Spiral wound tube type heat exchanger

Abstract

The utility model discloses a spiral wound tube type heat exchanger which comprises a shell, a heat exchange tube bundle is arranged in the shell, a heat exchange cavity is arranged between the shell and the heat exchange tube bundle, the shell is provided with a first liquid inlet and a first liquid outlet, the heat exchange tube bundle is divided into a plurality of heat exchange tube sets, and the heat exchange tube sets are independently communicated with the first liquid inlet and the first liquid outlet. At least partial areas of the heat exchange tube sets spirally surround the axis of the shell to form spiral sections, the spiral sections of the different heat exchange tube sets are arranged in the axial direction of the shell at intervals, and the multiple spiral sections work independently to conduct heat exchange on media in the heat exchange cavity. The spiral sections of the different heat exchange tube sets are arranged in the axial direction of the shell at intervals, the heat exchange cavity is divided into a plurality of heat exchange areas in the axial direction, and the spiral sections in each heat exchange area work independently and conduct heat exchange on media in the heat exchange areas. A high temperature difference between a tube pass medium flowing to the spiral section and a shell pass medium in the heat exchange cavity is maintained, and the heat exchange rate is increased.

Description

Technical Field

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

[0002] Spiral coil heat exchangers are devices used to transfer heat from hot fluids to cold fluids to meet specified process requirements. They are an industrial application of convective heat transfer and heat conduction, and play an important role in general production in chemical, petroleum, power, food and many other industrial sectors.

[0003] A spiral wound tube heat exchanger typically consists of a heat exchange tube bundle and a shell. One medium (tube-side medium) flows inside the heat exchange tube bundle, while another medium (shell-side medium) flows in the shell space outside the heat exchange tube bundle. The two media exchange heat through the walls of the heat exchange tube bundle. The spiral extension of the heat exchange tube bundle within the shell increases the heat exchange area between the shell-side and tube-side media, thereby improving heat exchange efficiency.

[0004] The shell has an inlet and an outlet connecting the heat exchange tube bundle. Inside the shell, the heat exchange tube bundle extends spirally from the inlet to the outlet. The entire length of the heat exchange tube bundle participates in heat exchange with the shell-side medium within the shell space, resulting in a relatively long heat exchange distance between the tube bundle and the shell-side medium. However, after the tube-side medium flows into the heat exchange tube bundle from the inlet, it gradually exchanges heat with the shell-side medium. After flowing to the outlet side, the temperature of the tube-side medium and the temperature of the shell-side medium in the shell space tend to be the same, and the temperature difference between the two media becomes smaller. This reduces the heat exchange effect on the shell-side medium within the shell space, leading to a decrease in the heat exchange efficiency of the spiral wound tube heat exchanger. Utility Model Content

[0005] This invention provides a spiral wound tube heat exchanger to solve the problem of poor heat exchange effect and low heat exchange efficiency caused by the small temperature difference between the tube-side medium and the shell-side medium in the heat exchange area of ​​the shell part.

[0006] The technical solution adopted in this utility model is as follows:

[0007] A spiral wound tube heat exchanger includes a shell, a heat exchange tube bundle inside the shell, a heat exchange cavity between the shell and the heat exchange tube bundle, a first liquid inlet and a first liquid outlet communicating with the heat exchange tube bundle, the heat exchange tube bundle being divided into multiple heat exchange tube groups, each heat exchange tube group being independently connected to the first liquid inlet and the first liquid outlet, at least a portion of each heat exchange tube group spirally wound around the axis of the shell to form a spiral segment, the spiral segments of different heat exchange tube groups being spaced apart along the axial direction of the shell, and the multiple spiral segments operating independently to exchange heat with the medium in the heat exchange cavity respectively.

[0008] The spiral wound tube heat exchanger of this utility model also has the following additional technical features:

[0009] The heat exchange tube assembly has an inlet section located upstream of the spiral section and connected to the first liquid inlet, and an outlet section located downstream of the spiral section and connected to the first liquid outlet. The inlet section and the outlet section are straight pipes.

[0010] The housing is provided with a first isolation plate and a second isolation plate. The first isolation plate and the housing cooperate to form a first isolation chamber, and the second isolation plate and the housing cooperate to form a second isolation chamber. The liquid inlet section is located in the first isolation chamber, and the liquid outlet section is located in the second isolation chamber.

[0011] The first isolation chamber is isolated from the second isolation chamber. The first isolation chamber can contain the medium, and the medium inside the first isolation chamber is the same as the medium flowing into the first inlet.

