Internal slag returning mechanism of anhydrous hydrogen fluoride reacting furnace
Through the coaxial arrangement of the slag return cylinder and fixedly connected to the inner wall of the reactor, combined with the welding of the fixed clamp and leg and the fastening insert design, the insufficient structural strength and inconvenient maintenance of the slag return mechanism in the anhydrous hydrogen fluoride reactor are solved, and efficient and stable slag return process and material utilization are achieved.
Patent Information
- Application Number
- CN202422704976.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-06
- Publication Date
- 2025-08-22
- Estimated Expiration
- 2034-11-06
AI Technical Summary
The welding connection method of the slag return mechanism in the existing anhydrous hydrogen fluoride reactor results in insufficient structural strength, inconvenient operation and maintenance, and difficulty in long-term stable operation.
The slag return cylinder is coaxially arranged and fixedly connected to the inner wall of the reactor. The fixing clamps and legs are welded, combined with the interference matching design of the fastening insert, ensure the stability and flexibility of the slag return cylinder and the inner wall of the reactor.
It improves the efficiency of slag rebate, enhances structural stability, reduces maintenance difficulty, reduces energy consumption, and improves material utilization and equipment life.
Smart Images
Figure CN223249289U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the field of machinery, in particular to an internal slag returning mechanism of an anhydrous hydrogen fluoride reactor. Background Art
[0002] Fluorspar and sulfuric acid react in the hydrogen fluoride reactor to produce hydrogen fluoride gas and fluorgypsum slag. This reaction consumes a large amount of heat energy. Most of the fluorgypsum slag is discharged through the slag discharge screw at the reactor's tail. A small amount of fluorgypsum slag is returned to the furnace head through the reactor's internal slag return system. The high-temperature heat it carries is used to preheat the raw materials, improving reaction efficiency and material utilization.
[0003] In the prior art, the connection between the slag return tube of the internal slag return mechanism and the reactor is achieved by leg welding, which has the following problems in practical application:
[0004] Insufficient structural strength: Although the welding method can ensure the fixing effect in the short term, the overall structure of the slag return tube is heavy and the stress borne by the leg welding is large, which can easily lead to cracks or damage in the welding points due to long-term stress, resulting in structural instability and affecting the operation of the equipment.
[0005] Inconvenient operation and maintenance: Once assembled, this type of welding connection is difficult to disassemble and maintain flexibly. When the slag return barrel needs to be repaired, replaced, or adjusted, the operation is complicated, time-consuming, and labor-intensive, increasing production costs and the difficulty of equipment maintenance. Summary of the Invention
[0006] In order to solve the above technical problems, the utility model provides an internal slag returning mechanism for an anhydrous hydrogen fluoride reactor.
[0007] The utility model is realized through the following technical solutions:
[0008] The utility model discloses an internal slag return mechanism of an anhydrous hydrogen fluoride reactor, comprising a slag return barrel and a slag return spiral blade, the slag return barrel is a hollow cylindrical barrel with openings at both ends; the slag return barrel is coaxially arranged inside the reactor; the slag return spiral blade is arranged on the inner wall of the slag return barrel, and its spiral conveying direction is opposite to the feeding direction of the reactor; a slag return scoop is provided on one end of the slag return barrel near the tail of the reactor; the slag return barrel is fixedly connected to the inner wall of the reactor through a plurality of connecting parts, and the plurality of connecting parts are arranged in a linear equidistant array along the central axis of the slag return barrel; the connecting part comprises a fixing clamp and a support leg; the fixing clamp is a circular ring, which is coaxially fixedly connected to the slag return barrel by an interference fit and is arranged on the outer wall of the slag return barrel; a plurality of support legs are provided on the outer side of the fixing clamp, and the plurality of support legs are arranged in a circumferential array along the central axis of the fixing clamp; the two ends of the support leg are fixedly connected to the fixing clamp and the reactor respectively.
[0009] The design of the slag return barrel ensures the stability of the slag return mechanism inside the reactor through a coaxial arrangement, which helps to improve the efficiency of the slag return process. The reverse setting of the slag return spiral blade can effectively realize the reverse movement of the material, thereby ensuring the directional transportation of the material. The slag return scoop is set at the tail of the reactor. This structural arrangement allows the slag accumulated at the tail to be quickly dug out and returned to the reaction area, allowing the material to continue to react and improve the utilization rate of the material. At the same time, the slag return barrel is fixedly connected to the inner wall of the reactor through a number of connectors, so that the entire slag return mechanism has good mechanical strength, ensuring the stability of the structure under long-term working conditions. The equidistant array arrangement of the connectors can disperse the force and prevent the deformation of the barrel due to uneven force.
