Furnace roof structure and applicable electric roasting furnace

Abstract

The present application provides a furnace roof structure and an electric roasting furnace applicable thereto. The furnace roof structure comprises: a furnace cover having a first exhaust passage extending therethrough; and a furnace roof material layer located below the furnace cover. The furnace roof material layer comprises at least a plurality of first-class coke particles, wherein the first-class coke particles have a particle size range of 5 mm to 8 mm and include calcined petroleum coke particles and / or graphitized coke particles. The first-class coke particles form a second exhaust passage in the furnace roof material layer through interparticle spaces, and the second exhaust passage corresponds spatially to the first exhaust passage. The furnace roof structure and the electric roasting furnace applicable thereto of the present application can improve the yield of carbon products and reduce production costs.

Description

Technical Field

[0001] The present application mainly relates to the field of carbon product roasting, and in particular to a furnace top structure and an electric roasting furnace applicable thereto. Background Art

[0002] In the field of graphitization, existing sintering methods cannot effectively improve product quality and reduce costs for conventional carbon-graphite products, such as large-scale steelmaking electrodes and large-scale aluminum cathodes. For these conventional carbon products, especially large-scale carbon-graphite products (such as electrodes, anodes, cathodes, and crucibles), in order to achieve the goals of improving production quality and reducing production costs, in addition to improving raw material properties, improving the performance balance between raw materials, and improving mixing quality, the quality of sintering is a very important link.

[0003] Furthermore, in the existing market, specialty carbon products, such as isostatic graphite, generally suffer from low performance, limited product variety, and a lack of production of ultra-large, high-performance isostatic graphite, or the poor quality of ultra-large products that are produced. This is primarily due to the difficulty in firing large-sized isostatic graphite products, resulting in low yields and high manufacturing costs. Uneven firing quality can easily lead to secondary cracking during graphitization, resulting in a total yield of less than 40% after graphitization.

[0004] Therefore, the field urgently needs a technical solution for improving the sintering quality of graphitized products. Summary of the Invention

[0005] The technical problem to be solved by the present application is to provide a furnace top structure and an electric roasting furnace applicable thereto, which can improve the yield of carbon products and reduce production costs.

[0006] In order to solve the above technical problems, the present application provides a furnace top structure of an electric roasting furnace, comprising: a furnace cover, the furnace cover having a first exhaust channel running through it; a furnace top material layer, located below the furnace cover, the furnace top material layer comprising at least a plurality of first-type coke particles, the particle size range of the first-type coke particles being 5mm~8mm, and the first-type coke particles comprising calcined petroleum coke particles and / or graphitized coke particles, wherein the first-type coke particles form a second exhaust channel in the furnace top material layer through the gaps between the particles, and the second exhaust channel and the first exhaust channel correspond to each other in space.

[0007] Optionally, the material of the furnace cover includes high-aluminum refractory material.

[0008] Optionally, the furnace cover includes a plurality of furnace cover units, and the shape of each furnace cover unit includes square or rectangular, wherein the distance between each two adjacent furnace cover units is 30 mm to 50 mm.

[0009] Optionally, the top of each furnace cover unit includes a support structure, and the support structure includes reinforcing ribs and / or support plates.

[0010] Optionally, the bottom of each furnace cover unit has a plurality of smoke collection ports, which correspond to the second exhaust channels in space.

[0011] Optionally, the top of each furnace cover unit has at least one smoke outlet, and the at least one smoke outlet is connected to the multiple smoke collection ports through the first exhaust channel.

[0012] Optionally, the diameter of the smoke outlet is greater than or equal to the diameter of the smoke collection port.

[0013] Optionally, the furnace top material layer only includes the plurality of first type coke particles, and the gaps between the plurality of first type coke particles form the second exhaust channel.

[0014] Optionally, the furnace top material layer further includes a plurality of second type coke particles, and the particle size of at least some of the second type coke particles is smaller than the particle size of the first type coke particles.

[0015] Optionally, the particle size range of the second type of coke particles is 0-2 mm, and the second type of coke particles include calcined petroleum coke particles and / or graphitized coke particles.

[0016] Optionally, the content of the second type of coke particles with a particle size of less than 0.5 mm in the furnace top material layer is not greater than 25%.

[0017] Optionally, the region of the furnace top material layer containing the second type of coke particles forms a thermal insulation material layer, wherein, in the thermal insulation material layer, the ratio of the first type of coke particles to the second type of coke particles is 1:18~22.

[0018] Optionally, the thickness of the thermal insulation layer is 300 mm to 500 mm.

[0019] Optionally, the second exhaust channel formed by the first coke-like particles in the thermal insulation material layer includes a columnar structure, and the diameter of the columnar structure is 100 mm to 500 mm.

