Spiral baffle plate heat exchanger

Abstract

The invention discloses a spiral baffle plate heat exchanger which comprises a shell and a heat exchange tube and further comprises spiral baffle plates and a central baffle assembly, and the central baffle assembly comprises a first central baffle plate and a second central baffle plate. The first central baffle plate and the second central baffle plate are arranged on the inner side of the spiral baffle plate along the central axis of the spiral baffle plate, an overflowing hole is formed in the first central baffle plate, no overflowing hole is formed in the second central baffle plate, and the size of the first central baffle plate is larger than that of the second central baffle plate. By arranging the center baffling assembly, a medium in a shell pass forms a complex flow path on the inner side of a spiral baffle plate, the situation that a dead zone is generated on the inner side of the spiral baffle plate is reduced, relative turbulent flow is generated with spiral plunger flow on the outer side, a complex flow field is formed in a heat exchanger shell, and it can be guaranteed that the heat exchange efficiency of the heat exchanger is improved on the premise that the heat exchange performance of the heat exchanger is not reduced. And the processing efficiency is greatly improved.

Description

Technical Field

[0001] The present invention relates to the field of shell and tube heat exchangers for chemical machinery, and in particular to a spiral baffle heat exchanger. Background Art

[0002] With the advancement of industrialization and the rapid development of emerging industries, the heat exchanger market is steadily expanding. Demand for heat exchangers is steadily increasing, particularly in the chemical, petroleum, power, pharmaceutical, and food industries. At the same time, demand for high-efficiency heat exchange equipment is also increasing in new energy and environmental protection sectors. Currently, annual heat exchanger production has reached tens of millions of units. Continuous spiral baffle heat exchangers are widely used due to their high heat transfer efficiency, significant energy savings, and reduced fouling.

[0003] CN113927257B discloses a method for processing spiral baffles. This method can produce an ideal spiral baffle with a ruled spiral surface, a central hole spiral line tending toward a straight line, and all tube holes of the baffle parallel to the central axis. However, because the inner spiral line of the spiral baffle tends toward a straight line, the tube holes at large angles near the inner spiral line are very difficult to process. Currently, this can only be done by wire cutting, which has low processing efficiency. For example, a single spiral baffle with a diameter of 1 meter and a pitch of 500 mm has approximately 20 heat exchange tube holes near the inner spiral line that are difficult to process. Using wire cutting, the processing time for each heat exchange tube hole is approximately 30 minutes. Therefore, it takes 10 hours to complete the processing of the tube holes near the inner spiral line of the single spiral baffle. For a 6-meter-long heat exchanger, approximately 10 single spiral baffles are generally required, and processing the tube holes near the inner spiral line alone takes 100 hours. This results in extremely low processing efficiency and high production costs. Moreover, since the spiral baffle has large deformation and residual stress near the inner spiral line, the inner formed tube hole is easily deformed by heat during the process of processing the tube hole on the outer side, which greatly increases the difficulty of tube threading.

[0004] In order to solve the problem that the curvature of the spiral surface of the spiral baffle near the central axis changes greatly, which makes it very difficult to process the continuous curved surface and locate the holes on the curved surface. CN100453951C discloses a combined spiral baffle shell and tube heat exchanger, which is provided with a discontinuous inner spiral baffle in the central area, and a continuous annular outer spiral baffle in the area outside the central area that meets the processing requirements, forming a combined spiral baffle structure. The inner spiral baffle is formed by overlapping a number of fan-shaped or elliptical flat plates, and the outer edge of each inner spiral baffle is installed tightly against the outer spiral baffle. And because the inner spiral baffle is arranged in a spiral along the inner spiral line of the outer spiral baffle, it is time-consuming and labor-intensive to overlap the single inner spiral baffle and the outer spiral baffle, and when in use, because the two are only connected by edge to edge, the vibration of the medium fluid will cause the stability of the inner spiral baffle. In addition, the inner spiral baffle is also provided with tube holes for the heat exchange tubes to pass through. However, within the same lead, in order to ensure the smooth passage of the heat exchange tubes, the inner spiral baffles arranged at different positions on the inner side of the spiral baffle have different processing angles of the tube holes, which requires the design of multiple inner spiral baffles with different tube hole opening directions, and the assembly process is highly sequential, and the assembly process is very prone to errors.