[0010] Furthermore, the above-mentioned slag return spiral blades are all over the inner wall of the slag return barrel; the above-mentioned slag return spiral blades are incomplete blades, and a cylindrical space is left in the center part for the material to pass through. The spiral blades are all over the inner wall of the slag return barrel, and this design can ensure efficient transportation during slag return. The incomplete design of the blades, that is, retaining a cylindrical space in the center part, is to reduce transportation resistance and ensure that the material can flow smoothly inside the slag return barrel. Such a design can not only increase the stability of the slag return, but also avoid the complete closure of the blades, which may cause material accumulation or jamming. The existence of the cylindrical space can also effectively reduce the power consumption of the system and improve energy efficiency.
[0011] Furthermore, there are a number of the above-mentioned slag return scoops, which are arranged in a circular array along the central axis of the slag return tube; the above-mentioned slag return scoops are bucket-shaped and connected to the internal cavity of the slag return tube; the feeding plane where the above-mentioned slag return scoops contact the material coincides with the central axis of the slag return tube.
[0012] The number of return slag scoops is set to several, which can more efficiently dig and transport the return slag, avoiding the situation where a single scoop cannot cope with large-scale return slag. Their circular array arrangement makes the return slag process more uniform and smooth. The bucket-shaped design is conducive to the digging and transportation of materials, especially in high-temperature and high-load operating environments. The bucket-shaped structure can provide sufficient strength and durability. In addition, the feed plane of the return slag scoop coincides with the central axis of the return slag barrel, ensuring that the return slag scoop can accurately grasp the material during operation, reducing efficiency losses caused by offset during the return slag process.
[0013] Furthermore, the connection between the legs, the fixing clamps, and the reactor is welded. This welded connection between the legs, the fixing clamps, and the reactor ensures the strength and stability of the overall structure. This welded connection not only withstands thermal stresses at high temperatures but also prevents the slag return barrel from loosening or shifting due to external forces such as vibration and friction during prolonged use. This welding method also ensures a tight connection between the slag return barrel and the inner wall of the reactor, extending the service life of the slag return system.
[0014] Furthermore, the inner wall diameter of the above-mentioned fixing clamp is larger than the outer wall diameter of the slag return barrel; a fastening insert is inserted between the above-mentioned fixing clamp and the slag return barrel to fill the gap between the two and achieve interference fit.
[0015] The inner diameter of the retaining clamp is designed to be larger than the outer diameter of the slag return barrel. This structural design reserves space for the fastening insert, ensuring flexible adjustment during installation. The fastening insert creates an interference fit between the slag return barrel and the retaining clamp, preventing the slag return barrel from shaking or slipping during use. The insert not only provides a fixed position but also absorbs vibration and stress to a certain extent, protecting the slag return barrel and reactor from damage.
[0016] Furthermore, the aforementioned fastening inserts are provided in a plurality and arranged in a circular array along the central axis of the fixed clamp. This circumferential arrangement of the fastening inserts ensures a uniform and tight connection between the fixed clamp and the slag return barrel, avoiding stress concentration and structural deformation caused by single-point force. The presence of multiple inserts also ensures that the entire slag return barrel remains balanced during operation, preventing deviation or tilt. This evenly distributed insert structure design greatly improves the durability and operational reliability of the entire slag return mechanism.
[0017] Furthermore, the securing insert has a fan-shaped cross-section, with its lower curved surface conforming to the outer wall of the slag return barrel. This fan-shaped cross-section allows the insert to better conform to the outer wall of the slag return barrel, increasing the contact area and thus improving the securing effect of the insert. The conforming design of the lower curved surface distributes stress more evenly, preventing wear or fracture caused by localized excessive stress. This structure also provides greater stability, ensuring that the slag return barrel can maintain stable operation even in harsh operating environments.
