Chemical heat exchange apparatus and method

Abstract

This invention relates to the field of shell-and-tube heat exchange technology, and more particularly to a heat exchange device and method for chemical applications. The device includes a main shell and a heat exchange mechanism disposed inside the main shell. Two symmetrically arranged gas collecting chambers are fixedly embedded in the upper surface of the main shell. An upper baffle is fixedly installed on the inner top surface of the main shell. The upper end of the upper baffle is engaged with the edge of the two gas collecting chambers. A fixed cylinder is fixedly inserted through the upper surface of each gas collecting chamber. A first float and a second float are disposed inside the gas collecting chamber, and the first float and the second float are slidably engaged vertically. A connecting plate is fixedly disposed on the side of the first float near the fixed cylinder. One side of the connecting plate is slidably attached to the surface of the upper baffle. This invention can efficiently discharge an arc-shaped gas film, simultaneously achieving exhaust and preventing accidental liquid discharge. Exhaust is timely and pressure control is not required.

Description

Technical Field

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

[0002] Shell-and-tube heat exchangers are core equipment in the brine preheating process in industries such as chlor-alkali chemical and salt production. Their working principle is as follows: the brine to be preheated is introduced into the shell side of the shell, and the heating medium is introduced into the tube side of the heat exchange tube bundle. The two fluids exchange heat through the heat exchange tube wall, heating the brine to the process temperature required for electrolysis and evaporation.

[0003] Air dissolved in the brine and air introduced through the pipes will continue to be released during the heating process. Since the density of non-condensable gas is much smaller than that of brine, it will continue to float under the influence of gravity, forming a continuous and heat-insulating gas film along the arc-shaped inner top wall of the horizontal shell. This can easily lead to the complete isolation of the heat exchange tubes from the brine in this area, resulting in a significant decrease in heat exchange efficiency and a severely uneven overall temperature distribution in the shell side.

[0004] The conventional solution in the existing technology is to open an exhaust port at the top of the shell to discharge the gas film. However, the exhaust port can only discharge gas in a local area and cannot cover the entire arc-shaped gas film extending along the axis. The gas film will still stagnate and accumulate in areas such as the opposite side of the exhaust port and around the water outlet, and it is easy to accidentally discharge the internal liquid, causing leakage risk. There is also a solution of using a pressure relief valve for venting, but it relies on pressure to open. When the shell side pressure does not reach the threshold when the gas film is formed, it cannot vent in time, and the venting effect is poor. Summary of the Invention

[0005] The purpose of this invention is to address the shortcomings of the prior art by proposing a heat exchange device and method for chemical applications.

[0006] To achieve the above objectives, the technical solution adopted by the present invention is as follows: a heat exchange device for chemical applications, comprising a main shell and a heat exchange mechanism disposed inside the main shell. Two symmetrically arranged gas collecting chambers are fixedly embedded in the upper surface of the main shell. An upper baffle is fixedly installed on the inner top surface of the main shell. The upper end of the upper baffle is engaged with the edge of the two gas collecting chambers. A fixed cylinder is fixedly inserted through the upper surface of each gas collecting chamber. A first float and a second float are disposed inside the gas collecting chamber. The first float and the second float slide vertically together. The first float is positioned close to the fixed cylinder. On one side, a connecting plate is fixedly installed on the surface of the first float near the fixed cylinder. One side of the connecting plate slides against the surface of the upper baffle. A connecting cylinder is fixedly installed on the upper surface of the connecting plate. The connecting cylinder slides through the inner side of the fixed cylinder. An exhaust hole is opened on the side of the fixed cylinder near the first float, and the exhaust hole is close to the inner top surface of the gas collection chamber. A columnar cavity is opened on the inner side of the connecting cylinder. A strip-shaped opening communicating with the exhaust hole is opened on one side of the columnar cavity. A scraper is provided on the inner side of the columnar cavity and the strip-shaped opening. An air flotation mechanism is provided on the upper surface of the scraper. When the gas is collected on the inner top surface of the gas collection chamber to form a gas film, the upper surfaces of the first float and the second float remain flush under the action of the liquid buoyancy in the main shell. As the air film is gradually discharged through the exhaust port, the upper surfaces of the first float and the second float successively come into contact with the top surface of the air collection chamber. After the gas film is discharged, the lower end of the strip-shaped opening is higher than the height of the exhaust hole, thus closing the exhaust channel.

