A continuous spiral baffle heat exchanger without center tube

Abstract

The application discloses a center-tube-free continuous helical baffle heat exchanger and belongs to the technical field of shell-and-tube heat exchangers, comprising an external structure, the external structure comprising a shell and an end cover, a plurality of baffle plate assemblies are arranged in the shell, each baffle plate assembly comprises a first plate piece, a second plate piece and a third plate piece which are sequentially arranged outward from an axis, a dynamic anti-fouling device is arranged on the third plate piece and is used for cleaning a scale layer at a connecting position of the third plate piece and an inner wall of the shell, through the application, in the heat exchange process, the alternating water injection mode is used to avoid the scale accumulation at the connecting position of the continuous helical baffle plate and the inner wall of the shell, the fluid distribution is optimized, the scale accumulation is prevented from causing the local flow channel to be blocked, the helical flow of the liquid in the shell is more uniform, the "dead zone" is avoided from being formed, the turbulence degree is strengthened, the heat exchange efficiency is greatly improved, the energy efficiency is improved, the operation and maintenance cost is reduced, and the long-period stable operation of the equipment is ensured.

Description

TECHNICAL FIELD

[0001] The heat exchange device of the present application, more particularly relates to the technical field of shell-and-tube heat exchanger, and particularly relates to a continuous helical baffle heat exchanger without central tube. BACKGROUND

[0002] The shell-and-tube heat exchanger is a widely used type of heat exchanger, which is composed of a shell, a tube bundle, a tube sheet, a head (end cover) and a baffle / support plate. The heat exchange is mainly achieved by heat transfer between the two fluids in the tube bundle (i.e. the liquid in the shell side and the tube side) to regulate the temperature, which is widely used in chemical industry, power industry, food industry, refrigeration industry and other fields. The core function of the shell-and-tube heat exchanger 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 needs of heating, cooling, condensation, evaporation and other needs in the process.

[0003] The continuous helical baffle heat exchanger without central tube is a high-efficiency heat exchange equipment optimized on the basis of the shell-and-tube heat exchanger. The core feature is to abandon the traditional central tube design and adopt the continuous helical baffle to improve the heat exchange efficiency and fluid flow performance. The baffle is arranged in a continuous helical shape and extends along the axial direction of the shell (rather than the traditional intermittent, vertical or inclined arrangement of the baffle). The edges of adjacent baffles are overlapped to form a continuous helical channel, and the shell-side fluid can flow continuously in the helical direction.

[0004] In the existing helical baffle heat exchanger, the liquid in the shell side flows in a helical manner along the helical baffle. During the flow process, due to the change in flow curvature and the uneven distribution of liquid flow velocity on the surface of the helical baffle, a local low-speed vortex zone is easily formed, i.e. the water flow near the central axis of the helical baffle. The axial flow velocity is high, the radial velocity is low, the scouring intensity of the middle part of the baffle is large, and the deposition can be inhibited, but the particle impact causes large wear on the middle part of the baffle. In the area where the baffle contacts the shell, due to the corner formed by the helical surface of the baffle and the inner wall of the shell, the flow direction of the fluid changes suddenly, resulting in low axial flow velocity and high radial velocity. Therefore, particles are easily accumulated to form deposition, especially in the corner area, where a low-speed dead zone is formed. When the medium contains solid particles or high-viscosity components, the particles will be deposited in the vortex zone more quickly. These depositions will cause differences in heat conduction, making the heat exchange efficiency at the corner uneven, and the local temperature too high or too low, which will accelerate the crystallization or polymerization of the material (such as the cracking of heavy oil to produce coke deposition at high temperature). SUMMARY

[0005] The technical scheme of the present application provides a solution significantly different from the prior art, and the spiral baffle heat exchanger of the present application belongs to a heat exchange device, and mainly provides a continuous spiral baffle heat exchanger without a central tube, to solve the technical problem that in the spiral baffle heat exchanger, the liquid in the shell passes along the spiral baffle in a spiral manner, 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 plate contacts the shell, and fouling is easily formed, resulting in uneven temperature.

