Carbon product sintering system

Abstract

The utility model provides a carbon product sintering system which comprises a carbon product sintering furnace which comprises a furnace body used for containing one or more to-be-sintered green bodies, and the peripheries of the green bodies are filled with resistance materials; the one or more thermocouples are suitable for being arranged in the resistance material, and the thermocouples are suitable for feeding back temperature signals from the furnace body; the power supply is suitable for supplying power to the carbon product sintering furnace according to the electrical output parameters, so that the resistance material is heated to sinter the green body; and the power supply control equipment is suitable for receiving the temperature signal when the carbon product sintering furnace works. The carbon product sintering system can greatly improve the yield of the carbon products on the basis of reducing the cost.

Description

Carbon product sintering system Technical Field

[0001] This application relates primarily to the field of graphitization, and more particularly to a carbon product sintering system. Background Technology

[0002] In the field of graphitization, to improve the quality and reduce the production cost of special carbon products and large-format carbon-graphite products (electrodes, anodes, cathodes, crucibles), besides improving raw material performance, optimizing the performance matching between raw materials, and improving mixing quality, the quality of sintering is a crucial factor. For example, among special carbon products, isostatic graphite, as a premium graphite material, possesses a series of excellent properties and is widely used in photovoltaics, semiconductors, nuclear reactors, defense, and medical industries. Currently, most isostatic graphite products produced by isostatic graphite manufacturers in the market have low performance, limited variety, and the inability to produce ultra-large-format, high-performance isostatic graphite, or the low quality of ultra-large-format products they produce. Especially for large-format isostatic graphite, production volume is very low. The main reason is that large-format isostatic graphite products are difficult to calcine, resulting in low yield and high manufacturing costs. Due to uneven calcination quality, secondary cracking is easily caused during graphitization, ultimately resulting in a total yield of less than 40% after graphitization.

[0003] Furthermore, for other carbon products, such as large-size steelmaking electrodes and large-size aluminum cathodes, existing sintering methods still cannot effectively improve product quality and reduce costs. Therefore, there is an urgent need in this field for a carbon product sintering solution that can improve the quality of different types of carbon products. Summary of the Invention

[0004] The technical problem to be solved by this application is to provide a carbon product sintering system and method, carbon products and carbon graphite products, which can significantly improve the yield of carbon products while reducing costs.

[0005] To address the aforementioned technical problems, this application provides a carbon product sintering system, comprising: a carbon product sintering furnace, including a furnace body for accommodating one or more green blanks to be sintered, wherein the green blanks are surrounded by a resistance material; one or more thermocouples adapted to provide feedback of temperature signals from the furnace body; a power supply adapted to supply power to the carbon product sintering furnace according to electrical output parameters, thereby heating the resistance material to sinter the green blanks; and a power control device adapted to receive the temperature signals when the carbon product sintering furnace is in operation.

[0006] Optionally, in the carbon product sintering furnace, conductive electrodes are also provided on both sides of the furnace body, and the power supply supplies power to the carbon product sintering furnace through the conductive electrodes.

[0007] Optionally, in the carbon product sintering furnace, the furnace body also has conductive walls on both sides, and the resistive material is adapted to be electrically connected to the conductive electrode through the conductive walls.

[0008] Optionally, the carbon product sintering furnace further includes a copper busbar or an aluminum busbar, which is adapted to be connected between the conductive electrode and the power source.

[0009] Optionally, the electrical output parameters include an output current of 30,000 to 80,000 amperes and / or an output voltage of 15 to 120 volts.

[0010] Optionally, the carbon product sintering furnace further includes a refractory furnace wall that at least partially surrounds the furnace body, wherein the refractory furnace wall is made of clay.

[0011] Optionally, the carbon product sintering furnace also includes a support frame, which is fixedly connected to the furnace wall.

[0012] Optionally, the carbon product sintering furnace further includes a base located below the furnace body.

[0013] Optionally, the resistive material includes a first type of coke particles with a particle size of 5 mm to 8 mm, wherein the first type of coke particles includes calcined petroleum coke particles and / or graphitized coke particles.

[0014] Optionally, the furnace cover is a gravity furnace cover, which is configured to provide a pressure of 2 to 6 tons per square meter to the resistance material and the one or more green billets to be sintered inside the furnace from top to bottom.

[0015] Optionally, it also includes an insulating layer located above the furnace body, or simultaneously above and below the furnace body, or simultaneously above, below and around the furnace body, wherein the insulating layer includes second-type coke particles with a particle size of 0-2 mm, and the second-type coke particles include calcined petroleum coke particles and / or graphitized coke particles.

[0016] Optionally, the content of particles with a size of less than 0.5 mm in the second type of coke particles is no more than 40%.

[0017] Optionally, the furnace body generates flue gas during operation, and the furnace cover further includes an exhaust channel suitable for the flow of the flue gas. The insulation layer further includes a first type of coke particles with a particle size of 5mm to 8mm, comprising calcined petroleum coke particles and / or graphitized coke particles. The first type of coke particles form a coarse coke particle region with a diameter of 250mm to 500mm in the insulation layer. The coarse coke particle region corresponds to the exhaust channel in the furnace cover in the direction of flue gas flow.

[0018] Optionally, the system further includes a green body production device, and the system is further configured to deliver the flue gas discharged through the exhaust channel to the green body production device as a heat source for heating the heat transfer oil during the production of the green body.

[0019] Optionally, the power control device is configured to control the power supply to adjust the electrical output parameters according to the temperature signal. The resistance material has multiple thermocouples, including a temperature-controlling thermocouple located at the center of the furnace body and one or more temperature-measuring thermocouples distributed in other areas of the furnace body. The power control device is further configured to: receive a first temperature signal containing the temperature control temperature fed back by the temperature-controlling thermocouple, and a second temperature signal containing the temperature measurement temperature fed back by the multiple temperature-measuring thermocouples; calculate the temperature difference between the temperature control temperature and each of the temperature measurement temperatures; and control the power supply to adjust the electrical output parameters according to the comparison relationship between the temperature difference and a threshold.

[0020] Optionally, the power control device is further configured to: when the temperature difference is higher than the threshold, control the power supply to maintain the current electrical output parameters unchanged until the temperature difference is lower than or equal to the threshold; when the temperature difference is lower than or equal to the threshold, control the power supply to adjust the electrical output parameters so that the furnace body of the carbon product sintering furnace continues to heat up.

[0021] Optionally, the power supply is configured as an on-load adjustable voltage switch with more than 200 levels, and the power supply is adapted to adjust the electrical output parameters via the on-load adjustable voltage switch.