[0007] Preferably, the heat exchange mechanism includes end caps fixedly connected to both ends of the main housing. An end cap plate is fixedly installed at the port of each end cap. A plurality of heat exchange tubes are fixedly passed through the end cap plates on both sides. The heat exchange tubes are slidably connected to the lower baffle and the upper baffle. An outlet pipe is fixedly connected to the upper surface of one end cap, and an inlet pipe is fixedly connected to the lower surface of the other end cap. A discharge pipe is fixedly connected to the upper surface of the main housing near the outlet pipe, and an inlet pipe is fixedly connected to the lower surface of the main housing near the inlet pipe.

[0008] Preferably, a limiting block is fixedly connected to the lower surface of the connecting plate, and the limiting block is in contact with the outer surface of the uppermost heat exchange tube.

[0009] Preferably, the upper end of the upper baffle is fixedly connected to an extension, and anti-overflow flanges are fixedly provided on both sides of the upper surface of the extension. A bent edge is fixedly connected to the side of the gas collection chamber near the extension. The bent edge is fitted onto the edge of the extension and the anti-overflow flange, and the sides of the two bent edges are in close contact.

[0010] Preferably, the side of the gas collection chamber away from the bent edge and the front and rear edges are fixedly connected to a mounting plate. Several threaded posts slide through the upper surface of the mounting plate. The lower end of each threaded post is fixedly connected to the upper surface of the main housing, and the upper end of each threaded post is threaded with a mounting nut.

[0011] Preferably, a sliding cavity is formed on the surface of the first float near the second float, and a sliding plate is fixedly connected to the surface of the second float near the first float. The sliding plate slides into the inner side of the sliding cavity, and a guide post is fixedly connected to the inner side of the sliding cavity. The guide post slides through the surface of the sliding plate.

[0012] Preferably, the upper surfaces of the first float and the second float are fixedly connected with a number of guide ribs, and the inner top surface of the gas collection chamber is provided with a number of flow guide grooves. After the first float and the second float float rise, the guide ribs are inserted into the inner side of the flow guide grooves.

[0013] Preferably, the air flotation mechanism includes a connecting rod fixedly connected to the upper surface of the scraper, the upper end of the connecting rod extending to the outside of the fixed cylinder and fixedly connected to a floating plate, and two inserts fixedly connected to the lower surface of the floating plate on both sides respectively. The lower end of the insert is slidably inserted into the upper end face of the fixed cylinder, and a shaking spring is sleeved on the outer surface of the insert. The shaking spring is located between the fixed cylinder and the floating plate, and the upper port of the columnar cavity is flared.

[0014] A heat exchange method for chemical applications is also proposed, using the aforementioned heat exchange device, and includes the following steps: S1. The liquid flowing through the main shell is heated by a heat exchange mechanism; S2. During the continuous heat exchange process, the gas film formed on the top surface of the main shell enters the gas collection chamber and converges, and then passes through the exhaust hole, strip-shaped opening and columnar cavity in sequence to reach the fixed cylinder and is discharged from the upper port of the fixed cylinder. S3. During shutdown maintenance, the scraper is lifted and removed by raising the air flotation mechanism to clean the inside of the columnar cavity and strip-shaped opening, preventing the flow channel from becoming blocked.

