Assembled sagger structure

Abstract

The assembled sagger structure comprises a sagger body, a sagger cover and an accessory, and the sagger body is composed of an upper sagger body and a lower sagger body which can be separated; the upper bowl body comprises a graphite shell and a partition plate, the graphite shell is cylindrical, ventilation holes are formed in the side wall of the graphite shell, and a thermal buffer interlayer is formed between the partition plate and the graphite shell; the top surface of the upper bowl body is sealed by a box cover, and the bottom surface of the upper bowl body is spliced with the lower bowl body into a whole; the lower bowl body is integrally formed by graphite, the top face of the lower bowl body is matched with the bottom face of the upper bowl body, a bottom lining structural body is arranged on the outer edge of the lower bowl body, a downward-concave splicing groove is formed in the top face of the bottom lining structural body and matched with the staggered step structure of the thermal buffering interlayer, alignment splicing is facilitated, and a plurality of through holes are formed in the annular face of the bottom lining structural body and serve as high-temperature flue gas channels. According to the invention, the thermal efficiency and graphitization quality of the carbon product during graphitization treatment in the Acheson graphitization furnace can be improved, molding and maintenance are convenient, and the production cost and resource consumption can be effectively reduced.

Description

Technical Field

[0001] The invention relates to the field of auxiliary production equipment for carbon products, and in particular to an assembled sagger structure suitable for an Acheson graphitization furnace. Background Art

[0002] At present, there are two main types of graphitization furnaces on the market used to refine graphite negative electrode materials for lithium batteries: tandem furnaces with internal heating design and Acheson graphitization furnaces with external heating design. Compared with tandem furnaces with internal heating design, Acheson graphitization furnaces have long been the preferred thermal equipment for carbon industrial graphitization production companies due to their simple structure and convenient operation.

[0003] Considering that graphite materials have high temperature resistance, excellent thermal conductivity and outstanding thermal shock resistance, the corresponding graphite crucible or graphite sagger is an ideal heating container for the Acheson graphitization furnace. Among them, the crucible structure has limited loading capacity, the thermal insulation performance is not as good as the sagger, and it is mostly a one-time sintering tool, so it is mostly used for small-batch sintering operations; in addition, the graphitization furnace is a high-energy consumption equipment, and the crucible is usually cylindrical. The space between them must be reserved to adapt to the circular shape, which leads to the need to reserve more circular cut space between adjacent crucibles. These spaces need to be filled with a large amount of resistors during the heat treatment process, but this practice not only increases the additional power consumption and reduces the thermal efficiency of the graphitization furnace, but also easily causes uneven temperature distribution in the furnace, thereby affecting the quality of graphitization. The sagger has excellent high temperature resistance, chemical corrosion resistance and thermal stability, and also has the advantages of large filling volume, easy operation and reusability; it can also effectively reduce the amount of resistor filling, reduce unnecessary power consumption, and can be adapted to large-scale production operations. However, the traditional sagger structure has some problems during use. For example, since the sagger is usually made of a single material, its thermal expansion coefficient does not match other components inside the graphitization furnace, which easily generates thermal stress at high temperatures, causing the sagger to deform or even damage. In addition, the traditional sagger has disadvantages such as uneven temperature on the same cross section in the roasting area and large temperature difference on different cross sections, resulting in low quality or uneven performance of the sintered product, affecting the quality of graphitization.

[0004] In view of the above problems, the applicant proposed a sagger for roasting carbon products in a previous application (the authorization announcement number is CN 112304098B, and the structure of the sagger is as follows: Figure 1As shown), it is intended to solve these technical problems. However, the molding difficulty of the sagger in the actual production process is relatively large, especially the sagger body 2. As a carbon structure, the molding process of the sagger body 2 is usually based on the graphite sagger molding process commonly used in the industry, mainly including two methods of mechanical processing and overall compression molding. The mechanical processing first manufactures a whole piece of graphite blank, and then forms it by machining on the basis of the whole piece of graphite blank. However, the disadvantage of this method is that the effective utilization rate of the graphite blank is low, and a large amount of graphite debris and waste will be generated, resulting in a waste of resources; in addition, the thermal buffer cavity 10 in the cone bottom part of the molding sagger body 2 is difficult to process, and there is a problem of low yield rate. Although the overall compression molding process improves the utilization rate of the graphite blank and has a low molding difficulty, its disadvantages are huge equipment investment and cumbersome procedures, resulting in high production costs, and the blank after pressing and forming is prone to cracks during high-temperature sintering, and there is also a problem of low yield rate.

