Net-shaped all-dimensional supporting heat exchanger tube bundle

Abstract

The utility model provides a netlike all-dimensional support heat exchanger tube bundle, which comprises a tube plate, a heat exchange tube, a support structure and a distance rod, the heat exchange tube penetrates through the tube plate and the support structure, the distance rod is fixed on the support structure, two ends of the distance rod are connected on the tube plate, the support structure is a netlike porous support and is formed by connecting a plurality of layers of support strips, and the support strips are arranged on the tube plate. The supporting strips are divided into upper trapezoid supporting strips and lower trapezoid supporting strips, the contact faces of the upper trapezoid supporting strips and the lower trapezoid supporting strips are welded to form porous strip-shaped supporting pieces, the heat exchange tubes penetrate through the holes, the length between the centers of the adjacent holes is equal to the tube center distance of the heat exchange tubes, and the four edges of the holes are tangent to the outer walls of the heat exchange tubes to form all-dimensional supporting for the heat exchange tubes. The utility model has the advantages that the single net-shaped support ring can realize linear contact support of the heat exchange pipe, and the anti-vibration capability of the pipe bundle is improved. The supporting strips are formed through compression molding, and installation and maintenance of the tube bundle are convenient.

Description

Technical Field

[0001] The utility model belongs to the field of heat exchangers and relates to a heat exchange tube supporting structure of a shell and tube heat exchanger. Background Art

[0002] Heat exchangers are widely used heat transfer equipment in the petroleum, chemical, food and nuclear power industries. Shell and tube heat exchangers are widely used due to their simple structure and low cost. In the existing design of shell and tube heat exchangers, the main structure is the bow baffle structure, which has the characteristics of simplicity, reliability, strong adaptability and easy processing and manufacturing.

[0003] With the development of large-scale industrial equipment, people pay more attention to the requirements of equipment safety, stability, energy saving and high efficiency. The traditional shell and tube heat exchanger Z-shaped flow baffle has a dead zone, large flow resistance and low heat transfer efficiency. The shell side medium of the baffle rod heat exchanger flows axially, with less dead zone and small flow resistance, which greatly reduces the shell side pressure drop. In addition, the turbulent effect of the baffle rod improves the heat transfer effect, so it has been widely used in recent years.

[0004] The existing baffle rod heat exchanger is fixed by baffle rods in four directions of each heat exchange tube. The baffle rods are welded on the baffle rings. Four baffle rings form a group, clamping the heat exchange tubes from four directions. The tube bundle support structure composed of baffle rings mostly adopts square pipe layout, and the triangular pipe layout cannot achieve compact and stable support, resulting in low heat exchange area loading per unit volume and insufficient utilization of the space in the shell. During the manufacturing process, the heat exchange tubes are installed after the baffle rods are installed. The deformation of the baffle rods during welding makes it easy for the gap between adjacent baffle rods after installation and the designed gap to have a large error, resulting in low pipe threading efficiency when installing the heat exchange tubes. During the operation of the equipment, induced vibrations are easily generated in the gas-liquid two-phase medium or the gas phase medium, causing collision and friction between the baffle rods and the heat exchange tubes, which in turn causes damage to the heat exchange tube wall, resulting in internal leakage of the heat exchanger, affecting the stable and long-term operation of the device. Utility Model Content

[0005] The utility model provides a heat exchanger structure with a mesh-shaped all-round support for heat exchange tubes, so as to overcome the problems mentioned in the background technology.

[0006] The technical solution of the utility model is as follows: a mesh all-round support heat exchanger tube bundle, comprising a tube sheet, a heat exchange tube, a support structure, and a distance rod. The heat exchange tube passes through the tube sheet and the support structure. The distance rod is fixed on the support structure. Both ends of the distance rod are connected to the tube sheet. The support structure is a mesh porous support, which is composed of multiple layers of support bars. The support bars are divided into upper trapezoidal support bars and lower trapezoidal support bars. The contact surfaces of the upper trapezoidal support bars and the lower trapezoidal support bars are welded to form a porous strip support member. The heat exchange tube passes through the hole. The length between the centers of adjacent holes is equal to the center distance of the heat exchange tube. The four sides of the hole are tangent to the outer wall of the heat exchange tube to form an all-round support for the heat exchange tube.

