Carbonization section device for producing vanadium-nitrogen alloy by utilizing full-automatic one-step nitrogen protection double-pushed slab kiln

Abstract

The utility model provides a carbonization section device for producing vanadium-nitrogen alloy by utilizing a full-automatic one-step nitrogen protection double-pushed slab kiln. The carbonization section device comprises a first furnace body and a second furnace body which are communicated with each other, the first furnace body is composed of a first outer heat preservation layer, a first inner heat preservation layer and a first fireproof layer which are sequentially distributed from outside to inside, a first kiln chamber cavity composed of a first kiln wall layer, a first graphite box body and a first furnace kiln track layer is formed in the first fireproof layer, and a first furnace kiln bottom layer is arranged below the first furnace kiln track layer. The second furnace body is composed of a second outer heat preservation layer, a second inner heat preservation layer and a second fireproof layer which are sequentially distributed from outside to inside, a second kiln chamber cavity composed of a second kiln wall layer, a second graphite box body and a second furnace track layer is formed in the second fireproof layer, the section height of the first kiln chamber cavity and the section width of the second kiln chamber cavity are 600-700 mm, and the section width of the second kiln chamber cavity is 900-1050 mm. The problems that in the prior art, the product production yield is low, the product production quality is low, the product production energy consumption is high, and the service life of equipment is short are solved.

Description

Technical Field

[0001] The utility model relates to a device for producing vanadium-nitrogen alloy, in particular to a carburizing section device for producing vanadium-nitrogen alloy by using a fully automatic one-step nitrogen-protected double-pushing plate kiln. Background Art

[0002] Metallurgical workers at home and abroad have done a lot of research and development work on the production process control and equipment matching of vanadium nitride. However, due to the difficulty of production and high technical content, this technology has not been widely used in automation applications. Most domestic manufacturers of vanadium nitride generally use nitrogen atmosphere protection pusher kilns, which are also based on the nitrogen atmosphere protection pusher kilns used for sintering magnetic materials. The kiln structure is simple, and the overall kiln cavity structure and cross-section are the same as the pusher kiln used for producing vanadium nitride sintered magnetic materials. As a result, the optimal sintering time of vanadium nitrogen alloy cannot be fully met, the product quality consistency is poor, the energy consumption is generally high, and the cost remains high. At present, most of the traditional vanadium nitrogen alloy production industries at home and abroad use high-frequency furnaces, vertical furnaces, pusher kilns, etc. to complete the reduction, carburization, nitridation, sintering and cooling stages in stages. First, the process output is low and the energy consumption is high; second, a large amount of carbon dioxide and dust are generated during the reduction process. The small space is not conducive to the discharge of smoke and dust, which affects the life of the kiln and product quality.

[0003] In view of the shortcomings of the traditional pusher kiln and high-frequency furnace used in the production of vanadium-nitrogen alloy, providing a carburizing section device for producing vanadium-nitrogen alloy using a fully automatic one-step nitrogen-protected double pusher kiln has become a technical problem that needs to be solved urgently in this field. Utility Model Content

[0004] The main purpose of the utility model is to provide a carburizing section device for producing vanadium-nitrogen alloy by using a fully automatic one-step nitrogen protection double-pushing plate kiln, so as to at least solve the problems of low product production output, low product production quality, high product production energy consumption and short equipment service life in the prior art.

[0005] In order to achieve the above-mentioned purpose, the utility model provides a carburizing section device for producing vanadium-nitrogen alloy by using a fully automatic one-step nitrogen-protected double-pushing kiln, comprising a first furnace body and a second furnace body connected to each other; the first furnace body is composed of a first outer insulation layer, a first inner insulation layer and a first refractory layer distributed in sequence from the outside to the inside, and a first kiln chamber cavity composed of a first kiln wall layer, a first graphite box body and a first kiln track layer is arranged in the first refractory layer, and a first kiln bottom layer is arranged below the first kiln track layer; the second furnace body is composed of a second outer insulation layer, a second inner insulation layer and a second refractory layer distributed in sequence from the outside to the inside The second refractory layer is provided with a second kiln chamber cavity composed of a second kiln wall layer, a second graphite box body and a second kiln track layer, and a second kiln bottom layer is provided below the second kiln track layer; the cavities in the first graphite box body and the second graphite box body form a first upper heating chamber and a second upper heating chamber respectively; the cavity between the first kiln track layer and the first kiln bottom layer forms a first lower heating chamber; the cavity between the second kiln track layer and the second kiln bottom layer forms a second lower heating chamber; wherein, the cross-sectional height of the first kiln chamber cavity and the second kiln chamber cavity is 600-700mm, and the width is 900-1050mm.

