A wound tube heat exchanger and methanol synthesis reactor

Abstract

The present invention belongs to the technical field of industrial heat exchangers, and provides a wound tube heat exchanger, including a core shaft, a tube sheet, a heat exchange tube bundle, a support bar and a guide block; the heat exchange tube bundle is provided with multiple layers outside the core shaft, and each layer of the heat exchange tube bundle includes multiple heat exchange tubes uniformly distributed along the circumference of the core shaft; multiple support bars for supporting the heat exchange tube bundle are provided on the inner side of each layer of the heat exchange tube bundle, and the length of the support bars along the radial direction of the core shaft is less than the spacing between two adjacent layers of the heat exchange tube bundle; multiple guide blocks are provided at intervals on each support bar, and the guide blocks are used to guide the main heat exchange part so that the main heat exchange part is spiral, and one side of the guide block contacts the main heat exchange part on one heat exchange tube, and the other side does not contact the main heat exchange part on other heat exchange tubes in the same layer of the heat exchange tube bundle. The present invention can reduce the obstruction effect of the support bars and the guide blocks on the flow of the shell-side medium, thereby improving the heat exchange effect of the wound tube heat exchanger.

Description

Technical Field

[0001] The invention relates to the technical field of industrial heat exchangers, and in particular to a wound tube heat exchanger and a methanol synthesis reactor. Background Art

[0002] As a key equipment of the coiled tube water-cooled methanol synthesis reactor, the wound tube heat exchanger can efficiently remove and utilize the huge heat released by the methanol synthesis reaction.

[0003] In the current wound tube heat exchanger, a certain distance is maintained between two adjacent layers of heat exchange tubes by laying gaskets, and the axial spacing of the heat exchange tubes in the same layer is maintained by gaskets. The size of the gaskets is adapted to the radial spacing between the heat exchange tubes, and the size of the gaskets is adapted to the axial spacing between the heat exchange tubes. In order to meet the process performance requirements of the reactor, the axial or radial distance between the heat exchange tubes needs to be adaptively adjusted. When the axial or radial distance between the heat exchange tubes needs to be increased, the size of the gaskets or gaskets must also be increased accordingly. However, the increase in the size of the gaskets or gaskets will hinder the flow of the shell-side medium, thereby reducing the shell-side medium flow rate, thereby reducing the heat exchange effect of the wound tube heat exchanger. Summary of the invention

[0004] In view of the defects in the prior art, an object of the present invention is to provide a wound tube heat exchanger to solve or at least alleviate one or more of the above-mentioned technical problems or other problems in the prior art.

[0005] In a first aspect, the present invention provides a wound tube heat exchanger, comprising a core shaft, a tube sheet, a heat exchange tube bundle, a support bar and a guide block; two tube sheets are arranged opposite to each other and are respectively fixed at two ends of the core shaft; the heat exchange tube bundle is arranged in multiple layers outside the core shaft, each layer of the heat exchange tube bundle comprises multiple heat exchange tubes uniformly distributed along the circumference of the core shaft, and each heat exchange tube comprises a main heat exchange portion wound in a spiral; the two ends of the support bar are respectively connected to two tube sheets, and multiple support bars for supporting the heat exchange tube bundle are arranged on the inner side of each layer of the heat exchange tube bundle, and the length of the support bar along the radial direction of the core shaft is less than the spacing between two adjacent layers of the heat exchange tube bundle; multiple guide blocks are arranged at intervals on each support bar, and the guide blocks are used to guide the main heat exchange portion so that the main heat exchange portion is spiral, and one side of the guide block contacts the main heat exchange portion on one heat exchange tube, and the other side does not contact the main heat exchange portion on other heat exchange tubes in the same layer of the heat exchange tube bundle.

[0006] Furthermore, the support bar is provided with a first slide groove extending along the length direction, and the guide block is slidably arranged in the first slide groove; and also includes a locking structure for locking the sliding of the guide block.

[0007] Further, the locking structure includes: a positioning groove, a plurality of which are continuously arranged on the support bar along the length direction of the support bar; a positioning block, which has a protruding positioning portion that is adapted to the positioning groove and can be close to or away from the positioning groove; a socket, which is arranged on the guide block and extends a certain length from the end surface of one end of the guide block to the other end; a ratchet plate, one end of which is connected to the positioning block and the other end of which can be inserted into the socket; and an elastic pawl, one end of which is connected to the guide block and the other end of which can cooperate with the ratchet plate inserted into the socket.