[0022] To better understand the carbon product sintering system proposed above, another aspect of this application proposes a carbon product sintering method. The carbon product sintering system includes a carbon product sintering furnace, a power supply, and a power control device. The method includes the following steps: loading one or more green blanks to be sintered into the furnace body of the carbon product sintering furnace, and simultaneously filling resistance material around the green blanks; placing one or more thermocouples in the resistance material, the thermocouples being adapted to provide feedback of temperature signals from the furnace body; activating the power control device and the power supply to start the carbon product sintering system; receiving the temperature signal through the power control device and controlling the power supply to adjust electrical output parameters according to the temperature signal; and supplying power to the carbon product sintering furnace according to the electrical output parameters, thereby heating the resistance material to sinter the green blanks.

[0023] Optionally, in the step of loading one or more green billets to be sintered into the furnace body, the plurality of green billets to be sintered are loaded into the furnace body at a uniform spacing.

[0024] Optionally, the resistive material includes calcined petroleum coke particles and / or graphitized coke particles, and the method further includes sieving and mixing the calcined petroleum coke particles and / or the graphitized coke particles before filling the resistive material.

[0025] Optionally, the step of placing one or more thermocouples in the resistive material further includes: placing the thermocouples while filling the resistive material; or placing a protective tube while filling the resistive material, and placing the one or more thermocouples in the corresponding protective tubes before starting the power control device and the power supply.

[0026] Optionally, the plurality of thermocouples includes a temperature-controlling thermocouple located at the center of the furnace body and one or more temperature-measuring thermocouples distributed in other areas of the furnace body. The step of receiving the temperature signal through the power control device and controlling the power supply to adjust the electrical output parameters according to the temperature signal further includes: receiving a first temperature signal containing the temperature control temperature fed back by the temperature-controlling thermocouple, and a second temperature signal containing the temperature measurement temperature fed back by the plurality of temperature-measuring thermocouples; calculating the temperature difference between the temperature control temperature and each of the temperature measurement temperatures, and controlling the power supply to adjust the electrical output parameters according to the comparison relationship between the temperature difference and a threshold.

[0027] Optionally, the method further includes: when the temperature difference is higher than the threshold, controlling the power supply to maintain the current electrical output parameters unchanged until the temperature difference is lower than or equal to the threshold; when the temperature difference is lower than or equal to the threshold, controlling the power supply to adjust the electrical output parameters so that the furnace body of the carbon product sintering furnace continues to heat up.

[0028] Optionally, the method further includes recording, during the current sintering process of the green blank, the temperature difference between the measured temperature and the controlled temperature fed back by each of the temperature measuring thermocouples being higher than the threshold value, and adjusting the position of the temperature measuring thermocouples in the furnace body according to the temperature deviation during the next sintering process of the green blank.

[0029] Another aspect of this application proposes a carbon product, which is sintered using the carbon product sintering method of any embodiment of this application.

[0030] Another aspect of this application proposes a carbon-graphite product obtained by subjecting the carbon product in the above embodiments of this application to an impregnation-baking process and a graphitization process.

[0031] Optionally, the impregnation and baking process includes impregnation and secondary electro-calcination, and / or the graphitization process includes high-temperature graphitization treatment at a temperature above 2500 degrees Celsius. Exemplarily, the secondary electro-calcination is implemented using the carbon product sintering system and related processes proposed in any embodiment of this application.

[0032] Optionally, the carbon graphite products include special carbon products.

[0033] Optionally, the special carbon product includes isostatically pressed graphite.

[0034] Optionally, the dimensional parameters of the special carbon graphite product are greater than 500 mm. For example, the dimensional parameters are determined by the shape and other characteristics of the carbon graphite product. For instance, for a circular carbon graphite product, the dimensional parameter is the diameter, while for a square carbon graphite product, the dimensional parameter is the side length. For other shapes or irregular shapes, the dimensional parameter can be understood as the minimum value among the measurable dimensional parameters of the outer boundary. This application does not impose any limitations on this.

[0035] Compared with existing technologies, this application has the following advantages: By setting up the linkage between thermocouples and power control equipment, this application adjusts the electrical output parameters of the power supply (e.g., a transformer, preferably a rectifier transformer) in real time, enabling the carbon product sintering furnace to perform heating and calcination according to a set calcination curve, thereby improving yield and reducing costs. In some preferred embodiments, the use of a multi-stage voltage-regulating rectifier power supply can accurately control the electrical output parameters of the power supply, thus finely controlling temperature changes. In addition, the system has an improved carbon product sintering furnace, which, through pressurized calcination and other methods, combined with a thermocouple temperature signal feedback adjustment mechanism, significantly improves product quality while reducing production costs, resulting in products with excellent material properties. In summary, the carbon product sintering equipment and process scheme of this application, for all carbon products, uses a set calcination curve for heating and calcination, and all have the advantages of uniform calcination quality and significantly improved yield. In particular, the improvement effect is more obvious for large-sized carbon products or carbon-graphite products. Among these, special carbon products with large dimensions (e.g., 500mm and above) have a more prominent effect on quality improvement and economic benefits in reducing costs. Attached Figure Description

[0036] The accompanying drawings are included to provide a further understanding of this application; they are incorporated into and constitute a part of this application. The drawings illustrate embodiments of this application and, together with this specification, serve to explain the principles of this application. In the drawings:

[0037] Figure 1 is a schematic diagram of the system architecture of a carbon product sintering system according to an embodiment of this application;

[0038] Figures 2, 3 and 4 are schematic diagrams of the structure of a carbon product sintering furnace in a preferred embodiment of this application;

[0039] Figure 5 is a comparative schematic diagram showing the roasting curve of a carbon product sintering system according to an embodiment of this application and the prior art solution.

[0040] Figures 6 and 7 are schematic flowcharts of a carbon product sintering method according to an embodiment of this application; and

[0041] Figures 8 and 9 are schematic diagrams of the structure of a roasting furnace in the prior art. Detailed Implementation

[0042] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are merely some examples or embodiments of this application. For those skilled in the art, these drawings can be applied to other similar scenarios without creative effort. Unless obvious from the context or otherwise specified, the same reference numerals in the drawings represent the same structures or operations.

[0043] As indicated in this application and claims, unless the context clearly indicates otherwise, the words "a," "an," "an," and / or "the" are not specifically singular and may include plural forms. Generally speaking, the terms "comprising" and "including" only indicate the inclusion of explicitly identified steps and elements, which do not constitute an exclusive list, and the method or apparatus may also include other steps or elements.

[0044] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps described in these embodiments do not limit the scope of this application. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following drawings denote similar items; therefore, once an item is defined in one drawing, it need not be further discussed in subsequent drawings.

