Furnace top structure and applicable electric roasting furnace thereof

Abstract

The invention provides a furnace top structure and an applicable electric roasting furnace thereof, and the furnace top structure comprises a furnace cover, a furnace top, a furnace top and a furnace top, the furnace top material layer is located below the furnace cover, the furnace top material layer at least comprises a plurality of first-class coke particles, the particle size range of the first-class coke particles is 5mm-8mm, the first-class coke particles comprise calcined petroleum coke particles and / or graphitized coke particles, the first-class coke particles form a second exhaust channel in the furnace top material layer through gaps among the particles, and the second exhaust channel is communicated with the furnace top material layer. The second exhaust channel and the first exhaust channel correspond to each other in space. According to the furnace top structure and the applicable electric roasting furnace, the yield of carbon products can be increased, and the production cost is reduced.

Description

Technical Field

[0001] This application mainly relates to the field of carbon product baking, and particularly relates to a furnace top structure and an electric baking furnace applicable thereto. Background Art

[0002] In the field of graphitization, for conventional carbon-graphite products, such as large-sized steelmaking electrodes, large-sized aluminum cathodes, etc., the existing sintering methods cannot achieve good effects of improving product quality and reducing costs. Among these conventional carbon products, especially large-sized carbon-graphite products (such as electrodes, anodes, cathodes, crucibles), in order to achieve the goals of improving production quality and reducing production costs, in addition to improving the properties of raw materials, improving the property matching between raw materials, and improving the kneading quality, the quality of sintering is a very important link.

[0003] In addition, in the existing market, special carbon products such as isostatic graphite generally have problems such as low product performance, single variety, and inability to produce ultra-large-sized high-performance isostatic graphite, or the quality level of the produced ultra-large-sized products is low. The main reason is that the baking of isostatic graphite products with large-sized dimensions is difficult, the finished product rate is low, and the manufacturing cost is high. Due to uneven baking quality, secondary cracking is likely to occur during graphitization, and the final total finished product rate after graphitization is less than 40%.

[0004] Therefore, there is an urgent need in this field for a technical solution for improving the sintering quality of graphitized products. Summary of the Invention

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

[0006] To solve the above technical problem, this application provides a furnace top structure of an electric baking furnace, including: a furnace cover, the furnace cover having a through first exhaust passage; a furnace top material layer located below the furnace cover, the furnace top material layer at least including a plurality of first-class coke particles, the particle size range of the first-class coke particles being 5 mm to 8 mm, and the first-class coke particles including calcined petroleum coke particles and / or graphitized coke particles, wherein the first-class coke particles form a second exhaust passage in the furnace top material layer through the inter-particle voids, and the second exhaust passage corresponds to the first exhaust passage 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, the shape of each furnace cover unit including a square or a rectangle, wherein the distance between every two adjacent furnace cover units is 30 mm to 50 mm.

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

[0010] Optionally, the bottom of each of the furnace cover units has a plurality of flue gas collection ports, which are spatially corresponding to the second exhaust passage.

[0011] Optionally, the top of each of the furnace cover units has at least one flue gas outlet, and the at least one flue gas outlet is communicated with the plurality of flue gas collection ports through the first exhaust passage.

[0012] Optionally, the caliber of the flue gas outlet is greater than or equal to the caliber of the flue gas collection port.

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

[0014] Optionally, the furnace top material layer further includes a plurality of second-class coke particles, and at least part of the second-class coke particles have a particle size smaller than that of the first-class coke particles.

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

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

[0017] Optionally, the area with the second-class coke particles in the furnace top material layer forms a heat-insulating material layer. Among them, in the heat-insulating material layer, the ratio of the proportion of the first-class coke particles to the second-class coke particles is 1:18 to 22.

[0018] Optionally, the thickness of the heat-insulating material layer is 300 mm to 500 mm.

[0019] Optionally, the second exhaust passage formed by the first-class coke particles in the heat-insulating material layer includes a columnar structure, and the diameter of the columnar structure is 100 mm to 500 mm.

