Non-metal tube furnace sealing protective atmosphere system

Abstract

The application discloses a non-metal tube furnace sealing protection atmosphere system and relates to the technical field of tube furnaces. The non-metal tube furnace sealing protection atmosphere system comprises a non-metal furnace tube arranged in a sealing heating chamber, an atmosphere circulation system communicated with the sealing heating chamber, and a leakage protection and detection system arranged in the sealing heating chamber. The leakage protection and detection system is used for detecting whether the non-metal furnace tube has a reaction atmosphere leakage condition and stopping the reaction atmosphere from leaking into the sealing heating chamber when the reaction atmosphere leaks. The non-metal furnace tube is sealed by the sealing heating chamber, so that the atmosphere is prevented from leaking from the non-metal furnace tube into the sealing heating chamber during high-temperature sintering. Meanwhile, the two ends of the non-metal furnace tube are sealed by a sealing transition piece, so that the reaction atmosphere is prevented from leaking out. The sealing transition piece is located outside the sealing heating chamber, so that the influence of the sintering temperature on the sealing effect can be effectively reduced.

Description

Technical Field

[0001] This invention relates to the field of tubular furnace technology, and more specifically, to a sealing and protective atmosphere system for a non-metallic tubular furnace. Background Technology

[0002] The ultra-high temperature tubular furnace for sintering lithium battery materials sintersulates materials at high temperatures during operation. Sometimes, it is necessary to introduce special reaction atmospheres (including dangerous gases such as flammable, explosive, and highly toxic gases), which puts great pressure on the sealing performance.

[0003] The high-temperature sintering reaction of lithium battery materials requires extremely high purity of atmosphere. There must be no active gases such as air and oxygen in the furnace atmosphere. If necessary, an inert protective gas needs to be introduced. The reaction atmosphere and protective atmosphere are introduced into the furnace in a certain ratio. Under high temperature conditions, the reaction atmosphere and the materials undergo a high-temperature sintering reaction.

[0004] The protective atmosphere is an inert gas such as nitrogen or argon. Since the protective atmosphere does not react, it is extracted after being injected into the furnace, which would be wasteful. Therefore, it is necessary to design a circulating atmosphere system to reuse the protective atmosphere in order to reduce production costs.

[0005] In high-temperature tubular furnaces for lithium battery materials, the internal pressure is higher than the external pressure after gas is introduced. Leakage of hazardous gases can have serious consequences, making sealing requirements extremely high. Ordinary sealing structures are difficult to use on non-metallic materials, and the furnace tube temperature is extremely high. High-quality rubber seals cannot withstand the high temperatures, while high-temperature-resistant sealing materials have poor sealing performance. High-temperature non-metallic furnace tubes can be divided into integral and multi-segment spliced ​​types. In high-temperature environments, atmosphere can leak out of non-metallic furnace tubes. Therefore, how to achieve complete sealing of ultra-high-temperature non-metallic furnace tubes is also the technical problem that this invention aims to solve.

[0006] Therefore, it is necessary to propose a non-metallic tubular furnace sealing protective atmosphere system to at least partially solve the problems existing in the prior art. Summary of the Invention

[0007] The summary section introduces a series of simplified concepts, which will be further explained in detail in the detailed description section. The summary section of this invention is not intended to limit the key features and essential technical features of the claimed technical solution, nor is it intended to determine the scope of protection of the claimed technical solution.

[0008] To at least partially solve the above problems, the present invention provides a non-metallic tubular furnace sealed protective atmosphere system, comprising: a non-metallic furnace tube disposed in a sealed heating chamber, both ends of the non-metallic furnace tube penetrating the sealed heating chamber, and both ends of the non-metallic furnace tube being connected to the sealed heating chamber through a sealed transition member, and the outlet of the non-metallic furnace tube being provided with a material collection device for recovering materials.

[0009] An atmosphere circulation system is connected to both ends of the non-metallic furnace tube via a sealed transition piece and simultaneously connected to the sealed heating chamber. The atmosphere circulation system is used to supply a reaction atmosphere and a protective atmosphere to the feed inlet of the non-metallic furnace tube, and to recover or treat the exhaust gas at the discharge outlet, and to supply a protective atmosphere to the sealed heating chamber.

[0010] The sealed heating chamber is equipped with a leakage protection and detection system to detect whether there is a leakage of the reaction atmosphere in the non-metallic furnace tube, and to prevent the reaction atmosphere from leaking into the sealed heating chamber when a leakage occurs.

[0011] Preferably, the non-metallic furnace tube is a single piece or a multi-segment spliced ​​type, and is made of non-metallic high-temperature resistant material.

[0012] Preferably, the atmosphere circulation system comprises a reaction atmosphere supply end that provides the reaction atmosphere, a protective atmosphere supply end that provides the protective atmosphere, a circulation device for gas recycling, and an exhaust gas treatment device for exhaust gas discharge.

[0013] The reaction atmosphere supply end is connected to the feed inlet of the non-metallic furnace tube through a first atmosphere control valve;

[0014] The protective atmosphere supply end is connected to the feed inlet of the non-metallic furnace tube through a first protective atmosphere control valve.

