Push plate furnace equipment for vanadium-nitrogen alloy production

Abstract

The invention discloses pushed slab furnace equipment for vanadium-nitrogen alloy production, which comprises a main kiln, the main kiln comprises a low-temperature section, a corrosion section, a high-temperature section and a cooling section which are connected in sequence, a track for conveying a crucible is arranged in the main kiln, no heating element is arranged in the corrosion section, and no heating element is arranged in the cooling section. A graphite heating assembly used for directly heating the high-temperature section and radiating heat to the corrosion section is arranged in the high-temperature section and comprises an upper graphite heating assembly located above the track and a lower graphite heating assembly located below the track. The pusher furnace equipment for vanadium-nitrogen alloy production has the advantages of being high in production efficiency, short in heating and cooling time and long in service life.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of heat treatment equipment, in particular to a push plate furnace equipment for vanadium-nitrogen alloy production. BACKGROUND

[0002] The vanadium-nitrogen alloy added in steel can improve the comprehensive mechanical properties of the steel such as strength, toughness, ductility and thermal fatigue resistance, and make the steel have good weldability. At the same time, the addition of vanadium-nitrogen alloy can save 30-40% of vanadium addition amount at the same strength, thereby reducing the cost.

[0003] At present, the preparation of vanadium-nitrogen alloy in China mainly uses push plate kiln, and its heating mode is as follows: U-shaped silicon-carbon rod is used for heating in the low temperature section, W-shaped silicon-molybdenum rod is used for heating in the heating section and high temperature section, and jacketed water cooling forced cooling is used in the cooling section; the inner lining of the kiln mainly uses fiber cotton board + mullite insulating brick + graphite / corundum wall brick, etc.

[0004] At present, the preparation of vanadium-nitrogen alloy in the industry mainly uses push plate kiln, and the vanadium-nitrogen alloy push plate furnace is the key equipment for continuous and large-scale preparation of vanadium-nitrogen alloy, and its performance directly determines the production cost of the vanadium-nitrogen alloy production plant. The existing heating mode of the vanadium-nitrogen alloy push plate furnace is as follows: silicon-carbon rod is used for heating in the low temperature section (below 700℃), silicon-molybdenum rod is used for heating in the heating section and high temperature section (700-1500℃), the inner lining of the furnace mainly uses fiber cotton board + mullite insulating brick + graphite / magnesia / corundum material, and jacketed water tank cooling is used in the cooling section.

[0005] The existing equipment has the following disadvantages: 1) affected by the surface load of the silicon-molybdenum rod, the maximum service temperature of the silicon-molybdenum rod in the continuous sintering furnace is 1550 DEG C, and a higher temperature cannot be provided, so that the graphite crucible loaded with products stays in the high-temperature zone for a long time; 2) in the preparation process of vanadium-nitrogen alloy, a large amount of alkaline volatile substances (mainly Na2CO3 and K2CO3) are released in the heating section, the alkaline volatile substances corrode the silicon-molybdenum rod, causing the silicon-molybdenum rod to break, and in severe cases, the heating window and the bottom refractory material are also corroded, causing the silicon-molybdenum rod to be unable to be replaced, the equipment needs to be shut down for maintenance, and great losses are caused; 3) since the heating element in the high-temperature section is a silicon-molybdenum rod, and the inner lining insulation material is fiber cotton board + mullite insulation brick + graphite / corundum wall brick, etc., the area where the silicon-molybdenum rod is located cannot be quickly heated or cooled, and if the temperature is quickly raised or lowered, the silicon-molybdenum rod will break, and if the temperature is reasonably raised or lowered (generally 25-30 days), the production manufacturer needs to consume a large amount of electricity, and generally, the equipment needs to consume 100,000 yuan of electricity for each heating and cooling; 4) the existing insulation material in the high-temperature section cannot withstand the high temperature of the graphite heater, and the insulation material (such as graphite felt) that can withstand the high temperature of the graphite heater cannot withstand the weight of the graphite crucible loaded with materials on the guide rail (each crucible weighs about 70-80 kg); 5) since the graphite heater is easily oxidized, and the existing equipment has poor sealing (the furnace body is connected through connecting plates, the connecting plates are thin and only about 10 mm thick, and the connecting plates are only sealed by sealing mud, when sintering for a long time, the connecting plates are easily deformed, the sealing mud is squeezed out, gaps are formed between the connecting plates, and the sealing fails), if the existing silicon-molybdenum rod is directly replaced by a graphite heater, the service life is short, and the preparation of vanadium-nitrogen alloy cannot be stably completed for a long time. SUMMARY