[0020] Another aspect of the present application further provides an electric roasting furnace, comprising the furnace top structure described in any embodiment of the present application; and a main flue connected to the first exhaust channel of the furnace cover in the furnace top structure.

[0021] Optionally, a flue gas connecting pipe is further included for connecting the first exhaust channel and the main flue.

[0022] Optionally, furnace head electrodes are further included, which are located at both ends of the length direction of the electric roasting furnace.

[0023] Optionally, a power source and a wire are further included, and the furnace head electrode is suitable for being connected to the power source via the wire.

[0024] Optionally, a product loading area is further included, wherein the product loading area is suitable for placing one or more product blanks, wherein the furnace top material layer in the furnace top structure is located above the product loading area.

[0025] Optionally, the furnace cover has a lower surface facing the product loading area, wherein the ratio of the weight of the furnace cover to the area of ​​the lower surface is 2 tons to 6 tons per square meter.

[0026] Optionally, it further comprises a filling material suitable for filling the area outside the product blank in the product filling area.

[0027] Optionally, the filling material includes first-type coke particles that are the same as the furnace top material layer in the furnace top structure, and the first-type coke particles are configured to generate resistive heat after the product loading area is energized, and the resistive heat is used to heat the product blank.

[0028] Optionally, it also includes a furnace bottom material layer located below the product loading area, and the furnace bottom material layer includes second-type coke particles, wherein the particle size range of the second-type coke particles is 0~2mm, and the second-type coke particles include calcined petroleum coke particles and / or graphitized coke particles.

[0029] Optionally, the thickness of the furnace bottom material layer is 100 mm to 200 mm.

[0030] Optionally, one or more temperature measuring devices are further included and located in the filling material.

[0031] Optionally, a furnace wall is further included, at least partially surrounding the product loading area.

[0032] Optionally, there is a gap between the furnace cover and the furnace wall, and the width of the gap is 30 mm to 50 mm.

[0033] Compared to existing technologies, this application offers the following advantages: By providing corresponding exhaust channels in the furnace cover and the roof material layer, this application facilitates the collection of asphalt fumes generated during product firing, eliminating the need for additional exhaust gas equipment. Furthermore, while the furnace cover provides excellent thermal insulation, it can achieve a low-cost increase in the yield of carbon products. Preferably, smaller coke particles can be introduced into the roof material layer to further improve insulation. Furthermore, the pressure range of the furnace cover relative to the product loading area can be set to achieve a pressurized roasting effect on the product blanks, further improving the yield of carbon products. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] The accompanying drawings are included to provide a further understanding of the present application. They are incorporated into and constitute a part of this application. The accompanying drawings illustrate embodiments of the present application and, together with this specification, serve to explain the principles of the present application. In the accompanying drawings:

[0035] Figure 1 This is a schematic diagram of a furnace roof structure of an electric roasting furnace according to an embodiment of the present application;

[0036] Figure 2 is a cross-sectional view from a side perspective of an electric roasting furnace according to one embodiment of the present application;

[0037] Figure 3 This is a cross-sectional view from a front view of an electric roasting furnace according to one embodiment of the present application;

[0038] Figure 4 This is a schematic top view of an electric roasting furnace according to an embodiment of the present application;

[0039] Figure 5 This is a schematic diagram of a top view of a furnace cover unit in a furnace roof structure of an electric roasting furnace according to an embodiment of the present application. DETAILED DESCRIPTION

[0040] To more clearly illustrate the technical solutions of the embodiments of this application, the following is a brief introduction to the drawings required for describing the embodiments. Obviously, the drawings described below are merely examples or embodiments of this application. Those skilled in the art can apply this application to other similar scenarios based on these drawings without inventive effort. Unless otherwise apparent from the context or otherwise noted, the same reference numerals in the figures represent the same structure or operation.

[0041] As used in this application and the claims, unless the context clearly indicates otherwise, the words "a," "an," "an," and / or "the" are not intended to refer to the singular but may include the plural. Generally speaking, the terms "comprises" and "include" only indicate the inclusion of the steps and elements specifically identified, and these steps and elements do not constitute an exclusive list. A method or apparatus may also include other steps or elements.

[0042] Unless otherwise specifically stated, the relative arrangement of the parts and steps, numerical expressions and numerical values ​​set forth in these embodiments do not limit the scope of the present application. At the same time, it should be understood that, for ease of description, the sizes of the various parts shown in the drawings are not drawn according to actual proportional relationships. The techniques, methods and equipment known to those of ordinary skill in the relevant art may not be discussed in detail, but where appropriate, the techniques, methods and equipment should be considered as part of the authorization specification. In all examples shown and discussed here, any specific values ​​should be interpreted as being merely exemplary and not as limitations. Therefore, other examples of the exemplary embodiments may have different values. It should be noted that similar numbers and letters represent similar items in the following figures, and therefore, once an item is defined in one figure, it does not need to be further discussed in subsequent figures.

