Wound tube type heat exchanger

Abstract

The utility model discloses a coiled tube type heat exchanger, which belongs to the technical field of heat exchange equipment and comprises a barrel and a coiled tube bundle, and two ends of the barrel are provided with end sockets. The winding tube bundle is positioned in the cylinder body and is provided with a plurality of layers of heat exchange tubes; the end sockets are provided with tube pass connecting pipes, the tube pass connecting pipes are communicated with a fluid uniform distribution structure, and the fluid uniform distribution structure conveys tube pass fluid to each layer of heat exchange tubes. By means of the tube pass connecting tube and the fluid uniform distribution structure, tube pass fluid is conveyed to each layer of heat exchange tubes; for each layer of heat exchange tubes, the heat exchange tubes in the layer have a uniform shunting effect; not only are high-material-consumption parts such as tube plates omitted, but also higher shunting consistency is achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of heat exchange equipment, in particular to a coiled tube heat exchanger. Background Art

[0002] Heat exchangers are very important equipment in the chemical production process, playing the role of heat exchange between cold and hot fluids. Figure 1 The barrel, core tube, head, connecting pipe, tube sheet and the wound tube bundle formed by winding a number of heat exchange tubes shown in the figure have the unique self-expansion property of the wound tube bundle, which can realize the self-elimination of stress and adapt to large temperature differences. At the same time, the unique spiral winding structure makes the equipment compact and has a large heat exchange area per unit volume. It has high heat transfer efficiency and high thermal energy utilization rate. The coiled heat exchanger has become the darling of the chemical industry for its high efficiency and energy saving, adaptability to large temperature differences, small size and light weight.

[0003] However, conventional coiled-tube heat exchangers use a form of welding between tube sheets and heat exchange tubes. The tube sheets are thick and require high material consumption, especially under high pressure or strong corrosion conditions, which places higher requirements on tube sheet performance and leads to higher equipment costs. Large coiled-tube heat exchangers and multi-stream coiled-tube heat exchangers have a tube bundle closing structure. After the heat exchange tubes are closed, they are welded to the tube sheets through straight tube sections. The straight tube sections are long, which increases the overall height of the equipment and increases the equipment cost. Utility Model Content

[0004] In order to solve the problems existing in the prior art, the utility model provides a coiled tube heat exchanger, which can realize the local distribution of fluid without using a tube sheet, reduces the equipment material cost, shortens the length of the heat exchange tube, and has a compact structure.

[0005] In order to achieve the above purpose, the technical solution adopted by the utility model is as follows:

[0006] The utility model provides a coiled tube heat exchanger, comprising a cylinder and a coiled tube bundle, wherein both ends of the cylinder are provided with seals; the coiled tube bundle is located in the cylinder and has a plurality of layers of heat exchange tubes;

[0007] The end cap is provided with a tube-side pipe, and the tube-side pipe is connected with a fluid uniform distribution structure, and the fluid uniform distribution structure transports the tube-side fluid to each layer of the heat exchange tubes.

[0008] As a preferred technical solution, the fluid uniform distribution structure includes several layers of annular distribution coils, each layer of the distribution coils corresponds to a layer of the heat exchange tubes; the distribution coils connect the heat exchange tubes and the tube-side connecting pipes.

[0009] As a preferred technical solution, the distribution coil and the heat exchange tube are welded by inner hole welding to achieve a fixed and sealed connection between the two.

[0010] And / or, several layers of the distribution coiled pipes are coaxially arranged with the tube-side nozzle;

[0011] And / or, the distribution coiled pipe is a circular pipe.

[0012] As a preferred technical solution, in the axial direction of the cylinder body, several layers of the distribution coiled pipes are arranged staggeredly.

[0013] As a preferred technical solution, in the radial direction of the cylinder body, the inner diameter of the distribution coiled pipe communicated with the outer-layer heat exchange pipes is larger than the outer diameter of the distribution coiled pipe communicated with the inner-layer heat exchange pipes; the designed distance of the distribution coiled pipe communicated with the outer-layer heat exchange pipes is larger than the designed distance of the distribution coiled pipe communicated with the inner-layer heat exchange pipes.