[0045] In the description of this application, it should be understood that the orientation or positional relationship indicated by directional terms such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" is usually based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing this application and simplifying the description. Unless otherwise stated, these directional terms do not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the scope of protection of this application; the directional terms "inner" and "outer" refer to the inner and outer contours relative to the outline of each component itself.

[0046] For ease of description, spatial relative terms such as "above," "on top of," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "on top of" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0047] Furthermore, it should be noted that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, these terms have no special meaning and therefore should not be construed as limiting the scope of protection of this application. In addition, although the terminology used in this application is selected from commonly known and used terms, some terms mentioned in this application's specification may have been chosen by the applicant according to his or her judgment, and their detailed meanings are explained in the relevant sections of this description. Moreover, this application should be understood not only through the actual terms used, but also through the meaning implied by each term.

[0048] 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, coupled to, or in contact with that 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 between the first and second components that allows current to flow. This electrical path may include capacitors, coupled inductors, and / or other components that allow current to flow, even if there is no direct contact between the conductive components.

[0049] One embodiment of this application, with reference to FIG1, discloses a carbon product sintering system 10, including a carbon product sintering furnace 11, a power supply 12, and a power control device 13. The carbon product sintering furnace 11 includes a furnace body 110, within which one or more green blanks 1101 to be sintered are placed. The green blanks 1101 are surrounded by a resistive material 1102, and the resistive material 1102 contains one or more thermocouples 1103. The thermocouples 1103 are adapted to receive temperature signals from the furnace body 110 and transmit these temperature signals to the transformer control device 13. Further, in this embodiment, the power supply 12 is preferably implemented as a transformer, or particularly as a rectifier transformer. Therefore, the following description is based on this preferred embodiment, referring to the power supply 12 as a transformer 12 and the power control device 13 as a transformer control device 13. However, this does not constitute a limitation on the selection of the types of power supply and power control device in different embodiments of this application. Specifically, transformer 12 is adapted to supply power to carbon product sintering furnace 11 according to electrical output parameters, thereby heating the resistance material 1102 to sinter the green blank 1101, forming a sintered carbon product after reaching a certain temperature. Preferably, the electrical output parameters include an output current of 30,000 to 80,000 amperes and / or an output voltage of 15 volts to 120 volts. Finally, transformer control device 13 is adapted to receive temperature signals when carbon product sintering furnace 11 is operating, and control transformer 12 to adjust electrical output parameters according to the temperature signals, so that furnace body 110 heats up and sinters according to the roasting curve corresponding to green blank 1101. The roasting curve will be further explained later with reference to Figure 5.

[0050] In the carbon product sintering system 10, the high-temperature electric sintering method, which generates heat through resistance material, can improve the sintering quality and stability of the carbon products. Furthermore, by using the temperature signal provided by the thermocouple 1103 to adjust the electrical output parameters of the transformer 12 in real time, different parts of a single green billet 1101, or multiple green billets 1101, within the furnace body 110 can be heated and sintered in a relatively uniform manner. Taking multiple green billets 1101 as an example, the carbon product sintering system 10 can effectively avoid the problem of low product quality and yield due to large temperature differences between different parts of the green billets 1101 within the furnace body 110. In addition, because the heating method is relatively uniform, the sintering effect can be achieved in a shorter overall firing time, thus reducing production time and costs. The carbon product sintering system 10 can achieve good sintering results and significantly improve the yield of carbon products for any type of carbon product, even special carbon products in the high-precision field and even large-sized special carbon products (such as isostatic graphite with dimensions greater than 500mm), while reducing production costs. For example, for existing large-sized carbon products or carbon-graphite products, especially those with a length greater than 2 meters, a width of about 0.7 meters, and a thickness of about 0.5 meters, the solution of this application has a significant improvement effect on sintering quality. For such large-sized specifications, such as the aforementioned examples with long lengths, the solution of this application can achieve uniform sintering at all positions of a single green body, and can also achieve uniform sintering of multiple green bodies in the furnace.

[0051] Further preferably, the carbon product sintering furnace 11 shown in Figure 1 can be specifically implemented as the structure and construction of the carbon product sintering furnace 20 described in this application with reference to Figures 2 to 4, thereby further improving the sintering effect of carbon products and improving the yield. Specifically, Figures 2, 3, and 4 are respectively a top view cross-sectional view, a front view partial transverse cross-sectional view, and a side view partial longitudinal cross-sectional view of the carbon product sintering furnace 20. Specifically, referring to Figures 2 to 4, the carbon product sintering furnace 20 includes a furnace head area 21 and a furnace tail area 22 (shown in both Figures 2 and 3), a furnace body 23 (shown in both Figures 2 to 4), a furnace top area 24 (shown in Figure 4, and a portion of the furnace top area 24 shown in Figure 3), and a transformer 251 and a conductor 252 (shown in both Figures 2 and 3). In addition, Figure 2 also shows a transformer control device 250, which is adapted to receive a temperature signal from the furnace body 23 when the carbon product sintering furnace 20 is working, and to control the transformer 251 to adjust the electrical output parameters according to the temperature signal so that the furnace body 23 heats up according to the set roasting curve, thereby completing the product sintering process in a better way.

[0052] Specifically, according to Figure 2, the furnace body 23 has a furnace head area 21 and a furnace tail area 22 on each of its left and right sides. Conductive electrodes are also present in the furnace head area 21 and furnace tail area 22 on both sides of the furnace body 23. The furnace head area 21 includes a head conductive electrode 210, and the furnace tail area 22 includes a tail conductive electrode 220. The conductor 252 can be a copper busbar or an aluminum busbar, and is suitable for connecting the head conductive electrode 210 and the transformer 251, and the tail conductive electrode 220 and the transformer 251. Furthermore, in the operating state, multiple green billets 230 are placed in the furnace body 23, and the area of ​​the furnace body 23 outside the green billets 230 is filled with a resistance material 231. Referring to Figure 4, the resistance material 231 also has multiple thermocouples 29, which are suitable for feeding back temperature signals from the furnace body 23.

[0053] In this embodiment, preferably referring to Figures 2 and 3, the furnace head area 21 and furnace tail area 22 on both sides of the furnace body 23 further include conductive walls 253. The resistive material 231 is adapted to be electrically connected to the head conductive electrode 210 and the tail conductive electrode 220 through the conductive walls 253. Since the head conductive electrode 210 and the tail conductive electrode 220 are smaller in size than the furnace body 23, the conductive walls 253 can increase the contact area between the resistive material 231 and the conductive components, thereby improving the problem of uneven current. In this embodiment, since the carbon product sintering furnace 20 needs to operate in a high-temperature environment (e.g., greater than 1200 degrees Celsius), the head conductive electrode 210, the tail conductive electrode 220, and the conductive walls 253 are preferably all composed of high-temperature resistant graphite materials, and this application does not limit the use of such graphite materials.

