High-temperature graphitization furnace capable of preventing corrosion of thermal insulation layer

Abstract

The invention relates to a high-temperature graphitization furnace capable of preventing corrosion of a heat preservation layer, and relates to the technical field of carbon / carbon composite material production, the high-temperature graphitization furnace comprises a furnace body, the heat preservation layer and a plurality of graphite electrodes are arranged on the inner wall of the furnace body, and the furnace body sequentially comprises a low-temperature area, a high-temperature area and a cooling area in the length direction of the furnace body; the vacuum air exhaust mechanism is communicated with the furnace body, and the vacuum air exhaust mechanism is located in the cooling area; the pushing air inlet mechanism communicates with the furnace body, and the pushing air inlet mechanism is located in the low-temperature area; the vacuum pumping mechanism is used for pumping out gas in the furnace body, the pushing gas inlet mechanism is used for conveying gas into the furnace body, and the vacuum pumping mechanism and the pushing gas inlet mechanism cooperate to form gas flow directionally flowing from the low-temperature area to the cooling area in the high-temperature area. Waste gas generated in the graphitization furnace can be discharged in time, a heat preservation layer and other parts in the graphitization furnace are prevented from being corroded, and then the production continuity of the graphitization furnace is enhanced.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of carbon / carbon composite material production, and particularly relates to a high-temperature graphitization furnace capable of preventing corrosion of a heat preservation layer. BACKGROUND

[0002] Carbon / carbon composite materials are widely used in high-tech fields such as aerospace, nuclear power industry and high-speed train braking due to their advantages of high-temperature resistance, low density, corrosion resistance, friction resistance and excellent thermal and electrical conductivity. In the preparation process of carbon / carbon composite materials, high-temperature graphitization process is a key link to determine the final performance of the materials. The process drives carbon atom structure rearrangement at high temperature, thereby greatly optimizing and improving the comprehensive performance of the materials.

[0003] At present, the main structure of the existing continuous high-temperature graphitization furnace generally includes a furnace body, the furnace body includes an inlet, a low-temperature zone, a high-temperature zone, a cooling zone and an outlet along the length direction of the furnace body, electrode assemblies for heating are arranged in the low-temperature zone and the high-temperature zone, a heat preservation layer composed of soft felt and hard felt is arranged on the inner wall of the furnace body in the low-temperature zone and the high-temperature zone, and the furnace body is further connected with a vacuum assembly for extracting gas in the furnace. When preparing carbon / carbon composite materials, a trolley carrying corresponding workpieces enters the furnace body from the inlet, sequentially passes through the low-temperature zone, the high-temperature zone and the cooling zone in the furnace body, and is finally sent out from the outlet of the furnace body.

[0004] In the operation process of the high-temperature graphitization furnace, especially when the trolley runs to the high-temperature zone for high-temperature treatment of the workpieces, the workpieces will emit waste gas, which generally includes corrosive gas (such as sulfur-containing and chlorine-containing compounds) and / or metal vapor (such as iron vapor). The waste gas will be in long-term contact with the heat preservation layer and the electrode assemblies and other structures in the furnace body. The corrosive gas will chemically react with the carbon-based material in the heat preservation layer, causing the heat preservation layer to become brittle, delaminate and eventually fall off. Therefore, the presence of waste gas will seriously affect the internal structure of the graphitization furnace, thereby causing the graphitization furnace to be frequently inspected and the damaged parts to be replaced, which will seriously affect the continuity of the production of the graphitization furnace. SUMMARY

[0005] The present application provides a high-temperature graphitization furnace capable of preventing corrosion of a heat preservation layer, which aims to timely discharge the waste gas generated in the graphitization furnace and prevent the heat preservation layer and other structures in the graphitization furnace from being corroded, thereby enhancing the continuity of the production of the graphitization furnace.

[0006] The high-temperature graphitization furnace capable of preventing corrosion of a heat preservation layer provided by the present application adopts the following technical scheme: The utility model provides a kind of high temperature graphitization furnace for preventing insulation layer corrosion, including furnace body, the furnace body inner wall is provided with insulation layer and several graphite electrodes, the furnace body includes low temperature zone, high temperature zone and cooling zone along the length direction of itself in sequence;Vacuum air extraction mechanism, the vacuum air extraction mechanism is communicated with the furnace body, and the vacuum air extraction mechanism is located in the cooling zone;Push air inlet mechanism, the push air inlet mechanism is communicated with the furnace body, and the push air inlet mechanism is located in the low temperature zone;The vacuum air extraction mechanism is used for extracting gas in the furnace body, the push air inlet mechanism is used for conveying gas to the furnace body, the vacuum air extraction mechanism and the push air inlet mechanism are coordinated in the high temperature zone Form directional flow of gas flow from the low temperature zone to the cooling zone.

[0007] By adopting the above technical scheme, by setting push air inlet mechanism in the low temperature zone of furnace body and vacuum air extraction mechanism in cooling zone, push air inlet mechanism slowly blows gas from low temperature zone, and vacuum air extraction mechanism continuously extracts gas in cooling zone, which can establish stable directional gas flow in high temperature zone in furnace body. When the workpiece in the high temperature zone of the furnace emits waste gas, the waste gas will be immediately captured and carried to the cooling zone by the directional gas flow, and then extracted by the vacuum air extraction mechanism.

[0008] Under such design, the state of waste gas diffusing and staying disorderly in graphitization furnace is changed, thereby reducing the contact reaction time of waste gas with insulation layer and other components in furnace, which can timely discharge waste gas generated in graphitization furnace, prevent corrosion of insulation layer and other components in graphitization furnace, and further enhance the continuity of graphitization furnace production.

[0009] Optionally, it also includes several air inlet blowing mechanisms, the air inlet blowing mechanisms are communicated with the furnace body, the air inlet blowing mechanisms are one-to-one corresponding with the graphite electrodes, and the air inlet blowing mechanisms are used for blowing gas to one end of the graphite electrode in the furnace body.

[0010] By adopting the above technical scheme, the setting of air inlet blowing mechanism can blow gas to one end of graphite electrode in the furnace body, so as to blow away waste gas around graphite electrode in time, which can further reduce the contact time of graphite electrode and waste gas, thereby preventing the deposition of metal vapor in waste gas on the surface of graphite electrode. This active preventive measure effectively avoids serious safety accidents such as graphite electrode sparking and even short circuiting and firing caused by gradually accumulated metal deposits forming conductive path.

