Spiral baffle plate heat exchanger

Abstract

The utility model discloses a spiral baffle plate heat exchanger which comprises a shell and a heat exchange tube, the heat exchanger further comprises a baffle plate assembly, the baffle plate assembly comprises a spiral baffle plate and a plurality of central baffle plates, and the plurality of central baffle plates are sequentially and fixedly arranged on the inner side of the spiral baffle plate along the central axis of the spiral baffle plate. The central baffle plate is simple in structure and convenient to machine, can block media flowing in the inner side areas of the spiral baffle plates, effectively reduces the flow speed of the media in the center of the heat exchanger, and forms relative turbulent flow with spiral plunger flow formed in the outer side spiral baffle plates, so that the flowing state of fluid is improved, and the turbulent flow degree is improved. Therefore, due to the arrangement of the structure, on the premise that the heat exchange performance of the heat exchanger is not reduced, the machining efficiency is greatly improved, and the problems that a heat exchange pipe hole in the center area of an original spiral baffle plate is large in machining difficulty and low in machining efficiency are solved.

Description

Technical Field

[0001] This utility model relates to the field of shell-and-tube heat exchangers in chemical machinery, specifically to a spiral baffle heat exchanger. Background Technology

[0002] With the advancement of industrialization and the rapid development of emerging industries, the heat exchanger market is gradually expanding. In particular, the demand for heat exchanger equipment is steadily increasing in fields such as chemical, petroleum, power, pharmaceutical, and food industries. At the same time, the demand for high-efficiency heat exchange equipment is also constantly increasing in fields such as new energy and environmental protection. Currently, the annual output of heat exchangers has reached tens of millions of units. Among them, continuous spiral baffle heat exchangers are widely used due to their high heat transfer efficiency, significant energy-saving effect, and low scaling.

[0003] CN113927257B discloses a method for processing a spiral baffle. This method can produce an ideal spiral baffle with a ruled surface, a central spiral that tends to be straight, and all tube holes having cylindrical surfaces parallel to the central axis. However, because the inner spiral of this spiral baffle tends to be straight, the tube holes near the large inclination angle of the inner spiral are very difficult to process. Currently, it can only be processed by wire cutting, which is inefficient. Taking a single spiral baffle with a diameter of 1m and a pitch of 500mm as an example, there are about 20 heat exchange tube holes near the inner spiral that are difficult to process. Using wire cutting, the processing time for a single heat exchange tube hole is about 30 minutes. Therefore, it takes 10 hours to complete the processing of the tube holes near the inner spiral of a single spiral baffle. For a 6m long heat exchanger, about 10 single spiral baffles are generally needed. Processing the tube holes near the inner spiral alone takes 100 hours, resulting in extremely low processing efficiency and high production costs. Furthermore, due to the large deformation and residual stress near the inner spiral of the spiral baffle, the already formed inner pipe hole is easily deformed by heat during the processing of the outer pipe hole, which greatly increases the difficulty of pipe insertion.

[0004] CN212778818U discloses a double-spiral baffle heat exchanger. By setting a first spiral plate and a second spiral plate, a double spiral flow path is formed inside the shell, which can effectively reduce the flow velocity of the liquid in the shell, thereby reducing the vibration generated when the liquid flows. However, setting a double-layer spiral baffle makes the manufacturing process complicated, and it still faces the problem of difficult and slow processing speed of the tube hole of the spiral baffle near the inner spiral line.