[0054] In this embodiment, according to Figures 2-4, the carbon product sintering furnace 20 further includes a refractory furnace wall 26. In this embodiment, the refractory furnace wall 26 preferably surrounds the furnace body 23, the furnace head area 21, and the furnace tail area 22, wherein the refractory furnace wall 26 is used to protect the working areas therein. In other embodiments of this application, depending on the different process implementation scenarios, the refractory furnace wall may only partially surround the furnace body, and other materials or structures may be used for protection in other areas without furnace walls; this application does not impose any limitations on this. Preferably, the refractory furnace wall 26 in this embodiment is made of clay primarily composed of alumina. More preferably, referring to Figures 3 and 4, the carbon product sintering furnace 20 in this embodiment also has a base 27, preferably made of concrete, located below the furnace body 23. By setting the base 27, the load-bearing capacity can be increased, ensuring that the overall furnace structure of the carbon product sintering furnace 20 does not deform. In this embodiment, preferably, the carbon product sintering furnace 20 may also include a support frame. For example, a steel support frame (not shown in the figure) may be used and fixedly connected to the furnace wall 26, thereby improving the overall stability of the carbon product sintering furnace 20.

[0055] Referring further to Figure 4, the furnace top area 24 includes a furnace cover 241, which has a through exhaust channel 240. Preferably, in this embodiment, the furnace cover 241 is made primarily of high-alumina (Al2O3) refractory castable, with a weight sufficient to exert a pressure of 2 to 6 tons per square meter on the charging material (i.e., the resistance material 231 in the furnace body 23 and the green billets 230 to be sintered). With this arrangement, the furnace cover 241 can apply sufficient pressure to the furnace body 23, thereby preventing the green billets 230 from cracking during sintering and improving the yield. According to Figures 2 to 4, in this embodiment, there are multiple green billets 230. Preferably, the multiple green billets 230 are arranged at a uniform spacing in the furnace body 23. Furthermore, to obtain better preparation results, in a preferred embodiment, the spacing between each pair of adjacent green billets 230 is 45 mm to 55 mm.

[0056] In this embodiment, the working principle of the carbon product sintering furnace 20 is as follows. First, the green billet 230 to be sintered (e.g., a special carbon pressed billet) is uniformly loaded into the furnace body 23, and the green billet 230 is uniformly filled with a certain particle size of resistance material 231. The transformer 251 is started to supply power to the furnace body 23, and the resistance material 231 heats up under the action of current. The heat is directly used to heat the green billet 230, thereby achieving the purpose of sintering. In this embodiment, preferably, the uniformity of the electrical properties of the resistance material 231 can be achieved by controlling the electrical properties of the resistance material 231. For example, the electrical properties of the resistance material 231 at different positions in the furnace body 23 are consistent or within the same value range, and it is uniformly filled around the green billet 230, thereby achieving uniform heat generation and uniform heating of the green billet.

[0057] Furthermore, in this embodiment, more preferably, the carbon product sintering furnace 20 also includes an insulating layer 28. Referring to Figures 3 and 4, the insulating layer 28 is preferably located above and below the furnace body 23. However, this application is not limited thereto. In different embodiments of this application, the insulating layer may be located only above the furnace body to isolate the furnace body from air and pressurize it; and in some cases, the insulating layer may be located above and below the furnace body simultaneously, or simultaneously above, below, and around the furnace body, thereby making the furnace body better insulated from the outside.

[0058] In this embodiment, to achieve a better firing effect, it is preferable to set the pressure provided by the furnace lid 241 to the insulation layer 28 from top to bottom to the green billet 230 and the surrounding resistance material 231 to be 2 to 6 tons per square meter. As mentioned above, using a high-alumina refractory material for the furnace lid 241 can increase the pressure of the furnace lid 241, thereby enabling better pressurized firing of the green billet 230 to be sintered.

[0059] In this embodiment, the resistive material 231 includes a first type of coke particles with a particle size of 5mm to 8mm, which includes calcined petroleum coke particles and / or graphitized coke particles. Simultaneously, the insulating layer 28 includes a second type of coke particles with a particle size of 0 to 2mm, which also includes calcined petroleum coke particles and / or graphitized coke particles. Specifically, the raw material for the calcined petroleum coke particles is coke, specifically coke particles treated at 1300 degrees Celsius; while the raw material for the graphitized coke particles is also coke, specifically coke particles treated at 2500 degrees Celsius. Both the first and second types of coke particles in this application can be freely selected from these two materials.

[0060] In this embodiment, preferably, the content of the second type of coke particles with a particle size of less than 0.5 mm in the insulation layer 28 is no more than 40%. This setting can avoid the risk of dust explosion due to small particle size and improve safety. More preferably, as shown in FIG4, the insulation layer 28 also includes a first type of coke particles with a particle size of 5 mm to 8 mm. The first type of coke particles form a coarse coke particle region 281 with a diameter of 250 mm to 500 mm in the insulation layer 28. When the furnace body 23 is working, it generates flue gas, and the coarse coke particle region 281 corresponds to the exhaust channel 240 in the furnace cover 241 in the direction of flue gas flow. The fine coke particle region 282 outside the coarse coke particle region 281 of the insulation layer 28 uses the aforementioned second type of coke particles of 0 to 2 mm, thereby achieving the effect of isolating the furnace body 23 from the outside air and heat preservation. In addition, the weight of the furnace cover 241 pressurizes the furnace body 23 to achieve pressurized electric roasting. In this way, the flue gas generated during the pressurized roasting process can be directly transported through the channels in the insulation layer without the need for additional exhaust gas collection devices, thus saving production costs.

[0061] In this embodiment, the furnace cover 241 is made into a heavy block (i.e., a gravity furnace cover). While collecting flue gas through the exhaust channel 240, the weight of the furnace cover 241, through the insulation layer 28 and the resistance material 231 filled around the green blank 230, provides a continuous pressure to the green blank 230 during the sintering process. This counteracts the expansion force generated from the inside to the outside of the green blank 230 when the asphalt flue gas is discharged, as well as the thermal expansion force generated when it is heated. This promotes the rearrangement of particles in the green blank 230, reduces the possibility of cracking, and increases the final sintering density of the product, thereby improving the sintering quality.