[0012] The spiral wound tube heat exchanger is provided with a liquid inlet tube plate at the liquid inlet end of the heat exchange tube bundle. A liquid inlet cavity is formed between the liquid inlet tube plate and the first liquid inlet. The liquid inlet tube plate is provided with a plurality of connecting holes that connect to the heat exchange tube bundle so that the first liquid inlet is connected to the heat exchange tube bundle.

[0013] A guide groove is provided on the side of the liquid inlet tube plate facing the liquid inlet chamber. The guide groove extends spirally to form a liquid inlet channel. A plurality of the connecting holes are arranged at intervals in the extension direction of the liquid inlet channel. The first liquid inlet is connected to the liquid inlet channel.

[0014] The connecting holes are connected to each of the heat exchange tube groups in a one-to-one correspondence, and the heat exchange tube groups connected to adjacent connecting holes are different.

[0015] The spiral segment spirals around the axis of the shell, and the spiraling directions of adjacent spiral segments are opposite.

[0016] The heat exchange cavity is provided with multiple flow baffles, which are located between adjacent spiral sections. Each flow baffle is a complete flat plate structure, and there is a flow gap between the flow baffle and the inner wall of the heat exchange cavity. Adjacent flow gaps are staggered.

[0017] The flow velocity of the medium inside the heat exchange tube assembly is greater than the flow velocity of the medium inside the heat exchange cavity.

[0018] Due to the adoption of the above technical solution, the beneficial effects achieved by this utility model are as follows:

[0019] 1. In this invention, the shell-side medium in the heat exchange cavity and the tube-side medium in the heat exchange tube bundle exchange heat through the sidewall of the heat exchange tube bundle, so that the shell-side medium in the heat exchange cavity reaches a suitable temperature. At least a portion of the heat exchange tube bundle spirally surrounds the axis of the shell to form a spiral segment. The spiral segment increases the heat exchange area between the shell-side medium and the tube-side medium, improving the heat exchange efficiency. Moreover, the spiral segment is circumferentially uniformly distributed in the heat exchange cavity, and the shell-side medium in contact with the spiral segment is circumferentially uniformly distributed in the heat exchange cavity, improving the uniformity of heat exchange between the tube-side medium and the shell-side medium. In addition, when the shell-side medium flows in the heat exchange cavity, it is blocked by the spiral segment, which slows down the flow speed and increases the heat exchange time. Guided by the spiral segment, part of the shell-side medium generates a spiral flow along the spiral segment, further increasing the uniformity of heat exchange.

[0020] Based on this, different heat exchange tube assemblies are independently connected to the first liquid inlet and the first liquid outlet. The spiral segments of the different heat exchange tube assemblies are arranged at intervals along the axial direction of the shell, dividing the heat exchange cavity into multiple heat exchange zones along the axial direction. Within each heat exchange zone, the spiral segments operate independently, exchanging heat with the medium in that zone. The multiple spiral segments are independently connected to the first liquid inlet and the first liquid outlet, exchanging heat with the medium in the heat exchange cavity through the spiral segments. This maintains a high temperature difference between the tube-side medium flowing to the spiral segments and the shell-side medium in the heat exchange cavity, improving the heat exchange rate. The shell-side medium in the heat exchange cavity flows sequentially through multiple heat exchange zones, all of which can undergo rapid heat exchange, allowing the shell-side medium in the heat exchange cavity to reach a suitable temperature in a short time, thus improving the heat exchange efficiency of the spiral wound tube heat exchanger.

[0021] 2. In a preferred embodiment of this utility model, the heat exchange tube assembly has an inlet section located upstream of the spiral section and communicating with the first liquid inlet, and an outlet section located downstream of the spiral section and communicating with the first liquid outlet. Both the inlet and outlet sections are straight pipes. The straight pipe design of the inlet and outlet sections reduces the area of ​​heat exchange between the tube-side medium and the outside through the pipe wall of the inlet section. Furthermore, the tube-side medium has a faster flow velocity within the straight pipe, allowing it to flow quickly to the spiral section and maintaining a larger temperature difference between the tube-side medium and the shell-side medium in the heat exchange chamber, thereby achieving rapid heat exchange between the tube-side and shell-side media. In addition, the liquid inlet section and the liquid outlet section are straight pipes, which can be processed and shaped into shape and then fitted into the heat exchange cavity. The straight pipe shape of the liquid inlet section and the liquid outlet section facilitates the positioning of the heat exchange tube group and reduces interference between structures during the fitting process, thereby facilitating the processing and assembly of the spiral wound tube heat exchanger.