[0011] Optionally, the air inlet blowing mechanism comprises a blowing sleeve and a blowing power assembly, the blowing power assembly is in communication with the blowing sleeve, and the blowing power assembly is used for conveying gas towards the blowing sleeve; the blowing hole is formed through the furnace body side wall, the blowing sleeve is sleeved on the graphite electrode outer side, and the blowing sleeve is inserted into the blowing hole, the blowing sleeve inner side wall is arranged in a spaced manner with the graphite electrode outer side wall, and the blowing sleeve is connected to the graphite electrode at one end of the furnace body.

[0012] By adopting the above technical scheme, the air inlet blowing mechanism is provided by cooperation of the blowing sleeve and the blowing power assembly, the blowing sleeve is sleeved on the graphite electrode outer side, thereby naturally forming an annular gas flow channel between the graphite electrode and the blowing sleeve. The gas conveyed by the blowing power assembly is uniformly introduced into the annular gas flow channel, thereby being sprayed around the graphite electrode to form a protective gas curtain on the graphite electrode outer side, and the formation of the protective gas curtain can comprehensively protect the graphite electrode.

[0013] Optionally, the vacuum air extraction mechanism comprises an air extraction pipe and an air extraction power assembly, one end of the air extraction pipe is in communication with the furnace body, the other end is in communication with the air extraction power assembly, and the air extraction power assembly is used for extracting gas from the furnace body.

[0014] By adopting the above technical scheme, the air extraction power assembly provides a power source for extracting gas, and the air extraction pipe constitutes a physical channel connecting the furnace body and the air extraction power assembly, and the two cooperate to forcibly extract the waste gas pushed by the directional gas flow to the cooling area from the furnace body, thereby completing the entire controlled process from generation to exhaust of the waste gas.

[0015] Optionally, the air extraction pipe is provided with a water cooling assembly, and the water cooling assembly is used for cooling the gas passing through the air extraction pipe.

[0016] By adopting the above technical scheme, although the temperature of the waste gas extracted from the cooling area is reduced, there is still a great influence on the entire air extraction power assembly. Therefore, by arranging the water cooling assembly on the air extraction pipe, the gas in the air extraction pipe can be forcibly and quickly pre-cooled before entering the air extraction power assembly. This protects the air extraction power assembly from being baked by high temperature and failing or aging, thereby ensuring the sealing property and long-term operation reliability of the air extraction power assembly.

[0017] Optionally, the air extraction power assembly comprises a first pump group and a second pump group, and the first pump group and the second pump group are both in communication with the air extraction pipe.

[0018] By adopting the technical scheme, the air exhaust power assembly adopts a redundant design of double pump sets in parallel, and only the first pump set can be enabled to work when the equipment is normally operated. When the first pump set needs to be maintained or unexpectedly fails, the second pump set can be immediately started to replace the work, without the need to stop the operation of the entire graphitization furnace. This design ensures the continuity of the vacuum air exhaust function, avoids unplanned shutdown caused by single-point failure of the air exhaust power assembly, and improves the production efficiency and operation reliability of the continuous high-temperature graphitization furnace.

[0019] Optionally, the air exhaust power assembly further comprises a connecting pipeline, one end of the connecting pipeline is in communication with the air exhaust pipe, the other end of the connecting pipeline is in communication with the first pump set and the second pump set, a butterfly valve and a filter are arranged on the connecting pipeline, and the butterfly valve is located between the air exhaust pipe and the filter along the length direction of the connecting pipeline.

[0020] By adopting the technical scheme, the filter is used to capture dust and condensate entrained in the exhaust gas, and is a key component for protecting the first pump set and the second pump set, but the filter itself needs to be cleaned regularly. The butterfly valve is installed at the front end of the filter, so that when the filter needs to be maintained, the butterfly valve can be closed first to temporarily isolate the filter from the high temperature and vacuum environment of the furnace body. This allows the maintenance personnel to clean or replace the filter element online without stopping the furnace.

[0021] Optionally, the vacuum air exhaust mechanism further comprises an air outlet plug, the heat preservation layer is provided with a waste gas outlet penetratingly formed therein, the waste gas outlet is in communication with the air exhaust pipe, and the air outlet plug is in plug-in cooperation with the waste gas outlet; a serpentine air channel penetratingly formed in the air outlet plug has a non-straight axis, and the serpentine air channel is used to guide the gas in the furnace body into the air exhaust pipe.

[0022] By adopting the technical scheme, based on the cooperation design of the waste gas outlet and the air outlet plug, the exhaust gas removed from the furnace body can only be discharged from the serpentine air channel. Since the serpentine air channel has a tortuous path, the straight-line radiation path of heat is effectively blocked, thereby forming a heat labyrinth effect, reducing the heat loss at the waste gas outlet, and ensuring the overall heat preservation performance of the heat preservation layer.

[0023] Optionally, the air pushing mechanism comprises a blowing pipe and a blowing power assembly, one end of the blowing pipe is in communication with the furnace body, the other end of the blowing pipe is in communication with the blowing power assembly, and the blowing power assembly is used to deliver gas into the furnace body.

[0024] By adopting the technical scheme, the blowing power assembly provides controllable gas sources, and the blowing pipe delivers the gas to the designated position of the low-temperature zone of the furnace body. By adjusting the blowing power assembly, the flow and speed of the blowing gas can be accurately controlled, so as to establish a stable and slow directional gas flow in the furnace, effectively push and carry the waste gas in the high-temperature zone, and avoid disturbing the stability of the process in the furnace due to excessive gas flow.

[0025] Optionally, the gas heat exchange mechanism is further included, the gas suction pipe, the gas heat exchange mechanism and the gas suction power assembly are sequentially communicated, the gas blowing pipe, the gas heat exchange mechanism and the gas blowing power assembly are sequentially communicated, and the gas heat exchange mechanism is used for heat exchange between the gas sucked out of the furnace body by the gas suction power assembly and the gas input into the furnace body by the gas blowing power assembly.

[0026] By adopting the technical scheme, under the action of the gas heat exchange mechanism, an efficient energy recovery path is established outside the furnace body. Specifically, the high-temperature waste gas sucked out of the furnace body and the low-temperature gas about to be input into the furnace body are introduced into the gas heat exchange mechanism at the same time, so that the high-temperature waste gas and the low-temperature gas are heat exchanged, and then the high-temperature waste gas is sent into the gas suction power assembly after being cooled, and the low-temperature gas is sent into the furnace body after being heated. Under such design, on the one hand, the high-temperature waste gas is significantly cooled, further protecting the downstream gas suction power assembly from heat damage; on the other hand, the low-temperature gas entering the furnace body is effectively preheated, avoiding local thermal shock and temperature fluctuation when the low-temperature gas directly enters the furnace body, ensuring the stability of the process, and reducing the additional energy consumption required for heating the gas to the process temperature, significantly improving the overall energy utilization rate of the equipment, and achieving the effect of energy saving.

