Compact winding pipe heat exchanger

Abstract

A compact type winding pipe heat exchanger comprises a shell pass cylinder, a winding pipe, a winding pipe and a winding pipe, the two tube plates are respectively arranged at the upper end and the lower end of the shell pass cylinder; the central cylinder is vertically arranged in the shell pass cylinder; the heat exchange tubes are arranged in the shell pass barrel, and the two ends of each heat exchange tube are supported on the corresponding tube plates respectively; the two tube boxes are provided with tube pass connecting tubes and are respectively arranged on the corresponding tube plates; the lower portion of the center cylinder is hollow to form a first channel with the bottom open, and a first through hole is formed in the side wall of the first channel so as to communicate the first channel with the inner space of the shell pass cylinder. The upper part of the central cylinder is hollow to form a second channel with an open top; a second through hole is formed in the side wall of the second channel; meanwhile, shell pass connecting pipes are arranged on the two pipe boxes, and the shell pass connecting pipes are communicated with the bottom opening of the corresponding first channel and the top opening of the corresponding second channel through connecting pipes of the shell pass connecting pipes. The axial length of the heat exchanger is reduced while the heat exchange effect is guaranteed.

Description

Technical Field

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

[0002] Existing spiral-wound tube heat exchangers, such as the Chinese invention patent application number CN201910358285.9 entitled "A Spiral-Wound Tube Heat Exchanger for Gas Absorption" (authorization announcement number CN109999619B) and the Chinese utility model patent application number CN202021024668.7 entitled "Anti-corrosion Structure of the Lower Tube Sheet of a Spiral-Wound Tube Heat Exchanger" (authorization announcement number CN212645484U), generally include a shell-side cylinder with shell-side nozzles, tube sheets welded to both ends of the shell-side cylinder, heat exchange tubes spirally wound axially within the shell-side cylinder and supported at both ends on the tube sheets, and tube boxes with tube-side nozzles on each tube sheet. During heat exchange, the shell-side medium enters the shell-side cylinder through the shell-side nozzles and exchanges heat with the tube-side medium inside the heat exchange tubes.

[0003] Currently, in spiral wound tube heat exchangers, the shell-side nozzles used for the inlet and outlet of the shell-side medium are mostly welded to the side wall of the shell-side shell and relatively close to the corresponding tube sheet. However, due to considerations of welding operations and the impact of welding on the heat exchanger's strength, there are requirements for the distance between the shell-side nozzles and the corresponding tube sheet; that is, the distance between them cannot be too small. At the same time, for heat exchange efficiency, the distance between two shell-side nozzles cannot be too small, resulting in a relatively long axial length of the existing shell-side shell and a large overall size of the heat exchanger. Utility Model Content

[0004] The technical problem to be solved by this utility model is to provide a compact wound tube heat exchanger that reduces the axial length of the heat exchanger itself while ensuring the heat exchange effect, in light of the current state of the technology.

[0005] The technical solution adopted by this utility model to solve the above-mentioned technical problems is: a compact wound tube heat exchanger, comprising:

[0006] Shell-side cylindrical body, its axial direction is defined as up and down;

[0007] Two tube sheets are respectively located at the upper and lower ends of the shell-side cylinder;

[0008] The central tube is vertically disposed within the shell-side tube, and both ends of the central tube are respectively constrained to the corresponding tube sheet;

[0009] Multiple heat exchange tubes are arranged in the shell-side cylinder along the vertical direction and spirally wound around the outer circumference of the central cylinder from the inside to the outside to form a multi-layer spiral tube. The two ends of each heat exchange tube are supported on their respective tube sheets.

[0010] Two tube boxes with tube-side connectors are respectively installed on their corresponding tube sheets to connect to the ends of the corresponding heat exchange tubes;

[0011] Its features are:

[0012] The lower part of the central cylinder is hollow to form a first channel with an open bottom. A first through hole is provided on the side wall of the first channel to connect the first channel with the internal space of the shell-side cylinder.

[0013] The upper part of the central cylinder is hollow to form a second channel with an open top. The side wall of the second channel is provided with a second through hole to connect the second channel with the internal space of the shell-side cylinder.

[0014] Meanwhile, both tube boxes are equipped with shell-side connectors, and each shell-side connector is connected to the bottom opening of the corresponding first channel and the top opening of the corresponding second channel through its own connecting pipe.