[0043] In the description of this application, it should be understood that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "horizontal, vertical, vertical, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the device or element referred to must have a specific direction or be constructed and operated in a specific direction. Therefore, they cannot be understood as limiting the scope of protection of this application; the directional words "inside and outside" refer to the inside and outside relative to the outline of each component itself.

[0044] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used herein to describe the spatial positional relationship of a device or feature to other devices or features as shown in the figures. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figures. For example, if the device in the drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0045] Furthermore, it should be noted that the use of terms such as "first" and "second" to define components is solely for the purpose of distinguishing the corresponding components. Unless otherwise stated, these terms have no special meaning and therefore should not be construed as limiting the scope of protection of this application. Furthermore, while the terms used in this application are selected from commonly known and commonly used terms, some terms mentioned in this specification may have been selected by the applicant at his or her discretion, and their detailed meanings are explained in the relevant sections of this description. Furthermore, this application should be understood not only by the actual terms used, but also by the meaning implied by each term.

[0046] It should be understood that when a component is referred to as being “on another component,” “connected to another component,” “coupled to another component,” or “contacting another component,” it can be directly on, connected to, coupled to, or contacting the other component, or intervening components may be present. In contrast, when a component is referred to as being “directly on another component,” “directly connected to,” “directly coupled to,” or “directly contacting” another component, there are no intervening components. Similarly, when a first component is referred to as being “electrically in contact with” or “electrically coupled to” a second component, an electrical path exists between the first and second components that allows current to flow. This electrical path may include capacitors, coupled inductors, and / or other components that allow current to flow, even without direct contact between the conductive components.

[0047] This application refers to Figure 1 A furnace roof structure 10 of an electric roasting furnace is proposed. The furnace roof structure 10 includes a furnace cover 11, and the furnace cover 11 has a first exhaust channel 110 running through it. The furnace roof structure 10 also includes a furnace roof material layer 12, which is located below the furnace cover 11. The furnace roof material layer 12 includes at least a plurality of first-class coke particles. The particle size of the first-class coke particles ranges from 5mm to 8mm, and the first-class coke particles include calcined petroleum coke particles and / or graphitized coke particles. In particular, the plurality of first-class coke particles form a second exhaust channel 120 in the furnace roof material layer 12 through the gaps between the particles. Figure 1 The dotted rectangular frame only schematically shows the possible shape of the second exhaust channel 120. In actual applications, the second exhaust channel 120 may be embodied as multiple channels, each channel corresponding to the path of the flue gas flow, and finally converged into the first exhaust channel 110 in the furnace cover 11. Figure 1As shown, the second exhaust channel 120 and the first exhaust channel 110 are spatially aligned. In this manner, when the furnace roof structure 10 is used in an electric roasting furnace, asphalt fumes and other waste gases generated during the roasting process can pass through the second exhaust channel 120 and continue through the first exhaust channel 110 before being discharged outside the furnace roof 11. Specifically, for electric roasting furnaces in which the furnace roof structure 10 is used, the resistor material for the high-temperature roasted products can be the same material as the first-type coke particles. This will be explained in detail below.

[0048] exist Figure 1 Based on the embodiment shown, Figures 2 to 4 Also shown is an electric roasting furnace 20 proposed in this application, which can be used in this application as shown in FIG. Figure 1 The furnace roof structure 10 shown and its preferred variants are shown below. Figures 2 to 4 Provide detailed explanation.

[0049] according to Figures 2 to 4 , the present application proposes an electric roasting furnace 20, wherein Figure 2 is a cross-sectional view of the electric roasting furnace 20 from a side perspective, Figure 3 A cross-sectional view of the electric roasting furnace 20 from a top view and Figure 4 Schematic diagram of the top view of the electric roasting furnace 20. The electric roasting furnace 20 includes a furnace top structure 21 proposed in any embodiment of the present application, and the furnace top structure 21 can be based on Figure 1 The preferred variant of the furnace roof structure 10 is shown. Figure 4 The electric roasting furnace 20 has a main flue 22; further combined Figure 2 ,like Figure 4 The main flue 22 shown is similar to the Figure 2 The first exhaust passage 2110 of the furnace cover 211 in the furnace roof structure 21 is connected. Figure 4 The electric roasting furnace 20 further includes a smoke connecting pipe 221 for connecting the first exhaust channel 2110 and the main smoke channel 22. Figure 2 and Figure 3 The furnace top structure 21 also has a furnace top material layer 212, which is located below the furnace cover 211 and includes a plurality of first-class coke particles. These first-class coke particles form a second exhaust channel 2120 through the gaps between the particles. The second exhaust channel 2120 and the first exhaust channel 2110 correspond to each other in space.