[0007] A plurality of distance rods are evenly arranged along the circumferential direction.

[0008] The distance rod is a square rod or a round rod.

[0009] If the number of heat exchange tubes in different layers varies, the length of the corresponding support bar is set according to the number of heat exchange tubes in each layer.

[0010] Furthermore, the support bars are stacked up and down to form a three-dimensional mesh porous support body with a circular outer contour.

[0011] Furthermore, a support ring is provided around the three-dimensional porous support body with a circular outer contour to fix the support ring. The support ring is divided into two parts, front and rear. The cross-sections of the front and rear parts are both L-shaped. After the two parts are buckled, the three-dimensional porous support body is compressed by welding or bolting.

[0012] Preferably, the width of the support strip is 20-50 mm, and the cross section of the hole formed by the support strip is hexagonal.

[0013] The beneficial effects of the utility model are as follows: a single mesh support ring can realize linear contact support of the heat exchange tube, thereby improving the anti-vibration capability of the tube bundle. The support strip is molded to facilitate installation and maintenance of the tube bundle. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic diagram of the structure of the utility model;

[0015] Figure 2 is a schematic diagram of the connection of a mesh support body;

[0016] Figure 3 is a schematic diagram of assembling the support ring and the mesh support body;

[0017] Figure 4 It is a schematic diagram of the assembly of heat exchange tubes and support rings;

[0018] Figure 5 is the distance between the heat exchange tube layout and the support bar;

[0019] Figure 6This is a simplified structural diagram of a common baffled rod heat exchanger. DETAILED DESCRIPTION

[0020] like Figure 1 As shown, a mesh all-round support heat exchanger tube bundle consists of a tube sheet 1, a heat exchange tube 2, a support structure 3, and a distance rod 4. The heat exchange tube passes through the tube sheet 1 and the support structure 3 in sequence. The distance rod 4 is fixed on the support structure 3, and both ends of the distance rod 4 are connected to the tube sheet 1. Figure 2 As shown, the support structure 3 is a mesh porous support, which is composed of multiple layers of support bars 5 connected together. The support bars 5 are divided into an upper trapezoidal support bar 5-1 and a lower trapezoidal support bar 5-2. The contact surfaces of the upper trapezoidal support bar 5-1 and the lower trapezoidal support bar 5-2 are welded to form a porous strip support member. The heat exchange tube 2 passes through the hole. The four sides of the hole are tangent to the outer wall of the heat exchange tube 2 to form an all-round support for the heat exchange tube.

[0021] A plurality of distance rods are evenly arranged between the mesh porous supports along the circumferential direction. The support bar 5 is composed of a plurality of closely arranged support bars with a width of 20 to 50 mm, and the distance rod 4 can be square or circular in shape. The distance rod 4 and the support structure 3 can be fixed by welding, or the support structure 3 can be separated by a whole rod plus a plurality of sleeves.

[0022] The cross section of each hole of the porous strip support is a hexagon, and the upper and lower sides are shorter than the side sides, close to a rhombus. The length between the centers of adjacent holes is equal to the center distance of the heat exchange tubes, such as Figure 5 As shown, H=L, the four long sides of the hexagon are tangent to the outer wall of the heat exchange tube, forming a line contact, and realizing all-round support of the heat exchange tube in the hole. After the upper and lower layers of support bars are stacked, the same perforations as the support bars are formed to support the heat exchange tube 2. The length of the support bar is set according to the number of pipes in each layer of heat exchange tubes, and the support bars are stacked up and down to form a three-dimensional mesh porous support body with a circular outer contour.

[0023] like Figure 3 , Figure 4 , a support ring 6 is further provided, and the three-dimensional mesh porous support body is placed in the support ring 6 for fixing and limiting. The support ring 6 is divided into two parts, front and back, and its cross section is "L" shaped. The two parts are fastened by welding or bolts after being buckled relative to each other ( Figure 1 The mesh support strips are compressed by methods such as the partial enlargement shown in the figure, and the mesh porous support body is installed in the support ring 6 to maintain good dimensional accuracy and shape roundness, which is convenient for the heat exchange tube 2 to penetrate and the tube bundle to be assembled.