[0006] Furthermore, the first furnace body is a rectangular structure furnace body composed of a first outer insulation layer and a first inner insulation layer, a first refractory layer is arranged in the first inner insulation layer, a first kiln wall layer is arranged on both side walls of the inner cavity of the first refractory layer, a first graphite box body is arranged at the top of the inner cavity of the first refractory layer, a first graphite cover plate is arranged above the first graphite box body, and a first kiln track layer is arranged at the bottom of the inner cavity of the first refractory layer; four first smoke exhaust pipes are arranged at intervals on the top of the outlet end of the first furnace body, and the four first smoke exhaust pipes lead vertically downward into the first kiln chamber cavity.

[0007] Furthermore, a first upper window communicating with the first upper heating chamber and a first lower window communicating with the first lower heating chamber are respectively arranged on the side walls of the first furnace body; thermocouples are arranged in the first upper heating chamber and the first lower heating chamber; a first lower air inlet pipe leading to the first lower heating chamber is arranged at the bottom center of the first furnace body, and first side air inlet pipes leading to the first kiln chamber cavity are arranged on both sides of the bottom of the first furnace body.

[0008] Furthermore, the first outer insulation layer adopts two layers of fiberboard insulation layers, and the thickness of the two fiberboard insulation layers is 50 to 100 mm; the first outer insulation layer is arranged on the top layer and one side of the first inner insulation layer; the first inner insulation layer is composed of two layers of high-alumina foam bricks, two layers of mullite polylight layers, and a low-density hollow ball brick structure distributed from the outside to the inside, and the thickness of each layer is 50 to 114 mm; the first refractory layer is composed of a corundum polylight layer, a cast hollow ball layer, a magnesia-zirconium brick layer and a corundum brick layer, and a high-density hollow ball brick structure distributed from the outside to the inside, and the thickness of each layer is 50 to 114 mm; the first kiln wall layer, the first graphite box body and the first furnace track layer are all composed of corundum brick layers or electrode graphite block layers, and the thickness of the first kiln wall layer is 50 to 114 mm.

[0009] Furthermore, the second furnace body 200 is a rectangular structure furnace body composed of a second outer insulation layer 201 and a second inner insulation layer 202, a second refractory layer 203 is provided in the second inner insulation layer 202, second kiln wall layers 204 are provided on both side walls of the inner cavity of the second refractory layer 203, a second graphite box body 205 is provided at the top of the inner cavity of the second refractory layer 203, a second graphite cover plate 206 is provided above the second graphite box body 205, and a second kiln track layer 207 is provided at the bottom of the inner cavity of the second refractory layer 203; four second smoke exhaust pipes 210 are provided at intervals at the top of the outlet end of the second furnace body 200, and the four second smoke exhaust pipes 210 lead vertically downward into the second kiln chamber cavity 208.

[0010] Furthermore, a second upper window communicating with the second upper heating chamber and a second lower window communicating with the second lower heating chamber are respectively arranged on the side walls of the second furnace body; thermocouples are arranged in the second upper heating chamber and the second lower heating chamber; a second lower air inlet pipe leading to the second lower heating chamber is arranged at the bottom center of the second furnace body, and second side air inlet pipes leading to the second kiln chamber cavity are arranged on both sides of the bottom of the second furnace body.