[0050] Specifically, in this embodiment, Figure 3 and Figure 4 The furnace cover 211 includes a plurality of furnace cover units 210 (where Figure 4The furnace cover unit 210 is framed by a dotted line. For the sake of illustration, the range of the dotted line frame is slightly larger than the boundary position of the furnace cover unit 210. The shape of each furnace cover unit 210 includes square or rectangular. Figure 3 As shown more clearly, in this embodiment, a spacing of 30 mm to 50 mm is preferably provided between each adjacent furnace cover unit 210. By setting the spacing between adjacent furnace cover units, the thermal expansion deformation caused by the high temperature during operation of the electric roasting furnace 20 can be better accommodated, thereby improving the reliability of the electric roasting process.

[0051] according to Figure 2 The bottom of each furnace cover unit 210 has a plurality of smoke collecting ports 2101, which correspond to the second exhaust channels 2120 in space. Figure 4 , each furnace cover unit 210 has a smoke outlet 2100 on the top. Figure 5 As shown, Figure 5 Shown Figure 4 Schematic diagram of a top view of one of the furnace cover units 210, wherein the dotted line portion shows the first exhaust channel 2110 located in the furnace cover unit 210 and the smoke collection port 2101 located at the bottom thereof. The smoke outlet 2100 is connected to the multiple smoke collection ports 2101 through the first exhaust channel 2110. Preferably, the diameter of the smoke outlet 2100 is greater than or equal to the diameter of the smoke collection port 2101, so as to facilitate the collection of smoke from the multiple smoke collection ports 2101 after being collected through the first exhaust channel 2110. For specific reference Figure 2 , the arrows show the flow direction Z of the flue gas in the furnace roof structure 21. It is understood that this application Figures 2 to 5 The number of the smoke outlets 2100 and the smoke collection ports 2101 is for illustration only. This application does not limit the number of the above structures, and in different embodiments, they can be set according to actual production conditions.

[0052] In this embodiment, the furnace cover 211 is made primarily of a high-alumina refractory material, specifically, a high-alumina (Al2O3) refractory castable. To further enhance the reliability of each furnace cover unit 210, a support structure 213 is preferably provided on the top of the furnace cover unit 210. Exemplarily, the support structure 213 may include a ribbed structure or a mesh-like support plate, but this application is not limited thereto. Figure 2 and Figure 3 The thick solid line outside the middle furnace cover 211 represents the support structure 213 .

[0053] In this embodiment, preferably, the furnace roof structure 21 can play a more preferred furnace roof insulation effect for the electric roasting furnace 20. Specifically, the furnace roof material layer 212 in this embodiment also includes a plurality of second-class coke particles, and the particle size of at least some of the second-class coke particles is smaller than the particle size of the first-class coke particles. Exemplarily, the particle size range of the first-class coke particles in the furnace roof material layer 212 is 5mm~8mm, while the corresponding particle size range of the second-class coke particles is 0~2mm. Similar to the first-class coke particles, the second-class coke particles also include calcined petroleum coke particles and / or graphitized coke particles. Preferably, the content of the second-class coke particles with a particle size of less than 0.5mm in the furnace roof material layer 212 is not more than 25%. Such a setting can reduce the risk of dust explosion during the high-temperature manufacturing process of the electric roasting furnace 20.

[0054] In this embodiment, since the distance between the second type coke particles is small, the region containing the second type coke particles in the furnace top material layer 212 forms a heat-insulating material layer 2121. For the sake of simplicity of the drawings, only the heat-insulating material layer 2121 is shown. Figure 3 The number of the insulation material layer 2121 is shown in FIG. Figure 3 The area of ​​the furnace top material layer 212 is not marked in the figure. This part can be combined with Figure 2 for understanding. It should be noted that, when the above structure is shown in a dotted frame, in order to facilitate distinction, the area framed by the dotted line is slightly larger than the actual boundaries of each structural part. Preferably, in order to take into account both the insulation and exhaust functions, in the insulation material layer 2121, the ratio of the first type of coke particles to the second type of coke particles is 1:18~22. Preferably, the ratio can be set to 1:20. In this embodiment, preferably, the thickness of the insulation material layer 2121 in the vertical direction y is 300mm~500mm. Since the particle size range of the second type of coke particles is smaller, the gaps between the particles are smaller, so that the furnace cover 211 can have a better insulation effect on the electric roasting furnace 20 as a whole.