[0020] On the other hand, the present application also provides an electric roasting furnace, including the furnace top structure according to any embodiment of the present application; and a main flue, which is communicated with the first exhaust passage of the furnace cover in the furnace top structure.

[0021] Optionally, it further includes a flue gas connecting pipe for communicating the first exhaust passage and the main flue.

[0022] Optionally, it further includes furnace head electrodes located at both ends of the electric roasting furnace in the length direction.

[0023] Optionally, it further includes a power source and wires, and the furnace head electrode is adapted to be connected to the power source through the wires.

[0024] Optionally, it further includes a product loading area where one or more green bodies are adapted to be placed, and among them, the 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, and among them, 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 includes a filling material adapted to be filled in the area outside the green bodies in the product loading area.

[0027] Optionally, the filling material includes a first type of coke particles that are the same as the top material layer in the furnace top structure, and the first type of coke particles are configured to generate resistance heat after the product loading area is electrified, and the resistance heat is used to heat the green bodies.

[0028] Optionally, it further includes a bottom material layer located below the product loading area, and the bottom material layer includes a second type of coke particles, and among them, the particle size range of the second type of coke particles is 0 to 2 mm, and the second type of coke particles includes calcined petroleum coke particles and / or graphitized coke particles.

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

[0030] Optionally, it further includes one or more temperature measuring devices located in the filling material.

[0031] Optionally, it further includes a furnace wall that at least partially surrounds 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 with the prior art, the present application has the following advantages: By providing corresponding exhaust channels in the furnace cover and the top material layer, the present application facilitates the collection of the asphalt fumes generated during the roasting of the products, without the need for additional waste gas equipment. On the basis that the furnace cover can achieve a good heat preservation and insulation effect, it can achieve the effect of improving the finished product rate of carbon products at a lower cost. Preferably, smaller-sized coke particles can be used in the top material layer of the furnace to further improve the heat preservation effect; and the pressure range of the furnace cover for the product loading area can be set to achieve the effect of pressure roasting for the green bodies, thereby further improving the finished product rate of carbon products. Description of the Drawings

[0034] The accompanying drawings are provided to provide a further understanding of the present application, and they are incorporated into and constitute a part of the present 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: Figure 1 is a schematic diagram of the top structure of an electric roasting furnace according to an embodiment of the present application; Figure 2 is a cross-sectional view of an electric roasting furnace from a side view according to an embodiment of the present application; Figure 3 is a cross-sectional view of an electric roasting furnace from a front view according to an embodiment of the present application; Figure 4 is a top view schematic diagram of an electric roasting furnace according to an embodiment of the present application; Figure 5 is a schematic diagram of the top view of the furnace cover unit in the top structure of an electric roasting furnace according to an embodiment of the present application. Detailed implementation manners

[0035] To more clearly illustrate the technical solutions of the embodiments of the present application, the accompanying drawings required for the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings in the following description are only some examples or embodiments of the present application. For those of ordinary skill in the art, without creative efforts, the present application can also be applied to other similar scenarios based on these drawings. Unless obvious from the language context or otherwise stated, the same reference numerals in the drawings represent the same structure or operation.

[0036] As shown in the present application and the claims, unless the context clearly indicates an exceptional situation, words such as "a", "an", "one", and / or "the" are not specifically singular and may also include plural. Generally speaking, the terms "comprising" and "including" only indicate the inclusion of the clearly identified steps and elements, and these steps and elements do not constitute an exclusive list. The method or device may also include other steps or elements.

[0037] Unless otherwise specifically stated, the relative arrangements of components and steps, numerical expressions, and numerical values set forth in these embodiments do not limit the scope of this application. At the same time, it should be understood that, for the sake of convenience of description, the sizes of the various parts shown in the drawings are not drawn in actual proportional relationships. Technologies, methods, and devices known to those of ordinary skill in the relevant art may not be discussed in detail, but where appropriate, the said technologies, methods, and devices should be regarded as part of the authorization specification. In all the examples shown and discussed here, any specific value should be construed as merely exemplary and not as a limitation. Therefore, other examples of the exemplary embodiments may have different values. It should be noted that like reference numerals and letters denote like items in the following figures, and thus, once an item is defined in one figure, it does not need to be further discussed in subsequent figures.