[0006] The technical problem to be solved by the present application is to overcome the shortcomings of the prior art and provide a push plate furnace equipment for vanadium-nitrogen alloy production, which has high production efficiency, short heating and cooling time and long service life.

[0007] To solve the above technical problems, the following technical scheme is adopted: A push plate furnace equipment for vanadium-nitrogen alloy production, comprising a main kiln, wherein the main kiln comprises a low-temperature section, a corrosion section, a high-temperature section and a cooling section connected in sequence, a track for conveying crucibles is arranged in the main kiln, no heating element is arranged in the corrosion section, a graphite heating assembly for directly heating the high-temperature section and radiating heat to the corrosion section is arranged in the high-temperature section, and the graphite heating assembly comprises an upper graphite heating assembly located above the track and a lower graphite heating assembly located below the track.

[0008] As a further improvement of the above technical scheme: The high-temperature section comprises at least one furnace body, the track of the high-temperature section comprises graphite guide rails and a plurality of graphite columns, the graphite columns are inserted into the furnace body, the graphite guide rails are arranged on the graphite columns, and the outer side of the furnace body of the high-temperature section is further provided with a cooling assembly for cooling the furnace body.

[0009] The inner side of the furnace body of the high-temperature section is provided with a first fiber cotton board layer, the inner side of the first fiber cotton board layer is provided with a graphite felt layer, and the graphite columns are sequentially inserted into the bottom of the furnace body through the graphite felt layer and the first fiber cotton board layer.

[0010] The low-temperature section, the corrosion section, the high-temperature section and the temperature-reducing section each comprise at least one furnace body, at least one notch is formed in the connecting plate of the furnace body, the notches of the connecting plates of two adjacent furnace bodies are combined to form a sealed cavity, a sealing pipe is arranged in the sealed cavity, and sealing mud is filled between the sealing pipe and the connecting plate of the furnace body.

[0011] The heating power of the upper graphite heating assembly is 60%-80% of the heating power of the lower graphite heating assembly.

[0012] The upper graphite heating assembly and the lower graphite heating assembly each comprise heating electrodes arranged on both sides of the hearth of the high-temperature section and a plurality of graphite heaters connected between the two heating electrodes, and the plurality of graphite heaters are arranged in a staggered manner.

[0013] The top and the bottom of the hearth of the low-temperature section are each provided with a silicon-carbon rod transversely penetrating the hearth, and the silicon-carbon rod is externally provided with a ceramic sleeve.

[0014] The hearth of the low-temperature section is sequentially provided, from the outside to the inside, with a second fiber cotton board layer, a mullite insulating brick layer and a high-aluminum wall brick layer.

[0015] The top of the low-temperature section and the corrosion section is provided with exhaust ports, and each exhaust port is connected with an exhaust fan.

[0016] The length of the low-temperature section is 5000mm-7000mm, the length of the corrosion section is 3000mm-4500mm, the length of the high-temperature section is 5000mm-7000mm, and the length of the temperature-reducing section is 9000mm-12000mm.

