Roasting furnace for preparing carbon products

Abstract

The invention discloses a roasting furnace for carbon product preparation, which comprises a roasting furnace body, and the roasting furnace body is of a horizontal furnace body structure and comprises half furnace bodies on two sides and a splicing unit; each half furnace body comprises a carbon steel shell and a refractory material inner layer; each splicing unit comprises a carbon steel shell plate frame matched with the open face of the corresponding half furnace body, each carbon steel shell plate frame is provided with a T-shaped section, a wing plate of each T-shaped section faces outwards, and refractory material blocks are formed on the two sides of a web. A leveling filler layer is formed on the surface of the refractory material block; splicing structures are formed on the two side faces of the splicing units and the side faces of the half furnace bodies. According to the roasting furnace body, the shell of the roasting furnace is formed by combining and splicing the multiple continuous splicing units between the two half furnace bodies, the length size of the roasting cavity is controlled by controlling the number of the connected splicing units, and then the length size of the roasting cavity is adjusted. The method has the remarkable beneficial effects of improving the production efficiency, reducing the energy consumption and improving the product quality.

Description

Technical Field

[0001] The invention relates to the technical field of high-temperature treatment of graphite products, and in particular to a roasting furnace with a variable roasting chamber for preparing carbon products. Background Art

[0002] Carbon graphite products are a kind of non-metallic material composed of carbon elements, which have good electrical conductivity, thermal conductivity, high temperature resistance, corrosion resistance, self-lubrication and other characteristics. It is widely used in metallurgy, machinery, electronics, chemical industry, nuclear energy, aerospace and other fields.

[0003] Carbon graphite products mainly include two categories: natural graphite and artificial graphite. Among them, artificial graphite is made by heat treating carbon raw materials (such as coke, asphalt, carbon black, etc.) at high temperatures; its production process includes key steps such as raw material preparation, kneading, pressing, roasting, graphitization treatment and mechanical processing. For some high-quality product raw materials that require impregnation treatment, an additional secondary roasting step may be required. Its roasting step and roasting step are to heat treat the formed carbon material at high temperature to remove volatile substances and fixed carbon content in preparation for graphitization treatment, while graphitization treatment is to transform the crystal structure of the carbon material into a stable graphite structure through a specific heat treatment process at a higher temperature, thereby giving the product excellent electrical and thermal conductivity. Roasting, secondary roasting and graphitization are typical high-energy consumption processes, and their energy consumption and production efficiency are directly related to the cost and quality of carbon products.

[0004] Traditional roasting furnaces are usually equipped with a fixed-size sintering chamber. This design limits the adjustability of the roasting chamber, thus affecting its ability to handle carbon products of various sizes and shapes. Usually, the furnace chamber is designed according to the size and quantity requirements of the carbon products, which not only leads to an increase in floor space, but also makes it difficult to adapt to different types and sizes of carbon raw materials during the roasting and graphitization process, resulting in low thermal efficiency and energy waste. In addition, the fixed nature of the roasting chamber also limits the flexibility of the production process. When it is necessary to produce carbon products of different specifications, the roasting chamber must be replaced or modified. Otherwise, during the roasting process, the uneven temperature distribution in the furnace may cause the roasted products to shrink inconsistently at a certain stage, or even oxidize and crack, which ultimately leads to increased production costs and waste of raw materials for the enterprise. This not only increases production costs and time, but also limits the improvement of production efficiency and product quality.

[0005] Therefore, the present invention proposes a roasting furnace with a variable roasting chamber, aiming to solve the above problems and improve the applicability and production efficiency of the roasting furnace. Summary of the invention

[0006] The technical problem solved by the present invention is to provide a roasting furnace for preparing carbon products, which can be used to solve the shortcomings of the above-mentioned background technology.