[0038] In the description of this application, it should be understood that the orientation or positional relationships indicated by orientation terms such as "front, rear, upper, lower, left, right", "lateral, vertical, perpendicular, horizontal", and "top, bottom", etc. are generally based on the orientation or positional relationships shown in the drawings, and are only for the convenience of describing this application and simplifying the description. Without contrary description, these orientation terms do not indicate and imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and thus should not be construed as limiting the protection scope of this application; the orientation terms "inside, outside" refer to the inside and outside relative to the contour of each component itself.

[0039] For the convenience of description, spatial relative terms such as "above...", "over...", "on the upper surface of...", "above" can be used here to describe the spatial positional relationship of one device or feature shown in the figure with other devices or features. It should be understood that the spatial relative terms are intended to include different orientations in use or operation in addition to the orientation described in the figure of the device. For example, if the device in the drawing is inverted, the device described as "above other devices or structures" or "over other devices or structures" will then be positioned as "below other devices or structures" or "under other devices or structures". Thus, the exemplary term "above..." can include both the orientations of "above..." and "below...". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and corresponding interpretations should be made for the spatial relative descriptions used here.

[0040] In addition, it should be noted that the use of terms such as "first" and "second" to define components is only for the convenience of distinguishing the corresponding components. Without additional statements, the above terms have no special meanings, so they should not be construed as limiting the protection scope of this application. In addition, although the terms used in this application are selected from well-known and commonly used terms, some of the terms mentioned in the specification of this application may be selected by the applicant according to his or her judgment, and their detailed meanings are described in the relevant parts of this description. In addition, it is required to understand this application not only through the actual terms used, but also through the meanings implied by each term.

[0041] It should be understood that when a component is referred to as "on another component", "connected to another component", "coupled to another component" or "in contact with another component", it can be directly on, connected to or coupled to, or in contact with the other component, or there may be an intervening component. In contrast, when a component is referred to as "directly on another component", "directly connected to", "directly coupled to" or "directly in contact with" another component, there is no intervening component. Similarly, when a first component is referred to as "electrically contacting" or "electrically coupled to" a second component, there is an electrical path allowing current to flow between the first component and the second component. The electrical path may include capacitors, coupled inductors and / or other components allowing current to flow, even if there is no direct contact between the conductive components.

[0042] This application refers to Figure 1 A top structure 10 of an electric roasting furnace is proposed. The top structure 10 includes a furnace cover 11, and the furnace cover 11 has a first exhaust passage 110 penetrating therethrough. The top structure 10 further includes a top material layer 12 located below the furnace cover 11. The top material layer 12 at least includes a plurality of first-class coke particles, the particle size range of the first-class coke particles is 5 mm to 8 mm, and the first-class coke particles include calcined petroleum coke particles and / or graphitized coke particles. In particular, a plurality of first-class coke particles form a second exhaust passage 120 in the top material layer 12 through the gaps between the particles. Among them, Figure 1 The dashed rectangular frame only schematically shows the possible shape of the second exhaust passage 120. In actual applications, the second exhaust passage 120 may be embodied as multiple channels, each channel corresponding to the path of the flue gas flow, and finally converging to the first exhaust passage 110 in the furnace cover 11. Such as Figure 1As shown, the second exhaust passage 120 corresponds to the first exhaust passage 110 spatially. In this way, when the furnace top structure 10 is applied to an electric roasting furnace, exhaust gases such as pitch fumes generated during the roasting process can pass through the second exhaust passage 120 and continue to pass through the first exhaust passage 110 and then be discharged outside the furnace cover 11. Specifically, for the electric roasting furnace to which the furnace top structure 10 is applied, the resistance material for high-temperature roasting products can use the same material as the first type of coke particles, and these contents will be described in detail below.

