Process for discharging graphitized product from furnace at high temperature
By cooling to 600-700°C in the high-temperature furnace process of graphitized products and then heating the furnace, the problem of pores caused by long cooling time in the prior art is solved, and the effect of shortening the production cycle and improving product quality is achieved.
Patent Information
- Application Number
- CN202510421555.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-04-07
- Publication Date
- 2025-05-13
AI Technical Summary
The high-temperature discharge process of existing graphitized products takes 65 days or even longer during the cooling process, resulting in the generation of internal pores and affecting product quality and flexural strength.
A high-temperature oven discharge process of graphitized products is adopted, including charging, heating, cooling and heat oven discharge steps. The specific steps are: pretreat the raw materials and graphitize them in the furnace, cool them to 600-700°C and then heat them out, and use the material suction truck and fixture to perform precise operations to remove the insulation material and remove the graphite product.
It effectively shortens the production cycle, reduces the generation of pores in the product, and improves product quality and yield. Specifically, the product that is heated after cooling to 650°C has a porosity of ≤5% and a pore diameter of ≤0.2mm, which significantly improves the quality of graphite products.
Smart Images
Figure CN119983816A_ABST
Abstract
Description
Technical Field
[0001] The invention relates to the technical field of catering equipment, and in particular to a high-temperature furnace discharge process for graphitized products. Background Art
[0002] The existing high-temperature furnace process for graphitized products mostly uses natural cooling after the graphite products are heated. Due to the thermal insulation of the furnace body and the large heat capacity of the product, the internal natural cooling is slow, usually taking 65 days or even longer.
[0003] During this long cooling process, the gas inside the product may gradually gather and form pores due to factors such as temperature drop and pressure change. Because at high temperatures, some gaseous substances may be produced inside the product, such as carbon dioxide and carbon monoxide produced by decomposition. During the cooling process, these gases have no suitable discharge channels, which easily forms pores inside the product.
[0004] When a large number of pores appear in graphite products, it not only affects the surface quality, but also causes a decrease in flexural strength, making the product fail to meet usage requirements; therefore, there is an urgent need for a production process that can shorten the production cycle and reduce the generation of pores. Summary of the invention
[0005] The purpose of the present invention is to solve the above problems and provide a high-temperature furnace-out process for graphitized products that can effectively shorten the entire production cycle, improve product quality, and reduce the generation of pores in the products.
[0006] To achieve the above-mentioned purpose, the technical solution of the present invention is: a high-temperature furnace discharge process for graphitized products, comprising the following steps: S1: charging, placing the pretreated raw materials into the furnace, and filling and covering the raw materials with insulation materials; S2: heating, heating by energizing the electrodes to raise the temperature in the furnace to 2800-3000°C to graphitize the raw materials; S3: cooling, cutting off the power supply after graphitization of the raw materials, allowing the product to naturally cool to 600-700°C in the furnace; S4: cooling to 600-700°C and then discharging the product hot.
[0007] Preferably, the hot furnace removal in step S4 includes the following steps: S401: Start the suction crane and move it to the corresponding position directly above the graphitization furnace, wherein the suction crane moves along a preset track, and the preset track covers various positions in the furnace that need to be operated; S402: The suction part at the bottom of the suction crane enters the furnace, and gradually absorbs and removes the insulation material covering the top of the graphite product until the graphite product is completely leaked out; S403: Start the crane and move it to directly above the graphite product, and the clamp extends into the furnace to accurately clamp and take out the graphite product; S404: After taking out, the crane transports the graphite product along a predetermined path to transfer the graphite product to a predetermined position.
[0008] Preferably, the insulation material in step S1 is petroleum coke powder with a particle size less than 2 mm.
[0009] Preferably, the heating rate in the furnace in step S2 is 5-15°C / min.
[0010] Preferably, a stainless steel thermocouple is provided in the graphitization furnace, and the temperature in the furnace is monitored by the stainless steel thermocouple.
[0011] Preferably, the step S3 is naturally cooled to 650°C.
[0012] Preferably, in step 403, the clamp is designed according to the shape and size characteristics of the graphite product and the opening and closing of the clamp is controlled by a mechanical arm and pneumatics.
[0013] The invention discloses a high-temperature furnace-out process for graphitized products, comprising the following steps: S1: charging, placing pretreated raw materials into a furnace, and filling and covering the raw materials with insulation materials; S2: heating, heating by energizing electrodes to increase the temperature in the furnace to 2800-3000° C. to graphitize the raw materials; S3: cooling, cutting off the power supply after graphitization of the raw materials, allowing the products to naturally cool to 600-700° C. in the furnace; S4: hot-out after cooling to 600-700° C.; compared with the prior art, the high-temperature furnace-out process for graphitized products has the beneficial effects of effectively shortening the entire production cycle, improving product quality, and reducing the generation of pores in the products when used. BRIEF DESCRIPTION OF THE DRAWINGS
[0014] Figure 1 Schematic diagram of a product produced at 650°C using a high-temperature furnace process for graphitized products of the present invention Figure 1 .