[0008] Furthermore, a receiving groove for installing the elastic pawl is provided on the guide block, the receiving groove is communicated with the insertion hole, and one end of the elastic pawl is fixedly connected to one end of the receiving groove.

[0009] Furthermore, it also includes a limit block movably arranged on the guide block, the limit block can abut against the elastic pawl, and the limit block can be moved to a working position so that the elastic pawl and the ratchet plate remain matched.

[0010] Furthermore, a second slide groove is respectively arranged on two opposite groove walls of the accommodating groove, a guide rod is arranged in the second slide groove, two ends of the limit block are located in the two second slide grooves and are respectively slidably connected to one of the guide rods, a first compression spring is sleeved on the guide rod, and two ends of the first compression spring are respectively abutted against the limit block and the second slide groove.

[0011] Furthermore, the one end of the elastic pawl is connected to the guide block via a first bolt.

[0012] Furthermore, a plurality of threaded holes distributed in the radial direction are arranged at intervals on the tube sheet, and the support bar is fixedly connected to the tube sheet by a second bolt which can be inserted into the threaded hole.

[0013] Furthermore, the support bar includes: a cylinder, one end of which is connected to one of the tube sheets; a rod, one end of which is connected to the other tube sheet and the other end is slidably inserted into the cylinder; and a second compression spring, which is arranged in the cylinder and has two ends respectively abutting against the cylinder and the rod.

[0014] In a second aspect, the present invention further provides a methanol synthesis tower, comprising the wound tube heat exchanger described in any one of the above items.

[0015] Beneficial effects of the present invention: The present invention provides a wound tube heat exchanger and a methanol synthesis reactor, in which the two ends of the support bar are fixed on two tube sheets so that the support bar forms a support for the heat exchange tube bundle, and the guide block is fixed between the tube bodies on two adjacent main heat exchange parts without completely blocking the space. Such an arrangement reduces the obstruction effect of the support bar and the guide block on the flow of the shell-side medium, thereby improving the heat exchange effect of the wound tube heat exchanger. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following is a brief introduction to the drawings required for the specific embodiments or the description of the prior art. In all the drawings, similar elements or parts are generally identified by similar reference numerals. In the drawings, the elements or parts are not necessarily drawn according to the actual scale.

[0017] Figure 1 A three-dimensional diagram of a wound tube heat exchanger provided in one embodiment of the present invention;

[0018] Figure 2 for Figure 1 A magnified schematic diagram of part A in FIG.

[0019] Figure 3 A three-dimensional diagram of a heat exchange tube provided in one embodiment of the present invention;

[0020] Figure 4 A three-dimensional view of a support bar, a guide block and a locking structure at a viewing angle provided by an embodiment of the present invention;

[0021] Figure 5 A three-dimensional view of a support bar, a guide block and a locking structure provided in another perspective according to an embodiment of the present invention;

[0022] Figure 6 A three-dimensional diagram of a positioning block and a ratchet plate in a locking structure provided in one embodiment of the present invention;

[0023] Figure 7 for Figure 4 a longitudinal cross-sectional view of;

[0024] Figure 8 A schematic diagram of the structure of a support bar provided in one embodiment of the present invention;

[0025] Fig. 9 A schematic structural diagram of another arrangement of guide blocks on a support bar provided in one embodiment of the present invention;

[0026] Reference numerals:

[0027] 10. Mandrel;

[0028] 20. Tube sheet; 21. Threaded hole;

[0029] 31. Main heat exchange part; 32. Secondary heat exchange part;

[0030] 40. support bar; 41. first slide slot; 42. connection block; 43. second bolt; 44. cylinder; 45. rod; 46. second compression spring;

[0031] 50. guide block; 51. receiving groove; 52. second slide groove; 53. guide rod; 54. limit block; 55. first compression spring;

[0032] 61. Positioning groove; 62. Positioning block; 621. Positioning portion; 63. Insertion hole; 64. Ratchet plate; 65. Elastic pawl; 66. First bolt. DETAILED DESCRIPTION

[0033] The following embodiments of the technical solution of the present invention are described in detail in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present invention, and are therefore only used as examples, and cannot be used to limit the protection scope of the present invention.