[0014] As a preferred technical solution, several layers of the distribution coiled pipes are in the same plane perpendicular to the axial direction of the cylinder body and are sleeved in sequence.

[0015] As a preferred technical solution, the distribution coiled pipe located on the outer side is communicated with the adjacent inner-side distribution coiled pipe; the distribution coiled pipe located on the innermost side is communicated with the tube-side nozzle.

[0016] As a preferred technical solution, the fluid distribution structure includes a spherical head, and a spherical flow distribution cavity is arranged inside the spherical head and is communicated with the tube-side nozzle; several layers of third flow distribution holes are arranged on the side wall of the flow distribution cavity in sequence in the axial direction of the tube-side nozzle; each layer of the third flow distribution holes corresponds to one layer of the heat exchange pipes and is communicated.

[0017] As a preferred technical solution, the diameter of the cross section where the third flow distribution holes communicated with the outer-layer heat exchange pipes are located is larger than the diameter of the cross section where the third flow distribution holes communicated with the inner-layer heat exchange pipes are located.

[0018] As a preferred technical solution, supports are arranged on the outer wall of the cylinder body;

[0019] And / or, a flange is arranged at the outer end of the tube-side nozzle;

[0020] And / or, the inner end of the tube-side nozzle is blocked, communication holes are opened on the inner wall of the tube-side nozzle, and the communication holes are located inside the cylinder body and are communicated with the fluid distribution structure.

[0021] The beneficial effects of the present utility model are shown in:

[0022] The shell-and-tube heat exchanger utilizes the tube-side nozzle and the fluid distribution structure to jointly achieve the conveyance of the tube-side fluid to each layer of heat exchange tubes respectively; for each layer of heat exchange tubes, the heat exchange tubes within the layer have a uniform flow splitting effect; compared with the existing method of achieving flow splitting by connecting the tube sheet and the heat exchange tubes, the technical solution of this application not only eliminates the high-consumption component of the tube sheet, greatly saving the material cost of the shell-and-tube heat exchanger, but also has higher flow splitting consistency;

[0023] It can effectively reduce the overall height of the equipment, shorten the length of the heat exchange tubes, reduce the overall investment of the equipment, and at the same time save valuable equipment installation space for customers;

[0024] The competitive advantage of the product is increased, which is conducive to expanding the application scope of the product. Description of the Drawings

[0025] Figure 1 is a schematic structural diagram of a shell-and-tube heat exchanger in the prior art;

[0026] Figure 2 is a schematic overall structural diagram of the first embodiment of the shell-and-tube heat exchanger of the present utility model;

[0027] Figure 3 is a schematic overall structural diagram of the second embodiment of the shell-and-tube heat exchanger of the present utility model;

[0028] Figure 4 is a schematic overall structural diagram of the first embodiment of the fluid distribution structure in the shell-and-tube heat exchanger of the present utility model;

[0029] Figure 5 is a top view of the overall structure of the first embodiment of the fluid distribution structure in the shell-and-tube heat exchanger of the present utility model;

[0030] Figure 6 is a top view of the overall structure of the second embodiment of the fluid distribution structure in the shell-and-tube heat exchanger of the present utility model;

[0031] Figure 7 is a schematic overall structural diagram of the third embodiment of the fluid distribution structure in the shell-and-tube heat exchanger of the present utility model;

[0032] Figure 8 is a schematic structural diagram of the spherical head in the shell-and-tube heat exchanger of the present utility model.

