Heat exchange shell-and-tube heat exchanger and method

Abstract

This invention relates to the field of heat exchanger technology, and more particularly to a shell-and-tube heat exchanger device and method for heat exchange, comprising a shell, with tube sheets fixedly installed at the front and rear ends of the shell, and a plurality of heat exchange tubes arranged in an array running through the outer surfaces of the front and rear tube sheets. Heat exchange fluid flow sections are respectively provided on opposite sides of two tube sheets. An inlet pipe is fixedly installed at the front end of the lower surface of the shell, and a drain pipe is installed at the rear end of the upper surface of the shell. A plurality of baffles are fixedly installed on the inner wall of the shell, guiding the fluid to form an S-shaped flow trajectory. A stepped plate is provided behind each baffle. This invention drives the stepped plate to reciprocate, which can ensure normal heat exchange without interfering with the S-shaped flow channel, and can also progressively disturb the stagnation area behind the baffles, and, in conjunction with the flow channel, agitate and mix the liquid inside the shell, eliminating the drawbacks of fluid stagnation.

Description

Technical Field

[0001] This invention relates to the field of heat exchanger technology, and more particularly to a shell-and-tube heat exchange device and method for heat exchange. Background Technology

[0002] Shell-and-tube heat exchangers are core equipment in the field of industrial fluid heat exchange. With their robust structure, high heat exchange efficiency, and wide adaptability, they are widely used in chemical, HVAC, and industrial temperature control industries. Ethylene glycol aqueous solutions, as a commonly used antifreeze heat exchange medium, possess characteristics such as low freezing point, good fluidity, and excellent thermal stability. They are often used in shell-and-tube heat exchangers to complete heating and heat exchange operations, making them widely suitable for industrial equipment cooling circulation, low-temperature environment heating, and process fluid temperature control.

[0003] Existing shell-and-tube heat exchangers typically have baffles fixedly installed inside. These baffles alter the flow direction of the shell-side fluid, causing the ethylene glycol aqueous solution to form an S-shaped zigzag flow within the shell, thus extending the fluid's heat exchange path and improving the adequacy of heat exchange between the hot water in the tubes and the ethylene glycol aqueous solution in the shell. However, during long-term continuous operation, the obstructing effect of the baffles can create dead zones on their back side, causing the solution to easily form a static stagnant layer behind the baffles, preventing it from rapidly renewing with the mainstream fluid.

[0004] Meanwhile, due to gravity and fluid flow inertia, the innermost shell region, located at the rear bottom of the shell and below the corresponding drain pipe, is a high-risk area for liquid stagnation. The fluid velocity in this region is extremely low, remaining stagnant or semi-stagnant for extended periods. The mainstream heat exchange fluid cannot effectively flush and cover this area, resulting in a persistent fluid stagnation zone.

[0005] The aforementioned two fluid retention issues can lead to numerous equipment malfunctions. The stagnant ethylene glycol aqueous solution, if not refreshed over a long period, causes the medium's heat exchange temperature to become constant, preventing efficient heat exchange and significantly reducing the overall heat exchange efficiency of the equipment, thus increasing heating energy consumption. Furthermore, the long-term static retention of the ethylene glycol aqueous solution easily breeds impurities and slight scaling, adhering to the inner wall of the shell, baffles, and the surface of the heat exchange tubes, further reducing the fluid flow space and weakening the heat transfer coefficient. Long-term operation can easily cause equipment blockage and heat exchange failure. Therefore, a shell-and-tube heat exchanger and method for heat exchange are proposed. Summary of the Invention

[0006] The purpose of this invention is to address the shortcomings of the prior art by proposing a shell-and-tube heat exchanger and method for heat exchange.

[0007] To achieve the above objectives, the technical solution adopted by the present invention is as follows: a shell-and-tube heat exchanger, comprising a shell, tube sheets fixedly installed at the front and rear ends of the shell, a plurality of heat exchange tubes arranged in an array passing through the outer surfaces of the front and rear tube sheets, heat exchange liquid flow sections respectively provided on the opposite sides of the two tube sheets, an inlet pipe fixedly provided at the front end of the lower surface of the shell, a drain pipe provided at the rear end of the upper surface of the shell, a plurality of baffles fixedly provided on the inner wall of the shell, the plurality of baffles guiding the fluid to form an S-shaped flow trajectory, and a stepped plate provided behind each baffle;

[0008] The stepped plate includes a middle plate, a waist plate, and a side plate arranged sequentially from the center to the inner wall along the radial direction of the shell. The middle plate and the waist plate, as well as the waist plate and the side plate, are slidably connected. The front surface of the middle plate is slidably fitted with the baffle plate.