[0055] On the other hand, in order to allow the flue gas to flow out smoothly during the roasting process, the second exhaust channel 2120 formed by the first type of coke particles in the insulation material layer 2121 in this embodiment includes the following: Figure 2 and Figure 3 The columnar structure shown extends in the vertical direction y, and the columnar structure constitutes the first part A of the second exhaust channel 2120; preferably, the diameter of the columnar structure A is 100mm to 500mm. Furthermore, in the furnace top material layer 212, there is a layer of material formed by the first type of coke particles below the insulation material layer 2121, which forms the second part of the second exhaust channel 2120 extending in the horizontal direction x. For the sake of simplicity in the drawings, the above-mentioned reference numerals A and B are only used in the following examples. Figure 3During the operation of the electric roasting furnace 20, the asphalt fume is first transported from the second part B to the first part A and then continues to be collected by the first exhaust channel 2110 to the fume outlet 2100 and then discharged from the electric roasting furnace 20. It should be noted that in some other embodiments of the present application, if the overall insulation effect of the furnace cover 211 is good, the insulation material layer 2121 in this embodiment can be removed. At this time, refer to Figure 2 and Figure 3 The second part B composed of the first type of coke particles located in the bottom area of ​​the furnace top material layer 212 can naturally form a whole layer of second exhaust channel 2120 due to the large gaps between the particles and directly contact the furnace cover 211, thereby connecting with the first exhaust channel 2110 at the position with the flue gas collection port 2101 to discharge the flue gas.

[0056] In this embodiment, reference Figure 3 and Figure 4 The electric roasting furnace 20 further includes furnace head electrodes 24, which are located at both ends of the length direction of the electric roasting furnace 20. Figure 4 The electric roasting furnace 20 further includes a power supply 25 and a wire 26, and the furnace head electrode 24 is suitable for being connected to the power supply 25 via the wire 26. In this embodiment, the electric roasting furnace 20 further includes a product loading area 200, in which a plurality of product blanks 201 are suitable for being placed, wherein the furnace top material layer 212 in the furnace top structure 21 is located above the product loading area 200. Of course, the present application is not limited to what is shown in the figure. In other embodiments of the present application, the number of product blanks 201 in the product loading area 200 may also be less or even one. In this embodiment, preferably, Figure 2 The furnace cover 211 is shown to have a lower surface S facing the product loading area 200. The ratio of the weight of the furnace cover 211 to the area of ​​the lower surface is preferably set to 2 tons to 6 tons per square meter. This allows the product body 201 to be continuously pressurized and baked, thereby improving the quality of the finished product.

[0057] according to Figure 2 and Figure 3 The product loading area 200 further includes a filling material 27, which is suitable for filling the area outside the product blank 201 in the product loading area 200. In this embodiment, preferably, the filling material 27 includes the same first-type coke particles as the top material layer 212 in the furnace top structure 21. The first-type coke particles are configured to generate resistance heat after the product loading area 200 is energized, and the resistance heat is used to heat the product blank 201. In this embodiment, refer to Figure 3 and Figure 4The furnace head electrode 24 is located outside the product loading area 200, thereby supplying power to the product loading area 200. Preferably, this embodiment also has a conductive wall 23, which is also located outside the product loading area 200 and is connected to the furnace head electrode 24. Through such a configuration, the filler material 27 is suitable for being electrically connected to the furnace head electrode 24 through the conductive wall 23. Since the size of the furnace head electrode 24 itself is smaller than that of the product loading area 200, the configuration of the conductive wall 23 can increase the contact area between the filler material 27 and the conductive component, thereby improving the problem of uneven current. In this embodiment, since the electric roasting furnace 20 needs to operate in a high temperature environment (for example, greater than 1200 degrees Celsius), the furnace head electrode 24 and the conductive wall 23 are preferably both composed of a graphite material that can withstand high temperatures, and this application does not limit such graphite materials.

[0058] In this embodiment, preferably, refer to Figure 2 and Figure 3 The electric roasting furnace 20 also includes a furnace bottom material layer 28 located below the product loading area 200. The furnace bottom material layer 28 includes second-class coke particles. As described above, the particle size range of the second-class coke particles is 0-2 mm, and the second-class coke particles include calcined petroleum coke particles and / or graphitized coke particles. In other words, the furnace bottom material layer 28 can be made of the same material as the second-class coke particles used in the insulation material layer 2121 in the furnace top material layer 212. By providing the furnace bottom material layer 28 below the product loading area 200, a better insulation effect can be achieved for the product loading area 200. Preferably, the thickness of the furnace bottom material layer 28 along the vertical direction y is 100 mm to 200 mm.

