Glass lining tube type heat exchanger

Abstract

The utility model discloses a glass lining tube type heat exchanger, and belongs to the field of corrosion-resistant heat exchange equipment. The heat exchanger comprises a cylindrical shell, an upper end cover and a lower end cover, wherein the upper end cover and the lower end cover are hermetically mounted at two ends of the cylindrical shell; a plurality of heat exchange tubes with glass-lined inner walls are arranged in the cylinder body in a parallel array manner through a sealing structure consisting of an end face fixing flange, a glass-lined tube plate and a fixed tube plate; the sealing structure is fixed with a barrel flange through a bolt, a teflon sealing kit made of teflon is inserted into a plate hole of the glass lining tube plate, and the end part of the heat exchange tube penetrates through the fixed tube plate and then is tightly butted with the kit; and the inner walls of the upper and lower end covers and the outer wall of the glass-lined tube plate are glass-lined layers. According to the utility model, the comprehensive protection of corrosive materials is realized, the leakproofness, the heat exchange efficiency and the maintenance convenience of the equipment are obviously improved through the multi-stage sealing and quick-opening locking mechanism, and the problems that the traditional metal heat exchanger is easy to corrode and leak are solved.

Description

TECHNICAL FIELD

[0001] The utility model relates to corrosion -resistant tube -in -tube heat exchanger technical field, specifically is a glass lining tube -in -tube heat exchanger. BACKGROUND

[0002] Tube -in -tube heat exchanger as the common heat exchange equipment in chemical industry, pharmaceutical industry and other industrial fields, its performance and reliability directly affect production safety and efficiency. In the heat exchange process involving strong acid, strong base, organic solvent and other corrosive media, the traditional tube -in -tube heat exchanger usually has the following significant deficiencies:

[0003] 1. Insufficient corrosion resistance: the heat exchange tube, tube plate and shell of conventional heat exchanger adopt metal materials (such as stainless steel, carbon steel), although certain corrosion prevention treatment is carried out, but when contacting harsh medium for a long time, uniform corrosion, pitting or stress corrosion cracking still easily occur, leading to equipment perforation, medium leakage, not only shortening equipment life, but also bringing serious safety and environmental risk. Although some equipment adopts lining corrosion -resistant material, but at the complex connection between tube plate and heat exchange tube, it is often difficult to achieve complete and reliable coverage, becoming a weak link of corrosion.

[0004] 2. Poor sealing reliability: the core sealing difficulty of tube -in -tube heat exchanger lies in the connection sealing between a large number of heat exchange tubes and tube plate. The traditional process adopts expansion joint, welding or combination of the two. However, under the working conditions of temperature cycle, pressure fluctuation and equipment vibration, fatigue, creep of metal and difference of thermal expansion coefficient between dissimilar materials, microcracks or gaps are easily generated at these connection parts, leading to cross leakage (internal leakage) between tube side and shell side medium. This leakage is difficult to detect, but can cause product contamination, medium loss and energy efficiency decline.

[0005] 3. Difficult maintenance: once tube bundle leakage occurs, the traditional welding or expansion joint structure makes it extremely difficult to replace a single heat exchange tube, often needing cutting, re -welding or expansion pipe, complex process, high requirement for construction technology, and may cause damage to surrounding intact heat exchange tube and tube plate, leading to high maintenance cost and long downtime.

[0006] In order to solve the above problems, although some technologies try to adopt all -plastic or plastic -lined structure, but there are limitations in pressure bearing capacity, temperature resistance and structural strength. Therefore, there is an urgent need for a new structure of tube -in -tube heat exchanger which can run stably for a long time under high pressure, high temperature and strong corrosion environment, and is absolutely reliable in sealing and easy to maintain. UTILITY MODEL CONTENT

[0007] The utility model aims at: in order to solve the problems in the above background, provide a glass lining tube -in -tube heat exchanger.