[0015] In use, the shell-side medium enters the first channel at the bottom of the central cylinder through the shell-side connector on the bottom tube box, and then enters the shell-side cylinder body through the first through hole on the side wall of the first channel. After flowing upward and exchanging heat with the tube-side medium in the heat exchange tubes, it enters the second channel at the top of the central cylinder through the second through hole, and finally exits through the shell-side connector on the top tube box. Throughout the process, the shell-side medium in the shell-side cylinder body and the tube-side medium in the heat exchange tubes can effectively exchange heat. Since the shell-side connector of this invention is located on the tube box, that is, there is no need to leave a position on the side wall of the shell-side cylinder body to install the shell-side connector, the axial length of the shell-side cylinder body itself can be shortened, thereby making the heat exchanger more compact as a whole.

[0016] In this invention, to achieve independent arrangement of the first and second channels, an internally axially continuous central cylinder can be used, with a horizontal baffle placed inside the central cylinder to divide the internal space of the central cylinder into independent first and second channels. Alternatively, a central cylinder with a second and first channel at the top and bottom, while the middle part is a solid structure, can be used.

[0017] Preferably, the tube-side connectors and shell-side connectors on the same tube box are arranged on both sides of the central tube.

[0018] Preferably, the connecting pipe is a bent pipe installed inside the pipe box. This allows the pipe-side medium passing through the pipe-side connector to flow smoothly into the central cylinder.

[0019] In the above scheme, preferably, there are at least two first through holes arranged at intervals along the circumference of the central cylinder; and at least two second through holes arranged at intervals along the circumference of the central cylinder. This allows the shell-side medium to enter the shell-side cylinder uniformly.

[0020] Furthermore, the tube sheet is an annular plate with a central perforation, the perforation allowing the corresponding ends of the central tube to be joined openly. The annular plate has at least two first regions arranged circumferentially, and a second region located between each pair of adjacent first regions. The ends of multiple heat exchange tubes are divided into multiple groups equal to the number of first regions and supported on the tube holes of their respective first regions. The second regions on the tube sheet at the lower end of the central tube correspond to the first through holes, and the second regions on the tube sheet at the upper end of the central tube correspond to the second through holes. This prevents the shell-side medium output from the first or second through holes from impacting the heat exchange tubes.

[0021] Furthermore, the first region is fan-shaped to allow for even distribution of the ends of each group of heat exchange tubes.

[0022] In the above embodiments, preferably, the spiral tube has a spiral section wound around the outer periphery of the central cylinder, a first straight pipe section extending downward from the lower end of the spiral section, and a second straight pipe section extending upward from the upper end of the spiral section, with the lower end of the first straight pipe section and the upper end of the second straight pipe section respectively supported on their respective tube sheets.

[0023] Compared to existing technologies, this invention eliminates the transition section between the spiral section and the straight tube section, resulting in a shorter overall length of the heat exchange tube, making it compatible with heat exchanger structures with shortened axial lengths. Furthermore, the absence of a transition section allows the spirally wound heat exchange tube to be directly supported on the tube sheet as a straight tube section, facilitating assembly between the heat exchange tube ends and the tube sheet.

[0024] Preferably, the diameters of the spiral section, the first straight pipe section, and the second straight pipe section are the same.

[0025] Compared with the prior art, the advantages of this utility model are as follows: By setting a second channel with a second through hole and a first channel with a first through hole in the upper and lower parts of the central cylinder, and setting shell-side pipes on the two tube boxes respectively, each shell-side pipe is connected to the bottom opening of the corresponding first channel and the top opening of the corresponding second channel through its own connecting pipe. In use, the shell-side medium can enter the first channel in the lower part of the central cylinder through the shell-side pipe on the bottom tube box, and then enter the shell-side cylinder body through the first through hole on the side wall of the first channel. After flowing upward and exchanging heat with the tube-side medium in the heat exchange tube, it enters the second channel in the upper part of the central cylinder through the second through hole, and finally exits from the shell-side pipe on the top tube box. In the whole process, the shell-side medium in the shell-side cylinder body and the tube-side medium in the heat exchange tube can effectively exchange heat. Moreover, since the shell-side pipe of this utility model is located on the tube box, that is, there is no need to leave a position on the side wall of the shell-side cylinder body to install the shell-side pipe, so that the axial length of the shell-side cylinder body itself can be shortened, thereby achieving the purpose of making the heat exchanger more compact. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the structure of the wound tube heat exchanger according to an embodiment of the present utility model;

[0027] Figure 2 This is a schematic diagram of the tube sheet structure according to an embodiment of the present utility model. Detailed Implementation

[0028] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments.

[0029] like Figure 1 and 2 As shown, this is a preferred embodiment of a compact wound tube heat exchanger of the present invention. The wound tube heat exchanger includes a shell-side cylinder 1, a tube sheet 2, a central cylinder 3, heat exchange tubes 4, and a tube box 5.

[0030] The shell-side cylinder 1 is set vertically.