[0005] CN117948817B discloses a center-tube-free spiral baffle heat exchanger. A set of baffle rod assemblies is provided at the center of the spiral baffle, i.e., on the inner side of the spiral baffle. The baffle rod assembly can be used to pass the heat exchange tube. The baffle rod assembly includes a set of special-shaped baffle rods and a set of cross-shaped baffle rods. The set of special-shaped baffle rods and the set of cross-shaped baffle rods are welded together in sequence, so that the entire baffle rod assembly is distributed in a spiral shape. The baffle rod assembly is then fixed to the inner side of the spiral baffle. It can be seen that the baffle rod assembly has a complex structure and is difficult to manufacture. Each set of special-shaped baffle rods and cross-shaped baffle rods are connected by welding, and the groups are also connected by welding. This makes assembly very inconvenient, and fixing the baffle rod assembly is also difficult to achieve. Since the flow of the medium during use of the spiral baffle heat exchanger will generate vibration, the baffle rod assembly is prone to falling off after long-term use.

[0006] Therefore, it is urgent to design a spiral baffle heat exchanger to solve the problems existing in the above-mentioned prior art. Summary of the Invention

[0007] The purpose of the present 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 flow of the medium at the center of the heat exchanger shell is improved and the dead zone is reduced. Therefore, without reducing the heat transfer performance of the heat exchanger, the processing efficiency of the baffle is greatly improved and the processing cost is significantly reduced.

[0008] In order to achieve the above technical objectives, the technical solution of the present invention provides:

[0009] A spiral baffle heat exchanger includes a shell and a heat exchange tube. The heat exchanger also includes a spiral baffle and a center baffle assembly. The center baffle assembly includes a first center baffle and a second center baffle. The first center baffle and the second center baffle are arranged on the inner side of the spiral baffle along the central axis of the spiral baffle. The first center baffle is provided with a flow hole, and the second center baffle is not provided with a flow hole. The size of the first center baffle is larger than that of the second center baffle.

[0010] Furthermore, the first central baffle and the second central baffle are both provided with a plurality of heat exchange tube holes for the heat exchange tubes to pass through.

[0011] Furthermore, leakage holes are provided on the hole bridge of the first central baffle.

[0012] Furthermore, leakage holes are provided on the hole bridge of the second central baffle.

[0013] Furthermore, the flow hole is opened at the center of the first central baffle.

[0014] Furthermore, the first center baffle and the second center baffle are both non-spiral structures, the first center baffle forms a first projection along the axial direction of the spiral baffle, and the second center baffle forms a second projection along the axial direction of the spiral baffle. The first projection is annular, and the second projection is circular or irregular.

[0015] Furthermore, the first projection and the second projection are taken as a union to form a third projection, the spiral baffle forms a fourth projection along its axial direction, the inner contour of the fourth projection is circular or irregular, and the third projection partially overlaps or does not overlap with the fourth projection.

[0016] Furthermore, the first central baffle and the second central baffle are both positioned by a combination of a pull rod and a distance tube, and are fixedly arranged on the inner side of the spiral baffle.

[0017] Furthermore, the shell diameter of the heat exchanger ranges from 100 to 8000 mm.

[0018] Furthermore, the outer diameter of the heat exchange tube of the heat exchanger ranges from 10 to 89 mm.