[0018] Furthermore, the upper arc surface of the above-mentioned fastening insert changes in thickness from one end to the other end, so that the fastening insert is wedge-shaped as a whole. And among a number of fastening inserts, the insertion directions of two adjacent fastening inserts are set in opposite directions. The upper arc surface of the fastening insert is designed to be wedge-shaped, so that the insert can achieve a tighter fit by wedging during the installation process. The structure with gradually thinning thickness not only facilitates the installation and adjustment of the insert, but the staggered inserted fastening inserts can also provide a stronger clamping force during the interference fit process. The wedge-shaped design can effectively prevent the insert from loosening during long-term use, ensuring that the connection between the slag return barrel and the clamp always remains tight.
[0019] Furthermore, the upper curved surface of the aforementioned fastening insert is provided with a number of strip-shaped or dot-shaped protrusions. These protrusions further enhance the friction between the insert and the fixing clamp, thereby improving the insert's stability and securing effectiveness. These protrusions effectively prevent the insert from slipping during an interference fit, while also helping to distribute stress on the insert, extending its service life. The protrusions also provide additional support in tiny gaps, enhancing the reliability of the overall device.
[0020] The beneficial effects of the present invention are:
[0021] High slag return efficiency: Through the reverse setting of the slag return spiral blades, the reverse transportation of materials inside the slag return tube is realized, and the slag at the tail of the reactor can be quickly returned to the reaction area, thereby improving the utilization efficiency of materials and effectively reducing resource waste.
[0022] Strong structural stability: The slag return cylinder is fixedly connected to the inner wall of the reactor via a number of legs arranged in an equidistant array, distributing the load and preventing deformation or damage to the cylinder due to localized uneven loads. This structural design enhances the overall mechanical strength of the slag return mechanism, ensuring stable operation under high temperatures and high loads for extended periods.
[0023] Easy maintenance: The design of the fixing clamp and fastening insert ensures a tight fit between the slag return tube and the inner wall of the reactor. The wedge-shaped design of the fastening insert and the strip or dot-shaped protrusions increase friction, making installation and removal easier. At the same time, it avoids the maintenance difficulties caused by traditional welding methods, making the equipment more flexible and convenient when repairs or replacements are needed.
[0024] Reduce energy consumption: The slag return spiral blade is designed as an incomplete blade with a cylindrical space in its center, which reduces the material conveying resistance, makes the material flow smoother, effectively reduces the power consumption of the system and improves energy efficiency.
[0025] Improve the uniformity of slag return: The slag return scoop is arranged in a multi-point circular array, which can evenly scoop out the accumulated slag at the tail and return it to the reaction area, avoiding the problem of uneven treatment by a single scoop, thereby improving the stability and efficiency of the slag return process. BRIEF DESCRIPTION OF THE DRAWINGS
[0026] Figure 1 : Schematic diagram of the three-dimensional structure of the utility model;
[0027] Figure 2 : Another three-dimensional structural schematic diagram of the utility model;
[0028] Figure 3 : The main view of the utility model;
[0029] Figure 4: End view of the utility model;
[0030] Figure 5 : Schematic diagram of the arrangement of the fastening inserts of the utility model;
[0031] Figure 6 : Schematic diagram of the three-dimensional structure of the fastening insert of the utility model;
[0032] Figure 7 : A sectional view of the three-dimensional structure of the utility model;
[0033] Figure 8 : Installation diagram of the utility model;
[0034] In the figure: 1-slag return cylinder, 2-slag return spiral blade, 3-slag return scoop, 4-connecting piece, 41-fixing clamp, 42-support leg, 5-fastening insert, A-furnace body. DETAILED DESCRIPTION
[0035] The present invention will be further described below with reference to the accompanying drawings and specific embodiments:
[0036] Example: Figure 1-8 As shown, an internal slag return mechanism of an anhydrous hydrogen fluoride reactor comprises a slag return barrel 1 and a slag return spiral blade 2. The slag return barrel 1 is a hollow cylindrical barrel with openings at both ends; the slag return barrel 1 is coaxially arranged inside the reactor; the slag return spiral blade 2 is arranged on the inner wall of the slag return barrel 1, and its spiral conveying direction is opposite to the feeding direction of the reactor; a slag return scoop 3 is provided on one end of the slag return barrel 1 near the tail of the reactor; the slag return barrel 1 is fixedly connected to the inner wall of the reactor through a number of connectors 4. Then, several of the above-mentioned connecting parts 4 are arranged in a straight and equidistant array along the central axis of the slag return tube 1; the above-mentioned connecting parts 4 include a fixing clamp 41 and a support leg 42; the above-mentioned fixing clamp 41 is a circular ring, which is coaxially fixedly connected to the slag return tube 41 through interference fit and is arranged on the outer wall of the slag return tube 1; a number of support legs 42 are provided on the outside of the above-mentioned fixing clamp 41, and the several above-mentioned support legs 42 are arranged in a circular array along the central axis of the fixing clamp 41; the two ends of the above-mentioned support legs 42 are respectively fixedly connected to the fixing clamp 41 and the reactor.
