A glass tube heat exchanger adapted to contain sulfur trioxide

Abstract

The application discloses a glass tube heat exchanger suitable for containing sulfur trioxide, and particularly relates to the technical field of sulfuric acid preparation heat exchange, and discloses a glass tube heat exchanger suitable for containing sulfur trioxide, characterized in that the heat exchanger comprises a heat exchanger main frame, a bottom of the heat exchanger main frame is provided with a through port for sulfur trioxide vapor entering and sulfuric acid liquid flowing out, a top of the heat exchanger main frame is provided with a process gas outlet, and an inner portion of the heat exchanger main frame is provided with a heat exchange cavity; an inner portion of the heat exchange cavity is provided with a detachable and modular heat exchange module; the sulfur trioxide vapor passing through the heat exchange module is subjected to heat exchange through a cooling medium circulating in the heat exchange module; the PFA lining and the modified PTFE spraying hole plate can effectively improve the sulfuric acid corrosion resistance of the heat exchanger; the detachable and modular heat exchange module is easy to install and deploy in various spaces, and when maintenance is performed, the faulty module can be quickly positioned and replaced, so that the downtime is significantly shortened, and the production continuity is effectively ensured.

Description

Technical Field

[0001] This invention relates to the field of heat exchange technology for sulfuric acid preparation, specifically to a glass tube heat exchanger adapted to sulfur trioxide. Background Technology

[0002] In many fields, such as chemical production, heat exchange processes involving sulfuric acid are frequently encountered. Due to the highly corrosive nature of sulfuric acid, ordinary heat exchangers are easily damaged upon contact with it, leading to shortened equipment lifespan, increased maintenance costs, and severely impacting the continuity and stability of production. Traditional metal heat exchangers are ill-suited for long-term operation in sulfuric acid environments. While some corrosion-resistant metal materials are expensive, even with these materials, corrosion remains a significant challenge under harsh conditions such as high concentrations and temperatures. Existing non-metallic heat exchangers suffer from low heat exchange efficiency and inconvenient installation and maintenance, failing to adequately meet the practical needs of industrial production. Therefore, we propose a glass tube heat exchanger and method adapted to sulfur trioxide-containing environments to address these issues. Summary of the Invention

[0003] The purpose of this invention is to provide a glass tube heat exchanger and method adapted to sulfur trioxide, so as to solve the problems mentioned in the background art.

[0004] To achieve the above objectives, the present invention provides the following technical solution: a glass tube heat exchanger adapted to sulfur trioxide, characterized in that: the heat exchanger includes a heat exchanger main frame, the bottom of the heat exchanger main frame is provided with an inlet for sulfur trioxide vapor to enter and sulfuric acid liquid to flow down, the top of the heat exchanger main frame is provided with a process gas outlet, the heat exchanger main frame is provided with a heat exchange chamber inside, the heat exchange chamber is provided with a detachable modular heat exchange module inside, and the sulfur trioxide vapor passing through the heat exchange module is heat exchanged through a cooling medium flowing inside the heat exchange module;

[0005] The heat exchange module includes a glass heat exchange tube, the middle part of which is suspended and in contact with sulfur trioxide vapor.

[0006] The glass heat exchange tube is hollow in the middle along the axial direction, and the diameter of the end of the glass heat exchange tube gradually decreases. The glass heat exchange tube includes heat transfer blades in the hollow part and heat transfer chambers in the outer ring part.

[0007] The heat transfer blades extend along the axial direction and are provided with a mixing connection hole that penetrates the heat transfer blades. The interior of the heat exchange chamber is hollow and vacuum-sealed. The end of the heat exchange chamber is spiral-shaped and adapted to the end of the glass heat exchange tube. The heat exchange chamber is filled with a vaporized cooling medium. Inside the heat exchange chamber, there is a liquid suction core for guiding the cooling medium toward the middle of the glass heat exchange tube.

[0008] The heat exchanger main frame is provided with a first conveying line for conveying cooling medium into the glass heat exchange tubes and a second conveying line for cooling the ends of the glass heat exchange tubes.

