Continuous spiral baffle plate heat exchanger without central pipe

Abstract

The invention discloses a continuous spiral baffle heat exchanger without a central tube, and belongs to the technical field of shell-and-tube heat exchangers, the continuous spiral baffle heat exchanger without the central tube comprises an external structure, the external structure comprises a shell and an end cover, a plurality of baffle assemblies are arranged in the shell, and each baffle assembly comprises a first plate, a second plate and a third plate which are sequentially arranged from the axis to the outside; a dynamic anti-scaling device is arranged on the third plate and used for cleaning a scale layer at the joint of the third plate and the inner wall of the shell, and by means of the heat exchanger, the problem of scaling at the joint of the continuous spiral baffle and the inner wall of the shell is solved by means of an alternate water injection mode in the heat exchange process, fluid distribution is optimized, the heat exchange efficiency is improved, and the heat exchange efficiency is improved. Local flow channel blockage caused by scale accumulation is prevented, liquid in the shell pass spirally flows more uniformly, dead zones are prevented from being formed, the turbulence degree is enhanced, the heat exchange efficiency is greatly improved, the energy efficiency is improved, the operation and maintenance cost is reduced, and meanwhile it is ensured that equipment can stably operate for a long period.

Description

Technical Field

[0001] The heat exchange device of the present invention more specifically relates to the technical field of shell and tube heat exchangers, and more specifically to a center tube-free continuous spiral baffle heat exchanger. Background Art

[0002] The shell and tube heat exchanger is a widely used partition-type heat exchanger. Its basic structure consists of a shell, tube bundle, tube sheet, head (end cover) and baffle / support plate. It mainly achieves temperature regulation through heat transfer between the two fluids inside and outside the tube bundle (i.e., the liquid in the shell side and the liquid in the tube side). It is widely used in many fields such as chemical industry, electricity, food, refrigeration, etc. Its core function is to transfer heat from the high-temperature fluid to the low-temperature fluid through the heat transfer surface without mixing the two fluids, so as to meet the heating, cooling, condensation, evaporation and other needs in the process.

[0003] The center tube-less continuous spiral baffle heat exchanger is a high-efficiency heat exchange equipment with an optimized structure based on the shell and tube heat exchanger. Its core feature is that it abandons the traditional center tube design and adopts continuous spiral baffles to improve heat exchange efficiency and fluid flow performance. The baffles are arranged in a continuous spiral shape and extend spirally along the axial direction of the shell (rather than the intermittent, vertical or inclined arrangement of traditional baffles). The edges of adjacent baffles overlap each other to form a continuous spiral channel, and the shell-side fluid can flow continuously in the spiral direction.

[0004] At present, in the existing spiral baffle heat exchanger, the liquid in the shell side flows in a spiral manner along the spiral baffle. During the flow process, due to the change in the flow channel curvature and the uneven distribution of the liquid flow velocity on the surface of the spiral baffle, a local low-speed vortex zone is easily formed, that is, the water flow near the central axis of the spiral baffle has a high axial flow velocity and a low radial velocity, which has a high scouring intensity on the middle part of the baffle and can inhibit fouling. However, the impact of particles causes greater wear on the middle position of the baffle. In the area where the baffle contacts the shell, due to the corner formed by the spiral surface of the baffle and the inner wall of the shell, the flow direction of the fluid suddenly changes here, resulting in low axial flow velocity and high radial velocity, which makes particles easily aggregate and form fouling, especially low-speed dead zones formed at the corners. When the medium contains solid particles or high-viscosity components, the particles will deposit more quickly in the vortex zone. These fouling will cause differences in heat conduction, resulting in uneven heat exchange efficiency at the corners. Local temperatures that are too high or too low will accelerate the crystallization or polymerization of substances (such as the cracking of heavy oil at high temperature to produce coke deposition). Summary of the Invention

[0005] The technical solution of the present invention addresses the technical problem that the existing technical solutions are too single, and provides a solution that is significantly different from the existing technology. The spiral baffle heat exchanger of the present invention belongs to a heat exchange device, and mainly provides a continuous spiral baffle heat exchanger without a center tube, which is used to solve the technical problem that in the spiral baffle heat exchanger proposed in the above background technology, the liquid in the shell side flows in a spiral manner along the spiral baffle. Due to the change in the curvature of the flow channel, the axial flow velocity is low and the radial velocity is high in the area where the baffle contacts the shell, which is easy to form scale and lead to uneven temperature.