[0022] 3. In a preferred embodiment of this utility model, the first isolation chamber is isolated from the second isolation chamber. The first isolation chamber can contain a medium, and the medium in the first isolation chamber is the same as the medium flowing into the first inlet. The isolation between the first and second isolation chambers prevents the inlet section and the outlet section from being in the same space. After passing through the spiral section, the tube-side medium in the outlet section has already exchanged heat with the shell-side medium in the heat exchange chamber, resulting in a large temperature difference between the tube-side medium in the inlet section and the tube-side medium in the outlet section. This prevents heat flow and exchange between the tube-side medium in the inlet section and the tube-side medium in the outlet section. The heat of the tube-side medium in the inlet section is maintained, allowing it to flow into the spiral section and exchange heat with the shell-side medium in the heat exchange chamber. The first isolation chamber can hold a medium, which is the same as the medium flowing into the first inlet. The medium in the first isolation chamber has the same heat as the medium in the inlet section, which can maintain the heat of the medium in the inlet section and prevent the medium in the inlet section from exchanging heat with the outside through the pipe wall of the inlet section.

[0023] 4. In a preferred embodiment of this utility model, a guide groove is provided on the side of the inlet tube plate facing the inlet cavity. The guide groove extends spirally to form an inlet channel. Multiple connecting holes are arranged at intervals along the extension direction of the inlet channel. The first inlet is connected to the inlet channel. The diameter of the first inlet is larger than the diameter of the connecting hole. The medium flows into the inlet channel from the first inlet and flows rapidly within the inlet channel, gradually flowing into the heat exchange tube assembly through the connecting hole. The inlet channel can maintain the flow velocity of the medium, preventing the precipitation of impurities in the liquid medium on the inlet tube plate after the flow velocity slows down. This prevents impurities from accumulating and blocking the connecting holes, thus avoiding a reduction in the medium in part of the heat exchange tube assembly and a decrease in the heat exchange efficiency with the shell-side medium in the heat exchange cavity.

[0024] 5. In a preferred embodiment of this utility model, multiple flow-blocking plates are provided inside the heat exchange cavity. These flow-blocking plates are located between adjacent spiral segments and are complete flat plate structures. A flow gap exists between the flow-blocking plate and the inner wall of the heat exchange cavity, with adjacent flow gaps staggered. There is no structural connection between adjacent spiral segments in the heat exchange cavity. The location of the flow-blocking plates between adjacent spiral segments reduces structural interference with the heat exchange tube bundle, facilitating the installation of the flow-blocking plates within the heat exchange cavity. Furthermore, designing the flow-blocking plates as complete flat plate structures avoids the need for clearance holes to avoid the heat exchange tube bundle, making the processing of the flow-blocking plates easier. In addition, the flow-blocking plates obstruct the flow of the shell-side medium within the heat exchange cavity, allowing the shell-side medium to flow through the flow gaps. This increases the flow path of the shell-side medium, prolongs the heat exchange time between the shell-side and tube-side media, and improves the heat exchange efficiency of the spiral wound tube heat exchanger. Attached Figure Description

[0025] The accompanying drawings, which are included to provide a further understanding of the present invention and constitute a part of this invention, illustrate exemplary embodiments of the present invention and, together with the description thereof, serve to explain the present invention and do not constitute an undue limitation thereof. In the drawings:

[0026] Figure 1 This is a structural schematic diagram of the cross-section of the spiral wound tube heat exchanger according to one embodiment of the present invention;

[0027] Figure 2 This is a side view of the inlet tube sheet according to one embodiment of the present invention.

[0028] in:

[0029] 1. Shell; 11. Heat exchange chamber; 12. First liquid inlet; 13. First liquid outlet; 14. Second liquid inlet; 15. Second liquid outlet;

[0030] 2. Heat exchanger tube assembly; 21. Spiral section; 22. Liquid inlet section; 23. Liquid outlet section;

[0031] 3. First isolation panel; 31. First isolation compartment;

[0032] 4. Second isolation panel; 41. Second isolation compartment;

[0033] 5. Inlet tube sheet; 51. Inlet chamber; 52. Connecting hole; 53. Inlet channel;

[0034] 6. Baffle plate; 61. Flow gap. Detailed Implementation

[0035] To more clearly illustrate the overall concept of this utility model, a detailed description will be provided below with reference to the accompanying drawings.