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

[0008] A roasting furnace for preparing carbon products, comprising a roasting furnace body, wherein the roasting furnace body is a horizontal furnace body structure, including half furnace bodies on both sides and a splicing unit;

[0009] The half furnace body comprises a carbon steel shell and a refractory inner layer formed inside the carbon steel shell. The roasting furnace body has a discharge port connected to the roasting chamber and a gas introduction and exhaust system for adjusting the atmosphere in the roasting chamber on the surface of the half furnace body on one side.

[0010] The splicing unit comprises a carbon steel outer shell frame matching the open surface of the half furnace body, the carbon steel outer shell frame having a T-shaped cross section, the wing plate of the T-shaped cross section facing outward, refractory material blocks formed on both sides of the web, the refractory material blocks having the same thickness as the refractory material inner layer of the half furnace body; a leveling filler layer is formed on the surface of the refractory material block, and the leveling filler layer has a thermal conductivity greater than that of the refractory material block;

[0011] The splicing units are formed with matching plug-in structures as splicing structures on both side surfaces of the refractory material block and on the inner layer side surface of the refractory material on the open side of the half furnace body; the roasting furnace body is formed by combining and splicing a plurality of continuous splicing units between the two half furnace bodies to form the outer shell of the roasting furnace, and the length dimension of the roasting cavity is controlled by controlling the number of connected splicing units, thereby adjusting the length dimension of the roasting cavity.

[0012] As a further limitation, the roasting furnace is further provided with a bottom lining in the roasting chamber, the bottom lining is paved with refractory bricks, matches the length of the roasting chamber, and side guards are formed on both sides of the bottom lining; the roasting chamber uses the area enclosed by the side guards on both sides and the bottom lining as the stacking area of ​​the carbon material to be processed;

[0013] The roasting furnace is provided with a gas-fired heating interlayer in the space area inside the splicing unit and outside the side baffle;

[0014] The bottom of the substrate is evenly formed with through holes as high-temperature flue gas channels; at the same time, a thermally conductive buffer layer is laid in the stacking area of ​​the carbon material to be processed, and the thermally conductive buffer layer is formed by a metallurgical coke particle layer. The particle size of the metallurgical coke is 30mm to 80mm, and the particle size of the metallurgical coke decreases continuously from the surface of the substrate upward.

[0015] As a further limitation, a slide is provided at the bottom of the setting position of the roasting furnace body, and the half furnace body and all the splicing units on the upper month are arranged on the slide structure, and the position can be adjusted and the splicing units can be removed / added through the slide.

[0016] As a further limitation, the roasting furnace further comprises a heating device for heating the carbon material in the roasting chamber, the heating device comprises a plurality of heating elements, the heating elements are natural gas heating elements or electric heating elements or a combination of the two; the heating elements are evenly distributed around the roasting chamber;

[0017] The roasting furnace also includes a temperature control system, which is a combination of a temperature sensor and a heating element control unit.

[0018] As a further limitation, the refractory material inner layer and the refractory material block are formed of the same material, and the refractory material block is foamed to reduce its density and weight.

[0019] As a further limitation, the leveling filler layer formed on the surface of the refractory material block uses one or a combination of aluminum silicate fiber, ceramic fiber, refractory brick, refractory mud, and rock wool as the filler material.

[0020] As a further limitation, the carbon steel shell plate frame is formed with anchoring protrusion structures on the inner side of the wing plate of the T-section and on both sides of the web plate to improve the stability of the refractory material blocks attached to the carbon steel shell plate frame.

[0021] Beneficial effects: The roasting furnace for preparing carbon products of the present invention has a variable roasting chamber design, which enables the roasting furnace to adapt to carbon products of different sizes and shapes, thereby improving thermal efficiency and energy utilization; by adjusting the length of the roasting chamber, it can flexibly respond to production needs of different specifications, reducing the low thermal efficiency and energy waste caused by mismatching processing quantity and size.

[0022] In addition, the roaster’s spliced ​​unit design allows for quick replacement and adjustment to suit different production tasks, improving the flexibility and efficiency of the production process.