[0017] Compared with the prior art, the application has the following advantages: 1. The push plate furnace equipment for vanadium-nitrogen alloy production of the present application, by using graphite heating components to heat the high-temperature section, the heating temperature is higher compared to silicon-molybdenum rods, which can reduce the residence time of the crucible in the high-temperature section, has high production efficiency, and the graphite heating components can quickly heat up and cool down, shorten the heating and cooling time, and reduce costs; by not setting heating elements in the corrosion section, but radiating heat from the graphite heating components of the high-temperature section to the corrosion section for heating, and the graphite heating components are corrosion-resistant, so that the alkaline volatiles generated during the heating process of the vanadium-nitrogen alloy raw materials in the corrosion section will not corrode the heating elements, prolonging the service life of the equipment.

[0018] 2. The push plate furnace equipment for vanadium-nitrogen alloy production of the present application, the graphite upright columns inserted in the furnace body support the graphite guide rails, so that the weight of the graphite guide rails and the crucible is not borne by the heat preservation material, but by the furnace body, which is reliable and stable in structure; and since the graphite upright columns are inserted in the furnace body, the high temperature of the graphite upright columns is easily conducted into the furnace body 7, while the furnace body is usually made of carbon steel or other materials, which cannot withstand the high temperature of the high-temperature section, therefore, by setting cooling outside the furnace body to cool the outside of the furnace body, preventing the furnace body from being damaged due to excessive temperature, the service life of the equipment can be prolonged.

[0019] 3. The push plate furnace equipment for vanadium-nitrogen alloy production of the present application, the high-temperature section uses a heat preservation layer formed by the combination of the first fiber cotton board layer and the graphite felt layer, which is high-temperature-resistant, has good heat preservation effect, can withstand the high temperature of the graphite heater, and is lightweight, facilitating fast heating and cooling of the equipment, which generally takes only 2-3 days to heat up from room temperature to 1800℃, can quickly respond, and greatly reduces the heating cost of manufacturers.

[0020] 4. The push plate furnace equipment for vanadium-nitrogen alloy production of the present application, when the connecting plates deform after long-term sintering, the sealing tube can self-adaptively fill the gap between the connecting plates, making the sealing reliable and preventing external air from entering, thereby meeting the demand of the graphite heater for low oxygen content.

[0021] 5. The push plate furnace equipment for vanadium-nitrogen alloy production of the present application, since during the sintering process, hot gas flows from bottom to top, and the heating power of the upper graphite heating component is 60%-80% of that of the lower graphite heating component, the temperature in the high-temperature section is more uniform, the heating effect is good, and the energy consumption of the equipment is lower. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 is a side view of the push plate furnace equipment for vanadium-nitrogen alloy production of the present application.

[0023] Figure 2 is a front view of the low-temperature section of the push plate furnace equipment for vanadium-nitrogen alloy production of the present application.

[0024] Figure 3It is the main view of the corrosion section in the push plate furnace equipment for vanadium-nitrogen alloy production of the application.

[0025] Figure 4 It is the main view of the high temperature section in the push plate furnace equipment for vanadium-nitrogen alloy production of the application.

[0026] Figure 5 It is the structure schematic diagram of the track in the high temperature section in the push plate furnace equipment for vanadium-nitrogen alloy production of the application.

[0027] Figure 6 It is the side view of two furnace bodies connected in the push plate furnace equipment for vanadium-nitrogen alloy production of the application.

[0028] The various reference signs in the drawings represent: 1, low temperature section; 11, silicon-carbon rod; 12, second fiber cotton board layer; 13, mullite insulation brick layer; 14, high-alumina wall brick layer; 2, corrosion section; 3, high temperature section; 31, upper graphite heating assembly; 311, heating electrode; 32, lower graphite heating assembly; 33, first fiber cotton board layer; 34, graphite felt layer; 4, cooling section; 5, track; 51, graphite guide rail; 52, graphite column; 6, exhaust fan; 7, furnace body; 71, notch; 72, sealing cavity; 8, cooling assembly; 9, crucible. DETAILED DESCRIPTION

[0029] The application will be further described in detail below in combination with the drawings and specific examples.

[0030] In the description of the application, it should be understood that the terms "length", "width", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the application and simplifying the description, and therefore cannot be understood as indicating or implying that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the application.