[0005] To address the problem of significant curvature changes in the helical surface near the central axis of helical baffles, which makes continuous surface machining and positioning drilling on the curved surface extremely difficult, CN100453951C discloses a combined helical baffle shell-and-tube heat exchanger. This exchanger features a discontinuous inner helical baffle in the central region and a continuous annular outer helical baffle in a region outside the central region that meets machining requirements, forming a combined helical baffle structure. The inner helical baffle is formed by overlapping several fan-shaped or elliptical flat plates, with the outer edge of each inner helical baffle tightly fitted to the outer helical baffle. Furthermore, because the inner helical baffles are arranged helically along the inner helix of the outer helical baffle, overlapping a single inner helical baffle with the outer helical baffle is time-consuming and labor-intensive. Moreover, during operation, since the connection is only edge-to-edge, vibrations in the fluid medium can affect the stability of the inner helical baffle. In addition, the inner spiral baffle is also provided with tube holes for the heat exchange tubes to pass through. However, in order to ensure that the heat exchange tubes pass through smoothly, the inner spiral baffles located at different positions on the inner side of the spiral baffle have different processing angles for the tube holes. This results in the need to design multiple inner spiral baffles with different tube hole opening directions, and the assembly process has a high degree of sequentiality, making it very easy to make mistakes during assembly.

[0006] CN117948817B discloses a centerless spiral baffle heat exchanger. It employs a set of baffle assemblies located at the center of the spiral baffle, inside the baffle, through which heat exchange tubes can pass. The baffle assembly includes a set of irregularly shaped baffles and a set of cross-shaped baffles. These are welded together sequentially to form a spiral arrangement before being fixed to the inner side of the spiral baffle. This design is complex and difficult to manufacture. The irregularly shaped and cross-shaped baffles are connected by welding, and the assemblies themselves are also welded together, making assembly inconvenient and fixing the baffle assembly difficult. Furthermore, the vibration generated by the medium flow during operation can cause the baffle assembly to detach after prolonged use.

[0007] Therefore, there is an urgent need to design a spiral baffle heat exchanger to solve the problems existing in the above-mentioned prior art. Utility Model Content

[0008] The purpose of this invention is to overcome the above-mentioned technical deficiencies and provide a spiral baffle heat exchanger. By optimizing the structure of the spiral baffle, the processing efficiency of the baffle is greatly improved without reducing the heat exchange performance of the heat exchanger, and the processing cost is significantly reduced.

[0009] To achieve the above-mentioned technical objectives, the technical solution of this utility model provides:

[0010] A spiral baffle heat exchanger includes a shell and heat exchange tubes. The heat exchanger also includes a baffle assembly, which includes a spiral baffle and a central baffle. A plurality of central baffles are sequentially and fixedly arranged on the inner side of the spiral baffle along the central axis of the spiral baffle.

[0011] Furthermore, the central baffle is a non-spiral structure, and the central baffle forms a first projection along the axial direction of the spiral baffle, the outer contour of the first projection being circular or irregular.

[0012] Furthermore, the spiral baffle forms a second projection along its axial direction, the inner contour of the second projection being circular or irregular, and the first projection and the second projection partially overlap or do not overlap.

[0013] Furthermore, the central baffle plate is provided with several heat exchange tube holes through which the heat exchange tubes pass.

[0014] Furthermore, the central baffle is positioned and fixedly arranged inside the spiral baffle by a combination of tie rods and spacer tubes.

[0015] Furthermore, the angle between the normal of the tangent plane at any point on the central baffle and the central axis of the spiral baffle is 0° to 60°.

[0016] Furthermore, the shell diameter of the heat exchanger ranges from 100 to 8000 mm.

[0017] Furthermore, the outer diameter of the heat exchanger tubes ranges from 10 to 89 mm.

[0018] Furthermore, the central baffle plate forms a first projection area along the axial direction of the spiral baffle plate, and the diameter of the minimum coverage circle of the first projection area ranges from 30 to 1000 mm.

[0019] Furthermore, heat exchanger structure types include fixed tube sheet type, U-tube type, floating head type and stuffing box type.

