Winding pipe type heat exchanger for reforming equipment

Abstract

The utility model relates to a winding pipe type heat exchanger for reforming equipment, which comprises a shell pass cylinder, a gas phase inlet connecting pipe and a gas phase outlet connecting pipe, the heat exchange tubes are arranged in the shell pass cylinder, the lower end of each heat exchange tube is supported on a lower tube plate, and a tube box is arranged on the lower side of the lower tube plate; the lower tube plate is arranged in the lower space of the shell pass cylinder and is positioned above the gas phase inlet connecting tube; the tube box is a cylindrical body extending downwards from the edge of the lower tube plate, and the lower end part of the tube box is supported at the bottom of the shell pass cylinder and is provided with a tube pass connecting tube; an annular cavity with an open upper end and a closed lower end is formed between the side peripheral wall of the tube box and the side wall of the corresponding shell pass cylinder; the annular flow equalizing plate is arranged in the annular cavity and located above the gas phase inlet connecting pipe, and a plurality of flow equalizing holes are distributed in the flow equalizing plate at intervals; the annular spraying pipe is arranged in the annular cavity and located above the flow equalizing plate, the spraying pipe is provided with a liquid phase inlet connecting pipe, and a plurality of spraying holes are distributed in the spraying pipe in the circumferential direction at intervals. The coking risk of the heat exchanger can be reduced.

Description

Technical Field

[0001] This utility model belongs to the field of heat exchanger technology, specifically relating to a wound tube heat exchanger for reforming equipment. Background Technology

[0002] Currently, in reforming equipment, the reaction feed (low temperature) generally flows through the tube side of the heat exchanger, while the reaction discharge (high temperature) flows through the shell side. This is mainly due to the following two considerations:

[0003] First, from the perspective of process calculation, the high-temperature medium flows through the shell side, and under the same heat load, the required heat exchange area is smaller;

[0004] Second, from a structural design perspective, a feed tube path is more conducive to achieving uniform gas and liquid phase distribution.

[0005] However, considering the differences in raw materials used, the high-temperature reaction discharge goes through the shell side, which is prone to coking due to uneven distribution of the shell side medium, and coking is not easy to clean. Utility Model Content

[0006] The technical problem to be solved by this utility model is to provide a wound tube heat exchanger for reforming equipment to reduce the risk of coking, in light of the current state of the technology.

[0007] The technical solution adopted by this utility model to solve the above-mentioned technical problems is as follows: a wound tube heat exchanger for reforming equipment, comprising:

[0008] A vertically arranged shell-side cylinder, wherein the lower side wall of the shell-side cylinder is provided with a gas phase inlet pipe for the input of gas phase medium;

[0009] Multiple heat exchange tubes are vertically arranged inside the shell-side cylinder and spirally wound from the inside out to form a multi-layer spiral tube. The lower end of each heat exchange tube is supported on the lower tube sheet, and a tube box is provided on the lower side of the lower tube sheet.

[0010] Its features are:

[0011] The lower tube sheet is located in the lower space of the shell-side cylinder and above the gas inlet pipe; the tube box is a cylindrical body extending downward from the edge of the lower tube sheet, the lower end of the tube box is supported on the bottom of the shell-side cylinder, and is provided with a tube-side pipe for the tube-side medium to pass through; the side wall of the tube box and the corresponding side wall of the shell-side cylinder form an annular cavity that is open at the top and closed at the bottom.

[0012] It also includes:

[0013] An annular flow equalization plate is disposed circumferentially within the annular cavity and located above the gas phase inlet pipe. The flow equalization plate is provided with a plurality of flow equalization holes for the gas phase medium to pass through.

[0014] An annular spray pipe is arranged circumferentially within the annular cavity and located above the flow equalization plate. The spray pipe is connected to a liquid inlet pipe for supplying liquid phase medium, and multiple spray holes for supplying liquid phase medium to the annular cavity are distributed circumferentially at intervals on the spray pipe.