[0033] In the figure:

[0034] 1 - shell; 11 - head;

[0035] 2 - wound tube bundle; 21 - heat exchange tube;

[0036] 3 - Tube - side nozzle; 31 - Main pipe; 32 - First communication hole; 33 - Plugging plate; 34 - Second communication hole; 35 - Flange;

[0037] 4 - Distribution coil pipes; 41 - First distribution coil pipe; 411 - First shunt hole; 42 - Second distribution coil pipe; 421 - Second shunt hole; 43 - Third distribution coil pipe; 44 - Fourth distribution coil pipe;

[0038] 51 - First connecting pipe; 52 - Second connecting pipe; 53 - Third connecting pipe; 54 - Fourth connecting pipe;

[0039] 6 - Spherical head; 61 - Third shunt hole; 62 - Shunt cavity; 63 - Tube - side fluid inlet. Detailed implementation manners

[0040] For the convenience of those skilled in the art to understand, the present utility model will be further described below with reference to the accompanying drawings.

[0041] Please refer to Figures 2 - 3 , which is an embodiment of a wound - tube heat exchanger provided by the present utility model, including a cylinder body 1. Supports can be arranged on the outer wall of the cylinder body 1 according to actual installation needs; shell - side nozzles are arranged on both the shell - side medium inlet and the shell - side medium outlet of the cylinder body 1, and head covers 11 are provided at both ends of the cylinder body 1. A wound tube bundle 2 is arranged inside the cylinder body 1. The wound tube bundle 2 has several layers of heat exchange tubes 21. The innermost layer of heat exchange tubes 21 is wound around a core tube (not shown in the figure). The structure of the heat exchange tubes 21 wound around the core tube is prior art, and no improvement is made in this application, so no further description is given here.

[0042] A tube - side nozzle 3 is fixedly and sealingly connected to the head cover 11. A fluid distribution structure is arranged between the tube - side nozzle 3 and each layer of heat exchange tubes 21. Through the cooperation of the tube - side nozzle 3 at one end of the cylinder body 1 and the fluid distribution structure, the tube - side fluid is evenly transported to each layer of heat exchange tubes 21, and then converges and outputs at the fluid distribution structure at the other end; for each layer of heat exchange tubes 21, the tube - side fluid flowing through each heat exchange tube 21 in this layer is very uniform, which can greatly improve the heat exchange efficiency of the heat exchanger. At the same time, compared with the existing connection method between the heat exchange tubes 21 and the tube sheet, the tube sheet can be saved and the material usage can be reduced.

[0043] Please refer to Figure 4 and Figure 7, the tube-side nozzle 3 includes a main pipe 31. The main pipe 31 is fixedly and hermetically connected to the head 11, and the connection method can be welding or other known fixing and sealing connection methods; one end of the main pipe 31 extends into the cylinder 1, and the other end is located outside the head 11. Hereinafter, the end of the main pipe 31 extending into the cylinder 1 is referred to as the inner end, and the other end of the main pipe 31 is referred to as the outer end. A flange 35 is provided at the outer end of the main pipe 31 for facilitating the connection of the nozzle. The inner end of the main pipe 31 can be closed by a plugging plate 33, and communication holes are opened on the side wall. The number of communication holes is set according to needs. When the number of communication holes is more than one, the communication holes are evenly distributed in the circumferential direction of the main pipe 31; by communicating with the fluid distribution structure through the communication holes, the inertial impact of the tube-side fluid can be reduced, so that the tube-side fluid can be evenly distributed. The inner end of the main pipe 31 can also be designed to be open according to needs, and the tube-side fluid in the main pipe 31 directly enters the fluid distribution structure through the inner end of the main pipe 31.