[0015] Compared with the prior art, the present invention has the following beneficial effects: 1. This invention effectively solves the problem that existing exhaust methods cannot cover the entire arc-shaped gas film. By collecting the gas in the gas collection chamber, the first float and the second float push the gas film step by step, achieving efficient exhaust of the gas film, avoiding the heat exchange tube being isolated by the gas film, and improving the uneven temperature distribution of the shell side. 2. This invention achieves simultaneous gas film discharge and liquid anti-misdischarge. By using the first float to move the connecting cylinder, the strip-shaped opening is made higher than the exhaust port to automatically seal the liquid, avoiding the risk of leakage caused by the accidental discharge of liquid from the exhaust port and improving the safety of equipment operation. 3. This invention does not rely on pressure threshold for venting and can vent in a timely manner in the early stage of gas film formation, solving the pain point of untimely venting and poor effect of pressure relief valve; 4. This invention is suitable for the working scenarios of shell and tube heat exchangers, without the need for major modifications to the original equipment, and is suitable for brine preheating processes in industries such as chlor-alkali chemical industry and salt production. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of a heat exchange device for chemical industry according to the present invention; Figure 2 This is a cross-sectional view of a heat exchange device for chemical applications according to the present invention; Figure 3 This invention relates to a heat exchange device for chemical applications. Figure 2 Enlarged view of point A in the middle; Figure 4 This invention relates to a heat exchange device for chemical applications. Figure 3 Enlarged view at point B in the middle; Figure 5 This is a cross-sectional view of the gas collecting chamber of a chemical heat exchange device according to the present invention; Figure 6 This invention relates to a heat exchange device for chemical applications. Figure 5 Enlarged view at point C; Figure 7 This invention relates to a heat exchange device for chemical applications. Figure 5 Enlarged view at point D; Figure 8 This is a cross-sectional view of the main casing of a heat exchange device for chemical use according to the present invention; Figure 9 This is a schematic diagram of the gas collection chamber of a heat exchange device for chemical applications according to the present invention.

[0017] The components are as follows: 1. Main shell; 2. End cap; 3. Inlet pipe; 4. Outlet pipe; 5. Inlet pipe; 6. Outlet pipe; 7. End cap plate; 8. Lower baffle plate; 9. Upper baffle plate; 10. Extension section; 11. Gas collection chamber; 12. Bending edge; 13. Anti-overflow flange; 14. Mounting plate; 15. Threaded post; 16. Mounting nut; 17. First float; 18. Second float; 19. Sliding cavity; 20. Sliding plate; 21. Guide post; 22. Guide ridge; 23. Connecting plate; 24. Restricting block; 25. Connecting cylinder; 26. Fixed cylinder; 27. Exhaust hole; 28. Columnar cavity; 29. ​​Strip-shaped opening; 30. Flange; 31. Scraper; 32. Connecting rod; 33. Float; 34. Insert post; 35. Vibrating spring; 36. Heat exchange tube; 37. Guide groove. Detailed Implementation

[0018] 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.

[0019] like Figures 1-9 The illustrated heat exchange equipment for chemical applications includes a main shell 1 and a heat exchange mechanism disposed inside the main shell 1. Two symmetrically arranged gas collecting chambers 11 are fixedly embedded in the upper surface of the main shell 1. An upper baffle 9 is fixedly installed on the inner top surface of the main shell 1, and the upper end of the upper baffle 9 is engaged with the edge of the two gas collecting chambers 11. A fixed cylinder 26 is fixedly inserted through the upper surface of the gas collecting chambers 11. A first float 17 and a second float 18 are disposed inside the gas collecting chambers 11, and the first float 17 and the second float 18 are vertically slidably engaged. The first float 17 is closer to the side of the fixed cylinder 26. A connecting plate 23 is fixedly installed on one side of the surface of the 6. One side of the connecting plate 23 slides against the surface of the upper baffle 9. A connecting cylinder 25 is fixedly installed on the upper surface of the connecting plate 23. The connecting cylinder 25 slides through the inner side of the fixed cylinder 26. An exhaust hole 27 is opened on the side of the fixed cylinder 26 near the first float 17. The exhaust hole 27 is close to the inner top surface of the gas collection chamber 11. A columnar cavity 28 is opened on the inner side of the connecting cylinder 25. A strip-shaped opening 29 communicating with the exhaust hole 27 is opened on one side of the columnar cavity 28. A scraper 31 is provided on the inner side of the columnar cavity 28 and the strip-shaped opening 29. An air flotation mechanism is provided on the upper surface of the scraper 31. When the gas is collected on the inner top surface of the gas collection chamber 11 to form a gas film, the upper surfaces of the first float 17 and the second float 18 remain flush under the action of the liquid buoyancy in the main shell 1. As the air film is gradually discharged through the exhaust port 27, the upper surfaces of the first float 17 and the second float 18 successively come into contact with the inner top surface of the air collection chamber 11. After the gas film is discharged, the lower end of the strip-shaped opening 29 is higher than the height of the exhaust port 27, thus closing the exhaust channel.