[0009] The inner wall of the housing has a rotating ring at the rear end via a drive mechanism. The inner wall of the rotating ring has a guide rail and a plurality of flow-diverting grooves arranged in a ring array. The flow-diverting grooves are positioned to avoid the guide rail.

[0010] Several of the stepped plates move synchronously through a connecting frame, with the rear end of the connecting frame slidingly engaging with the guide rail.

[0011] Preferably, the heat exchange fluid flow section includes end caps fixedly installed on opposite sides of two tube sheets. A water inlet pipe is fixedly connected to the lower surface of the front end cap, and a drain pipe is fixedly connected to the upper surface of the rear end cap. Flange joints are fixedly provided at the ports of the water inlet pipe, drain pipe, liquid inlet pipe, and liquid outlet pipe. Several support seats are fixedly installed on the lower surface of the shell.

[0012] Preferably, the end cap and the tube sheet are respectively fixedly provided with splicing flanges, and the outer surfaces of the two contacting splicing flanges are connected by a number of mounting bolts, and the ends of the mounting bolts are threaded with mounting nuts.

[0013] Preferably, the middle plate and waist plate are provided with convex grooves on the side away from the central axis of the shell, and the waist plate and side plate are respectively fixedly provided with convex blocks on the side close to the central axis of the shell, and the convex blocks are slidably inserted into the inner side of the convex grooves.

[0014] Preferably, a plurality of T-shaped rods are fixedly provided on the rear surface of the baffle plate, and a T-shaped groove is provided through the front surface of the middle plate, wherein the T-shaped rods slide through the inner side of the T-shaped groove.

[0015] Preferably, the drive mechanism includes a thickened portion disposed at the rear end of the outer surface of the housing. The inner wall of the thickened portion has an annular groove. The outer surface of the rotating ring is rotatably fitted into the inner side of the annular groove. A transmission gear ring is disposed at the front of the rotating ring. A disc-shaped groove is disposed inside the thickened portion and near the front end of the annular groove. A drive gear is rotatably fitted into the inner side of the disc-shaped groove. The drive gear meshes with the transmission gear ring. The central shaft of the drive gear is fixedly connected to the output shaft of the drive motor. The drive motor is fixedly disposed on the outer surface of the thickened portion by a mounting base.

[0016] Preferably, the connecting frame includes an axial plate fixedly connected to the rear surface edge of each side plate, and two adjacent upper and lower axial plates are fixedly connected by an arc plate. Both the axial plate and the arc plate are in sliding contact with the inner wall of the shell.

[0017] Preferably, a movable strip is fixedly connected to the rear surface of the last arc-shaped plate, and a guide ball is fixedly provided at the rear end of the lower surface of the movable strip. The guide ball slides into the inner side of the guide rail, which is spiral-shaped and symmetrically arranged on both sides with the movable strip as the center.

[0018] A heat exchange method using a shell-and-tube heat exchanger includes the following steps:

[0019] S1. Heat source water is introduced into the heat exchange fluid flow section at the front, and the liquid to be heated is introduced into the liquid inlet pipe.

[0020] S2. Periodically control the rotating ring through the drive mechanism. The flow channel disturbs and drives the fluid to flow upward. At the same time, the connecting frame moves backward and pulls the stepped plate, causing the middle plate, waist plate and side plate to be radially misaligned, pushing the liquid behind the baffle and reducing liquid retention.

[0021] Compared with the prior art, the present invention has the following beneficial effects:

[0022] 1. This invention, through the cooperation of a drive mechanism, a rotating ring, a guide rail, and a connecting frame, can drive the stepped plate to retract periodically. Due to the structural characteristics of the middle plate, waist plate, and side plate sliding together in stages, a stepped distribution structure is automatically formed after retraction, which is adapted to the fluid distribution characteristics of the stagnant area behind the baffle plate. It effectively disturbs the area with the most severe stagnant flow on the inner wall of the shell, and can periodically disperse the stagnant liquid accumulated behind the baffle plate, thus solving the problem of medium stagnation.