[0044] Please refer to Figures 2 - 6 , as an embodiment of the fluid distribution structure, the fluid distribution structure includes several layers of annular distribution coiled pipes 4. The number of layers of the distribution coiled pipes 4 is equal to the number of layers of the wound tube bundle 2, that is, each layer of the distribution coiled pipe 4 corresponds to one layer of heat exchange tubes 21 respectively; the distribution coiled pipes 4 communicate the main pipe 31 and the heat exchange tubes 21. The distribution coiled pipes 4 are circular pipes, and the multi-layer distribution ensures uniform stress. Each cross-section of the annular distribution coiled pipes 4 has a circumferential surface covering 360°, so the position and inclination angle of the diversion holes thereon can be set according to needs, and it is no longer limited to the diversion holes extending along the axial direction of the cylinder 1, and can also extend obliquely relative to the axial direction of the cylinder 1; in this way, not only can the uniform diversion of each layer of heat exchange tubes 21 be carried out targeted; and please refer to Figure 3 , the large-scale wound tube heat exchanger or multi-stream wound tube heat exchanger saves the straight pipe section part, and can still significantly reduce the overall height of the equipment.

[0045] The distribution coiled pipes 4 and the heat exchange tubes 21 can be fixedly and hermetically connected by an internal hole welding method, which can fully ensure the welding quality. Several layers of annular distribution coiled pipes 4 are preferably coaxially arranged with the main pipe 31 as the center.

[0046] Further, in the axial direction of the cylinder 1, several layers of distribution coiled pipes 4 are arranged staggeredly, that is, in the axial direction of the cylinder 1, the distribution coiled pipes 4 are stratified, and reference can be made to Figure 3 and Figure 4 The shown structure; a welding space for the heat exchange tubes 21 and the distribution coiled pipes 4 is reserved between adjacent two layers of distribution coiled pipes 4 for convenient welding. Although the height of the heat exchanger is increased to a certain extent, the welding difficulty can be effectively reduced.

[0047] For example, the distribution coil 4 has two layers, namely the first distribution coil 41 and the second distribution coil 42; the first distribution coil 41 and the second distribution coil 42 are coaxially arranged with the main pipe 31 as the center. The first communication hole 32 and the second communication hole 34 are provided on the side wall of the main pipe 31; the second distribution coil 42 is communicated with the second communication hole 34 through the second communication pipe 52, and the first distribution coil 41 is communicated with the first communication hole 32 through the first communication pipe 51; the first distribution coil 41 has a first flow-dividing hole 411 communicating with the heat exchange tube 21, and the second distribution coil 42 has a second flow-dividing hole 421 communicating with the heat exchange tube 21. The shell-side fluid enters the heat exchange tube 21 through the first flow-dividing hole 411 and the second flow-dividing hole 421. The heat exchange tubes 21 of each layer are respectively divided by one layer of the distribution coil 4, with uniform flow division and high consistency; which is conducive to maximizing the efficiency of the heat exchanger.

[0048] The outer diameter of the distribution coil 4 is adapted to the outer diameter of the heat exchange tube layer it communicates with, that is, in the radial direction of the cylinder 1, the outer diameter of the distribution coil 4 communicating with the outer-layer heat exchange tube 21 is larger than the outer diameter of the distribution coil 4 communicating with the inner-layer heat exchange tube 21; thus, the layers of the heat exchange tubes 21 correspond to the layers of the distribution coil 4, which is convenient for tube winding and connection. It should be noted that the outer layer and the inner layer are descriptions of the relative positions of the two layers of heat exchange tubes 21, so neither the outer-layer heat exchange tube 21 nor the inner-layer heat exchange tube 21 refers to a specific layer of heat exchange tubes 21. If the distance between the connection position of the distribution coil 4 and the tube-side nozzle 3 relative to the inner end of the tube-side nozzle 3 is set as the design distance, then for several layers of the distribution coil 4, the design distance of the distribution coil 4 communicating with the outer-layer heat exchange tube 21 is greater than the design distance of the distribution coil 4 communicating with the inner-layer heat exchange tube 21; that is, the connection position of the distribution coil 4 with a larger outer diameter to the main pipe 31 is close to the head 1, and the connection position of the distribution coil 4 with a relatively smaller outer diameter to the main pipe 31 is close to the inner end of the tube-side nozzle 3, and reference can be made to Figure 4 .