[0037] The design of the slag return barrel 1 ensures the stability of the slag return mechanism inside the reactor through a coaxial arrangement, which helps to improve the efficiency of the slag return process. The reverse setting of the slag return spiral blade 2 can effectively realize the reverse movement of the material, thereby ensuring the directional transportation of the material. The slag return scoop 3 is set at the tail of the reactor. This structural arrangement enables the slag accumulated at the tail to be quickly dug out and returned to the reaction area, allowing the material to continue to react and improve the utilization rate of the material. At the same time, the slag return barrel 1 is fixedly connected to the inner wall of the reactor through a number of connectors 4, so that the entire slag return mechanism has good mechanical strength, ensuring the stability of the structure under long-term working conditions. The equidistant array arrangement of the connectors 4 can disperse the force and prevent the cylinder from deformation due to uneven force.
[0038] The above-mentioned slag return spiral blades 2 are all over the inner wall of the slag return tube 1; the above-mentioned slag return spiral blades 2 are incomplete blades, and a cylindrical space is left in the center part for the material to pass through. The spiral blades 2 are all over the inner wall of the slag return tube 1. This design can ensure efficient transportation during slag return. The incomplete design of the blades, that is, retaining a cylindrical space in the center part, is to reduce transportation resistance and ensure that the material can flow smoothly inside the slag return tube 1. Such a design can not only increase the stability of the slag return, but also avoid the complete closure of the blades, which may cause material accumulation or jamming. The existence of the cylindrical space can also effectively reduce the power consumption of the system and improve energy efficiency.
[0039] There are several slag return scoops 3, which are arranged in a circular array along the central axis of the slag return tube 1; the slag return scoops 3 are bucket-shaped and connected to the internal cavity of the slag return tube 1; the feeding plane where the slag return scoops 3 contact the material coincides with the central axis of the slag return tube 1.
[0040] The number of slag return scoops 3 is set to several, which can more efficiently dig and transport the slag return, and avoid the situation where a single scoop cannot cope with large-scale slag return. Their circular array arrangement makes the slag return process more uniform and smooth. The bucket-shaped design is conducive to the digging and transportation of materials, especially in high-temperature and high-load operating environments, the bucket-shaped structure can provide sufficient strength and durability. In addition, the feed plane of the slag return scoop 3 coincides with the central axis of the slag return barrel, ensuring that the slag return scoop 3 can accurately grab the material during work, reducing the efficiency loss caused by offset during the slag return process.
[0041] The connection between the legs 42, the fixing clamp 41, and the reactor is welded. This welded connection between the legs 42, the fixing clamp 41, and the reactor ensures the strength and stability of the overall structure. The welded connection not only withstands thermal stress at high temperatures but also prevents the slag return barrel 1 from loosening or shifting due to external forces such as vibration and friction during prolonged use. This welding method also ensures a tight connection between the slag return barrel 1 and the inner wall of the reactor, extending the service life of the slag return system.
[0042] The inner wall diameter of the fixing clamp 41 is larger than the outer wall diameter of the slag return tube 1 ; a fastening insert 5 is inserted between the fixing clamp 41 and the slag return tube 1 to fill the gap therebetween and achieve interference fit.
[0043] The inner diameter of the fixing clamp 41 is designed to be larger than the outer diameter of the slag return tube 1. This structural design reserves space for the fastening insert 5, ensuring flexible adjustment during installation. The fastening insert 5 creates an interference fit between the slag return tube 1 and the fixing clamp 41, preventing the slag return tube 1 from shaking or slipping during use. The insert not only provides a fixed position but also absorbs vibration and stress to a certain extent, protecting the slag return tube 1 and the reactor from damage.
[0044] Several fastening inserts 5 are provided, arranged in a circular array along the central axis of the fixing clamp 41. This circular arrangement ensures a uniform and tight connection between the fixing clamp 41 and the slag return barrel 1, preventing stress concentration and structural deformation caused by single-point force. The presence of multiple inserts also ensures that the entire slag return barrel 1 remains balanced during operation, preventing deviation or tilt. This evenly distributed insert structure significantly improves the durability and operational reliability of the entire slag return mechanism.
