utility model, and do not thus limit the patent scope of the present utility model. Any equivalent structure or equivalent process transformation made by using the content of the specification and drawings of the present utility model, or directly or indirectly applied in other related technical fields, shall similarly be included within the patent protection scope of the present utility model.

Claims

1. A tube-sheet heat exchanger core-pulling device, comprising a tube-sheet heat exchanger and a traction device. The tube-sheet heat exchanger includes a shell and a tube bundle. The traction end of the traction device is coaxially connected to the tube bundle and is used to horizontally pull the tube bundle out of the shell. It is characterized in that, The core-pulling device further includes a support assembly, and the support assembly includes a support base and a sliding support structure. The support base is horizontally arranged on a horizontal base surface, and the sliding support structure is arranged on the support base and is used for slidingly supporting the tube bundle to be pulled out, so that the tube bundle always remains coaxial with the cylinder body during the process of being pulled out.

2. The tube bundle heat exchanger core pulling device according to claim 1, characterized in that, The sliding support structure includes a plurality of support sliding tubes, and the plurality of support sliding tubes are sequentially arranged at intervals along the axial direction of the tube bundle. Each support sliding tube is horizontally and rotatably arranged on the support base, the rotation axis of the support sliding tube is perpendicular to the axial direction of the tube bundle, and the support sliding tube is in sliding contact with the lower surface of the tube bundle to be pulled out.

3. The tube-sheet heat exchanger core-pulling device according to claim 2, wherein A plurality of semi-circular grooves are formed on the upper surface of the support base, the extending direction of each semi-circular groove is perpendicular to the axial direction of the tube bundle, the plurality of semi-circular grooves correspond to the plurality of support sliding tubes one by one, each support sliding tube is rotatably arranged in each semi-circular groove, and the semi-circular groove is coaxially arranged with the support sliding tube.

4. The tube-sheet heat exchanger core-pulling device according to claim 2, wherein, A smooth coating is applied to the outer wall surface of the support sliding tube.

5. The tube bundle heat exchanger core-pulling device according to claim 2, characterized in that, The distance between two adjacent support sliding tubes is set to L, and the relationship satisfied by L is: 20 ≤ L ≤ 30 cm.

6. The tube bundle heat exchanger core-pulling device according to claim 2, characterized in that, The support sliding tube is a seamless steel pipe.

7. The tube bundle heat exchanger core-pulling device according to claim 1, characterized in that, The traction device includes two steel wire ropes and an electric chain hoist. The first ends of the two steel wire ropes are respectively connected to the opposite sides of the tube bundle, the second ends of the two steel wire ropes are connected to each other, and the two steel wire ropes are mirror-symmetrical about the axis in the axial direction of the tube bundle, so that the connection of the two steel wire ropes forms a V-shaped structure; a fixing seat extending in the vertical direction is arranged at the end of the support base far away from the shell-and-tube heat exchanger, the electric chain hoist is arranged on the fixing seat, the traction chain of the electric chain hoist is connected to the second end of the steel wire rope, and the traction chain of the electric chain hoist is coaxial with the tube bundle in the traction state.

8. The tube bundle heat exchanger core-pulling device according to claim 7, characterized in that, Two lifting lugs are circumferentially arranged on the tube sheet of the tube bundle, the two lifting lugs are arranged in a mirror-symmetrical manner about the center of the tube bundle, and the first ends of the two steel wire ropes are respectively connected to the two lifting lugs.

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