[0031] There are two tube sheets 2, welded to the upper and lower ends of the shell-side cylinder 1 respectively. Each tube sheet 2 is an annular plate with a circular perforation 20 in the center. The surface of the annular plate has four first regions 21 arranged circumferentially, and a second region 22 located between each two adjacent first regions 21. Each first region 21 is fan-shaped with a smaller inner side and a larger outer side, and has multiple tube holes 210 evenly distributed on it to support the heat exchange tubes. From the inside to the outside, the number of tube holes 210 gradually increases to make reasonable use of the fan-shaped space of the first region.

[0032] The central cylinder 3 is vertically disposed within the shell-side cylinder 1. The lower part of the central cylinder 3 is hollow, forming a first channel 31 with an open bottom. Four first through holes 311 are evenly spaced along the circumference of the side wall of the first channel 31 to connect the first channel 31 with the internal space of the shell-side cylinder 1. At the same time, the bottom opening of the first channel 31 connects with the perforation 20 on the lower tube sheet. The upper part of the central cylinder 3 is hollow, forming a second channel 32 with an open top. Four second through holes 321 are evenly spaced along the circumference of the side wall of the second channel 32 to connect the second channel 32 with the internal space of the shell-side cylinder 1. At the same time, the top opening of the second channel 32 connects with the perforation 20 on the upper tube sheet. In this embodiment, the second region 22 on the tube sheet 2 located on the lower side of the central cylinder 3 corresponds to each of the first through holes 311, and the second region 22 on the tube sheet 2 located on the upper side of the central cylinder 3 corresponds to each of the second through holes 321, so as to avoid the shell-side medium output from the first or second through holes on the central cylinder 3 directly impacting the heat exchange tubes. Furthermore, the distance between the first through hole 311 and the lower tube sheet is no more than 5 mm, and the distance between the second through hole 321 and the upper tube sheet is no more than 5 mm, to increase the effective heat exchange zone and prevent the shell-side medium from forming a flow dead zone within the shell-side cylinder.

[0033] Multiple heat exchange tubes 4 are vertically arranged inside the shell-side cylinder 1 and spirally wound around the outer circumference of the central cylinder 3 from the inside out to form a multi-layer spiral tube. Each layer of spiral tube has a spiral section 40 wound around the outer circumference of the central cylinder 3, a first straight tube section 41 extending downward from the lower end of the spiral section 40, and a second straight tube section 42 extending upward from the upper end of the spiral section 40. The diameters of the spiral section 40, the first straight tube section 41, and the second straight tube section 42 are the same. The lower end of the first straight tube section 41 of each layer of spiral tube is divided into four groups and supported on the corresponding tube holes 210 in the first region 21 of the lower tube plate. The upper end of the second straight tube section 42 of each layer of spiral tube is divided into four groups and supported on the corresponding tube holes 210 in the first region 21 of the upper tube plate.

[0034] Two tube boxes 5 are respectively installed on their corresponding tube sheets 2 to connect to the ends of the corresponding heat exchange tubes 4. Each tube box 5 is equipped with a tube-side connector 51 for the tube-side medium to enter and exit, and a shell-side connector 52 for the shell-side medium to enter and exit. Each shell-side connector 52 is connected to the bottom opening of the corresponding first channel 31 and the top opening of the corresponding second channel 32 through its respective connecting pipe 53. In this embodiment, the tube-side connector 51 and shell-side connector 52 on the same tube box 5 are arranged on both sides of the central cylinder 3. The connecting pipe 53 is a bent pipe that passes through the tube box 5.

[0035] During heat exchange, the shell-side medium enters the first channel 31 at the bottom of the central cylinder 3 through the shell-side nozzle 52 on the bottom tube box, then enters the shell-side cylinder 1 through the first through hole 311 on the side wall of the first channel 31, flows upward and exchanges heat with the tube-side medium in the heat exchange tubes 4, then enters the second channel 32 at the top of the central cylinder through the second through hole 321, and finally exits from the shell-side nozzle 52 on the top tube box (the flow direction of the shell-side medium is as follows). Figure 1 (As indicated by the arrow in the image), throughout the process, the shell-side medium in the shell-side cylinder 1 and the tube-side medium in the heat exchange tube 4 can effectively exchange heat. Since the shell-side connecting pipe 52 is located on the tube box 5, that is, there is no need to leave a position on the side wall of the shell-side cylinder 1 for installing the shell-side connecting pipe, the axial length of the shell-side cylinder itself can be shortened, thereby making the heat exchanger more compact as a whole.