[0006] The present application solves the above technical problems by adopting the following technical scheme:

[0007] A continuous spiral baffle heat exchanger without a central tube, comprising an external structure, the external structure comprising a shell and end covers located at both ends of the shell, the end covers being detachably connected with the shell, a plurality of baffle plate assemblies being arranged in the shell, the adjacent baffle plate assemblies being sequentially welded at the head and tail to form spiral baffles, each baffle plate assembly comprising first, second and third plate members arranged outwardly along an axis, the third plate member comprising a connecting portion and a flow guide portion, the flow guide portion being connected with the inner wall of the shell, and the gap between the connecting portion and the flow guide portion forming a guide rail with a circular cross section, the guide rails on each third plate member being connected at the head and tail to form a complete spiral channel.

[0008] A dynamic anti-fouling device is arranged in the spiral channel, the dynamic anti-fouling device comprising a rolling ball, the rolling ball being movably connected with the guide rail, and a limiting plate being arranged on each side of the rolling ball, the limiting plate being located on both sides of the third plate member, a threaded column and a rotating member on the threaded column being arranged on each limiting plate, the rotating member being used for cleaning the scale layer at the connection between the third plate member and the inner wall of the shell.

[0009] Preferably, the rotating member comprises a sleeve ring and a plurality of elastic scrapers, the sleeve ring being located on the threaded column, and the elastic scrapers being distributed at equal intervals around the outer wall of the sleeve ring.

[0010] Preferably, a sleeve is connected to the thread on the threaded column, a plurality of push members being hinged to the sleeve, each push member comprising a receiving plate and a fan blade, the fan blade being located on the receiving plate and being distributed at equal intervals around the central axis of the sleeve.

[0011] Preferably, a cover plate with a through hole is arranged at the opening of the sleeve, a spring being arranged in the cavity formed by the cover plate and the opening of the sleeve, one end of the spring being connected with an interface on each push member through a rope passing through the through hole on the cover plate.

[0012] Preferably, the connecting part between the first plate, the second plate and the third plate is welded, and a plurality of perforations are arranged on the first plate and the second plate, and a tube bundle is arranged in each perforation, the tube bundle penetrates through the whole spiral baffle, and support tube plates are arranged at both ends of the tube bundle, and the outer wall of the support tube plate is connected with the inner wall of the shell.

[0013] Preferably, a plurality of distance rods are arranged between each support tube plate and the nearest second plate, so that the second plate and the flow guide part are in the same spiral curve.

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

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

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

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

[0018] (1) By arranging the shell, the end cover, the first water inlet, the second water inlet, the first water outlet, the second water outlet, the support tube plate and the tube bundle, the liquid in the shell is first communicated between the first water inlet and the second water outlet, and then communicated between the second water inlet and the first water outlet, so that the liquid in the shell is in an alternating injection mode, which is used to drive the dynamic anti-fouling device to move back and forth along the spiral channel at the edge of the spiral baffle, and the mutual cooperation between the rolling ball, the limiting plate, the threaded column, the sleeve, the pushing piece, the rotating piece, the sleeve ring and the elastic scraper can scrape off the scale on the connection between the spiral baffle and the inner wall of the shell, the tube bundle close to the inner wall of the shell and the area with low axial flow speed and high radial speed, so as to avoid the accumulation of scale and the formation of fouling, and the impurities can flow out of the water outlet along the water flow, the fluid distribution in the shell is optimized, the fouling accumulation is prevented, the local flow channel is prevented from being blocked, the spiral flow in the shell is more uniform, the "dead zone" is avoided, the degree of turbulence is strengthened, the heat exchange efficiency is improved, the probability of the heat insulation layer formed by the fouling on the tube bundle at the edge is reduced, the heat exchange efficiency is further improved, the electrochemical corrosion of the metal surface under the fouling is reduced, the structure is prevented from being damaged, the equipment deformation or leakage problem caused by local overheating or stress concentration due to fouling accumulation is reduced, and the equipment maintenance cycle is prolonged.