[0005] Therefore, the present invention proposes a new assembled sagger structure, aiming to overcome the deficiencies of the prior art and improve the performance and production efficiency of the sagger. Summary of the invention

[0006] The technical problem solved by the present invention is to provide an assembled sagger structure to solve the defects in the above technical background.

[0007] The technical problem solved by the present invention is achieved by adopting the following technical solutions:

[0008] An assembled sagger structure comprises a sagger body, a sagger cover and accessories, wherein the sagger body consists of a separable upper sagger body and a lower sagger body;

[0009] The upper bowl body includes a graphite shell and a partition. The graphite shell is cylindrical and has a circular or square ring cross section. The graphite shell is machined from a whole piece of graphite blank and has ventilation holes evenly machined on the side wall. The partition is concentrically arranged on the inner side of the graphite shell, and a heat buffer interlayer is separated between the partition and the graphite shell, and the heat buffer interlayer is filled with porous refractory material.

[0010] The thermal buffer interlayer and the partition form a staggered stepped structure on the lower bottom surface of the upper bowl body, and the bottom plane of the partition is located above the bottom plane of the thermal buffer interlayer;

[0011] The top and bottom surfaces of the upper bowl body are both open surfaces, the top open surface is closed by the box cover of matching size, and the bottom open surface is closed by combining and splicing with the lower bowl body;

[0012] The lower bowl body is an integrally molded one-piece graphite structure, and its shape is a hollow cone with a larger top and a smaller bottom; the top surface of the lower bowl body matches the bottom surface of the upper bowl body, and a circle of bottom lining structure is formed on the outer edge of the top surface, the bottom surface of the bottom lining structure is in contact with the inner wall of the cone and is formed as a whole, and the top surface of the bottom lining structure has a width greater than the sum of the thickness of the thermal buffer interlayer and the partition; a concave splicing groove is formed on the top surface of the bottom lining structure, and the concave splicing groove is formed corresponding to the positive projection contour position of the thermal buffer interlayer and the partition, and matches the staggered stepped structure of the lower surface of the thermal buffer interlayer and the partition, so as to facilitate the alignment splicing of the upper bowl body and the lower bowl body;

[0013] A plurality of through holes are evenly formed on the annular surface of the bottom lining structure as high-temperature flue gas passages. The through holes are obliquely arranged along the conical inclined surface of the lower bowl body and connect the hollow cavity of the lower bowl body and the bottom of the heat buffer interlayer.

[0014] As a further limitation, the volume ratio of the volume parts in the upper bowl body and the lower bowl body is controlled between 1:1 and 3:1 to ensure the thermal stability and strength of the overall structure of the sagger.

[0015] As a further limitation, the top surface of the partition is located below the plane of the top surface of the upper bowl body, and the box cover has a staggered covering step matching the top surface of the upper bowl body; after the box cover is covered on the top surface of the upper bowl body, a gap height of 1 / 10 to 1 / 8 of the height of the roasting space is left between the top surface of the partition and the bottom surface of the cover plate, and the minimum value of the gap height is 10 cm;

[0016] The thermal buffer interlayer is sealed below the top plane of the partition plate with a high thermal conductivity filler at the top, and the high thermal conductivity filler is one or a combination of aluminum silicate fiber, ceramic fiber, refractory brick, refractory mud, and rock wool.

[0017] As a further limitation, the ventilation holes processed on the surface of the graphite shell are circular holes with a diameter of 5 to 30 mm, and the diameter of the ventilation holes uniformly processed on the shell surface at the lower position is smaller than the diameter of the ventilation holes at the upper position.

[0018] As a further limitation, the porosity of the porous refractory material is 30% to 40%.

[0019] As a further limitation, the thickness ratio of the graphite shell to the heat buffer interlayer in the upper bowl is between 1:1 and 1:3, and the thickness of the partition will not exceed half of the thickness of the graphite shell.

[0020] As a further limitation, matching protrusions and grooves are formed on the bottom of the thermal buffer interlayer and the bottom surface of the concave splicing groove of the bottom lining structure. The combination of the protrusions and grooves is used for the alignment splicing of the upper bowl body and the lower bowl body.