[0009] Preferably, the heat exchange module further includes modified PTFE sprayed perforated plates on both sides, the modified PTFE sprayed perforated plates are provided with inwardly penetrating mounting ears, the mounting ears are fitted with PFA tube sleeves and welded on both sides, the glass heat exchange tubes are inserted into the PFA tube sleeves, and the ends of the glass heat exchange tubes extend out of the modified PTFE sprayed perforated plates.

[0010] The end of the modified PTFE sprayed perforated plate contacts the inner wall of the heat exchanger main frame, forming an inner annular channel for heat exchange of sulfur trioxide vapor, and the inner ring formed by the contact between the heat exchanger main frame and the modified PTFE sprayed perforated plate is lined with PFA.

[0011] Preferably, the upper part of the heat exchanger main frame is provided with two sets of heat exchange chambers, and the lower part of the heat exchanger main frame is provided with an inverted triangular collection chamber. The bottom of the heat exchange chamber is connected to the top of the collection chamber, and the bottom of the collection chamber is connected to the opening.

[0012] The collection chamber is equipped with a sealing partition plate that can individually close the heat exchange chamber. The sealing partition plate is located in the middle of the opening, and all heat exchange chambers are in an open state.

[0013] Preferably, a drive shaft is rotatably connected inside the collection cavity, the sealing partition plate is installed on the drive shaft, the lower part of the collection cavity is provided with an arc-shaped part that matches the rotation trajectory of the outer ring of the sealing partition plate, and the upper end of the collection cavity is provided with a limiting inner protrusion that limits the rotation of the sealing partition plate.

[0014] Preferably, the heat exchanger main frame includes a top end plate bolted to the top and a mounting plate bolted to the front of the upper part of the heat exchanger main frame. Both the mounting plate and the top end plate are provided with PFA lining at the contact points with sulfur trioxide vapor.

[0015] Preferably, the second conveying line includes an air inlet chamber located at the bottom of the heat exchanger main frame, which supplies air from bottom to top, the air inlet chamber being located outside the collection chamber, and an output port located at the top of the heat exchanger main frame;

[0016] A U-shaped cooling chamber is formed between the outer side of the heat exchange module and the inner wall of the heat exchanger main frame. The air inlet chamber is connected to the bottom of one end of the cooling chamber, and the outlet is connected to the top of the other end of the cooling chamber.

[0017] Preferably, the first conveying line includes a transfer conveying chamber located on the left and right sides of the heat exchanger main frame, a central chamber located between the two sets of heat exchange chambers, and a connecting assembly for connecting the glass heat exchange tube to the transfer conveying chamber and the central chamber respectively. The upper part of the outer side of the transfer conveying chamber is provided with an input slot, and the lower part of the rear side of the central chamber is provided with an output slot.

[0018] Preferably, the connecting assembly includes a diverting cone, a connecting pipe, a positioning joint, a connecting sleeve, and a connecting head.

[0019] The positioning joint is installed on the inner wall of the heat exchanger main frame and is connected to the transfer chamber and the central chamber respectively. The two ends of the connecting sleeve are threaded to the positioning joint and the connecting head respectively. The connecting head is installed on the outer side of the flow divider cone and the connecting pipe is installed on the inner side of the flow divider cone.

[0020] Preferably, the end of the connecting pipe is inserted into the end of the glass heat exchange tube, and a mounting connecting post is installed on the outside of the mounting ear hole. The flow divider cone is installed on the end of the mounting connecting post by bolts, and a rubber sealing gasket is provided at the insertion point. The connecting pipe and the connector are both connected to the inside of the flow divider cone.

[0021] Both ends of the connecting sleeve are provided with inwardly recessed threaded mounting ring holes, and the ends of the connecting pipe and the connector extend into the threaded mounting ring holes and are threadedly connected to the connecting sleeve.