[0036] Many specific details are set forth in the following description in order to provide a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Therefore, the scope of protection of the present invention is not limited to the specific embodiments disclosed below.

[0037] Furthermore, it should be understood in the description of this utility model that the terms "top", "bottom", "inner", "outer", "axial", "radial", "circumferential", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0038] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a communication connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0039] In this invention, unless otherwise expressly specified and limited, the first feature "on" or "below" the second feature may be in direct contact with the first and second features, or indirect contact through an intermediate medium. In the description of this specification, references to terms such as "implementation," "example," "aspect," or "specific example" indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0040] like Figure 1As shown, a spiral wound tube heat exchanger includes a shell 1, a heat exchange tube bundle inside the shell 1, and a heat exchange cavity 11 between the shell 1 and the heat exchange tube bundle. The shell 1 has a first liquid inlet 12 and a first liquid outlet 13 communicating with the heat exchange tube bundle. The heat exchange tube bundle is divided into multiple heat exchange tube groups 2, each of which is independently connected to the first liquid inlet 12 and the first liquid outlet 13. At least a portion of the heat exchange tube group 2 spirally wraps around the axis of the shell 1 to form a spiral segment 21. The spiral segments 21 of different heat exchange tube groups 2 are arranged at intervals along the axial direction of the shell 1. The multiple spiral segments 21 work independently to exchange heat with the medium in the heat exchange cavity 11 respectively.

[0041] At least a portion of the heat exchange tube assembly 2 spirally surrounds the axis of the shell 1 to form a spiral segment 21. The tube-side medium in the heat exchange tube assembly 2 and the shell-side medium in the heat exchange cavity 11 exchange heat primarily through the sidewall of the spiral segment 21. This invention does not limit the direction of heat exchange. The tube-side medium in the heat exchange tube assembly 2 has a higher temperature, while the shell-side medium in the heat exchange cavity 11 has a lower temperature. Heat flows from the tube-side medium to the shell-side medium, used to raise the temperature of the shell-side medium in the heat exchange cavity 11. Alternatively, the tube-side medium in the heat exchange tube assembly 2 has a lower temperature, while the shell-side medium in the heat exchange cavity 11 has a higher temperature. Heat flows from the shell-side medium to the tube-side medium, used to cool the shell-side medium in the heat exchange cavity 11.

[0042] At least a portion of the heat exchange tube assembly 2 spirally surrounds the axis of the shell 1 to form a spiral segment 21. The spiral segment 21 increases the heat exchange area between the shell-side medium and the tube-side medium, thereby improving heat exchange efficiency. Furthermore, the shell 1 is generally a columnar structure with a circular cross-section perpendicular to its axis. The spiral segment 21 is evenly distributed circumferentially within the heat exchange cavity 11, and the shell-side medium in contact with the spiral segment 21 is also evenly distributed circumferentially within the heat exchange cavity 11, improving the uniformity of heat exchange between the tube-side medium and the shell-side medium. Additionally, the shell 1 has a second inlet 14 and a second outlet 15 communicating with the heat exchange cavity 11. The second inlet 14 and the second outlet 15 are located on opposite sides of the axial direction of the shell 1, and the shell-side medium flows from the second inlet 14 to the second outlet 15 within the heat exchange cavity 11. When the shell-side medium flows in the heat exchange cavity 11, it is blocked by the spiral section 21, which slows down the flow speed and increases the heat exchange time. Guided by the spiral section 21, part of the shell-side medium generates a spiral flow along the spiral section 21, which further increases the uniformity of heat exchange.

[0043] Based on this, such as Figure 1As shown, different heat exchange tube assemblies 2 are independently connected to the first liquid inlet 12 and the first liquid outlet 13. The spiral segments 21 of the different heat exchange tube assemblies 2 are arranged at intervals along the axial direction of the shell 1, dividing the heat exchange chamber 11 into multiple heat exchange regions along the axial direction. The spiral segments 21 within each heat exchange region operate independently, exchanging heat with the medium within that region. Multiple spiral segments 21 are independently connected to the first liquid inlet 12 and the first liquid outlet 13, exchanging heat with the medium in the heat exchange chamber 11 through the spiral segments 21. This maintains a high temperature difference between the tube-side medium flowing to the spiral segments 21 and the shell-side medium in the heat exchange chamber 11, thus improving the heat exchange rate. The shell-side medium in the heat exchange chamber 11 flows sequentially through multiple heat exchange regions, all of which can undergo rapid heat exchange, allowing the shell-side medium in the heat exchange chamber 11 to reach a suitable temperature in a short time, thereby improving the heat exchange efficiency of the spiral wound tube heat exchanger.

