A mobile closed enclosure silicon carbide smelting furnace with wall gas collection

Abstract

The utility model discloses a movable closed cover silicon carbide smelting furnace of furnace wall gas collection, including end wall, side wall, hearth and movable closed cover, and the end wall is inlayed with electrode. End wall, side wall and hearth are mutually connected as a full closed type's open upper mouth's groove type furnace body, the groove type furnace body is filled with furnace burden, and the movable closed cover is arranged above the groove type furnace body and furnace burden, and the tail gas pipeline is arranged on the side wall or end wall and is communicated with the furnace, and the tail gas pipeline is communicated with the main pipe of the tail gas outside the furnace. A ring of mutually connected annular closed zone and movable closed cover closed connection are arranged along the length direction of the top of side wall and the length direction of the top of end wall or the length direction of the waist of the outside of end wall. The utility model discloses a full closed silicon carbide smelting furnace, collects valuable tail gas containing carbon monoxide, solves the problem of non-standard smelting tail gas emission in the silicon carbide industry, and uses the collected tail gas for gas power generation, coal chemical industry and comprehensive utilization.

Description

Technical Field

[0001] This utility model relates to the field of silicon carbide production technology, specifically to a mobile sealed hood silicon carbide smelting furnace with furnace wall gas collection. Background Technology

[0002] A traditional silicon carbide smelting furnace resembles a rectangular trough. It consists of two fixed end walls, each inlaid with positive and negative electrodes, and two sets of removable, permeable side walls. The bottom of the enclosure is a furnace bed constructed of refractory bricks. Two sets of graphite electrodes penetrate the end walls and extend into the furnace bed. A dedicated graphite powder core is distributed between the electrodes, providing a conductive path that generates significant heat when energized. The furnace core is surrounded by a mixture of silicon-based raw materials, petroleum coke, and anthracite, with insulation material surrounding the mixture. During silicon carbide smelting, the electric resistance furnace is powered, causing the furnace core temperature to rise. Once a certain high temperature is reached, heat is transferred through the furnace core surface to the surrounding mixture, causing a reaction that produces silicon carbide. Exhaust gases containing carbon monoxide, hydrogen, and other components are released and burned on the furnace surface. The existing silicon carbide smelting process adopts an environmentally friendly model of "furnace surface ignition of exhaust gas – high-temperature flue gas collection hood – dust removal and desulfurization by flue gas purification system – organized external emission." This model is a semi-closed smelting method with many leakage points in the collection hood. According to the air pollutant emission standards for the silicon carbide industry, the actual oxygen content in the flue gas is very high, making it difficult to meet the baseline oxygen content emission standards. Therefore, the drawbacks of traditional silicon carbide smelting furnaces are that they are not environmentally friendly and have high energy consumption.

[0003] On May 26, 2025, the inventor disclosed a "Silicon Carbide Smelting Furnace with a Mobile Enclosed Hood for Recovering Tail Gas" in Chinese Patent Application No. 2025210437795. The invention is characterized by: "1. The device includes an end wall, side walls, a furnace bed, and a mobile enclosed hood; 2. The shell surface of the mobile enclosed hood is provided with multiple air intake pipes communicating with the inside of the furnace. The air intake pipes are connected to the main tail gas pipe arranged on the hood frame, leading the tail gas from inside the furnace to the main tail gas pipe outside the furnace. The main tail gas pipe is connected to the main tail gas pipe outside the furnace, a fan, and tail gas after-treatment facilities via a valve group." However, this patent has the following shortcomings: the air intake pipes and the main tail gas pipe are arranged on the mobile enclosed hood. Each time the mobile enclosed hood is moved between furnace bodies, its main tail gas pipe and the main tail gas pipe outside the furnace must be disconnected and reconnected, causing inconvenience in production operations. Utility Model Content

[0004] The purpose of this invention is to provide a mobile sealed hood silicon carbide smelting furnace with furnace wall gas collection. By fully sealing the silicon carbide smelting furnace, valuable exhaust gases containing carbon monoxide are collected, which not only solves the problem of non-compliance of smelting exhaust gas emissions in the silicon carbide industry, but also allows the collected exhaust gas to be used for comprehensive utilization such as gas-fired power generation and downstream coal chemical industry.

[0005] To solve the above-mentioned technical problems, this utility model provides the following technical solution: a movable sealed hood silicon carbide smelting furnace with furnace wall gas collection, comprising end walls, side walls, a furnace bed, and a movable sealed hood. Electrodes are embedded in the end walls, and the end walls with embedded electrodes are connected to the fixed side walls and the furnace bed to form a fully sealed, top-opening trough-shaped furnace body. The trough-shaped furnace body is filled with furnace charge. The movable sealed hood is integrally installed above the trough-shaped furnace body and the furnace charge. The movable sealed hood is integrally fitted with an airtight shell. Multiple gas inlet pipes are distributed along the length of the side walls and communicate with the furnace interior. The gas inlet pipes are also connected to the main exhaust gas pipe outside the furnace; or, main exhaust gas pipes are installed at both ends of the end walls and communicate with the furnace interior. The exhaust gas inside the furnace is led out to the main exhaust gas pipe outside the furnace. A ring-shaped sealed belt is installed along the length of the top of the side wall and the top of the end wall or the outer waist of the end wall. The four sides of the shell of the movable sealed hood are sealed and connected to the curtain that can extend to the ring-shaped sealed belt. When the furnace body is sealed, the curtain and the ring-shaped sealed belt are sealed and connected around the furnace body. In this way, the movable sealed hood and the trough-shaped furnace body are sealed and connected around the furnace body to form a fully sealed silicon carbide smelting furnace for recovering tail gas. The tail gas main pipe on the side wall or end wall is connected to the external tail gas main pipe, fan and tail gas after-treatment facilities through valve group. Tracks are set along the length of the two side walls respectively. The movable sealed hood moves along the track from one furnace body that has been smelted or cooled to another furnace body to be smelted to collect tail gas alternately.