[0015] A first pressure monitor is installed at the feed inlet of the non-metallic furnace tube;

[0016] The circulation device is connected to the discharge port of the non-metallic furnace tube through a first waste gas control valve;

[0017] The exhaust gas treatment device is connected to the discharge port of the non-metallic furnace tube through a second exhaust gas control valve.

[0018] Preferably, the circulation device comprises a cooler connected to the outlet of the non-metallic furnace tube via a first exhaust gas control valve, an atmosphere filter connecting the cooler to an atmosphere recovery tank, and an atmosphere recovery tank connected to the inlet of the non-metallic furnace tube via a second atmosphere control valve.

[0019] Preferably, the protective atmosphere supply end is connected to the inner top of the sealed heating chamber through a second protective atmosphere control valve. A second pressure detector is also provided at the inner top of the sealed heating chamber. A first exhaust valve and a second exhaust valve are provided at the bottom of the sealed heating chamber. The second protective atmosphere control valve, the second pressure detector, the first exhaust valve, and the second exhaust valve constitute the leakage protection and detection system. The gas pressure inside the sealed heating chamber is not less than the gas pressure inside the non-metallic furnace tube.

[0020] Preferably, the sealing transition member consists of transition members disposed at both ends of the non-metallic furnace tube, and a first sealing member sleeved on the outer wall of the non-metallic furnace tube for sealing the transition members with the non-metallic furnace tube.

[0021] Preferably, the first sealing element consists of two separate sealing rings, both of which are disposed on the outer wall of the non-metallic furnace tube. The outer wall of each separate sealing ring is provided with a high-temperature resistant elastic sealing layer. The two separate sealing rings are detachably connected. The two separate sealing rings are respectively a thick ring closer to the sealed heating chamber and a thin ring farther away from the sealed heating chamber. The axial length of the thick ring is greater than that of the thin ring, and the fastening joints of the thick ring and the thin ring are staggered.

[0022] Preferably, the split sealing ring consists of two symmetrically structured semi-rings, which are detachably connected by screws. The outer wall of each semi-ring is provided with a high-temperature resistant elastic sealing layer, and the inner wall is selectively provided with a high-temperature resistant elastic sealing layer. One end face of each semi-ring has a first threaded hole, a first limiting hole, and a positioning through hole extending axially to the other end face. The first threaded hole, the first limiting hole, and the positioning through hole form a group, and at least three groups are provided on the end face of the semi-ring. The other end face has a second threaded hole and a second limiting hole. The half-ring has a hole and a detachable positioning pin, and the positioning through hole extends from the other side. The second threaded hole, the second limiting hole, the positioning pin and the positioning through hole form a group. At least three groups are provided on this end face of the half-ring. The positioning pin is selectively inserted into the first limiting hole or the second limiting hole. Between two axially adjacent half-rings, a screw passes through the positioning through hole of one half-ring and is threaded to the first threaded hole or the second threaded hole of the other half-ring. The two end faces of the half-ring are also provided with end face sealing rings made of high-temperature resistant elastic sealing material.

[0023] Preferably, the sealing transition member further includes a second sealing member, which is located in the sealed heating chamber and is tubularly fitted onto the outer wall of the non-metallic furnace tube. The end of the second sealing member is provided with a connecting ring and an insertable sealing ring. The second sealing member is selectively connected to the inner wall of the sealed heating chamber through the connecting ring, and the insertable sealing ring is located between the outer wall of the non-metallic furnace tube and the side wall of the sealed heating chamber.

[0024] Preferably, the second sealing element is a hollow structure consisting of an outer tube wall that can deform when heated, an inner tube wall that adheres to the outer wall of the non-metallic furnace tube, a deformable end that fixes the insert-type sealing ring, and a connecting ring. One end of the outer tube wall is connected to the connecting ring, and the other end is connected to one end of the inner tube wall. The other end of the inner tube wall is connected to one end of the deformable end, and the other end of the deformable end is connected to the connecting ring. A gap is reserved between the deformable end and the outer tube wall. An insertion end that adheres to the outer wall of the non-metallic furnace tube is provided on the deformable end. The connection between the insertion end and the deformable end is located at the connection between the deformable end and the inner tube wall. The insert-type sealing ring is provided on the insertion end, and there is an angle between the insertion end and the deformable end.

[0025] Compared with the prior art, the present invention has at least the following beneficial effects:

[0026] This invention seals the non-metallic furnace tube within a sealed heating chamber to prevent atmosphere leakage from the tube into the chamber during high-temperature sintering. Simultaneously, a sealing transition piece seals both ends of the non-metallic furnace tube to prevent further leakage of the reaction atmosphere. Located outside the sealed heating chamber, the sealing transition piece effectively reduces the impact of temperature on the sealing effect during sintering.

[0027] During operation, a protective atmosphere and a reaction atmosphere are first injected into the non-metallic furnace tube through an atmosphere circulation system. At the same time, the atmosphere circulation system also supplies a protective atmosphere to the sealed heating chamber, and makes the gas pressure in the sealed heating chamber higher than the gas pressure in the non-metallic furnace tube. In conjunction with a leakage protection and monitoring system, the pressure in the sealed heating chamber is regulated. Thus, during high-temperature sintering, the reaction atmosphere in the non-metallic furnace tube will not leak into the sealed heating chamber, thereby achieving a sealing effect.