[0023] 2. Under normal heat exchange conditions, the stepped plate moves forward as a whole to fit the rear surface of the baffle, forming a flat plate structure. This will not block or interfere with the S-shaped fluid flow trajectory formed by the baffle, effectively preserving the original heat exchange stroke and heat exchange efficiency, and ensuring stable operation of the equipment under normal heat exchange conditions.

[0024] 3. In the process of the drive mechanism driving the rotating ring, guide rail and stepped plate to move synchronously, the flow channel rotates synchronously with the rotating ring, which can forcibly agitate the liquid inside the shell, change the flow state of the liquid inside the shell, promote the upward movement of the liquid in the lower part of the shell and the downward movement of the liquid in the upper part of the shell, effectively improve the problem of slow liquid flow and long-term stagnation and accumulation in the low-position area at the rear end of the shell, and realize the full mixing and circulation of the liquid inside the shell. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the structure of a shell-and-tube heat exchanger according to the present invention;

[0026] Figure 2 This is a cross-sectional view of a shell-and-tube heat exchanger according to the present invention.

[0027] Figure 3 This is a cross-sectional view of the shell of a shell-and-tube heat exchanger according to the present invention.

[0028] Figure 4 This invention relates to a shell-and-tube heat exchanger for heat exchange. Figure 3 Enlarged view of point A in the middle;

[0029] Figure 5 This is a cross-sectional view of the stepped plate section of a shell-and-tube heat exchanger according to the present invention.

[0030] Figure 6 This invention relates to a shell-and-tube heat exchanger for heat exchange. Figure 5 Enlarged view at point B in the middle;

[0031] Figure 7 This is a schematic diagram of the stepped plate component of a shell-and-tube heat exchanger according to the present invention.

[0032] Figure 8 This is a cross-sectional view of the rotating ring of a shell-and-tube heat exchanger according to the present invention.

[0033] Figure 9 This is a cross-sectional view of the thickened portion of a shell-and-tube heat exchanger according to the present invention.

[0034] The components are as follows: 1. Shell; 2. Tube sheet; 3. End cap; 4. Heat exchange tube; 5. Baffle plate; 6. Middle plate; 7. Waist plate; 8. Side plate; 9. Convex groove; 10. Convex block; 11. T-shaped rod; 12. T-slot; 13. Axial plate; 14. Arc plate; 15. Rotating ring; 16. Flow channel; 17. Guide rail; 18. Moving bar; 19. Guide ball; 20. Transmission gear ring; 21. Ring groove; 22. Drive gear; 23. Drive motor; 24. Mounting base; 25. Thickened part; 26. Splicing flange; 27. Mounting bolt; 28. Mounting nut; 29. ​​Support base; 30. Liquid inlet pipe; 31. Water inlet pipe; 32. Drain pipe; 33. Drain pipe; 34. Flange joint; 35. Disc-shaped groove. Detailed Implementation

[0035] The following description is intended to disclose the invention and enable those skilled in the art to implement it. The preferred embodiments described below are merely examples, and other obvious variations will occur to those skilled in the art.

[0036] like Figures 1-9 The heat exchanger shown includes a shell 1, with tube sheets 2 fixedly installed at the front and rear ends of the shell 1. Several heat exchange tubes 4 are arranged in an array and pass through the outer surfaces of the front and rear tube sheets 2. Heat exchange liquid flow sections are respectively provided on the opposite sides of the two tube sheets 2. An inlet pipe 30 is fixedly installed at the front end of the lower surface of the shell 1, and a drain pipe 33 is provided at the rear end of the upper surface of the shell 1. Several baffles 5 are fixedly installed on the inner wall of the shell 1. The baffles 5 guide the fluid to form an S-shaped flow trajectory. A stepped plate is provided behind each baffle 5.

[0037] The stepped plate includes a middle plate 6, a waist plate 7 and a side plate 8 arranged in sequence from the center to the inner wall along the radial direction of the shell 1. The middle plate 6 and the waist plate 7, as well as the waist plate 7 and the side plate 8, are slidably connected. The front surface of the middle plate 6 is slidably fitted with the baffle 5.

[0038] The inner rear end of the housing 1 is provided with a rotating ring 15 via a drive mechanism. The inner wall of the rotating ring 15 is provided with a guide rail 17 and a number of flow-diverting grooves 16 arranged in a ring array. The flow-diverting grooves 16 are positioned to avoid the guide rail 17.