[0023] The heating device and temperature control system of the roasting furnace ensure the temperature uniformity of the roasting process, effectively preventing the inconsistent shrinkage or oxidation cracking of the roasted products during the roasting process, thereby improving the quality of the products and production efficiency; the use of a leveling filler layer with better thermal conductivity further optimizes the heat transfer efficiency and ensures the uniformity of the roasting process. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic diagram of a preferred embodiment of the present invention.

[0025] Figure 2 for Figure 1 Side view of the middle splicing unit.

[0026] Figure 3 for Figure 1 Schematic diagram of the cross-section of the splicing unit.

[0027] In the figure: 1. rear half of the furnace body; 2. splicing unit; 3. exhaust pressure regulating seat; 4. front half of the furnace body; 5. furnace door; 6. structural base; 7. roasting chamber; 8. filler; 9. carbon product; 10. side baffle; 11. carbon steel shell plate frame; 12. refractory material block; 13. plug-in slot; 14. leveling filler layer; 15. slideway; 16. thermal conductive buffer layer; 17. bottom lining; 18. high-temperature flue gas channel; 19. plug-in block; 20. triangular reinforcing rib. DETAILED DESCRIPTION

[0028] 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.

[0029] 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.

[0030] See also Figure 1 A preferred embodiment of a roasting furnace for preparing carbon products is provided. In this embodiment, the roasting furnace can be used for the primary roasting operation and the secondary roasting operation of the carbon product 9, and is used for roasting different types of carbon materials.

[0031] The roasting furnace is integrally formed on a preformed structural base 6, which can be a concrete structure to provide sufficient supporting strength and stability; it can also be a metal structure and structurally fixed to the concrete floor through embedded parts to ensure the lightness and ease of movement of the roasting furnace.

[0032] The roasting furnace includes a temperature control system and a roasting furnace body. The temperature control system is a combination of a temperature sensor and a heating element control unit, and is executed by a commercially available mature control chip in the art to accurately control the temperature distribution in the roasting chamber. The roasting furnace body is composed of a rear half furnace body 1, a front half furnace body 4, and a plurality of splicing units 2. The rear half furnace body 1 is arranged at the rear of the furnace body during molding, with the front side open and the rear side closed; and the front half furnace body 4 is arranged at the front of the furnace body during molding, with the rear side open, and the front side opening is used as a discharge port, and the discharge port is closed by a furnace door 5 with a hinge structure. The front half furnace body 4 and the rear half furnace body 1 are connected by a plurality of splicing units 2 to form a closed roasting chamber 7. The inner middle area of ​​the roasting chamber 7 is used to place the carbon product 9 to be roasted, and the outer side of the carbon product placement area is arranged with a heating unit. The arrangement of the heating unit adopts the existing and mature roasting furnace heating unit arrangement scheme in the prior art, and the corresponding heating unit can be a natural gas heating element or an electric heating element or a combination of the two.

[0033] The length of the roasting chamber 7 can be flexibly adjusted according to demand. This adjustment process is completed by moving and increasing or decreasing the splicing units 2. Therefore, the splicing units 2 can be set to be multiple. For example, in the present embodiment, the number of splicing units 2 is seven. If the roasting chamber 7 needs to be shortened to reduce its size, the number of splicing units 2 can be reduced; conversely, if the length of the roasting chamber 7 needs to be extended, the number of splicing units 2 can be increased. This design enables the length of the roasting chamber 7 to be flexibly changed according to production needs. After adjusting the length of the roasting chamber 7, it can adapt to carbon products 9 of different sizes, thereby improving thermal efficiency and energy utilization.