[0011] Furthermore, the second outer insulation layer adopts two layers of fiberboard insulation layer, and the thickness of the two fiberboard insulation layers is 50 to 100 mm; the second outer insulation layer is arranged on the top layer and one side of the second inner insulation layer; the second inner insulation layer is composed of two layers of high-alumina foam brick layers, two layers of mullite polylight layers, and a low-density hollow ball brick structure distributed from the outside to the inside, and the thickness of each layer is 50 to 114 mm; the second refractory layer is composed of a corundum polylight layer, a cast hollow ball layer, a magnesia-zirconium brick layer and a corundum brick layer, and a high-density hollow ball brick structure distributed from the outside to the inside, and the thickness of each layer is 50 to 114 mm; the second kiln wall layer, the second graphite box body and the second kiln track layer are all composed of corundum brick layers or electrode graphite block layers, and the thickness of the second kiln wall layer is 50 to 114 mm.

[0012] The utility model discloses a device for producing a carburizing section of a vanadium-nitrogen alloy by using a fully automatic one-step nitrogen-protected double-pushing kiln, comprising a first furnace body and a second furnace body that are interconnected; the first furnace body is composed of a first outer thermal insulation layer, a first inner thermal insulation layer and a first refractory layer that are sequentially distributed from the outside to the inside, and a first kiln chamber cavity composed of a first kiln wall layer, a first graphite box body and a first kiln track layer is arranged in the first refractory layer, and a first kiln bottom layer is arranged below the first kiln track layer; the second furnace body is composed of a second outer thermal insulation layer, a second inner thermal insulation layer and a second refractory layer that are sequentially distributed from the outside to the inside, and a second refractory layer is arranged in the second refractory layer composed of a second kiln wall layer, a second graphite box body and a second The second kiln chamber cavity is formed by the kiln track layer, and the second kiln bottom layer is arranged below the second kiln track layer; the cavities in the first graphite box body and the second graphite box body respectively form the first upper heating chamber and the second upper heating chamber; the cavity between the first kiln track layer and the first kiln bottom layer forms the first lower heating chamber; the cavity between the second kiln track layer and the second kiln bottom layer forms the second lower heating chamber; wherein, the cross-sectional height of the first kiln chamber cavity and the second kiln chamber cavity is 600-700mm, and the width is 900-1050mm, which solves the problems of low product production output, low product production quality, high product production energy consumption and short equipment service life in the prior art.

[0013] The beneficial effects of the technical solution of the utility model are:

[0014] 1. The material in this carbonization stage expands in the crucible, and the expansion volume can reach 1.2-1.5 times of the original material, and a large amount of carbon dioxide and harmful metal elements are discharged. The boiling point and distribution of the gas in the kiln are determined by reasonably setting the position, number and size of the exhaust port to discharge water vapor and low boiling, so that harmful metal elements and other compounds are discharged in time, which greatly reduces the corrosion of the waste gas to the materials in the kiln, slows down the corrosion rate of the lining materials in the kiln, and prolongs the service life of the kiln;

[0015] 2. The utility model has the largest kiln cavity cross-section, which is used to promote the discharge of harmful gases, and reasonably designed nitrogen curve and temperature curve to promote full, uniform and complete reaction in each stage, with good product consistency, high density, high output and low energy consumption (3000℃ / TVN), which can fully realize industrialized production. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The drawings constituting part of the present application are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention. In the drawings:

[0017] Figure 1 It is a top view structural schematic diagram of a carburizing section device for producing vanadium-nitrogen alloy by using a fully automatic one-step nitrogen-protected double-pushing kiln according to an embodiment of the utility model;

[0018] Figure 2 It is a schematic diagram of the first furnace structure of a device for producing a carburizing section of a vanadium-nitrogen alloy by using a fully automatic one-step nitrogen-protected double-pushing kiln according to an embodiment of the utility model;

[0019] Figure 3 It is a schematic diagram of the second furnace structure of a device for producing a carburizing section of a vanadium-nitrogen alloy by using a fully automatic one-step nitrogen-protected double-pushing kiln according to an embodiment of the utility model;

[0020] The above drawings include the following reference numerals:

[0021] 100, first furnace body; 101, first outer insulation layer; 102, first inner insulation layer; 103, first refractory layer; 104, first kiln wall layer; 105, first graphite box body; 106, first graphite cover plate; 107, first kiln track layer; 108, first kiln chamber cavity; 109, first kiln bottom layer; 110, first smoke exhaust pipe; 111, first upper heating chamber; 112, first lower heating chamber; 113, first upper window; 114, first lower window; 115, first lower air inlet pipe; 116, first side air inlet pipe ; 200, second furnace body; 201, second outer insulation layer; 202, second inner insulation layer; 203, second refractory layer; 204, second kiln wall layer; 205, second graphite box body; 206, second graphite cover plate; 207 second kiln track layer; 208, second kiln chamber cavity; 209, second kiln bottom layer; 210, second smoke exhaust pipe; 211, second upper heating chamber; 212, second lower heating chamber; 213, second upper window; 214, second lower window; 215, second lower air inlet pipe; 216, second side air inlet pipe. DETAILED DESCRIPTION

[0022] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present utility model will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0023] like Figures 1 to 3As shown, the utility model provides a carburizing section device for producing vanadium-nitrogen alloy by using a fully automatic one-step nitrogen protection double push plate kiln, characterized in that it comprises a first furnace body 100 and a second furnace body 200 which are interconnected; the first furnace body 100 is composed of a first outer thermal insulation layer 101, a first inner thermal insulation layer 102 and a first refractory layer 103 which are sequentially distributed from the outside to the inside, and a first kiln chamber cavity 108 which is composed of a first kiln wall layer 104, a first graphite box body 105 and a first kiln track layer 107 is arranged in the first refractory layer 103, and a first kiln bottom layer 109 is arranged below the first kiln track layer 107; the second furnace body 200 is composed of a second outer thermal insulation layer 201, a second inner thermal insulation layer 202 and a second refractory layer 203 which are sequentially distributed from the outside to the inside, and a first kiln chamber cavity 108 which is composed of a second kiln wall layer 204, a second graphite box body 205 and a first kiln track layer 107 is arranged in the second refractory layer 203 The second kiln track layer 207 constitutes a second kiln chamber cavity 208, and a second kiln bottom layer 209 is arranged below the second kiln track layer 207; the cavities in the first graphite box body 105 and the second graphite box body 205 respectively form a first upper heating chamber 111 and a second upper heating chamber 211; the cavity between the first kiln track layer 107 and the first kiln bottom layer 109 forms a first lower heating chamber 112; the cavity between the second kiln track layer 207 and the second kiln bottom layer 209 forms a second lower heating chamber 212; wherein, the cross-sectional height of the first kiln chamber cavity 108 and the second kiln chamber cavity 208 is 600-700mm, and the width is 900-1050mm, which expands the cross-sectional area of ​​the kiln chamber cavity, and the kiln chamber cavity has the largest cross-sectional area. The largest kiln chamber cross-sectional area is utilized to promote the discharge of harmful gases, thereby ensuring higher product quality and higher production efficiency.

[0024] Furthermore, if Figure 2 As shown, the first furnace body 100 is a rectangular structure furnace body composed of a first outer insulation layer 101 and a first inner insulation layer 102. A first refractory layer 103 is arranged in the first inner insulation layer 102. The first kiln wall layer 104 is arranged on both sides of the inner cavity of the first refractory layer 103. A first graphite box body 105 is arranged on the top of the inner cavity of the first refractory layer 103. A first graphite cover plate 106 is arranged above the first graphite box body 105. A first kiln track layer 107 is arranged at the bottom of the inner cavity of the first refractory layer 103. Four first smoke exhaust pipes 110 are arranged at intervals on the top of the outlet end of the first furnace body 100. The four first smoke exhaust pipes (110) lead vertically downward into the first kiln chamber cavity 108. The utility model enlarges the cross-sectional area of ​​the kiln chamber cavity, reasonably sets the position, number and size of the exhaust port, and discharges water vapor, low boiling points, and thus harmful metal elements and other compounds in time, greatly reducing the corrosion of the waste gas to the materials in the kiln, slowing down the corrosion rate of the lining materials in the kiln, so as to increase the service life of the kiln.