[0006] The technical solution adopted by the present invention to solve the above technical problems is:

[0007] A center tube-less continuous spiral baffle heat exchanger comprises an external structure comprising a shell and end caps at both ends of the shell, the end caps being detachably connected to the shell. A plurality of baffle assemblies are disposed within the shell, with adjacent baffle assemblies welded end to end to form a spiral baffle. Each baffle assembly comprises a first plate, a second plate, and a third plate disposed outwardly from an axis. The third plate comprises a connecting portion and a flow guide portion, the flow guide portion being connected to the inner wall of the shell. A gap between the connecting portion and the flow guide portion forms a guide rail with a circular cross-section. The guide rails on each third plate are connected end to end to form a complete spiral channel.

[0008] A dynamic anti-fouling device is provided in the spiral channel, and the dynamic anti-fouling device includes a rolling ball, which is movably connected to the guide rail. Limiting plates are respectively provided on both sides of the rolling ball, and the limiting plates are located on both sides of the third plate. A threaded column and a rotating part on the threaded column are provided on each of the limiting plates, and the rotating part is used to clean the scale layer at the connection between the third plate and the inner wall of the shell.

[0009] Preferably, the rotating member includes a collar and a plurality of elastic scrapers, the collar is located on the threaded column, and the elastic scrapers are distributed around the outer wall of the collar at equal intervals.

[0010] Preferably, a sleeve is connected to the threaded portion of the threaded column, and a plurality of pushers are hinged on the sleeve. Each of the pushers includes a receiving plate and fan blades. The fan blades are located on the receiving plate, and the fan blades are distributed at equal intervals around the central axis of the sleeve.

[0011] Preferably, a cover plate with a through hole is provided at the opening of the sleeve, and a spring is provided in the cavity formed by the cover plate and the sleeve opening. One end of the spring passes through the through hole on the cover plate through a rope and is connected to the interface on each pusher respectively.

[0012] Preferably, the connection parts between the first plate, the second plate and the third plate are welded, and a plurality of through-holes are provided on the first plate and the second plate, and a tube bundle is provided in each of the through-holes. The tube bundle runs through the entire spiral baffle, and supporting tube sheets are provided at both ends of the tube bundle, and the outer support of the supporting tube sheet is connected to the inner wall of the shell.

[0013] Preferably, a plurality of distance rods are provided between each of the supporting tube sheets and the second plate member closest thereto, to ensure that the second plate member and the guide portion are located in the same spiral surface.

[0014] Preferably, the cross-section of the first plate is a trapezoidal structure, and the thickness gradually decreases from the central axis of the spiral deflector toward the outside.

[0015] Preferably, a plurality of groups of adjustment holes are arranged around the connecting portion, and the two adjustment holes in each group face opposite directions, and the cross-section of each adjustment hole is an isosceles trapezoidal structure.

[0016] Preferably, a first water inlet and a second water inlet are provided on the upper side of the outer wall of the shell, and a first water outlet and a second water outlet are provided on the lower side of the outer wall of the shell.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] (1) The present invention realizes that during the heat exchange process, the first water inlet and the second water outlet are connected first, and then the second water inlet and the first water outlet are connected, so as to achieve an alternating water injection mode for the liquid in the shell side, and is used to drive the dynamic anti-fouling device to move back and forth in a spiral along the spiral channel at the edge of the spiral baffle. The rolling ball, the limit plate, the threaded column, the sleeve, the pusher, the rotating part, the collar and the elastic scraper cooperate with each other, so that during the spiral movement, the scale at the connection between the spiral baffle and the inner wall of the shell, on the tube bundle close to the inner wall of the shell and in these areas with low axial flow velocity and high radial velocity can be scraped off, so as to avoid the adhesion and accumulation of scale to form scale, and better make these impurities flow out from the water outlet along the water flow, thereby optimizing the fluid distribution in the shell side, preventing the accumulation of scale from causing local flow channel blockage, making the spiral flow in the shell side more uniform, and avoiding "dead zone". It strengthens the turbulence, improves the heat transfer efficiency, and reduces the probability of a heat insulation layer formed on the edge of the tube bundle due to scale, further improving the heat transfer efficiency. At the same time, it reduces the electrochemical corrosion of the metal surface under the scale, prevents structural damage, reduces equipment deformation or leakage caused by local overheating or stress concentration due to scale accumulation, and extends the equipment maintenance cycle.