[0022] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0023] 1. This glass tube heat exchanger, adapted to sulfur trioxide, effectively improves its resistance to sulfuric acid corrosion through PFA lining and modified PTFE sprayed perforated plates. Its detachable modular heat exchange modules make it easy to install and deploy in various spaces. During maintenance, faulty modules can be quickly located and replaced, significantly reducing downtime and ensuring production continuity.

[0024] 2. This glass tube heat exchanger, adapted to sulfur trioxide, achieves multiple heat exchange effects through the cooperation of the cooling medium inside the heat exchange chamber, heat transfer blades, and mixing connection holes. Furthermore, the cooling medium inside the heat exchange chamber prevents the temperature of the subsequent cooling medium in the glass heat exchange tube from becoming too high, thereby improving the heat exchange efficiency. Attached Figure Description

[0025] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0026] Figure 1 This is a schematic diagram of the structure of the present invention;

[0027] Figure 2 This is a schematic diagram of the rear view structure in this invention;

[0028] Figure 3 This is a schematic diagram of the structure when viewed from the front in this invention;

[0029] Figure 4 This is a schematic diagram of the structure in the frontal cross-section of the present invention;

[0030] Figure 5 This is a top view of the opened structure in this invention;

[0031] Figure 6 This is a schematic diagram of the heat exchange module connection structure in this invention;

[0032] Figure 7 This is a cross-sectional structural schematic diagram of the glass heat exchange tube in this invention;

[0033] Figure 8 This is a schematic diagram of the external cross-section of the glass heat exchange tube in this invention;

[0034] Figure 9 This is a schematic diagram of the heat exchange chamber in this invention;

[0035] Figure 10 This is a schematic diagram of the connection structure of the sealing partition plate in this invention;

[0036] Figure 11 This is a schematic diagram showing the cross-sectional view of the heat exchange module connection in this invention;

[0037] Figure 12 This is a schematic diagram of the modified PTFE spraying orifice plate connection in this invention;

[0038] Figure 13 This is a schematic diagram of the structure at point A in this invention;

[0039] Figure 14 This is a schematic diagram of the structure at point B in this invention.

[0040] In the diagram: 1. Heat exchanger main frame; 2. Inlet slot; 3. Process gas outlet; 4. Outlet port; 5. Mounting plate; 6. Outlet slot; 7. Drive shaft; 8. Top end plate; 9. Heat exchange module; 9a. Modified PTFE sprayed perforated plate; 9b. Mounting lug; 9c. Mounting connecting column; 10. Transfer chamber; 11. Glass heat exchange tube; 11a. Heat exchange and heat transfer chamber; 11b. Heat transfer blades; 11c. Mixing flow connection hole; 12. Centralized chamber; 13. Connecting assembly; 13a. Flow divider cone; 13b. Connecting pipe; 13c. Positioning joint; 13d. Connecting sleeve; 13e. Connector; 14. Collection chamber; 14a. Arc-shaped part; 14b. Limiting inner protrusion; 15. Sealing partition plate; 16. Inlet chamber; 17. PFA tube sleeve. Detailed Implementation

[0041] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0042] Please see Figures 1 to 9 This invention provides a glass tube heat exchanger adapted to sulfur trioxide content. The heat exchanger includes a main frame 1. The bottom of the main frame 1 has an inlet for sulfur trioxide vapor to enter and for sulfuric acid liquid to flow down. Sulfur trioxide vapor enters the main frame 1 through the inlet and undergoes heat exchange. After heat exchange, the sulfuric acid liquid flows down through the inlet. The top of the main frame 1 has a process gas outlet 3. The process gas after heat exchange is discharged from the process gas outlet 3. The main frame 1 has a heat exchange chamber inside. There is a detachable modular heat exchange module 9. The sulfur trioxide vapor passing through the heat exchange module 9 is heat exchanged through the cooling medium flowing inside the heat exchange module 9. That is, the sulfur trioxide vapor medium flows on the outside of the glass heat exchange tube 11, and the cooling medium flows on the inside of the glass heat exchange tube 11. This allows the cooling medium to absorb the heat of the sulfuric acid vapor and achieve the heat exchange effect. When the sulfuric acid liquid flows down to the bottom of the glass heat exchange tube 11, the sulfuric acid liquid that falls on the outer surface of the glass heat exchange tube 11 can be washed away to reduce the risk of impurities depositing and scaling on the heat exchange surface of the glass heat exchange tube 11, further ensuring high heat exchange efficiency.