[0020] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0021] 1. By installing a baffle assembly with a specific structure inside the heat exchanger, including a spiral baffle and a central baffle, multiple central baffles are sequentially and fixedly arranged along the central axis of the spiral baffle inside the spiral baffle. The central baffle has a simple structure, is easy to manufacture, and can block the medium flowing in the inner region of the spiral baffle, effectively reducing the flow velocity of the medium at the center of the heat exchanger. It also creates relative turbulence with the spiral plunger flow formed in the outer spiral baffle, improving the fluid flow state and increasing the degree of turbulence. Therefore, the above structure can significantly improve the manufacturing efficiency without reducing the heat exchanger's heat exchange performance, solving the problem of high manufacturing difficulty and low efficiency in manufacturing the heat exchange tube holes in the central region of the original spiral baffle. For a baffle assembly with a diameter of 1m and a pitch of 500mm (assuming a heat exchanger requires 10 spiral baffles), the machining time for all the tube holes of the central baffle can be reduced to at least 10 minutes. Compared to the 100 hours required to machine the tube holes near the inner spiral line by wire cutting, the machining speed is significantly improved, the machining efficiency is increased, and the machining cost is greatly reduced.

[0022] 2. Since multiple central baffles are arranged sequentially along the central axis of the spiral baffle inside the spiral baffle, there is no need to arrange them spirally along the inner spiral line of the spiral baffle. There is no need to consider the order during the assembly process with the spiral baffle, which reduces the risk of errors and greatly improves assembly efficiency. In addition, the central baffle is a single plate without any extra welding points, which makes it less likely to be damaged or fall off during the long-term use of the heat exchange tube.

[0023] 3. Several heat exchange tubes pass through the central baffle. The central baffle supports the heat exchange tubes passing through it. At the same time, the outer spiral baffles also provide overall support for the heat exchange tube bundle passing through the central baffle, effectively preventing the heat exchange tubes from deforming due to their own weight or vibration caused by the flow of the medium in the shell side.

[0024] Other features and advantages of this invention will be set forth in the description which follows, and will be apparent in part from the description, or may be learned by practicing the invention. The objects and other advantages of this invention can be realized and obtained by means of the structures pointed out in the description and drawings. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the spiral baffle heat exchanger structure according to an embodiment of the present invention;

[0026] Figure 2 This is a front view of the baffle assembly according to an embodiment of the present utility model;

[0027] Figure 3 This is a three-dimensional schematic diagram of the baffle assembly according to an embodiment of the present utility model;

[0028] Figure 4 This is a top view of the spiral baffle plate according to an embodiment of the present invention;

[0029] Figure 5 This is a top view of the central baffle in the embodiment of this utility model;

[0030] Figure 6 This is a top view of the baffle assembly according to an embodiment of the present invention.

[0031] The components in the attached diagram are labeled as follows:

[0032] 1. Shell; 2. Tube box; 3. Tube sheet; 4. Heat exchange tubes; 5. Spiral baffle; 6. Central baffle; 7. Heat exchange tube holes. Detailed Implementation

[0033] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0034] This utility model embodiment provides a spiral baffle heat exchanger, such as Figure 1-6 As shown, the heat exchanger includes a shell 1 and a heat exchange tube 4. The heat exchanger also includes a baffle assembly, which includes a spiral baffle 5 and multiple central baffles 6. The multiple central baffles 6 are arranged in sequence along the central axis of the spiral baffle 5 on the inner side of the spiral baffle 5.

[0035] The central baffle 6 is a non-spiral structure, which can be a planar structure, an arc surface structure, or a wave surface structure. The central baffle 6 forms a first projection along the axial direction of the spiral baffle 5, and the outer contour of the first projection is circular or irregular.

[0036] The spiral baffle 5 forms a second projection along its axial direction, and the inner contour of the second projection is circular or irregular.