[0028] The reacted materials are sent to a receiving device for recycling. At the same time, the reacted gas is detected by an atmosphere circulation system. If the components in the waste gas are recyclable, the waste gas is recycled, thereby realizing the recycling of the reaction atmosphere and protective atmosphere to reduce production costs. If the components in the waste gas are not worth recycling, the waste gas is treated before being discharged.

[0029] The above structural design can be applied to non-metallic furnace tubes made of non-metallic high-temperature resistant materials, whether in one piece or in multiple sections.

[0030] The non-metallic tubular furnace sealing protective atmosphere system of the present invention, other advantages, objectives and features of the present invention will be apparent in part from the following description, and in part will be understood by those skilled in the art through study and practice of the invention. Attached Figure Description

[0031] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used in conjunction with embodiments of the invention to explain the invention and do not constitute a limitation thereof. In the drawings:

[0032] Figure 1 This is a schematic diagram of the non-metallic tubular furnace sealing and protective atmosphere system described in this invention.

[0033] Figure 2 for Figure 1 A magnified view of the feed inlet of the non-metallic furnace tube.

[0034] Figure 3 The exploded view of the first seal is shown (the thin ring shows the structure of one end face of the half ring, and the thick ring shows the structure of the other end face).

[0035] Figure 4 This is a schematic diagram of the split sealing buckle after it is fastened (thin buckle not shown).

[0036] Figure 5 This is a schematic diagram showing the location of the second sealing element in the non-metallic tubular furnace sealing protective atmosphere system described in this invention.

[0037] Figure 6 for Figure 5 A schematic diagram of the structure of the second seal.

[0038] Figure 7 for Figure 6 A schematic diagram of the internal structure of the second seal.

[0039] Figure 8 for Figure 5 A schematic diagram of the installation of the second seal.

[0040] In the diagram: 1 Sealed heating chamber, 11 Second pressure detector, 12 First exhaust valve, 13 Second exhaust valve, 2 Non-metallic furnace tube, 21 First pressure monitor, 3 Material receiving device, 4 Reaction atmosphere supply end, 41 First atmosphere control valve, 5 Protective atmosphere supply end, 51 First protective atmosphere control valve, 52 Second protective atmosphere control valve, 6 Circulation device, 61 First waste gas control valve, 62 Cooler, 63 Atmosphere recovery tank, 64 Atmosphere filtration device, 65 Second atmosphere control valve, 7 Tail gas treatment device, 71 Second waste gas control valve, 8 Transition piece, 9 First sealing piece, 91 Half ring, 92 Elastic sealing layer, 93 First threaded hole, 94 First limiting hole, 95 Positioning through hole, 96 Second threaded hole, 97 Second limiting hole, 98 Positioning post, 99 End face sealing ring, 10 Second sealing piece, 101 Outer tube wall, 102 Inner tube wall, 103 Deformation end, 104 Connecting ring, 105 Insertion end, 106 Insertion sealing ring. Detailed Implementation

[0041] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments, so that those skilled in the art can implement it based on the description.

[0042] It should be understood that terms such as “having,” “comprising,” and “including” as used herein do not exclude the presence or addition of one or more other elements or combinations thereof.

[0043] like Figures 1-8 As shown, the present invention provides a non-metallic tubular furnace sealing protective atmosphere system, comprising: a non-metallic furnace tube 2 disposed in a sealed heating chamber 1, both ends of the non-metallic furnace tube 2 penetrating the sealed heating chamber 1, and both ends of the non-metallic furnace tube 2 being connected to the sealed heating chamber 1 through a sealing transition member, and the outlet of the non-metallic furnace tube 2 being provided with a material collection device 3 for recovering materials.

[0044] An atmosphere circulation system is connected to both ends of the non-metallic furnace tube 2 via a sealed transition piece and simultaneously connected to the sealed heating chamber 1. The atmosphere circulation system is used to supply a reaction atmosphere and a protective atmosphere to the feed inlet of the non-metallic furnace tube 2, and to recover or treat the tail gas at the discharge outlet, and to supply a protective atmosphere to the sealed heating chamber 1.

[0045] The sealed heating chamber 1 is equipped with a leakage protection and detection system to detect whether there is a leakage of the reaction atmosphere in the non-metallic furnace tube 2, and to prevent the reaction atmosphere from leaking into the sealed heating chamber 1 when a leakage occurs. The non-metallic furnace tube 2 is either a single piece or a multi-segment spliced ​​type, and is made of non-metallic high-temperature resistant material.

[0046] The working principle and beneficial effects of the above technical solution are as follows: This invention seals the non-metallic furnace tube 2 through a sealed heating chamber 1 to prevent the atmosphere from leaking from the non-metallic furnace tube 2 into the sealed heating chamber 1 during high-temperature sintering. Simultaneously, a sealing transition piece seals both ends of the non-metallic furnace tube 2 to prevent the reaction atmosphere from leaking out. The sealing transition piece is located outside the sealed heating chamber 1, which effectively reduces the impact of temperature on the sealing effect during sintering.