[0031] In addition, the terms "first", "second" are only for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined with "first", "second" can explicitly or implicitly include one or more of the features. In the description of the application, the meaning of "multiple" is two or more, unless otherwise specifically limited.

[0032] In the present application, unless otherwise explicitly specified and limited, the terms "assembly", "connection", "linkage", "fixation" and the like should be understood in a broad sense, for example, can be fixed connection, can also be detachable connection, or integral; can be mechanical connection, can also be electrical connection; can be directly connected, can also be indirectly connected through an intermediate medium, can be internal communication of two elements or interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0033] As Figures 1 to 6 The push plate furnace equipment for vanadium-nitrogen alloy production of the embodiment comprises a main kiln, the main kiln comprises a low-temperature section 1, a corrosion section 2, a high-temperature section 3 and a cooling section 4 connected in sequence, a track 5 for conveying the crucible 9 is arranged in the main kiln (that is, the track 5 is arranged in the low-temperature section 1, the corrosion section 2, the high-temperature section 3 and the cooling section 4), no heating element is arranged in the corrosion section 2, a graphite heating assembly for directly heating the high-temperature section 3 and radiating heat to the corrosion section 2 is arranged in the high-temperature section 3, the graphite heating assembly comprises an upper graphite heating assembly 31 located above the track 5 and a lower graphite heating assembly 32 located below the track 5.

[0034] The push plate furnace equipment for vanadium-nitrogen alloy production of the embodiment works, the crucible 9 loaded with vanadium-nitrogen alloy raw materials is conveyed on the track 5, the crucible 9 passes through the track 5 of the low-temperature section 1, the corrosion section 2 and the high-temperature section 3 in sequence and stays to sinter, the sintered vanadium-nitrogen alloy is cooled in the cooling section 4 and then discharged. The push plate furnace equipment for vanadium-nitrogen alloy production of the embodiment uses the graphite heating assembly to heat the high-temperature section 3, compared with the silicon molybdenum rod, the heating temperature is higher, the residence time of the crucible 9 in the high-temperature section 3 can be reduced, the production efficiency is high, and the graphite heating assembly can quickly heat and cool, shorten the heating and cooling time, and reduce the cost; by not arranging the heating element in the corrosion section 2, but radiating heat from the graphite heating assembly of the high-temperature section 3 to the corrosion section 2 for heating, and the graphite heating assembly is corrosion-resistant, so that the alkaline volatile matter generated in the heating process of the vanadium-nitrogen alloy raw materials in the corrosion section 2 will not corrode the heating element, prolonging the service life of the equipment.

[0035] Specifically, the heating element of the high-temperature section 3 is heated by a graphite heating assembly, and the heating power is large, with a heating power of 150-200kw per temperature zone. The process temperature of the high-temperature section 3 is 1800-2000℃. A large amount of heat can be provided for the vanadium nitride nitriding reaction, the nitriding reaction process is accelerated, and the shrinkage speed of the fired product is accelerated, thereby greatly reducing the residence time of the crucible 9 loaded with vanadium nitride in the high-temperature section 3, improving the daily production capacity of the equipment (for example, for a common 36-meter vanadium-nitrogen alloy push plate kiln, the high-temperature zone heating element is changed from the original silicon-molybdenum rod to the graphite heater, and the cycle time of the equipment can be reduced from the original 15min / push plate to 10min / push plate. The equipment nitriding reaction is faster and more complete, and the daily production capacity of the equipment can be increased by about 40-50%. The nitrogen content of the fired product is ≥17%, and the oxygen content is ≤1%).