[0043] The heat exchange module 9 includes a glass heat exchange tube 11. The middle part of the glass heat exchange tube 11 is suspended and in contact with sulfur trioxide vapor. Through multiple sets of heat exchange modules 9 and the glass heat exchange tubes 11 thereon, the flow direction of sulfur trioxide vapor can be guided, avoiding direct and concentrated passage through the heat exchange cavity. It has a relatively guiding effect on sulfur trioxide vapor, so that sulfur trioxide vapor fills the heat exchange cavity relatively evenly, ensuring that the glass heat exchange tube 11 can exchange heat relatively fully and improving the heat exchange effect.

[0044] The glass heat exchange tube 11 is hollow in the middle along the axial direction, and the diameter of the end of the glass heat exchange tube 11 gradually decreases, which can form a slope or arc surface, increasing the contact area between the end of the glass heat exchange tube 11 and the outside. The glass heat exchange tube 11 includes heat transfer blades 11b in the hollow part and heat transfer chambers 11a in the outer ring. The heat transfer blades 11b can increase the contact area between the cooling medium and the glass heat exchange tube 11, thereby improving the heat exchange efficiency of the cooling medium.

[0045] The heat transfer blades 11b extend along the axial direction, and each blade 11b has a through-hole 11c. The through-hole 11c allows the internal space of the glass heat exchange tube 11 to be interconnected, preventing the cooling media flowing within the tube from becoming isolated. This avoids the concentration of heat caused by sulfur trioxide vapor contacting the bottom of the tube when it passes through, allowing heat transfer between the cooling media within the tube. The heat transfer chamber 11a is hollow and vacuum-sealed. The end of the chamber 11a is spiral-shaped, conforming to the end of the glass heat exchange tube 11. The chamber 11a is filled with a vaporized cooling medium. A liquid-absorbing core is located inside the chamber 11a to guide the cooling medium towards the center of the glass heat exchange tube 11. By evacuating the chamber, the temperature of the heat transfer chamber can be lowered. The boiling point of the internal cooling medium in 11a makes it easier to vaporize. It comes into contact with sulfur trioxide vapor in the middle section of the glass heat exchange tube 11, causing the cooling medium in the middle section of the heat exchange chamber 11a to vaporize and carry away its heat. Then, under the action of gas pressure, the vapor moves to the end of the glass heat exchange tube 11 and condenses at the end of the glass heat exchange tube 11, forming a liquid again. Under the capillary adsorption of the liquid wick, the liquid formed at the end will flow back to the middle section, thus repeating the heat exchange cycle. Because the latent heat of vaporization is extremely large, a small temperature difference can transfer a large amount of heat, thereby improving the heat exchange effect. Furthermore, because the cooling medium flowing inside the glass heat exchange tube 11 flows in one direction, the heat exchange effect is reduced in subsequent flows due to the increased heat accumulated in the cooling medium. At this time, the cooling medium can transfer the heat accumulated in the cooling medium, reducing the heat of the cooling medium in subsequent flows, thereby improving the heat exchange effect.

[0046] The heat exchanger main frame 1 is provided with a first conveying line for conveying cooling medium into the glass heat exchange tube 11 and a second conveying line for cooling the end of the glass heat exchange tube 11. The first conveying line can convey the cooling medium into the glass heat exchange tube 11 for heat exchange, and the second conveying line can cool the end of the glass heat exchange tube 11, thereby forming a condensation area at the end of the heat exchange chamber 11a.