[0047] During operation, a protective atmosphere and a reaction atmosphere are first introduced into the non-metallic furnace tube 2 through an atmosphere circulation system. At the same time, the atmosphere circulation system also supplies a protective atmosphere into the sealed heating chamber 1, making the gas pressure in the sealed heating chamber 1 higher than that in the non-metallic furnace tube 2. In conjunction with a leakage protection and monitoring system, the pressure in the sealed heating chamber 1 is regulated. Thus, during high-temperature sintering, the reaction atmosphere in the non-metallic furnace tube 2 will not leak into the sealed heating chamber 1, thereby achieving a sealing effect.

[0048] The reacted materials are sent to the receiving device 3 for recycling. At the same time, the reacted gas is detected by the atmosphere circulation system. If the components in the waste gas are recyclable, the waste gas is recycled and treated, thereby realizing the recycling of the reaction atmosphere and the protective atmosphere to reduce production costs. If the components in the waste gas are not worth recycling, the waste gas is treated and then discharged.

[0049] The above-mentioned structural design can be applied to non-metallic furnace tubes 2 made of non-metallic high-temperature resistant materials, whether in one piece or in multiple sections.

[0050] In one embodiment, the atmosphere circulation system comprises a reaction atmosphere supply end 4 that provides the reaction atmosphere, a protective atmosphere supply end 5 that provides the protective atmosphere, a circulation device 6 for gas recycling, and an exhaust gas treatment device 7 for exhaust gas discharge.

[0051] The reaction atmosphere supply end 4 is connected to the feed port of the non-metallic furnace tube 2 through the first atmosphere control valve 41.

[0052] The protective atmosphere supply end 5 is connected to the feed port of the non-metallic furnace tube 2 through the first protective atmosphere control valve 51.

[0053] A first pressure monitor 21 is installed at the feed inlet of the non-metallic furnace tube 2;

[0054] The circulation device 6 is connected to the discharge port of the non-metallic furnace tube 2 through the first waste gas control valve 61.

[0055] The exhaust gas treatment device 7 is connected to the discharge port of the non-metallic furnace tube 2 through the second exhaust gas control valve 71.

[0056] The circulation device 6 comprises a cooler 62 connected to the outlet of the non-metallic furnace tube 2 via the first exhaust gas control valve 61, an atmosphere filter 64 connecting the cooler 62 to the atmosphere recovery tank 63, and the atmosphere recovery tank 63 connected to the inlet of the non-metallic furnace tube 2 via the second atmosphere control valve 65.

[0057] The protective atmosphere supply end 5 is connected to the inner top of the sealed heating chamber 1 through the second protective atmosphere control valve 52. The inner top of the sealed heating chamber 1 is also provided with a second pressure detector 11. The bottom of the sealed heating chamber 1 is provided with a first exhaust valve 12 and a second exhaust valve 13. The second protective atmosphere control valve 52, the second pressure detector 11, the first exhaust valve 12 and the second exhaust valve 13 constitute the leakage protection and detection system. The gas pressure in the sealed heating chamber 1 is not less than the gas pressure in the non-metallic furnace tube 2.

[0058] The sealing transition component consists of transition components 8 disposed at both ends of the non-metallic furnace tube 2, and a first sealing component 9 sleeved on the outer wall of the non-metallic furnace tube 2 for sealing the transition components 8 and the non-metallic furnace tube 2.

[0059] The working principle and beneficial effects of the above technical solution:

[0060] The above-mentioned technical solution, through the design of the above structure, addresses the working conditions of ultra-high temperature atmosphere tubular furnaces, improving the atmosphere system and addressing atmosphere leakage issues. This invention comprises a sealed heating chamber 1, a non-metallic furnace tube 2, a material receiving device 3, a transition piece 8, and a first sealing piece 9. The non-metallic furnace tube 2 can be either integral or multi-segmented. The non-metallic furnace tube 2 is horizontally placed in the sealed heating chamber 1. The front and rear ends of the furnace tube are sealed by the transition piece 8 and the first sealing piece 9. The front side of the furnace tube is equipped with a feed inlet, an atmosphere inlet, and a first pressure monitor 21, while the rear side is connected to the material receiving device 3. The atmosphere system consists of a reaction atmosphere supply end 4 and a protective atmosphere supply end 5, connected by a pipeline. The reaction atmosphere supply end 4 and the protective atmosphere supply end 5 are controlled by a first atmosphere control valve 41 and a first protective atmosphere control valve 51, respectively. After mixing, the mixture is injected into the non-metallic furnace tube 2 through the atmosphere inlet. The material fed into the furnace undergoes a high-temperature reaction with the gas. The resulting waste gas and mixed atmosphere (remaining reaction atmosphere and protective atmosphere) are discharged from the tail end. The material is collected by the receiving device 3, while the gas is discharged through the gas pipe. The discharged waste gas is controlled by the first waste gas control valve 61 and the second waste gas control valve 71 to enter the circulation device 6 or the tail gas treatment device 7. The tail gas treatment device 7 treats the waste gas before discharging it. The circulating gas passes through the cooler 62 and the atmosphere filter 64 and then enters the atmosphere recovery tank 63. The second atmosphere control valve 65 controls the gas in the atmosphere recovery tank 63 to be pumped into the furnace to achieve atmosphere recycling. The upper part of the sealed heating chamber 1 is connected to the protective atmosphere supply end 5. The second protective atmosphere control valve 52 controls the protective atmosphere to enter the sealed heating chamber 1. The sealed heating chamber 1 is equipped with a first exhaust valve 12 and a second exhaust valve 13 at the bottom and a second pressure detector 11 at the top.