[0036] Further, as shown in Figure 4 and Figure 5 In the embodiment, the high-temperature section 3 includes at least one furnace body 7, the track 5 of the high-temperature section 3 includes a graphite track 51 and a plurality of graphite columns 52, the graphite columns 52 are inserted into the furnace body 7, the graphite track 51 is arranged on the graphite columns 52, and the outer side of the furnace body 7 of the high-temperature section 3 is further provided with a cooling assembly 8 for cooling the furnace body 7. The graphite track 51 is supported by the graphite columns 52 inserted into the furnace body 7, so that the weight of the graphite track 51 and the crucible 9 is not borne by the heat preservation material, but is borne by the furnace body 7 entirely, and the structure is reliable and stable. In addition, since the graphite columns 52 are inserted into the furnace body 7, the high temperature of the graphite columns 52 is easily conducted to the furnace body 7. However, the furnace body 7 is usually made of carbon steel and cannot withstand the high temperature of the high-temperature section 3. Therefore, the outer side of the furnace body 7 is cooled by the cooling assembly 8 (such as a water bag) arranged outside the furnace body 7, so as to prevent the furnace body 7 from being damaged due to high temperature, and the service life of the equipment can be prolonged.

[0037] Preferably, in the embodiment, the graphite columns 52 are inserted into the channel steel at the bottom of the furnace body 7, and a carbon steel sleeve for fixing the graphite columns 52 is welded in the channel steel, and the structure is stable.

[0038] Further, in the embodiment, the inner side of the furnace body 7 of the high-temperature section 3 is provided with a first fiber cotton board layer 33, the inner side of the first fiber cotton board layer 33 is provided with a graphite felt layer 34, and the graphite columns 52 pass through the graphite felt layer 34 and the first fiber cotton board layer 33 in sequence and are inserted into the bottom of the furnace body 7 (specifically, the channel steel at the bottom of the furnace body 7). The graphite felt layer 34 is formed by combining graphite solidified felt and graphite soft felt. The high-temperature section 3 adopts the heat preservation layer formed by the combination of the first fiber cotton board layer 33 and the graphite felt layer 34, which has high temperature resistance, good heat preservation effect, can withstand the high temperature of the graphite heater, and is lightweight, facilitating rapid heating and cooling of the equipment. It only takes 2-3 days to heat from room temperature to 2000℃, which can quickly respond and greatly reduce the heating cost of the manufacturer (the original traditional silicon-molybdenum rod heating rod needs 20-30 days for one heating).

[0039] Furthermore, such as Figure 6 As shown in this embodiment, the low-temperature section 1, corrosion section 2, high-temperature section 3, and cooling section 4 each include at least one furnace body 7. Three notches 71 are provided on the connecting plates of the furnace body 7. The notches 71 of two adjacent furnace body 7 connecting plates are joined to form a sealing cavity 72. A sealing tube is provided inside the sealing cavity 72, and sealing mud is filled inside the sealing tube and between the sealing tube and the connecting plate of the furnace body 7. Three sealing tubes are provided between the connecting plates of two adjacent furnace bodies 7. When the connecting plates deform during long-term sintering, the sealing tubes can adaptively fill the gaps between the connecting plates, ensuring reliable sealing and preventing external air from entering, thus meeting the low oxygen content requirement of the graphite heater.

[0040] Preferably, in this embodiment, the thickness of the connecting plate of the furnace body 7 is 20mm. The thicker plate is less prone to deformation and has better sealing performance.

[0041] Furthermore, such as Figure 4 As shown, in this embodiment, the heating power of the upper graphite heating component 31 and the lower graphite heating component 32 is controlled independently. During the sintering process, hot gas flows from bottom to top, resulting in uneven temperature distribution. Therefore, separating the temperature control of the upper and lower heating components facilitates on-site adjustments by process personnel, leading to more uniform temperature distribution and lower energy consumption.

[0042] Furthermore, in this embodiment, the heating power of the upper graphite heating component 31 is 60%-80% of the heating power of the lower graphite heating component 32. Since hot gas flows from bottom to top during sintering, when the heating power of the upper graphite heating component 31 is 60%-80% of the heating power of the lower graphite heating component 32, the temperature within the high-temperature section 3 is more uniform, the heating effect is better, and the equipment energy consumption is lower. Preferably, in this embodiment, the heating power of the upper graphite heating component 31 is 70% of the heating power of the lower graphite heating component 32.