[0027] In summary, the present application has at least one of the following beneficial technical effects: 1. The present application establishes a stable directional gas flow in the furnace by setting the pushing air inlet mechanism in the low-temperature zone and the vacuum gas suction mechanism in the cooling zone, and actively carries the waste gas generated in the high-temperature zone to the cooling zone for discharge, thereby reducing the reaction time of the waste gas with the insulation layer and other components in the furnace, which can timely discharge the waste gas generated in the graphitization furnace, prevent the corrosion of the insulation layer and other components in the graphitization furnace, and further enhance the continuity of the graphitization furnace production.

[0028] 2. The present application forms a protective gas curtain around the graphite electrode by setting the air inlet blowing mechanism corresponding to the graphite electrode, effectively prevents the deposition of impurities such as metal vapor in the waste gas on the surface of the graphite electrode, thereby reducing the risk of graphite electrode sparking and short circuit, and improving the safety of equipment operation.

[0029] 3. The application avoids local thermal shock and temperature fluctuation caused by low-temperature gas directly entering the furnace body, and ensures the stability of the process. BRIEF DESCRIPTION OF DRAWINGS

[0030] Figure 1 is the overall structure schematic diagram of the graphitization furnace of the embodiment 1 of the application.

[0031] Figure 2 is the cross-sectional structure schematic diagram of the connection between the gas blowing mechanism and the furnace body of the embodiment 1 of the application.

[0032] Figure 3 is the overall structure schematic diagram of the vacuum air extraction mechanism of the embodiment 1 of the application.

[0033] Figure 4 is the cross-sectional structure schematic diagram of the connection between the vacuum air extraction mechanism and the furnace body of the embodiment 1 of the application.

[0034] Figure 5 is the overall structure schematic diagram of the filter of the embodiment 1 of the application.

[0035] Figure 6 is the cross-sectional structure schematic diagram of the gas outlet plug of the embodiment 1 of the application.

[0036] Figure 7 is the cross-sectional structure schematic diagram of the connection between the gas pushing mechanism and the furnace body of the embodiment 1 of the application.

[0037] Figure 8 is the overall structure schematic diagram of the graphitization furnace of the embodiment 2 of the application.

[0038] Figure 9 is the cross-sectional structure schematic diagram of the gas heat exchange mechanism of the embodiment 2 of the application.

[0039] In the figure, 1, furnace body; 11, low temperature zone; 12, high temperature zone; 13, temperature reduction zone; 2, heat preservation layer; 3, graphite electrode; 31, electrode hole; 32, graphite sleeve; 4, vacuum air extraction mechanism; 41, air extraction pipe; 42, air extraction power assembly; 421, connecting pipe; 422, first pump group; 423, second pump group; 424, butterfly valve; 425, trap; 426, filter; 4261, cylinder shell; 4262, first connecting pipe; 4263, second connecting pipe; 4264, closing cover; 4265, filter element; 43, air suction port; 44, waste gas outlet; 45, water cooling assembly; 451, water cooling jacket; 452, water cooling circulation part; 46, air outlet plug; 461, mounting pipe; 462, plug; 463, first through hole; 464, second through hole; 47, serpentine air passage; 5, air pushing mechanism; 51, air blowing pipe; 52, air blowing power assembly; 521, air supply pipe; 522, first air source; 523, first mass flow meter; 524, first electromagnetic valve; 53, air inlet; 6, air blowing mechanism; 61, blowing sleeve; 62, blowing power assembly; 621, blowing pipe; 622, second air source; 623, second mass flow meter; 624, second electromagnetic valve; 63, blowing hole; 7, gas heat exchange mechanism; 71, vertical tank; 711, cold gas inlet pipe; 712, cold gas outlet pipe; 713, hot gas inlet pipe; 714, hot gas outlet pipe; 715, support ring; 716, working port; 717, closing door; 72, condensing pipe; 721, separation disc; 722, air hole; 723, sealing rubber ring; 73, heat exchange interlayer. DETAILED DESCRIPTION

[0040] The following will be described in detail with reference to the accompanying drawings. Figure 1 - the accompanying drawings Figure 9 The present application will be described in further detail.

[0041] Embodiment 1: A high temperature graphitization furnace for preventing corrosion of heat preservation layer, referring to Figure 1 and Figure 2 , comprising a furnace body 1, the furnace body 1 sequentially comprises a low temperature zone 11, a high temperature zone 12 and a temperature reduction zone 13 along the length direction of the furnace body 1, a heat preservation layer 2 and a plurality of graphite electrodes 3 are arranged on the inner wall of the furnace body 1, and the graphite electrodes 3 are distributed in the high temperature zone 12 and the low temperature zone 11. The furnace body 1 is also provided with a vacuum air extraction mechanism 4, an air pushing mechanism 5 and a plurality of air blowing mechanisms 6, the vacuum air extraction mechanism 4, the air pushing mechanism 5 and the air blowing mechanism 6 are all communicated with the furnace body 1, the vacuum air extraction mechanism 4 is located in the temperature reduction zone 13, the air pushing mechanism 5 is located in the low temperature zone 11, and the air blowing mechanism 6 is arranged one by one corresponding to the graphite electrode 3.

[0042] Under the cooperation of the vacuum air extraction mechanism 4, the air pushing mechanism 5 and the air blowing mechanism 6, the directional air flow is established from the low-temperature zone 11 to the cooling zone 13 in the graphitization furnace, so that the waste gas volatilized from the workpiece is carried and pushed to the cooling zone 13 by the directional air flow, and then is extracted from the graphitization furnace by the vacuum air extraction mechanism 4, which can prevent the waste gas from damaging the internal structure of the graphitization furnace. With reference to Figure 2 In the embodiment, the furnace body 1 is preferably a water-cooled furnace, a water-cooled jacket is formed in the side wall of the furnace body 1, and the water-cooled jacket is communicated with a water-cooled circulating pump through a pipeline, so that cooling water can be input into the water-cooled jacket, thereby ensuring the low temperature of the side wall of the furnace body 1.

[0043] With reference to Figure 3 And Figure 4 The vacuum air extraction mechanism 4 comprises an air extraction pipe 41 and an air extraction power assembly 42, one end of the air extraction pipe 41 is communicated with the furnace body 1, and the other end is communicated with the air extraction power assembly 42.