[0036] Of course, during heat exchange in this embodiment, the shell-side medium can also enter the second channel 32 at the top of the central cylinder through the shell-side connector 52 on the top tube box, and then enter the shell-side cylinder 1 through the second through hole 321 on the side wall of the second channel 32. After flowing downward and exchanging heat with the tube-side medium in the heat exchange tube 4, it enters the first channel 31 at the bottom of the central cylinder through the first through hole 311, and finally exits from the shell-side connector 52 on the bottom tube box. That is, the flow direction of the shell-side medium is the same as that of the tube box. Figure 1 The direction indicated by the middle arrow is opposite.

[0037] In the specification and claims of this utility model, terms indicating direction, such as "upper," "lower," "side," "top," and "bottom," are used to describe various exemplary structural parts and elements of this utility model. However, the use of these terms is merely for the purpose of explanation and is based on the exemplary orientations shown in the accompanying drawings. Since the embodiments disclosed in this utility model can be arranged in different orientations, these terms indicating direction are for illustrative purposes only and should not be regarded as limitations. For example, "upper" and "lower" are not necessarily limited to directions opposite to or consistent with the direction of gravity.

[0038] 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.

Claims

1. A compact wound tube heat exchanger, comprising: Shell side cylinder (1), its axial direction is defined as up and down; Two tube sheets (2) are respectively located at the upper and lower ends of the shell-side cylinder (1); The central cylinder (3) is vertically disposed inside the shell-side cylinder (1), and the two ends of the central cylinder (3) are respectively constrained on the corresponding tube sheet (2); Multiple heat exchange tubes (4) are arranged in the shell-side cylinder (1) in the vertical direction and spirally wound around the outer periphery of the central cylinder (3) from the inside to the outside to form a multi-layer spiral tube. The two ends of each heat exchange tube (4) are respectively supported on their respective tube sheets (2). Two tube boxes (5) with tube side connectors (51) are respectively installed on their respective tube sheets (2) to connect to the ends of the corresponding heat exchange tubes (4); Its features are: The lower part of the central cylinder (3) is hollow to form a first channel (31) with an open bottom. The side wall of the first channel (31) is provided with a first through hole (311) to connect the first channel (31) with the internal space of the shell side cylinder (1). The upper part of the central cylinder (3) is hollow to form a second channel (32) with an open top. The side wall of the second channel (32) is provided with a second through hole (321) to connect the second channel (32) with the internal space of the shell side cylinder (1). Meanwhile, both tube boxes (5) are equipped with shell-side connectors (52), and each shell-side connector (52) is connected to the bottom opening of the corresponding first channel (31) and the top opening of the second channel (32) through its respective connecting pipe (53).

2. The compact wound tube heat exchanger according to claim 1, characterized in that: The tube side connector (51) and shell side connector (52) on the same tube box (5) are arranged on both sides of the central tube (3).

3. The compact wound tube heat exchanger according to claim 2, characterized in that: The connecting pipe (53) is a bent pipe that runs through the pipe box (5).

4. The compact wound tube heat exchanger according to claim 1, characterized in that: There are at least two first through holes (311) arranged at intervals along the circumference of the central cylinder (3); there are at least two second through holes (321) arranged at intervals along the circumference of the central cylinder (3).

5. The compact wound tube heat exchanger according to claim 4, characterized in that: The tube sheet (2) is an annular plate with a central perforation (20). The perforation (20) allows the corresponding end of the central cylinder (3) to be connected openly. The surface of the annular plate has at least two first regions (21) arranged circumferentially, and a second region (22) located between each two adjacent first regions (21). The ends of multiple heat exchange tubes (4) are divided into multiple groups with the same number as the first regions (21) and supported on the tube holes (210) of their respective first regions (21). The second regions (22) on the tube sheet (2) at the lower end of the central cylinder (3) are arranged corresponding to each first through hole (311), and the second regions (22) on the tube sheet (2) at the upper end of the central cylinder (3) are arranged corresponding to each second through hole (321).

6. The compact wound tube heat exchanger according to claim 5, characterized in that: The first region (21) is fan-shaped so that the ends of each group of heat exchange tubes are evenly distributed.

7. The compact wound tube heat exchanger according to any one of claims 1 to 6, characterized in that: The spiral tube has a spiral section (40) wound around the outer periphery of the central cylinder (3), a first straight pipe section (41) extending downward from the lower end of the spiral section (40), and a second straight pipe section (42) extending upward from the upper end of the spiral section (40). The lower end of the first straight pipe section (41) and the upper end of the second straight pipe section (42) are respectively supported on their respective tube sheets (2).

8. The compact wound tube heat exchanger according to claim 7, characterized in that: The diameters of the spiral section (40), the first straight pipe section (41), and the second straight pipe section (42) are the same.

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