[0043] Furthermore, in this embodiment, the upper graphite heating assembly 31 and the lower graphite heating assembly 32 each include heating electrodes 311 disposed on both sides of the furnace chamber in the high-temperature section 3 and multiple graphite heaters connected between the two heating electrodes 311, with the multiple graphite heaters arranged alternately. The graphite heating assemblies are arranged vertically, and the multiple graphite heaters are arranged alternately (not shown in the figure). The crucible 9 moves between the upper graphite heating assembly 31 and the lower graphite heating assembly 32. The heat radiated by the graphite heaters is used for the chemical reaction of the vanadium-nitrogen alloy raw material inside the crucible 9 and the shrinkage of the product, resulting in good heating uniformity.

[0044] Furthermore, such as Figure 2As shown, in the embodiment, the furnace top and bottom of the low-temperature section 1 are each provided with a silicon-carbon rod 11 crossing the furnace, and the silicon-carbon rod 11 is externally provided with a ceramic sleeve. The silicon-carbon rod 11 crosses the furnace of the low-temperature section 1 to heat through the ceramic sleeve, the silicon-carbon rod 11 has relatively low heating cost, and the ceramic sleeve can protect the silicon-carbon rod 11 and block the corrosion of the alkaline corrosive gas.

[0045] Further, in the embodiment, the furnace of the low-temperature section 1 is sequentially provided, from outside to inside, with a second fiber cotton board layer 12, a mullite insulation brick layer 13, and a high-aluminum wall brick layer 14, and has good corrosion resistance.

[0046] Further, in the embodiment, the cooling section 4 includes a natural cooling zone and a forced water cooling zone sequentially arranged along the conveying direction of the crucible 9, and the forced water cooling zone is provided with a stainless steel finned tube. The forced water cooling zone uses the stainless steel finned tube for cooling, has large contact area, and has good cooling effect.

[0047] Further, in the embodiment, the top of the low-temperature section 1 and the corrosion section 2 is provided with an exhaust port, and each exhaust port is connected with an exhaust fan 6. The alkaline volatile matter generated in the heating process of the vanadium-nitrogen alloy raw material in the corrosion section 2 and a small amount of alkaline volatile matter generated in the low-temperature section 1 are discharged through the exhaust port, thereby prolonging the service life of the equipment.

[0048] Further, as shown, Figure 3 In the embodiment, the furnace of the corrosion section 2 is sequentially provided, from outside to inside, with a fiber cotton board layer, a mullite insulation brick layer, and a magnesia material layer, and is built by wet masonry, is not easy to be corroded, and has longer service life of the equipment.

[0049] Further, in the embodiment, the length of the low-temperature section 1 is 5000mm-7000mm, the length of the corrosion section 2 is 3000mm-4500mm, the length of the high-temperature section 3 is 5000mm-7000mm, and the length of the cooling section 4 is 9000mm-12000mm. Since the graphite heating assembly can make the sintering temperature of the high-temperature section 3 reach 1800℃-2000℃, has large heating power, can provide a large amount of heat for the nitriding reaction of the vanadium nitride, accelerate the nitriding reaction process and the shrinkage speed of the fired product, improve the nitrogen content of the fired product, and further reduce the equipment footprint, especially the length requirement of the high-temperature section 3, compared with the length of about 36m of the equipment using the silicon-molybdenum rod, the equipment has shorter length, lower cost, and smaller footprint.

[0050] The above merely describes preferred embodiments of the present application, and is not intended to limit the present application in any form. Although the present application has been disclosed with the preferred embodiments as above, it is not intended to limit the present application. Any person skilled in the art, without departing from the spirit and technical solutions of the present application, can make many possible changes and modifications to the technical solutions of the present application, or modify equivalent embodiments with equivalent changes. Therefore, any simple modification, equivalent replacement, equivalent change and modification made to the above embodiments according to the technical essence of the present application, without departing from the technical solutions of the present application, still belongs to the protection scope of the technical solutions of the present application.