[0015] The lower tube sheet of this invention adopts an internal structure located in the lower space of the shell-side cylinder. The tube box connected to the lower tube sheet is designed as a cylindrical body extending vertically, forming an annular cavity with an open upper end and a closed lower end between it and the side wall of the shell-side cylinder. The flow equalization plate set in the annular cavity separates the gas phase inlet pipe and the liquid phase inlet pipe. The gas phase medium entering the annular cavity through the gas phase inlet pipe is evenly distributed by the flow equalization plate and then mixes with the liquid phase medium sprayed from the spray holes of the spray pipe. They flow upward together to exchange heat with the heat exchange tubes, so as to achieve full mixing of the shell-side gas and liquid phase media, ensure heat exchange effect, and reduce the risk of coking.

[0016] Preferably, it further includes an annular wall disposed circumferentially within the annular cavity to divide the annular cavity into a circumferentially extending first part and a second part located around the periphery of the first part. The second part has the aforementioned gas phase inlet pipe, and the top of the second part is closed. The first part communicates with the second part, and the top of the first part is open and located below the flow equalization plate. The design of the annular wall enables pre-distribution of the gas phase medium entering from the gas phase inlet pipe.

[0017] To ensure the pre-distribution effect, preferably, the upper end of the annular wall is located above the gas phase inlet pipe and is joined to the side wall of the corresponding shell-side cylinder, and the lower end of the annular wall is located below the gas phase inlet pipe and is joined to the side wall of the corresponding shell-side cylinder. The annular wall has a plurality of first through holes distributed circumferentially to connect the first part and the second part.

[0018] Furthermore, the lower end of the annular wall is joined to the side wall of the corresponding shell-side cylinder through a circumferentially extending bottom wall, and a plurality of second through holes are distributed circumferentially on the bottom wall to connect the first part and the second part.

[0019] The number and size of the first and second through holes can be designed according to the actual flow field conditions.

[0020] To ensure the pre-distribution effect, preferably, the upper end of the annular wall is located above the gas phase inlet pipe and is joined to the side wall of the corresponding shell-side cylinder, and the lower end of the annular wall is located below the gas phase inlet pipe and is spaced apart from the side wall of the corresponding shell-side cylinder, so that the bottom of the second part is open and communicates with the first part.

[0021] That is, the gaseous medium entering the second part from the gas inlet pipe flows downward along the ring wall under the action of the ring wall and enters the first part, realizing the pre-distribution of the gaseous medium, and then flows upward to the flow equalization plate, realizing the redistribution of the gaseous medium.

[0022] Preferably, the annular wall is inclined from top to bottom in a posture close to the tube box. The inclined annular wall can reduce the flow resistance of the gaseous medium and improve the uniform distribution of the gaseous medium.

[0023] Preferably, the spray pipe has an inner ring facing the pipe box and an outer ring facing away from the pipe box, with the number of spray holes on the inner ring being greater than the number of spray holes on the outer ring. This ensures that the liquid medium can be uniformly distributed across the entire cross-section of the shell-side cylinder.

[0024] Because the shell-side cylinder has a large diameter, the flow velocity after gas-liquid mixing is low when the gas flow rate is small, which easily leads to the re-separation of the fully mixed gas and liquid phases. Therefore, to solve this technical problem, preferably, multiple uniform flow holes arranged at intervals form a uniform distribution unit, with at least two sets of such units, arranged circumferentially on the uniform flow plate. The uniform flow plate is provided with multiple vertically extending guide pipes corresponding to the number of uniform distribution units. The lower inlet of each guide pipe is located above the corresponding uniform distribution unit, and the upper inlet of each guide pipe faces the outermost spiral tube. Each guide pipe is connected to the spray holes on the spray pipe through its own connecting pipe. The gas phase passing through the uniform flow plate enters the corresponding guide pipe, mixes with the liquid phase, and then flows upward within the guide pipe to the heat exchange tube. During this process, due to the limited cross-sectional area of ​​the guide pipe, the flow velocity after gas-liquid mixing is guaranteed, thus ensuring sufficient mixing of the two phases.

[0025] Furthermore, the spiral tube has a vertically extending and spirally wound spiral segment, a straight pipe segment located below the spiral segment and extending vertically, and a connecting segment connecting the straight pipe segment and the spiral segment. The diameter of the straight pipe segment is smaller than the diameter of the spiral segment, and the lower end of the straight pipe segment is supported by the lower tube plate.