[0037] By incorporating a baffle assembly with a specific structure within the heat exchanger, comprising a spiral baffle 5 and a central baffle 6, multiple central baffles 6 are sequentially arranged along the central axis of the spiral baffle 5 on its inner side. The central baffle 6 has a simple structure, is easy to manufacture, and effectively blocks the medium flowing within the inner region of the spiral baffle 5, thereby reducing the flow velocity of the medium at the center of the heat exchanger. It also creates relative turbulence with the spiral plunger flow formed within the outer spiral baffle 5, improving the fluid flow state and increasing the degree of turbulence. Therefore, this structure significantly improves manufacturing efficiency without reducing the heat exchanger's heat transfer performance, solving the problems of high manufacturing difficulty and low efficiency in machining the heat exchange tube holes 7 in the central region of the original spiral baffle 5. For a baffle assembly with a diameter of 1m and a pitch of 500mm (assuming a heat exchanger requires 10 spiral baffles), the machining time for all the tube holes of the central baffle 6 can be reduced to at least 10 minutes. Compared with the 100 hours required to machine the tube holes near the inner spiral line by wire cutting, the machining speed is significantly improved, the machining efficiency is increased, and the machining cost is greatly reduced.

[0038] like Figure 1 As shown, tube sheets 3 are fixedly connected to both ends of the heat exchanger shell 1. Several heat exchange tubes 4 and baffle assemblies are arranged between the two tube sheets 3. Tube boxes 2 are respectively arranged on the outer sides of the two tube sheets 3. The two ends of the heat exchange tubes 4 pass through the two tube sheets 3 and extend into the two tube boxes 2. A tube-side liquid inlet pipe is provided on one tube box 2, and a tube-side liquid outlet pipe is provided on the other tube box 2. Shell-side liquid inlet pipes and shell-side liquid outlet pipes are respectively arranged on the side walls of the shell 1.

[0039] Multiple central baffles 6 in the baffle assembly are arranged in a straight line along the axial direction of the spiral baffle 5 on the inner side of the spiral baffle 5. Preferably, the multiple central baffles 6 have the same shape and size.

[0040] The spiral baffle 5 is provided with several heat exchange tube holes 7 through which the heat exchange tubes 4 pass, and the central baffle 6 is provided with several heat exchange tube holes 7 through which the heat exchange tubes 4 pass.

[0041] Preferably, the inner edge of the spiral baffle 5 and the outer edge of the central baffle 6 form multiple spliced ​​heat exchange tube holes 7 in the axial projection direction of the shell 1.

[0042] The central heat exchange tube bundle passes through several central baffles 6 in sequence, while the outer ring heat exchange tube bundle passes through spiral baffles 5. The central baffles 6 provide support for the heat exchange tubes 4 passing through them, while the outer spiral baffles 5 also provide overall support for the heat exchange tube bundle passing through the central baffles 6, effectively preventing deformation of the heat exchange tubes 4 due to their own weight or vibration caused by the flow of the medium in the shell side.

[0043] Preferably, the multiple central baffles 6 are arranged in parallel to each other.

[0044] Furthermore, by setting multiple central baffles 6 inside the spiral baffle 5, the simple structure and easy processing of the central baffles 6, especially when multiple central baffles 6 have the same shape and size, enable modular mass production, thereby greatly improving the production efficiency of the spiral baffle heat exchanger. Moreover, the central baffles 6 are arranged in a straight parallel line along the central axis of the spiral baffle, eliminating the need for a spiral arrangement. During assembly with the spiral baffle 5, there is no need to consider the order of operations, reducing the risk of errors and significantly improving assembly efficiency. Additionally, the central baffle 6 is a single plate without redundant welding points, making it less prone to damage or detachment during long-term use of the heat exchange tubes 4.

[0045] The central baffle 6 forms a first projection along the axial direction of the spiral baffle 5, and the spiral baffle 5 forms a second projection along its axial direction. The first and second projections may partially overlap or not overlap. When the outer edge dimension of the central baffle 6 is larger than the inner edge dimension of the spiral baffle 5, the outer edge of the first projection partially overlaps with the second projection; when the outer edge dimension of the central baffle 6 is slightly smaller than the inner edge dimension of the spiral baffle 5, the outer edge of the first projection area does not overlap with the second projection area. Figures 4 to 6 As shown, when the outer edge shape and size of the central baffle 6 are the same as the inner edge shape and size of the spiral baffle 5, the outer edge of the first projection area and the second projection area are spliced ​​together in a non-overlapping manner to form a complete projection area.