[0020] The first float 17 and the second float 18 are made of fiberglass-reinforced PP material, which is a low-density, high-temperature resistant, corrosion-resistant, and non-absorbent material. They can float stably even when solid. They are easy to process.

[0021] The heat exchange mechanism includes end caps 2 fixedly connected to both ends of the main shell 1. An end cap plate 7 is fixedly installed at the port of each end cap 2. Several heat exchange tubes 36 are fixedly connected and pass through the two end cap plates 7. The heat exchange tubes 36 are slidably connected to the lower baffle plate 8 and the upper baffle plate 9. An outlet pipe 4 is fixedly connected to the upper surface of one end cap 2, and an inlet pipe 3 is fixedly connected to the lower surface of the other end cap 2. A discharge pipe 6 is fixedly connected to the upper surface of the main shell 1 near the outlet pipe 4, and an inlet pipe 5 is fixedly connected to the lower surface of the main shell 1 near the inlet pipe 3. The entire structure forms a fluid heat exchange flow structure, achieving efficient heating of the brine.

[0022] A limiting block 24 is fixedly connected to the lower surface of the connecting plate 23, and the limiting block 24 is in contact with the outer surface of the uppermost heat exchange tube 36. The limiting block 24 is made of wear-resistant and high-temperature resistant material, and forms a limit through surface contact to restrict the downward movement distance of the connecting plate 23.

[0023] An extension 10 is fixedly connected to the upper end of the upper baffle 9. An anti-overflow flange 13 is fixedly provided on both sides of the upper surface of the extension 10. A bent edge 12 is fixedly connected to the side of the gas collection chamber 11 near the extension 10. The bent edge 12 is fitted onto the edge of the extension 10 and the anti-overflow flange 13, effectively improving the sealing degree. The sides of the two bent edges 12 are in close contact to form a sealed fit structure.

[0024] The side of the gas collecting chamber 11 away from the bent edge 12 and the front and rear edges are fixedly connected to the mounting plate 14. The mounting plate 14 is integrally welded to the outer wall of the gas collecting chamber 11, which has a compact structure and high connection strength. Several threaded posts 15 slide through the upper surface of the mounting plate 14. The lower end of the threaded post 15 is fixedly connected to the upper surface of the main housing 1. The upper end of the threaded post 15 is threaded with a mounting nut 16, which realizes the stable assembly between the gas collecting chamber 11 and the main housing 1, and facilitates subsequent disassembly and maintenance.

[0025] A sliding cavity 19 is provided on the surface of the first float 17 near the second float 18 to provide sufficient space for relative sliding. A sliding plate 20 is fixedly connected to the surface of the second float 18 near the first float 17. The sliding plate 20 slides into the inner side of the sliding cavity 19, and the two fit smoothly without jamming. A guide post 21 is fixedly connected to the inner side of the sliding cavity 19. The guide post 21 slides through the surface of the sliding plate 20 and plays a guiding and limiting role for the sliding plate 20, ensuring that the first float 17 and the second float 18 do not deviate or misalign when moving relative to each other.

[0026] The upper surfaces of both the first float 17 and the second float 18 are fixedly connected with several guide ribs 22. The inner top surface of the gas collecting chamber 11 is provided with several flow guide grooves 37. After the first float 17 and the second float 18 float upwards, the guide ribs 22 engage with the inner side of the flow guide grooves 37, preventing interference with the upward movement of the first float 17 and the second float 18. The flow guide grooves 37 guide the gas film, allowing the gas to flow orderly along the extension direction of the flow guide grooves 37, preventing localized gas accumulation and ensuring stable convergence.