[0019] (2) The present invention realizes the ability to utilize the force of water flow to move by setting the pusher, receiving plate and fan blades, without the need for an additional power source, with a simple structure and reliable operation, and lower maintenance costs than traditional manual cleaning. It effectively ensures that the flow channel is in a smooth state for a long time, reduces the shell side pressure loss, reduces the power consumption of the external pump, and can further reduce the energy consumption cost. Due to the cooperation between the cover plate, spring and rope, the dynamic anti-fouling device receives the force of water at one end, and the water pressure opens the receiving plate, and under the action of the fan blade, it rotates itself while moving along the spiral channel, driving the elastic scraper to clean. There is no end that receives the force of water. The spring can close the pusher to the maximum extent through the rope, reducing resistance and further improving the overall cleaning efficiency. This application utilizes the innovative design of "passive fluid drive + dynamic contact cleaning" to integrate anti-fouling and cleaning functions into the heat exchanger structure, while improving energy efficiency and reducing operation and maintenance costs, ensuring the long-term stable operation of the equipment.

[0020] (3) The present invention first welds the connecting parts of the first plate, the second plate and the third plate to form a baffle assembly, and then welds the baffle assemblies head to tail in sequence to form a spiral baffle, thereby optimizing the overall assembly steps while ensuring the characteristics of different plates. Since the cross-section of the first plate is a trapezoidal structure, the thickness along the radial direction of the shell gradually decreases, so that without affecting the radial flow intensity of the water flow, it can better deal with the problem of high axial flow velocity and low radial velocity at the center axis of the shell, which causes high scouring intensity on the middle part of the baffle, thereby improving the wear resistance of the middle position of the baffle, so that the overall impact resistance, wear resistance and stability of the spiral baffle are improved. The two sides of the guide part of the third plate are curved structures, which can improve the corner formed by the existing baffle spiral surface and the inner wall of the shell, where the fluid flow direction suddenly changes, resulting in low axial flow velocity and high radial velocity, reducing the impact of the sudden change, and with the cooperation of the adjustment hole, the Venturi effect is used to further increase the axial flow velocity at the corner, which is conducive to promoting the dynamic anti-fouling device and also reduces the adhesion of impurity particles here.

[0021] The present invention will be explained in detail below with reference to the accompanying drawings and specific embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0023] Figure 2 It is a schematic diagram of the overall structure of the present invention;

[0024] Figure 3 This is an exploded schematic diagram of the spiral baffle of the present invention;

[0025] Figure 4This is an exploded schematic diagram of the baffle assembly of the present invention;

[0026] Figure 5 This is an exploded schematic diagram of the dynamic anti-fouling device of the present invention;

[0027] Figure 6 Schematic diagram of the adjustment hole structure in the third plate of the present invention;

[0028] Figure 7 It is a plan view of the baffle assembly of the present invention;

[0029] Figure 8 It is a schematic plan view of the dynamic anti-fouling device of the present invention.

[0030] In the figure: 1. External structure; 11. Shell; 12. End cover; 13. First water inlet; 14. Second water inlet; 15. First water outlet; 16. Second water outlet; 2. Baffle assembly; 21. First plate; 22. Second plate; 23. Third plate; 231. Connecting part; 232. Guide part; 233. Adjusting hole; 234. Guide rail; 24. Perforation; 3. Dynamic anti-fouling device; 31. Rolling ball; 32. Limiting plate; 33. Threaded column; 34. Sleeve; 35. Pusher; 351. Receiver plate; 352. Fan blade; 36. Cover plate; 37. Spring; 38. Rotating part; 381. Ring; 382. Elastic scraper; 4. Support tube sheet; 5. Distance rod; 6. Tube bundle. DETAILED DESCRIPTION

[0031] To facilitate understanding of the present invention, the present invention will be described more comprehensively below with reference to the relevant drawings. Several embodiments of the present invention are given in the drawings. However, the present invention can be implemented in different forms and is not limited to the embodiments described in the text. On the contrary, these embodiments are provided to make the content disclosed in the present invention more thorough and comprehensive.

[0032] It should be noted that when an element is referred to as being "fixed on" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used in this article are for illustrative purposes only.

[0033] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly used by those skilled in the art to which the present invention pertains. The terminology used in the specification of the present invention is for the purpose of describing specific embodiments and is not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more of the related listed items.