[0019] Compared with the prior art, the present invention has the following beneficial effects:

[0020] 1. A central baffle assembly with a specific structure is provided in the heat exchanger, the central baffle assembly including a first central baffle and a second central baffle, the first central baffle and the second central baffle being provided on the inner side of the spiral baffle along the central axis of the spiral baffle; the central baffle assembly has a simple structure and is easy to process, and the central baffle assembly blocks the medium flowing in the inner area of ​​the spiral baffle, effectively reducing the flow velocity of the medium at the center of the heat exchanger; at the same time, the inner medium accelerates when passing through the flow hole of the first central baffle, impacts the second central baffle, is blocked by the second central baffle and diffuses and flows in all directions, and repeats this process, forming a complex flow path on the inner side of the spiral baffle, reducing the dead zone on the inner side of the spiral baffle, and the inner medium can also generate relative turbulence with the spiral plunger flow formed in the outer spiral baffle, forming a complex flow field in the heat exchanger shell, improving the flow state of the fluid, increasing the degree of turbulence, greatly improving the surface heat transfer coefficient of the heat exchange tube, and significantly reducing the processing cost without reducing the heat exchange performance. Therefore, the above-mentioned structure significantly improves processing efficiency without compromising the heat exchange performance of the heat exchanger, resolving the existing difficulty and low efficiency of machining the heat exchange tube holes in the central area of ​​the spiral baffles. 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 in the central baffle can be reduced to a minimum of 10 minutes. Compared to the 100 hours required for machining the tube holes near the inner spiral line through wire cutting, this significantly improves processing speed, increases processing efficiency, and significantly reduces processing costs.

[0021] 2. By arranging leakage holes on the hole bridges of the first center baffle and the second center baffle, when the medium impacts the first center baffle, it can flow out through the leakage holes, thereby preventing a dead zone from being generated on the back of the first center baffle; similarly, when the medium impacts the second center baffle, it can flow out through the leakage holes, thereby preventing a dead zone from being generated on the back of the second center baffle, and the high-speed thin flow columns passing through the leakage holes further increase the complexity of the medium flow at the center of the heat exchanger shell, thereby effectively improving the heat exchange efficiency at the center of the heat exchanger shell.

[0022] 3. Since multiple first center baffles and second center baffles are arranged on the inner side of the spiral baffle along the central axis of the spiral baffle, there is no need to arrange them spirally along the spiral line on the inner side of the spiral baffle, and the assembly efficiency is greatly improved; and the first center baffle and the second center baffle can be positioned by a combination of pull rods and distance tubes, and fixedly arranged on the inner side of the spiral baffle without unnecessary welding points. During the long-term use of the heat exchange tube, it is not easy to be damaged or fall off.

[0023] 4. Several heat exchange tubes are passed through the central baffle assembly, which supports the heat exchange tubes passing through it. At the same time, the outer spiral baffles can also provide overall support for the heat exchange tube bundle passing through the central baffle assembly, effectively preventing the heat exchange tubes from being deformed due to their own gravity or the vibration caused by the flow of the medium in the shell.

[0024] Other features and advantages of the present invention will be described in the following description, and in part will become apparent from the description, or will be understood by practicing the present invention. The purpose and other advantages of the present invention can be realized and obtained by the structures pointed out in the description and the drawings. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0026] Figure 2 This is a front view of the central baffle assembly in an embodiment of the present invention;

[0027] Figure 3 Schematic diagram of the central baffle assembly in accordance with an embodiment of the present invention;

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

[0029] Figure 5 This is a top view of the spiral baffle and the central baffle assembly in accordance with an embodiment of the present invention.

[0030] The markings of the components in the accompanying drawings are as follows:

[0031] 1. Shell; 2. Tube box; 3. Tube sheet; 4. Heat exchange tube; 5. Spiral baffle; 6. Center baffle assembly; 61. First center baffle; 62. Second center baffle; 7. Heat exchange tube hole. DETAILED DESCRIPTION

[0032] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention 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 only used to explain the present invention and are not intended to limit the present invention.

[0033] The embodiment of the present invention provides a spiral baffle heat exchanger, such as Figure 1-5As shown, it includes a shell 1 and a heat exchange tube 4. The heat exchanger also includes a spiral baffle 5 and a center baffle assembly 6. The center baffle assembly includes a first center baffle 61 and a second center baffle 62. The first center baffle 61 and the second center baffle 62 are arranged on the inner side of the spiral baffle 5 along the central axis of the spiral baffle 5. The first center baffle 61 is provided with a flow hole, and the second center baffle 62 is not provided with a flow hole. The size of the first center baffle 61 is larger than that of the second center baffle 62.