[0049] For example, the inner diameter of the second distribution coil 42 is larger than the outer diameter of the first distribution coil 41, exactly corresponding to the outer-layer and inner-layer heat exchange tubes 21 respectively. In the flow direction of the tube-side fluid, the first communication hole 32 is located on the downstream side of the second communication hole 34. The tube-side fluid preferentially passes through the second communication hole 34 and the second communication pipe 52 to enter the second distribution coil 42, and the remaining tube-side fluid then passes through the first communication hole 32 and the first communication pipe 51 to enter the first distribution coil 41; the flow division scheme is reasonable and the uniform distribution effect of the shell-side fluid is good.

[0050] Alternatively, several layers of distributed coiled pipes 4 are in the same plane perpendicular to the axial direction of the cylinder 1 and are in a state of being sleeved in sequence; the outermost distributed coiled pipe 4 communicates with the adjacent inner distributed coiled pipe 4; the innermost distributed coiled pipe 4 communicates with the tube side nozzle 3. The welding difficulty of the heat exchange tubes 21 and the distributed coiled pipes 4 increases, but it can effectively shorten the length of the heat exchange tubes, reduce the height of the equipment, further reduce the equipment material cost, and save valuable equipment installation space for customers. Please refer to Figure 6 , the outermost fourth distributed coiled pipe 44 is sleeved outside the adjacent inner third distributed coiled pipe 43; the fourth distributed coiled pipe 44 communicates with the third distributed coiled pipe 43 through the fourth communication pipe 54; the innermost third distributed coiled pipe 43 communicates with the tube side nozzle 3 through the third communication pipe 53.

[0051] Please refer to Figure 7 and Figure 8 , as another embodiment of the fluid distribution structure, the fluid distribution structure can adopt a spherical head 6. The spherical head 6 has a spherical flow distribution cavity 62 inside, and the flow distribution cavity 62 has a tube side fluid inlet 63 locally; the main pipe 31 is located inside the tube side fluid inlet 63 and communicates with the flow distribution cavity 62. As a communication embodiment of the main pipe 31 and the flow distribution cavity 62, the inner end of the main pipe 31 is open, and the tube side fluid directly flows into the flow distribution cavity 62 through the inner end of the main pipe 31. At this time, the inner end of the main pipe 31 does not need to extend into the flow distribution cavity 62; according to needs, it can also be designed that the main pipe 31 extends into the flow distribution cavity 62, the side wall of the main pipe 31 is open, and the inner end is blocked, and the tube side fluid flows into the flow distribution cavity 62 through the opening at the side wall of the main pipe 31.

[0052] A plurality of layers of third flow distribution holes 61 are provided on the side wall of the flow distribution cavity 62. Each layer of third flow distribution holes 61 corresponds to one layer of heat exchange tubes 21, and each third flow distribution hole 61 corresponds to and communicates with one heat exchange tube 21. Each layer of third flow distribution holes 61 is in the same cross-section of the spherical head 6, and this cross-section is circular; the plurality of cross-sections where the plurality of layers of third flow distribution holes 61 are located are parallel to each other, and the diameter of the cross-section where the third flow distribution holes 61 communicating with the outer layer of heat exchange tubes 21 are located is larger than the diameter of the cross-section where the third flow distribution holes 61 communicating with the inner layer of heat exchange tubes 21 are located. The layers of the heat exchange tubes 21 correspond to the layers of each layer of third flow distribution holes 61, which is convenient for tube winding and connection. Preferably, the cross-section where each layer of third flow distribution holes 61 is located is perpendicular to the flow direction of the tube side fluid, which is beneficial to improving the consistency of the flow distribution of each layer of third flow distribution holes 61.

[0053] The spherical head 6 has pressure resistance and uniform material distribution, reducing the metal consumption of the equipment. The distributed coiled pipes 4 and the wound tube bundle 2 can be fixed to the inner wall of the cylinder 1 through tie bars to enhance the stability of the wound tube bundle 2.