[0034] Example 1, please refer to the attached Figure 1-8 As shown, a center tube-free continuous spiral baffle heat exchanger includes an external structure 1, the external structure 1 includes a shell 11 and end covers 12 located at both ends of the shell 11, the end covers 12 and the shell 11 are detachably connected, a multi-section baffle assembly 2 is arranged in the shell 11, and the adjacent baffle assemblies 2 are welded end to end in sequence to form a spiral baffle, each of the baffle assemblies 2 includes a first plate 21, a second plate 22 and a third plate 23 arranged in sequence from the axis outward, the third plate 23 includes a connecting portion 231 and a guide portion 232, and the guide portion 232 is connected to the inner wall of the shell 11 and can be welded, and the gap between the connecting portion 231 and the guide portion 232 constitutes a guide rail 234 with a circular cross-section. The circular cross-section design ensures a large internal space, and the openings on both sides are narrow, one is to ensure the rolling ball The stability of the movement of the ball 31 in the guide rail 234 is improved. Secondly, the surface tension and viscous resistance of water have a significant hindering effect at the narrow mouth, which makes it difficult for water to flow in, ensuring the smoothness of the movement of the ball 31 and reducing the outflow of water from the guide rail 234, making the flow of water disordered. The guide rails 234 on each third plate 23 are connected end to end to form a complete spiral channel; a dynamic anti-fouling device 3 is provided in the spiral channel, and the dynamic anti-fouling device 3 includes a ball 31, which is movably connected to the guide rail 234, and limiting plates 32 are respectively provided on both sides of the ball 31, and the limiting plates 32 are located on both sides of the third plate 23, and each of the limiting plates 32 is provided with a threaded column 33 and a rotating part 38 on the threaded column 33, and the rotating part 38 is used to clean the scale layer at the connection between the third plate 23 and the inner wall of the shell 11.

[0035] The above structure achieves that during the heat exchange process, an alternating water injection mode can be used to avoid the problem of scale accumulation at the connection between the continuous spiral baffles and the inner wall of the shell 11, optimize the fluid distribution, prevent the accumulation of scale and cause local blockage of the flow channel, make the spiral flow in the shell more uniform, avoid the formation of "dead zones", enhance the degree of turbulence, greatly improve the heat exchange efficiency, and reduce the probability of the formation of an insulation layer due to scale on the edge of the tube bundle 6, further improving the heat exchange efficiency. At the same time, it reduces the electrochemical corrosion of the metal surface under the scale (such as oxygen concentration cell), prevents structural damage, reduces the deformation or leakage of equipment caused by local overheating or stress concentration due to scale accumulation, and extends the equipment overhaul period (from 1 to 2 years to 3 to 5 years). In addition, it uses water flow to drive self-cleaning, without the need for an additional power source (such as a motor or hydraulic system), has a simple structure and reliable operation, and has lower maintenance costs than traditional manual cleaning (such as mechanical scraping and chemical cleaning). Due to the long-term smooth flow channel, the shell side pressure loss is reduced, and the power consumption of the external pump is reduced, further reducing energy consumption costs. The "passive fluid drive + The innovative design of "dynamic contact cleaning" integrates anti-scaling and cleaning functions into the heat exchanger structure, improving energy efficiency and reducing operation and maintenance costs while ensuring long-term stable operation of the equipment.

[0036] The specific operation is as follows: the liquid in the tube side enters from one end cover 12, then passes through the tube bundle 6, and flows out from the other end cover 12; the shell side enters from the first water inlet 13 (or the second water inlet 14), passes through the spiral baffle between the two supporting tube sheets 4, and then flows out from the second water outlet 16 (or the first water outlet 15); in the process of connecting the first water inlet 13 and the second water outlet 16, the water will flow along the spiral baffle, and at the same time, the force of the water will push the pusher 35 on the side of the dynamic anti-scaling device 3 toward the first water inlet 13, and the pusher 35 will push through The rope stretches the spring 37, and the pusher 35 on the other side is closed to the maximum extent under the force of the spring 37 and the water flow (i.e., adjacent pushers 35 interfere with each other). Under the force of the water, the dynamic anti-fouling device 3 moves along the spiral surface, i.e., the ball 31 moves in the spiral channel formed by the guide rail 234, and under the action of the fan blade 352, it rotates while moving, thereby driving the elastic scraper 382 to act on the connection between the guide part 232 and the inner wall of the shell 11 and on the tube bundle 6 close to the inner wall of the shell 11, reducing particle adhesion and avoiding the formation of scale.