[0046] The central baffle 6 can block the medium flowing in the inner region of the spiral baffle 5, effectively reducing the flow velocity of the medium at the center of the heat exchanger. When the medium impacts the central baffle 6, it will diffuse in all directions, forming relative turbulence with the spiral plunger flow formed in the outer spiral baffle 5, improving the flow state of the fluid, increasing the degree of turbulence, and greatly improving the surface heat transfer coefficient of the heat exchange tube 4.

[0047] Preferably, the spiral baffle 5 has four central baffles 6 within a single lead, and the four central baffles 6 are arranged at equal intervals along the axis of the spiral baffle 5 on the inner side of the spiral baffle 5.

[0048] The central baffle plate 6 has multiple heat exchange tube holes 7 for heat exchange tubes 4 to pass through. All heat exchange tube holes 7 have the same opening direction and a small deformation curvature. The central baffle plate 6 can be a flat plate structure or a non-flat plate structure, such as an irregularly shaped curved structure. Regardless of the plate structure of the central baffle plate 6, the opening direction of all heat exchange tube holes 7 on its plate is consistent. By ensuring that the opening direction of all heat exchange tube holes 7 on the central baffle plate 6 is consistent, the opening angle of the heat exchange tube holes 7 on the central baffle plate 6 does not need to be repositioned during the opening process, greatly improving the opening efficiency and thus improving the overall production efficiency of the heat exchanger. The heat exchange tube holes 7 on the central baffle plate 6 can be processed using various methods; preferably, the processing method is laser cutting or drilling.

[0049] The angle between the normal of the tangent plane at any point on the central baffle and the central axis of the helical baffle is 0° to 60°. When the central baffle 6 is flat, it can be arranged perpendicular to the central axis of the helical baffle 5, or it can be inclined relative to the central axis of the helical baffle 5. Preferably, the angle between the normal of the central baffle 6 and the central axis of the helical baffle is 0°.

[0050] To ensure the stable placement of the central baffle 6 inside the spiral baffle 5, the central baffle 6 is positioned using a combination of tie rods and spacer tubes, and is fixedly arranged inside the spiral baffle 5. The spacer tubes ensure that the distance between adjacent central baffles 6 remains constant, thus guaranteeing the stable placement of the central baffle 6 inside the spiral baffle 5 and preventing positional changes due to fluid impact that could affect heat exchange efficiency. Preferably, both the central baffle 6 and the spiral baffle 5 are positioned using a combination of tie rods and spacer tubes.

[0051] Heat exchanger structures include fixed tube sheet type, U-tube type, floating head type and stuffing box type, etc.

[0052] The shell diameter of the heat exchanger ranges from 100 to 8000 mm; the outer diameter of the heat exchange tubes ranges from 10 to 89 mm.

[0053] The central baffle forms a first projection area along the axial direction of the spiral baffle, and the diameter of the minimum coverage circle of the first projection area ranges from 30 to 1000 mm.

[0054] The present invention provides a spiral baffle heat exchanger in which, during use, medium A enters one side tube box 2 from the tube side inlet pipe, and then medium A flows through the heat exchange tube 4 to exchange heat with medium B, which enters the shell 1 from the shell side inlet pipe. Then medium A enters the other side tube box 2 through the heat exchange tube 4 and flows out from the tube side outlet pipe, while medium B flows out from the shell side outlet pipe.