[0006] As a preferred embodiment of the movable sealed hood silicon carbide smelting furnace with furnace wall gas collection described in this utility model, the movable sealed hood body consists of a frame, a shell, a curtain, a traveling mechanism, a driving device, an internal spray cooling system, and a locking device; the frame supports the entire movable sealed hood, the shell is fixed on the frame and is completely sealed over the trough-shaped furnace body and the top surface of the furnace charge, one side of the curtain is sealed to the four sides of the shell, and the other side extends to the annular sealing band around the trough-shaped furnace body, and connects with the annular sealing band. The sealed belt is tightly connected; when the movable sealed hood moves, the curtain and the annular sealed belt detach; the traveling mechanism is connected to the hood frame to support the hood frame and allow the movable sealed hood to travel on the track surfaces on the two side walls of the trough furnace body; the spray cooling system inside the hood is arranged at the bottom of the hood shell and connected to an external water supply device to cool the furnace charge after smelting by spraying into the furnace; the locking device is used to reliably connect the movable sealed hood to the furnace body during smelting or cooling to prevent the movable sealed hood from separating from the furnace body due to positive pressure inside the furnace or other external forces.

[0007] As a preferred embodiment of the movable sealed hood silicon carbide smelting furnace with furnace wall gas collection described in this utility model, the movable sealed hood has a dust-proof function. A dust-proof curtain is arranged parallel to the inner side of the hood curtain on the side wall, with the ventilation holes of the side wall located between the hood curtain and the dust-proof curtain. The upper edge of the dust-proof curtain is connected to the hood shell, and the lower edge is connected to the top surface of the side wall via a pressing device. Both ends of the dust-proof curtain are connected to the hood curtain in the end wall area. The dust-proof curtain has a breathable filtration function, allowing the exhaust gas escaping from the furnace surface to enter the gas collection layer of the side wall through the dust-proof curtain and ventilation holes, while preventing dust in the exhaust gas escaping from the furnace surface from entering the gas collection layer. To increase the filtration area of ​​the dust-proof curtain, it can be configured as a curtain-like pleated shape.

[0008] As a preferred embodiment of the movable sealed hood silicon carbide smelting furnace with furnace wall gas collection described in this utility model, the end wall is composed of an end wall body, electrodes, and an annular sealing strip; the end wall body isolates the furnace interior and exterior spaces of the trough-shaped furnace body, the two ends of the end wall body are sealed and connected to the side walls, the bottom of the end wall body is sealed and connected to the hearth, the top surface of the end wall is set into a double slope or isosceles trapezoidal shape according to the angle of repose of the furnace charge, positive and negative electrodes are respectively sealed and embedded in the two end walls, the annular sealing strip is set along the length direction of the top of the end wall body or the outer waist of the end wall body, and is sealed and connected to the end wall body, the two ends of the annular sealing strip on the two end walls are respectively closed-loop connected to the two ends of the annular sealing strip on the two side walls, and the annular sealing strip is used to seal and connect with the curtain of the movable sealed hood to isolate the furnace interior and exterior spaces.

[0009] As a preferred embodiment of the movable sealed hood silicon carbide smelting furnace with furnace wall gas collection described in this utility model, the sidewall is composed of a sidewall body, a permeable layer, a gas collecting layer, an annular sealed belt, a track, vent holes, a vent cap, a gas inlet pipe, and a tail gas main pipe. The two ends of the sidewall are sealed to the end walls, and the bottom of the sidewall is sealed to the furnace bed. The annular sealed belt is set along the length of the top of the sidewall and is sealed to the sidewall body. The two ends of the annular sealed belt on the two sidewalls are respectively connected to the two ends of the annular sealed belt on the two end walls in a closed loop. The annular sealed belt is used to seal with the curtain of the movable sealed hood, isolating the space inside and outside the furnace. The track is set along the length of the top of the sidewall, supporting the movable sealed hood and allowing it to move between furnace bodies. The track between furnace bodies is connected by a track beam. The sidewall isolates the space inside and outside the furnace, and the permeable layer allows gas to escape from the side or bottom area of ​​the furnace body. The exhaust gas enters the gas collection layer, preventing dust in the exhaust gas from entering the gas collection layer. The gas collection layer is used to collect the exhaust gas escaping from the furnace. A certain number of vents are set along the length of the side wall of the gas collection layer, leading to the internal space of the furnace surface, so that the exhaust gas escaping from the furnace surface can enter the gas collection layer through the vents. Vent caps are set at the vent openings to prevent furnace charge from entering the vents. The exhaust gas main pipe and multiple air intake pipes are set along the length of the outer side wall. One end of the air intake pipe is connected to the exhaust gas main pipe, and the other end is connected to the gas collection layer. The exhaust gas escaping from the furnace is collected in the gas collection layer and then connected through the air intake pipe, the exhaust gas main pipe, the valve group, the external exhaust gas main pipe, the fan, and the exhaust gas after-treatment facilities.