[0059] In this embodiment, the electric roasting furnace 20 further includes a furnace wall 291. Figure 2 and Figure 3 The product loading area 200 is shown to be at least partially surrounded, for example, surrounded from all sides. In order to better adapt to the deformation of the furnace wall 291 caused by the high temperature environment during the electric roasting process, reference is made to FIG. Figure 2 and Figure 3 In this embodiment, a gap is preferably provided between the furnace cover 211 and the furnace wall 291, and the width of the gap is 30 mm to 50 mm. Furthermore, in order to better provide a supporting effect, the electric roasting furnace 20 in this embodiment further includes a base 292, which is preferably made of concrete. Figure 2 In this embodiment, a plurality of temperature measuring devices 271 are preferably further included, which are located in the filling material 27. During the electric roasting process, each temperature measuring device 271 located in the product loading area 200 can obtain the actual temperature of the filling material 27 at different positions, thereby making it easier to control the roasting temperature and improve the roasting effect and quality.

[0060] In the above embodiment of the present application, by filling the bottom of the product loading area 200 with a certain thickness of second-type coke particles (thickness of about 100mm to 200mm) to form a furnace bottom material layer 28, the furnace bottom portion can be better protected during the roasting process. Based on the second-type coke particles in this furnace bottom material layer 28, the product blank 201 and the first-type coke particles are evenly filled, thereby forming the product loading area 200. It can be understood that Figure 2~Figure 3 As only a preferred embodiment of the present application, it shows an example of a multi-layer product body 201, but the present application is not limited thereto, and in some other embodiments, there may be a smaller number of product bodies 201. Furthermore, after a certain thickness of first-type coke particles is first formed on the product loading area 200, a certain thickness (preferably 300mm to 500mm) of second-type coke particles is continuously laid to form a thermal insulation layer 2121, thereby insulating and protecting the furnace roof structure 21. In the second coke particles, corresponding to the position of the flue gas collection port 2101 of each furnace cover unit 210, a columnar structure formed by the first-type coke particles (that is, as shown in FIG. Figure 3 In the first section A shown, the gaps between the first-type coke particles in the columnar structure serve as channels for the asphalt fume to circulate, connecting the product loading area 200 with the fume collection port 2101 at the bottom of each furnace cover unit 210. If the furnace cover 211 can withstand the high roasting temperatures, the thickness of the insulation layer 2121 in the vertical y-direction can be reduced or even eliminated.

[0061] In the electric roasting furnace 20 of the above-described embodiment of the present application, the product bodies 201 in the product loading area 200 can be sintered at a set pressure. Simultaneously, the generated asphalt volatile gas can flow through the second exhaust channel 2120 provided in the furnace top material layer 212 to the first exhaust channel 2110 in the furnace cover and then be smoothly discharged out of the furnace, without posing a safety hazard. Preferably, the weight of the furnace cover 211, through the insulation layer 2121 (if any) and the filler material 27 surrounding the product bodies 201, exerts a continuous pressure on the product bodies 201 during the roasting process. This offsets the internal-outward expansion force generated by the product bodies 201 when the asphalt fumes are discharged, as well as the thermal expansion force generated by the product bodies 201 when the temperature rises, thereby promoting the rearrangement of particles in the product bodies 201, reducing the possibility of cracking, and increasing the final sintered density of the product, thereby improving the sintering quality.

[0062] Preferably, the products produced by the above-mentioned electric roasting furnace 20 can include carbon products of any type and size. Such carbon products can be further processed into carbon graphite products by undergoing processes such as high-temperature graphitization. The electric roasting scheme of the present application can achieve a more significant and superior improvement in the quality of large-sized carbon and carbon graphite products. For example, such carbon graphite products can be special carbon graphite products, which can be understood as high-quality graphite widely used in high-tech fields such as aerospace, nuclear, semiconductor, and photovoltaic fields. In the present application, the special carbon graphite products produced include isostatically pressed graphite. Further preferably, the carbon products and carbon graphite products produced by the electric roasting scheme of the present application, especially the special carbon graphite products (e.g., isostatically pressed graphite), can be 500 mm or larger in size. This size can be understood as dimensional parameters such as diameter and side length for different product shapes. This achievement achieves larger sizes than the reliable special carbon graphite products that can be produced using the prior art.