[0015] Figure 2 A schematic diagram of a product produced at 600°C using a high-temperature furnace process for graphitized products of the present invention Figure 1 .
[0016] Figure 3 Schematic diagram of a product produced at 630°C using a high-temperature furnace process for graphitized products of the present invention Figure 1 .
[0017] Figure 4 The product produced at 680℃ by using the high temperature furnace process of the graphitized product of the present invention is shown in FIG. Figure 1 .
[0018] Figure 5 A schematic diagram of a product produced at 700°C using a high-temperature furnace process for graphitized products of the present invention Figure 1 .
[0019] Figure 6The present invention is a schematic diagram of a material suction component in a high-temperature furnace discharge process of a graphitized product.
[0020] Figure 7 The figure is a schematic diagram of a fixture in a high-temperature furnace-out process of a graphitized product according to the present invention. DETAILED DESCRIPTION
[0021] The present invention will now be described in further detail with reference to the accompanying drawings. The accompanying drawings are simplified schematic diagrams, which only illustrate the basic structure of the present invention in a schematic manner, and thus only show the components related to the present invention.
[0022] Embodiment 1: A high-temperature furnace discharge process for graphitized products, comprising the following steps: S1: loading, placing pretreated raw materials into the furnace, and filling and covering the raw materials with insulation material, wherein the insulation material is petroleum coke powder with a particle size of less than 2 mm; S2: heating, heating by energizing the electrodes to raise the temperature in the furnace to 2800-3000°C to graphitize the raw materials, wherein the heating rate in the furnace is 5-15°C / min; S3: cooling, after graphitization of the raw materials is completed, cutting off the power supply, allowing the product to naturally cool to 600°C in the furnace; S4: hot discharge after cooling to 600°C; The hot discharge in step S4 comprises the following steps: S401: starting the suction crane and moving it to the corresponding position directly above the graphitization furnace, wherein the suction crane moves along a preset track, and the preset track covers each position in the furnace that needs to be operated; S402: The suction part at the bottom of the suction crane enters the furnace, and gradually absorbs and removes the insulation material covering the graphite product until the graphite product is completely leaked out; S403: The crane is started and moved to the top of the graphite product, and the clamp is extended into the furnace to accurately clamp and remove the graphite product; the clamp is designed according to the shape and size characteristics of the graphite product and the opening and closing of the clamp is controlled by a mechanical arm and pneumatics; S404: After removal, the crane transports the graphite product along a predetermined path and transfers the graphite product to a predetermined position.
[0023] In this embodiment, a stainless steel thermocouple is provided in the graphitization furnace, and the temperature in the furnace is monitored by the stainless steel thermocouple.
[0024] Embodiment 2: A high-temperature furnace discharge process for graphitized products, comprising the following steps: S1: loading, placing the pretreated raw materials into the furnace, and filling and covering the raw materials with insulation material, wherein the insulation material is petroleum coke powder with a particle size of less than 2 mm; S2: heating, heating by energizing the electrodes to raise the temperature in the furnace to 2800-3000°C to graphitize the raw materials, wherein the heating rate in the furnace is 5-15°C / min; S3: cooling, after the raw materials are graphitized, cutting off the power supply, allowing the product to naturally cool to 650°C in the furnace; S4: cooling to 650°C before hot discharge; The hot discharge in step S4 comprises the following steps: S401: starting the suction crane and moving it to the corresponding position directly above the graphitization furnace, wherein the suction crane moves along a preset track, and the preset track covers each position in the furnace that needs to be operated; S402: The suction part at the bottom of the suction crane enters the furnace, and gradually absorbs and removes the insulation material covering the graphite product until the graphite product is completely leaked out; S403: The crane is started and moved to the top of the graphite product, and the clamp is extended into the furnace to accurately clamp and remove the graphite product; the clamp is designed according to the shape and size characteristics of the graphite product and the opening and closing of the clamp is controlled by a mechanical arm and pneumatics; S404: After removal, the crane transports the graphite product along a predetermined path and transfers the graphite product to a predetermined position.