[0034] The movement, removal and addition of the splicing unit 2 are achieved through a slide 15 arranged at the bottom of the splicing unit 2 and a sliding structure matching the slide 15; the sliding structure can be a roller, a slide rail or other suitable mechanical device to ensure that the splicing unit 2 can move smoothly on the slide 15 while maintaining the sealing of the roasting chamber 7; and the corresponding slide 15 is embedded in the structural base 6 to provide necessary guidance and support.

[0035] In this embodiment, the corresponding furnace shell structure of the rear half furnace body 1 and the front half furnace body 4 is formed by a carbon steel shell, and a refractory inner layer is arranged on the inner side of the carbon steel shell. The front half furnace body 4 is further equipped with a gas introduction and exhaust system for adjusting the atmosphere in the roasting chamber. The system can be selected according to actual needs and the mature gas adjustment schemes in the prior art. In this embodiment, this system is specifically embodied in the exhaust pressure regulating seat 3 provided on the structure of the front half furnace body 4.

[0036] In this embodiment, the structure of the splicing unit 2 is as follows: Figure 2 , Figure 3As shown, it is presented as a semi-rectangular frame with an open bottom, which matches the open surface of the front half furnace body 4 and the rear half furnace body 1 to form a complete baking chamber; the bottom surface of the splicing unit 2 is the same as the front half furnace body 4 and the rear half furnace body 1, and is closed to the ground through the structural base 6. In other embodiments, the splicing unit 2, the front half furnace body 4, and the rear half furnace body 1 can also be designed with an arched or other baking chamber cross-sectional shape to meet the requirements of different baking processes.

[0037] The outer contour of the splicing unit 2 is a carbon steel shell frame 11, and the cross section of the carbon steel shell frame 11 is T-shaped, with the outer plane of the wing plate of the T-shaped cross section facing outward and the web facing inward. On the one hand, the carbon steel shell frame 11 can serve as the outer shell structure of the splicing unit 2 and provide sufficient strength and rigidity for the roasting chamber 7 together with the furnace shell of the rear half furnace body 1 and the front half furnace body 4. On the other hand, the inner side of the splicing unit 2 is also configured with refractory material blocks 12 similar to the refractory inner layer effect of the rear half furnace body 1 and the front half furnace body 4. The refractory material blocks 12 are integrally formed on both sides of the corresponding web positions on the carbon steel shell frame 11. The structural design of the splicing units 2 allows them to withstand high temperatures without deformation during the roasting process, ensuring the stability and continuity of the roasting process.

[0038] The refractory block 12 and the refractory inner layer are formed of the same refractory material, and the refractory block 12 is foamed to reduce its density and weight. In order to compensate for the strength defects and refractory performance differences caused by foaming, and to take a structural photograph of the inner surface, the corresponding splicing unit 2 is formed with a leveling filler layer 14 on the inner side surface of the refractory block 12. The leveling filler layer 14 is formed with one or a combination of aluminum silicate fibers, ceramic fibers, refractory bricks, refractory mud, and rock wool with better thermal conductivity than the refractory block 12 as a filler material to optimize the thermal conductivity of the refractory block 12. The combination of the refractory structure of the refractory inner layer, the refractory block 12, and the leveling filler layer 14 can effectively reduce the overall weight of the roasting furnace, facilitate the setting of the splicing unit 2, and at the same time improve the thermal efficiency of the roasting furnace, reduce the thermal stress caused by material mismatch, and thus extend the service life of the roasting furnace. In addition, by using the same refractory material for the refractory inner layer and the refractory block 12, the maintenance and replacement process of the roasting furnace can be simplified, thereby reducing maintenance costs.

[0039] In this embodiment, in order to improve performance, the carbon steel shell plate frame 11 is welded with triangular reinforcing ribs 20 between the web and the wing plate. These triangular reinforcing ribs 20 are staggered on both sides of the wing plate and are evenly spaced along the length direction of the carbon steel shell plate frame 11. The combination of the triangular reinforcing ribs 20 can enhance the structural strength of the carbon steel shell plate frame 11 on the one hand, and can also help to improve the adhesion strength and overall stability of the refractory block 12 on the carbon steel shell plate frame 11 on the other hand.