[0045] The securing insert 5 has a fan-shaped cross-section, with its lower curved surface conforming to the outer wall of the slag return tube 1. This fan-shaped cross-section allows the insert 5 to better conform to the outer wall of the slag return tube 1, increasing the contact area and thus improving the securing effect of the insert. The conforming design of the lower curved surface distributes stress more evenly, preventing wear or fracture caused by excessive localized stress. This structure also provides greater stability, ensuring that the slag return tube 1 can maintain stable operation even in harsh operating environments.
[0046] The upper curved surface of the fastening insert 5 changes in thickness from one end to the other, so that the fastening insert 5 is wedge-shaped as a whole. And among the fastening inserts 5, the insertion directions of two adjacent fastening inserts 5 are set in opposite directions. The upper curved surface of the fastening insert 5 is designed to be wedge-shaped, so that the insert can achieve a tighter fit by wedging during the installation process. The structure with gradually thinning thickness not only facilitates the installation and adjustment of the insert, but the staggered insertion of the fastening inserts 5 can also provide a stronger clamping force during the interference fit process. The wedge-shaped design can effectively prevent the insert from loosening during long-term use, ensuring that the connection between the slag return barrel and the clamp always remains tight.
[0047] The upper curved surface of the aforementioned fastening insert 5 is provided with a number of strip-shaped or dot-shaped protrusions. These protrusions further enhance the friction between the insert and the fixing clamp 41, thereby improving the insert's stability and securing effectiveness. These protrusions effectively prevent the insert from slipping during an interference fit and also help distribute stress on the insert, extending its service life. The protrusions also provide additional support in tiny gaps, enhancing the reliability of the overall device.
[0048] In a typical hydrogen fluoride production process, fluorite and sulfuric acid react at high temperature in a reactor to generate hydrogen fluoride gas and a certain amount of by-product - fluorgypsum slag. These fluorgypsum slags contain a small amount of unreacted fluorite sulfuric acid and carry a large amount of heat energy. The internal slag return reactor can make full use of the thermal energy of the fluorgypsum slag, improve reaction efficiency and reduce material waste. As the reaction process continues, the slag generated will gradually deposit in the tail area of the reactor. The internal slag return mechanism starts and operates synchronously with the reactor, returning the slag to the furnace head in time, and preheating the raw materials entering the reactor in time. The slag return tube 1 is coaxially arranged inside the reactor, and its design enables the slag return mechanism to work stably and in coordination with the reactor as a whole.
[0049] The slag return spiral blades 2 are evenly distributed along the inner wall of the slag return barrel 1, and their spiral conveying direction is opposite to the feed direction of the reactor. When the reactor is operating, the spiral blades 2 inside the slag return barrel 1 begin to rotate in the opposite direction of the slag return mechanism, conveying the slag accumulated at the rear of the reactor toward the reactor head. The incomplete design of the spiral blades leaves a cylindrical space, which ensures a relatively smooth flow of material during the slag return process and prevents blockage.
[0050] When slag accumulates in the tail area of the slag return barrel 1, the slag return scoops 3 near the furnace tail come into play. These scoops 3 are bucket-shaped and arranged in a circular array along the central axis of the slag return barrel 1, effectively scooping out the deposited slag. Each scoop 3 communicates with the cavity inside the slag return barrel 1, ensuring that the slag can enter the slag return barrel 1 through the scoop and continue to be transported to the reactor head.
[0051] The slag return tube 1 is secured to the inner wall of the reactor via several connectors 4. These connectors include a fixing clamp 41 and support legs 42. The support legs 42 are securely welded to the inner wall of the reactor, ensuring that the slag return tube 1 does not deflect or loosen under extreme operating conditions such as high temperature and vibration. The equidistant array arrangement of the connectors 4 ensures uniform force distribution on the slag return tube 1, preventing deformation caused by uneven force distribution.
[0052] The slag is transported in reverse by spiral blades within the slag return tube 1, ultimately re-entering the high-temperature zone of the reactor within the reaction area. The recycled slag is then reintegrated into the reaction between aluminum hydroxide and hydrogen fluoride, allowing the material, which was originally waste slag, to be reused. This internal slag return mechanism significantly improves material utilization throughout the anhydrous hydrogen fluoride production process.