[0008] To achieve the above object, the utility model provides the following technical scheme: provide a kind of glass lining tube type heat exchanger, including heat exchanger main body, the heat exchanger main body includes cylindrical shell, upper end cover and lower end cover are sealingly installed in the both ends of cylindrical shell, material inlet is opened in upper end cover, material outlet is opened in lower end cover;Recycle medium inlet is opened in the one end side wall of cylindrical shell, recycle medium outlet is opened in the other end side wall of cylindrical shell;Several heat exchange pipes are arranged in parallel array in the inside of cylindrical shell by sealing mounting structure, the inner wall of heat exchange pipe is glass lining material;The sealing mounting structure includes end face fixed flange, glass lining tube plate and fixed tube plate, cylindrical edge flange is respectively arranged in the both ends of cylindrical shell, end face fixed flange is fixed by bolt installation on cylindrical edge flange, glass lining tube plate is arranged on the side of end face fixed flange, glass lining plate hole is opened on glass lining tube plate, four fluorine sealing sleeve is inserted and arranged on glass lining plate hole;Fixed tube plate is arranged on the side of glass lining tube plate, tube body fixed hole is opened on fixed tube plate, heat exchange pipe is inserted and arranged in tube body fixed hole, the end portion of heat exchange pipe is tightly butt-jointed with four fluorine sealing sleeve after passing through fixed tube plate;The outer wall of glass lining tube plate and the inner wall of upper end cover and lower end cover are all set as glass lining material.

[0009] Preferably, the four fluorine sealing sleeve is a spiral body with a through hole, one end of the four fluorine sealing sleeve is matched with the shape of the end portion of the heat exchange pipe, and the other end of the four fluorine sealing sleeve is matched with the shape of the glass lining plate hole.

[0010] Preferably, O-shaped sealing rings are arranged on the contact surfaces of the four fluorine sealing sleeve and the heat exchange pipe and the contact surfaces of the four fluorine sealing sleeve and the glass lining plate hole.

[0011] Preferably, the glass lining tube plate and the fixed tube plate are connected by bolts.

[0012] Preferably, tube plate sealing rings are arranged between the cylindrical shell, the end face fixed flange and the glass lining tube plate, and the tube plate sealing rings can seal the gap between the cylindrical shell, the end face fixed flange and the glass lining tube plate.

[0013] Preferably, end cover flanges are arranged on the upper end cover and the lower end cover, respectively, the end face fixed flange is in the shape of a ring, and end cover sealing rings are arranged between the end face fixed flange and the end cover flanges.

[0014] Preferably, the upper end cover and the cylindrical shell, and the lower end cover and the cylindrical shell are connected by locking buckles, respectively.

[0015] Preferably, the locking buckle is a bolt double-hook C-shaped buckle; fixing rings are respectively welded on the flanges of the cylinder edge and the end cover; the two ends of the bolt double-hook C-shaped buckle are respectively hooked to the fixing rings on the flanges of the cylinder edge and the end cover to realize the fixed connection between the upper end cover and the cylindrical shell and between the lower end cover and the cylindrical shell.

[0016] Preferably, more than two baffles are arranged on the inner side wall of the cylindrical shell.

[0017] Preferably, the four-fluorine sealing kit is made of polytetrafluoroethylene.

[0018] Compared with the prior art, the utility model has the beneficial effects that:

[0019] 1. Overall corrosion resistance protection is realized. The core innovation of the utility model is that all the key surfaces in contact with corrosive materials, including the inner wall of the heat exchange pipe, the inner wall of the upper and lower end covers and the outer wall of the glass lining tube plate, are all made of glass lining material, and meanwhile, a four-fluorine sealing kit made of polytetrafluoroethylene (PTFE) material is arranged at the key dynamic sealing interface. Both the glass lining and the PTFE have excellent chemical inertness and can resist most strong corrosive media, so that the corrosion of the materials on the equipment main body is fundamentally eliminated, the service life of the equipment is greatly prolonged, and the production safety is ensured.

[0020] 2. A multi-stage and reliable elastic sealing system is constructed.

[0021] The first-stage sealing (pipe end sealing) is realized through the four-fluorine sealing kit made of PTFE material, so that the flexible connection and sealing of the heat exchange pipe end and the hole of the glass lining tube plate are realized. The self-lubricating property and deformation capacity of the PTFE can effectively compensate the slight displacement caused by installation centering and thermal expansion and cold contraction.

[0022] The second-stage sealing (shell sealing) is realized through the tube plate sealing ring arranged between the cylindrical shell, the end face fixing flange and the glass lining tube plate, and the tight pressing of the bolt, so that a firm static sealing is formed, and the circulating medium in the shell is reliably isolated.

[0023] The third-stage sealing (end cover sealing) is realized through the end cover sealing ring and the unique locking buckle (bolt double-hook C-shaped buckle) quick opening structure, so that the quick, uniform and reliable sealing between the end cover and the tube plate is realized, and the equipment maintenance and tube bundle cleaning are facilitated.