[0055] Medium B enters the shell 1 through the shell-side inlet. Most of the medium B flows along the spiral channel formed by the spiral baffle 5, forming a spiral plunger flow that makes full contact with the heat exchange tube 4. A small portion of the medium B enters the inner layer of the spiral baffle 5 and is blocked by the central baffle 6, effectively reducing the flow velocity of medium B at the center of the heat exchanger. When medium B impacts the central baffle 6, it diffuses outwards, creating relative turbulence with the spiral plunger flow formed in the outer spiral baffle 5. This improves the fluid flow state, increases the degree of turbulence, and greatly improves the surface heat transfer coefficient of the heat exchange tube 4. Without reducing the heat exchange performance, the processing cost is significantly reduced.

[0056] This utility model embodiment also provides a method for manufacturing a baffle assembly of a spiral baffle heat exchanger, which includes the following steps:

[0057] S1. The spiral baffle plate 5 and the central baffle plate 6 are manufactured separately using a modular process.

[0058] The baffle assembly in the spiral baffle heat exchanger provided in this embodiment of the invention consists of a spiral baffle 5 and a central baffle 6. The spiral baffle 5 is composed of multiple sector-shaped baffles spliced ​​together. These sector-shaped baffles have identical dimensions and can be manufactured using the same processing method. Therefore, the spiral baffle 5 can be manufactured using a modular process. Specifically, the sector-shaped baffles can be mass-produced through stretching, molding, or casting.

[0059] Multiple central baffles 6 arranged in a straight line and parallel to each other inside the spiral baffle 5 have the same shape and size. Therefore, they can be batch-cut using a laser cutting machine to obtain multiple central baffle 6 plates with the same specifications and dimensions.

[0060] S2. Based on the projection hole-opening process diagram of the complete baffle, laser hole-opening process is used to perform batch hole opening on the spiral baffle 5 plate and the central baffle 6 plate respectively.

[0061] The heat exchange tube holes 7 on the baffle assembly are evenly distributed. To ensure that the heat exchange tube holes 7 are evenly distributed after the spiral baffle 5 and the central baffle 6 are assembled, laser drilling is required on the spiral baffle 5 and the central baffle 6 based on the drilling process projection drawing of the same complete baffle. The specific operation is as follows:

[0062] Input the complete baffle plate opening process projection diagram into the PC of the laser cutting machine, place the central baffle plate 6 plate horizontally on the laser cutting worktable, and make the center of the central baffle plate 6 plate overlap with the center of the opening process projection diagram; start the laser cutting machine to laser open the central baffle plate 6 plate.

[0063] If the central baffle 6 is arranged at an angle perpendicular to the central axis of the spiral baffle 5 inside the spiral baffle 5, then the central baffle 6 is placed horizontally on the laser cutting worktable, and the center of the central baffle 6 overlaps with the center of the hole-opening process projection drawing.

[0064] If the central baffle 6 is arranged at a certain angle relative to the central axis of the spiral baffle 5 inside the spiral baffle 5, then the central baffle 6 is placed at an angle on the laser cutting table, with the center of the central baffle 6 overlapping the center of the hole-opening process projection drawing. The angle of inclination between the central baffle 6 and the laser cutting platform is complementary to the angle between the central baffle 6 and the central axis of the spiral baffle 5.

[0065] Input the hole-opening process projection diagram of the same complete baffle plate into the PC terminal of the laser cutting machine, fix the spiral baffle plate 5 plate body to the laser cutting worktable, make its central axis perpendicular to the laser cutting platform, and make the projection center of the spiral baffle plate 5 plate body overlap with the center of the hole-opening process projection diagram; start the laser cutting machine to laser-open the spiral baffle plate 5 plate body.

[0066] Since the central baffle plate 6 and the spiral baffle plate 5 are perforated based on the same complete baffle plate perforation process projection drawing, the heat exchange tube holes 7 on the inner edge of the spiral baffle plate 5 and the outer edge of the central baffle plate 6 can be assembled, and it can be ensured that the heat exchange tube holes 7 after the spiral baffle plate 5 and the central baffle plate 6 are assembled are uniformly distributed.