[0021] As a further limitation, the accessories include a structural support for standing and holding the lower bowl body, a placement plate for placing materials in the sagger, and a positioning pad placed on the placement plate for positioning the carbon product to be processed.

[0022] Beneficial effects: The assembled sagger structure of the present invention adopts an assembled design, and the graphite shell of the upper sagger body and the lower sagger body are manufactured respectively by mechanical processing and integral pressing, which effectively solves the problems of high molding difficulty, serious waste of resources, and low yield rate faced by the traditional sagger structure in the overall production process. Thanks to the independent molding design of the upper sagger body and the lower sagger body, the production process is significantly simplified, the molding difficulty is reduced, the production cost is reduced, the efficiency is improved, and the repair and maintenance work also becomes more convenient.

[0023] The staggered stepped structural design of the upper and lower sagger bodies ensures that the assembled sagger maintains structural stability during high-temperature sintering, effectively avoiding the generation and development of cracks.

[0024] The multi-combination layer structure of the upper sagger body can not only effectively reduce thermal stress, reduce deformation and damage of the sagger at high temperature, but also improve the temperature uniformity inside the sagger, thereby improving the quality and performance consistency of graphitized products.

[0025] By using porous refractory materials to fill the heat buffer interlayer and controlling the escape and release of volatile gas components in conjunction with the optimized ventilation holes and high-temperature flue gas channel design, thermal stress can be effectively reduced, the thermal stability of the sagger can be enhanced, and good gas exchange capacity can be ensured during the sintering process. At the same time, the adverse effects of thermal stress on the sagger structure are reduced, which is beneficial to improving the comprehensive service life of the sagger. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a schematic diagram of the sagger structure of the prior art.

[0027] Figure 2 The figure is a schematic diagram of the sagger structure of a preferred embodiment of the present invention.

[0028] Among them: 1. sagger cover; 2. sagger body; 3. porous refractory filling material; 4. ventilation holes; 5. partition; 6. roasting space; 7. positioning pad; 8. storage plate; 9. bracket; 10. heat buffer cavity; 11. refractory lining block; 12. heat conduction groove; 13. high thermal conductivity filler; 14. graphite shell; 15. bottom lining structure; 16. high-temperature flue gas channel; 17. lower bowl body. DETAILED DESCRIPTION

[0029] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0030] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0031] See also Figure 2 A preferred embodiment of an assembled sagger structure, in which the technical solution of the assembled sagger structure in this embodiment is to Figure 1 Invention patent corresponding to the embodiment: Further improvement of a sagger for roasting carbon products (patent number: ZL202011196337.6). The technical improvement makes the sagger with the corresponding cone-bottom heat buffer chamber 10 structure easier to form, improves the yield and reduces the preparation cost, while meeting the needs of large-scale production. In addition, when this improved sagger is used in an Acheson graphitization furnace, it can improve the temperature distribution inside the sagger, reduce the difference in graphitization quality caused by uneven temperature, ensure the uniformity of the graphitization process, and thus improve the quality of the graphitized product. In addition, the structural design also allows for rapid replacement or maintenance of the sagger according to actual needs during use, significantly improving production efficiency and equipment reliability.

[0032] The assembled sagger structure comprises a sagger body, a sagger cover 1 and accessories. In different embodiments, the cross-section of the sagger body may be circular or square, which may be selected according to actual production requirements.

[0033] In this embodiment, the sagger body is composed of a separable upper sagger body and a lower sagger body 17, wherein the upper sagger body includes a graphite shell 14 and a partition 5, wherein the graphite shell 14 is a hollow cylindrical shape as a whole, and the cross-section of the graphite shell 14 can be selected as a circular ring or a square ring according to the cross-sectional shape of the sagger body; and the lower sagger body 17 is an integrated graphite structure manufactured by an integral molding process.

[0034] The inner volume space of the upper bowl body is the roasting space 6, and the inner volume space of the lower bowl body 17 is the heat buffer chamber 10. Experiments have shown that when the volume ratio of the roasting space 6 to the heat buffer chamber 10 is controlled between 1:1 and 3:1, the thermal stability and strength of the overall structure of the sagger are in a better state, and when the volume ratio of the roasting space 6 to the heat buffer chamber 10 is controlled at 2.25:1, the thermal stability and strength of the overall structure of the sagger are best.