[0043] Based on Figure 1 the embodiment shown, Figures 2 - 4 there is also shown an electric roasting furnace 20 proposed by the present application, which can be applied to the furnace top structure 10 and its preferably variant forms as Figure 1 shown. The following will be described in detail with reference to Figures 2 - 4 this.

[0044] According to Figures 2 - 4 this, the present application proposes an electric roasting furnace 20, wherein Figure 2 FIG. is a cross-sectional view of the electric roasting furnace 20 from a side view perspective, Figure 3 FIG. is a cross-sectional view of the electric roasting furnace 20 from a top view perspective, and Figure 4 FIG. is a top view schematic diagram of the electric roasting furnace 20. Among them, the electric roasting furnace 20 includes the furnace top structure 21 proposed in any embodiment of the present application, and this furnace top structure 21 can be a preferably variant form based on the furnace top structure 10 as Figure 1 shown. Further referring to Figure 4 this, the electric roasting furnace 20 has a main flue 22; further in combination with Figure 2 this, as Figure 4 shown, the main flue 22 is communicated with the first exhaust passage 2110 of the furnace cover 211 in the furnace top structure 21 as Figure 2 shown. Preferably referring to Figure 4 this, the electric roasting furnace 20 further includes a flue gas connecting pipe 221 for communicating the first exhaust passage 2110 and the main flue 22. According to Figure 2 and Figure 3 this, the furnace top structure 21 further has a furnace top material layer 212, and the furnace top material layer 212 is located below the furnace cover 211, and includes a plurality of first type of coke particles, and these first type of coke particles form a second exhaust passage 2120 through the inter-particle voids, and the second exhaust passage 2120 corresponds to the first exhaust passage 2110 spatially.

[0045] Specifically, in this embodiment, Figure 3 and Figure 4 both show that the furnace cover 211 includes a plurality of furnace cover units 210 (wherein 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 a square or a rectangle. Figure 3 It is more clearly shown that in this embodiment, it is preferred to have a spacing between each two adjacent furnace cover units 210, and the spacing is preferably set to 30mm~50mm. By setting the spacing between adjacent furnace cover units, it is possible to better adapt to the thermal expansion deformation that may occur due to high temperature heat during the operation of the electric roasting furnace 20, thereby improving the reliability of the electric roasting process.

[0046] 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 at the top. Figure 5 As shown, Figure 5 Shows 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 collecting port 2101 located at the bottom thereof. The smoke outlet 2100 is connected to the multiple smoke collecting ports 2101 through the first exhaust channel 2110. Preferably, the caliber of the smoke outlet 2100 is greater than or equal to the caliber of the smoke collecting port 2101, so as to facilitate the collection of smoke from the multiple smoke collecting 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 can be understood that the present application Figures 2 - 5 The number of smoke outlets 2100 and smoke collection ports 2101 is for illustration only. The present application does not limit the number of the above structures, and in different embodiments, they can be set according to actual production conditions.

[0047] In this embodiment, the material of the furnace cover 211 includes high-aluminum refractory material, that is, it is mainly made of high-aluminum (Al2O3) refractory castable. In order to further increase the reliability of each furnace cover unit 210, in this embodiment, preferably, a support structure 213 is set on the top of the furnace cover unit 210. Exemplarily, the support structure 213 includes a support plate that may include a reinforcing rib structure or a mesh structure, and this application is not limited to this. Figure 2 and Figure 3 The thick solid line on the outer side of the middle furnace cover 211 represents the support structure 213 .

[0048] Preferably, in this embodiment, the furnace top structure 21 can achieve a more preferable furnace top heat preservation effect for the electric roasting furnace 20. Specifically, the furnace top material layer 212 in this embodiment further includes a plurality of second type coke particles, and at least part of the second type coke particles have a particle size smaller than that of the first type coke particles. Exemplarily, the particle size range of the first type coke particles in the furnace top material layer 212 is 5 mm to 8 mm, while the corresponding particle size range of the second type coke particles is 0 to 2 mm. Similar to the first type coke particles, the second type coke particles also include calcined petroleum coke particles and / or graphitized coke particles. Preferably, the content of the second type coke particles with a particle size of less than 0.5 mm in the furnace top material layer 212 is not more than 25%. By such a setting, the risk of dust explosion during the high-temperature manufacturing process of the electric roasting furnace 20 can be reduced.