[0067] S3. Modularly assemble the perforated spiral baffle 5 and the central baffle 6 so that multiple central baffles 6 are arranged in a straight parallel line along the axial direction of the spiral baffle 5 on the inner side of the spiral baffle 5.

[0068] To ensure that the central baffle 6 can be stably installed inside the spiral baffle 5, the central baffle 6 is arranged sequentially along the central axis of the spiral baffle 5 inside the spiral baffle 5 using a spacer tube.

[0069] This utility model embodiment also provides a method for assembling the baffle assembly and heat exchange tubes of the above-mentioned spiral baffle heat exchanger, the assembly method being as follows:

[0070] S1. Pass several central baffles 6 through the tie rod A in sequence. Use a spacer tube to fix two adjacent central baffles 6. Then, insert several heat exchange tubes 4 into the heat exchange tube holes 7 on the central baffles 6 in sequence to form a central heat exchange tube bundle with central baffles 6.

[0071] S2. Several single spiral baffles 5 are passed through the tie rod B in sequence to form a continuous spiral baffle. Adjacent single spiral baffles 5 are fixed by a spacer tube.

[0072] S3. Insert the central heat exchange tube bundle with the central baffle 6 into the inner hole of the spiral baffle 5 (i.e., the inner hole formed by the inner spiral line of the spiral baffle 5), and then insert the heat exchange tubes into the heat exchange tube holes on the spiral baffle 5 from the inside to the outside to form the outer ring heat exchange tube bundle with the spiral baffle 5.

[0073] In addition, the central baffle 6 and the spiral baffle 5 can first be positioned by a combination of tie rods and spacer tubes to form a frame, and then several heat exchange tubes 4 can be passed through the heat exchange tube holes 7 from the inside to the outside.

[0074] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A spiral baffle heat exchanger, comprising a shell (1) and heat exchange tubes (4), characterized in that, The heat exchanger also includes a baffle assembly, which includes a spiral baffle (5) and a central baffle (6). A plurality of central baffles (6) are arranged in sequence along the central axis of the spiral baffle (5) on the inner side of the spiral baffle (5).

2. The spiral baffle heat exchanger according to claim 1, characterized in that, The central baffle (6) is a non-spiral structure, and the central baffle (6) forms a first projection along the axial direction of the spiral baffle (5), the outer contour of the first projection being circular or irregular.

3. The spiral baffle heat exchanger according to claim 2, characterized in that, The spiral baffle (5) forms a second projection along its axial direction. The inner contour of the second projection is circular or irregular. The first projection and the second projection may or may not overlap.

4. The spiral baffle heat exchanger according to claim 1, characterized in that, The central baffle (6) is provided with several heat exchange tube holes (7) through which the heat exchange tubes (4) pass.

5. The spiral baffle heat exchanger according to claim 1, characterized in that, The central baffle (6) is positioned by a combination of tie rods and spacer tubes and is fixedly arranged inside the spiral baffle (5).

6. The spiral baffle heat exchanger according to claim 2, characterized in that, The angle between the normal of the tangent plane at any point on the central baffle (6) and the central axis of the spiral baffle (5) is 0° to 60°.

7. The spiral baffle heat exchanger according to claim 1, characterized in that, The diameter of the heat exchanger shell (1) ranges from 100 to 8000 mm.

8. The spiral baffle heat exchanger according to claim 1, characterized in that, The outer diameter of the heat exchange tube (4) of the heat exchanger ranges from 10 to 89 mm.

9. The spiral baffle heat exchanger according to claim 2, characterized in that, The central baffle (6) forms a first projection area along the axial direction of the spiral baffle (5), and the diameter of the minimum coverage circle of the first projection area is in the range of 30 to 1000 mm.

10. The spiral baffle heat exchanger according to any one of claims 1 to 9, characterized in that, Heat exchanger structural types include fixed tube sheet type, U-tube type, floating head type and stuffing box type.

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