[0034] Preferably, the first central baffle 61 and the second central baffle 62 are alternately arranged on the inner side of the spiral baffle 5 along the central axis of the spiral baffle 5 .

[0035] Preferably, the flow hole is opened at the center of the first central baffle.

[0036] The spiral baffle 5 is provided with a plurality of heat exchange tube holes 7 for the heat exchange tubes 4 to pass through. The first central baffle 61 and the second central baffle 62 are both provided with a plurality of heat exchange tube holes 7 for the heat exchange tubes 4 to pass through.

[0037] The first center baffle 61 and the second center baffle 62 are both non-helical structures, which can be a planar structure, a curved surface structure or a wavy surface structure. The first center baffle 61 forms a first projection along the axial direction of the spiral baffle 5, and the second center baffle 62 forms a second projection along the axial direction of the spiral baffle 5. The first projection is annular, and the second projection is circular or irregular.

[0038] The first projection and the second projection are taken as a union to form a third projection, and the spiral baffle forms a fourth projection along its axial direction. The inner contour of the fourth projection is circular or irregular, and the fourth projection partially overlaps or does not overlap with the third projection. When the outer edge size of the central baffle component 6 is larger than the inner edge size of the spiral baffle 5, the outer edge of the third projection partially overlaps with the fourth projection; when the outer edge size of the central baffle component 6 is slightly smaller than the inner edge size of the spiral baffle 5, the outer edge of the third projection does not overlap with the fourth projection; Figure 5 As shown, when the outer edge shape and size of the central deflection component 6 are the same as the inner edge shape and size of the spiral deflection plate 5, the outer edge of the third projection and the fourth projection are spliced ​​in a non-overlapping manner to form a complete projection area.

[0039] By setting a central baffle assembly 6 with a specific structure in the heat exchanger, the central baffle assembly includes a first central baffle plate 61 and a second central baffle plate 62, and the first central baffle plate 61 and the second central baffle plate 62 are arranged on the inner side of the spiral baffle plate 5 along the central axis of the spiral baffle plate 5; the central baffle assembly 6 has a simple structure and is easy to process. The central baffle assembly 6 blocks the medium flowing in the inner area of ​​the spiral baffle plate 5, effectively reducing the flow rate of the medium at the center of the heat exchanger; at the same time, the flow rate of the inner medium is accelerated when passing through the flow hole of the first central baffle plate 61, and the flow of the medium at the center of the heat exchanger is reduced. The fluid hits the second central baffle 62, is blocked by the second central baffle 61, and diffuses and flows in all directions, and repeats this process, thus forming a complex flow path similar to an S-shaped flow on the inner side of the spiral baffle 5, reducing the dead zone on the inner side of the spiral baffle 5. In addition, the inner medium can also generate relative turbulence with the spiral plunger flow formed in the outer spiral baffle 5, forming a complex flow field in the heat exchanger shell, 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. Without reducing the heat exchange performance, the processing cost is significantly reduced. Therefore, the above-mentioned structure can ensure that the processing efficiency is greatly improved without reducing the heat exchange performance of the heat exchanger, and solves the problem of difficult and low efficiency in processing the heat exchange tube holes in the central area 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 processing time for all the tube holes in the center baffle can be shortened to at least 10 minutes. Compared with the 100 hours it takes to process the tube holes near the inner spiral line through wire cutting, the processing speed is significantly improved, the processing efficiency is increased, and the processing cost is greatly reduced.

[0040] To further increase the complexity of medium flow in the center of the heat exchanger shell, leakage holes are also provided on the perforated bridge of the first central baffle 61. Preferably, a plurality of leakage holes are provided on the perforated bridge of the first central baffle 61. When the medium impacts the first central baffle 61, it can flow out through the leakage holes, thereby preventing the formation of a dead zone at the back of the first central baffle 61.