[0047] Please see Figures 1 to 9 and Figures 11 to 13The heat exchange module 9 also includes modified PTFE sprayed perforated plates 9a on both sides. The modified PTFE sprayed perforated plates 9a are provided with inwardly penetrating mounting ears 9b. The mounting ears 9b are fitted with PFA tube sleeves 17 and welded on both sides. The double-sided welding achieves an interference fit, thereby ensuring sealing performance and preventing sulfuric acid vapor leakage. The glass heat exchange tube 11 is inserted into the PFA tube sleeve 17, and the end of the glass heat exchange tube 11 extends out of the modified PTFE sprayed perforated plates 9a. That is, the modified PTFE sprayed perforated plates 9a isolate the end of the glass heat exchange tube 11 from the heat exchange chamber, thereby preventing the temperature of the heat exchange chamber from affecting the condensation at the end of the glass heat exchange tube 11.

[0048] The end of the modified PTFE sprayed perforated plate 9a contacts the inner wall of the heat exchanger main frame 1, forming an inner annular channel for heat exchange of sulfur trioxide vapor. The inner ring formed by the contact between the heat exchanger main frame 1 and the modified PTFE sprayed perforated plate 9a is lined with PFA. PFA perfluoroalkoxy resin has excellent chemical stability, corrosion resistance and non-stick properties, which can effectively prevent sulfuric acid vapor from corroding the wall plate and ensure long-term stable operation of the equipment.

[0049] Please see Figures 1 to 9 and Figures 11 to 13 The upper part of the heat exchanger main frame 1 is provided with two sets of heat exchange chambers, and the lower part of the heat exchanger main frame 1 is provided with an inverted triangular collection chamber 14, which can collect and gather sulfuric acid liquid, making the collection of sulfuric acid more convenient. The bottom of the heat exchange chamber is connected to the top of the collection chamber 14, and the bottom of the collection chamber 14 is connected to the outlet.

[0050] The collection chamber 14 is equipped with a sealing partition plate 15 that can individually close the heat exchange chamber. The sealing partition plate 15 is located in the middle of the opening, and all its heat exchange chambers are in an open state. That is, the sealing partition plate 15 can close one heat exchange chamber, meaning that only one heat exchange chamber can be in an open state at this time. At this time, the corresponding process gas outlet 3 and the mounting plate 5 can be disassembled to replace the corresponding heat exchange module 9, which can quickly realize maintenance. Heat exchange can still be carried out during maintenance, ensuring normal and continuous heat exchange. During normal operation, both heat exchange chambers can be opened, thereby achieving a high-efficiency heat exchange effect.

[0051] Please see Figures 1 to 13The collection chamber 14 is rotatably connected to a drive shaft 7, and the sealing partition plate 15 is installed on the drive shaft 7. The lower part of the collection chamber 14 is provided with an arc-shaped part 14a that matches the rotation trajectory of the outer ring of the sealing partition plate 15. The upper end of the collection chamber 14 is provided with a limiting inner protrusion 14b that limits the rotation of the sealing partition plate 15. When the sealing partition plate 15 rotates, the end of the sealing partition plate 15 can contact the arc-shaped part 14a. When the sealing partition plate 15 rotates to abut against the limiting inner protrusion 14b, the sealing partition plate 15 can close a single heat exchange chamber.

[0052] Please see Figures 1 to 13 The heat exchanger main frame 1 includes a top end plate 8 bolted to the top and a mounting plate 5 bolted to the front of the upper part of the heat exchanger main frame 1. Both the mounting plate 5 and the top end plate 8 are provided with PFA lining at the contact points with sulfur trioxide vapor. The heat exchange module 9 can be replaced and maintained by disassembling the mounting plate 5 and the top end plate 8.

[0053] Please see Figures 1 to 13 The second conveying line includes an air inlet chamber 16 located at the bottom of the heat exchanger main frame 1, which supplies air from bottom to top. The air inlet chamber 16 is located outside the collection chamber 14, and an output port 4 located at the top of the heat exchanger main frame 1.