[0024] Enhanced sealing: in the preferred embodiment, an O-shaped sealing ring is additionally arranged at the contact surface between the four-fluorine sealing kit and the heat exchange pipe and the tube plate hole, so that the face sealing is upgraded to elastic line sealing, and the anti-micro-leakage capacity is significantly improved, which is especially suitable for the working conditions with extreme sealing requirements.

[0025] 3. The structure design is reasonable, and the heat exchange efficiency and maintainability are improved.

[0026] By incorporating baffles in the shell side, the circulating medium is guided to laterally scour the heat exchanger tube bundle, creating turbulence and disrupting the tube wall boundary layer. This significantly improves the shell-side heat transfer coefficient, while also extending the medium flow path and enhancing overall heat exchange efficiency. The use of a split-type glass-lined tube sheet and a fixed tube sheet, connected by bolts, allows for easy assembly, inspection, and replacement of individual heat exchanger tubes. If a heat exchanger tube is damaged, it can be replaced relatively easily, avoiding the drawback of traditional monolithic tube sheet structures where "one tube failure renders the entire tube unusable," thus significantly reducing maintenance costs.

[0027] 4. Balancing high strength and convenience. The main pressure-bearing components (such as the cylinder and flanges) are made of metal, ensuring the overall mechanical strength of the equipment under high pressure and high temperature. The end cover connection uses a quick-locking buckle, which greatly simplifies the opening and closing operation compared to the traditional multi-bolt flange connection, saving maintenance time and manpower.

[0028] In summary, this invention effectively solves the three major problems of traditional shell-and-tube heat exchangers under highly corrosive conditions: easy corrosion, easy leakage, and difficult maintenance. It provides a new type of glass-lined shell-and-tube heat exchanger that is reliable in sealing, highly corrosion resistant, has high heat transfer efficiency, and is easy to maintain, and has high industrial application value. Attached Figure Description

[0029] Figure 1 This is a schematic diagram of the structure of this utility model;

[0030] Figure 2 This utility model Figure 1 Enlarged view of part A;

[0031] Figure 3 This utility model Figure 1 Enlarged view of part B;

[0032] Figure 4 This is a schematic diagram of the PTFE sealing joint in Embodiment 1 of this utility model;

[0033] Figure 5 This is a schematic diagram of the PTFE sealing joint in Embodiment 2 of this utility model.

[0034] In the diagram: 1. Material inlet; 2. Upper end cover; 3. Locking buckle; 4. Cylindrical outer shell; 5. Heat exchange tube; 6. Baffle plate; 7. Circulating medium inlet; 8. Lower end cover; 9. Material outlet; 10. Glass-lined tube sheet; 11. Fixed tube sheet; 12. PTFE sealing kit; 13. Circulating medium outlet; 14. Glass-lined plate hole; 15. Fixing ring; 16. Cylinder edge flange; 17. End cover sealing ring; 18. End face fixing flange; 19. Tube sheet sealing ring; 20. Tube body fixing hole; 21. O-ring seal. Detailed Implementation

[0035] The technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of the utility model. Embodiment 1

[0036] Please refer to Figures 1 to 4 In the embodiments of the utility model, a glass-lined tube type heat exchanger comprises a heat exchanger main body, the heat exchanger main body comprises a cylindrical shell 4, an upper end cover 2 and a lower end cover 8 are sealingly installed at both ends of the cylindrical shell 4, a material inlet 1 is formed in the upper end cover 2, and a material outlet 9 is formed in the lower end cover 8; a circulating medium inlet 7 is formed in the sidewall of one end of the cylindrical shell 4, and a circulating medium outlet 13 is formed in the sidewall of the other end of the cylindrical shell 4; a plurality of heat exchange tubes 5 are arranged in parallel array in the interior of the cylindrical shell 4 through a sealing installation structure, and the inner wall of the heat exchange tube 5 is made of glass lining material; the sealing installation structure comprises an end face fixed flange 18, a glass-lined tube sheet 10 and a fixed tube sheet 11, a cylinder edge flange 16 is arranged at each end of the cylindrical shell 4, the end face fixed flange 18 is fixedly installed on the cylinder edge flange 16 through bolts, the glass-lined tube sheet 10 is arranged on one side of the end face fixed flange 18, glass-lined plate holes 14 are formed in the glass-lined tube sheet 10, and a four-fluorine sealing sleeve 12 is insertedly arranged in the glass-lined plate hole 14; the fixed tube sheet 11 is arranged on one side of the glass-lined tube sheet 10, tube body fixing holes 20 are formed in the fixed tube sheet 11, and the heat exchange tubes 5 are insertedly arranged in the tube body fixing holes 20, the end part of the heat exchange tube 5 is tightly butt-jointed with the four-fluorine sealing sleeve 12 after penetrating through the fixed tube sheet 11; the outer wall of the glass-lined tube sheet 10 and the inner walls of the upper end cover 2 and the lower end cover 8 are all made of glass lining material. The four-fluorine sealing sleeve 12 is made of polytetrafluoroethylene material.