[0010] As a preferred embodiment of the movable sealed hood silicon carbide smelting furnace with furnace wall gas collection described in this utility model, the furnace bed has a permeable function to increase its permeability. The furnace bed is composed of a furnace base layer and a furnace lining permeable layer from bottom to top. The furnace base layer isolates the furnace bottom from the furnace outside space. The furnace lining permeable layer is used to guide the exhaust gas escaping from the furnace bed area to the permeable layers of the side walls on both sides, and guides it to the gas collection layer of the side walls through the side wall permeable layers. A furnace bed water collection well is set at the bottom of the furnace lining permeable layer to collect excess cooling water during spray cooling. A water pump is placed in the water collection well, and the cooling water is discharged outside the furnace through a drainage pipe. A movable cover plate with grate holes is set at the opening of the water collection well, and a filter cloth is covered on the movable cover plate to prevent powder from being carried into the water collection well.

[0011] As a preferred embodiment of the movable sealed hood silicon carbide smelting furnace with furnace wall gas collection described in this utility model, the annular sealing belt is configured as a horizontally interconnected annular water seal groove along the circumference of the furnace body, located at the top of the side wall and the outer waist area of ​​the end wall. The water seal groove is filled with water, and the curtain of the movable sealed hood extends into the water in the water seal groove, thus forming a water seal on the movable sealed hood. A curtain fixing device is provided for the curtain to prevent it from detaching from the water seal groove due to positive pressure, negative pressure, or other external forces within the furnace. When the movable sealed hood moves, the curtain fixing device and the curtain are removed from the water seal groove. To facilitate the upward folding and removal of the curtain from the water seal groove, especially in the end wall area and at the four corners of the furnace body, the curtain is designed with a curtain-like pleated shape.

[0012] As a preferred embodiment of the movable sealed hood silicon carbide smelting furnace with furnace wall gas collection described in this utility model, the annular sealing belt is provided with interconnected concave arc-shaped sealing grooves at the top of the side walls and the top or waist area of ​​the end walls, running around the furnace body. The curtain of the movable sealed hood extends to the inner wall of the concave arc-shaped sealing groove. A water hose is placed in the concave arc-shaped sealing groove and presses the curtain tightly against the inner wall of the groove, thereby forming a seal between the water hose and the movable sealed hood. A clamping device is provided for the water hose to prevent the curtain from detaching from the concave arc-shaped sealing groove due to positive pressure, negative pressure or other external forces inside the furnace. When the movable sealed hood moves, the clamping device is released, the water in the water hose is released, and the curtain is moved out of the concave arc-shaped sealing groove.

[0013] As a preferred embodiment of the movable sealed hood silicon carbide smelting furnace with furnace wall gas collection described in this utility model, the tail gas main pipe is located in the area near the side wall at both ends of the end wall, extending the gas collection layer of the side wall to the area at both ends of the end wall. The tail gas main pipe and the gas collection layer extending to the area at both ends of the end wall are connected. The tail gas in the furnace is discharged from the tail gas main pipe at both ends of the end wall through the gas collection layer and is connected to the tail gas pipeline system outside the furnace.

[0014] As a preferred embodiment of the movable sealed hood silicon carbide smelting furnace with furnace wall gas collection described in this utility model, the side wall area can be opened with a furnace door according to process requirements to facilitate the entry and exit of the furnace discharge equipment. The furnace door is part of the side wall and has the function of the side wall. When the furnace discharge is completed and the furnace loading process begins, the furnace door is sealed to the side wall. The annular sealing strip at the top of the furnace door is sealed to the annular sealing strip at the top of the side wall. The track at the top of the furnace door is connected to the track at the top of the side wall.

[0015] As a preferred embodiment of the mobile sealed hood silicon carbide smelting furnace with furnace wall gas collection described in this utility model, the silicon carbide production process includes: charging, nitrogen purging, smelting, cooling, and unloading. The charging and unloading processes are carried out outside the mobile sealed hood; the nitrogen purging, smelting, and cooling processes are carried out inside the mobile sealed hood. The nitrogen purging process completely replaces all the air in the sealed furnace system after charging with nitrogen. Only after the nitrogen purging is completed can the smelting process be initiated. Depending on the different requirements of the production process, the cooling process after smelting and the insulation material unloading process are carried out simultaneously. The mobile sealed hood can synchronously cooperate with the furnace body to operate alternately in sealed and open states.

[0016] Compared with the prior art, the advantages of this utility model are: Based on the traditional silicon carbide smelting furnace, the two sets of detachable permeable sidewalls are improved into sealed fixed sidewalls. The end walls, fixed sidewalls, and hearth are connected to form a fully enclosed, open-top trough-shaped furnace body. The trough-shaped furnace body can be built above ground, semi-underground, or fully underground. The trough-shaped furnace body is filled with furnace charge. A movable sealed hood is installed above the trough-shaped furnace body and the furnace charge. The movable sealed hood is connected to the trough-shaped furnace body through a curtain, forming a fully enclosed silicon carbide smelting furnace for recovering tail gas. The tail gas generated in the silicon carbide furnace smelting process is transported to the tail gas after-treatment facility through the tail gas main pipe on the side wall or end wall, the external valve group, the tail gas main pipe, and the fan. The spray cooling system installed inside the mobile sealed hood cools the furnace charge after smelting by spraying it into the furnace, and can also collect the exhaust gas generated during the cooling process of the silicon carbide furnace. Tracks are set along the length of the top of the two side walls, and the mobile sealed hood moves along the tracks from one furnace body that has been smelted or cooled to another furnace body to be smelted, alternately collecting exhaust gas.

[0017] The essence of this invention lies in its "combination of hard and soft technologies, and dual-purpose design." The "hard" aspect is embodied in the furnace body and the outer casing, while the "soft" aspect is embodied in the water and the curtain. This combination of "soft" technologies achieves a seamless seal between the "hard" and "soft" components, ensuring airtight gas collection. The "dual-purpose design" collects exhaust gases from both the silicon carbide smelting and cooling processes. Depending on the properties of the collected exhaust gases, they can be treated together or separately in subsequent processes. This invention features a simple and practical structure, and the furnace body is reliably sealed.