[0035] In this embodiment, the graphite shell 14 is formed by machining a whole block of graphite blank. Specifically, a graphite blank slightly larger than the graphite shell 14 is selected for top surface cutting. After the corresponding shell blank is cut, the ventilation holes 4 are uniformly processed on the side wall of the shell blank. In this embodiment, the ventilation holes 4 are replaced with circular holes with better processing performance and stability. At the same time, the aperture of these circular holes is 5 to 30 mm, and the aperture of the ventilation holes 4 at the bottom of these ventilation holes 4 is smaller than the aperture of the ventilation holes 4 at the top. These ventilation holes 4 not only serve as ventilation channels, which are helpful for gas exchange inside the sagger, but also promote the discharge of volatile gases during the sintering process, thereby reducing the internal pressure and preventing the sagger from being damaged due to excessive internal pressure. After the graphite shell blank with ventilation holes 4 is processed, it is further finely processed by mechanical processing equipment to ensure the dimensional accuracy and surface finish of the graphite shell 14.

[0036] The intermediate material block cut out during the top surface cutting process is equivalent to only peeling off a layer of the outer skin after the shell blank is cut out, and it still has a relatively complete size. Therefore, the remaining material still has better secondary processing performance and can be used to process smaller graphite shells 14 or other graphite products. Compared with other types of irregularly shaped remaining materials, it has a higher material utilization rate.

[0037] The partition 5 is concentrically arranged on the inner side of the graphite shell 14 to separate an interlayer space between the partition 5 and the graphite shell 14 as a thermal buffer interlayer. In order to achieve its thermal buffer function, the thermal buffer interlayer is uniformly filled with porous refractory filling material 3. The porosity of the porous refractory filling material 3 is 30% to 40%. The porous refractory filling material 3 can be formed by high-temperature resistant filling materials with good high-temperature resistance that are already available in the prior art.

[0038] In this embodiment, the thickness ratio of the graphite shell 14 in the upper sagger body to the heat buffer interlayer should be maintained in the range of 1:1 to 1:3, and the thickness of the partition 5 should not exceed half of the thickness of the graphite shell 14. Such a thickness design ensures that the heat buffer interlayer achieves the best effect in absorbing and dispersing heat by using the porous refractory filling material 3 filled therein, while maintaining the stability of the overall structure of the upper sagger body, which not only ensures that the sagger has sufficient mechanical strength in the face of high temperature environment and chemical corrosion, but also ensures its own good physical structural stability.

[0039] At the top position in the upper bowl body, the top surface plane of the partition 5 is designed to be lower than the top surface plane of the graphite shell 14, thereby forming a dislocated step surface. Correspondingly, the outer edge of the box cover 1 is also equipped with a dislocated cover step that matches the top surface of the graphite shell 14. When the box cover 1 is tightly covered with the top surface of the upper bowl body, a height difference gap will be formed between the top surface of the partition 5 and the bottom surface of the box cover 1. This gap is set to 1 / 10 to 1 / 8 of the height of the roasting space, and the minimum height shall not be less than 10 cm. Such a structural design plays a key role in the graphitization process, which allows auxiliary pressure relief through the height difference gap on the upper part of the partition 5. This design effectively prevents the excessive gas pressure generated when there are too many volatile substances, thereby avoiding the situation where the gas pressure pushes open the box cover 1, and also prevents the carbon material to be heat treated or the partition 5 from plastic deformation due to excessive internal gas pressure.

[0040] In practical applications, it is considered that the refractory lining block 11 may collapse and deform due to the combined effect of volatile substances and thermal stress. Therefore, the refractory lining block 11 must have a certain thermal expansion coefficient. In addition, Figure 1 As shown, a high thermal conductivity filler 13 can be used to fill and seal the top surface of the refractory liner 11, corresponding to the position of the partition 5. These high thermal conductivity fillers 13 can be one or a combination of aluminum silicate fibers, ceramic fibers, refractory bricks, refractory mud, and rock wool, and are sealed below the top surface plane of the partition 5 to adapt to the temperature fluctuations in the graphitization furnace and reduce the influence of thermal stress on the overall structural stability of the upper bowl.

[0041] At the bottom position in the upper bowl body, the lower bottom surface of the porous refractory filling material 3 in the thermal buffer interlayer and the lower bottom surface of the partition 5 as a whole form a staggered stepped structure with low inside and high outside (the bottom surface of the partition 5 on the side inside the cavity is low, and the bottom surface of the porous refractory filling material 3 on the side outside the cavity is high).