[0049] In this embodiment, due to the smaller spacing between the second type coke particles, the area in the furnace top material layer 212 with the second type coke particles forms a heat preservation material layer 2121. For the sake of simplicity of the drawings, only the label of this heat preservation material layer 2121 is shown in Figure 3 and the area of the furnace top material layer 212 is not labeled in Figure 3 which can be understood in combination with Figure 2 . It should be noted that when the above structure is shown by a dashed line frame, for the sake of easy distinction, the area framed by the dashed line is slightly larger than the actual boundary of each structural part. Preferably, in order to balance the heat preservation and exhaust functions, in the heat preservation material layer 2121, the ratio of the first type coke particles to the second type coke particles is 1:18 to 22. Preferably, the ratio can be set to 1:20. Preferably, in this embodiment, the thickness of the heat preservation material layer 2121 in the vertical y direction is 300 mm to 500 mm. Since the particle size range of the second type coke particles is smaller and the voids between the particles are smaller, the heat preservation effect of the furnace cover 211 on the overall electric roasting furnace 20 can be better.

[0050] On the other hand, in order to enable the flue gas during the roasting process to flow out smoothly, the second exhaust channel 2120 formed by the first type coke particles in the heat preservation material layer 2121 includes a columnar structure extending along the vertical y direction as shown in Figure 2 and Figure 3 which constitutes the first part A of the second exhaust channel 2120; preferably, the diameter of the columnar structure A is 100 mm to 500 mm. Further, in the furnace top material layer 212, there is another material layer formed by the first type coke particles under the heat preservation material layer 2121, which forms the second part of the second exhaust channel 2120 extending along the horizontal x direction. For the sake of simplicity of the drawings, the above label A and label B are only shown in Figure 3As shown. During the operation of the electric roasting furnace 20, the pitch fume first converges from the second part B and is transported to the first part A, and then continues to converge through the first exhaust passage 2110 to the flue gas outlet 2100 and is discharged outside the electric roasting furnace 20. It should be noted that in some other embodiments of the present application, if the overall heat preservation effect of the furnace cover 211 is good, the heat preservation material layer 2121 in this embodiment can be removed. At this time, referring 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 has relatively large voids between the particles, and a complete layer of the second exhaust passage 2120 can be naturally formed and directly contact the furnace cover 211, so as to communicate with the first exhaust passage 2110 at the position with the flue gas collection port 2101, so that the flue gas is discharged.

[0051] In this embodiment, referring to Figure 3 and Figure 4 , the electric roasting furnace 20 further includes furnace head electrodes 24, which are located at both ends in the length direction of the electric roasting furnace 20. Further, referring to Figure 4 , the electric roasting furnace 20 further includes a power supply 25 and a wire 26, and the furnace head electrode 24 is adapted to be connected to the power supply 25 through the wire 26. In this embodiment, the electric roasting furnace 20 further includes a product loading area 200, and a plurality of product blanks 201 are adapted to be placed in the product loading area 200. Among them, 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 can also be less or even one. Preferably in this embodiment, Figure 2 shows that the furnace cover 211 has a lower surface S facing the product loading area 200. Among them, 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. In this way, continuous pressure roasting can be carried out on the product blank 201, thereby improving the finished product quality.