[0018] This invention solves the environmental management problem of the most polluting smelting and cooling processes in the silicon carbide production process, including the charging, smelting, cooling, and unloading processes. At the same time, the collected exhaust gas can be used for comprehensive utilization such as gas-fired power generation and coal chemical downstream processes. Attached Figure Description

[0019] To more clearly illustrate the technical solutions of the embodiments of this utility model, the present utility model will be described in detail below with reference to the accompanying drawings and detailed embodiments. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. Among them: Figure 1 This is a schematic diagram of the BB cross section perpendicular to the side wall of this utility model; showing a sealing type of the movable sealed cover and the annular sealed strip of the side wall. The movable sealed cover is equipped with a dust curtain, a water collection well is arranged at the bottom of the furnace bed, and the gas duct and exhaust gas main are connected to the furnace body in the side wall area.

[0020] Figure 2 This is a schematic diagram of the BB cross section perpendicular to the side wall of this utility model; it shows a sealing type of the movable sealed cover and the annular sealed band of the side wall. The movable sealed cover does not have a dust curtain, and the bottom of the furnace bed does not have a water accumulation well. The gas inlet pipe and the exhaust gas main pipe are connected to the furnace body in the side wall area.

[0021] Figure 3 This is a schematic diagram of the AA section perpendicular to the end wall of this utility model; it shows a sealing type of the movable sealing hood and the annular sealing strip of the end wall, with the exhaust gas main pipe connected to the furnace body in the end wall area.

[0022] Figure 4 This is a frontal view of the end wall of this utility model from direction A; showing a sealing type of the curtain of the movable sealed enclosure and the annular sealing strip of the end wall.

[0023] Figure 5 This is a frontal view of the side wall of this utility model from direction B; showing a sealing type of the curtain of the movable sealed enclosure and the annular sealing strip of the side wall.

[0024] Figure 6 For the Figure 2 The structural diagram at point A shows a combination type of sidewall.

[0025] In the diagram: 1. Trough-shaped furnace body; 2. Side wall; 3. End wall; 4. Hearth; 5. Movable sealed hood; 6. Furnace charge; 7. Main exhaust pipe; 20. Track beam; 21. Side wall; 22. Permeable layer; 221. Filter cloth; 23. Gas collecting layer; 24. Annular sealed belt; 25. Track; 26. Vent hole; 27. Vent cap; 28. Exhaust pipe; 29. ​​Main exhaust pipe; 31. End wall; 32. Electrode; 41. Furnace base layer; 42. Permeable layer of furnace lining; 43. Hearth water collection well; 44. Fireproof filter cloth; 51. Cover frame; 52. Cover shell; 53. Cover curtain; 54. Dustproof curtain; 55. Cover locking device; 56. Internal spray cooling system; 57. Traveling mechanism; 58. Curtain fixing device. Detailed Implementation

[0026] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, the specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings.

[0027] Many specific details are set forth in the following description in order to provide a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Those skilled in the art can make similar extensions without departing from the spirit of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0028] Secondly, this utility model is described in detail with reference to the schematic diagrams. When describing the embodiments of this utility model, for ease of explanation, the cross-sectional views and front views illustrating the device structure may be partially enlarged, not according to general proportions. Furthermore, the schematic diagrams are merely examples and should not limit the scope of protection of this utility model. In addition, actual manufacturing should include the three-dimensional spatial dimensions of length, width, and depth.

[0029] To make the objectives, technical solutions, and advantages of this utility model clearer, the embodiments of this utility model will be described in further detail below with reference to the accompanying drawings.

[0030] This invention provides a mobile sealed hood silicon carbide smelting furnace with furnace wall gas collection. Based on the traditional silicon carbide smelting furnace, the two sets of detachable permeable sidewalls are improved into sealed fixed sidewalls. The end walls, fixed sidewalls, and furnace bed are interconnected to form a fully sealed, open-top trough-shaped furnace body. The trough-shaped furnace body can be constructed above ground, semi-underground, or fully underground. The trough-shaped furnace body is filled with furnace charge. A mobile sealed hood is installed above the trough-shaped furnace body and the furnace charge. The mobile sealed hood is connected to the trough-shaped furnace body by a curtain, forming a fully sealed silicon carbide smelting furnace for recovering tail gas. The tail gas generated during the silicon carbide furnace smelting process is transported to the tail gas post-treatment facility through the tail gas main pipe on the side wall or end wall, the external valve group, the tail gas main pipe, and the fan. The spray cooling system installed inside the mobile sealed hood cools the furnace charge after smelting by spraying it into the furnace, and can also collect the exhaust gas generated during the cooling process of the silicon carbide furnace. Tracks are set along the length of the top of the two side walls, and the mobile sealed hood moves along the tracks from one furnace body that has been smelted or cooled to another furnace body to be smelted, alternately collecting exhaust gas.