[0040] In addition, in order to facilitate the positioning and splicing of the splicing unit 2, the splicing unit 2 is respectively formed with matching plug-in grooves 13 and plug-in blocks 19 on the outer surfaces of the refractory blocks 12 on both sides, and correspondingly, the front half furnace body 4 and the rear half furnace body 1 are formed with corresponding plug-in grooves 13 or plug-in blocks 19 on the inner surface of the refractory material at the corresponding side positions. Through the combination of the above-mentioned plug-in grooves 13 and plug-in blocks 19, the front half furnace body 4, the rear half furnace body 1 and the splicing unit 2, as well as the adjacent splicing units 2 can be plug-in spliced, and the staggered closure can be achieved at the plug-in position of the plug-in groove 13 and the plug-in block 19.

[0041] As a further improvement, other sealing structures can be arranged between adjacent splicing units 2 and between the splicing units 2 and the front half furnace body 4 and the rear half furnace body 1 to ensure the sealing of the roasting chamber 7. The corresponding other sealing structures are usually made of high temperature resistant and wear-resistant materials, such as silicone rubber or asbestos sheets, etc., which can withstand pressure and wear in high temperature environments while maintaining a good sealing effect. Through this design, even if thermal expansion occurs during the roasting process, the roasting chamber 7 can maintain good sealing, avoid leakage of heat and gas, thereby ensuring the stability and safety of the roasting process. In addition, the use of sealing structures can also reduce the energy loss of the roasting furnace during operation and further improve the utilization rate of energy.

[0042] When the graphitization furnace of this embodiment is used, a bottom liner 17 needs to be built in the baking chamber 7. The bottom liner 17 is paved with refractory bricks and matches the length of the baking chamber 7. Side guards 10 are built on both sides of the bottom liner 17. The upper surface of the bottom liner 17 and the area between the side guards 10 on both sides can be used as the stacking area of ​​the carbon products 9 to be processed. During processing, it is only necessary to place the corresponding carbon products 9 in the area in a suitable manner and fill them with fillers 8 as shown in the figure. Figure 2 The roasting operation can be started by protective filling in the style shown. In addition, in this embodiment, in order to optimize the roasting effect, the bottom of the liner 17 is uniformly formed with through holes as the high-temperature flue gas channel 8. At the same time, a heat-conducting buffer layer 16 is also paved on the surface of the aforementioned stacking area. The heat-conducting buffer layer 16 is formed by a metallurgical coke particle layer. The particle size of the metallurgical coke is 30mm to 80mm, and the particle size of the metallurgical coke decreases continuously from the surface of the liner to the top. The setting of the high-temperature flue gas channel 8 can effectively promote the uniform distribution of hot air flow, ensure that the carbon product 9 can effectively relieve thermal stress, reduce thermal expansion and contraction caused by temperature changes, and help reduce thermal stress while ensuring that the carbon product 9 is heated evenly during the roasting process, preventing the carbon product 9 from being deformed or damaged during the roasting process. In addition, the metallurgical coke particle layer of the heat-conducting buffer layer 16 can also absorb and disperse part of the heat to avoid local overheating, thereby extending the service life of the roasting furnace and reducing energy consumption.

[0043] In another embodiment, the roasting furnace may also be provided with a gas heating interlayer in the interlayer area between the side guard 10 and the leveling filler layer 14 to provide a heating source under an optimized solution. The technical solution of the gas heating interlayer can be realized through a series of evenly distributed gas nozzles, and its layout design ensures that heat is evenly transferred to the entire roasting chamber, thereby achieving uniform heating of the carbon product. In addition, other configuration schemes of the gas heating interlayer can be adjusted according to different roasting process requirements to achieve the best roasting effect.