[0052] According to Figure 2 and Figure 3 , the product loading area 200 further includes a filling material 27, which is adapted to be filled in the area outside the product blank 201 in the product loading area 200. Preferably in this embodiment, the filling material 27 includes the first type of coke particles that are the same as the furnace top material layer 212 in the furnace top structure 21. The first type of coke particles are configured to generate resistance heat after the product loading area 200 is electrified, and the resistance heat is used to heat the product blank 201. Referring to Figure 3 and Figure 4, the furnace head electrode 24 is located outside the product loading area 200 to supply power to the product loading area 200. Preferably, in this embodiment, there is also 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 setting, the filling material 27 is adapted to be electrically connected between the conductive wall 23 and the furnace head electrode 24. Since the size of the furnace head electrode 24 itself is relatively small compared to the product loading area 200, after configuring the conductive wall 23, the contact area between the filling material 27 and the conductive component can be increased, thereby improving the problem of uneven current. In this embodiment, since the electric roasting furnace 20 needs to work 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 heat-resistant graphite materials, and this application does not limit such graphite materials.

[0053] Preferably in this embodiment, referring to Figure 2 and Figure 3 , the electric roasting furnace 20 further 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. Among them, the same as before, 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. That is, the furnace bottom material layer 28 can use the same material as the second-class coke particles used in the heat preservation material layer 2121 in the furnace top material layer 212. By arranging the furnace bottom material layer 28 below the product loading area 200, a better heat preservation effect can be achieved for the product loading area 200. Preferably, the thickness of the furnace bottom material layer 28 in the vertical y direction is 100 mm - 200 mm.

[0054] In this embodiment, the electric roasting furnace 20 further includes a furnace wall 291, and the furnace wall 291 surrounds at least part of the product loading area 200 through Figure 2 and Figure 3 shown, for example, surrounding the product loading area 200 from all around. In order to better adapt to the deformation of the furnace wall 291 caused by the high-temperature environment during the electric roasting process, referring to Figure 2 and Figure 3 , in this embodiment, it is preferably to set a gap between the furnace cover 211 and the furnace wall 291, and the width of this gap is 30 mm - 50 mm. Further, in order to better play a supporting role, the electric roasting furnace 20 in this embodiment further includes a base 292, and this base 292 is preferably made of concrete material. According to Figure 2 , in this embodiment, it is preferably to further include a plurality of temperature measuring devices 271, 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, so as to more conveniently control the roasting temperature and improve the roasting effect and quality.

[0055] In the above embodiments of the present application, by filling a certain thickness of the second type of coke particles (with a thickness of about 100 mm to 200 mm) at the bottom of the product loading area 200 to form the bottom material layer 28 of the furnace, the bottom part of the furnace can be better protected during the roasting process. Based on the second type of coke particles in the bottom material layer 28 of the furnace, the product blanks 201 and the first type of coke particles are uniformly filled to form the product loading area 200. It can be understood that, Figures 2 - 3 Merely as a preferred embodiment of the present application, it shows an example of multiple layers of product blanks 201, but the present application is not limited thereto, and in some other embodiments, there may be a smaller number of product blanks 201. Further, after first forming a certain thickness of the first type of coke particles on the product loading area 200, a second type of coke particles with a certain thickness (preferably a thickness of 300 mm to 500 mm) is continuously paved to form the heat preservation material layer 2121, so as to insulate and protect the furnace top structure 21. At the position of the flue gas collection port 2101 corresponding to each furnace cover unit 210 in the second coke particles, a columnar structure formed by the first type of coke particles is filled (that is, as Figure 3 shown in the first partial view A), and the gaps between the particles in the first type of coke particles in the columnar structure are regarded as channels for the asphalt flue gas to flow through, so as to connect the product loading area 200 with the flue gas collection port 2101 at the bottom of each furnace cover unit 210. If the furnace cover 211 can withstand the high temperature of roasting, the thickness of the heat preservation material layer 2121 in the vertical direction y can be reduced, or even cancelled.

[0056] For the electric roasting furnace 20 in the above embodiments of the present application, the product blanks 201 in the product loading area 200 can be sintered under a set pressure, and at the same time, 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 outside the furnace, without causing potential safety hazards. Preferably, the weight of the furnace cover 211 gives a continuous pressure to the product blanks 201 during the roasting process through the heat preservation material layer 2121 (if any) and the filling material 27 filled around the product blanks 201, offsetting the expansion force generated from the inside to the outside of the product blanks 201 when discharging the asphalt flue gas, as well as the thermal expansion force generated during its heating, promoting the rearrangement of particles in the product blanks 201, reducing the possibility of cracking, and improving the final sintering density of the product, thereby improving the sintering quality.