[0025] In this embodiment, a stainless steel thermocouple is provided in the graphitization furnace, and the temperature in the furnace is monitored by the stainless steel thermocouple. Embodiment 3: A high-temperature furnace discharge process for graphitized products, comprising the following steps: S1: loading, placing the pretreated raw materials into the furnace, and filling and covering the raw materials with insulation material, wherein the insulation material is petroleum coke powder with a particle size of less than 2 mm; S2: heating, heating by energizing the electrodes to raise the temperature in the furnace to 2800-3000°C to graphitize the raw materials, wherein the heating rate in the furnace is 5-15°C / min; S3: cooling, after the raw materials are graphitized, the power is cut off, and the product is naturally cooled to 700°C in the furnace; S4: hot discharge after cooling to 700°C; the hot discharge in step S4 comprises the following steps: S401: starting the suction crane and moving it to the corresponding position directly above the graphitization furnace, wherein the suction crane moves along a preset track, and the preset track covers all positions in the furnace that need to be operated; S402: the suction part at the bottom of the suction crane enters the furnace, and gradually absorbs and removes the insulation material covering the top of the graphite product until the graphite product is completely leaked out; S403: Start the crane and move it to the top of the graphite product. The clamp extends into the furnace to accurately clamp and take out the graphite product. The clamp is designed according to the shape and size characteristics of the graphite product and the opening and closing of the clamp is controlled by a mechanical arm and pneumatics. S404: After taking out, the crane transports the graphite product along a predetermined path and transfers the graphite product to a predetermined position.
[0026] Based on the above embodiment, a stainless steel thermocouple is provided in the graphitization furnace, and the temperature in the furnace is monitored by the stainless steel thermocouple.
[0027] The invention can shorten the cooling time and avoid the generation of pores inside the product by hot-outleting at 650° C., thereby shortening the production cycle and improving the quality and yield rate of graphite products.
[0028] Please refer again Figure 1-5 , Figure 1-5 The part in the middle circle is enlarged; Figure 1 When the graphitized product is naturally cooled to 650℃ in the furnace, it is hot-out of the furnace. After being out of the furnace, the product is cut in half. There are no pores on the surface after cutting, and the overall porosity is ≤5%; Figure 2 The graphitized product is taken out of the furnace when it is naturally cooled to 600℃. After being taken out of the furnace, the product is cut in half. After cutting, pores appear on the surface (the pores are black points in the figure). The circle is magnified and more obvious. The overall porosity is 15±3%; Figure 3 The graphitized product is naturally cooled to 630℃ in the furnace and then taken out of the furnace. After being taken out of the furnace, the product is cut in half. After cutting, pores appear on the surface (the pores are black points in the figure). The circle is magnified and more obvious. The overall porosity is 8±3%; Figure 4 The graphitized product is naturally cooled to 680℃ in the furnace before being taken out of the furnace. After being taken out of the furnace, the product is cut in half. After cutting, pores appear on the surface (the pores are black points in the figure). The circle is magnified and more obvious. The overall porosity is 8±3%; Figure 5 The graphitized product is taken out of the furnace hot when it is naturally cooled to 700°C. After being taken out of the furnace, the product is cut in half. After cutting, pores appear on the surface (the pores are black origins in the figure). The circle is magnified and more obvious. The overall porosity is 15±3%.
[0029] Please refer again Figure 2 and Figure 5 , when heated out of the oven at 600℃ or 700℃, the pore size is 0.8-1.2mm, and Figure 3 and Figure 4 When hot-out at 630℃ or 680℃, the pore size is 0.3-0.5mm.
[0030] That is to say, when the hot furnace is taken out in step S4, the closer the furnace temperature is to 650°C, the smaller the porosity and the smaller the pore diameter, that is, the higher the quality of the graphite product.
[0031] The experimental data of the embodiments and comparative examples are shown in the following table: In the conventional process (Comparative Example 3), the product is naturally cooled to room temperature (22±2°C) in the graphitization furnace in step S3. Since the internal temperature is relatively high and the product is covered with petroleum coke powder, the natural cooling process needs to wait for about 65 days, which undoubtedly prolongs the entire production cycle. After the heating in the furnace is stopped, the daily cooling rate is relatively high in the early stage, while in the later stage, due to the gradual decrease in the temperature difference between the inside and outside of the furnace, the cooling rate becomes slower and slower. If it is naturally cooled to room temperature, it will take a lot of time. At the same time, the quality of the graphitized product naturally cooled to room temperature is poor. When the product is cut in half during inspection, the porosity of the cross section is ≥20%, and the pore diameter is generally greater than 1.2 mm, which means that the quality is poor.