[0062] Referring further to Figure 4, in this embodiment, preferably, a plurality of thermocouples 29 are also included, distributed within the resistive material 231 inside the furnace body 23. For example, a temperature signal can be fed back to the transformer control device 250 as shown in Figure 2. After receiving the temperature signal, the transformer control device 250 can further control the transformer 251 to adjust the output voltage / current, so that the various products 230 to be baked within the furnace body 23, or different parts of the same product 230 to be baked, can be heated uniformly. In this embodiment, preferably referring to Figure 4, the plurality of thermocouples 29 include a temperature-controlling thermocouple 291 located at the center of the furnace body 23, and temperature-measuring thermocouples 292 distributed in other areas of the furnace body 23. In this embodiment, the transformer control device 250, as shown in FIG2, is configured to receive a first temperature signal containing the controlled temperature from the temperature-controlling thermocouple 291, and a second temperature signal containing the measured temperature from multiple temperature-measuring thermocouples 292. It calculates the temperature difference between the controlled temperature and each measured temperature, and controls the transformer 251 to adjust its electrical output parameters based on a comparison between the temperature difference and a threshold. Specifically, the controlled temperature can be understood as representing the operating temperature of the furnace body 23, or the set temperature at any given moment in the roasting curve of the corresponding carbon product. For example, the temperature corresponding to the threshold can be in the range of 4% to 10% of the controlled temperature, preferably 5%. For instance, if the controlled temperature at a certain moment is 1000 degrees, then the threshold can be selected between 40 degrees and 100 degrees.

[0063] Specifically, as shown in Figure 2, the transformer control device 250 can be further configured such that when the temperature difference between the controlled temperature and the measured temperature is higher than a threshold, the transformer control device 250 controls the transformer 251 to maintain the current electrical output parameters unchanged until the temperature difference is lower than or equal to the threshold; on the other hand, when the temperature difference is lower than or equal to the threshold, the transformer 251 is controlled to adjust the electrical output parameters so that the furnace body 23 of the carbon product sintering furnace 20 continues to heat up. In this embodiment, preferably, the transformer 251 is configured as an on-load adjustable voltage switch with more than 200 levels, and the transformer 251 is suitable for adjusting the electrical output parameters through the on-load adjustable voltage switch. As described above with reference to Figure 1, the electrical output parameters of the transformer 251 preferably include an output current of 30,000 to 80,000 amperes; and / or an output voltage of 15 volts to 120 volts. When using an on-load adjustable voltage switch with more than 200 levels, for example, the output voltage of transformer 251 can be finely adjusted in more than 300 levels within the voltage range of 15V to 120V. This allows the change in output current to more accurately match the heating requirements of green billet 230, and enables rapid and precise increase of the firing temperature at a local location when the local heating does not meet the process requirements.

[0064] To better understand the feedback regulation mechanism of thermocouple 29 described above, an example is given below with reference to Figure 4. According to Figure 4, consider the green billet 2301 located in the central region of furnace body 23 and the green billet 2302 located in the bottom region of furnace body 23 as examples. During the heating process of furnace body 23, at a certain time t, transformer control device 250 receives a first temperature signal containing the controlled temperature T1 transmitted from temperature-controlling thermocouple 291, and a second temperature signal containing the measured temperature T2 transmitted from temperature-measuring thermocouple 292 near green billet 2302. The controlled temperature T1 at time t is 800 degrees Celsius, representing the overall temperature of furnace body 23. Specifically, according to the roasting curve of the carbon product, the set temperature corresponding to time t is 800 degrees Celsius. Therefore, the output current / output voltage of transformer 251 is first controlled to make the temperature inside furnace body 23 reach 800 degrees Celsius. If the output parameters of transformer 251 remain unchanged at this time, the controlled temperature T1 remains unchanged during the period near time t. That is, during this period, the heating temperature inside furnace body 23 is maintained at around 800 degrees Celsius. Additionally, it is assumed that the threshold used for temperature difference comparison is 5% of the controlled temperature T1, which is 40 degrees Celsius.

[0065] Furthermore, at time t, when the temperature measuring thermocouple 292 detects that the temperature measuring temperature T2 is 750 degrees Celsius, and the temperature difference of 50 degrees Celsius between it and the controlled temperature T1 has exceeded the threshold of 40 degrees Celsius, the transformer control device 250 controls the transformer 251 to maintain the heating temperature at the controlled temperature T1 of 800 degrees Celsius based on this comparison result, until the temperature measuring thermocouple 292 detects that the temperature difference between the temperature measuring temperature T2 near the green blank 2302 and the controlled temperature T1 is less than or equal to 40 degrees Celsius. At this time, the electrical output parameters of the transformer 251 are adjusted to make the furnace body 23 continue to heat up according to the roasting curve of the carbon product until the green blank 230 inside reaches the final high-temperature sintering requirements.

[0066] Through the aforementioned control method, before a significant temperature difference appears in different areas within the furnace body 23, the electrical output parameters of the transformer 251 are controlled in a timely manner. This allows the furnace body 23 to maintain its current temperature level until the temperatures in all areas within the furnace body 23 become uniform before further heating. This enables each green billet 230 in the carbon product sintering furnace 20 to heat up according to an improved roasting curve. Specifically, the roasting curve includes a functional relationship between roasting time and roasting temperature. For example, Figure 5 shows a comparison between the set roasting curve A of the carbon product sintering system 20 for the heating and sintering process of multiple green billets 230 and the set roasting curve B of the product in the prior art carbon product sintering process. Using the prior art method to execute the sintering process, the internal product has an ideal roasting curve B, where a temperature deviation of + / -5% is allowed in multiple different sintering processes. Therefore, the overall sintering effect can vary within the range formed by curves B1 and B2. In this application, the carbon product sintering system 20 allows the green billets 230 to heat up according to the improved ideal roasting curve A. Similarly, in actual multiple sintering processes, a temperature deviation of + / -5% is allowed. Therefore, the overall sintering effect of the carbon product sintering system 20 can vary within the range formed by curves A1 and A2. A comparison shows that, compared to sintering curve B, sintering curve A requires a shorter sintering time to achieve the same final sintering temperature. This is because, after feedback adjustment using thermocouple 29, multiple green blanks 230 in various areas of the furnace body 23 can be heated and sintered in a more consistent and uniform manner, with smaller temperature deviations near each green blank 230, thus avoiding the large waiting time caused by large temperature differences. Furthermore, it also improves issues such as product cracking during firing, thereby optimizing the original sintering curve B, reducing production costs while improving product quality.