[0054] A U-shaped cooling chamber is formed between the outer side of the heat exchange module 9 and the inner wall of the heat exchanger main frame 1. The air inlet chamber 16 is connected to the bottom of one end of the cooling chamber, and the output port 4 is connected to the top of the other end of the cooling chamber. Air can then be supplied from the air inlet chamber 16 to the cooling chamber, thereby cooling the end of the glass heat exchange tube 11 to form a condensation area.

[0055] Please see Figures 1 to 13 The first conveying line includes a transfer conveying chamber 10 located on the left and right sides of the heat exchanger main frame 1, a central chamber 12 located between the two sets of heat exchange chambers, and a connecting assembly 13 for connecting the glass heat exchange tube 11 to the transfer conveying chamber 10 and the central chamber 12 respectively. An input slot 2 is provided through the upper part of the outer side of the transfer conveying chamber 10, and an output slot 6 is provided through the lower part of the rear side of the central chamber 12. The cooling medium is conveyed from the input slot 2 into the transfer conveying chamber 10, then into the glass heat exchange tube 11, and finally flows into the central chamber 12 and is output from the output slot 6.

[0056] Please see Figures 1 to 14 The connecting assembly 13 includes a diversion cone 13a, a connecting pipe 13b, a positioning connector 13c, a connecting sleeve 13d, and a connector 13e.

[0057] The positioning joint 13c is installed on the inner wall of the heat exchanger main frame 1 and is connected to the transfer chamber 10 and the central chamber 12 respectively. The two ends of the connecting sleeve 13d are threadedly connected to the positioning joint 13c and the connecting head 13e respectively. Through the connection of the connecting sleeve 13d, the heat exchange module 9 can be smoothly connected to the positioning joint 13c, and the glass heat exchange tube 11 can be connected to the transfer chamber 10. The connecting head 13e is installed on the outer side of the diversion cone 13a, and the connecting pipe 13b is installed on the inner side of the diversion cone 13a. The cooling medium in the transfer chamber 10 is transported to the positioning joint 13c and then transported to the diversion cone 13a through the connecting sleeve 13d and the connecting head 13e.

[0058] Please see Figures 1 to 14 The end of the connecting pipe 13b is inserted into the end of the glass heat exchange tube 11. A mounting connecting post 9c is installed on the outside of the mounting ear hole 9b. The flow divider cone 13a is installed on the end of the mounting connecting post 9c by bolts, so that the connecting assembly 13 can be disassembled smoothly, which facilitates the maintenance of the glass heat exchange tube 11. A rubber sealing gasket is provided at the insertion point. The connecting pipe 13b and the connector 13e are both connected to the inside of the flow divider cone 13a.

[0059] Both ends of the connecting sleeve 13d are provided with inwardly recessed threaded mounting ring holes, and the ends of the connecting pipe 13b and the connector 13e extend into the threaded mounting ring holes and are threadedly connected to the connecting sleeve 13d.

[0060] In summary, this glass tube heat exchanger adapted to sulfur trioxide operates as follows: during use, cooling medium is transported from the input port 2 into the transfer chamber 10. The cooling medium is then transported through the positioning joint 13c and the connecting head 13e into the flow divider cone 13a, and then through the connecting pipe 13b into the glass heat exchange tube 11. It then flows into the collection chamber 12 from the connecting assembly 13 at the other end of the glass heat exchange tube 11 and flows out from the output port 6. The sulfur trioxide vapor enters the collection chamber 14 from the outlet and is guided into the heat exchange chamber. Finally, it is discharged from the process gas outlet 3 as heat exchange gas, and the condensed sulfuric acid liquid flows out from the outlet.

[0061] When sulfur trioxide vapor passes through the glass heat exchange tube 11, it transfers heat to the cooling medium inside the glass heat exchange tube 11 and carries away the heat. When heat is transferred on the glass heat exchange tube 11, the cooling medium inside the heat exchange chamber 11a evaporates. The vaporized cooling medium condenses at the end of the glass heat exchange tube 11. Under the capillary adsorption of the wick and the guidance of gravity, the cooling medium can flow back to the middle section of the heat exchange chamber 11a in liquid form. The heat transfer blades 11b can increase the contact area of ​​the cooling medium inside the glass heat exchange tube 11 and improve the heat exchange efficiency of the cooling medium.