[0026] The upper end face of the guide tube is an inclined surface adapted to the connecting section, and this inclined surface is spaced opposite to the connecting section of the outermost spiral tube. This allows the gas-phase mixture output from the upper end of the guide tube to flow smoothly to the heat exchange tube for heat exchange.

[0027] To ensure that the liquid medium can enter the guide pipe uniformly, the lower part of the guide pipe is provided with multiple flow holes spaced apart circumferentially, and the multiple flow holes arranged circumferentially form a flow unit. There are multiple sets of flow units, which are arranged at intervals in the vertical direction. The flow holes of two adjacent sets of flow units are staggered in the vertical direction. Each flow hole is connected to the spray hole on the spray pipe through its corresponding connecting pipe.

[0028] Compared with the prior art, the advantages of this utility model are as follows: The lower tube sheet of this utility model adopts an internal structure located in the lower space of the shell-side cylinder. The tube box connected to the lower tube sheet is designed as a cylindrical body extending vertically, forming an annular cavity with an open upper end and a closed lower end between it and the side wall of the shell-side cylinder. The flow equalization plate set in the annular cavity separates the gas phase inlet pipe and the liquid phase inlet pipe. After the gas phase medium entering the annular cavity through the gas phase inlet pipe is evenly distributed by the flow equalization plate, it mixes with the liquid phase medium sprayed from the spray holes of the spray pipe and flows upward together to exchange heat with the heat exchange tube. This achieves full mixing of the shell-side gas and liquid phase media while ensuring the heat exchange effect and reducing the risk of coking. Attached Figure Description

[0029] Figure 1 This is a partial structural cross-sectional view of Embodiment 1 of the present utility model;

[0030] Figure 2 This is a schematic diagram of the structure of the spray pipe according to Embodiment 1 of this utility model;

[0031] Figure 3 for Figure 2 AA section view in the middle;

[0032] Figure 4 This is a cross-sectional view of the guide wall according to Embodiment 1 of this utility model;

[0033] Figure 5 This is a top view of multiple guide walls according to Embodiment 1 of this utility model;

[0034] Figure 6 This is a partial structural cross-sectional view of Embodiment 2 of the present invention;

[0035] Figure 7 This is a partial structural cross-sectional view of Embodiment 3 of this utility model;

[0036] Figure 8 This is a top view of the flow equalization plate according to Embodiment 3 of this utility model;

[0037] Figure 9 This is a schematic diagram of the flow guide tube according to Embodiment 3 of this utility model;

[0038] Figure 10 This is a cross-sectional view of the guide tube in Embodiment 3 of this utility model;

[0039] Figure 11 This is a longitudinal sectional view of a partial structure of the guide tube in Embodiment 3 of this utility model. Detailed Implementation Example 1

[0040] like Figure 1-5As shown, this is a preferred embodiment of a wound tube heat exchanger for a reforming equipment according to the present invention. The wound tube heat exchanger includes a shell-side cylinder 1, heat exchange tubes 2, a lower tube sheet 3, a flow equalization plate 4, a spray pipe 5, and an annular wall 6.

[0041] The shell-side cylinder 1 is vertically arranged. The lower side wall of the shell-side cylinder 1 is provided with a gas phase inlet pipe 11 for the input of the gas phase medium (the upper part of the shell-side cylinder 1 is provided with a shell-side outlet pipe for the output of the shell-side medium; this embodiment only shows the structure of the lower part of the heat exchanger, and the upper part of the heat exchanger is a conventional design, so it is not shown in the figure). At the same time, the side wall of the shell-side cylinder 1 is provided with a manhole 12 for maintenance personnel to enter and exit, and the manhole 12 is located above the gas phase inlet pipe 11.

[0042] Multiple heat exchange tubes 2 are vertically arranged inside the shell-side cylinder 1 and are spirally wound from the inside out to form a multi-layer spiral tube 20. The spiral tube 20 has a vertically extending and spirally wound spiral section 21, a straight tube section 22 located below the spiral section 21 and extending vertically, and a connecting section 23 connecting the straight tube section 22 and the spiral section 21. The diameter of the straight tube section 22 is smaller than the diameter of the spiral section 21, and the lower end of the straight tube section 22 is supported on the lower tube sheet 3. The diameter of the connecting section 23 gradually decreases from top to bottom.