[0027] The air flotation mechanism includes a connecting rod 32 fixedly connected to the upper surface of the scraper 31. The upper end of the connecting rod 32 extends to the outside of the fixed cylinder 26 and is fixedly connected to a float 33. Insert pins 34 are fixedly connected to both sides of the lower surface of the float 33. The lower ends of the insert pins 34 slide into the upper surface of the fixed cylinder 26, facilitating smooth insertion and providing guidance and limiting. A vibration spring 35 is sleeved on the outer surface of the insert pins 34, located between the fixed cylinder 26 and the float 33, providing elastic reset and slight vibration for the float 33. The upper port of the columnar cavity 28 has a flared opening 30. The float 33 is made of glass fiber reinforced PP or PVDF material, which is resistant to high temperatures and salt water vapor corrosion, has low density, and possesses sufficient rigidity and lightweight characteristics.

[0028] The scraper 31 is designed to be thin, with a low travel distance and a thin thickness. The scraper 31 and the floating plate 33 are an integrated linkage structure. The floating plate 33 itself has a certain weight, which can form a reliable downward pressure constraint on the scraper 31. At the same time, the airflow is mainly discharged upward, and the upward blowing force on the scraper 31 is limited. Therefore, during the exhaust process, the scraper 31 can always maintain a working state of being in contact with the inner wall of the columnar cavity 28 and the strip-shaped opening 29, and will not be blown up by the airflow.

[0029] A heat exchange method for chemical applications is also proposed, using the aforementioned heat exchange device, and includes the following steps: S1. The liquid flowing through the main shell 1 is heated by a heat exchange mechanism; S2. During the heat exchange process, the gas film formed on the top surface of the main shell 1 enters the gas collection chamber 11 and converges, and then passes through the exhaust hole 27, the strip-shaped opening 29, and the columnar cavity 28 in sequence to reach the fixed cylinder 26 and is discharged from the upper port of the fixed cylinder 26. S3. During shutdown maintenance, the scraper 31 is moved upward and removed by lifting the air flotation mechanism to clean the inside of the columnar cavity 28 and the strip-shaped opening 29 to prevent the flow channel from being blocked.

[0030] During use, the heating medium is introduced through the inlet pipe 3. After flowing through the inside of one end cap 2, the medium enters the other end cap 2 through the heat exchange pipe 36 and is then discharged through the outlet pipe 4. The brine is introduced through the inlet pipe 5 and flows under the guidance of the lower baffle plate 8 and the upper baffle plate 9. It is heated through the heat exchange pipe 36 and discharged through the outlet pipe 6.

[0031] The gas generated during heating rises and enters the arc-shaped gas collecting chamber 11, forming a gas film on the top surface of the chamber. The gas film then passes through the exhaust port 27, the strip-shaped opening 29, and the columnar cavity 28 into the fixed cylinder 26, and is discharged from the inside of the fixed cylinder 26. As the gas film is discharged, the liquid level in the main shell 1 rises, and under the action of buoyancy, the first float 17 and the second float 18 move upward synchronously.

[0032] The upper surface of the second float 18 first contacts the bottom surface of the gas collecting chamber 11, pushing the gas film on that side towards the fixed cylinder 26, further assisting in the discharge of the gas film. As the float continues to rise, the first float 17 continues to move upward relative to the second float 18, and the sliding plate 20 slides down along the inner side of the sliding cavity 19 until the upper surface of the first float 17 is in contact with the top surface of the gas collecting chamber 11. At this time, the first float 17 and the second float 18 occupy the space on the top surface of the gas collecting chamber 11, pushing the gas film out, achieving the effect of step-by-step pushing and efficient removal of the gas film. At the same time, after the connecting cylinder 25 moves upward synchronously with the first float 17, the strip-shaped opening 29 is higher than the exhaust hole 27, which automatically seals the liquid inside, preventing the problem of liquid discharge.