[0054] Practical applications have verified that the above-mentioned heat exchanger application of the fluid distribution structure combined with the tube side nozzle 3 has obvious effects in reducing the height of the equipment and reducing the welding materials.

[0055] The above are only the preferred embodiments of the present utility model and are not intended to limit the present utility model. For those skilled in the art, various modifications and variations can be made to the present utility model. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. A wound tube heat exchanger, comprising a cylinder body (1) and a wound tube bundle (2), wherein both ends of the cylinder body (1) are provided with end heads (11); characterized in that, The wound tube bundle (2) is located inside the cylinder body (1) and has several layers of heat exchange tubes (21); A tube side nozzle (3) is provided on the head (11), and the tube side nozzle (3) is communicated with a fluid distribution structure, and the fluid distribution structure respectively conveys tube side fluid to each layer of the heat exchange tubes (21).

2. The spiral tube heat exchanger according to claim 1, characterized in that, The fluid distribution structure includes several layers of annular distribution coiled pipes (4), and each layer of the distribution coiled pipes (4) corresponds to one layer of the heat exchange tubes (21); the distribution coiled pipes (4) are communicated with the heat exchange tubes (21) and the tube side nozzle (3).

3. The shell-and-tube heat exchanger according to claim 2, characterized in that, The distribution coiled pipes (4) and the heat exchange tubes (21) are fixedly and sealedly connected by an internal hole welding method; and / or, several layers of the distribution coiled pipes (4) are coaxially arranged with the tube side nozzle (3); and / or, the distribution coiled pipes (4) are circular pipes.

4. The shell-and-tube heat exchanger according to claim 2, characterized in that, In the axial direction of the cylinder body (1), several layers of the distribution coiled pipes (4) are staggeredly arranged.

5. The shell-and-tube heat exchanger according to claim 4, wherein, In the radial direction of the cylinder body (1), the inner diameter of the distribution coiled pipe (4) communicated with the outer layer of the heat exchange tubes (21) is larger than the outer diameter of the distribution coiled pipe (4) communicated with the inner layer of the heat exchange tubes (21); the designed distance of the distribution coiled pipe (4) communicated with the outer layer of the heat exchange tubes (21) is larger than the designed distance of the distribution coiled pipe (4) communicated with the inner layer of the heat exchange tubes (21).

6. The shell-and-tube heat exchanger according to claim 2, wherein, Several layers of the distribution coiled pipes (4) are in the same plane perpendicular to the axial direction of the cylinder body (1) and are sleeved in sequence.

7. The shell-and-tube heat exchanger according to claim 6, wherein, The distribution coiled pipe (4) located on the outer side is communicated with the adjacent inner distribution coiled pipe (4); the innermost distribution coiled pipe (4) is communicated with the tube side nozzle (3).

8. A wound tube heat exchanger according to claim 1, characterized in that, The fluid distribution structure includes a spherical head (6), and a spherical flow dividing cavity (62) is arranged inside the spherical head (6), and the flow dividing cavity (62) is communicated with the tube side nozzle (3); several layers of third flow dividing holes (61) are arranged on the side wall of the flow dividing cavity (62) in sequence in the axial direction of the tube side nozzle (3); each layer of the third flow dividing holes (61) corresponds to and is communicated with one layer of the heat exchange tubes (21).

9. The coiled tube heat exchanger according to claim 8, characterized in that, The diameter of the cross section where the third flow dividing hole (61) communicated with the outer layer of the heat exchange tubes (21) is located is larger than the diameter of the cross section where the third flow dividing hole (61) communicated with the inner layer of the heat exchange tubes (21) is located.

10. A wound-tube heat exchanger according to claim 1, characterized in that, Supports are arranged on the outer wall of the cylinder body (1); and / or, a flange (35) is provided at the outer end of the tube side nozzle (3); and / or, the inner end of the tube side nozzle (3) is blocked, and communication holes are formed on the inner wall of the tube side nozzle (3), and the communication holes are located inside the cylinder body (1) and are communicated with the fluid distribution structure.

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