[0057] Preferably, the products prepared by the above-mentioned electric roasting furnace 20 may include carbon products of any type and any specification. If such carbon products are further subjected to processes such as high-temperature graphitization treatment, they can be further prepared into carbon-graphite products. Among them, for large-sized carbon products and carbon-graphite products, the electric roasting solution of the present application can achieve more obvious and excellent improvement effects. Exemplarily, such carbon-graphite products can be special carbon-graphite products, which can be understood as high-quality graphite and are widely applicable to high-tech fields such as the aerospace field, nuclear field, semiconductor field, and photovoltaic field. In the present application, the prepared special carbon-graphite products include isostatic graphite. Further preferably, the carbon products and carbon-graphite products prepared by the electric roasting solution of the present application, especially the special carbon-graphite products (such as isostatic graphite) therein, can reach a size of 500 mm or above, and this size can be understood as size parameters such as diameter and side length for products of different shapes. This achievement has a larger size compared to the reliable special carbon-graphite products that can be prepared in the prior art.

[0058] Due to the difficulties in preparing large-sized special carbon graphite products in the prior art and the high defective rate, this application can achieve a better effect of improving the finished product rate for large-sized special carbon graphite products. Moreover, since the prior art solutions are unable to prepare graphitized products with the above excellent properties, therefore, adopting the technical solution of this application to complete the baking process of carbon products and carbon graphite products can significantly improve the product quality level and the finished product rate. Using an electric baking furnace for baking production, for graphite electrodes and graphite cathodes, it becomes easy and feasible to increase the amount of pitch by reducing the particle size of the product raw materials to improve the density, electrical conductivity, and service life of the products, and the finished product rate can also be significantly improved. For carbon products that only need to be baked, such as large-sized carbon electrodes, pre-baked anodes, and recycled crucibles, it becomes easy to improve the quality uniformity and the finished product rate. For special carbon graphite products, especially large-sized special carbon graphite products, the significance is even more obvious. Specifically, in the prior art, the finished product rate of products over 500 mm is very low. Since micron-sized coke particles are used in the production of products and the amount of pitch is high, the pitch fumes discharged during baking are uncontrollable, easily leading to cracking of the product billets. Taking special carbon graphite products as an example, the baking finished product rate of large-sized special carbon graphite products is below 50% (calculated by the number of products). After adopting the solution of this application, first, the self-designed exhaust channels in the furnace top structure can directly discharge the fumes generated during the production process. At the same time, a downward pressure baking is preferably further realized. Additionally, with the feedback adjustment of the temperature measuring equipment, the finished product rate can reach over 90%. With the same production input, the impact of the finished product rate of products on the manufacturing cost is direct. This application has quite excellent technical effects. Of course, this does not mean that the carbon product electric baking furnace of this application can only prepare such large-sized special carbon graphite products. The carbon product electric baking furnace of this application is applicable to carbon products in any graphitization field, such as other general carbon products. Exemplarily, such carbon products can include graphite electrodes, graphite cathodes, pre-baked anode materials, recycled crucibles, and so on.

[0059] The basic concepts have been described above. Obviously, for those skilled in the art, the above application disclosure is only an example and does not constitute a limitation to this application. Although not explicitly stated here, those skilled in the art may make various modifications, improvements, and corrections to this application. Such modifications, improvements, and corrections are proposed in this application, so such modifications, improvements, and corrections still fall within the spirit and scope of the exemplary embodiments of this application.

[0060] Meanwhile, this application uses specific terms to describe the embodiments of this application. For example, "one embodiment", "an embodiment", and / or "some embodiments" mean a certain feature, structure, or characteristic related to at least one embodiment of this application. Therefore, it should be emphasized and noted that the "one embodiment" or "an embodiment" or "an alternative embodiment" mentioned twice or more at different positions 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 can be appropriately combined.