Claims

1. A pusher furnace installation for vanadium-nitrogen alloy production, characterized by: The main kiln comprises a low-temperature section (1), an etching section (2), a high-temperature section (3) and a cooling section (4) connected in sequence, a track (5) for conveying crucibles (9) is arranged in the main kiln, no heating element is arranged in the etching section (2), the high-temperature section (3) is provided with a graphite heating assembly for directly heating the high-temperature section (3) and radiating heat to the etching section (2), and the graphite heating assembly comprises an upper graphite heating assembly (31) above the track (5) and a lower graphite heating assembly (32) below the track (5).

2. The pusher plate furnace apparatus for vanadium-nitrogen alloy production according to claim 1, characterized by: The high-temperature section (3) comprises at least one furnace body (7), the track (5) of the high-temperature section (3) comprises graphite guide rails (51) and a plurality of graphite columns (52), the graphite columns (52) are inserted into the furnace body (7), and the graphite guide rails (51) are arranged on the graphite columns (52).

3. The pusher plate furnace apparatus for vanadium-nitrogen alloy production according to claim 2, characterized by: The inner side of the furnace body (7) of the high-temperature section (3) is provided with a first fiber cotton board layer (33), the inner side of the first fiber cotton board layer (33) is provided with a graphite felt layer (34), and the graphite columns (52) are inserted into the bottom of the furnace body (7) through the graphite felt layer (34) and the first fiber cotton board layer (33) in sequence.

4. The pusher plate furnace apparatus for vanadium-nitrogen alloy production according to claim 1, characterized by: The low-temperature section (1), the etching section (2), the high-temperature section (3) and the cooling section (4) each comprise at least one furnace body (7), at least one notch (71) is formed in the connecting plate of the furnace body (7), the notches (71) of the connecting plates of two adjacent furnace bodies (7) are combined to form a sealed cavity (72), and a sealing pipe is arranged in the sealed cavity (72).

5. The pusher plate furnace apparatus for vanadium-nitrogen alloy production according to claim 1, characterized by: The heating power of the upper graphite heating assembly (31) is 60%-80% of the heating power of the lower graphite heating assembly (32).

6. The pusher plate furnace apparatus for vanadium-nitrogen alloy production according to claim 1, characterized by: The upper graphite heating assembly (31) and the lower graphite heating assembly (32) each comprise heating electrodes (311) arranged on both sides of the hearth of the high-temperature section (3) and a plurality of graphite heaters connected between the two heating electrodes (311), and the plurality of graphite heaters are arranged in a staggered manner.

7. The pusher plate furnace apparatus for vanadium-nitrogen alloy production according to claim 1, characterized by: The top and bottom of the hearth of the low-temperature section (1) are each provided with a silicon-carbon rod (11) transversely crossing the hearth, and a ceramic sleeve is arranged outside the silicon-carbon rod (11).

8. The pusher plate furnace apparatus for vanadium-nitrogen alloy production according to claim 1, characterized by: The hearth of the low-temperature section (1) is sequentially provided, from outside to inside, with a second fiber cotton board layer (12), a mullite heat preservation brick layer (13) and a high-aluminum wall brick layer (14).

9. The pusher plate furnace apparatus for vanadium-nitrogen alloy production according to claim 1, characterized by: The top of the low-temperature section (1) and the etching section (2) is provided with an exhaust port, and each exhaust port is connected with an exhaust fan (6).

10. The pusher furnace installation for vanadium-nitrogen alloy production according to any one of claims 1 to 9, characterized in that: The length of the low-temperature section (1) is 5000mm-7000mm, the length of the etching section (2) is 3000mm-4500mm, the length of the high-temperature section (3) is 5000mm-7000mm, and the length of the cooling section (4) is 9000mm-12000mm.

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