[0034] It should be noted that, unless otherwise specified, the technical terms or scientific terms used in this application should have the common meanings understood by those skilled in the art to which the present invention belongs.

[0035] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0036] In addition, the terms "first", "second", etc. are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. In the description of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0037] In this application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like 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 or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0038] In the present application, unless otherwise clearly specified and limited, a first feature being “above” or “below” a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being “above”, “above”, and “above” a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being “below”, “below”, and “below” a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0039] like Figure 1-9 As shown, this embodiment provides a wound tube heat exchanger, including a shell (not shown in the drawings), a core shaft 10, a tube sheet 20, a heat exchange tube bundle, a support bar 40 and a guide block 50.

[0040] The tube sheet 20 is fixed in the shell and two tube sheets are arranged opposite to each other. The two tube sheets 20 are respectively fixed at the two ends of the core shaft 10. A multi-layer heat exchange tube bundle is arranged outside the core shaft 10. The multi-layer heat exchange tube bundle is distributed along the radial direction of the core shaft 10. Each layer of the heat exchange tube bundle includes a plurality of heat exchange tubes uniformly distributed along the circumference of the core shaft 10. The pitch, spiral radius and spiral direction of the heat exchange tubes in the same layer are the same, and the spiral directions of the heat exchange tubes in the two adjacent layers of the heat exchange tube bundle are opposite. Each heat exchange tube includes a main heat exchange part 31 wound in a spiral and two secondary heat exchange parts 32 respectively connected to the two ends of the main heat exchange part 31. The secondary heat exchange part 32 extends along the axial direction of the core shaft 10. One end of the secondary heat exchange part 32 passes through the tube sheet 20 and is fixedly connected to the tube sheet 20.

[0041] The two ends of the support bar 40 are fixedly connected to the two tube sheets 20 respectively, and a plurality of support bars 40 for supporting the heat exchange tube bundle are arranged on the inner side of each layer of the heat exchange tube bundle, and the support bar 40 provides support for the heat exchange tube bundle in the radial direction of the core shaft 10. The length of the support bar 40 along the radial direction of the core shaft 10 is less than the spacing between two adjacent layers of the heat exchange tube bundle, so the support bar 40 does not block the space between two adjacent layers of the heat exchange tube bundle in the radial direction of the core shaft 10.

[0042] On each support bar 40, a plurality of guide blocks 50 are arranged at intervals along the length direction of the support bar 40 (i.e., the axial direction of the core shaft 10). The guide blocks 50 are used to guide the main heat exchange part 31 so that the main heat exchange part 31 is spiral. Assuming that a main heat exchange part 31 has N turns and a layer of heat exchange tube bundle has M heat exchange tubes, the number of guide blocks 50 on a support bar 40 is usually N*M, where N and M are both positive integers greater than 1. Of course, depending on the different distribution positions of the support bar 40 in the circumferential direction of the core shaft 10, the number of guide blocks 50 on a support bar 40 may also be N*M+1. One side of each guide block 50 contacts the main heat exchange part 31 on a heat exchange tube, and the other side does not contact the main heat exchange part 31 on other heat exchange tubes in the same layer of heat exchange tube bundle, so that the guide block 50 does not block the space between the tube bodies on adjacent main heat exchange parts 31 in the axial direction of the core shaft 10.

[0043] In this embodiment, the two ends of the support bar 40 are fixed on the two tube sheets 20 so that the support bar 40 supports the heat exchange tube bundle, and the guide block 50 is fixed between the tube bodies on two adjacent main heat exchange parts 31 without completely blocking the space. Such an arrangement can reduce the obstruction effect of the support bar 40 and the guide block 50 on the flow of the shell-side medium, thereby improving the heat exchange effect of the wound tube heat exchanger.

[0044] In one embodiment, a first slide groove 41 extending in the length direction is provided on the support bar 40, and the first slide groove 41 may penetrate the support bar 40 in the length direction, and the guide block 50 is slidably disposed in the first slide groove 41. Since there are multiple guide blocks 50 on one support bar 40, the multiple guide blocks 50 are all slidably disposed in the first slide groove 41. At the same time, the wound tube heat exchanger in this embodiment also includes a locking structure for locking the sliding of the guide block 50. In this embodiment, the position of the guide block 50 is adjusted by sliding, and locked by the locking structure, so that the position of the guide block 50 can be flexibly adjusted according to the process performance requirements of the reactor.