[0044] Based on the structural design of the vacuum air extraction mechanism 4, under the action of the air extraction power assembly 42, the air extraction pipe 41 can extract the gas in the graphitization furnace, ensuring that the waste gas in the graphitization furnace is forcedly discharged from the top of the cooling zone 13, forming a clear and controlled waste gas discharge path.

[0045] With reference to Figure 1 And Figure 4 In the embodiment, the furnace body 1 is preferably a water-cooled furnace, a water-cooled jacket is formed in the side wall of the furnace body 1, and the water-cooled jacket is communicated with a water-cooled circulating pump through a pipeline, so that cooling water can be input into the water-cooled jacket, thereby ensuring the low temperature of the side wall of the furnace body 1.

[0046] With reference to Figure 3 The vacuum air extraction mechanism 4 further comprises a water-cooled assembly 45, the water-cooled assembly 45 comprises a water-cooled jacket 451 and a water-cooled circulating member 452, the water-cooled circulating member 452 adopts a circulating pump, and the water-cooled circulating member 452 is communicated with the water-cooled jacket 451 through a pipeline. The water-cooled jacket 451 is sleeved outside the air extraction pipe 41, and the water-cooled jacket 451 is fixedly connected with the air extraction pipe 41.

[0047] When the high-temperature waste gas is extracted through the air extraction pipe 41, the water-cooled circulating member 452 sends cooling water to the water-cooled jacket 451, so as to forcibly cool the high-temperature waste gas in the air extraction pipe 41, which can protect the air extraction power assembly 42. With reference to Figure 3The air extraction power assembly 42 comprises a connecting pipe 421, a first pump set 422 and a second pump set 423. The connecting pipe 421 is sequentially provided with a trap 425, a butterfly valve 424 and a filter 426 along the length direction of the connecting pipe 421. One end of the connecting pipe 421 is in communication with the air extraction pipe 41, and the other end is in communication with the first pump set 422 and the second pump set 423. The trap 425 is located between the air extraction pipe 41 and the butterfly valve 424 along the length direction of the connecting pipe 421.

[0048] The parallel connection of the first pump set 422 and the second pump set 423 to the connecting pipe 421 enables the second pump set 423 to be quickly switched to use when the first pump set 422 fails, thereby improving the continuity and reliability of the operation of the air extraction power assembly 42.

[0049] The trap 425 is arranged to preliminarily intercept larger particulate pollutants or easily condensed steam in the exhaust gas. The filter 426 is arranged to further capture particulate matters and condensed metal steam carried in the exhaust gas. Thus, the filter 426 and the trap 425 work together to achieve secondary purification of the exhaust gas. The trap 425 first intercepts large particles and easily condensed steam, and the filter 426 further removes small particles and corrosive substances, thereby ensuring the cleanliness of the final exhaust gas.

[0050] With reference to Figure 3 In the embodiment, the first pump set 422 and the second pump set 423 have the same structure. Specifically, the first pump set 422 at least comprises a Roots pump and a slide valve pump connected in series. The Roots pump is used for rapid air extraction, and the slide valve pump is used as a front-stage pump. The combination of the two can achieve high vacuum degree and large extraction speed, thereby ensuring the air extraction power of the vacuum air extraction mechanism 4. With reference to Figure 3 and Figure 5 The filter 426 comprises a cylinder shell 4261. An axial end of the cylinder shell 4261 is coaxially connected with a first connecting pipe 4262. An outer side wall of the cylinder shell 4261 is connected with a second connecting pipe 4263. The axial direction of the first connecting pipe 4262 is perpendicular to the axial direction of the second connecting pipe 4263. Flanges are coaxially arranged on the first connecting pipe 4262 and the second connecting pipe 4263. When the filter 426 is connected to the connecting pipe 421, the connecting pipe 421 and the first connecting pipe 4262 and the second connecting pipe 4263 are connected by the flanges. An end of the cylinder shell 4261 away from the first connecting pipe 4262 is provided with a closure cover 4264. The closure cover 4264 is connected to the cylinder shell 4261 by bolts, and the closure cover 4264 closes the end of the cylinder shell 4261 away from the first connecting pipe 4262. A filter core 4265 is coaxially inserted into the cylinder shell 4261.

[0051] The filter 426 is designed to be detachable. When the filter core 4265 needs to be replaced, the butterfly valve 424 is closed, the closing cover 4264 is removed, and the new filter core 4265 is replaced, which facilitates the continuous operation of the filter 426.

[0052] With reference to Figure 3 and Figure 5 In the embodiment, the filter core 4265 in the filter 426 is made of high-temperature-resistant and corrosion-resistant sintered stainless steel or metal fiber felt, which can effectively intercept metal vapor condensate and dust particles and withstand the erosion of high-temperature and corrosive gas. The trap 425 can adopt a labyrinth structure with multiple baffles arranged inside. This structure forces the exhaust gas to change direction multiple times when passing through, so that heavier particles and easily condensing vapor are deposited in the trap 425 due to inertial impact, achieving efficient preliminary separation.

[0053] With reference to Figure 4 and Figure 6 The heat preservation layer 2 is provided with an air outlet plug 46 which is inserted and matched with the exhaust gas outlet 44, and the air outlet plug 46 is detachably connected with the heat preservation layer 2. The air outlet plug 46 is provided with a serpentine air channel 47 which is in communication with the space in the heat preservation layer 2 at one end and in communication with the suction pipe 41 at the other end, and the central axis of the serpentine air channel 47 is arranged in a non-straight line.

[0054] According to the design of the air outlet plug 46, the exhaust gas in the heat preservation layer 2 needs to pass through the serpentine air channel 47 to be sucked into the suction pipe 41. Since the serpentine air channel 47 is designed in a non-straight line, the exhaust gas needs to flow forcibly in the serpentine air channel 47, thereby effectively preventing the heat in the furnace body 1 from penetrating through the heat preservation layer 2 in a straight-line radiation manner. This can establish a heat shield at the position of the exhaust gas outlet 44, thereby reducing the heat loss in the furnace body 1 while ensuring the normal flow of exhaust gas, so as to ensure the heat preservation performance of the heat preservation layer 2.

[0055] With reference to Figure 6The vent plug 46 includes an installation tube 461, within which a plurality of plugs 462 are disposed. These plugs 462 are sequentially arranged along the axial direction of the installation tube 461, with adjacent plugs 462 abutting against each other along the axial direction of the installation tube 461. The plugs 462 are inserted into and seal the installation tube 461. One plug 462 has a plurality of first through holes 463, and an adjacent plug 462 has a plurality of second through holes 464. The axis of each first through hole 463 is parallel to and spaced apart from the axis of all the second through holes 464 on the adjacent plug 462, and each first through hole 463 communicates with at least one second through hole 464 on the adjacent plug 462. Thus, along the axial direction of the installation tube 461, the sequentially connected first through holes 463 and second through holes 464 form a meandering air passage 47, thereby creating a plurality of meandering air passages 47 within the installation tube 461.