[0037] The four-fluorine sealing sleeve 12 is in the shape of a convolute with a through hole, one end of the four-fluorine sealing sleeve 12 is matched with the shape of the end part of the heat exchange tube 5, and the other end of the four-fluorine sealing sleeve 12 is matched with the shape of the glass-lined plate hole 14.

[0038] The glass-lined tube sheet 10 and the fixed tube sheet 11 are connected through bolts.

[0039] A tube sheet sealing ring 19 is arranged between the cylindrical shell 4, the end face fixed flange 18 and the glass-lined tube sheet 10, and the tube sheet sealing ring 19 can seal the gap between the cylindrical shell 4, the end face fixed flange 18 and the glass-lined tube sheet 10.

[0040] End flanges are arranged on the upper end cover 2 and the lower end cover 8 respectively, the end face fixing flange 18 is annular, and the end face fixing flange 18 is arranged between the end face fixing flange 18 and the end flange.

[0041] The upper end cover 2 and the cylindrical shell 4 are connected through the locking buckle 3, and the lower end cover 8 and the cylindrical shell 4 are connected through the locking buckle 3.

[0042] The locking buckle 3 is a bolt double-hook C-shaped buckle; fixing rings 15 are welded on the cylindrical edge flange 16 and the end flange respectively, and the two ends of the bolt double-hook C-shaped buckle are respectively hooked to fix the fixing rings 15 on the cylindrical edge flange 16 and the end flange, so as to realize the fixed connection between the upper end cover 2 and the cylindrical shell 4 and the fixed connection between the lower end cover 8 and the cylindrical shell 4.

[0043] Two or more than two baffles 6 are arranged on the inner side wall of the cylindrical shell 4.

[0044] The embodiment is suitable for working conditions with high requirements for sealing pressure and temperature. The core feature is to provide stable and rigid fixation by bolt connection, and to realize multiple sealing by relying on the end cover sealing ring 17 and the tube plate sealing ring 19.

[0045] The specific use method is as follows:

[0046] I. Assembly and connection:

[0047] 1. The glass-lined tube plate 10 with the glass-lined plate hole 14 and the fixed tube plate 11 are tightly connected by bolts to form a whole tube plate assembly.

[0048] 2. The heat exchange pipe 5 is inserted into the pipe body fixing hole 20 on the fixed tube plate 11 in sequence.

[0049] 3. The tetrafluoro sealing kit 12 (polytetrafluoroethylene material) is inserted into the glass-lined plate hole 14 of the glass-lined tube plate 10, and then the end part of the heat exchange pipe 5 inserted into the fixed tube plate 11 is pushed into the tetrafluoro sealing kit 12 to tightly butt joint, forming the first corrosion-resistant sealing between the heat exchange pipe 5 and the tube plate.

[0050] 4. The assembled tube plate assembly (containing the array of heat exchange pipes 5) is placed into the cylindrical shell 4, so that the outer side of the glass-lined tube plate 10 is aligned with the cylindrical edge flange 16.

[0051] 5. The tube plate sealing ring 19 is placed in sequence, then the end face fixing flange 18 is covered thereon, and finally the high-strength bolt is used to fasten the end face fixing flange 18 on the cylindrical edge flange 16. Through the strong pre-tightening force of the bolt, the tube plate sealing ring 19 is pressed tightly, so as to seal the gap between the cylindrical shell 4, the end face fixing flange 18 and the glass-lined tube plate 10, and form the second sealing on the shell side.

[0052] II. End cover installation and sealing:

[0053] 1. Place end cover sealing rings 17 between the end cover flanges of the upper end cover 2 and the end face fixing flanges 18.