[0045] In one embodiment, the locking structure includes a positioning groove 61, a positioning block 62, a socket 63, a ratchet plate 64 and an elastic pawl 65. Among them, a plurality of positioning grooves 61 are continuously arranged on the support bar 40 along the length direction of the support bar 40, and the positioning block 62 has a protruding positioning portion 621 adapted to the above positioning groove 61. The positioning block 62 is movable and can approach or move away from the positioning groove 61. When the positioning block 62 approaches the positioning groove 61, the positioning portion 621 on the positioning block 62 can move to the corresponding positioning groove 61. The socket 63 is arranged on the guide block 50, and extends a certain length from the end surface of one end of the guide block 50 to the other end, and can completely penetrate the guide block 50. One end of the ratchet plate 64 is fixedly connected to the positioning block 62, and the other end can be inserted into the socket 63. The ratchet plate 64 can only move back and forth along the length direction of the socket 63 in the socket 63, and cannot rotate along the circumference of the socket 63 in the socket 63. One end of the elastic pawl 65 is fixedly connected to the guide block 50, and the other end is located in the insertion hole 63 and can cooperate with the ratchet plate 64 inserted into the insertion hole 63, thereby forming a unidirectional moving structure. The elastic pawl 65 can be installed in the insertion hole 63 as a whole, or a part of the structure can be located in the insertion hole 63.

[0046] In this embodiment, after the guide block 50 is moved to the corresponding position, the ratchet plate 64 is inserted into the insertion hole 63, and the elastic pawl 65 cooperates with the ratchet plate 64 to prevent the ratchet plate 64 from withdrawing from the insertion hole 63. In this process, the ratchet plate 64 brings the positioning block 62 to approach the positioning groove 61, so that the positioning portion 621 on the positioning block 62 moves to the corresponding one or more positioning grooves 61 and forms a fit, so that combined with the sliding connection relationship between the guide block 50 and the support bar 40, the guide block 50 is locked on the support bar 40. The locking structure provided in this embodiment is easy to operate.

[0047] In one embodiment, the guide block 50 is provided with a receiving groove 51 for installing the elastic pawl 65, the receiving groove 51 is communicated with the insertion hole 63, the receiving groove 51 extends from a surface or wall of the guide block 50 to the insertion hole 63, the above-mentioned one end of the elastic pawl 65 is fixedly connected to one end of the receiving groove 51, and the other end of the elastic pawl 65 with the hook portion is a free end and is used to form a transmission match with the ratchet plate 64. Through the above-mentioned arrangement, it is convenient to design the elastic pawl 65 to be hidden.

[0048] In one embodiment, the wound tube heat exchanger further includes a limit block 54 movably arranged on the guide block 50, and the limit block 54 can abut against the elastic pawl 65. According to the movable form of the limit block 54, the limit block 54 can abut against the elastic pawl 65 all the time, or it can abut against the elastic pawl 65 at a certain position or a certain working area. The limit block 54 can be moved to a working position where the elastic pawl 65 and the ratchet plate 64 are kept in cooperation, that is, the limit block 54 can be moved to the above-mentioned other end of the elastic pawl 65 and still abut against the elastic pawl 65. In this embodiment, due to the high working temperature in the shell, the high temperature causes the elastic pawl 65 to expand due to heat, so that it is easy to disengage from the ratchet plate 64, so that the guide block 50 loses its guiding and supporting function for the heat exchange tube, and the spacing between the tube bodies of each circle on the main heat exchange part 31 of the heat exchange tube cannot be guaranteed. The spacing between adjacent tube bodies on the heat exchange tube in the axial direction of the core shaft 10 is unevenly distributed, which will affect the heat exchange efficiency of the heat exchanger. Therefore, by providing the limit block 54 to limit the range of motion of the free end of the elastic pawl 65 , the elastic pawl 65 and the ratchet plate 64 are always in a matching relationship, thereby avoiding the above-mentioned problem.