[0032] In order to shorten the entire production cycle and improve product quality at the same time, the production personnel heat the products out of the oven in advance at different temperatures, namely, Examples 1, 2, and 3 in the present application, and their effects are combined with Comparative Examples 1 and 2.
[0033] In step S4 of Example 1 of this process, the product is cooled to 600°C before being taken out of the hot furnace. After being taken out of the hot furnace, the covering insulation material is first detached, and the product can also directly contact the external room temperature, which can greatly improve the natural cooling efficiency. It takes about 40 days to cool to room temperature. When the product is taken out of the hot furnace at 600°C and naturally cooled to room temperature, it is cut in half for inspection, and its porosity is 15±3%, and the pore diameter is 0.8-1.2mm. Compared with Comparative Example 3, it has the effect of significantly shortening the production cycle and improving product quality.
[0034] In step S4 of Example 2 of this process, the product is cooled to 650°C and then taken out of the hot furnace. After being taken out of the hot furnace, the product is naturally cooled to room temperature and the product is cut in half for inspection. Its porosity is ≤5% and the pore diameter is ≤0.2mm. It takes about 45 days to naturally cool from the hot furnace at 650°C to room temperature. Although it is longer than the 40 days in Example 1, the product quality is significantly improved and the porosity and pore diameter can be greatly reduced.
[0035] In step S4 of Example 3 of this process, the product is cooled to 700°C and then taken out of the hot oven. After being taken out of the hot oven, the product is naturally cooled to room temperature and the product is cut in half for inspection. The porosity is 15±3%, and the pore diameter is 0.8-1.2 mm. It takes about 52 days to naturally cool from the hot oven at 700°C to room temperature, which is longer than Examples 1 and 2. At the same time, the porosity and pore diameter are also higher than Examples 1 and 2, and the effect is not good.
[0036] In addition, please refer to the comparative examples 1 and 2 in the above table. The hot-out-of-furnace temperatures are 630°C / 680°C, and the porosity and pore diameter are both lower than those of Example 2. Although the cooling time after the comparative example 1 is relatively short, the overall difference is not large. Considering the quality mainly, it is generally lower than the 650°C hot-out-furnace of Example 2.
[0037] It can be seen from the above table that the closer the hot-out furnace temperature is to 650°C, the smaller the porosity and pore diameter of the product will be, and the higher the quality will be. Therefore, in subsequent production, hot-out furnace is usually carried out at 650°C.
[0038] Obviously, the above embodiments are merely examples for the purpose of clear explanation, and are not intended to limit the implementation methods. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived therefrom are still within the scope of protection of the invention.
Claims
1. A high temperature furnace process for graphitized products, characterized in that: The method comprises the following steps: S1: loading, placing the pretreated raw materials into the furnace, and filling and covering the raw materials with insulation materials; S2: heating, heating by energizing the electrodes to raise the temperature in the furnace to 2800-3000°C to graphitize the raw materials; S3: cooling, cutting off the power supply after graphitization of the raw materials, and allowing the product to naturally cool to 600-700°C in the furnace; S4: taking the product out of the furnace hot after cooling to 600-700°C.
2. The high temperature furnace discharge process of graphitized products according to claim 1, characterized in that: The hot furnace removal in step S4 includes the following steps: S401: Start the suction crane and move it to the corresponding position directly above the graphitization furnace, wherein the suction crane moves along a preset track, and the preset track covers all positions in the furnace that need to be operated; S402: The suction part at the bottom of the suction crane enters the furnace, and gradually absorbs and removes the insulation material covering the top of the graphite product until the graphite product is completely leaked out; S403: Start the crane and move it to directly above the graphite product, and the clamp extends into the furnace to accurately clamp and take out the graphite product; S404: After taking out, the crane transports the graphite product along a predetermined path and transfers the graphite product to a predetermined position.
3. The high temperature furnace discharge process of graphitized products according to claim 1, characterized in that: The insulation material in step S1 is petroleum coke powder with a particle size less than 2 mm.
4. The high temperature furnace discharge process of graphitized products according to claim 1, characterized in that: In step S2, the heating rate in the furnace is 5-15°C / min.
5. The high temperature furnace discharge process of graphitized products according to claim 1, characterized in that: A stainless steel thermocouple is provided in the graphitization furnace, and the temperature in the furnace is monitored by the stainless steel thermocouple.
6. The high temperature furnace discharge process of graphitized products according to claim 1, characterized in that: In the step S3, the temperature is naturally cooled to 650°C.
7. The high temperature furnace discharge process of graphitized products according to claim 2, characterized in that: In step 403, the clamp is designed according to the shape and size characteristics of the graphite product and the opening and closing of the clamp is controlled by a mechanical arm and pneumatics.