[0037] When it moves to the end of the spiral channel, the water flow direction is switched so that the second water inlet 14 and the first water outlet 15 are connected. At this time, under the action of the spring 37 and the water flow, the previously closed pusher 35 is opened, and the previously opened pusher 35 is closed, so that the entire device moves in the opposite direction, and then the above steps are repeated. The dynamic anti-fouling device 3 can then perform reciprocating spiral movement to clean and prevent particles from adhering to and forming scale.

[0038] Example 2, please refer to the attached Figure 2 、 3 , 4 and 6, the connection parts 231 of the first plate 21, the second plate 22 and the third plate 23 are welded, and the first plate 21 and the second plate 22 are provided with a plurality of through-holes 24, each of which is provided with a tube bundle 6, which runs through the entire spiral baffle, and both ends of the tube bundle 6 are provided with a support tube sheet 4, and the outer support of the support tube sheet 4 is connected to the inner wall of the shell 11. The stability of the spiral baffle is ensured by the cooperation between the tube bundle 6 and the support tube sheet 4. A plurality of distance rods 5 are provided between the support tube plate 4 and the second plate 22 closest thereto. The distance rods 5 are used to position and distance the spiral baffle, thereby further improving the stability of the spiral baffle and ensuring that the second plate 22 and the guide portion 232 are in the same spiral curved surface, so that the guide rail 234 forms a stable spiral channel. The cross section of the first plate 21 is a trapezoidal structure, and the thickness gradually decreases from the central axis of the spiral baffle outward. By increasing the thickness of the first plate 21 at the central axis of the shell 11, the spiral baffle is stabilized. The connection portion 231 is provided with a plurality of adjustment holes 233 around it, and the two adjustment holes 233 in each group face opposite directions. The cross section of each adjustment hole 233 is an isosceles trapezoidal structure. The adjustment hole 233 utilizes the Venturi effect to further increase the axial flow velocity at the corner. The narrow side of the adjustment hole 233 has a significant obstruction effect at the narrow mouth due to the surface tension and viscous resistance of the water, which reduces the inflow of water from the narrow side and interferes, ensuring that the first water inlet 13 and When the second water outlet 16 is connected, the regulating hole 233 facing the same side plays a role of speed increase, and the regulating hole 233 facing the other side will not interfere, and vice versa. The upper side of the outer wall of the shell 11 is provided with a first water inlet 13 and a second water inlet 14, and the lower side of the outer wall of the shell 11 is provided with a first water outlet 15 and a second water outlet 16. Through the cooperation between the first water inlet 13 and the second water outlet 16, and the second water inlet 14 and the first water outlet 15, the alternating forward and reverse flow of water in the shell side is realized.

[0039] Example 3, please refer to the attached Figure 3 and 5As shown, the rotating member 38 includes a collar 381 and a plurality of elastic scrapers 382. The collar 381 is located on the threaded column 33. The elastic scrapers 382 are evenly spaced and distributed around the outer wall of the collar 381. The elastic scrapers 382 are used to clean the impurity particles on the connection between the guide portion 232 and the inner wall of the shell 11 and the tube bundle 6 close to the inner wall of the shell 11 to avoid adhesion. The threaded portion on the threaded column 33 is connected to a sleeve 34. A plurality of pushers 35 are hinged on the sleeve 34. Each of the pushers 35 includes a receiving plate 351 and a fan blade 352. The fan blade 352 is located on the receiving plate 351 and is evenly spaced and distributed around the central axis of the sleeve 34. The receiving plate 351 is used to receive The force of water gives the device as a whole a forward thrust, and the fan blades 352 cause the device as a whole to rotate itself, and the spiral surface provided by the spiral deflector further causes the device as a whole to rotate itself to a certain extent, thereby ensuring the feasibility of the elastic scraper 382 to rotate and scrape. A cover plate 36 with a through hole is provided at the opening of the sleeve 34, and a spring 37 is provided in the cavity formed by the cover plate 36 and the opening of the sleeve 34. One end of the spring 37 is connected to the interface on each pusher 35 through the through hole on the cover plate 36 through a rope. The rope is pulled by the spring 37 to achieve the closure of the pusher 35 on the unused side to the greatest extent, that is, when there is interference between the sides of each two adjacent receiving plates 351.