[0067] In Figure 4 of this application, temperature-measuring thermocouples 292 are respectively arranged at the upper and lower parts of the furnace body 23, thereby enabling a comprehensive view of the temperature distribution within the furnace body 23 and facilitating control of the firing temperature. Of course, this application does not limit the number of thermocouples or their arrangement within the furnace body. In other embodiments, more or fewer temperature-measuring thermocouples may be used. Preferably, after the current electric sintering process is completed, experience can be summarized to determine which parts of the furnace body 23 are prone to significant temperature differences compared to other areas. In the next firing process, temperature-measuring thermocouples can be strategically placed in areas prone to temperature differences to further optimize the firing curve.

[0068] In this embodiment, a thermocouple 29 is inserted into the resistive material 231 and connected to the transformer control device 250. The temperature signal is transmitted to the transformer control device 250. The transformer control device 250 performs a fine comparison between the collected temperature signal and a set calcination curve (e.g., calcination curve A as shown in Figure 5), and then sends a signal command to the transformer 251 according to the judgment strategy described above. This command either maintains the existing electrical output parameters or changes the electrical output parameters to continue heating according to the calcination curve. Preferably, the transformer 251 can be a special adjustable voltage rectifier transformer and equipped with a 300-level or higher on-load adjustable voltage switch to achieve voltage fine-tuning and ensure that the heat generated by the resistive material 231 at each time period meets the heating requirements. In this embodiment, a temperature-controlling thermocouple 291 is preferably installed at the center of the furnace body 23. The temperature signal monitored by the temperature-controlling thermocouple 291 is connected to the transformer control device 250 as a control signal source. Multiple temperature-measuring thermocouples 292 are installed in other different areas of the furnace body 23. The temperature signals monitored are also connected to the transformer control device 250. When the temperature difference between the measured temperature and the set temperature rise curve exceeds the allowable range, the transformer control device 250 automatically adjusts the power supply and power supply time to compensate for the deficiency caused by the temperature difference.

[0069] By linking thermocouples 29 installed in the resistance material 231 surrounding the green billet 230 with transformer 251, and through feedback adjustment via transformer control equipment 250, the transformer 251 is automatically controlled to supply power to the carbon product sintering furnace 20 in real time according to the adjusted electrical output parameters. This allows for easy temperature rise according to the improved product roasting curve. During the sintering heating process, the temperature near the green billet 230 at different locations rises at a basically consistent rate, thus eliminating the need to extend the sintering curve due to uneven temperature or failure to reach the required roasting curve. This improves the sintering quality of the product while reducing costs.

[0070] In this field, the purpose of carbon product sintering is to sinter the pitch in the product into coke during the heating process, combining it with the coke in the product itself. Taking special carbon products in graphitized products as an example, the principle for formulating the roasting curve of existing special carbon product production is to achieve pitch coking with the aim of preventing cracking of the product during roasting. Using the carbon product sintering system of this application to produce the same type of special carbon products can not only greatly increase the roasting heating rate, but also strictly control the temperature difference in the entire furnace and the temperature difference of individual products, greatly improving the quality and yield of the products; at the same time, it can also improve the roasting curve according to the sintering performance of the pitch in the carbon product, so that the coke produced by the pitch coking under a reasonable sintering curve has the same properties as the raw material coke, further improving the product performance. The main raw materials for special carbon products are coal coking and the residue oil from petroleum refining (similar to the commonly referred to pitch). Coke is obtained by coking at high temperature, and the residue oil is heated to a high temperature (above 1000℃) in a short time and then coked under pressure, resulting in high-quality coke. In existing technologies, the roasting curves for producing special carbon products are prone to cracking due to uneven product heating temperatures. For example, some areas of the furnace may have higher temperatures while others are lower, making it impossible to ensure that all products are heated strictly according to the set roasting curve or its allowable error range (e.g., curves B1, B, and B2 as shown in Figure 5) within the same time period. This results in a slow heating rate, a low conversion rate of asphalt to coke, and insufficient conversion into flue gas for emission. In the preferred embodiment of this application, after real-time monitoring and feedback adjustment of the furnace temperature, the output voltage of the transformer is adjusted using an on-load adjustable voltage switch with more than 200 levels. Due to the high number of voltage adjustment levels, the sintering temperature can be controlled more precisely. By comparing curves A and B as shown in Figure 5, this application can use the improved roasting curve A for product sintering. Compared to using the existing curve B, this shortens the roasting curve (i.e., shortens the sintering time), thereby increasing the coking rate of the asphalt and improving product quality. Practical experience has shown that using the carbon product sintering system of this application to sinter carbon products can shorten the sintering curve by 30% and increase the pitch coking rate by 2% when sintering the same products.

[0071] In summary, the carbon product sintering system proposed in the above embodiments of this application can significantly improve product quality and reduce production costs. The improved electric sintering method of this application has the following advantages: 1) During product sintering, the temperature can be raised strictly according to the set baking curve, and multiple products can be heated synchronously during the sintering process, shortening the overall heating time of the baking curve; 2) Under the premise that the quality of the green body is stable, that is, the structural performance is guaranteed, the sintering yield can basically be 100%; 3) During the sintering process, by designing the quality of the furnace lid, the products in sintering are sintered under a set pressure, and the generated asphalt volatile gases can be smoothly discharged through the exhaust channel without causing safety hazards; 4) The asphalt fumes discharged from the furnace body can be collected and treated by a special collection device and used as a heating source for the heat transfer oil during green body production, improving energy utilization efficiency and further reducing costs.

[0072] To better understand the carbon product sintering system described above, another aspect of this application, referring to FIG6, proposes a carbon product sintering method 30, applicable to a carbon product sintering system having a carbon product sintering furnace, a power supply, and power control equipment. Exemplarily, this carbon product sintering system can be any of the carbon product sintering systems proposed in any embodiment of this application, and appropriate modifications can also be made based on the carbon product sintering system proposed in this application. FIG6 in this application uses a flowchart to illustrate the operations performed by the system according to an embodiment of this application. It should be understood that the preceding or following operations are not necessarily performed precisely in sequence. Instead, various steps can be processed in reverse order or simultaneously. Simultaneously, other operations may be added to these processes, or one or more steps may be removed from these processes.

[0073] According to Figure 6, the carbon product sintering method 30 includes the following steps: Step S1 is to load one or more green blanks to be sintered into the furnace body of the carbon product sintering furnace, and simultaneously fill resistance material around the green blanks; Step S2 is to place one or more thermocouples in the resistance material, the thermocouples being adapted to provide feedback on temperature signals from the furnace body; Step S3 is to start the transformer control equipment and the transformer to enable the carbon product sintering system to start working; Step S4 is to receive the temperature signal through the transformer control equipment and control the transformer to adjust the electrical output parameters according to the temperature signal; Step S5 is to supply power to the carbon product sintering furnace through the transformer according to the electrical output parameters, thereby heating the resistance material to sinter the green blanks.