[0024] Comparison with existing baffled rod heat exchangers:

[0025] 1. Figure 6The figure shows a common baffle rod heat exchanger, which is fixed in four directions by baffle rods on each heat exchange tube. The baffle rods are welded on the baffle rings. Four baffle rings form a group, clamping the heat exchange tubes from four directions, and the tube bundle support structure composed of baffle rings. The present invention adopts a single mesh support ring to achieve all-round support for the heat exchange tube, shorten the unsupported spacing of the heat exchange tube, break the original point support of the baffle rod and the heat exchange tube, achieve surface support for the heat exchange tube, prevent the baffle rod from vibrating and wearing the heat exchange tube wall, greatly improve the anti-vibration ability of the tube bundle and extend the service life of the equipment.

[0026] 2. The common baffle rod heat exchanger heat exchanger adopts square tube layout, which cannot achieve compact and stable support for the triangular tube layout, resulting in low heat exchange area loading per unit volume and insufficient utilization of the space inside the shell. The mesh porous support of the present invention adopts a porous strip support, and the cross-section of each hole is close to a diamond shape. The distance between the center lines of adjacent holes is equal to the distance between the centers of the heat exchange tubes, which can achieve triangular tube layout and greatly increase the heat exchange area in the limited space of the equipment.

[0027] 3. In the manufacturing process of common baffle rod heat exchangers, the heat exchange tubes are installed after the baffle rods are installed. The deformation of the baffle rods during welding makes it easy for the gap between adjacent baffle rods after installation to have a large error with the designed gap, resulting in low tube threading efficiency when installing the heat exchange tubes. The support bar of the present invention is molded and then the upper and lower support bars are welded together, with good forming quality and high flatness. The entire support bar does not need to be welded when installed in the support ring, and the overall compression is achieved by the buckling of the support ring, which improves the roundness and dimensional accuracy of the mesh porous support body and facilitates the installation and maintenance of the tube bundle.

Claims

1. A mesh-shaped all-around support heat exchanger tube bundle, comprising a tube sheet (1), a heat exchange tube (2), a support structure (3), and a distance rod (4), wherein the heat exchange tube (2) passes through the tube sheet (1) and the support structure (3), and the distance rod (4) is fixed on the support structure (3), and both ends of the distance rod (4) are connected to the tube sheet (1), characterized in that: The support structure (3) is a mesh porous support, which is composed of multiple layers of support bars (5) connected together. The support bars (5) are divided into upper trapezoidal support bars (5-1) and lower trapezoidal support bars (5-2). The contact surfaces of the upper trapezoidal support bars (5-1) and the lower trapezoidal support bars (5-2) are welded to form a porous strip support member. The heat exchange tube (2) passes through the holes. The length between the centers of adjacent holes is equal to the center distance of the heat exchange tube. The four sides of the holes are tangent to the outer wall of the heat exchange tube (2) to form all-round support for the heat exchange tube.

2. A mesh-shaped all-around support heat exchanger tube bundle according to claim 1, characterized in that: A plurality of the distance rods (4) are evenly arranged along the circumferential direction.

3. The net-shaped all-round support heat exchanger tube bundle according to claim 1, characterized in that: The distance rod (4) is a square rod or a round rod.

4. The net-shaped all-around support heat exchanger tube bundle according to claim 1, characterized in that: In the case where the number of heat exchange tubes arranged in different layers varies, the length of the corresponding support bar (5) is set according to the number of heat exchange tubes arranged in each layer.

5. The net-shaped all-round support heat exchanger tube bundle according to claim 4, characterized in that: The support strips (5) are stacked up and down to form a three-dimensional mesh porous support body with a circular outer contour.

6. The net-shaped all-around support heat exchanger tube bundle according to claim 5, characterized in that: A support ring (6) is provided on the periphery of a three-dimensional mesh porous support body with a circular outer contour to fix and limit the support ring (6). The support ring (6) is divided into a front and a rear part. The cross sections of the front and rear parts are both L-shaped. After the two parts are buckled, the three-dimensional mesh porous support body is compressed by welding or bolting.

7. A mesh-shaped all-around support heat exchanger tube bundle according to any one of claims 1 to 6, characterized in that: The width of the support strip (5) is 20 to 50 mm, and the cross section of the hole formed by the support strip (5) is hexagonal.

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