[0061] During operation, the first exhaust valve 12 and the second exhaust valve 13 are opened, and the second protective atmosphere control valve 52 controls the atmosphere to enter the sealed heating chamber 1. After the air inside the sealed heating chamber 1 is purged, the first exhaust valve 12 and the second exhaust valve 13 are closed, so that the sealed heating chamber 1 is filled with a high-purity protective atmosphere. The non-metallic furnace tube 2 (which can be divided into one-piece and multi-segment spliced ​​types) is made of high-temperature resistant materials such as ceramic, silicon carbide, and corundum. At high temperatures, the gaps between material molecules will increase, and there may be gaps at the splicing points of the multi-segment spliced ​​type. Some gas will leak through the gaps through the furnace tube. The protective atmosphere is injected between the sealed heating chamber 1 and the non-metallic furnace tube 2. The pressure of the injected protective atmosphere is controlled by the second pressure detector 11 to be slightly higher than the pressure of the reaction atmosphere inside the furnace tube, so that the reaction atmosphere cannot leak out of the non-metallic furnace tube 2. The first sealing element 9 at both ends of the non-metallic furnace tube 2 can prevent the protective atmosphere in the sealed heating chamber 1 from directly leaking into the furnace tube and affecting the reaction, and can also seal the atmosphere inside the furnace tube.

[0062] In the above embodiment, the first sealing element 9 can be sealed using a sealing ring. Although the sealing ring can achieve a seal, it is easily damaged by high-temperature erosion during long-term use. In addition, if a sealing ring is used as the first sealing element 9, it needs to be stretched to at least the same size as the outer diameter of the non-metallic furnace tube 2 during installation. For large equipment, the manpower and material resources required for installation are also relatively large. Therefore, to facilitate the installation, replacement and maintenance of the first sealing element 9, this embodiment provides another implementation method. The first sealing element 9 is composed of two split sealing rings. Both split sealing rings are set on the outer wall of the non-metallic furnace tube 2. The outer wall of the split sealing ring is provided with a high-temperature resistant elastic sealing layer 92. The two split sealing rings are detachably connected. The two split sealing rings are a thick ring closer to the sealed heating chamber 1 and a thin ring farther away from the sealed heating chamber 1. The axial length of the thick ring is greater than the axial length of the thin ring. The fastening joints of the thick ring and the thin ring are staggered.

[0063] The split sealing ring consists of two symmetrical semi-rings 91, which are detachably connected by screws. The outer wall of each semi-ring 91 is provided with a high-temperature resistant elastic sealing layer 92, and the inner wall is selectively provided with a high-temperature resistant elastic sealing layer 92. One end face of each semi-ring 91 is provided with a first threaded hole 93, a first limiting hole 94, and a positioning through hole 95 extending axially to the other end face. The first threaded hole 93, the first limiting hole 94, and the positioning through hole 95 form a group, and at least three groups are provided on the end face of the semi-ring 91. The other end face is provided with a second threaded hole 96, a second limiting hole 97, and a detachable... The positioning post 98 and the positioning through hole 95 extending from the other side, the second threaded hole 96, the second limiting hole 97, the positioning post 98 and the positioning through hole 95 form a group, and at least three groups are provided on this end face of the semi-ring 91. The positioning post 98 is selectively inserted into the first limiting hole 94 or the second limiting hole 97. Between two axially adjacent semi-rings 91, a screw passes through the positioning through hole 95 of one semi-ring 91 and is threadedly connected to the first threaded hole 93 or the second threaded hole 96 of the other semi-ring 91. The two end faces of the semi-ring 91 are also provided with end face sealing rings 99 made of high temperature resistant elastic sealing material.

[0064] The working principle and beneficial effects of the above technical solution: In this embodiment, the first sealing element 9 adopts a split staggered sealing structure design, so it must be composed of at least two split sealing rings. Taking the setting of only two split sealing rings as an example, the two split sealing rings are a thick ring and a thin ring, respectively. The thick ring is set close to the sealing heating chamber 1, and the thin ring is set close to the end of the non-metallic furnace tube 2.

[0065] When assembling the first sealing element 9, first assemble the two separate sealing rings, and then assemble the two separate sealing rings together.