[0041] Similarly, leakage holes are also provided on the hole bridge of the second central baffle 62. Preferably, a plurality of leakage holes are provided on the hole bridge of the second central baffle 62. When the medium impacts the second central baffle 62, it can flow out through the leakage holes, thereby preventing a dead zone from forming on the back of the second central baffle 62.

[0042] The provision of the leakage holes further improves the heat exchange efficiency at the center of the heat exchanger shell.

[0043] like Figure 1As shown, the heat exchanger shell 1 is fixedly connected to tube sheets 3 at both ends. Several heat exchange tubes 4, spiral baffles 5, and a central baffle assembly are arranged between the two tube sheets 3. Pipe boxes 2 are respectively arranged outside the two tube sheets 3. The 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 and shell-side liquid outlet pipes are respectively provided on the side walls of the shell 1.

[0044] The central heat exchange tube bundle passes through the central baffle assembly 6, and the outer heat exchange tube bundle passes through the spiral baffles 5. The central baffle assembly 6 supports the heat exchange tubes 4 passing through it, while the outer spiral baffles 5 also provide overall support for the central heat exchange tube bundle passing through the central baffle assembly 6, effectively preventing deformation of the heat exchange tubes 4 due to their own gravity or vibration caused by the medium flowing in the shell.

[0045] The first central baffle 61 and the second central baffle 62 are each provided with a plurality of heat exchange tube holes 7 for the heat exchange tubes 4 to pass through. The opening directions of all heat exchange tube holes 7 are consistent and the deformation curvature is small. The first central baffle 61 and the second central baffle 62 can be flat plates or non-flat plates, such as irregularly curved structures. However, regardless of the plate structure of the first central baffle 61 and the second central baffle 62, the opening directions of all heat exchange tube holes 7 on the plate bodies are consistent. By setting the opening directions of all heat exchange tube holes 7 on the first central baffle 61 and the second central baffle 62 to be consistent, the heat exchange tube holes 7 on the first central baffle 61 and the second central baffle 62 do not need to be repositioned during the opening operation, greatly improving the opening efficiency and thereby improving the overall production efficiency of the heat exchanger. The heat exchange tube holes 7 on the first central baffle 61 and the second central baffle 62 can be processed using a variety of methods, preferably, laser cutting or drilling.

[0046] The angle between the normal of the tangent plane at any point on the first central baffle 61 and the second central baffle 62 and the central axis of the spiral baffle is 0° to 60°. When the first central baffle 61 and the second central baffle 62 are both flat plates, the first central baffle 61 and the second central baffle 62 can be arranged perpendicular to the central axis of the spiral baffle 5, or the central baffle 6 can be arranged at an angle relative to the central axis of the spiral baffle 5. Preferably, the angle between the normal of the first central baffle 61 and the second central baffle 62 and the central axis of the spiral baffle is 0°.

[0047] In order to ensure that the first center baffle 61 and the second center baffle 62 can be stably arranged inside the spiral baffle 5, the first center baffle 61 and the second center baffle 62 are positioned by a combination of a pull rod and a distance tube, and are fixedly arranged inside the spiral baffle 5. The distance tube ensures that the spacing between two adjacent first center baffles 61 or two adjacent second center baffles 62 remains unchanged, thereby ensuring that the center baffle assembly 6 is stably arranged inside the spiral baffle 5, avoiding the problem of the center baffle assembly 6 changing position due to fluid impact, which affects the heat exchange efficiency. Preferably, the center baffle assembly 6 and the spiral baffle 5 are both positioned by a combination of a pull rod and a distance tube.

[0048] The central baffle assembly 6 is arranged in a straight line parallel to the central axis of the spiral baffle plate, without the need for spiral arrangement, and the assembly efficiency is greatly improved. In addition, the first central baffle plate 61 and the second central baffle plate 62 in the central baffle assembly 6 do not need to be welded to the spiral baffle plate, and there are no redundant welding points. During the long-term use of the heat exchange tube 4, it is not easy to be damaged or fall off.