[0019] (2) The pusher, the receiving plate and the fan blade are arranged, the action force of water flow is utilized to move, no additional power source is needed, the structure is simple, the operation is reliable, the maintenance cost is lower than that of traditional manual cleaning, the flow channel is effectively ensured to be in a smooth state for a long time, the shell side pressure loss is reduced, the external pump power consumption is reduced, the energy consumption cost can be further reduced, the cooperation between the cover plate, the spring and the rope makes the water pressure open the receiving plate on the one end of the water receiving action force in the dynamic anti-fouling device, under the action of the fan blade, the spiral channel moves and rotates itself, drives the elastic wiper to clean, on the other end of the water receiving action force, the spring can fold the pusher to the maximum through the rope, the resistance is reduced, and the overall cleaning efficiency is further improved, the application utilizes the innovative design of "passive fluid driving + dynamic contact cleaning", integrates the anti-fouling and cleaning functions in the heat exchanger structure, improves the energy efficiency and reduces the operation and maintenance cost, and ensures the long-period stable operation of the equipment.

[0020] (3) The connecting parts of the first plate, the second plate and the third plate are welded to combine into baffle plate assemblies, and the baffle plate assemblies are sequentially welded at the head and tail to form a spiral baffle plate, so that the overall assembly step is optimized under the premise of ensuring the characteristics of different plates. Since the cross section of the first plate is a trapezoidal structure, the thickness in the radial direction of the shell gradually decreases, so that the problem of high axial flow velocity and low radial velocity at the central axis of the shell can be better addressed without affecting the radial flow intensity of the water flow, the wear resistance of the middle position of the baffle plate is improved, the impact resistance, wear resistance and stability of the spiral baffle plate as a whole are improved, the guide part of the third plate has a curved surface structure, which can improve the corner formed by the existing spiral curved surface of the baffle plate and the inner wall of the shell, the flow direction of the fluid changes suddenly at the corner, causing low axial flow velocity and high radial velocity, reducing the influence caused by the sudden change, and utilizing the Venturi effect under the cooperation of the adjusting hole, further improving the axial flow velocity at the corner, facilitating the pushing of the dynamic anti-fouling device, and reducing the attachment of impurity particles at the corner.

[0021] The application will be explained in detail below in combination with the drawings and specific embodiments. SCHEMATIC DRAWINGS

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

[0023] Figure 2 It is an exploded schematic diagram of the overall structure of the application;

[0024] Figure 3 It is an exploded schematic diagram of the spiral baffle plate of the application;

[0025] Figure 4An exploded view of the baffle plate assembly of the present application;

[0026] Figure 5 An exploded view of the dynamic anti-fouling device of the present application;

[0027] Figure 6 An illustration of the adjustment hole structure in the third plate of the present application;

[0028] Figure 7 A plan view of the baffle plate assembly of the present application;

[0029] Figure 8 A plan view of the dynamic anti-fouling device of the present application.

[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 plate assembly; 21, first plate; 22, second plate; 23, third plate; 231, connecting portion; 232, flow guide portion; 233, adjustment hole; 234, guide rail; 24, perforation; 3, dynamic anti-fouling device; 31, rolling ball; 32, limiting plate; 33, threaded column; 34, sleeve; 35, pushing member; 351, receiving plate; 352, fan blade; 36, cover plate; 37, spring; 38, rotating member; 381, sleeve ring; 382, elastic scraper; 4, support tube plate; 5, distance rod; 6, tube bundle. DETAILED DESCRIPTION

[0031] In order to facilitate the understanding of the present application, the present application will be described more fully below in connection with the accompanying drawings, in which several embodiments of the present application are shown. The present application may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that this disclosure will be thorough and complete, and fully convey the scope of the application to those skilled in the art.

[0032] It should be noted that when an element is referred to as being "on" another element, it can be directly on the other element or intervening elements can also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements can also be present. As used herein, the terms "vertical", "horizontal", "left", "right", and the like are used for explanation purposes only.

[0033] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in the description of the application herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used herein, the term "and / or" includes any and all combinations of one or more of the associated listed items.