[0066] Taking the assembly of a thick retaining ring as an example, the two semi-rings 91 of the thick retaining ring are fastened to the outer wall of the non-metallic furnace tube 2. Because the axial length of the thick retaining ring is relatively large, slots and snap-fits can be provided on the end faces of the semi-rings 91 for easy connection, such as... Figure 3 As shown, a through threaded hole is provided on the end face of the semi-ring 91. When two semi-rings 91 are fastened together, the through threaded holes on the end faces of the two semi-rings 91 correspond and are connected by screws. Thus, the two semi-rings 91 are combined to form a split sealing ring. A high-temperature resistant elastic sealing layer 92 can also be provided on the inner surface of the semi-ring 91 (increasing the sealing performance and expanding the range of outer diameters of the non-metallic furnace tube 2 that the semi-ring 91 can be used for, because after fastening, the distance between the two semi-rings 91 can be adjusted by screws, thereby adjusting the sealing performance between the high-temperature resistant elastic sealing layer 92 on the inner wall of the semi-ring 91 and the non-metallic furnace tube 2). After the thick ring is assembled on the outer wall of the non-metallic furnace tube 2, the thin ring is then assembled. It should be noted that, to facilitate the assembly between the thick and thin rings, the screws used to connect the two semi-rings 91 can be left untightened initially, and then tightened simultaneously after the last two rings are assembled. Alternatively, you can first tighten the thick buckle, then assemble the thin buckle with the thick buckle, and then tighten the two half-rings 91 of the thin buckle to fix it.

[0067] When assembling the thin and thick retaining rings (taking the case where the two half-rings 91 of the thick retaining ring are already tightened, and the screws of the two half-rings 91 of the thin retaining ring are not tightened after assembly as an example), push the thin retaining ring along the non-metallic furnace tube 2 towards the thick retaining ring until the positioning post 98 of the thick retaining ring is inserted into the first limiting hole 94 of the thin retaining ring (depending on the different insertion surfaces of the thin and thick retaining rings, it can also be that the positioning post 98 of the thin retaining ring is inserted into the first limiting hole 94 of the thick retaining ring, or it can be that the positioning post 98 of the thick retaining ring is inserted into the first limiting hole 94 of the thin retaining ring). The thin retaining ring is inserted into the positioning post 98 of the thin retaining ring and the second limiting hole 97 of the thick retaining ring. Regardless of which retaining ring's positioning post 98 is inserted into which limiting hole, the fundamental purpose is to limit the movement of the two separate sealing retaining rings by using the positioning post 98 to prevent them from rotating relative to each other. When limiting the thin and thick retaining rings by using the positioning post 98, it is necessary to ensure that the joints of the two half-rings 91 of the thick retaining ring are staggered from the joints of the two half-rings 91 of the thin retaining ring, so that the two retaining rings can seal each other.

[0068] Because the outer wall of the semi-ring 91 is provided with an elastic sealing layer 92, the assembled split sealing ring can achieve a seal between the non-metallic furnace tube 2 and the transition piece 8. The only possible place for leakage in the assembled split sealing ring is the joint between the two semi-rings 91 and the positioning through hole 95 for the screw. Therefore, at least two split sealing rings are required. An end face sealing ring 99 is provided on the end face of the semi-ring 91, and the joints of the thin and thick rings are staggered. This allows the joints to be mutually misaligned and sealed. At the same time, because of the misalignment of the joints, the end face sealing ring 99 can seal the positioning through hole 95 of the thick ring, thus achieving mutual sealing through the two split sealing rings. Then, the screw is passed through the positioning through hole 95 of the thin ring and connected to the first threaded hole 93 (or the second threaded hole 96) of the thick ring. Alternatively, the screw can be passed through the positioning through hole 95 of the thick ring and connected to the thin ring.

[0069] Because the split sealing buckle is made up of half rings 91 spliced ​​together, it is convenient and simple to operate when installing, replacing and maintaining the equipment. It can be installed and replaced by one person without supporting equipment, and each half ring 91 can be replaced individually according to the degree of damage, which saves a lot of manpower, material resources and financial resources.

[0070] This invention solves the problem of sealing the reaction atmosphere by covering the non-metallic furnace tube 2 with a sealed heating chamber 1 and pressurizing the sealed heating chamber 1 with a protective atmosphere to prevent leakage of the reaction atmosphere inside the non-metallic furnace tube 2. However, because both ends of the non-metallic furnace tube 2 need to penetrate through the sealed heating chamber 1, [the following issues arise]. Figure 1 It is clear that the function of the sealing transition piece is to prevent the reaction atmosphere from entering the sealed heating chamber 1. Therefore, how to achieve a seal between the sealed heating chamber 1 and the through-passing non-metallic furnace tube 2, so as to reduce the flow of the protective atmosphere from between the sealed heating chamber 1 and the non-metallic furnace tube 2 to the connection between the sealed heating chamber 1 and the transition piece 8, thereby reducing the leakage of the protective atmosphere, is also a problem that needs to be considered. To this end, an additional embodiment is provided, namely, the sealing transition piece also includes a second sealing piece 10. The second sealing piece 10 is located inside the sealed heating chamber 1 and is tubularly fitted to the outer wall of the non-metallic furnace tube 2. The end of the second sealing piece 10 is provided with a connecting ring 104 and an insert-type sealing ring 106. The second sealing piece 10 is selectively connected to the inner wall of the sealed heating chamber 1 through the connecting ring 104 (it should be noted that the connecting ring 104 can be provided with through holes and fixed to the inner wall of the sealed heating chamber 1 with rivets or screws, etc.). Figure 8As shown. Alternatively, a fixed connection may not be necessary, depending on the usage of the non-metallic tube furnace. For example, if this embodiment is applied to a rotatable rotary furnace, the connecting ring 104 can be fixed, keeping the second seal 10 stationary while the non-metallic furnace tube 2 rotates. Similarly, the connecting ring 104 may not be fixed, allowing the second seal 10 to rotate along with the non-metallic furnace tube 2 (the connecting ring 104 needs to be set as needed). The insertable sealing ring 106 is located between the outer wall of the non-metallic furnace tube 2 and the side wall of the sealed heating chamber 1.