[0049] The diameter of the shell 1 of the heat exchanger ranges from 100 to 8000 mm; the outer diameter of the heat exchange tube 4 of the heat exchanger ranges from 10 to 89 mm.

[0050] The structural types of heat exchangers include fixed tube sheet type, U-tube type, floating head type and stuffing box type.

[0051] An embodiment of the present invention provides a spiral baffle heat exchanger. When in use, medium A enters the tube box 2 on one side from the tube-side liquid inlet pipe, then flows through the heat exchange tube 4 and completes heat exchange with medium B entering the shell 1 from the shell-side liquid inlet pipe. Then, medium A enters the tube box 2 on the other side through the heat exchange tube 4 and flows out from the tube-side liquid outlet pipe, while medium B flows out from the shell-side liquid outlet pipe.

[0052] Medium B enters the shell 1 from the shell side liquid inlet, and most of the medium B flows along the spiral channel formed by the spiral baffle 5 to form a spiral plug flow, fully contacting the heat exchange tube 4. A small amount of medium B enters the inner side of the spiral baffle 5. Since a central baffle component 6 is provided on the inner side of the spiral baffle 5, and the central baffle component 6 is a first central baffle 61 and a second central baffle 62 alternately arranged along the central axis of the spiral baffle, medium B forms a complex flow path on the inner side of the spiral baffle 5, reducing the dead zone generated on the inner side of the spiral baffle.

[0053] Specifically, after medium B is blocked by the outer ring of the first central baffle 61, it flows through its flow hole at high speed and impacts the second central baffle 62 located in the front. The liquid bypasses the second central baffle 62 and diffuses around it. Part of medium B will flow to the next first central baffle 61, and part of medium B will cause relative turbulence to the spiral plunger flow on the outside, forming a complex flow field in the shell of the heat exchanger, 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.

[0054] Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein; and these modifications or replacements 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 a heat exchange tube (4), characterized in that: The heat exchanger further comprises a spiral baffle (5) and a central baffle assembly (6), wherein the central baffle assembly comprises a first central baffle (61) and a second central baffle (62), wherein the first central baffle (61) and the second central baffle (62) are arranged on the inner side of the spiral baffle (5) along the central axis of the spiral baffle (5), wherein the first central baffle (61) is provided with an overflow hole, and the second central baffle (62) is not provided with an overflow hole, and the size of the first central baffle (61) is larger than the size of the second central baffle (62).

2. The spiral baffle heat exchanger according to claim 1, characterized in that: The first central baffle (61) and the second central baffle (62) are both provided with a plurality of heat exchange tube holes (7) for the heat exchange tubes (4) to pass through.

3. The spiral baffle heat exchanger according to claim 2, characterized in that: The hole bridge of the first central baffle (61) is also provided with leakage holes.

4. The spiral baffle heat exchanger according to claim 2, characterized in that: The hole bridge of the second central baffle (62) is also provided with leakage holes.

5. The spiral baffle heat exchanger according to claim 1, characterized in that: The flow hole is opened at the center of the first central baffle (61).

6. The spiral baffle heat exchanger according to claim 2, characterized in that: The first central baffle (61) and the second central baffle (62) are both non-helical structures. The first central baffle (61) forms a first projection along the axial direction of the spiral baffle (5), and the second central baffle (62) forms a second projection along the axial direction of the spiral baffle (5). The first projection is annular, and the second projection is circular or irregular.

7. The spiral baffle heat exchanger according to claim 6, characterized in that: The first projection and the second projection are combined to form a third projection, and the spiral baffle (5) forms a fourth projection along its axial direction. The inner contour of the fourth projection is circular or irregular, and the third projection partially overlaps or does not overlap with the fourth projection.

8. The spiral baffle heat exchanger according to claim 1, characterized in that: The first central baffle (61) and the second central baffle (62) are both positioned by a combination of a pull rod and a distance tube, and are fixedly arranged on the inner side of the spiral baffle (5).

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

10. 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.

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