[0054] 2. Using the locking buckle 3 (in this embodiment, it is a bolt double hook C-shaped buckle), hook the hooks at both ends onto the fixing rings 15 welded to the cylinder flange 16 and the end cover flange respectively, and then tighten the bolts on the buckle to quickly and securely lock the end cover and press the end cover sealing ring 17 to form the third seal of the material channel.

[0055] III. Operating Procedures:

[0056] 1. Material Flow: Corrosive materials enter through the material inlet 1 of the upper end cover 2 and flow through all the heat exchange tubes 5, whose inner walls are made of glass-lined material. During the flow, the material is blocked by multiple baffles 6 on the inner wall of the cylindrical outer shell 4, forming a tortuous flow channel, thereby prolonging the residence time and heat exchange path of the material in the heat exchanger and improving the heat exchange efficiency. The heat-exchanged material is discharged from the material outlet 9 of the lower end cover 8. Throughout the entire material flow, the material only comes into contact with the glass-lined or polytetrafluoroethylene (PTFE) surface, achieving comprehensive corrosion protection.

[0057] 2. Circulating medium side process: Cooling or heating medium (such as cooling water or steam) enters the shell-side space between the cylindrical shell 4 and the heat exchange tube 5 from the circulating medium inlet 7, scours the outer wall of the heat exchange tube 5 laterally, exchanges heat with the material inside the tube, and is discharged from the circulating medium outlet 13.

[0058] 3. Advantages of this embodiment: Bolted connections provide extremely high structural strength and sealing pressure, making them suitable for applications with high operating pressure. The multi-ring design (tube sheet sealing ring 19, end cap sealing ring 17) ensures reliable sealing between different interfaces, preventing leakage between materials and the circulating medium. Example 2

[0059] like Figure 5 As shown, in this embodiment, O-rings 21 are provided on the contact surface between the PTFE sealing kit 12 and the heat exchange tube 5, as well as on the contact surface between the PTFE sealing kit 12 and the glass plate hole 14.

[0060] This embodiment makes a key improvement on Embodiment 1 by adding an O-ring 21 to the contact surface between the PTFE sealing kit 12 and the heat exchange tube 5 and the glass-lined plate hole 14. This solution is particularly suitable for operating conditions with extremely strict sealing requirements, highly corrosive media, or the possibility of slight vibration. The specific usage method is as follows:

[0061] I. Special installation of the sealing kit:

[0062] 1. The core step of this embodiment is to insert O-rings 21 (usually made of fluororubber or perfluoroether rubber to maintain corrosion resistance) into the grooves on the end of the heat exchange tube 5 and the groove matching the hole 14 of the glass-lined plate before installing the PTFE sealing kit 12.

[0063] 2. The subsequent assembly steps (tube sheet assembly, cylinder installation, flange bolt tightening, end cover buckle locking, etc.) are the same as in Example 1.

[0064] II. Sealing principle and advantages:

[0065] 1. The addition of O-rings 21 upgrades the original rigid surface contact sealing to elastic line contact sealing. When the heat exchange tube 5 is inserted and tightly pressed into the PTFE sealing kit 12, the O-rings are squeezed to produce elastic deformation, tightly filling the microscopic machining gaps or unevenness.

[0066] 2. This design can effectively compensate for the gap changes caused by machining tolerances, thermal expansion and contraction, or slight vibrations, significantly improving the ability to prevent micro-leakage.

[0067] 3. Even if the PTFE sealing kit 12 made of PTFE material experiences slight creep or stress relaxation after long-term use, the elasticity of the O-rings 21 can still provide continuous sealing force, extending the maintenance cycle of the sealing components.

[0068] III. Operation process:

[0069] The process of materials and circulating media is exactly the same as in Example 1. The enhanced sealing performance ensures that the two media can still be absolutely isolated and safely operated under more severe process conditions.

[0070] The advantages of this embodiment: While inheriting all the corrosion resistance and high-efficiency heat exchange advantages of Example 1, the "PTFE + O-ring" composite sealing design achieves ultra-high sealing reliability and stronger adaptability to harsh conditions, especially suitable for handling high-risk, high-value or zero-tolerance to environmental leakage corrosive materials.