[0043] The lower tube sheet 3 is located in the lower space of the shell-side cylinder 1 and above the gas inlet pipe 11. A tube box 31 is provided on the lower side of the lower tube sheet 3. The tube box 31 is a cylindrical body extending downwards from the edge of the lower tube sheet 3. The lower end of the tube box 31 is supported at the bottom of the shell-side cylinder 1 and is provided with a tube-side pipe 311 for the passage of the tube-side medium. This tube-side pipe 311 is used to connect to external pipelines to allow the tube-side medium to enter the tube box 31, such as... Figure 1 As shown, the tube side connector 311 is partially exposed outside the shell side cylinder 1; an annular cavity 10 with an open upper end and a closed lower end is formed between the side wall of the tube box 31 and the corresponding side wall of the shell side cylinder 1.

[0044] An annular flow equalization plate 4 is circumferentially disposed within the annular cavity 10 and located above the gas phase inlet pipe 11. Multiple flow equalization holes 40 for the passage of the gas phase medium are spaced apart on the flow equalization plate 4. Figure 1 , 4As shown in Figure 5, to eliminate the gap between the flow equalization plate 4 and the side wall of the pipe box 31 after installation, an arc-shaped guide wall 8 is inserted between the flow equalization plate 4 and the side wall of the pipe box 31. Multiple guide walls 8 are arranged circumferentially at intervals to form a ring. Each guide wall 8 has a vertically extending arc-shaped wall 81 and an arc-shaped flange 82 extending horizontally outward from the upper end of the arc-shaped wall 81. The arc-shaped wall 81 is inserted into the gap from top to bottom, and the arc-shaped flange 82 is supported on the inner edge of the flow equalization plate and the two are welded together. This allows the guide wall 8 to perform positioning and sealing functions, preventing the gaseous medium from directly passing through the gap. To further improve the positioning and sealing effect, at least two vertically extending guide plates 811 are provided on the inner side of each arc-shaped wall 81 at intervals along the circumference, and arc-shaped guide strips 83 are inserted between the arc-shaped wall 81 and the side circumferential wall of the pipe box 31. There are multiple guide strips 83, which are arranged at intervals along the circumference above the guide plates 811. Each guide strip 83 and the guide plate 811 form a closed loop to prevent the medium from passing between the arc-shaped wall and the side circumferential wall of the pipe box 31.

[0045] An annular spray pipe 5 is circumferentially disposed within the annular cavity 10 and located above the flow equalization plate 4. The spray pipe 5 is connected to a liquid inlet pipe 51 for supplying liquid phase medium. The liquid inlet pipe 51 is disposed on the side wall of the shell-side cylinder 1 and exposed to allow the liquid phase medium to enter. Furthermore, multiple spray holes 52 are circumferentially distributed on the spray pipe 5 to supply liquid phase medium for output into the annular cavity 10.

[0046] In this embodiment, as Figure 3 As shown, the spray pipe 5 has an inner ring portion 5a facing the pipe box 31 and an outer ring portion 5b facing away from the pipe box 31. The number of spray holes on the inner ring portion 5a is greater than the number of spray holes on the outer ring portion 5b. Furthermore, the top of the spray pipe 5 is provided with a vent 53 for gas discharge, and the bottom of the spray pipe is provided with a drain port 54 for liquid discharge.