[0044] 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. A roasting furnace for preparing carbon products, characterized in that: It includes a roasting furnace body, which is a horizontal furnace body structure, including half furnace bodies on both sides and a splicing unit; The half furnace body comprises a carbon steel shell and a refractory inner layer formed inside the carbon steel shell. The roasting furnace body has a discharge port connected to the roasting chamber and a gas introduction and exhaust system for adjusting the atmosphere in the roasting chamber on the surface of the half furnace body on one side. The splicing unit comprises a carbon steel outer shell frame matching the open surface of the half furnace body, the carbon steel outer shell frame having a T-shaped cross section, the wing plate of the T-shaped cross section facing outward, refractory material blocks formed on both sides of the web, the refractory material blocks having the same thickness as the refractory material inner layer of the half furnace body; a leveling filler layer is formed on the surface of the refractory material block, and the leveling filler layer has a thermal conductivity greater than that of the refractory material block; The splicing units are formed with matching plug-in structures as splicing structures on both side surfaces of the refractory material block and on the inner layer side surface of the refractory material on the open side of the half furnace body; the roasting furnace body is formed by combining and splicing a plurality of continuous splicing units between the two half furnace bodies to form the outer shell of the roasting furnace, and the length dimension of the roasting cavity is controlled by controlling the number of connected splicing units, thereby adjusting the length dimension of the roasting cavity.

2. The roasting furnace for preparing carbon products according to claim 1, characterized in that: The roasting furnace is also provided with a bottom lining in the roasting chamber. The bottom lining is paved with refractory bricks and matches the length of the roasting chamber. Side guards are formed on both sides of the bottom lining. The roasting chamber uses the area enclosed by the side guards and the bottom lining as a stacking area for the carbon materials to be processed.

3. The roasting furnace for preparing carbon products according to claim 2, characterized in that: The roasting furnace is provided with a gas heating interlayer in the space area inside the splicing unit and outside the side baffle.

4. The roasting furnace for preparing carbon products according to claim 2, characterized in that: The bottom of the substrate is evenly formed with through holes as high-temperature flue gas channels; at the same time, a thermally conductive buffer layer is laid in the stacking area of ​​the carbon material to be processed, and the thermally conductive buffer layer is formed by a metallurgical coke particle layer. The particle size of the metallurgical coke is 30mm to 80mm, and the particle size of the metallurgical coke decreases continuously from the surface of the substrate upward.

5. The roasting furnace for preparing carbon products according to claim 1, characterized in that: A slide is provided at the bottom of the setting position of the roasting furnace body, and the half furnace body and all the splicing units are arranged on the slide structure, and the position can be adjusted and the splicing units can be removed / added through the slide.

6. The roasting furnace for preparing carbon products according to claim 1, characterized in that: The roasting furnace also includes a heating device for heating the carbon material in the roasting chamber, and the heating device includes a plurality of heating elements, which are natural gas heating elements or electric heating elements or a combination of the two; the heating elements are evenly distributed around the roasting chamber to ensure temperature uniformity during the roasting process.

7. The roasting furnace for preparing carbon products according to claim 1, characterized in that: The roasting furnace also includes a temperature control system, which is a combination of a temperature sensor and a heating element control unit.

8. The roasting furnace for preparing carbon products according to claim 1, characterized in that: The refractory material inner layer and the refractory material block are formed of the same material, and the refractory material block is foamed to reduce its density and weight.

9. The roasting furnace for preparing carbon products according to claim 1, characterized in that: The leveling filler layer formed on the surface of the refractory material block uses one or a combination of aluminum silicate fiber, ceramic fiber, refractory brick, refractory mud, and rock wool as filler material.

10. The roasting furnace for preparing carbon products according to claim 1, characterized in that: The carbon steel shell plate frame is formed with anchoring protrusion structures on the inner side of the wing plate of the T-section and on both sides of the web plate to improve the stability of the refractory material blocks attached to the carbon steel shell plate frame.

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