[0044] As a preferred embodiment of this utility model, such as Figure 1 As shown, the heat exchange tube assembly 2 has an inlet section 22 located upstream of the spiral section 21 and communicating with the first liquid inlet 12, and an outlet section 23 located downstream of the spiral section 21 and communicating with the first liquid outlet 13. Both the inlet section 22 and the outlet section 23 are straight pipes. The straight pipe design of the inlet section 22 and the outlet section 23 reduces the area of ​​heat exchange between the tube-side medium in the heat exchange tube assembly 2 and the outside through the pipe wall of the inlet section 22. Furthermore, the tube-side medium has a faster flow velocity within the straight pipe, allowing it to flow quickly to the spiral section 21. This reduces the time for heat exchange between the tube-side medium in the inlet section 22 and the outside, further reducing the heat exchange between them. This ensures that the tube-side medium flowing from the inlet section 22 to the spiral section 21 maintains a large temperature difference with the shell-side medium in the heat exchange chamber 11, thereby achieving rapid heat exchange between the tube-side and shell-side media. In addition, the liquid inlet section 22 and the liquid outlet section 23 are straight pipes, which can be processed and shaped into each heat exchange tube group 2 and then fitted into the heat exchange cavity 11. The straight pipe shape of the liquid inlet section 22 and the liquid outlet section 23 facilitates the positioning of the heat exchange tube group 2 and reduces interference between structures during the fitting process, thereby facilitating the processing and assembly of the spiral wound tube heat exchanger.

[0045] In one embodiment, such as Figure 1As shown, the shell 1 is provided with a first liquid inlet 12 and a first liquid outlet 13. The first liquid inlet 12 and the first liquid outlet 13 are located on opposite sides of the shell 1 along its axial direction. The liquid inlets of multiple heat exchange tube groups 2 are connected to the same first liquid inlet 12, and the liquid outlets of multiple heat exchange tube groups 2 are connected to the same first liquid outlet 13. When the spiral wound tube heat exchanger is in operation, it is only necessary to connect the tube-side medium supply tank to the first liquid inlet 12 and the tube-side medium collection tank to the first liquid outlet 13 to complete the installation of the spiral wound tube heat exchanger, thus simplifying the installation structure of the spiral wound tube heat exchanger. In this embodiment, the liquid inlet section 22 and the liquid outlet section 23 are straight pipes extending along the axial direction of the shell 1.

[0046] Preferred, such as Figure 1 As shown, a first isolation plate 3 and a second isolation plate 4 are provided inside the shell 1. The first isolation plate 3 cooperates with the shell 1 to form a first isolation chamber 31, and the second isolation plate 4 cooperates with the shell 1 to form a second isolation chamber 41. The liquid inlet section 22 is located inside the first isolation chamber 31, and the liquid outlet section 23 is located inside the second isolation chamber 41. The first isolation chamber 31 isolates the liquid inlet section 22. The location of the liquid inlet section 22 within the first isolation chamber 31 can further reduce the heat exchange between the tube-side medium in the liquid inlet section 22 and the outside environment, and maintain the temperature difference between the tube-side medium flowing from the liquid inlet section 22 to the spiral section 21 and the shell-side medium in the heat exchange chamber 11. In addition, the liquid inlet section 22 is located in the first isolation chamber 31 and the liquid outlet section 23 is located in the second isolation chamber 41, which fixes the heat exchange tube assembly 2 and isolates the liquid inlet section 22 and the liquid outlet section 23 from the shell-side medium in the heat exchange chamber 11, thereby reducing the impact of the shell-side medium on the heat exchange tube assembly 2 during flow and the resulting vibration of the heat exchange tube assembly 2.

[0047] Furthermore, the heat exchange tube assembly 2 consists of multiple heat exchange tubes, and the diameter of the first liquid inlet 12 is larger than the diameter of the heat exchange tubes. A liquid inlet plate 5 is generally installed between the first liquid inlet 12 and the heat exchange tube assembly 2. The liquid inlet plate 5 has multiple communicating holes 52 that communicate with the heat exchange tube assembly 2. This serves two purposes: firstly, to fix the heat exchange tube assembly 2, and secondly, to isolate the first liquid inlet 12 from the heat exchange chamber 11, allowing the tube-side medium flowing into the first liquid inlet 12 to transition to the heat exchange tube assembly 2, preventing leakage into the heat exchange chamber 11 and thus contaminating the shell-side medium. In this embodiment, as... Figure 1As shown, the first isolation plate 3 isolates the first liquid inlet 12 and the heat exchange chamber 11. No openings are required on the first isolation plate 3, making the isolation method more convenient and avoiding medium leakage caused by imperfect sealing between the multiple connecting holes 52 and the heat exchange tube.