[0047] The aforementioned annular wall 6 is circumferentially disposed within the annular cavity 10, dividing the annular cavity 10 into a circumferentially extending first part 101 and a second part 102 located around the first part 101. The second part 102 has the aforementioned gas phase inlet pipe 11, and the top of the second part 102 is closed. The first part 101 communicates with the second part 102, and the top of the first part 101 is open and located below the flow equalization plate 4. Specifically, the annular wall 6 extends vertically, with its upper end located above the gas phase inlet pipe 11 and engaging with the side wall of the corresponding shell-side cylinder 1 through its circumferentially extending top wall. The lower end of the annular wall 6 is located below the gas phase inlet pipe 11 and engaging with the side wall of the corresponding shell-side cylinder 1 through its circumferentially extending bottom wall 62. Multiple first through holes 61 are distributed circumferentially on the annular wall 6, and multiple groups of circumferentially distributed first through holes are arranged at intervals in the vertical direction. Multiple second through holes 621 are circumferentially spaced on the bottom wall 62, and these circumferentially spaced second through holes form a group, with multiple groups arranged radially at intervals. The design of the first and second through holes connects the first part 101 and the second part 102, allowing the gaseous medium entering from the gas inlet pipe 11 to enter the second part 102, and then, after pre-distribution through the first and second through holes, enter the first part 101. The gaseous medium entering the first part 101 flows upward to the flow equalization plate 4 for redistribution. After passing through the flow equalization plate 4, the gaseous medium mixes with the liquid medium sprayed from the spray pipe and flows upward together to the heat exchange pipe for heat exchange, achieving thorough mixing of the gas and liquid phases. Example 2

[0048] like Figure 6 The diagram shows a preferred embodiment of the spiral tube heat exchanger for a reforming equipment according to the present invention. This embodiment is basically the same as the first embodiment, except that in this embodiment, the annular wall 6 is inclined from top to bottom towards the tube box 31. The upper end of the annular wall 6 is located above the gas phase inlet pipe 11 and directly engages with the side wall of the corresponding shell-side cylinder 1. The lower end of the annular wall 6 is located below the gas phase inlet pipe 11 and is spaced apart from the side wall of the corresponding shell-side cylinder 1, so that the bottom of the second part 102 is open and communicates with the first part 101. Example 3

[0049] like Figure 7-11As shown, this is a preferred embodiment three of the spiral tube heat exchanger for reforming equipment according to the present invention. This embodiment is basically the same as the first embodiment, except that in this embodiment, multiple flow equalization holes 40 arranged in a circular array at intervals form a group of equalization units 4a. There are multiple groups of equalization units 4a, which are arranged at intervals along the circumference on the flow equalization plate 4. The flow equalization plate 4 is provided with multiple vertically extending guide pipes 7 corresponding to the number of equalization units 4a. The lower pipe opening of each guide pipe 7 is located above the corresponding equalization unit 4a, and the upper pipe opening of each guide pipe 7 faces the outermost spiral tube 20. Each guide pipe 7 is connected to the spray hole 52 on the spray pipe 5 through its own connecting pipe 70.

[0050] Specifically, the upper end face of the guide tube 7 is an inclined surface 71 adapted to the connecting section 23. The inclined surface 71 is spaced apart from the connecting section 23 of the outermost spiral tube 20. The spacing is designed according to the working conditions to ensure that the fluid after gas-liquid mixing in the guide tube 7 can enter the part where the heat exchange tube is located for heat exchange.

[0051] To ensure that the liquid medium can enter the guide pipe 7 uniformly, the lower part of the guide pipe 7 is provided with multiple flow holes 72 at intervals along the circumference. The multiple flow holes 72 arranged in the circumferential direction form a flow unit. There are multiple flow units, which are arranged at intervals along the vertical direction. The flow holes 72 of two adjacent flow units are staggered in the vertical direction. Each flow hole 72 is connected to the spray hole 52 on the spray pipe 5 through its corresponding connecting pipe 70.

[0052] Furthermore, in this embodiment, such as Figure 11 As shown, each guide tube 7 is composed of at least two tube sections connected vertically. After the other components in the heat exchanger are assembled and the lower tube section of the guide tube 7 is fixed relative to the flow equalization plate 4, the upper tube section can be finally connected to the lower tube section by welding or other means to avoid affecting the working space of personnel in the heat exchanger due to the presence of the upper tube section.

[0053] The term "vertical" is also used in the specification and claims of this utility model, meaning basically along the up and down direction, and is not limited to just the vertical direction, but can also be slightly deviated from the vertical direction.

[0054] The term "radial" is also used in the specification and claims of this utility model, meaning basically along the inside and outside direction, and is not limited to the radial direction that passes through the center of the circle, but can also be slightly deviated from the radial direction.