[0053] To ensure a tight connection between the slag return barrel and the fixing clamp 41, several fastening inserts 5 are designed to fill the gap between the slag return barrel 1 and the clamp 41. The wedge-shaped design of these inserts ensures that they can be tightened through an interference fit, and the protrusions on the insert surface further enhance friction, preventing the inserts from loosening due to vibration during the slag return process.
[0054] This slag return mechanism not only effectively solves the problem of slag accumulation in the entire anhydrous hydrogen fluoride production process, but also improves the reaction efficiency and equipment life. The slag return process of this mechanism is efficient and stable, making it suitable for large-scale continuous production environments.
[0055] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or make equivalent replacements for some of the technical features therein. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.
Claims
1. An internal slag return mechanism of an anhydrous hydrogen fluoride reactor, comprising a slag return cylinder (1) and a slag return spiral blade (2), characterized in that: The slag return tube (1) is a hollow cylindrical body with two ends open; the slag return tube (1) is coaxially arranged inside the reactor; the slag return spiral blade (2) is arranged on the inner wall of the slag return tube (1), and its spiral conveying direction is opposite to the feeding direction of the reactor; a slag return scoop (3) is provided on one end of the slag return tube (1) close to the tail of the reactor; the slag return tube (1) is fixedly connected to the inner wall of the reactor through a plurality of connecting pieces (4), and the plurality of connecting pieces (4) are arranged along the central axis of the slag return tube (1). The connecting member (4) is arranged in a linear equidistant array; the connecting member (4) includes a fixing clamp (41) and a support leg (42); the fixing clamp (41) is a circular ring, coaxially fixedly connected to the slag return barrel (1) through an interference fit, and is arranged on the outer wall of the slag return barrel (1); a plurality of support legs (42) are arranged on the outer side of the fixing clamp (41), and the plurality of support legs (42) are arranged in a circumferential array along the central axis of the fixing clamp (41); the two ends of the support leg (42) are fixedly connected to the fixing clamp (41) and the reactor, respectively.
2. The internal slag return mechanism of an anhydrous hydrogen fluoride reactor according to claim 1, characterized in that: The slag return spiral blade (2) is fully covered on the inner wall of the slag return cylinder (1); the slag return spiral blade (2) is an incomplete blade, and a cylindrical space is left in its center for material to pass through.
3. The internal slag return mechanism of an anhydrous hydrogen fluoride reactor according to claim 1, characterized in that: A plurality of slag return scoops (3) are provided and arranged in a circular array along the central axis of the slag return barrel (1); the slag return scoops (3) are bucket-shaped and are connected to the internal cavity of the slag return barrel (1); and the feeding plane where the slag return scoops (3) contact the material coincides with the central axis of the slag return barrel (1).
4. The internal slag return mechanism of an anhydrous hydrogen fluoride reactor according to claim 1, characterized in that: The connection between the support leg (42), the fixing clamp (41) and the reactor is a welded fixed connection.
5. The internal slag return mechanism of an anhydrous hydrogen fluoride reactor according to any one of claims 1 to 4, characterized in that: The inner wall diameter of the fixing clamp (41) is larger than the outer wall diameter of the slag return barrel (1); a fastening insert (5) is inserted between the fixing clamp (41) and the slag return barrel (1) to fill the gap between the two and achieve an interference fit.
6. The internal slag return mechanism of the anhydrous hydrogen fluoride reactor according to claim 5, characterized in that: A plurality of fastening inserts (5) are provided and arranged in a circular array along the central axis of the fixing clamp (41).
7. The internal slag return mechanism of an anhydrous hydrogen fluoride reactor according to claim 6, characterized in that: The cross section of the fastening insert (5) is fan-shaped, and its lower arc surface fits the outer wall of the slag return barrel (1).
8. The internal slag return mechanism of an anhydrous hydrogen fluoride reactor according to claim 7, characterized in that: The upper arc surface of the fastening insert (5) changes in thickness from one end to the other end, so that the fastening insert (5) is wedge-shaped as a whole; the insertion directions of two adjacent fastening inserts (5) are arranged in opposite directions.
9. The internal slag return mechanism of an anhydrous hydrogen fluoride reactor according to claim 8, characterized in that: The upper arc surface of the fastening insert (5) is provided with a plurality of strip-shaped or dot-shaped protrusions.