[0025] Furthermore, if Figure 2As shown, the side walls of the first furnace body 100 are respectively provided with a first upper window 113 communicating with the first upper heating chamber 111 and a first lower window 114 communicating with the first lower heating chamber 112; thermocouples are provided in the first upper heating chamber 111 and the first lower heating chamber 112; a first lower air inlet pipe 115 leading to the first lower heating chamber 112 is provided at the bottom center of the first furnace body 100, and first side air inlet pipes 116 leading to the first kiln chamber cavity 108 are provided on both sides of the bottom of the first furnace body 100. A thermocouple is arranged in the lower heating chamber 112, and the temperature in the first upper heating chamber 111 and the first lower heating chamber 112 can be monitored in real time by a high-precision sensor to better control the reduction temperature. The first lower air inlet pipe 115 is used to introduce nitrogen into the first lower heating chamber 112, so as to protect the various heating components in the first lower heating chamber 112. The first side air inlet pipe 116 is used to introduce nitrogen into the first kiln chamber cavity 108, so as to provide nitrogen reactants and discharge oxygen in the first kiln chamber cavity 108 to ensure that the reduction reaction is fully carried out.

[0026] Furthermore, if Figure 2 As shown, the first outer insulation layer 101 adopts two layers of fiberboard insulation layer, and the thickness of the two fiberboard insulation layers is 50-100mm; the first outer insulation layer 101 is arranged on the top layer and one side of the first inner insulation layer 102; the first inner insulation layer 102 is composed of two layers of high-aluminum foam brick layers, two layers of mullite polylight layers, and low-density hollow ball brick structure distributed from the outside to the inside, and the thickness of each layer is 50-114mm; the first refractory layer 103 is composed of a corundum polylight layer, a cast hollow ball layer, a magnesia-zirconium brick layer and a corundum brick layer, and a high-density hollow ball brick structure distributed from the outside to the inside, and the thickness of each layer is 50-114mm; the first kiln wall layer 104, the first graphite box body 105 and the first kiln track layer 107 are all composed of corundum brick layers or electrode graphite block layers, and the thickness of the first kiln wall layer 104 is 50-114mm.

[0027] Furthermore, if Figure 3As shown, the second furnace body 200 is a rectangular structure furnace body composed of a second outer insulation layer 201 and a second inner insulation layer 202, a second refractory layer 203 is arranged in the second inner insulation layer 202, and second kiln wall layers 204 are arranged on both sides of the inner cavity of the second refractory layer 203, a second graphite box body 205 is arranged on the top of the inner cavity of the second refractory layer 203, a graphite cover plate 206 is arranged above the second graphite box body 205, a second kiln track layer 207 is arranged at the bottom of the inner cavity of the second refractory layer 203, and the lower part of the second kiln track layer 207 is provided with a second kiln track layer 207. A second kiln bottom layer 209 is also provided; two second smoke exhaust pipes 210 are arranged at intervals on the top of the outlet end of the second furnace body 200, and the two second smoke exhaust pipes 210 lead vertically downward to the second kiln chamber cavity 208. The utility model expands the cross-sectional area of ​​the kiln chamber cavity, reasonably arranges the position, number and size of the exhaust port, and discharges water vapor, low boiling points, and thus harmful metal elements and other compounds in time, greatly reducing the corrosion of the waste gas to the materials in the kiln, slowing down the corrosion rate of the lining materials in the kiln, so as to increase the service life of the kiln.

[0028] Furthermore, if Figure 3 As shown, the side walls of the second furnace body 200 are respectively provided with a second upper window 213 communicating with the second upper heating chamber 211 and a second lower window 214 communicating with the second lower heating chamber 212; thermocouples are provided in the second upper heating chamber 211 and the second lower heating chamber 212; a second lower air inlet pipe 215 leading to the second lower heating chamber 212 is provided at the bottom center of the second furnace body 200, and second side air inlet pipes 216 leading to the second kiln chamber cavity 208 are provided on both sides of the bottom of the second furnace body 200. A thermocouple is arranged in the second lower heating chamber 212, and the temperature in the second upper heating chamber 211 and the second lower heating chamber 212 can be monitored in real time by a high-precision sensor to better control the reduction temperature. The second lower air inlet pipe 215 is used to introduce nitrogen into the second lower heating chamber 212, so as to protect the various heating components in the second lower heating chamber 212. The second side air inlet pipe 216 is used to introduce nitrogen into the first kiln chamber cavity 208, so as to provide nitrogen reactants and discharge oxygen in the second kiln chamber cavity 208 to ensure that the reduction reaction is fully carried out.