[0039] Several stepped plates move synchronously through a connecting frame, with the rear end of the connecting frame slidingly engaging with the guide rail 17.

[0040] The heat exchange fluid flow section includes end caps 3 fixedly installed on opposite sides of two tube sheets 2. The two end caps 3 and the corresponding tube sheets 2 form a closed tube cavity space for the entry, exit and diversion / collection of hot water medium. The lower surface of the front end cap 3 is fixedly connected to a water inlet pipe 31, and the upper surface of the rear end cap 3 is fixedly connected to a drain pipe 32. The ports of the water inlet pipe 31, drain pipe 32, liquid inlet pipe 30 and liquid outlet pipe 33 are respectively fixedly provided with flange joints 34. Through the flange joints 34, each pipeline can be quickly connected and sealed to the external conveying pipeline. Several support seats 29 are fixedly installed on the lower surface of the shell 1, which can provide stable support and load-bearing function for the overall heat exchange equipment.

[0041] The edge of the end cap 3 and the tube sheet 2 are respectively fixed with splicing flanges 26. Several mounting bolts 27 are passed through the outer surface of the two contacting splicing flanges 26. The end of the mounting bolt 27 is threaded with a mounting nut 28. The mounting bolt 27 and the mounting nut 28 are used to lock the splicing flanges 26 and ensure stable connection between them.

[0042] The middle plate 6 and the waist plate 7 are respectively provided with convex grooves 9 on the side away from the central axis of the housing 1. The waist plate 7 and the side plate 8 are respectively fixedly provided with convex blocks 10 on the side close to the central axis of the housing 1. The convex blocks 10 slide into the inner side of the convex grooves 9. This ensures that the middle plate 6 and the waist plate 7, and the waist plate 7 and the side plate 8 can slide relative to each other.

[0043] Several T-shaped rods 11 are fixedly installed on the rear surface of the baffle plate 5, and a T-shaped groove 12 is opened through the front surface of the middle plate 6. The T-shaped rods 11 slide through the inner side of the T-shaped groove 12. The T-shaped rods 11 can limit the rearward movement of the middle plate 6 and prevent the middle plate 6 from moving backward and falling off.

[0044] The drive mechanism includes a thickened portion 25 located at the rear end of the outer surface of the housing 1. An annular groove 21 is formed on the inner wall of the thickened portion 25. The outer surface of a rotating ring 15 is rotatably fitted into the inner side of the annular groove 21. An annular seal is provided at the rotational fit gap between the annular groove 21 and the rotating ring 15 to ensure the rotating ring 15 can rotate while preventing leakage of the medium inside the housing 1. A transmission gear ring 20 is provided at the front of the rotating ring 15. A disc-shaped groove 35 is formed inside the thickened portion 25 near the front end of the annular groove 21. A drive gear 22 is rotatably fitted into the inner side of the disc-shaped groove 35. The drive gear 22 meshes with the transmission gear ring 20. The central shaft of the drive gear 22 is fixedly connected to the output shaft of the drive motor 23. The drive motor 23 is fixedly mounted on the outer surface of the thickened portion 25 via a mounting base 24. The disc-shaped groove 35 provides space for the drive gear 22, and the mounting base 24 ensures the stable installation of the drive motor 23. The thickened portion 25 is used to improve the local structural rigidity of the housing 1 and to provide a reliable mounting base for the annular groove 21 and the drive gear 22.

[0045] The connecting frame includes an axial plate 13 fixedly connected to the rear surface edge of each side plate 8. Adjacent upper and lower axial plates 13 are fixedly connected by an arc plate 14. Both the axial plate 13 and the arc plate 14 slide in contact with the inner wall of the housing 1, further improving the stability of the axial plate 13 and the arc plate 14 during movement.

[0046] The rear surface of the final arc plate 14 is fixedly connected to a moving strip 18. A guide ball 19 is fixedly installed at the rear end of the lower surface of the moving strip 18. The guide ball 19 slides into the inner side of the guide rail 17. The guide rail 17 is spiral-shaped and symmetrically arranged on both sides with the moving strip 18 as the center. This allows the rotating ring 15 to drive the moving strip 18 to accurately complete a full-range switching of forward or backward movement through the spiral guide rail 17 trajectory every half rotation.