[0049] In one embodiment, a second slide groove 52 is respectively provided on two opposite groove walls of the accommodating groove 51, a guide rod 53 is fixedly provided in each second slide groove 52, the extension direction of the guide rod 53 is consistent with the extension direction of the second slide groove 52, and a first compression spring 55 is sleeved on each guide rod 53. The two ends of the limit block 54 are located in the two second slide grooves 52 and are respectively slidably connected with a guide rod 53, specifically, the guide rod 53 passes through the limit block 54. The two ends of the first compression spring 55 are respectively in contact with the limit block 54 and the groove wall of the second slide groove 52.

[0050] In this embodiment, in the natural state, the compression spring pushes the limit block 54 to the working position where the elastic pawl 65 and the ratchet plate 64 always maintain a matching relationship. When the fixed position of the guide block 50 on the support bar 40 is not accurate, the limit block 54 can be moved, and then the free end of the elastic pawl 65 can be lifted to disengage the elastic pawl 65 from the ratchet plate 64, and the position of the guide block 50 can be adjusted before locking, which is more convenient to operate.

[0051] In one embodiment, one end of the elastic pawl 65 is connected to the guide block 50 via a first bolt 66, and the detachable connection ensures that the elastic pawl 65 can be separated from the ratchet plate 64 under the specific circumstances specified in the above embodiment.

[0052] In one embodiment, Figure 2As shown, a plurality of threaded holes 21 distributed in the radial direction are arranged at intervals on the tube sheet 20, and the support bar 40 is fixedly connected to the tube sheet 20 by a second bolt 43 that can be inserted into the threaded hole 21. An L-shaped connecting block 42 is arranged on the support bar 40, and the connecting block 42 and the support bar 40 are fixed together by welding or integral connection, and the second bolt 43 passes through the connecting block 42 and is threadedly connected to a corresponding threaded hole 21. Through the above arrangement, the fixing position of the support bar 40 can be changed along the radial direction of the tube sheet 20, so as to adapt to the spacing between adjacent layers of different heat exchange tube bundles.

[0053] In one embodiment, Figure 8 As shown, the support bar 40 includes a cylinder 44, a rod 45 and a second compression spring 46. One end of the cylinder 44 is fixedly connected to one of the tube sheets 20, one end of the rod 45 is fixedly connected to the other tube sheet 20, and the other end of the rod 45 is slidably inserted into the cylinder 44. The second compression spring 46 is arranged in the cylinder 44, and the two ends of the second compression spring 46 are respectively in contact with the cylinder 44 and the rod 45. The length of the rod 45 is slightly smaller than the spacing between the two tube sheets 20, and is greater than the length of the cylinder 44. For example, the ratio of the length of the rod 45 to the length of the cylinder 44 can be greater than or equal to 50. Through the above arrangement, the support bar 40 can be prevented from bending due to thermal expansion, thereby radially outwardly supporting the heat exchange tube, thereby causing the connection between the secondary heat exchange part 32 and the tube sheet 20 at both ends of the heat exchange tube to fail, thereby causing leakage of the heat exchange tube.

[0054] In one embodiment, Fig. 9 As shown, in the spiral direction of the main heat exchange part 31, two adjacent guide blocks 50 are respectively located on both sides of the tube body on the main heat exchange part 31, so that the main heat exchange part 31 can be better guided, and the main heat exchange part 31 can be prevented from expanding and contracting in the direction of the other side due to the limitation of the guide block 50 arranged on one side when it expands and contracts due to heat, which may easily lead to the connection failure between the heat exchange tube and one of the tube sheets 20, and further cause the heat exchange tube to leak.

[0055] In one embodiment, a methanol synthesis reactor is provided, comprising the wound tube heat exchanger provided in any one of the above embodiments.

[0056] In the description of the present invention, a large number of specific details are described. However, it is understood that embodiments of the present invention can be practiced without these specific details. In some instances, well-known methods, structures and techniques are not shown in detail so as not to obscure the understanding of this description.

[0057] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents. These modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present invention, and they should all be included in the scope of the claims and specification of the present invention.