[0071] The second sealing element 10 is a hollow structure consisting of an outer tube wall 101 that can deform when heated (the outer tube wall 101 is the part exposed inside the sealed heating chamber 1; the outer tube wall 101 has axially arranged protrusions, which can be wavy or any shape; their function is that when the temperature inside the sealed heating chamber 1 rises, the outer tube wall 101 can deform when heated, and the protrusions can make the outer tube wall 101 have a larger deformation than the inner tube wall 102, thereby causing the elongation direction of the inner tube wall 102 to extend towards the direction of the insertion sealing ring 106), an inner tube wall 102 attached to the outer wall of the non-metallic furnace tube 2, a deformable end 103 fixing the insertion sealing ring 106, and a connecting ring 104. One end of the outer tube wall 101 is connected to the connecting ring 104, and the other end is connected to the inner tube wall 102. One end of the inner tube wall 102 is connected to the outer tube wall 101, and the other end of the inner tube wall 102 is connected to one end of the deformable end 103. The other end of the deformable end 103 is connected to the connecting ring 104. A gap is reserved between the deformable end 103 and the outer tube wall 101. An insertion end 105 is provided on the deformable end 103, which fits against the outer wall of the non-metallic furnace tube 2. The connection between the insertion end 105 and the deformable end 103 is located at the connection between the deformable end 103 and the inner tube wall 102. An insertion sealing ring 106 is provided on the insertion end 105. There is an angle between the insertion end 105 and the deformable end 103. This angle and the reserved gap (between the deformable end 103 and the outer tube wall 101) can ensure that the deformable end 103 has a certain deformation space. Figure 8As shown, a convex ring for fixing can extend inward at the interface between the sealed heating chamber 1 and the non-metallic furnace tube 2. The convex ring can be locked within the angle between the insertion end 105 and the deformed end 103, thereby fixing the second sealing element 10. Thus, even if the connecting ring 104 is not fixed to the sealed heating chamber 1, the second sealing element 10 can still be installed on the sealed heating chamber 1 without falling off. When the sealed heating chamber 1 is filled with a high-pressure protective atmosphere, the high temperature causes the outer tube wall 101 to deform, pushing the inner tube wall 102. The inner tube wall 102 pushes the insertion end 105, allowing the insertion sealing ring 106 to be inserted more deeply into the gap between the sealed heating chamber 1 and the non-metallic furnace tube 2, thereby ensuring the sealing performance. At the same time, the deformation end 103 is subjected to deformation force, which can help to pull the insertion sealing ring 106 out of the gap when the second seal 10 is replaced. At the same time, when the deformation end 103 is deformed, its movement space is only the gap between it and the outer pipe wall 101 and the angle between the insertion end 105 and the deformation end 103. Therefore, the limited deformation range can provide a limit for the insertion end 105, preventing the insertion end 105 and the insertion sealing ring 106 from being inserted too deeply.

[0072] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0073] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0074] Although embodiments of the present invention have been disclosed above, they are not limited to the applications listed in the specification and embodiments. They can be applied to various fields suitable for the present invention. Other modifications can be easily made by those skilled in the art. Therefore, without departing from the general concept defined by the claims and their equivalents, the present invention is not limited to the specific details and illustrations shown and described herein.