[0031] Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 The diagram shown is an overall structural schematic of an embodiment of a movable sealed hood silicon carbide smelting furnace with furnace wall gas collection according to this utility model. Please refer to [link / reference]. Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 The specific implementation principle is as follows; Please refer to Figure 1 , Figure 1This is a sealed type of semi-underground trough furnace body 1 and movable sealed hood 5. The cross-sectional schematic diagram shows that, based on the traditional fixed silicon carbide smelting furnace, the two sets of detachable and breathable side walls are improved into sealed fixed side walls 2. The two fixed end walls 3, which are respectively embedded with positive and negative electrodes 32, the two sets of fixed side walls 2, and the furnace bed 4 are connected to form a fully sealed trough furnace body 1 with an open top. The trough furnace body 1 is covered with an airtight insulating material. The length and height of the end walls 3 and side walls 2 of the trough furnace body 1 are determined according to the process parameters of the silicon carbide sealed furnace and the amount of charge during the whole cycle of smelting. After the trough furnace body 1 is filled with various furnace materials 6 according to the silicon carbide smelting process requirements, a movable sealed hood 5 is set above the trough furnace body 1 and the furnace materials 6. The movable sealed hood 5 moves along the track 25 from one trough furnace body 1 that has been smelted or cooled to another trough furnace body 1 to be smelted, and is used alternately. The main body of the mobile sealed enclosure 5 consists of an enclosure frame 51, an enclosure shell 52, an enclosure curtain 53, a dustproof curtain 54, an enclosure locking device 55, an internal spray cooling system 56, a walking mechanism 57, and a curtain fixing device 58. The frame 51 is used to support the overall movable sealed hood 5 to meet the structural and thermal stress stability requirements of the movable sealed hood 5 during the moving and gas collection processes. The frame 51 is made of steel. The shell 52 is fixed on the frame 51 and is completely sealed and covers the top surface of the trough furnace body 1 and the furnace charge 6. The shell 52 can be made of stainless steel sheet. In order to reduce the cavity volume inside the hood, the shell 52 is designed as an isosceles trapezoidal cross section according to the top surface contour of the furnace charge 6 or the end wall 3. The upper edge of the curtain 53 is sealed to the four sides of the shell 52, and the lower edge extends to the annular sealing strip 24 around the trough furnace body 1. The curtain 53 can be made of an airtight film. When the movable sealed hood 5 moves, the curtain 53 and the annular sealing strip 24 are separated. Along the inner side of the cover curtain 53 in the side wall 2 area, a dust-proof curtain 54 is arranged parallel to the cover curtain 53. The ventilation hole 26 of the side wall 2 is located between the cover curtain 53 and the dust-proof curtain 54. The upper side of the dust-proof curtain 54 is connected to the cover shell 52, and the lower side is connected to the top surface of the side wall 2 through a pressing device. The two ends of the dust-proof curtain 54 are connected to the cover curtain 53 in the end wall 3 area. The dust-proof curtain 54 has the function of filtering dust, so that the exhaust gas escaping from the furnace surface enters the gas collection layer 23 of the side wall 2 through the dust-proof curtain 54 and the ventilation hole 26, while preventing the dust in the exhaust gas escaping from the furnace surface from entering the gas collection layer 23. The dust-proof curtain 54 is made of anti-static and anti-condensation filter cloth. In order to increase the filtration area of ​​the dust-proof curtain (54), the dust-proof curtain (54) can be set as a curtain-style pleated shape.The traveling mechanism 57 is connected to the cover frame 51, supporting the cover frame 51 and allowing the movable sealed cover 5 to travel on the track 25 surface on the two side walls 2 of the trough furnace body 1. The traveling mechanism 57 has its own drive device. The spray cooling system 56 inside the cover is arranged at the bottom of the cover 52 and is connected to an external water supply device. It cools the furnace charge after smelting by spraying into the furnace. The movable sealed cover 5 collects the exhaust gas generated by the cooling of the furnace charge. The locking device 55 is used to reliably connect the movable sealed cover 5 to the furnace body during smelting or cooling to prevent the movable sealed cover 5 from separating from the furnace body due to positive pressure inside the furnace or other external forces. The side wall 2 consists of the side wall 21, the air permeable layer 22, the gas collecting layer 23, the annular sealing belt 24, the track 25, the vent 26, the vent cap 27, the gas duct 28, and the exhaust gas main duct 29. The side wall 2 is sealed at both ends to the end wall 3, and sealed at the bottom to the furnace bed 4. An annular sealing strip 24 is set along the length of the top of the side wall 2 and is sealed to the side wall 21. The two ends of the annular sealing strip 24 on the two side walls 2 are respectively connected in a closed loop to the two ends of the annular sealing strip 24 on the two end walls 3. The annular sealing strip 24 is used to seal with the curtain 53 of the movable sealing hood 5, isolating the space inside and outside the furnace. The annular sealing strip 24 uses a water seal groove sealing method, and the lower edge of the curtain 53 extends into the water seal groove. The track 25 is set along the length of the top of the side wall 2, supporting the movable sealing hood 5 and allowing the movable sealing hood 5 to move between furnace bodies. The side wall 21 isolates the space inside and outside the furnace. The permeable layer 22 allows the exhaust gas escaping from the side or bottom area of ​​the furnace to enter the gas collection layer 23 and prevents dust in the exhaust gas from entering the gas collection layer 23. The gas collection layer 23 is used to collect the exhaust gas escaping from the furnace. A certain number of ventilation holes 26 are provided along the length of the side wall 2 to lead to the internal space of the furnace surface, so that the exhaust gas escaping from the furnace surface can enter the gas collection layer 23 through the ventilation holes 26. Ventilation caps 27 are provided at the openings of the ventilation holes 26 to prevent furnace charge from entering the ventilation holes 26. The exhaust gas main pipe 29 and multiple air intake pipes 28 are provided along the length of the outer side of the side wall 21. One end of the air intake pipe 28 is connected to the exhaust gas main pipe 29, and the other end is connected to the gas collection layer 23. The exhaust gas escaping from the furnace is collected in the gas collection layer 23 and then connected through the air intake pipe 28, the exhaust gas main pipe 29, the valve group, the external exhaust gas main pipe 7, the fan, and the exhaust gas after-treatment facilities. The furnace bed 4 has a permeable function to increase its permeability. The furnace bed 4 is composed of a furnace base 41 and a furnace lining permeable layer 42 from bottom to top. The furnace base 41 isolates the furnace bottom from the external space. The furnace lining permeable layer 42 is used to guide the exhaust gas escaping from the furnace bed 4 area to the permeable layer 22 of the side walls 2 on both sides, and then guide it to the gas collection layer 23 of the side walls 2 through the permeable layer 22. A furnace bed water collection well 43 is set at the bottom of the furnace lining permeable layer 42 to collect excess cooling water during spray cooling. A water pump is placed in the furnace bed water collection well 43 to discharge the cooling water outside the furnace through a drainage pipe. A movable cover plate with grate holes is set at the opening of the furnace bed water collection well 43. The movable cover plate is covered with filter cloth 44 to prevent powder from being carried into the furnace bed water collection well 43.