Claims

1. A wound tube heat exchanger, characterized in that: It comprises a core shaft (10), a tube sheet (20), a heat exchange tube bundle, a support bar (40) and a guide block (50); The tube sheets (20) are arranged in two pieces opposite to each other and are respectively fixed at two ends of the core shaft (10); The heat exchange tube bundle is provided with multiple layers outside the core shaft (10), each layer of the heat exchange tube bundle comprises a plurality of heat exchange tubes (30) uniformly distributed along the circumference of the core shaft (10), and each of the heat exchange tubes (30) comprises a main heat exchange portion (31) wound in a spiral manner; The two ends of the support bar (40) are respectively connected to the two tube sheets (20); a plurality of support bars (40) for supporting the heat exchange tube bundle are arranged on the inner side of each layer of the heat exchange tube bundle; the length of the support bar (40) along the radial direction of the core shaft (10) is less than the spacing between two adjacent layers of the heat exchange tube bundle; The tube sheet (20) is provided with a plurality of threaded holes (21) distributed in a radial direction at intervals, and the support bar (40) is fixedly connected to the tube sheet (20) via a second bolt (43) that can be inserted into the threaded holes (21); The support bar (40) comprises: A cylinder (44) having one end connected to one of the tube sheets (20); A rod body (45), one end of which is connected to the other tube sheet (20), and the other end of which is slidably inserted into the cylinder body (44); and A second compression spring (46) is disposed in the cylinder (44), with two ends respectively abutting against the cylinder (44) and the rod (45); A plurality of guide blocks (50) are arranged at intervals on each of the support bars (40); the guide blocks (50) are used to guide the main heat exchange portion (31) so that the main heat exchange portion (31) is spirally shaped; one side of the guide block (50) is in contact with the main heat exchange portion (31) on one of the heat exchange tubes (30), and the other side is not in contact with the main heat exchange portions (31) on other heat exchange tubes (30) in the same layer of the heat exchange tube bundle; in the spiral direction of the main heat exchange portion (31), two adjacent guide blocks (50) are respectively located on both sides of the tube body on the main heat exchange portion (31); The support bar (40) is provided with a first slide groove (41) extending along the length direction, and the guide block (50) is slidably arranged in the first slide groove (41); It also comprises a locking structure for locking the sliding movement of the guide block (50).

2. The wound tube heat exchanger according to claim 1, characterized in that: The locking structure comprises: A plurality of positioning grooves (61) are continuously arranged on the support bar (40) along the length direction of the support bar (40); A positioning block (62) having a protruding positioning portion (621) adapted to the positioning groove (61) and capable of being moved closer to or farther from the positioning groove (61); A plug hole (63) is provided on the guide block (50) and extends a certain length from an end surface of one end of the guide block (50) to the other end; a ratchet plate (64), one end of which is connected to the positioning block (62) and the other end of which can be inserted into the insertion hole (63); and An elastic pawl (65) has one end connected to the guide block (50) and the other end capable of cooperating with a ratchet plate (64) inserted into the insertion hole (63).

3. The wound tube heat exchanger according to claim 2, characterized in that: The guide block (50) is provided with a receiving groove (51) for mounting the elastic pawl (65); the receiving groove (51) is communicated with the insertion hole (63); and one end of the elastic pawl (65) is fixedly connected to one end of the receiving groove (51).

4. The wound tube heat exchanger according to claim 3, characterized in that: It also includes a limit block (54) movably arranged on the guide block (50), the limit block (54) being capable of abutting against the elastic pawl (65), and the limit block (54) being capable of moving to a working position in which the elastic pawl (65) and the ratchet plate (64) are kept in cooperation.

5. The wound tube heat exchanger according to claim 4, characterized in that: A second slide groove (52) is respectively arranged on two opposite groove walls of the accommodating groove (51), a guide rod (53) is arranged in the second slide groove (52), two ends of the limit block (54) are located in the two second slide grooves (52) and are respectively slidably connected to one of the guide rods (53), a first compression spring (55) is sleeved on the guide rod (53), and two ends of the first compression spring (55) are respectively in contact with the limit block (54) and the second slide groove (52).

6. The wound tube heat exchanger according to any one of claims 3 to 5, characterized in that: The one end of the elastic pawl (65) is connected to the guide block (50) via a first bolt (66).

7. A methanol synthesis reactor, characterized in that: It comprises a wound tube heat exchanger as described in any one of claims 1 to 6.

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