[0040] The above description of the present invention is exemplified in conjunction with the accompanying drawings. It is obvious that the specific implementation of the present invention is not limited to the above-mentioned method. As long as such non-substantial improvements are made using the method concept and technical solution of the present invention, or the concept and technical solution of the present invention are directly applied to other occasions without improvement, they are all within the scope of protection of the present invention.

Claims

1. A center tube-free continuous spiral baffle heat exchanger, comprising an external structure (1), wherein the external structure (1) comprises a shell (11) and end covers (12) located at both ends of the shell (11), the end covers (12) and the shell (11) being detachably connected, a plurality of baffle assemblies (2) being arranged in the shell (11), and adjacent baffle assemblies (2) being welded end to end in sequence to form a spiral baffle, characterized in that Each of the baffle components (2) includes a first plate (21), a second plate (22), and a third plate (23) arranged in sequence outward from the axis, the third plate (23) including a connecting portion (231) and a flow guide portion (232), and the flow guide portion (232) is connected to the inner wall of the shell (11), and a gap between the connecting portion (231) and the flow guide portion (232) forms a guide rail (234) with a circular cross section, and the guide rail (234) on each third plate (23) is connected end to end to form a complete spiral channel; A dynamic anti-fouling device (3) is provided in the spiral channel. The dynamic anti-fouling device (3) includes a rolling ball (31). The rolling ball (31) is movably connected to the guide rail (234). Limiting plates (32) are respectively provided on both sides of the rolling ball (31). The limiting plates (32) are located on both sides of the third plate (23). Each of the limiting plates (32) is provided with a threaded column (33) and a rotating member (38) on the threaded column (33). The rotating member (38) is used to clean the scale layer at the connection between the third plate (23) and the inner wall of the shell (11).

2. A central tube-less continuous spiral baffle heat exchanger according to claim 1, characterized in that: The rotating member (38) comprises a collar (381) and a plurality of elastic scrapers (382), wherein the collar (381) is located on the threaded column (33), and the elastic scrapers (382) are distributed around the outer wall of the collar (381) at equal intervals.

3. The central tube-less continuous spiral baffle heat exchanger according to claim 2, characterized in that: The threaded portion on the threaded column (33) is connected to a sleeve (34), and a plurality of pushers (35) are hingedly connected to the sleeve (34). Each pusher (35) comprises a receiving plate (351) and a fan blade (352). The fan blade (352) is located on the receiving plate (351), and the fan blades (352) are distributed around the central axis of the sleeve (34) at equal intervals.

4. A central tube-less continuous spiral baffle heat exchanger according to claim 3, characterized in that: A cover plate (36) with a through hole is provided at the opening of the sleeve (34), and a spring (37) is provided in a cavity formed by the cover plate (36) and the opening of the sleeve (34). One end of the spring (37) passes through the through hole on the cover plate (36) via a rope and is respectively connected to an interface on each pusher (35).

5. The central tube-less continuous spiral baffle heat exchanger according to claim 1, characterized in that: The connecting portions (231) of the first plate (21), the second plate (22) and the third plate (23) are welded. The first plate (21) and the second plate (22) are each provided with a plurality of through-holes (24). A tube bundle (6) is provided in each of the through-holes (24). The tube bundle (6) passes through the entire spiral baffle. Support tube sheets (4) are provided at both ends of the tube bundle (6), and the outer support of the support tube sheet (4) is connected to the inner wall of the shell (11).

6. The central tube-less continuous spiral baffle heat exchanger according to claim 5, characterized in that: A plurality of distance rods (5) are provided between each supporting tube sheet (4) and the second plate member (22) closest thereto, ensuring that the second plate member (22) and the flow guide portion (232) are located within the same spiral surface.

7. The central tube-less continuous spiral baffle heat exchanger according to claim 5, characterized in that: The cross-section of the first plate (21) is a trapezoidal structure, and the thickness gradually decreases from the central axis of the spiral baffle toward the outside.

8. The central tube-less continuous spiral baffle heat exchanger according to claim 5, characterized in that: The connecting portion (231) is surrounded by a plurality of groups of adjustment holes (233), and the two adjustment holes (233) in each group face opposite directions. The cross-section of each adjustment hole (233) is an isosceles trapezoidal structure.

9. The central tube-less continuous spiral baffle heat exchanger according to claim 5, characterized in that: A first water inlet (13) and a second water inlet (14) are provided on the upper side of the outer wall of the shell (11), and a first water outlet (15) and a second water outlet (16) are provided on the lower side of the outer wall of the shell (11).

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