[0029] Furthermore, if Figure 3As shown, the second outer insulation layer 201 adopts two layers of fiberboard insulation layer, and the thickness of the two fiberboard insulation layers is 50-100mm; the second outer insulation layer 201 is arranged on the top layer and one side of the second inner insulation layer 202; the second inner insulation layer 202 is composed of two layers of high-aluminum foam brick layers, two layers of mullite poly-light layers, and low-density hollow ball brick structures distributed from the outside to the inside, and the thickness of each layer is 50-114mm; the second refractory layer 203 is composed of a corundum poly-light layer, a cast hollow ball layer, a magnesia-zirconium brick layer and a corundum brick layer, and a high-density hollow ball brick structure distributed from the outside to the inside, and the thickness of each layer is 50-114mm; the second kiln wall layer 204, the second graphite box body 205 and the second kiln track layer 207 are all composed of corundum brick layers or electrode graphite block layers, and the thickness of the second kiln wall layer 204 is 50-114mm.

[0030] The above description is only the preferred embodiment of the utility model, and is not intended to limit the utility model. For those skilled in the art, the utility model can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. A fully automatic one-step nitrogen-protected double pusher kiln for producing a vanadium-nitrogen alloy carburizing section device, comprising: A first furnace body (100) and a second furnace body (200) that are interconnected; The first furnace body (100) is composed of a first outer insulation layer (101), a first inner insulation layer (102) and a first refractory layer (103) which are sequentially arranged from the outside to the inside; a first kiln chamber cavity (108) composed of a first kiln wall layer (104), a first graphite box body (105) and a first kiln track layer (107) is arranged in the first refractory layer (103); a first kiln bottom layer (109) is arranged below the first kiln track layer (107); The second furnace body (200) is composed of a second outer insulation layer (201), a second inner insulation layer (202) and a second refractory layer (203) which are sequentially arranged from the outside to the inside; a second kiln chamber cavity (208) composed of a second kiln wall layer (204), a second graphite box body (205) and a second kiln track layer (207) is arranged in the second refractory layer (203); a second kiln bottom layer (209) is arranged below the second kiln track layer (207); The cavities in the first graphite box body (105) and the second graphite box body (205) respectively form a first upper heating chamber (111) and a second upper heating chamber (211); the cavity between the first furnace track layer (107) and the first furnace bottom layer (109) forms a first lower heating chamber (112); and the cavity between the second furnace track layer (207) and the second furnace bottom layer (209) forms a second lower heating chamber (212); The first kiln chamber cavity (108) and the second kiln chamber cavity (208) have a cross-sectional height of 600-700 mm and a width of 900-1050 mm.

2. The carbonization stage device for producing vanadium-nitrogen alloy by using a fully automatic one-step nitrogen-protected double-pushing kiln according to claim 1 is characterized in that: The first furnace body (100) is a rectangular furnace body composed of the first outer insulation layer (101) and the first inner insulation layer (102); the first refractory layer (103) is provided inside the first inner insulation layer (102); the first kiln wall layer (104) is provided on both side walls of the inner cavity of the first refractory layer (103); the first graphite box body (105) is provided on the top of the inner cavity of the first refractory layer (103); the first graphite cover plate (106) is provided above the first graphite box body (105); and the first kiln track layer (107) is provided at the bottom of the inner cavity of the first refractory layer (103); Four first smoke exhaust pipes (110) are arranged at intervals on the top of the outlet end of the first furnace body (100), and the four first smoke exhaust pipes (110) extend vertically downward into the first kiln chamber cavity (108).

3. The carbonization stage device for producing vanadium-nitrogen alloy by using a fully automatic one-step nitrogen-protected double-pushing kiln according to claim 1 is characterized in that: A first upper window (113) communicating with the first upper heating chamber (111) and a first lower window (114) communicating with the first lower heating chamber (112) are respectively arranged on the side walls of the first furnace body (100); The first upper heating chamber (111) and the first lower heating chamber (112) are both provided with thermocouples; A first lower air inlet pipe (115) leading to the first lower heating chamber (112) is arranged at the bottom center of the first furnace body (100), and first side air inlet pipes (116) leading to the first kiln chamber cavity (108) are arranged on both sides of the bottom of the first furnace body (100).