[0061] Similarly, it should be noted that, in order to simplify the description of this application disclosure and thus help the understanding of one or more application embodiments, in the previous description of the embodiments of this application, sometimes multiple features are grouped into one embodiment, drawing, or description thereof. However, this disclosure method does not mean that the features required by the object of this application are more than those mentioned in the claims. In fact, the features of the embodiment are less than all the features of the single embodiment disclosed above.

[0062] In some embodiments, numbers are used to describe components and attribute quantities. It should be understood that such numbers used for embodiment description are, in some examples, modified by the modifiers "about", "approximately", or "substantially". Unless otherwise stated, "about", "approximately", or "substantially" indicate that the said numbers allow a ±20% variation. Accordingly, in some embodiments, the numerical parameters used in the specification and claims are approximate values, and such approximate values can change according to the characteristics required by individual embodiments. In some embodiments, the numerical parameters should consider the specified significant digits and adopt the method of retaining general digits. Although the numerical ranges and parameters used to confirm the scope breadth in some embodiments of this application are approximate values, in specific embodiments, the setting of such numerical values is as precise as possible within the feasible range.

[0063] Although this application has been described with reference to the current specific embodiments, those of ordinary skill in the art should recognize that the above embodiments are only used to illustrate this application, and various equivalent changes or substitutions can be made without departing from the spirit of this application. Therefore, as long as the changes and modifications to the above embodiments are within the scope of the spirit of this application, they will fall within the scope of the claims of this 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, and 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 gaps between the particles, and the second exhaust channel corresponds to the first exhaust channel in space.

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 furnace cover includes a plurality of furnace cover units, each of which has a square or rectangular shape, wherein a distance between each two adjacent furnace cover units is 30 mm to 50 mm.

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

5. The furnace roof structure according to claim 3, 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 passage in space.

6. The furnace roof structure according to claim 5, 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.

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

8. The furnace roof structure according to any one of claims 1 to 7, 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.

9. The furnace roof structure according to any one of claims 1 to 7, characterized in that: The furnace top material layer further includes a plurality of second type coke particles, and at least a portion of the second type coke particles have a particle size smaller than that of the first type coke particles.

10. The furnace roof structure according to claim 9, characterized in that: 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.

11. The furnace roof structure according to claim 10, characterized in that: 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 more than 25%.

12. The furnace roof structure according to claim 10, 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.

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

14. The furnace roof structure according to claim 12, characterized in that: The second exhaust channel formed by the first type of 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.

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

16. The electric roasting furnace according to claim 15, characterized in that: It also includes a smoke connecting pipe for connecting the first exhaust channel and the main smoke duct.

17. The electric roasting furnace according to claim 15, characterized in that: It also includes furnace head electrodes, which are located at both ends of the electric roasting furnace in the length direction.

18. The electric roasting furnace according to claim 17, 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.

19. The electric roasting furnace according to any one of claims 15 to 18, characterized in that: It also includes a product loading area, in which one or more product blanks are placed, wherein the furnace roof material layer in the furnace roof structure is located above the product loading area.

20. The electric roasting furnace according to claim 19, characterized in that The furnace cover has a lower surface facing the product loading area, wherein a ratio of a weight of the furnace cover to an area of ​​the lower surface is 2 tons to 6 tons per square meter.

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

22. The electric roasting furnace according to claim 21, characterized in that The filling material includes first type coke particles which 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 after the product loading area is energized, and the resistance heat is used to heat the product blank.

23. The electric roasting furnace according to claim 22, 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.

24. The electric roasting furnace according to claim 23, characterized in that: The thickness of the furnace bottom material layer is 100 mm to 200 mm.

25. The electric roasting furnace according to claim 21, characterized in that Also included is one or more temperature measuring devices located in the filling material.

26. The electric roasting furnace according to claim 19, characterized in that: Also included is a furnace wall at least partially surrounding the product loading area.

27. The electric roasting furnace according to claim 26, 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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