[0042] like Figure 1As shown, the lower bowl body 17 in this embodiment presents a hollow inverted cone structure that is wide at the top and narrow at the bottom, and the overall molding process adopted ensures the integrity and strength of the cone structure. The top of the lower bowl body 17 is designed with a connection structure that matches the bottom of the upper bowl body. Specifically, the top of the lower bowl body 17 matches the bottom of the upper bowl body, and a circle of bottom lining structure 15 is formed at the top edge of the lower bowl body 17. The bottom of the bottom lining structure 15 is in close contact with the conical inner wall and is integrated with it, and its top width exceeds the total thickness of the thermal buffer interlayer and the partition 5. On the top surface of the bottom lining structure 15, a concave splicing groove is designed, which is adapted to the staggered stepped structure of the porous refractory filling material 3 and the partition 5, so that the lower bowl body 17 can be realized at the top and the bottom of the upper bowl body. Figure 1 Precise docking as shown.

[0043] In another embodiment, in order to further improve the matching performance of the upper sagger body and the lower sagger body 17, matching protrusions and grooves can be formed on the bottom of the porous refractory filling material in the thermal buffer interlayer and the bottom surface of the concave splicing groove of the bottom lining structure 15. The combination of these protrusions and grooves can further optimize the precise alignment and splicing of the upper sagger body and the lower sagger body 17, ensure that the assembled sagger structure remains stable during the high-temperature sintering process due to the principle of thermal expansion and contraction of the structure, ensure that the sagger will not be misaligned or deformed during the high-temperature sintering process, and can also help improve the sealing performance of the splicing position.

[0044] There are multiple through holes evenly distributed on the annular surface of the bottom lining structure 15 as high-temperature flue gas channels 16. These high-temperature flue gas channels 16 are obliquely arranged along the conical inclined surface of the lower bowl body 17, and are connected to the heat buffer cavity 10 of the lower bowl body 17 and the bottom of the heat buffer interlayer at both ends. The design of the high-temperature flue gas channel 16 allows the high-temperature flue gas generated inside the sagger to pass smoothly, thereby improving the heat exchange efficiency. These high-temperature flue gas channels 16 not only contribute to the discharge of flue gas, but also can adjust the temperature distribution inside the sagger to a certain extent, ensuring the uniformity of the sintering process. In addition, the inclined configuration of the high-temperature flue gas channel 16 significantly reduces the direct impact of the flue gas flow on the sagger structure, and effectively solves the problems of reduced mechanical strength and easy deformation and damage caused by the hole making or split detachable structure of the traditional split sagger, which not only improves the actual reuse rate of the sagger, but also significantly extends its service life.

[0045] In this embodiment, the use of the sagger first needs to be positioned at the center of the lower bowl body 17 through the bottom lining structure 15, and then the placement plate 8 is placed and fixed; then, a positioning pad 7 for placing the carbon product to be processed is set at the center of the placement plate 8, and then the upper bowl body and the lower bowl body 17 are placed as shown in the figure. Figure 1The styles shown are spliced ​​together, and after the splicing is completed, a refractory lining block 11 is used to support the bottom surface and fix the position to ensure the stability and levelness of the sagger body 2 when it is placed on the trolley. At this time, the upper part of the placement plate 8 and the inner side of the partition 5 form a roasting space, and the evenly distributed pores on the placement plate 8 are connected to the heat buffer chamber 10.

[0046] When performing the graphitization process, it is only necessary to fix the carbon product to be treated on the positioning pad 7. During the roasting process, the heat buffer chamber 10 can form a thermal stress buffer zone, so that the temperature difference section moves down to the heat buffer chamber 10. The conical bottom structure of the heat buffer chamber 10, which is larger at the top and smaller at the bottom, can effectively reduce the temperature difference fluctuation in the roasting space. During the graphitization process, the combination of the sandwich structure and the porous refractory filling material 3 can form an insulation layer on the outside of the roasting space. In addition, the porous refractory filling material 3 with a specific porosity can form an exhaust and pressure relief passage with the high-temperature flue gas channel 16 and the ventilation hole 4, and can discharge the excess volatile substances generated during the roasting process from the ventilation hole 4 through the gaps in the porous refractory filling material 3 without affecting the temperature of the roasting space.