[0032] Please refer to Figure 2 , Figure 2 In order to be in Figure 1 Based on this, the furnace bed water accumulation well 43 and dust curtain 54 were eliminated; the exhaust gas was purified outside the furnace; the walking mechanism 57 of the mobile sealed cover 5 did not have a drive device; when the mobile sealed cover 5 moved, it was dragged by a crane or other hood-dragging equipment.

[0033] Please refer to Figure 3 , Figure 3 This is a cross-sectional schematic diagram perpendicular to the end wall 3, showing a sealing configuration of the movable sealed hood 5 and the end wall 3. The end wall 3 consists of an end wall body 31, electrodes 32, and an annular sealing band 24. The end wall body 31 isolates the furnace interior and exterior spaces of the trough-shaped furnace body 1. The two ends of the end wall body 31 are sealed and connected to the side walls 2, and the bottom of the end wall body 31 is sealed and connected to the furnace bed 4. Positive and negative electrodes 32 are respectively sealed and embedded in the two end wall bodies 31. The annular sealing band 24 is set along the length of the outer waist of the end wall body 31, and the annular sealing band 24 adopts a water seal groove sealing method. The upper edge of the curtain 53 of the movable sealed hood 5 is sealed and connected to the edge of the shell 52. The lower edge of the curtain 53 extends into the water seal groove, isolating the furnace interior and exterior spaces. The water seal troughs at both ends and the water seal troughs on the side wall 2 are horizontally connected. To facilitate the removal of the curtain 53 from the water seal trough, especially in the end wall 3 area and the four corners of the furnace body 1, the curtain 53 is designed as a curtain-style pleated shape. The exhaust gas main pipe 29 is located in the area near the side wall 2 at both ends of the end wall 3, extending the gas collection layer 23 of the side wall 2 to the area at both ends of the end wall 3. The exhaust gas main pipe 29 and the gas collection layer 23 extending to the area at both ends of the end wall 3 are connected. The exhaust gas in the furnace is discharged from the furnace through the gas collection layer 23 from the exhaust gas main pipe 29 in the area at both ends of the end wall 3 and connected to the exhaust gas main pipe 7 outside the furnace.

[0034] Please refer to Figure 4 , Figure 4 This is a frontal view perpendicular to the end wall 3; showing a sealing configuration of the curtain 53 of the movable sealed hood 5 and the annular sealing band 24 of the end wall 3. The end wall 3 consists of an end wall body 31, electrodes 32, and an annular sealing band 24. The two ends of the end wall body 31 are sealed to the side walls 2, and the bottom of the end wall body 31 is sealed to the furnace bed 4. Positive and negative electrodes 32 are respectively sealed and embedded in the end wall 3. The annular sealing band 24 is set along the length of the outer waist of the end wall body 31, and the annular sealing band 24 adopts a water seal groove sealing method. The shell 52 of the movable sealed hood 5 is designed with an isosceles trapezoidal cross section along the top surface contour of the end wall 3. The upper side of the curtain 53 is also designed with an isosceles trapezoidal cross section and is sealed to the edge of the shell 52. The lower side of the curtain 53 extends into the water seal groove. The water seal grooves at both ends and the water seal grooves on the side wall 2 are horizontally connected. The curtain 53 is set in a curtain-like pleated shape. The air intake pipe 28 and the exhaust gas main pipe 29 are connected to the furnace body in the side wall area.

[0035] Please refer to Figure 5 , Figure 5 This is a frontal view perpendicular to the side wall 2, showing a sealing configuration of the movable sealed enclosure 5 and the side wall 2. The side wall 21 is sealed at both ends to the end wall 3, and sealed at the bottom to the furnace bed 4. An annular sealing strip 24 is provided along the length of the top of the side wall 21, and the annular sealing strip 24 uses a water seal groove sealing method. The exhaust pipe 28 and the exhaust gas main pipe 29 are arranged on the side wall 2 and connected to the external exhaust gas main pipe 7. The upper edge of the curtain 53 is sealed to the edge of the enclosure 52, and the lower edge of the curtain 53 extends into the water seal groove. The two ends of the water seal groove are horizontally connected to the water seal groove on the end wall 3. The curtain 53 is designed with a curtain-like pleated shape to facilitate flipping up from the water seal groove. The track 25 is set along the length of the top of the side wall. The traveling mechanism 57 of the movable sealed hood 5 travels on the track 25, so that the movable sealed hood 5 alternates between furnace bodies. The tracks 25 between furnace bodies are connected by track beams 20.