[0071] The remaining structure and implementation are the same as in Example 1 and will not be repeated. The above describes only the preferred specific implementation of the present application, but the protection scope of the present application is not limited to this. Any skilled person in the technical field according to the technical solution and the inventive concept of the present application can make equivalent substitutions or changes within the technical range disclosed by the present application, which should be covered within the protection scope of the present application.

Claims

1. A glass-lined tube heat exchanger, comprising a heat exchanger body, characterized in that, The heat exchanger body includes a cylindrical shell (4), with an upper end cover (2) and a lower end cover (8) sealed at both ends of the cylindrical shell (4). A material inlet (1) is provided on the upper end cover (2), and a material outlet (9) is provided on the lower end cover (8). A circulating medium inlet (7) is provided on one side wall of the cylindrical shell (4), and a circulating medium outlet (13) is provided on the other side wall of the cylindrical shell (4). Several heat exchange tubes (5) are arranged in parallel array inside the cylindrical shell (4) through a sealed installation structure. The inner wall of the heat exchange tubes (5) is made of glass enamel. The sealed installation structure includes an end face fixing flange (18), a glass enamel tube sheet (10), and a fixing tube sheet (11). A cylindrical edge flange (16) is provided at both ends of the cylindrical shell (4). The end face fixed flange (18) is fixed to the cylinder side flange (16) by bolts. A glass-lined tube plate (10) is provided on one side of the end face fixed flange (18). A glass-lined plate hole (14) is opened on the glass-lined tube plate (10). A PTFE sealing kit (12) is inserted into the glass-lined plate hole (14). A fixed tube plate (11) is provided on one side of the glass-lined tube plate (10). A tube body fixing hole (20) is opened on the fixed tube plate (11). A heat exchange tube (5) is inserted into the tube body fixing hole (20). The end of the heat exchange tube (5) passes through the fixed tube plate (11) and is tightly connected to the PTFE sealing kit (12). The outer wall of the glass-lined tube plate (10) and the inner walls of the upper end cover (2) and the lower end cover (8) are all made of glass-lined material.

2. The glass-lined tube heat exchanger according to claim 1, characterized in that, The PTFE sealing kit (12) is a gyro-shaped body with a through hole. One end of the PTFE sealing kit (12) fits and matches the end shape of the heat exchange tube (5), and the other end of the PTFE sealing kit (12) fits and matches the shape of the hole (14) in the glass plate.

3. A glass-lined tube heat exchanger according to claim 2, characterized in that, O-rings (21) are provided on the contact surfaces of the PTFE sealing kit (12) and the heat exchange tube (5), as well as on the contact surfaces of the PTFE sealing kit (12) and the glass plate hole (14).

4. A glass-lined tube heat exchanger according to claim 1, characterized in that, The glass-lined tube sheet (10) and the fixed tube sheet (11) are connected by bolts.

5. A glass-lined tube heat exchanger according to claim 1, characterized in that, A tube sheet sealing ring (19) is provided between the cylindrical shell (4), the end face fixing flange (18) and the glass-lined tube sheet (10), and the tube sheet sealing ring (19) can seal the gap between the cylindrical shell (4), the end face fixing flange (18) and the glass-lined tube sheet (10).

6. A glass-lined tube heat exchanger according to claim 1, characterized in that, End cover flanges are respectively provided on the upper end cover (2) and the lower end cover (8). The end face fixing flange (18) is annular, and an end cover sealing ring (17) is provided between the end face fixing flange (18) and the end cover flange.

7. A glass-lined tube heat exchanger according to claim 1, characterized in that, The upper end cover (2) and the cylindrical outer shell (4), as well as the lower end cover (8) and the cylindrical outer shell (4), are connected by locking buckles (3).

8. A glass-lined tube heat exchanger according to claim 7, characterized in that, The locking buckle (3) is a bolt double hook C-shaped clip; fixing rings (15) are welded on the cylindrical flange (16) and the end cover flange respectively. The two ends of the bolt double hook C-shaped clip are hooked and fixed on the fixing rings (15) on the cylindrical flange (16) and the end cover flange respectively, so as to realize the fixed connection between the upper end cover (2) and the cylindrical shell (4) and the lower end cover (8) and the cylindrical shell (4).

9. A glass-lined tube heat exchanger according to claim 1, characterized in that, Two or more baffles (6) are provided on the inner wall of the cylindrical shell (4).

10. A glass-lined tube heat exchanger according to claim 1, characterized in that, The PTFE sealing kit (12) is made of polytetrafluoroethylene.

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