[0033] When the gas is discharged through the fixed cylinder 26, the airflow causes the floating plate 33 to move slightly up and down. The vibrating spring 35 not only supports the floating plate 33 but also enhances the continuity of its movement. During the up and down movement of the floating plate 33, the scraper 31 slides synchronously along the inner wall of the columnar cavity 28 and the strip-shaped opening 29, scraping off the salt deposits attached to the lower end of the inner wall. This prevents the accumulation of deposits on the inner wall from affecting cleanliness or causing channel blockage. The flared opening 30 can assist a small amount of condensed water to flow back into the columnar cavity 28. It should be noted that the water vapor temperature is relatively high during the exhaust process, and the phenomenon of condensed water and salt deposits on the inner wall is relatively mild. The main function of the scraper 31 is to prevent the formation of stable deposits. During regular maintenance, the floating plate 33 is raised, allowing the scraper 31 to be removed and cleaned of the accumulated clumps on the surface. The inner bottom surfaces of the columnar cavity 28 and the strip-shaped opening 29 are also rinsed and wiped. Because the scraper 31 continuously scrapes during use, the clumps and impurities accumulated near the inner bottom surface of the columnar cavity 28 are not stubborn, making the cleaning operation simple.

[0034] 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 heat exchange device for chemical industry, comprising a main shell (1) and a heat exchange mechanism arranged inside the main shell (1), characterized in that: Two symmetrically arranged gas collecting chambers (11) are fixedly embedded on the upper surface of the main housing (1). An upper baffle plate (9) is fixedly installed on the inner top surface of the main housing (1). The upper end of the upper baffle plate (9) is engaged with the edge of the two gas collecting chambers (11). A fixed cylinder (26) is fixedly inserted through the upper surface of the gas collecting chamber (11). A first float (17) and a second float (18) are arranged on the inner side of the gas collecting chamber (11). The first float (17) and the second float (18) slide vertically together. A connecting plate (23) is fixedly arranged on the side surface of the first float (17) near the fixed cylinder (26). One side of the connecting plate (23) is connected to the upper baffle plate. The surfaces of the plates (9) slide against each other. A connecting cylinder (25) is fixedly provided on the upper surface of the connecting plate (23). The connecting cylinder (25) slides through the inner side of the fixed cylinder (26). An exhaust hole (27) is provided on the side of the fixed cylinder (26) near the first float (17). The exhaust hole (27) is close to the inner top surface of the gas collecting chamber (11). A columnar cavity (28) is provided on the inner side of the connecting cylinder (25). A strip-shaped opening (29) communicating with the exhaust hole (27) is provided on one side of the columnar cavity (28). A scraper (31) is provided on the inner side of the columnar cavity (28) and the strip-shaped opening (29). An air flotation mechanism is provided on the upper surface of the scraper (31). When the gas is collected on the inner top surface of the gas collection chamber (11) to form a gas film, the upper surfaces of the first float (17) and the second float (18) remain flush under the action of the liquid buoyancy in the main shell (1); During the process of the gas film being gradually discharged through the exhaust hole (27), after the upper surface of the second float (18) is in contact with the top surface inside the gas collecting chamber (11), the upper surface of the first float (17) is in contact with the top surface inside the gas collecting chamber (11). After the gas film is discharged, the lower end of the strip-shaped opening (29) is higher than the height of the exhaust hole (27), thus closing the exhaust channel; During shutdown maintenance, the scraper (31) is moved up and removed by lifting the air flotation mechanism to clean the inside of the columnar cavity (28) and the strip-shaped opening (29) to prevent the flow channel from being blocked.