[0034] Embodiment one, please refer to the attached Figures 1-8 As shown in the figure, a centerless tube continuous helical baffle heat exchanger, comprising an external structure 1, the external structure 1 comprises a shell 11 and located at both ends of the shell 11 end cover 12, end cover 12 and shell 11 between the detachable connection, the shell 11 is provided with a plurality of baffle assembly 2, the adjacent baffle assembly 2 between the head and tail in turn welded to form a helical baffle, each of the baffle assembly 2 comprises by the axis outwardly in turn arranged first plate 21, second plate 22 and third plate 23, the third plate 23 includes connecting part 231 and guide part 232, and the guide part 232 and the shell 11 inner wall connection, can be welded, the gap between the connecting part 231 and the guide part 232 constitutes the circular cross section of the guide rail 234, the circular cross section design, ensure that the internal space is large, both sides of the opening is narrow, one is to ensure the stability of the movement of the ball 31 in the guide rail 234, two is because the surface tension and viscosity of water in the narrow mouth of the resistance to hinder the role of significant, resulting in water difficult to flow into, ensure the smoothness of the ball 31 movement, at the same time reduce the water from the guide rail 234 out, so that the flow direction of water disorder, each third plate 23 on the guide rail 234 head and tail communication constitutes a complete spiral channel; the spiral channel is provided with a dynamic anti scale device 3, the dynamic anti scale device 3 includes the ball 31, the ball 31 and the guide rail 234 is movably connected, the both sides of the ball 31 is provided with a limiting plate 32, and the limiting plate 32 is located on both sides of the third plate 23, each of the limiting plate 32 is provided with a threaded column 33 and the rotating part 38 on the threaded column 33, the rotating part 38 is used for cleaning the scale layer of the third plate 23 and the shell 11 inner wall connection.

[0035] By the above structure, in the process of heat exchange, the alternating water injection mode can be used to avoid the problem of scale accumulation at the connection between the continuous helical baffle and the inner wall of the shell 11, optimize the fluid distribution, prevent the accumulation of scale from causing local flow passage blockage, make the spiral flow in the shell more uniform, avoid the formation of "dead zones", strengthen the degree of turbulent flow, greatly improve the heat exchange efficiency, and also reduce the probability of the formation of an insulating layer on the tube bundle 6 at the edge due to scale accumulation, further improve the heat exchange efficiency, while reducing the case of electrochemical corrosion of the metal surface under the scale (such as oxygen concentration cell), preventing structural damage, reducing the problem of equipment deformation or leakage caused by local overheating or stress concentration due to scale accumulation, prolonging the equipment overhaul period (from 1-2 years to 3-5 years), and using water flow to drive self-cleaning without additional power source (such as motor, hydraulic system), simple structure and reliable operation, maintenance cost is lower than traditional manual cleaning (such as mechanical scraping, chemical cleaning), due to long-term smooth flow passage, shell pressure loss is reduced, external pump power consumption is reduced, further reducing energy consumption cost, the "passive fluid driven + dynamic contact cleaning" innovative design of the present application integrates the scale prevention and cleaning functions into the heat exchanger structure, which improves the energy efficiency, reduces the operation and maintenance cost, and ensures the long-term stable operation of the equipment.

[0036] The specific operation is as follows: the liquid in the tube is entered by an end cover 12, then passes through the tube bundle 6, and flows out from the other end cover 12, the shell is entered from the first water inlet 13 (or the second water inlet 14), passes through the helical baffle between the two support tube plates 4, and then flows out from the second water outlet 16 (or the first water outlet 15), in the process of communication between the first water inlet 13 and the second water outlet 16, the water flow will flow along the helical baffle, and the water force will push the pusher 35 on the side of the dynamic anti-scale device 3 facing the first water inlet 13, the pusher 35 stretches the spring 37 through the rope, and the pusher 35 on the other side is maximally folded under the action of the spring 37 and the water flow (i.e. when the adjacent pushers 35 interfere with each other), under the action of the water, the dynamic anti-scale device 3 moves along the spiral surface, i.e. the rolling ball 31 moves in the spiral channel formed by the guide rail 234, and under the action of the fan blade 352, the rolling ball 31 rotates during movement, so as to drive the elastic scraper 382 to act on the guide flow part 232 and the connection between the inner wall of the shell 11 and the tube bundle 6 close to the inner wall of the shell 11, reduce the particle adhesion, and avoid 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 inlet 14 and the first outlet 15 are connected. At this time, under the action of the spring 37 and the water flow, the previously closed pusher 35 opens and the previously opened pusher 35 closes, so that the whole device moves in the opposite direction. Then the above steps are repeated, and the dynamic anti-fouling device 3 can move back and forth in a spiral to clean and prevent particles from adhering and forming scale.