Claims

1. A coiled tube heat exchanger for reforming apparatus, comprising: a vertically arranged shell side cylinder (1), a lower side wall of the shell side cylinder (1) being provided with a gas phase inlet pipe (11) for input of gas phase medium; a plurality of heat exchange tubes (2) vertically arranged in the shell side cylinder (1) and spirally wound into a plurality of layers of spiral tubes (20) from inside to outside, a lower end of each heat exchange tube (2) being supported on a lower tube plate (3), a lower side of the lower tube plate (3) being provided with a tube box (31); characterized in that: the lower tube plate (3) is arranged in a lower space of the shell side cylinder (1) and above the gas phase inlet pipe (11); the tube box (31) is a cylindrical body extending downward from an edge of the lower tube plate (3), a lower end of the tube box (31) is supported on a bottom of the shell side cylinder (1) and is provided with a tube side pipe (311) for passage of tube side medium; a side peripheral wall of the tube box (31) and a corresponding side wall of the shell side cylinder (1) form an annular cavity (10) with an open upper end and a closed lower end; further comprising: an annular flow equalizing plate (4) arranged in the annular cavity (10) in a peripheral direction and above the gas phase inlet pipe (11), a plurality of flow equalizing holes (40) for passage of gas phase medium being arranged on the flow equalizing plate (4) in a spaced manner; an annular spray pipe (5) arranged in the annular cavity (10) in a peripheral direction and above the flow equalizing plate (4), the spray pipe (5) being connected with a liquid phase inlet pipe (51) for input of liquid phase medium, and a plurality of spray holes (52) for output of liquid phase medium into the annular cavity (10) being arranged on the spray pipe (5) in a spaced manner in a peripheral direction. further comprising an annular wall (6) arranged in the annular cavity (10) in a peripheral direction to divide the annular cavity (10) into a first part (101) extending in a peripheral direction and a second part (102) located at a periphery of the first part (101), the second part (102) being provided with the gas phase inlet pipe (11) and having a closed top part, the first part (101) being in communication with the second part (102) and having an open top part located below the flow equalizing plate (4).

2. The spiral wound heat exchanger of claim 1, wherein: an upper end of the annular wall (6) is located above the gas phase inlet pipe (11) and is engaged with a corresponding side wall of the shell side cylinder (1), a lower end of the annular wall (6) is located below the gas phase inlet pipe (11) and is engaged with a corresponding side wall of the shell side cylinder (1), a plurality of first through holes (61) are arranged on the annular wall (6) in a spaced manner in a peripheral direction to communicate the first part (101) and the second part (102).

3. The spiral wound heat exchanger of claim 2, wherein: the lower end of the annular wall (6) is engaged with a corresponding side wall of the shell side cylinder (1) through a bottom wall (62) extending in a peripheral direction, and a plurality of second through holes (621) are arranged on the bottom wall (62) in a spaced manner in a peripheral direction to communicate the first part (101) and the second part (102).

4. The spiral wound heat exchanger of claim 3, wherein: ​ 5. The spiral wound heat exchanger of claim 2, wherein: The upper end of the ring wall (6) is located above the gas phase inlet connector (11) and is engaged with the sidewall of the corresponding shell side cylinder (1), and the lower end of the ring wall (6) is located below the gas phase inlet connector (11) and is spaced opposite to the sidewall of the corresponding shell side cylinder (1), so that the bottom of the second part (102) is open and communicates with the first part (101).

6. The spiral wound heat exchanger of claim 5, wherein: The ring wall (6) is inclined from top to bottom in a posture close to the tube box (31).

7. The spiral wound heat exchanger of claim 1, wherein: The tube wall of the spray pipe (5) has an inner ring part (5a) facing the tube box (31) and an outer ring part (5b) facing away from the tube box (31), and the number of spray holes on the inner ring part (5a) is greater than the number of spray holes on the outer ring part (5b).