[0074] Preferably, in this application, the carbon product sintering method 30 further includes loading multiple green blanks to be sintered into the furnace body at a uniform spacing. More preferably, in order to obtain a uniformly performing resistance material, the method further includes sieving and mixing the raw materials of the resistance material before loading them in. Specifically, in this application, the resistance material preferably includes calcined petroleum coke particles and / or graphitized coke particles. Since calcined petroleum coke particles and / or graphitized coke particles from different sources and batches have different characteristics, the sieving and mixing operations can ensure that the electrical properties of the resistance material loaded into the same furnace body are consistent at all locations, thereby ensuring that all locations in the furnace body are heated uniformly and guaranteeing the sintering quality.

[0075] Preferably, in this application, the step of placing one or more thermocouples in the resistance material further includes: placing the thermocouples while filling the resistance material; or placing a protective tube while filling the resistance material, and placing one or more thermocouples in the corresponding protective tube before starting the transformer control equipment and the transformer. This application does not limit the method of placing the thermocouples.

[0076] Furthermore, in this application, the multiple thermocouples inside the furnace body include a temperature-controlling thermocouple located at the center of the furnace body and one or more temperature-measuring thermocouples distributed in other areas of the furnace body. Based on this, step S4 in the carbon product sintering method 30 further includes the following steps:

[0077] Step S41 involves receiving a first temperature signal, including the controlled temperature, from the temperature-controlling thermocouple, and a second temperature signal, including the measured temperature, from multiple temperature-measuring thermocouples. Step S42 involves calculating the temperature difference between the controlled temperature and each measured temperature. Step S43 involves determining the relationship between the temperature difference and a threshold value. If the temperature difference is higher than the threshold, step S44 is executed, controlling the transformer to maintain its current electrical output parameters and returning to step S41 to detect the temperature signal until the temperature difference is lower than or equal to the threshold. If the determination result of step S43 is negative, step S45 is executed, controlling the transformer to adjust the electrical output parameters to continue heating the furnace body of the carbon product sintering furnace.

[0078] More preferably, the carbon product sintering method 30 may further include, during the current green body sintering process, recording the temperature deviation where the temperature difference between the measured temperature and the controlled temperature fed back by each thermocouple exceeds a threshold, and adjusting the position of the thermocouples in the furnace body according to the temperature deviation during the next green body sintering process. In this way, the firing curve can be further optimized after multiple sintering cycles, continuously improving the process effect.

[0079] Another aspect of this application provides a carbon product sintered using the carbon product sintering method of any embodiment of this application (e.g., the carbon product sintering method 30 described above). Based on this, this application further proposes a carbon-graphite product obtained by subjecting the aforementioned carbon product to an impregnation-baking process and a graphitization process. Such a carbon-graphite product, compared to some existing ordinary graphitized products on the market, possesses superior properties and can be understood as a new product in the field of special carbon within the graphitization field.

[0080] Preferably, the impregnation and baking process includes impregnation and secondary electric calcination; additionally, the graphitization process includes steps such as high-temperature graphitization treatment, wherein the high-temperature graphitization treatment temperature is above 2500 degrees Celsius. Specific graphitization processes can refer to some conventional steps of existing graphitization processes, which are not the focus of this application and will not be elaborated here. More preferably, the carbon graphite products obtained by the above methods proposed in this application include special carbon products. These special carbon graphite products include isostatically pressed graphite. Preferably, the size of such special carbon graphite products is 500 mm or larger. That is to say, the carbon graphite products obtained using the process method proposed in this application can achieve high-quality and high-yield production of large-size special carbon products. For example, such carbon graphite products preferably have the following excellent product characteristics: a resistivity range of 9 μ ohms to 12 μ ohms, and / or a density of 1.8 g / cc to 1.85 g / cc.

[0081] Due to the limitations of current technologies, it is difficult to prepare large-size special carbon products from a process perspective, often resulting in product cracking and very low yield. The improved process equipment and methods described in this application significantly improve this situation. Therefore, the resistivity of the carbon-graphite products of this application can range from 9 μΩ to 12 μΩ, and / or the density of the carbon-graphite products can range from 1.8 g / cc to 1.85 g / cc. Optionally, the size of the carbon-graphite products can be 500 mm or larger. Of course, this application is not limited to this. Although this application has significant advantages in improving the yield of large-size special carbon products, in some embodiments of this application, the carbon product sintering furnace proposed in this application can also be used to prepare other carbon products that do not require high-temperature graphitization treatment, achieving similarly good preparation results. Such carbon products include graphite electrodes, graphite cathodes, prebaked anode materials, regenerated crucibles, etc.

[0082] To better understand the beneficial effects of this application, examples of prior art roasting furnaces are provided below. Figures 8 and 9 show examples of prior art ring-type roasting furnaces, which have many drawbacks in actual production applications. Referring specifically to Figure 8, the covered ring-type roasting furnace 40 includes a refractory brick firewall 41, filler material 42, and carbon products 43. The roasting principle of this furnace 40 is as follows: the hot flue gas generated by the combustion of fuel gas (natural gas, coal gas) on the waste heat flue gas from the previous furnace transfers heat energy through the furnace wall to the filler material surrounding the carbon products 43, and then the filler material 42 heats and roasts the products. The shortcomings of this roasting furnace are: (1) low heat transfer efficiency. The heat from the flue gas passes through the furnace wall and is then transferred to the filler, which then heats and roasts the product. The heat transfer path is long and the thermal conductivity is poor. (2) temperature control is difficult. The flue gas temperature and the product temperature are not synchronized. It is difficult to measure and control the flue gas temperature in production to meet the heating regime required by the product. (3) the flue gas flow rate and temperature determine the amount of roasting heat provided, which is basically not effectively controlled. (4) in actual production, large-sized products have large temperature differences between the top and bottom due to their large height. (5) the above-mentioned unfavorable factors result in the need for an ultra-long roasting curve to meet the deficiencies of poor thermal conductivity and inaccurate temperature control. The product is prone to cracking, resulting in a low yield. The roasting temperature of different parts of large-sized products varies greatly, resulting in large quality differences after roasting. Parts of the product in the low-temperature region may not be roasted properly and are prone to secondary cracking during graphitization.

[0083] Based on this, Figure 9 shows an improved annular calcining furnace 50 based on Figure 8, with an overall view of the heat-resistant metal crucible 51, the filler 52, and the calcined product 53. As can be seen from the structural diagram, the annular calcining furnace 50 significantly improves heat transfer performance, heat transfer efficiency, and temperature control compared to the covered annular calcining furnace 40, resulting in a substantial increase in product quality and yield. However, it still retains the inherent shortcomings of annular calcining furnaces (uncontrollable flue gas temperature around the metal crucible, uncontrollable flue gas flow velocity, and indirect heating of the product through the crucible and filler, etc.).