[0038] Example 2, please refer to the appendix for details. Figure 2 , 3 As shown in Figures 4 and 6, the connecting portion 231 of the first plate 21, the second plate 22, and the third plate 23 is welded. Multiple through holes 24 are provided on both the first plate 21 and the second plate 22. A tube bundle 6 is installed within each through hole 24, penetrating the entire spiral baffle. Support tube plates 4 are provided at both ends of the tube bundle 6, and the outer edges of the support tube plates 4 are connected to the inner wall of the shell 11. The cooperation between the tube bundle 6 and the support tube plates 4 ensures the stability of the spiral baffle. Multiple spacer rods 5 are provided between the support plate 4 and the nearest second plate 22. These spacer rods 5 achieve positioning and spacing of the spiral baffle, further improving the stability of the spiral baffle and ensuring that the second plate 22 and the guide section 232 are within the same spiral surface. This allows the guide rail 234 to form a stable spiral channel. The first plate 21 has a trapezoidal cross-section, and its thickness gradually decreases from the central axis of the spiral baffle outwards. This is achieved by increasing the thickness of the first plate 21 at the central axis position of the housing 11. To improve impact resistance and wear resistance, the connecting part 231 is provided with multiple sets of adjustment holes 233, with two adjustment holes 233 in each set facing opposite directions. Each adjustment hole 233 has an isosceles trapezoidal cross-section. The adjustment holes 233 utilize the Venturi effect to further increase the axial flow velocity at the corner. Furthermore, on the narrow side of the adjustment hole 233, the surface tension and viscous resistance of water significantly impede the flow, reducing water inflow from the narrow side and preventing interference. This ensures the flow at the first inlet 13 and... When the second outlet 16 is connected, the regulating hole 233 facing the same side plays a role in speeding up the flow, while 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 inlet 13 and a second inlet 14, and the lower side of the outer wall of the shell 11 is provided with a first outlet 15 and a second outlet 16. Through the cooperation between the first inlet 13 and the second outlet 16, the second inlet 14 and the first outlet 15, the alternating forward and reverse flow of water in the shell is realized.

[0039] Example 3, please refer to the appendix for details. Figure 3 and 5As shown, the rotating member 38 comprises a sleeve 381 on the threaded column 33 and a plurality of elastic scrapers 382 evenly distributed around the outer wall of the sleeve 381, which realizes the cleaning of the impurity particles on the connecting part of the flow guide part 232 and the inner wall of the shell 11 and the tube bundle 6 close to the inner wall of the shell 11, avoiding adhesion. The threaded column 33 is connected with a sleeve 34, and the sleeve 34 is hinged with a plurality of pushers 35. 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 blade 352 is evenly distributed around the central axis of the sleeve 34. The receiving plate 351 is used to receive the force of water to provide a forward thrust to the whole device, and the fan blade 352 promotes the rotation of the whole device. The spiral surface provided by the helical baffle further promotes the rotation of the whole device to a certain extent, thereby ensuring the feasibility of the rotation and scraping of the elastic scraper 382. The opening of the sleeve 34 is provided with a cover plate 36 with a through hole, and the cavity formed by the cover plate 36 and the opening of the sleeve 34 is provided with a spring 37. One end of the spring 37 passes through the through hole of the cover plate 36 through a rope and is connected with the interface on each pusher 35. By pulling the rope with the spring 37, the pusher 35 on the side not in use can be folded to the maximum extent, that is, when the interference between every two adjacent receiving plates 351 occurs.

[0040] The above describes the application with reference to the drawings, and it is obvious that the specific implementation of the application is not limited by the above method. Any non-essential improvement or direct application of the concept and technical solution of the application to other occasions is within the protection scope of the application.