[0056] Based on this design where the first air passage and the second through hole 464 are alternately interspersed, the winding air passage 47 is established through modular design, which facilitates the processing and manufacturing of the air outlet plug 46.

[0057] In this embodiment, the mounting tube 461 is connected to the insulation layer 2 by screws. This achieves a detachable connection between the vent plug 46 and the insulation layer 2, ensuring the stability of the vent plug 46 installation on the one hand, and facilitating the disassembly and cleaning of the vent plug 46 on the other.

[0058] Reference Figure 1 and Figure 7 The air intake mechanism 5 includes an air blowing pipe 51 and an air blowing power assembly 52. ​​One end of the air blowing pipe 51 is connected to the furnace body 1, and the other end is connected to the air blowing power assembly 52.

[0059] In this embodiment, an air inlet 53 is provided at the bottom of the furnace body 1, and the air inlet 53 penetrates the corresponding insulation layer 2. The air inlet 53 is located in the low temperature zone 11. One end of the air blowing pipe 51 is coaxially inserted with the air inlet 53 and extends into the space inside the insulation layer 2.

[0060] Under the action of the blowing power component 52, the blowing pipe 51 can blow protective gas into the graphitization furnace, thereby forming a stable directional airflow from the low temperature zone 11 to the cooling zone 13 in the graphitization furnace. This directional airflow acts as a driving force, carrying the waste gas generated in the high temperature zone 12 and actively pushing the waste gas to the cooling zone 13, thereby preventing the waste gas from spreading or lingering in the graphitization furnace in a disorderly manner. Reference Figure 7 The air blowing power assembly 52 includes an air supply pipe 521. One end of the air supply pipe 521 is connected to the end of the air blowing pipe 51 away from the furnace body 1, and the other end is connected to the first air source 522. A first mass flow meter 523 and a first solenoid valve 524 are sequentially installed on the air supply pipe 521.

[0061] The first gas source 522 is used to provide protective gas, such as argon or nitrogen. The first electromagnetic valve 524 is used to control the opening and closing of the gas supply pipeline 521. The first mass flow meter 523 is used to accurately control the gas flow. This can ensure that the gas flow delivered by the blowing power assembly 52 to the blowing pipe 51 is stable and controllable, and can avoid causing a sharp disturbance to the pressure and temperature in the graphitization furnace.

[0062] With reference to Figure 1 and Figure 2 , the air inlet blowing mechanism 6 comprises a blowing sleeve 61, which is sleeved outside the corresponding graphite electrode 3, the inner side wall of the blowing sleeve 61 is arranged in a spaced manner with the outer side wall of the corresponding graphite electrode 3, and the blowing sleeve 61 is communicated with a blowing power assembly 62.

[0063] In this embodiment, the blowing hole 63 is formed in the furnace body 1, the electrode hole 31 is formed in the heat preservation layer 2, the blowing hole 63 is coaxially communicated with the electrode hole 31, the blowing sleeve 61 is in plug-in cooperation with the blowing hole 63, and one end of the graphite electrode 3 is in plug-in cooperation with the electrode hole 31 and extends into the space in the heat preservation layer 2.

[0064] When the blowing power assembly 62 supplies the protective gas to the blowing sleeve 61, the protective gas flows between the blowing sleeve 61 and the corresponding graphite electrode 3, and is blown into the high-temperature graphite furnace, which can form a protective gas curtain outside the graphite electrode 3. The formation of the protective gas curtain can prevent the metal vapor in the exhaust gas from contacting the graphite electrode 3.

[0065] At the same time, the air inlet blowing mechanism 6 can also input the protective gas into the graphitization furnace, thereby assisting the air inlet structure to push the gas into the graphitization furnace, and further improving the continuity and stability of the directional gas flow in the graphitization furnace.

[0066] With reference to Figure 2 In this embodiment, the graphite sleeve 32 is inserted into the electrode hole 31, the graphite electrode 3 is in plug-in cooperation with the graphite sleeve 32, the inner side wall of the graphite sleeve 32 is arranged in a spaced manner with the outer side wall of the graphite electrode 3, the inner diameter of the graphite sleeve 32 is smaller than the inner diameter of the blowing sleeve 61, and one end of the blowing sleeve 61 extends to between the inner side wall of the furnace body 1 and the outer side wall of the heat preservation layer 2 and is in communication with the graphite sleeve 32 in a facing manner.

[0067] The cooperation of the graphite sleeve 32 and the blowing sleeve 61 has the following effects. On the one hand, the graphite sleeve 32 can strengthen the structure of the electrode hole 31 on the heat preservation layer 2 and protect the electrode hole 31 from being eroded by the high-temperature waste gas, and can also regularize the blowing air flow so that the air flow can be stably introduced into the annular gap between the graphite electrode 3 and the graphite sleeve 32. On the other hand, the air flow blown by the blowing sleeve 61 can flow along the annular gap between the graphite electrode 3 and the graphite sleeve 32 to form a uniform air curtain, which can isolate the waste gas in the form of a positive pressure barrier, thereby preventing the metal vapor in the waste gas from depositing on the surface of the graphite electrode 3, and preventing the graphite electrode 3 from being ignited or short-circuited due to the conduction of the deposit.

[0068] With reference to Figure 2 In this embodiment, the blowing sleeve 61 is arranged at one end outside the furnace body 1 and is connected with the corresponding graphite electrode 3. The blowing sleeve 61 extends to the space between the inner wall of the furnace body 1 and the outer wall of the heat preservation layer 2 at one end inside the furnace body 1, and the one end of the blowing sleeve 61 inside the furnace body 1 is coaxially arranged opposite to the corresponding graphite sleeve 32.

[0069] In this design, the blowing sleeve 61 constitutes a gas conveying channel of the graphite sleeve 32. The protective gas from the blowing power assembly 62 enters the blowing sleeve 61 through the blowing sleeve 61 and is guided to the graphite sleeve 32, and finally is sprayed to form a protective air curtain.

[0070] In this embodiment, the design of the blowing sleeve 61 can be improved by the electrode seat for mounting the graphite electrode 3. Specifically, the function of the blowing sleeve 61 can be realized by arranging a blowing port on the electrode seat towards the corresponding graphite sleeve 32. Similarly, in this embodiment, the blowing sleeve 61 also has the function of the electrode seat, and realizes the mounting and fixing of the corresponding graphite electrode 3.