[0048] Preferred, such as Figure 1 As shown, the first isolation chamber 31 is isolated from the second isolation chamber 41. The first isolation chamber 31 can contain the medium, and the medium inside the first isolation chamber 31 is the same as the medium flowing into the first inlet 12. The isolation between the first isolation chamber 31 and the second isolation chamber 41 prevents the inlet section 22 and the outlet section 23 from being in the same space. After passing through the spiral section 21, the tube-side medium in the outlet section 23 has already exchanged heat with the shell-side medium in the heat exchange chamber 11, resulting in a large temperature difference between the tube-side medium in the inlet section 22 and the tube-side medium in the outlet section 23. This prevents heat flow and exchange between the tube-side medium in the inlet section 22 and the tube-side medium in the outlet section 23. The heat of the tube-side medium in the inlet section 22 is maintained, allowing it to flow into the spiral section 21 and exchange heat with the shell-side medium in the heat exchange chamber 11. The first isolation chamber 31 can contain a medium, which is the same as the medium flowing into the first liquid inlet 12. The medium in the first isolation chamber 31 has the same heat as the medium in the liquid inlet section 22, which can maintain the heat of the medium in the liquid inlet section 22 and prevent the medium in the liquid inlet section 22 from exchanging heat with the outside through the pipe wall of the liquid inlet section 22.

[0049] This invention does not limit the number of the first inlet 12 and the first outlet 13. In another embodiment, each spiral segment 21 is provided with one first inlet 12 and one first outlet 13, which are respectively located at both ends of the corresponding spiral segment 21 along the axial direction. This can reduce the length of the inlet segment 22 and the outlet segment 23, and reduce the time for heat exchange between the tube medium in the inlet segment 22 and the outside world.

[0050] As a preferred embodiment of this utility model, such as Figure 1As shown, the spiral wound tube heat exchanger has an inlet tube plate 5 at the liquid inlet end of the heat exchange tube bundle. An inlet cavity 51 is formed between the inlet tube plate 5 and the first liquid inlet 12. The inlet tube plate 5 has multiple connecting holes 52 that connect to the heat exchange tube assembly 2, allowing the first liquid inlet 12 to communicate with the heat exchange tube assembly 2. The end of the heat exchange tube assembly 2 is fixed to the connecting hole 52. The inlet tube plate 5 fixes the heat exchange tube assembly 2 from the end, reducing vibrations caused by changes in the flow direction of the tube-side medium within the heat exchange tube assembly 2. The first liquid inlet 12 communicates with the heat exchange tube assembly 2 through the connecting hole 52, allowing the tube-side medium flowing into the first liquid inlet 12 to be diverted into multiple heat exchange tube assemblies 2.

[0051] Specifically, in this embodiment, such as Figure 1 As shown, the first liquid inlet 12 is located on the side wall of the first isolation chamber 31. The first isolation plate 3 isolates the first liquid inlet 12 and the heat exchange chamber 11. The liquid inlet tube plate 5 is located inside the first isolation chamber 31. The liquid inlet tube plate 5 is located below the first liquid inlet 12. The liquid inlet tube plate 5 extends along the vertical axis. The liquid inlet tube plate 5 and the first liquid inlet 12 form a liquid inlet chamber 51.

[0052] As a preferred embodiment of this implementation, such as Figure 2 As shown, the inlet tube sheet 5 has a guide groove on the side facing the inlet chamber 51. The guide groove extends spirally to form an inlet channel 53. Multiple connecting holes 52 are arranged at intervals along the extension direction of the inlet channel 53. The first inlet port 12 is connected to the inlet channel 53. The diameter of the first inlet port 12 is larger than the diameter of the connecting hole 52. The medium flows into the inlet channel 53 from the first inlet port 12, flows rapidly within the inlet channel 53, and gradually flows into the heat exchange tube assembly 2 through the connecting holes 52. The inlet channel 53 can maintain the flow rate of the medium, preventing the medium flow rate from slowing down and reducing the precipitation of impurities in the liquid medium on the inlet tube sheet 5. This prevents impurities from accumulating and blocking the connecting holes 52, which would reduce the amount of medium in part of the heat exchange tube assembly 2 and decrease the heat exchange efficiency with the shell-side medium in the heat exchange chamber 11.