[0036] Please refer to Figure 6 , Figure 6 This is a combination type of sidewall 2. From the outside in, sidewall 2 consists of sidewall body 21, gas collecting layer 23, and permeable layer 22. Gas duct 28 is arranged on sidewall body 21, connecting to gas collecting layer 23. Permeable layer 22 is constructed with porous bricks. Due to the relatively large pore size within the porous bricks, dust from the exhaust gas can easily enter gas collecting layer 23 and gas duct 28. Therefore, filter cloth 221 is sandwiched between the two layers of porous bricks to isolate dust. During construction, the porous bricks are arranged horizontally to connect gas collecting layer 23 and the furnace interior. To transfer the pressure of the furnace material onto sidewall body 21, the porous bricks of permeable layer 22 extend horizontally and vertically, resting against the inner wall of sidewall body 21 within gas collecting layer 23, thus protecting the structural stability of permeable layer 22.

[0037] Although the present invention has been described above with reference to embodiments, various modifications can be made and components can be replaced with equivalents without departing from the scope of the present invention. In particular, as long as there is no structural conflict, the features in the embodiments disclosed in this invention can be combined with each other in any way. The lack of an exhaustive description of these combinations in this specification is merely for the sake of brevity and resource conservation. Therefore, the present invention is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

[0038] Without departing from the scope of this utility model, and in accordance with the requirements of relevant safety and usage specifications, regulations, and engineering standards for gas, the nitrogen protection, nitrogen replacement, valve group, control valve, explosion-proof valve, safety and detection instruments, water seal, steam trap, vent pipe, alarm device, online gas analysis, automatic control, power drive, waterproofing, insulation, expansion joint, main structure, construction methods, refractory materials, operating platform, guardrail, expansion joint, and other facilities configured in the implementation of this utility model are conventional configurations and do not have any structural conflict with this utility model. Therefore, the above configurations do not exceed the protection scope of this utility model.

Claims

1. A movable sealed hood silicon carbide smelting furnace with furnace wall gas collection, comprising side walls (2), end walls (3), a hearth (4), and a movable sealed hood (5), characterized in that, Electrodes (32) are embedded in the end wall (3). The end wall (3), the fixed side wall (2), and the furnace bed (4) are connected to each other to form a fully enclosed trough-shaped furnace body (1) with an open top. The trough-shaped furnace body (1) is filled with furnace charge (6). A movable sealed cover (5) is set above the trough-shaped furnace body (1) and the furnace charge (6). A tail gas main pipe (29) and multiple gas inlet pipes (28) are set along the length direction of the outer side wall (21). One end of the gas inlet pipe (28) is connected to the tail gas main pipe (29), and the other end is connected to the gas collection layer (23). The tail gas escaping from the furnace is collected in the gas collection layer (23) and then connected through multiple gas inlet pipes (28), tail gas main pipe (29), valve group, external tail gas main pipe (7), fan and tail gas after-treatment facilities. The movable sealed cover (5) is moved along the track (25) from one furnace body that has been smelted or cooled to another furnace body that is to be smelted and used alternately.

2. The movable sealed hood silicon carbide smelting furnace with furnace wall gas collection according to claim 1, characterized in that, The main body of the movable sealed hood (5) consists of a frame (51), a shell (52), a curtain (53), a locking device (55), an internal spray cooling system (56), and a walking mechanism (57); the frame (51) is used to support the overall movable sealed hood (5), the shell (52) is fixed on the frame (51), and is completely sealed and covers the top surface of the trough furnace body (1) and the furnace charge (6), one side of the curtain (53) is sealed to the four sides of the shell (52), and the other side extends to the annular sealing strip (24) around the trough furnace body (1) and is sealed to the annular sealing strip (24); the movable sealed hood ( 5) When moving, the curtain (53) and the annular sealing belt (24) are disengaged; the walking mechanism (57) and the cover frame (51) are connected to support the cover frame (51) and allow the movable sealed cover (5) to move on the track (25) surface on the two side walls (2) of the trough furnace body (1); the spray cooling system (56) inside the cover is arranged at the bottom of the cover shell (52) and connected to the external water supply device to cool the furnace charge after smelting by spraying into the furnace; the locking device (55) is used to reliably connect the movable sealed cover (5) to the furnace body during smelting or cooling to prevent the movable sealed cover (5) from separating from the furnace body due to positive pressure inside the furnace or other external forces.

3. A movable sealed hood silicon carbide smelting furnace with furnace wall gas collection according to claim 2, characterized in that, The movable sealed cover (5) has a dustproof curtain (54) arranged parallel to the cover curtain (53) on the inner side of the cover curtain (53) in the side wall (2) area, and the ventilation hole (26) of the side wall (2) is located between the cover curtain (53) and the dustproof curtain (54). The upper side of the dustproof curtain (54) is connected to the cover shell (52), and the lower side is connected to the top surface of the side wall (2) through a pressing device. The two ends of the dustproof curtain (54) are connected to the cover curtain (53) in the end wall (3) area. The dustproof curtain (54) has a breathable filtration function, so that the exhaust gas escaping from the furnace surface enters the gas collection layer (23) of the side wall (2) through the dustproof curtain (54) and the ventilation hole (26), while preventing the dust in the exhaust gas escaping from the furnace surface from entering the gas collection layer (23). In order to increase the filtration area of ​​the dustproof curtain (54), the dustproof curtain (54) is set in a curtain-like pleated shape.

4. A movable sealed hood silicon carbide smelting furnace with furnace wall gas collection according to claim 1, characterized in that, The end wall (3) consists of an end wall body (31), an electrode (32), and an annular sealed strip (24). The end wall body (31) isolates the furnace interior and exterior spaces of the trough-shaped furnace body (1). The two ends of the end wall body (31) are sealed and connected to the side walls (2). The bottom of the end wall body (31) is sealed and connected to the hearth (4). The top surface of the end wall (3) is set as a double slope or isosceles trapezoidal shape according to the angle of repose of the furnace charge (6). Positive and negative electrodes are respectively sealed and embedded in the two end wall bodies (31). The annular sealing strip (24) is set along the length of the top of the end wall (31) or the outer waist of the end wall (31) and is sealed to the end wall (31). The two ends of the annular sealing strip (24) on the two end walls (3) are respectively connected to the two ends of the annular sealing strip (24) on the two side walls (2). The annular sealing strip (24) is used to seal to the curtain (53) of the movable sealing cover (5) to isolate the space inside and outside the furnace.