[0071] With reference to Figure 2 The blowing power assembly 62 comprises a blowing pipeline 621, one end of the blowing pipeline 621 is communicated with the blowing sleeve 61, the other end of the blowing pipeline 621 is communicated with a second gas source 622, and a second mass flow meter 623 and a second electromagnetic valve 624 are arranged on the blowing pipeline 621 in sequence.

[0072] The blowing power assembly 62 can realize accurate control of the protective gas flow. The second gas source 622 is used to provide the protective gas. The second electromagnetic valve 624 is used to control the start and stop of the gas flow or realize intermittent blowing according to the process requirement. The second mass flow meter 623 is used to monitor and accurately adjust the blowing gas flow in real time, so that the graphite electrode 3 can obtain a stable and sufficient protective air curtain, which can effectively prevent the metal vapor from adhering, and can also avoid the interference on the overall gas pressure and directional air flow in the graphitization furnace caused by too much protective gas blowing.

[0073] The implementation principle of the embodiment of the present application is that when the graphitization furnace is working, the vacuum air extraction mechanism 4 works to establish a stable suction force at the top of the cooling zone 13 of the graphitization furnace, and the air inlet mechanism 5 pushes the protective gas to be blown into the low-temperature zone 11 at the bottom of the graphitization furnace, so that the protective gas automatically flows from the low-temperature zone 11 to the cooling zone 13, and then a controlled directional gas flow is established in the graphitization furnace and pushed from the low-temperature zone 11 to the cooling zone 13.

[0074] When the workpiece located in the high-temperature zone 12 of the graphitization furnace emits waste gas, the directional gas flow actively carries and pushes the waste gas to the cooling zone 13, and is finally extracted by the vacuum air extraction mechanism 4, which can reduce the contact and penetration of corrosive gas in the waste gas with the heat preservation layer 2, thereby preventing the corrosion of the heat preservation layer 2; and can also reduce the contact of metal vapor in the waste gas with the graphite electrode 3, thereby reducing the deposition of metal vapor on the graphite electrode 3.

[0075] At the same time, the air inlet blowing mechanism 6 works to form a protective air curtain around the graphite electrode 3, which can further prevent the deposition of metal vapor in the electrode gap and prevent the short circuit of the electrode.

[0076] Embodiment 2: A high-temperature graphitization furnace for preventing corrosion of a heat preservation layer, referring to Figure 8 and Figure 9 The difference between the present embodiment and embodiment 1 is that the graphitization furnace further comprises a gas heat exchange mechanism 7, the gas heat exchange mechanism 7 is located between the air extraction pipe 41 and the air extraction power assembly 42, and the air extraction pipe 41, the gas heat exchange mechanism 7 and the air extraction power assembly 42 are sequentially communicated. The gas heat exchange mechanism 7 is located between the air blowing pipe 51 and the air blowing power assembly 52, and the air blowing pipe 51, the gas heat exchange mechanism 7 and the air blowing power assembly 52 are sequentially communicated. The gas heat exchange mechanism 7 is located between the air blowing sleeve pipe 61 and the air blowing power assembly 62, and the air blowing sleeve pipe 61, the gas heat exchange mechanism 7 and the air blowing power assembly 62 are sequentially communicated.

[0077] Based on the arrangement of the gas heat exchange mechanism 7, the heat of the high-temperature waste gas extracted from the air extraction pipe 41 can be used to preheat the low-temperature gas about to enter the graphitization furnace through the air blowing pipe 51 and the air blowing sleeve pipe 61. This design, on the one hand, effectively cools the high-temperature waste gas before it enters the air extraction power assembly 42, protecting the air extraction power assembly 42; on the other hand, preheats the low-temperature gas entering the graphitization furnace to the required temperature, avoiding the thermal shock of the low-temperature gas to the graphitization furnace, thereby ensuring the thermal efficiency and process stability of the graphitization furnace.

[0078] Referring to Figure 8 and Figure 9, the gas heat exchange mechanism 7 comprises a vertical tank 71, the vertical tank 71 is internally provided with a condensing pipe 72, the condensing pipe 72 is coaxially arranged with the vertical tank 71, both ends of the condensing pipe 72 are connected with the vertical tank 71, and both ends of the condensing pipe 72 are closed by the vertical tank 71. The bottom of the vertical tank 71 is provided with a cold gas inlet pipe 711, the top of the vertical tank 71 is provided with a cold gas outlet pipe 712, and the cold gas inlet pipe 711, the condensing pipe 72 and the cold gas outlet pipe 712 are sequentially communicated from bottom to top. The inner side wall of the vertical tank 71 and the outer side wall of the condensing pipe 72 are spaced apart to form a heat exchange interlayer 73, and the outer side wall of the vertical tank 71 is provided with a hot gas inlet pipe 713 and a hot gas outlet pipe 714, and the hot gas inlet pipe 713 and the hot gas outlet pipe 714 are both communicated with the heat exchange interlayer 73, and the hot gas inlet pipe 713 is located above the hot gas outlet pipe 714 in the vertical direction.

[0079] With reference to Figure 8 and Figure 9 , one end of the exhaust pipe 41 is communicated with the hot gas inlet pipe 713 through a pipeline, and one end of the gas supply pipeline 421 in the exhaust power assembly 42 is communicated with the hot gas outlet pipe 714.

[0080] With reference to Figure 8 and Figure 9 , one end of the blowing pipe 51 is communicated with the cold gas outlet pipe 712 through a pipeline, and one end of the gas supply pipeline 521 in the blowing power assembly 52 is communicated with the cold gas inlet pipe 711.

[0081] With reference to Figure 8 and Figure 9 , the blowing sleeve pipe 61 is communicated with the cold gas outlet pipe 712 through a pipeline, and one end of the blowing pipeline 621 in the blowing power assembly 62 is communicated with the cold gas inlet pipe 711.

[0082] In this design, the low-temperature clean gas from the blowing power assembly 62 and the blowing power assembly 52 flows through the cold gas inlet pipe 711, the condensing pipe 72 and the cold gas outlet pipe 712 in sequence, and is finally sent into the furnace body 1 from the blowing sleeve pipe 61 and the blowing pipe 51 respectively. At the same time, the high-temperature waste gas from the cooling zone 13 in the furnace body 1 flows through the exhaust pipe 41, the hot gas inlet pipe 713, the heat exchange interlayer 73 and the heat exchange outlet pipe in sequence, and is finally exhausted by the exhaust power assembly 42.