[0047] The above shows and describes the basic principles, main features and advantages of the present invention. It should be understood by those skilled in the art that the present invention is not limited to the above embodiments, and the above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention to be protected. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. An assembled sagger structure, characterized in that: The sagger comprises a sagger body, a sagger cover and accessories, wherein the sagger body is composed of a separable upper sagger body and a lower sagger body; The upper bowl body includes a graphite shell and a partition. The graphite shell is cylindrical and has a circular or square ring cross section. The graphite shell is machined from a whole piece of graphite blank and has ventilation holes evenly machined on the side wall. The partition is concentrically arranged on the inner side of the graphite shell, and a heat buffer interlayer is separated between the partition and the graphite shell, and the heat buffer interlayer is filled with porous refractory material. The thermal buffer interlayer and the partition form a staggered stepped structure on the lower bottom surface of the upper bowl body, and the bottom plane of the partition is located above the bottom plane of the thermal buffer interlayer; The top and bottom surfaces of the upper bowl body are both open surfaces, the top open surface is closed by the box cover of matching size, and the bottom open surface is closed by combining and splicing with the lower bowl body; The lower bowl body is an integrally molded one-piece graphite structure, and its shape is a hollow cone with a larger upper part and a smaller lower part; the top surface of the lower bowl body matches the bottom surface of the upper bowl body, and a circle of bottom lining structure is formed on the outer edge of the top surface, the bottom surface of the bottom lining structure is in contact with the inner wall of the cone and formed as a whole, and the top surface of the bottom lining structure has a width greater than the sum of the thickness of the thermal buffer interlayer and the partition; a concave splicing groove is formed on the top surface of the bottom lining structure, and the concave splicing groove is formed corresponding to the positive projection contour position of the thermal buffer interlayer and the partition, and matches the staggered stepped structure of the lower surface of the thermal buffer interlayer and the partition, so as to facilitate the alignment splicing of the upper bowl body and the lower bowl body; A plurality of through holes are evenly formed on the annular surface of the bottom lining structure as high-temperature flue gas passages. The through holes are obliquely arranged along the conical inclined surface of the lower bowl body and connect the hollow cavity of the lower bowl body and the bottom of the heat buffer interlayer.

2. The assembled sagger structure according to claim 1, characterized in that: The volume ratio of the volume parts in the upper bowl body and the lower bowl body is controlled between 1:1 and 3:

1.

3. The assembled sagger structure according to claim 1, characterized in that: The top surface of the partition is located below the plane of the top surface of the upper bowl body, and the box cover has an offset covering step that matches the top surface of the upper bowl body; after the box cover is covered on the top surface of the upper bowl body, a gap height of 1 / 10 to 1 / 8 of the height of the roasting space is left between the top surface of the partition and the bottom surface of the cover plate, and the minimum value of the gap height is 10 cm.

4. The assembled sagger structure according to claim 3, characterized in that: The thermal buffer interlayer is sealed below the top plane of the partition plate with a high thermal conductivity filler at the top, and the high thermal conductivity filler is one or a combination of aluminum silicate fiber, ceramic fiber, refractory brick, refractory mud, and rock wool.

5. The assembled sagger structure according to claim 1, characterized in that: The ventilation holes processed on the surface of the graphite shell are circular holes with a diameter of 5 to 30 mm, and the diameter of the ventilation holes at the lower position among the ventilation holes evenly processed on the shell surface is smaller than the diameter of the ventilation holes at the upper position.

6. The assembled sagger structure according to claim 1, characterized in that: The porosity of the porous refractory material is 30% to 40%.

7. The assembled sagger structure according to claim 1, characterized in that: The thickness ratio of the graphite shell to the heat buffer interlayer in the upper bowl is between 1:1 and 1:3, and the thickness of the partition will not exceed half of the thickness of the graphite shell.

8. The assembled sagger structure according to claim 1, characterized in that: Matching protrusions and grooves are formed on the bottom of the thermal buffer interlayer and the bottom surface of the concave splicing groove of the bottom lining structure. The combination of the protrusion and the groove is used for the alignment splicing of the upper bowl body and the lower bowl body.

9. The assembled sagger structure according to claim 1, characterized in that: The accessories include a structural support for standing and holding the lower bowl body, a placement plate for placing materials in the sagger, and a positioning pad placed on the placement plate for positioning the carbon product to be processed.

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