[0062] By supplying air into the air inlet chamber 16 and to the end of the glass heat exchange tube 11, the end of the glass heat exchange tube 11 is cooled by air to reduce the temperature of the end of the glass heat exchange tube 11, ensuring that the cooling medium in the heat exchange chamber 11a can be condensed smoothly.

[0063] By rotating the output slot 6, the sealing partition plate 15 can rotate under the drive of the rotation of the output slot 6. When the sealing partition plate 15 abuts against the limited inner protrusion 14b, one heat exchange chamber can be closed. That is, only one heat exchange chamber can be in the open state at this time. At this time, the corresponding process gas outlet 3 and the mounting plate 5 can be disassembled to replace the corresponding heat exchange module 9, so as to quickly realize maintenance. Heat exchange can still be carried out during maintenance, ensuring normal and continuous heat exchange.

[0064] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A glass tube heat exchanger adapted to contain sulfur trioxide, characterized by: The heat exchanger comprises a heat exchanger main frame (1), the bottom of the heat exchanger main frame (1) is provided with a through opening for sulfur trioxide vapor entering and sulfuric acid liquid flowing out, the top of the heat exchanger main frame (1) is provided with a process gas outlet (3), the inside of the heat exchanger main frame (1) is provided with a heat exchange cavity, the inside of the heat exchange cavity is provided with a detachable and modular heat exchange module (9), and the sulfur trioxide vapor passing through the heat exchange module (9) is subjected to heat exchange through a cooling medium flowing in the heat exchange module (9); The heat exchange module (9) comprises a glass heat exchange pipe (11), the middle part of the glass heat exchange pipe (11) is in a suspended state and is in contact with the sulfur trioxide vapor; The middle part of the glass heat exchange pipe (11) is hollow along the axial direction, the end part of the glass heat exchange pipe (11) gradually decreases in size, and the glass heat exchange pipe (11) comprises heat transfer blades (11b) at the hollow part and a heat exchange cavity (11a) at the outer ring part; The heat transfer blades (11b) extend along the axial direction, the heat transfer blades (11b) are provided with a mixed flow connecting hole (11c) penetrating through the heat transfer blades (11b), the heat exchange cavity (11a) is hollow and is in a vacuum state, the end part of the heat exchange cavity (11a) is in a spiral line shape matched with the end part of the glass heat exchange pipe (11), the heat exchange cavity (11a) is filled with a cooling working medium for vaporization heat transfer, and a wick for guiding the cooling working medium to the middle part of the glass heat exchange pipe (11) is arranged at the inside of the heat exchange cavity (11a); The heat exchanger main frame (1) is provided with a first conveying line for conveying the cooling medium in the glass heat exchange pipe (11) and a second conveying line for cooling the end part of the glass heat exchange pipe (11); The heat exchange module (9) further comprises modified PTFE spray hole plates (9a) at both sides, the modified PTFE spray hole plates (9a) are provided with mounting ear holes (9b) penetrating inwards, the mounting ear holes (9b) are sleeved with PFA pipe sleeves (17) and are double-sided welded, the glass heat exchange pipe (11) penetrates in the PFA pipe sleeve (17), and the end part of the glass heat exchange pipe (11) extends out of the modified PTFE spray hole plate (9a); The end part of the modified PTFE spray hole plate (9a) is in contact with the inner wall of the heat exchanger main frame (1), forming an inner annular channel for heat exchange of the sulfur trioxide vapor, and the heat exchanger main frame (1) and the modified PTFE spray hole plate (9a) form an inner ring provided with a PFA lining.