[0047] A heat exchange method for a shell-and-tube heat exchanger is also proposed, using the aforementioned heat exchanger, and includes the following steps:

[0048] S1. Heat source water is introduced into the heat exchange fluid flow section at the front, and the liquid to be heated is introduced into the liquid inlet pipe 30.

[0049] S2. Periodically control the rotating ring 15 through the drive mechanism to disturb the flow channel 16 and drive the fluid to flow upward. At the same time, the connecting frame moves backward and pulls the stepped plate, causing the middle plate 6, waist plate 7, and side plate 8 to be radially misaligned, pushing the liquid behind the baffle plate 5 and reducing liquid stagnation.

[0050] During use, liquid is introduced into the shell 1 through the liquid inlet pipe 30, and after heat exchange, it is discharged through the liquid outlet pipe 33; hot water is introduced through the water inlet pipe 31, flows through the front end cap 3, exchanges heat with the liquid inside the shell 1 through the heat exchange pipe 4, and then flows to the rear end cap 3, and is finally discharged through the drain pipe 32.

[0051] The drive motor 23 drives the drive gear 22 to rotate, which in turn drives the transmission gear ring 20 to rotate, causing the rotating ring 15 to rotate half a revolution. The guide ball 19 slides relative to the inside of the guide rail 17, which drives the moving bar 18 to move forward. The axial plate 13 and the arc plate 14 move forward synchronously with the moving bar 18, thereby driving each side plate 8 to move forward synchronously. During the forward movement of the side plate 8, the convex block 10 on it slides to the front end of the convex groove 9 of the waist plate 7, which in turn drives the waist plate 7 to move forward. Similarly, the waist plate 7 continues to move forward, which in turn drives the middle plate 6 to move forward synchronously. Finally, the middle plate 6, waist plate 7, and side plate 8 combine to form a vertical flat plate structure, which fits against the rear surface of the baffle plate 5 and does not interfere with the S-shaped flow path of the liquid. This state is the normal working state of liquid heat exchange.

[0052] Under normal heat exchange conditions, the drive motor 23 can be periodically started to make the rotating ring 15 rotate half a turn again. The guide rail 17 drives the moving bar 18 to move backward, which in turn drives the side plate 8, waist plate 7, and middle plate 6 to retract backward in sequence. After the three retract, they are arranged in a stepped manner. The retraction action disturbs the liquid retention area behind the baffle plate 5. The retraction displacement of the side plate 8, waist plate 7, and middle plate 6 decreases step by step to meet the disturbance requirements of the retention area. The fluid retention phenomenon is most serious near the inner wall of the shell 1. The retraction action of this stepped structure can effectively solve the liquid retention problem behind the baffle plate 5.

[0053] Each time the drive motor 23 runs, the flow channel 16 simultaneously agitates the fluid, causing the lower liquid to flow upward and the upper liquid to flow downward, thus enhancing the mixing of the fluid inside the shell 1. This prevents the fluid from stagnating at the lower rear end of the shell 1 for a long time, and prevents problems such as scaling, local overheating, or heat exchange efficiency reduction caused by local medium stagnation.

[0054] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed invention. The scope of protection claimed by the appended claims and their equivalents is defined.

Claims

1. A shell-and-tube heat exchanger, comprising a shell (1), characterized in that: Tube sheets (2) are fixedly installed at the front and rear ports of the shell (1). Several heat exchange tubes (4) arranged in an array are connected through the outer surfaces of the front and rear tube sheets (2). Heat exchange liquid flow parts are respectively provided on the opposite sides of the two tube sheets (2). An inlet pipe (30) is fixedly provided at the front end of the lower surface of the shell (1). A drain pipe (33) is provided at the rear end of the upper surface of the shell (1). Several baffles (5) are fixedly provided on the inner wall of the shell (1). Several baffles (5) guide the fluid to form an S-shaped flow trajectory. A stepped plate is provided behind each baffle (5). The stepped plate includes a middle plate (6), a waist plate (7) and a side plate (8) arranged in sequence from the center to the inner wall along the radial direction of the shell (1). The middle plate (6) and the waist plate (7) are slidably connected, and the waist plate (7) and the side plate (8) are slidably fitted. The front surface of the middle plate (6) is slidably fitted with the baffle plate (5). The inner wall of the housing (1) is provided with a rotating ring (15) via a drive mechanism at the rear end. The inner wall of the rotating ring (15) is provided with a guide rail (17). The inner wall of the rotating ring (15) is provided with a plurality of flow-diverting grooves (16) arranged in a ring array. The flow-diverting grooves (16) are positioned to avoid the guide rails (17). Several of the stepped plates move synchronously through a connecting frame, and the rear end of the connecting frame slides into the guide rail (17).