Claims

1. A central tube-free continuous helical baffle heat exchanger, comprising an outer structure (1), the outer structure (1) comprising 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 plate assemblies (2) being arranged in the shell (11), the adjacent baffle plate assemblies (2) being sequentially welded end to end to form helical baffles, characterized in that Each of the baffle plate assemblies (2) comprises a first plate member (21), a second plate member (22) and a third plate member (23) arranged outwardly along an axis, the third plate member (23) comprises a connecting portion (231) and a flow guiding portion (232), the flow guiding portion (232) is connected with an inner wall of the shell (11), and a gap between the connecting portion (231) and the flow guiding portion (232) forms a guide rail (234) with a circular cross section, the guide rails (234) on each of the third plate members (23) are connected in a loop to form a complete spiral channel. A dynamic anti-fouling device (3) is arranged in the spiral channel, the dynamic anti-fouling device (3) comprises a rolling ball (31), the rolling ball (31) is movably connected with the guide rail (234), and limiting plates (32) are arranged on both sides of the rolling ball (31), and the limiting plates (32) are located on both sides of the third plate member (23), a threaded column (33) and a rotating member (38) on the threaded column (33) are arranged on each of the limiting plates (32), and the rotating member (38) is used for cleaning a scale layer at a connecting position of the third plate member (23) and the inner wall of the shell (11).

2. A center pipe free continuous helical baffle heat exchanger according to claim 1, characterized in that, The rotating member (38) comprises a sleeve ring (381) and a plurality of elastic scraping blades (382), the sleeve ring (381) is arranged on the threaded column (33), and the elastic scraping blades (382) are distributed at equal intervals on an outer wall of the sleeve ring (381).

3. A center pipe free continuous helical baffle heat exchanger according to claim 2, characterized in that, A sleeve (34) is connected to the threaded column (33), a plurality of pushing members (35) are hingedly connected to the sleeve (34), each of the pushing members (35) comprises a receiving plate (351) and a fan blade (352), the fan blade (352) is arranged on the receiving plate (351), and the fan blades (352) are distributed at equal intervals around a central axis of the sleeve (34).

4. A center pipe free continuous helical baffle heat exchanger according to claim 3, characterized in that, A cover plate (36) with a through hole is arranged at an opening of the sleeve (34), a spring (37) is arranged in a cavity formed by the cover plate (36) and the opening of the sleeve (34), and one end of the spring (37) is connected with an interface on each of the pushing members (35) through a rope passing through the through hole of the cover plate (36).

5. A center pipe free continuous helical baffle heat exchanger according to claim 1, characterized in that, The connecting portions (231) of the first plate member (21), the second plate member (22) and the third plate member (23) are welded, a plurality of perforations (24) are arranged on the first plate member (21) and the second plate member (22), a tube bundle (6) is arranged in each of the perforations (24), the tube bundle (6) penetrates through the entire spiral baffle plate, support tube plates (4) are arranged at both ends of the tube bundle (6), and outer walls of the support tube plates (4) are connected with the inner wall of the shell (11).

6. A center pipe free continuous helical baffle heat exchanger according to claim 5, characterized in that, A plurality of distance rods (5) are arranged between each of the support tube plates (4) and the nearest second plate member (22), so that the second plate member (22) and the flow guiding portion (232) are located in the same spiral curved surface.

7. A center pipe free continuous helical baffle heat exchanger according to claim 5, characterized in that, The first plate member (21) has a trapezoidal cross section, and the thickness gradually decreases outwardly from a central axis of the spiral baffle plate.

8. A center pipe free continuous helical baffle heat exchanger according to claim 5, characterized in that, A plurality of adjusting holes (233) are arranged around the connecting portion (231), and each group of two adjusting holes (233) are oppositely directed, and each of the adjusting holes (233) has an isosceles trapezoidal cross section.

9. A center pipe free continuous helical baffle heat exchanger according to claim 5, characterized in that, The outer wall of the shell (11) is provided with a first water inlet (13) and a second water inlet (14) on the upper side, and is provided with a first water outlet (15) and a second water outlet (16) on the lower side.

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