2. A glass tube heat exchanger suitable for containing sulfur trioxide according to claim 1, characterized in that: The upper part of the heat exchanger main frame (1) is provided with two groups of heat exchange cavities, the lower part of the heat exchanger main frame (1) is provided with an inverted triangular collecting cavity (14), the bottom of the heat exchange cavity is in communication with the top of the collecting cavity (14), and the bottom of the collecting cavity (14) is in communication with the through opening; The collecting cavity (14) is provided with a sealing partition plate (15) capable of separately sealing the heat exchange cavities, the sealing partition plate (15) is located in the middle of the through opening, and the heat exchange cavities are in an open state.

3. A glass tube heat exchanger adapted to contain sulfur trioxide according to claim 2, characterized in that: The transmission rotating shaft (7) is rotatably connected in the collecting cavity (14), the sealing partition plate (15) is installed on the transmission rotating shaft (7), the inside of the lower part of the collecting cavity (14) is provided with a circular arc part (14a) matched with the outer rotating track of the sealing partition plate (15), and the collecting cavity (14) is provided with a limited inner convex part (14b) limiting the rotation of the sealing partition plate (15) at the upward end of the collecting cavity (14).

4. A glass tube heat exchanger suitable for containing sulfur trioxide according to claim 3, characterized in that: The heat exchanger main frame (1) comprises a top end plate (8) installed on the top by bolts and a mounting plate (5) installed on the front of the upper part of the heat exchanger main frame (1) by bolts, and the mounting plate (5) and the top end plate (8) are provided with PFA lining at the positions where they are contacted with sulfur trioxide vapor.

5. A glass tube heat exchanger suitable for containing sulfur trioxide according to claim 3, characterized in that: The second conveying line comprises an air inlet cavity (16) arranged on the lower part of the heat exchanger main frame (1) and sending air from bottom to top, the air inlet cavity (16) is located outside the collecting cavity (14), and the output port (4) is located at the top of the heat exchanger main frame (1). The outer side of the heat exchange module (9) and the inner wall of the heat exchanger main frame (1) form a U-shaped cooling cavity, the air inlet cavity (16) is connected with the bottom of one end of the cooling cavity, and the output port (4) is connected with the top of the other end of the cooling cavity.

6. A glass tube heat exchanger suitable for containing sulfur trioxide according to claim 3, wherein: The first conveying line comprises rotating conveying cavities (10) located on the left and right sides of the heat exchanger main frame (1), a concentrating cavity (12) located between the two groups of heat exchange cavities, and connecting assemblies (13) for connecting the glass heat exchange pipes (11) with the rotating conveying cavities (10) and the concentrating cavity (12) respectively, the upper part of the outer side of the rotating conveying cavity (10) is provided with an input slot (2), and the lower part of the rear side of the concentrating cavity (12) is provided with an output slot (6).

7. A glass tube heat exchanger suitable for containing sulfur trioxide according to claim 6, characterized in that: The connecting assembly (13) comprises a shunt cone (13a), a connecting pipe (13b), a positioning connector (13c), a connecting sleeve (13d), and a connecting head (13e). The positioning connector (13c) is installed on the inner wall of the heat exchanger main frame (1) and is connected with the rotating conveying cavity (10) and the concentrating cavity (12) respectively, the two ends of the connecting sleeve (13d) are threadedly connected with the positioning connector (13c) and the connecting head (13e) respectively, the connecting head (13e) is installed on the outer side of the shunt cone (13a), and the connecting pipe (13b) is installed on the inner side of the shunt cone (13a).

8. A glass tube heat exchanger adapted to contain sulfur trioxide according to claim 7, characterized in that: The end of the connecting pipe (13b) is inserted into the end of the glass heat exchange pipe (11), the outer side of the mounting ear hole (9b) is provided with a mounting connecting column (9c), the shunt cone (13a) is bolted on the end of the mounting connecting column (9c), and a rubber sealing gasket is arranged at the insertion position, and the connecting pipe (13b) and the connecting head (13e) are connected with the inside of the shunt cone (13a) respectively. The two ends of the connecting sleeve (13d) are provided with inwardly recessed threaded mounting ring holes, and the ends of the connecting pipe (13b) and the connecting head (13e) are inserted into the threaded mounting ring holes and are threadedly connected with the connecting sleeve (13d).

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