[0063] Since the existing technology is relatively difficult to prepare large-sized special carbon graphite products and has a high defective rate, the present application can better improve the yield of large-sized special carbon graphite products. In addition, since the existing technical solutions cannot prepare graphitized products with the above-mentioned excellent characteristics, the technical solution of the present application is used to complete the roasting process of carbon products and carbon graphite products, which can greatly improve the product quality level and yield. For graphite electrodes and graphite cathodes, it is easy to reduce the particle size of the raw materials and increase the amount of asphalt to improve the density, conductivity and service life of the products, and the yield can be greatly improved. For large-scale carbon electrodes, pre-baked anodes, regenerated crucibles and other carbon products that only need to be roasted, it is not difficult to improve the uniformity of quality and the yield. For special carbon graphite products, especially large-scale special carbon graphite products, the significance is even more obvious. Specifically, the prior art has a very low yield rate for products larger than 500 mm. This is due to the use of micron-sized coke particles and high asphalt dosages during production. The asphalt fumes emitted during calcination are uncontrollable and can easily cause cracking in the product body. Taking specialty carbon graphite products as an example, the calcination yield rate for large-scale specialty carbon graphite products is below 50% (calculated by the number of finished products). By adopting the solution of this application, a self-designed exhaust duct within the furnace roof structure directly channels the fumes generated during the production process. Furthermore, top-down pressurized calcination is further optimized. Furthermore, combined with feedback control from temperature measurement equipment, the yield rate can reach over 90%. With the same production input, the product yield rate has a direct impact on manufacturing costs. This application achieves exceptional technical results. Of course, this does not mean that the electric calcination furnace for carbon products of this application can only produce such large-scale specialty carbon graphite products. The electric calcination furnace for carbon products of this application is applicable to carbon products in any graphitization field, such as other general-purpose carbon products. Illustratively, such carbon products may include graphite electrodes, graphite cathodes, prebaked anode materials, regeneration crucibles, and the like.

[0064] The basic concepts have been described above. It will be apparent to those skilled in the art that the above disclosures are merely examples and do not limit the present application. Although not explicitly stated herein, those skilled in the art may make various modifications, improvements, and revisions to the present application. Such modifications, improvements, and revisions are suggested in the present application and remain within the spirit and scope of the exemplary embodiments of the present application.

[0065] At the same time, this application uses specific terms to describe the embodiments of this application. For example, "one embodiment," "an embodiment," and / or "some embodiments" refer to a certain feature, structure, or characteristic related to at least one embodiment of this application. Therefore, it should be emphasized and noted that "one embodiment," "an embodiment," or "an alternative embodiment" mentioned twice or multiple times in different locations in this specification does not necessarily refer to the same embodiment. In addition, certain features, structures, or characteristics in one or more embodiments of this application may be appropriately combined.

[0066] Similarly, it should be noted that, in order to simplify the description of this application and thus facilitate understanding of one or more embodiments of the application, the foregoing description of the embodiments of this application sometimes combines multiple features into a single embodiment, figure, or description thereof. However, this disclosure method does not mean that the subject matter of this application requires more features than those recited in the claims. In fact, the features of an embodiment may be fewer than all the features of the individual embodiments disclosed above.

[0067] In some embodiments, numbers describing the number of components and attributes are used. It should be understood that such numbers used in the description of the embodiments are modified by the modifiers "about", "approximately" or "substantially" in some examples. Unless otherwise stated, "about", "approximately" or "substantially" indicate that the numbers are allowed to vary by ±20%. Accordingly, in some embodiments, the numerical parameters used in the specification and claims are approximate values, which may change according to the required features of the individual embodiments. In some embodiments, the numerical parameters should take into account the specified significant digits and adopt the general method of retaining the number of digits. Although the numerical domains and parameters used to confirm the breadth of their range in some embodiments of the present application are approximate values, in specific embodiments, the settings of such numerical values ​​are as accurate as possible within the feasible range.

[0068] Although the present application has been described with reference to the current specific embodiments, ordinary technicians in this technical field should recognize that the above embodiments are only used to illustrate the present application, and various equivalent changes or substitutions can be made without departing from the spirit of the present application. Therefore, as long as the changes and modifications to the above embodiments are within the scope of the essential spirit of the present application, they will fall within the scope of the claims of the present application.

Claims

1. A roof structure of an electric roasting furnace, characterized in that: include: A furnace cover, wherein the furnace cover has a first exhaust passage running through it; A furnace top material layer is located below the furnace cover, the furnace cover has a lower surface facing the furnace top material layer, the weight of the furnace cover acts on the furnace top material layer, and the ratio of the weight of the furnace cover to the area of ​​the lower surface is 2 tons to 6 tons per square meter. The furnace top material layer includes at least a plurality of first-class coke particles, the particle size of the first-class coke particles ranges from 5 mm to 8 mm, and the first-class coke particles include calcined petroleum coke particles and / or graphitized coke particles, wherein, The first type of coke particles form a second exhaust channel in the furnace top material layer through the spaces between the particles, and the second exhaust channel corresponds to the first exhaust channel in space; The furnace cover includes a plurality of furnace cover units, and the shape of each furnace cover unit includes a square or a rectangle, wherein the distance between each two adjacent furnace cover units is 30 mm to 50 mm.