8. The spiral wound heat exchanger according to any one of claims 1 to 7, characterized in that: A plurality of flow-distributing holes (40) arranged at intervals form a flow-distributing unit (4a), and there are at least two groups of flow-distributing units (4a) arranged at intervals in the circumferential direction on the flow-distributing plate (4); the flow-distributing plate (4) is provided with a plurality of flow guide pipes (7) extending vertically in a number corresponding to the number of flow-distributing units (4a), the lower pipe opening of each flow guide pipe (7) is located above the corresponding flow-distributing unit (4a), the upper pipe opening of each flow guide pipe (7) faces the outermost spiral pipe (20), and each flow guide pipe (7) communicates with the spray hole (52) on the spray pipe (5) through a respective connecting pipe (70).

9. The spiral wound heat exchanger of claim 8, wherein: The spiral pipe (20) has a vertically extending and spirally wound spiral section (21), a straight pipe section (22) located on the lower side of the spiral section (21) and vertically extending, and a linking section (23) linking the straight pipe section (22) and the spiral section (21), the diameter of the straight pipe section (22) is smaller than the diameter of the spiral section (21), and the lower end of the straight pipe section (22) is supported on the lower tube plate (3). The upper end surface of the flow guide pipe (7) is a bevel (71) adapted to the linking section (23), and the bevel (71) is spaced opposite to the linking section (23) of the outermost spiral pipe (20).

10. The spiral wound heat exchanger of claim 8, wherein: The lower part of the flow guide pipe (7) is provided with a plurality of flow-through holes (72) arranged at intervals in the circumferential direction, and a plurality of flow-through holes (72) arranged in the circumferential direction form a flow-through unit, there are a plurality of flow-through units arranged at intervals in the up-down direction, and the flow-through holes (72) of two adjacent flow-through units in the up-down direction are staggered in the up-down direction; each flow-through hole (72) communicates with the spray hole (52) on the spray pipe (5) through a respective corresponding connecting pipe (70). The upper end of the ring wall (6) is located above the gas phase inlet connector (11) and is engaged with the sidewall of the corresponding shell side cylinder (1), and the lower end of the ring wall (6) is located below the gas phase inlet connector (11) and is spaced opposite to the sidewall of the corresponding shell side cylinder (1), so that the bottom of the second part (102) is open and communicates with the first part (101). The ring wall (6) is inclined from top to bottom in a posture close to the tube box (31). The tube wall of the spray pipe (5) has an inner ring part (5a) facing the tube box (31) and an outer ring part (5b) facing away from the tube box (31), and the number of spray holes on the inner ring part (5a) is greater than the number of spray holes on the outer ring part (5b). A plurality of flow-distributing holes (40) arranged at intervals form a flow-distributing unit (4a), and there are at least two groups of flow-distributing units (4a) arranged at intervals in the circumferential direction on the flow-distributing plate (4); the flow-distributing plate (4) is provided with a plurality of flow guide pipes (7) extending vertically in a number corresponding to the number of flow-distributing units (4a), the lower pipe opening of each flow guide pipe (7) is located above the corresponding flow-distributing unit (4a), the upper pipe opening of each flow guide pipe (7) faces the outermost spiral pipe (20), and each flow guide pipe (7) communicates with the spray hole (52) on the spray pipe (5) through a respective connecting pipe (70). The spiral pipe (20) has a vertically extending and spirally wound spiral section (21), a straight pipe section (22) located on the lower side of the spiral section (21) and vertically extending, and a linking section (23) linking the straight pipe section (22) and the spiral section (21), the diameter of the straight pipe section (22) is smaller than the diameter of the spiral section (21), and the lower end of the straight pipe section (22) is supported on the lower tube plate (3). The upper end surface of the flow guide pipe (7) is a bevel (71) adapted to the linking section (23), and the bevel (71) is spaced opposite to the linking section (23) of the outermost spiral pipe (20). The lower part of the flow guide pipe (7) is provided with a plurality of flow-through holes (72) arranged at intervals in the circumferential direction, and a plurality of flow-through holes (72) arranged in the circumferential direction form a flow-through unit, there are a plurality of flow-through units arranged at intervals in the up-down direction, and the flow-through holes (72) of two adjacent flow-through units in the up-down direction are staggered in the up-down direction; each flow-through hole (72) communicates with the spray hole (52) on the spray pipe (5) through a respective corresponding connecting pipe (70).

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