4. The carbonization stage device for producing vanadium-nitrogen alloy by using a fully automatic one-step nitrogen-protected double-pushing kiln according to claim 1 is characterized in that: The first outer thermal insulation layer (101) is made of two fiberboard thermal insulation layers, and the thickness of the two fiberboard thermal insulation layers is 50-100 mm; the first outer thermal insulation layer (101) is arranged on the top layer and one side of the first inner thermal insulation layer (102); The first inner thermal insulation layer (102) is composed of two layers of high-alumina foam bricks, two layers of mullite polylight layers, and a low-density hollow ball brick structure, which are sequentially distributed from the outside to the inside, and the thickness of each layer is 50 to 114 mm; The first refractory layer (103) is composed of a corundum polylight layer, a cast hollow ball layer, a magnesia zirconium brick layer, a corundum brick layer, and a high-density hollow ball brick structure, which are distributed in sequence from the outside to the inside, and the thickness of each layer is 50 to 114 mm; The first kiln wall layer (104), the first graphite box body (105) and the first kiln track layer (107) are all made of corundum brick layers or electrode graphite block layers. The thickness of the first kiln wall layer (104) is 50-114 mm.

5. The carbonization stage device for producing vanadium-nitrogen alloy by using a fully automatic one-step nitrogen-protected double pusher kiln according to claim 1 is characterized in that: The second furnace body (200) is a rectangular furnace body composed of the second outer insulation layer (201) and the second inner insulation layer (202); the second refractory layer (203) is provided inside the second inner insulation layer (202); the second kiln wall layer (204) is provided on both side walls of the inner cavity of the second refractory layer (203); the second graphite box body (205) is provided on the top of the inner cavity of the second refractory layer (203); the second graphite cover plate (206) is provided above the second graphite box body (205); and the second kiln track layer (207) is provided at the bottom of the inner cavity of the second refractory layer (203); Four second smoke exhaust pipes (210) are arranged at intervals on the top of the outlet end of the second furnace body (200), and the four second smoke exhaust pipes (210) extend vertically downward into the second kiln chamber cavity (208).

6. The carbonization stage device for producing vanadium-nitrogen alloy by using a fully automatic one-step nitrogen-protected double pusher kiln according to claim 5, characterized in that: A second upper window (213) communicating with the second upper heating chamber (211) and a second lower window (214) communicating with the second lower heating chamber (212) are respectively arranged on the side walls of the second furnace body (200); The second upper heating chamber (211) and the second lower heating chamber (212) are both provided with thermocouples; A second lower air inlet pipe (215) leading to the second lower heating chamber (212) is arranged at the bottom center of the second furnace body (200), and second side air inlet pipes (216) leading to the second kiln chamber cavity (208) are arranged on both sides of the bottom of the second furnace body (200).

7. The carbonization stage device for producing vanadium-nitrogen alloy by using a fully automatic one-step nitrogen-protected double pusher kiln according to claim 1, characterized in that: The second outer thermal insulation layer (201) is composed of two fiberboard thermal insulation layers, the thickness of the two fiberboard thermal insulation layers is 50-100 mm; the second outer thermal insulation layer (201) is arranged on the top layer and one side of the second inner thermal insulation layer (202); the second inner thermal insulation layer (202) is composed of two high-aluminum foam brick layers, two mullite polylight layers, and a low-density hollow ball brick structure, which are sequentially distributed from the outside to the inside, and the thickness of each layer is 50-114 mm; The second refractory layer (203) is composed of a corundum polylight layer, a cast hollow ball layer, a magnesia zirconium brick layer, a corundum brick layer, and a high-density hollow ball brick structure, which are distributed in sequence from the outside to the inside, and the thickness of each layer is 50 to 114 mm; The second kiln wall layer (204), the second graphite box body (205) and the second kiln track layer (207) are all made of corundum brick layers or electrode graphite block layers. The thickness of the second kiln wall layer (204) is 50-114 mm.

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