5. A movable sealed hood silicon carbide smelting furnace with furnace wall gas collection according to claim 1, characterized in that, The side wall (2) consists of a side wall body (21), a permeable layer (22), a gas collecting layer (23), an annular sealing strip (24), a track (25), a vent (26), a vent cap (27), a gas inlet pipe (28), and a tail gas main pipe (29). The two ends of the side wall (2) are sealed to the end wall (3), and the bottom of the side wall (2) is sealed to the furnace bed (4). The annular sealing strip (24) is set along the length of the top of the side wall (2) and is sealed to the side wall body (21). The two ends of the annular sealing strip (24) on the two side walls (2) are respectively connected to the two ends of the annular sealing strip (24) on the two end walls (3). The annular sealing strip (24) is used to seal to the curtain (53) of the movable sealing hood (5) to isolate the space inside and outside the furnace. The track (25) is along the length of the side wall (21). The side wall (2) is set along the length of the top, and the track (25) supports the movable sealed cover (5) and allows the movable sealed cover (5) to move between the furnace bodies. The track between the furnace bodies is connected by the track beam (20). The side wall (21) isolates the space inside and outside the furnace. The permeable layer (22) allows the exhaust gas escaping from the side and bottom areas of the furnace body to enter the gas collection layer (23) and prevents the dust in the exhaust gas from entering the gas collection layer (23). The gas collection layer (23) is used to collect the exhaust gas escaping from the furnace. The gas collection layer (23) is set with a certain number of ventilation holes (26) along the length of the side wall (2) to the internal space of the furnace surface, so that the exhaust gas escaping from the furnace surface can enter the gas collection layer (23) through the ventilation holes (26). The ventilation holes (26) are equipped with ventilation caps (27) to prevent the furnace charge from entering the ventilation holes (26).

6. A movable sealed hood silicon carbide smelting furnace with furnace wall gas collection according to claim 1, characterized in that, The furnace bed (4) is composed of a furnace base layer (41) and a furnace lining permeable layer (42) from bottom to top to increase the permeability of the furnace bed (4). The furnace base layer (41) isolates the furnace bottom from the furnace space. The furnace lining permeable layer (42) is used to guide the exhaust gas escaping from the furnace bed (4) area to the permeable layer (22) of the side walls (2) on both sides, and guide it to the gas collection layer (23) of the side walls (2) through the permeable layer (22). A furnace bed water collection well (43) is set at the bottom of the furnace lining permeable layer (42) of the furnace bed (4) to collect excess cooling water during spray cooling. A water pump is placed in the furnace bed water collection well (43) to discharge the cooling water outside the furnace through the drainage pipe. A movable cover plate with grate holes is set at the opening of the furnace bed water collection well (43). A fireproof filter cloth (44) is covered on the movable cover plate to prevent powder from being brought into the furnace bed water collection well (43).

7. A movable sealed hood silicon carbide smelting furnace with furnace wall gas collection according to claim 4 or claim 5, characterized in that, The aforementioned annular sealed belt (24) has a horizontally connected water seal groove on the top of the side wall (2) and the outer waist area of ​​the end wall (3) that is connected around the furnace body. The water seal groove is filled with water, and the curtain (53) of the movable sealed cover (5) extends into the water in the water seal groove to form a water seal on the movable sealed cover (5). The curtain (53) is equipped with a curtain fixing device (58) to prevent the curtain (53) from falling out of the water seal groove due to positive pressure, negative pressure or other external forces in the furnace.

8. A movable sealed hood silicon carbide smelting furnace with furnace wall gas collection according to claim 4 or claim 5, characterized in that, The aforementioned annular sealing strip (24) is provided in the top of the side wall (2) and the top or waist area of ​​the end wall (3) as an interconnected concave arc-shaped sealing strip around the furnace body. The curtain (53) of the movable sealing cover (5) extends to the inner wall of the concave arc-shaped sealing strip. A water hose is placed in the concave arc-shaped sealing strip and the curtain (53) is pressed tightly against the inner wall of the concave arc-shaped sealing strip to form a seal of the movable sealing cover (5) by the water hose.

9. A movable sealed hood silicon carbide smelting furnace with furnace wall gas collection according to claim 1, characterized in that, The exhaust gas main pipe (29) is located in the area near the side wall (2) at both ends of the end wall (3), extending the gas collection layer (23) of the side wall (2) to the area at both ends of the end wall (3). The exhaust gas main pipe (29) and the gas collection layer (23) extending to the area at both ends of the end wall (3) are connected. The exhaust gas in the furnace is discharged from the exhaust gas main pipe (29) at both ends of the end wall (3) through the gas collection layer (23) and connected to the exhaust gas pipeline system outside the furnace.

10. A movable sealed hood silicon carbide smelting furnace with furnace wall gas collection according to claim 5, characterized in that, The side wall (2) area is provided with a furnace door according to the process requirements to facilitate the entry and exit of the furnace equipment. The furnace door is part of the side wall (2) and has the function of the side wall (2). When the furnace is completed and the furnace loading process is started, the furnace door is sealed to the side wall (2). The annular sealing strip (24) at the top of the furnace door is sealed to the annular sealing strip (24) at the top of the side wall (2). The track (25) at the top of the furnace door is connected to the track (25) at the top of the side wall (2).

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