Claims

1. A sealing and protective atmosphere system for a non-metallic tubular furnace, characterized in that, include: A non-metallic furnace tube (2) is installed in a sealed heating chamber (1). Both ends of the non-metallic furnace tube (2) pass through the sealed heating chamber (1), and both ends of the non-metallic furnace tube (2) are connected to the sealed heating chamber (1) through a sealing transition piece. The outlet of the non-metallic furnace tube (2) is provided with a material collection device (3) for recycling materials. An atmosphere circulation system is connected to both ends of the non-metallic furnace tube (2) via a sealed transition piece and simultaneously connected to the sealed heating chamber (1). The atmosphere circulation system is used to supply a reaction atmosphere and a protective atmosphere to the feed port of the non-metallic furnace tube (2), and to recover or treat the tail gas at the discharge port, and to supply a protective atmosphere to the sealed heating chamber (1). The sealed heating chamber (1) is equipped with a leakage protection and detection system, which is used to detect whether there is a reaction atmosphere leak in the non-metallic furnace tube (2), and to prevent the reaction atmosphere from leaking into the sealed heating chamber (1) when the reaction atmosphere leaks. The atmosphere circulation system consists of a reaction atmosphere supply end (4) that provides the reaction atmosphere, a protective atmosphere supply end (5) that provides the protective atmosphere, a circulation device (6) for gas recycling, and an exhaust gas treatment device (7) for exhaust gas discharge. The reaction atmosphere supply end (4) is connected to the feed port of the non-metallic furnace tube (2) through the first atmosphere control valve (41); The protective atmosphere supply end (5) is connected to the feed port of the non-metallic furnace tube (2) through the first protective atmosphere control valve (51); A first pressure monitor (21) is installed at the feed inlet of the non-metallic furnace tube (2). The circulation device (6) is connected to the outlet of the non-metallic furnace tube (2) through the first waste gas control valve (61); The exhaust gas treatment device (7) is connected to the outlet of the non-metallic furnace tube (2) through the second exhaust gas control valve (71); The circulation device (6) consists of a cooler (62) connected to the outlet of the non-metallic furnace tube (2) via the first exhaust gas control valve (61), an atmosphere filter (64) connecting the cooler (62) and the atmosphere recovery tank (63), and the atmosphere recovery tank (63) connected to the inlet of the non-metallic furnace tube (2) via the second atmosphere control valve (65). The protective atmosphere supply end (5) is connected to the inner top of the sealed heating chamber (1) through the second protective atmosphere control valve (52). The inner top of the sealed heating chamber (1) is also provided with a second pressure detector (11). The bottom of the sealed heating chamber (1) is provided with a first exhaust valve (12) and a second exhaust valve (13). The second protective atmosphere control valve (52), the second pressure detector (11), the first exhaust valve (12) and the second exhaust valve (13) constitute the leakage protection and detection system. The gas pressure in the sealed heating chamber (1) is not less than the gas pressure in the non-metallic furnace tube (2). The sealing transition member consists of transition members (8) disposed at both ends of the non-metallic furnace tube (2) and a first sealing member (9) sleeved on the outer wall of the non-metallic furnace tube (2) for sealing the transition members (8) and the non-metallic furnace tube (2). The first sealing element (9) is composed of two separate sealing rings. Both of the separate sealing rings are set on the outer wall of the non-metallic furnace tube (2). The outer wall of the separate sealing ring is provided with a high-temperature resistant elastic sealing layer (92). The two separate sealing rings are detachably connected. The two separate sealing rings are respectively a thick ring closer to the sealed heating chamber (1) and a thin ring farther away from the sealed heating chamber (1). The axial length of the thick ring is greater than the axial length of the thin ring. The fastening joints of the thick ring and the thin ring are staggered. The split sealing ring consists of two symmetrical semi-rings (91), which are detachably connected by screws. The outer wall of each semi-ring (91) is provided with a high-temperature resistant elastic sealing layer (92), and the inner wall is selectively provided with a high-temperature resistant elastic sealing layer (92). One end face of each semi-ring (91) is provided with a first threaded hole (93), a first limiting hole (94), and a positioning through hole (95) extending axially to the other end face. The first threaded hole (93), the first limiting hole (94), and the positioning through hole (95) form a group, and at least three groups are provided on the end face of each semi-ring (91). The other end face is provided with a second threaded hole (96), a second limiting hole (97), and a detachable positioning through hole. The column (98) and the positioning through hole (95) extending from the other side, the second threaded hole (96), the second limiting hole (97), the positioning column (98) and the positioning through hole (95) are a group, and at least three groups are provided on this end face of the half ring (91). The positioning column (98) is selectively inserted into the first limiting hole (94) or the second limiting hole (97). Between two axially adjacent half rings (91), the screw passes through the positioning through hole (95) of one half ring (91) and is threaded to the first threaded hole (93) or the second threaded hole (96) of the other half ring (91). The two end faces of the half ring (91) are also provided with end face sealing rings (99) made of high temperature resistant elastic sealing material. The sealing transition component also includes a second sealing component (10), which is located inside the sealed heating chamber (1) and is tubularly fitted onto the outer wall of the non-metallic furnace tube (2). The end of the second sealing component (10) is provided with a connecting ring (104) and an insertable sealing ring (106). The second sealing component (10) is selectively connected to the inner wall of the sealed heating chamber (1) through the connecting ring (104). The insertable sealing ring (106) is located between the outer wall of the non-metallic furnace tube (2) and the side wall of the sealed heating chamber (1). The second sealing element (10) is a hollow structure consisting of an outer tube wall (101) that can deform when heated, an inner tube wall (102) that is attached to the outer wall of the non-metallic furnace tube (2), a deformable end (103) that fixes the insertion sealing ring (106), and a connecting ring (104). One end of the outer tube wall (101) is connected to the connecting ring (104), and the other end is connected to one end of the inner tube wall (102). The other end of the inner tube wall (102) is connected to one end of the deformable end (103), and the other end of the deformable end (103) is connected to the other end of the inner tube wall (102). The deformable end (103) is connected to the connecting ring (104), and a gap is reserved between the deformable end (103) and the outer tube wall (101). The deformable end (103) is provided with an insertion end (105) that fits against the outer wall of the non-metallic furnace tube (2). The connection between the insertion end (105) and the deformable end (103) is located at the connection between the deformable end (103) and the inner tube wall (102). The insertion end (105) is provided with the insertion sealing ring (106). The insertion end (105) and the deformable end (103) have an included angle.

2. The non-metallic tubular furnace sealing protective atmosphere system according to claim 1, characterized in that, The non-metallic furnace tube (2) is either an integral piece or a multi-segment spliced ​​piece, and is made of non-metallic high-temperature resistant material.

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