2. The heat exchange apparatus for chemical industry according to claim 1, characterized in that: The heat exchange mechanism includes end caps (2) fixedly connected to both ends of the main shell (1). Each end cap (2) has an end cap plate (7) fixedly installed at its port. Several heat exchange tubes (36) are fixedly connected between the two end cap plates (7). The heat exchange tubes (36) are slidably connected to the lower baffle (8) and the upper baffle (9). The upper surface of one end cap (2) is fixedly connected to the liquid outlet pipe (4), and the lower surface of the other end cap (2) is fixedly connected to the liquid inlet pipe (3). The upper surface of the main shell (1) and the side near the liquid outlet pipe (4) is fixedly connected to the discharge pipe (6), and the lower surface of the main shell (1) and the side near the liquid inlet pipe (3) is fixedly connected to the inlet pipe (5).

3. The heat exchange apparatus for chemical industry according to claim 2, characterized in that: A limiting block (24) is fixedly connected to the lower surface of the connecting plate (23), and the limiting block (24) is in contact with the outer surface of the uppermost heat exchange tube (36).

4. The heat exchange apparatus for chemical industry according to claim 1, characterized in that: The upper end of the upper baffle (9) is fixedly connected to an extension (10). An anti-overflow flange (13) is fixedly provided on both sides of the upper surface of the extension (10). A bent edge (12) is fixedly connected to the side of the gas collection chamber (11) near the extension (10). The bent edge (12) is fitted on the edge of the extension (10) and the anti-overflow flange (13). The sides of the two bent edges (12) are in close contact.

5. A heat exchange apparatus for chemical industry as claimed in claim 4 wherein: The gas collection chamber (11) is fixedly connected to a mounting plate (14) on the side away from the bent edge (12) and along the front and rear edges. Several threaded posts (15) slide through the upper surface of the mounting plate (14). The lower end of the threaded post (15) is fixedly connected to the upper surface of the main housing (1). The upper end of the threaded post (15) is threaded with a mounting nut (16).

6. A heat exchange apparatus for chemical industry according to claim 1, characterized in that: The first float (17) has a sliding cavity (19) on the side surface near the second float (18). The second float (18) has a sliding plate (20) fixedly connected to the side surface near the first float (17). The sliding plate (20) slides into the inner side of the sliding cavity (19). The inner side of the sliding cavity (19) is fixedly connected to a guide post (21). The guide post (21) slides through the surface of the sliding plate (20).

7. A heat exchange apparatus for chemical industry as claimed in claim 1 wherein: The upper surfaces of the first float (17) and the second float (18) are fixedly connected with several guide ribs (22). The inner top surface of the gas collection chamber (11) is provided with several guide grooves (37). When the first float (17) and the second float (18) float up to the point where the upper surfaces of the first float (17) and the second float (18) are in contact with the inner top surface of the gas collection chamber (11), the guide ribs (22) are inserted into the inner side of the guide grooves (37).

8. A heat exchange apparatus for chemical industry as claimed in claim 1 wherein: The air flotation mechanism includes a connecting rod (32) fixedly connected to the upper surface of the scraper (31). The upper end of the connecting rod (32) extends to the outside of the fixed cylinder (26) and is fixedly connected to a float (33). Inserts (34) are fixedly connected to both sides of the lower surface of the float (33). The lower end of the insert (34) is slidably inserted into the upper surface of the fixed cylinder (26). A shaking spring (35) is sleeved on the outer surface of the insert (34). The shaking spring (35) is located between the fixed cylinder (26) and the float (33). The upper port of the columnar cavity (28) is provided with a flared opening (30).

9. A method of heat exchange for chemical engineering, using the heat exchange apparatus according to any one of claims 1 to 8, characterized in that: Includes the following steps: S1. The liquid flowing through the main shell (1) is heated by a heat exchange mechanism; S2. During the heat exchange process, the gas film formed on the top surface of the main shell (1) enters the gas collection chamber (11) and converges, and then passes through the exhaust hole (27), strip-shaped opening (29), and columnar cavity (28) to reach the fixed cylinder (26) and is discharged from the upper port of the fixed cylinder (26). S3. During shutdown maintenance, the scraper (31) is moved up and removed by lifting the air flotation mechanism to clean the inside of the columnar cavity (28) and the strip-shaped opening (29) to prevent the flow channel from being blocked.

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