[0053] This invention does not limit the formation method of the flow guide groove. In one embodiment, a groove is formed by compression molding on the liquid inlet tube plate 5, and the groove extends spirally to form the flow guide groove. In another embodiment, the liquid inlet tube plate 5 is a flat plate structure, and a flow guide plate perpendicular to the liquid inlet tube plate 5 is provided on the liquid inlet tube plate 5. The flow guide plate extends spirally on the plane of the liquid inlet tube plate 5, and the flow guide groove is formed between the flow guide plates.

[0054] Preferably, the connecting hole 52 is connected to each of the heat exchange tube groups 2 in a one-to-one correspondence, and the heat exchange tube groups 2 connected to adjacent connecting holes 52 are different. When the tube-side medium flowing in through the first liquid inlet 12 flows along the liquid inlet channel 53, it sequentially flows through the connecting hole 52 into different heat exchange tube groups 2, thereby reducing the difference in the amount of tube-side medium in multiple heat exchange tube groups 2, and avoiding the tube-side medium from flowing to some heat exchange tube groups 2 in a concentrated manner, while the tube-side medium in other heat exchange tube groups 2 is less, which would lead to uneven heat exchange of the shell-side medium in the heat exchange cavity 11 and affect the heat exchange efficiency of the spiral wound tube heat exchanger.

[0055] Specifically, such as Figure 1 As shown, the heat exchange tube bundle includes a first heat exchange tube group, a second heat exchange tube group, and a third heat exchange tube group, arranged along the flow direction of the liquid inlet channel 53, as follows: Figure 2 As shown, the first connecting hole 52 is connected to the first heat exchange tube group, the second connecting hole 52 is connected to the second heat exchange tube group, the third connecting hole 52 is connected to the third heat exchange tube group, and the fourth connecting hole 52 is connected to the first heat exchange tube group, thereby realizing the alternating connection of the connecting hole 52 to different heat exchange tube groups 2.

[0056] As a preferred embodiment of this utility model, such as Figure 1 As shown, the spiral segment 21 spirally surrounds the axis of the shell 1, and the spiral directions of adjacent spiral segments 21 are opposite. When the shell-side medium flows in the heat exchange cavity 11, it is first affected by the first spiral segment 21, causing a portion of the shell-side medium to generate a spiral flow along the spiral direction of the first spiral segment 21. This propels the shell-side medium to flow circumferentially, increasing the contact time with the spiral segment 21 and promoting the uniformity of the shell-side medium in the circumferential direction. The second spiral segment 21 has a spiral direction opposite to that of the first spiral segment 21. When the shell-side medium flows towards the second spiral segment 21, turbulence is generated, which not only promotes a more uniform flow of the shell-side medium in the radial plane but also reduces the flow velocity of the shell-side medium and increases the time for heat exchange with it.

[0057] Preferred, such as Figure 1As shown, multiple flow-blocking plates 6 are arranged inside the heat exchange cavity 11. The flow-blocking plates 6 are located between adjacent spiral segments 21. The flow-blocking plates 6 are complete flat plate structures. There are flow gaps 61 between the flow-blocking plates 6 and the inner wall of the heat exchange cavity 11, and adjacent flow gaps 61 are staggered. There is no connecting structure between adjacent spiral segments 21 in the heat exchange cavity 11. The flow-blocking plates 6 are located between adjacent spiral segments 21 and are arranged perpendicular to the axis of the shell 1. This can reduce structural interference with the heat exchange tube bundle, facilitate the installation of the flow-blocking plates 6 in the heat exchange cavity 11, and allow the flow-blocking plates 6 to be designed as complete flat plate structures. This avoids the need for avoidance holes on the flow-blocking plates 6 to avoid the heat exchange tube bundle, and makes the processing of the flow-blocking plates 6 easier. In addition, the flow baffle 6 obstructs the flow of the shell-side medium in the heat exchange cavity 11, allowing the shell-side medium to flow through the flow gap 61, which increases the flow path of the shell-side medium, increases the heat exchange time between the shell-side medium and the tube-side medium, and improves the heat exchange effect of the spiral wound tube heat exchanger.