2. The furnace roof structure according to claim 1, characterized in that: The material of the furnace cover includes high-aluminum refractory material.

3. The furnace roof structure according to claim 1, characterized in that: The top of each furnace cover unit includes a support structure, and the support structure includes reinforcing ribs and / or support plates.

4. The furnace roof structure according to claim 1, characterized in that: The bottom of each furnace cover unit is provided with a plurality of smoke collecting ports, which correspond to the second exhaust channels in space.

5. The furnace roof structure according to claim 4, characterized in that: The top of each furnace cover unit is provided with at least one smoke outlet, and the at least one smoke outlet is connected with the plurality of smoke collecting ports through the first exhaust channel.

6. The furnace roof structure according to claim 5, characterized in that: The diameter of the smoke outlet is greater than or equal to the diameter of the smoke collection port.

7. The furnace roof structure according to any one of claims 1 to 6, characterized in that: The furnace top material layer only includes the plurality of first type coke particles, and the gaps between the plurality of first type coke particles form the second exhaust channel.

8. The furnace roof structure according to any one of claims 1 to 6, characterized in that: The furnace top material layer further includes a plurality of second type coke particles, and the particle size of at least some of the second type coke particles is smaller than the particle size of the first type coke particles.

9. The furnace roof structure according to claim 8, characterized in that: The particle size of the second type of coke particles ranges from 0 to 2 mm, and the second type of coke particles include calcined petroleum coke particles and / or graphitized coke particles.

10. The furnace roof structure according to claim 9, characterized in that: The content of the second type of coke particles in the furnace top material layer having a particle size of less than 0.5 mm is not greater than 25%.

11. The furnace roof structure according to claim 9, characterized in that: The region of the furnace top material layer containing the second type of coke particles forms a thermal insulation material layer, wherein in the thermal insulation material layer, the ratio of the first type of coke particles to the second type of coke particles is 1:18-22.

12. The furnace roof structure according to claim 11, characterized in that: The thickness of the thermal insulation layer is 300 mm to 500 mm.

13. The furnace roof structure according to claim 11, characterized in that: The second exhaust channel formed by the first type coke particles in the thermal insulation material layer includes a columnar structure, and the diameter of the columnar structure is 100 mm to 500 mm.

14. An electric roasting furnace, characterized in that: include: The furnace roof structure according to any one of claims 1 to 13; as well as The main flue is communicated with the first exhaust channel of the furnace cover in the furnace top structure.

15. The electric roasting furnace according to claim 14, characterized in that It also includes a flue gas connecting pipe for connecting the first exhaust channel and the main flue.

16. The electric roasting furnace according to claim 14, characterized in that It also includes furnace head electrodes, which are located at both ends of the length direction of the electric roasting furnace.

17. The electric roasting furnace according to claim 16, characterized in that It also includes a power source and a wire, and the furnace head electrode is suitable for being connected to the power source through the wire.

18. The electric roasting furnace according to any one of claims 14 to 17, characterized in that: The furnace further comprises a product loading area, wherein the product loading area is suitable for placing one or more product blanks, wherein the furnace roof material layer in the furnace roof structure is located above the product loading area.

19. The electric roasting furnace according to claim 18, characterized in that Also included is a filling material suitable for filling the area outside the product body in the product filling area.

20. The electric roasting furnace according to claim 19, wherein The filling material includes first-type coke particles that are the same as the furnace roof material layer in the furnace roof structure. The first-type coke particles are configured to generate resistance heat when the product loading area is energized, and the resistance heat is used to heat the product blank.

21. The electric roasting furnace according to claim 20, characterized in that It also includes a furnace bottom material layer located below the product loading area, and the furnace bottom material layer includes second-type coke particles, wherein the particle size range of the second-type coke particles is 0~2mm, and the second-type coke particles include calcined petroleum coke particles and / or graphitized coke particles.

22. The electric roasting furnace according to claim 21, characterized in that The thickness of the furnace bottom material layer is 100mm~200mm.

23. The electric roasting furnace according to claim 19, wherein It also includes one or more temperature measuring devices located in the filling material.

24. The electric roasting furnace according to claim 18, wherein Also included is a furnace wall at least partially surrounding the product loading area.

25. The electric roasting furnace according to claim 24, characterized in that There is a gap between the furnace cover and the furnace wall, and the width of the gap is 30mm~50mm.

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