2. The shell-and-tube heat exchanger according to claim 1, characterized in that: The heat exchange fluid flow section includes end caps (3) that are fixedly installed on opposite sides of two tube sheets (2). A water inlet pipe (31) is fixedly connected to the lower surface of the front end cap (3), and a drain pipe (32) is fixedly connected to the upper surface of the rear end cap (3). Flange joints (34) are fixedly installed at the ports of the water inlet pipe (31), drain pipe (32), liquid inlet pipe (30), and liquid outlet pipe (33). Several support seats (29) are fixedly installed on the lower surface of the shell (1).

3. The shell-and-tube heat exchanger according to claim 2, characterized in that: The edge of the end cap (3) and the tube sheet (2) are respectively fixed with splicing flanges (26), and the outer surfaces of the two splicing flanges (26) that are in contact are connected by a number of mounting bolts (27), and the end of the mounting bolt (27) is threaded with a mounting nut (28).

4. The shell-and-tube heat exchanger according to claim 1, characterized in that: The middle plate (6) and waist plate (7) are respectively provided with convex grooves (9) on the side away from the central axis of the shell (1). The waist plate (7) and side plate (8) are respectively fixedly provided with convex blocks (10) on the side close to the central axis of the shell (1). The convex blocks (10) slide into the inner side of the convex grooves (9).

5. A shell-and-tube heat exchanger according to claim 1, characterized in that: The rear surface of the baffle plate (5) is fixedly provided with several T-shaped rods (11), and the front surface of the middle plate (6) is provided with a T-shaped groove (12) through which the T-shaped rods (11) slide through the inner side of the T-shaped groove (12).

6. A shell-and-tube heat exchanger according to claim 1, characterized in that: The drive mechanism includes a thickened part (25) disposed at the rear end of the outer surface of the housing (1). The inner wall of the thickened part (25) is provided with an annular groove (21). The outer surface of the rotating ring (15) is rotatably fitted into the inner side of the annular groove (21). A transmission gear ring (20) is provided at the front of the rotating ring (15). A disc-shaped groove (35) is provided inside the thickened part (25) and near the front end of the annular groove (21). A drive gear (22) is rotatably fitted into the inner side of the disc-shaped groove (35). The drive gear (22) meshes with the transmission gear ring (20). The central shaft of the drive gear (22) is fixedly connected to the output shaft of the drive motor (23). The drive motor (23) is fixedly disposed on the outer surface of the thickened part (25) through a mounting base (24).

7. A shell-and-tube heat exchanger according to claim 1, characterized in that: The connecting frame includes an axial plate (13) fixedly connected to the rear surface edge of each side plate (8), and two adjacent upper and lower axial plates (13) are fixedly connected by an arc plate (14). Both the axial plate (13) and the arc plate (14) are in sliding contact with the inner wall of the shell (1).

8. A shell-and-tube heat exchanger according to claim 7, characterized in that: The rear surface of the arc plate (14) is fixedly connected to a moving strip (18), and a guide ball (19) is fixedly provided at the rear end of the lower surface of the moving strip (18). The guide ball (19) slides into the inner side of the guide rail (17). The guide rail (17) is spiral-shaped and symmetrically arranged on both sides with the moving strip (18) as the center.

9. A heat exchange method for a shell-and-tube heat exchanger, comprising using the heat exchanger as described in any one of claims 1-8, characterized in that: Includes the following steps: S1. Heat source water is introduced into the heat exchange liquid flow section in front, and the liquid to be heated is introduced into the liquid inlet pipe (30); S2. Periodically control the rotating ring (15) through the drive mechanism, and the flow channel (16) disturbs and drives the fluid to flow upward. At the same time, the connecting frame moves backward and pulls the stepped plate, causing the middle plate (6), waist plate (7), and side plate (8) to be radially misaligned, pushing the liquid behind the baffle plate (5) and reducing liquid retention.

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