[0058] Preferably, the flow velocity of the medium in the heat exchange tube assembly 2 is greater than the flow velocity of the medium in the heat exchange chamber 11. The higher flow velocity of the medium in the heat exchange tube assembly 2 allows the tube-side medium, after heat exchange, to flow out of the heat exchange tube assembly 2 quickly, pushing the unexchanged tube-side medium into the heat exchange tube assembly 2, thereby increasing the heat exchange rate with the shell-side medium in the heat exchange chamber 11. The slower flow velocity of the medium in the heat exchange chamber 11 increases the heat exchange time between the shell-side medium in the heat exchange chamber 11 and the tube-side medium in the heat exchange tube assembly 2, thereby improving the heat exchange effect on the shell-side medium.

[0059] For any parts not mentioned in this utility model, existing technologies can be used or referenced.

[0060] The various embodiments in this specification are described in a progressive manner. The same or similar parts between the various embodiments can be referred to each other. Each embodiment focuses on describing the differences from other embodiments.

[0061] The above description is merely an embodiment of this utility model and is not intended to limit the scope of this utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principle of this utility model should be included within the scope of the claims of this utility model.

Claims

1. A spiral wound tube heat exchanger, comprising a shell, a heat exchange tube bundle inside the shell, and a heat exchange cavity between the shell and the heat exchange tube bundle, characterized in that, The shell has a first liquid inlet and a first liquid outlet that connect to the heat exchange tube bundle. The heat exchange tube bundle is divided into multiple heat exchange tube groups. Each heat exchange tube group is independently connected to the first liquid inlet and the first liquid outlet. At least a portion of each heat exchange tube group spirally surrounds the axis of the shell to form a spiral segment. The spiral segments of different heat exchange tube groups are spaced apart along the axial direction of the shell. Multiple spiral segments work independently to exchange heat with the medium in the heat exchange chamber.

2. The spiral wound tube heat exchanger according to claim 1, characterized in that, The heat exchange tube assembly has an inlet section located upstream of the spiral section and connected to the first liquid inlet, and an outlet section located downstream of the spiral section and connected to the first liquid outlet. The inlet section and the outlet section are straight pipes.

3. The spiral wound tube heat exchanger according to claim 2, characterized in that, The housing is provided with a first isolation plate and a second isolation plate. The first isolation plate and the housing cooperate to form a first isolation chamber, and the second isolation plate and the housing cooperate to form a second isolation chamber. The liquid inlet section is located in the first isolation chamber, and the liquid outlet section is located in the second isolation chamber.

4. The spiral wound tube heat exchanger according to claim 3, characterized in that, The first isolation chamber is isolated from the second isolation chamber. The first isolation chamber can contain the medium, and the medium inside the first isolation chamber is the same as the medium flowing into the first inlet.

5. The spiral wound tube heat exchanger according to claim 1, characterized in that, The spiral wound tube heat exchanger is provided with a liquid inlet tube plate at the liquid inlet end of the heat exchange tube bundle. A liquid inlet cavity is formed between the liquid inlet tube plate and the first liquid inlet. The liquid inlet tube plate is provided with a plurality of connecting holes that connect to the heat exchange tube bundle so that the first liquid inlet is connected to the heat exchange tube bundle.

6. The spiral wound tube heat exchanger according to claim 5, characterized in that, A guide groove is provided on the side of the liquid inlet tube plate facing the liquid inlet chamber. The guide groove extends spirally to form a liquid inlet channel. A plurality of the connecting holes are arranged at intervals in the extension direction of the liquid inlet channel. The first liquid inlet is connected to the liquid inlet channel.

7. The spiral wound tube heat exchanger according to claim 6, characterized in that, The connecting holes are connected to each of the heat exchange tube groups in a one-to-one correspondence, and the heat exchange tube groups connected to adjacent connecting holes are different.

8. The spiral wound tube heat exchanger according to claim 1, characterized in that, The spiral segment spirals around the axis of the shell, and the spiraling directions of adjacent spiral segments are opposite.

9. The spiral wound tube heat exchanger according to claim 1, characterized in that, The heat exchange cavity is provided with multiple flow baffles, which are located between adjacent spiral sections. Each flow baffle is a complete flat plate structure, and there is a flow gap between the flow baffle and the inner wall of the heat exchange cavity. Adjacent flow gaps are staggered.

10. The spiral wound tube heat exchanger according to claim 1, characterized in that, The flow velocity of the medium inside the heat exchange tube assembly is greater than the flow velocity of the medium inside the heat exchange cavity.

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