[0083] In this process, when the high-temperature waste gas enters the heat exchange interlayer 73 and the low-temperature clean gas enters the condensing pipe 72, the high-temperature waste gas exchanges heat with the low-temperature clean gas in the condensing pipe 72, so that the high-temperature waste gas is cooled, and the metal vapor and other substances carried by the high-temperature waste gas are sublimed or condensed due to the decrease in temperature, and are attached to the outer wall of the condensing pipe 72, so as to be captured; and the low-temperature clean gas in the condensing pipe 72 is heated, so as to realize preheating.

[0084] In another embodiment, since the protective gas blown into the furnace body 1 by the pushing air inlet mechanism 5 and the air blowing mechanism 6 is the same, and the blowing power assembly 52 and the blowing power assembly 62 are the same structure, only a single blowing power assembly 52 can be used to input gas into the condensing pipe 72. Through such a design, not only the number of gas sources is simplified, the equipment cost and the occupied space are reduced, but also the control system is simplified.

[0085] With reference to Figure 9 , the condensing pipe 72 is sleeved with a plurality of partition plates 721, the partition plates 721 are located in the heat exchange layer 73, a plurality of partition plates 721 are sequentially and vertically spaced, and a plurality of partition plates 721 are vertically located between the hot gas inlet pipe 713 and the hot gas outlet pipe 714. The partition plate 721 is provided with a plurality of air holes 722 penetratingly arranged on the partition plate 721, and a plurality of air holes 722 are sequentially and vertically staggered. The partition plate 721 is sleeved with a sealing rubber ring 723, and the outer side wall of the sealing rubber ring 723 abuts against the inner side wall of the vertical tank 71.

[0086] The arrangement of the partition plate 721 can forcibly change the flow path of the high-temperature waste gas in the heat exchange layer 73. Specifically, the sealing rubber ring 723 ensures that the waste gas cannot leak from the outer edge of the partition plate 721, but is forced to pass through the air holes 722 on the partition plate 721. Since the plurality of air holes 722 are staggered from top to bottom, the flow path of the high-temperature waste gas in the heat exchange layer 73 is lengthened, forming an S-shaped or labyrinthine flow.

[0087] Under such a design, on the one hand, the contact time and heat exchange efficiency of the waste gas and the outer wall of the condensing pipe 72 are increased; on the other hand, the waste gas is forced to impact the surface of the condensing pipe 72 and the partition plate 721 multiple times during the flow process, thereby increasing the collision, condensation and adhesion probability of metal vapor and other condensates on these surfaces, thereby realizing efficient cooling, trapping and purification.

[0088] With reference to Figure 9 , in this embodiment, the air holes 722 on the adjacent two partition plates 721 are arranged along the corresponding radial direction of the condensing pipe 72, and the condensing pipe 72 is located between the two air holes 722 on the adjacent two partition plates 721.

[0089] Based on the staggered layout design of a plurality of air holes 722, after the waste gas passes through a layer of partition plate 721, it must flow horizontally through the heat exchange layer 73 and bypass the condensing pipe 72 to reach the air hole 722 of the next layer of partition plate 721, thereby maximizing the scouring of the gas flow to the outer wall of the condensing pipe 72, and further improving the heat exchange and trapping effect.

[0090] With reference to Figure 9In the embodiment, the partition disc 721 is slidingly connected with the outer wall of the condensing pipe 72 in the vertical direction, and the partition disc 721 is rotationally arranged with the condensing pipe 72, and the partition disc 721 is connected with the condensing pipe 72 through bolts. The outer wall of the sealing rubber ring 723 is slidingly arranged with the inner wall of the vertical tank 71.

[0091] Based on the connection relationship between the partition disc and the condensing pipe 72, when cleaning is needed, the condensing core composed of the entire condensing pipe 72 and the partition disc 721 can be conveniently disassembled or moved, thereby facilitating the cleaning and maintenance of the condensate attached to the outer wall of the partition disc 721 and the condensing pipe 72.

[0092] Referring to Figure 9 In the embodiment, two support rings 715 are arranged in the vertical tank 71, and the two support rings 715 are arranged at intervals in the vertical direction, and the hot gas inlet pipe 713 and the hot gas outlet pipe 714 are located between the two support rings 715 in the vertical direction. The support ring 715 is coaxially arranged with the vertical tank 71, and the outer wall of the support ring 715 is fixedly connected with the inner wall of the vertical tank 71. The condensing pipe 72 is located between the two support rings 715, and the two ends of the condensing pipe 72 are respectively connected with the corresponding support rings 715, and the condensing pipe 72 is rotationally connected with the support ring 715.

[0093] With the cooperation of the two support rings 715 and the inner wall of the vertical tank 71, the installation of the condensing pipe 72 is realized at the same time, and the upper end and the lower end of the condensing pipe 72 are closed. The heat exchange layer 73 is formed between the two support rings 715, the inner wall of the vertical tank 71 and the outer wall of the condensing pipe 72, so the support ring 715 is also used to separate the heat exchange layer 73 and the inner space of the condensing pipe 72.

[0094] Referring to Figure 8 Specifically, the support ring 715 serves as a mounting base and positioning component of the condensing pipe 72, and fixes the condensing pipe 72 on the central axis of the vertical tank 71. At the same time, the upper support ring 715 and the lower support ring 715 respectively define the upper boundary and the lower boundary of the heat exchange layer 73 in the vertical direction, which makes the two support rings 715, the outer wall of the condensing pipe 72 and the inner wall of the vertical tank 71 form a sealing structure together, ensuring that all high-temperature waste gas entering the hot gas inlet pipe 713 must flow through the labyrinth flow channel composed of a plurality of partition discs 721 from top to bottom, and cannot bypass and leak from the top or the bottom, thereby ensuring the heat exchange and purification effect.

[0095] In the embodiment, a rotary support bearing is arranged between the condensing pipe 72 and the support ring 715, and the condensing pipe 72 and the support ring 715 are connected with the corresponding rotary support bearing.

[0096] Referring to ​The working port 716 is provided on the outer side of the vertical tank 71 and communicates with the heat exchange layer 73. The closing door 717 is detachably or rotatably connected to the vertical tank 71, and is inserted into and sealed with the working port 716.

[0097] The working port 716 and the closing door 717 provide a maintenance and viewing window for the gas heat exchange mechanism 7. The working port 716 can also be used to insert a tool to clean the condensate deposited on the bottom of the vertical tank 71, thereby prolonging the maintenance time of the equipment.

[0098] The principle of the embodiment of the present application is as follows: when the graphitization furnace is working, the high-temperature exhaust gas from the cooling zone 13 in the furnace body 1 is drawn into the heat exchange layer 73 of the gas heat exchange mechanism 7. The high-temperature exhaust gas flows in a serpentine manner from top to bottom under the forced flow of the several separation discs 721 in the heat exchange layer 73. At the same time, the low-temperature clean gas from the blowing power assembly 52 and the blowing power assembly 62 is input into the condensing pipe 72 of the gas heat exchange mechanism 7 and flows from bottom to top. In this process, the low-temperature clean gas in the condensing pipe 72 exchanges heat with the high-temperature exhaust gas outside the condensing pipe 72, so that the low-temperature clean gas is preheated, the high-temperature exhaust gas is cooled and purified, and the preheated low-temperature clean gas is sent into the furnace body 1, and the cooled and purified high-temperature exhaust gas is drawn into the exhaust power assembly 42.

[0099] In this design, first, the high-temperature exhaust gas is cooled and purified before entering the exhaust power assembly 42, which protects the exhaust power assembly 42; second, the low-temperature clean gas entering the furnace body 1 is preheated, which avoids the thermal shock damage of the low-temperature clean gas to the heat preservation layer 2 and the graphite electrode 3, and improves the process stability; third, the waste heat of the high-temperature exhaust gas is recycled, which improves the overall energy efficiency of the equipment.

[0100] The embodiments of the present application are preferred embodiments of the present application, and are not intended to limit the protection scope of the present application. The same reference numerals are used to represent the same parts in the embodiments. Therefore, any equivalent changes made according to the structure, shape and principle of the present application should be included in the protection scope of the present application.

Claims

1. A high-temperature graphitization furnace for preventing corrosion of the insulation layer, characterized in that, include: The furnace body (1) has an insulation layer (2) and several graphite electrodes (3) on its inner wall. The furnace body (1) includes a low temperature zone (11), a high temperature zone (12) and a cooling zone (13) along its length. Vacuum pumping mechanism (4), which is connected to the furnace body (1) and is located in the cooling zone (13). The air intake mechanism (5) is connected to the furnace body (1) and is located in the low temperature zone (11). The vacuum pumping mechanism (4) is used to extract gas from the furnace body (1), and the pushing air intake mechanism (5) is used to deliver gas into the furnace body (1). The vacuum pumping mechanism (4) and the pushing air intake mechanism (5) work together to form an airflow that flows directionally from the low temperature zone (11) to the cooling zone (13) in the high temperature zone (12).

2. The high-temperature graphitization furnace for preventing corrosion of the insulation layer according to claim 1, characterized in that, It also includes several air intake blowing mechanisms (6), which are connected to the furnace body (1). The air intake blowing mechanisms (6) are arranged one-to-one with the graphite electrodes (3). The air intake blowing mechanisms (6) are used to blow air towards the end of the graphite electrode (3) located in the furnace body (1).

3. A high-temperature graphitization furnace for preventing corrosion of the insulation layer according to claim 2, characterized in that, The air intake blowing mechanism (6) includes a blowing sleeve (61) and a blowing power assembly (62). The blowing power assembly (62) is connected to the blowing sleeve (61) and is used to deliver gas to the corresponding blowing sleeve (61). A blowing hole (63) is provided through the side wall of the furnace body (1). The blowing sleeve (61) is sleeved on the outside of the graphite electrode (3) and the blowing sleeve (61) is inserted into the blowing hole (63). The inner side wall of the blowing sleeve (61) is spaced apart from the outer side wall of the graphite electrode (3). One end of the blowing sleeve (61) located outside the furnace body (1) is connected to the graphite electrode (3).

4. A high-temperature graphitization furnace for preventing corrosion of the insulation layer according to claim 1, characterized in that, The vacuum pumping mechanism (4) includes a pumping pipe (41) and a pumping power assembly (42). One end of the pumping pipe (41) is connected to the furnace body (1), and the other end is connected to the pumping power assembly (42). The pumping power assembly (42) is used to extract gas from the furnace body (1).

5. A high-temperature graphitization furnace for preventing corrosion of the insulation layer according to claim 4, characterized in that, A water-cooling assembly (45) is provided on the extraction pipe (41), which is used to cool the gas passing through the extraction pipe (41).

6. A high-temperature graphitization furnace for preventing corrosion of the insulation layer according to claim 4, characterized in that, The air extraction power assembly (42) includes a first pump group (422) and a second pump group (423), both of which are connected to the air extraction pipe (41).

7. A high-temperature graphitization furnace for preventing corrosion of the insulation layer according to claim 6, characterized in that, The air extraction power assembly (42) also includes a connecting pipe (421), one end of which is connected to the air extraction pipe (41), and the other end is connected to the first pump group (422) and the second pump group (423). A butterfly valve (424) and a filter (426) are provided on the connecting pipe (421). The butterfly valve (424) is located between the air extraction pipe (41) and the filter (426) along the length of the connecting pipe (421).

8. A high-temperature graphitization furnace for preventing corrosion of the insulation layer according to claim 4, characterized in that, The vacuum pumping mechanism (4) also includes an exhaust plug (46), and an exhaust outlet (44) is provided through the insulation layer (2). The exhaust outlet (44) is connected to the pumping pipe (41), and the exhaust plug (46) is inserted into the exhaust outlet (44). A meandering air passage (47) is provided through the gas outlet plug (46). The axis of the meandering air passage (47) is not straight. The meandering air passage (47) is used to introduce the gas in the furnace body (1) into the exhaust pipe (41).

9. A high-temperature graphitization furnace for preventing corrosion of the insulation layer according to claim 4, characterized in that, The air-inlet mechanism (5) includes an air-blowing pipe (51) and an air-blowing power assembly (52). One end of the air-blowing pipe (51) is connected to the furnace body (1), and the other end is connected to the air-blowing power assembly (52). The air-blowing power assembly (52) is used to deliver gas into the furnace body (1).

10. A high-temperature graphitization furnace for preventing corrosion of the insulation layer according to claim 9, characterized in that, It also includes a gas heat exchange mechanism (7), wherein the extraction pipe (41), the gas heat exchange mechanism (7) and the extraction power assembly (42) are connected in sequence, and the blowing pipe (51), the gas heat exchange mechanism (7) and the blowing power assembly (52) are connected in sequence. The gas heat exchange mechanism (7) is used to exchange heat between the gas extracted from the furnace body (1) by the extraction power assembly (42) and the gas input into the furnace body (1) by the blowing power assembly (52).

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