[0084] In traditional roasting furnaces, the asphalt fumes discharged are mixed with a large amount of air when collected through the furnace lid. This not only reduces the quality of the fuel used but also increases the risk of explosions. Typically, the fumes are incinerated and purified, with very little heat recovery. Furthermore, the furnace cannot pressure-roast the products inside, nor can it effectively utilize the internal space to collect the asphalt fumes and adjust the temperature after pressure roasting. Therefore, compared to traditional roasting furnaces, the carbon product sintering system and method proposed in this application effectively improve upon these shortcomings.

[0085] The basic concepts have been described above. Obviously, for those skilled in the art, the above disclosure is merely illustrative and does not constitute a limitation of this application. Although not explicitly stated herein, those skilled in the art may make various modifications, improvements, and corrections to this application. Such modifications, improvements, and corrections are suggested in this application, and therefore remain within the spirit and scope of the exemplary embodiments of this application.

[0086] Furthermore, this application uses specific terms to describe embodiments of the application. For example, "an embodiment," "one embodiment," and / or "some embodiments" refer to a particular feature, structure, or characteristic related to at least one embodiment of the application. Therefore, it should be emphasized and noted that "an embodiment," "one embodiment," or "an alternative embodiment" mentioned twice or more in different locations in this specification do not necessarily refer to the same embodiment. In addition, certain features, structures, or characteristics in one or more embodiments of the application can be appropriately combined.

[0087] Some aspects of this application, such as transformer control equipment, can be executed entirely by hardware, entirely by software (including firmware, resident software, microcode, etc.), or by a combination of hardware and software. The aforementioned hardware or software can all be referred to as a "data block," "module," "engine," "unit," "component," or "system." The processor can be one or more application-specific integrated circuits (ASICs), digital signal processors (DSPs), digital signal processing devices (DAPDs), programmable logic devices (PLDs), field-programmable gate arrays (FPGAs), processors, controllers, microcontrollers, microprocessors, or combinations thereof. Furthermore, aspects of this application may manifest as computer products residing in one or more computer-readable media, including computer-readable program code. For example, computer-readable media may include, but are not limited to, magnetic storage devices (e.g., hard disks, floppy disks, magnetic tapes, etc.), optical discs (e.g., compressed CDs, digital multifunction DVDs, etc.), smart cards, and flash memory devices (e.g., cards, sticks, key drives, etc.).

[0088] A computer-readable medium may contain a propagated data signal containing computer program code, for example, on baseband or as part of a carrier wave. This propagated signal may take various forms, including electromagnetic, optical, and so on, or suitable combinations thereof. A computer-readable medium can be any computer-readable medium other than a computer-readable storage medium, which can be connected to an instruction execution system, apparatus, or device to enable communication, propagation, or transmission of a program for use. The program code located on the computer-readable medium can be propagated through any suitable medium, including radio, cable, fiber optic cable, radio frequency signals, or similar media, or any combination of the above media.

[0089] Similarly, it should be noted that, in order to simplify the description of the present application and thus aid in the understanding of one or more embodiments, the foregoing description of the embodiments of the present application sometimes combines multiple features into a single embodiment, drawing, or description thereof. However, this disclosure method does not imply that the subject matter of the present application requires more features than those mentioned in the claims. In fact, the embodiments contain fewer features than all the features of the single embodiments disclosed above.

[0090] In some embodiments, numbers describing the quantity of components and attributes are used. It should be understood that such numbers used in the description of embodiments are modified in some examples with the terms "approximately," "approximately," or "generally." Unless otherwise stated, "approximately," "approximately," or "generally" indicates that the numbers are allowed to vary by ±20%. Accordingly, in some embodiments, the numerical parameters used in the specification and claims are approximate values, which may be changed depending on the characteristics required by individual embodiments. In some embodiments, numerical parameters should take into account specified significant digits and employ a general method of digit reservation. Although the numerical ranges and parameters used to confirm their breadth of scope in some embodiments of this application are approximate values, in specific embodiments, such values ​​are set as precisely as feasible.

[0091] Although this application has been described with reference to specific embodiments, those skilled 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, any changes or modifications to the above embodiments within the essential spirit of this application will fall within the scope of the claims of this application.

Claims

1. A carbon product sintering system, characterized in that, include: A carbon product sintering furnace, including a furnace body for accommodating one or more green billets to be sintered, wherein the green billets are surrounded by a resistive material; One or more thermocouples are adapted to be arranged in the resistive material, and the thermocouples are adapted to provide feedback of temperature signals from the furnace body; A power supply adapted to supply power to the carbon product sintering furnace according to electrical output parameters, thereby heating the resistance material to sinter the green body; And a power control device, adapted to receive the temperature signal when the carbon product sintering furnace is in operation.

2. The system as described in claim 1, characterized in that, In the carbon product sintering furnace, conductive electrodes are also provided on both sides of the furnace body, and the power supply supplies power to the carbon product sintering furnace through the conductive electrodes.

3. The system as described in claim 2, characterized in that, In the carbon product sintering furnace, the furnace body also has conductive walls on both sides, and the resistive material is adapted to be electrically connected to the conductive electrode through the conductive walls.

4. The system as described in claim 2, characterized in that, The carbon product sintering furnace also includes a copper busbar or an aluminum busbar, which is adapted to be connected between the conductive electrode and the power source.

5. The system as described in claim 1, characterized in that, The electrical output parameters include an output current of 30,000 to 80,000 amperes and / or an output voltage of 15 to 120 volts.

6. The system as described in claim 1, characterized in that, The carbon product sintering furnace also includes a refractory furnace wall, which at least partially surrounds the furnace body, wherein the refractory furnace wall is made of clay.

7. The system as described in claim 6, characterized in that, The carbon product sintering furnace also includes a support frame, which is fixedly connected to the furnace wall.

8. The system as described in claim 1, characterized in that, The carbon product sintering furnace also includes a base located below the furnace body.

9. The system as described in claim 1, characterized in that, The resistive material includes a first type of coke particles with a particle size of 5mm to 8mm, which includes calcined petroleum coke particles and / or graphitized coke particles.

10. The system as claimed in claim 1, characterized in that, The sintering furnace also includes a furnace cover located above the furnace body. The furnace cover is a gravity furnace cover, which is configured to provide a pressure of 2 to 6 tons per square meter to the resistance material and the one or more green billets to be sintered in the furnace body from top to bottom.

11. The system as claimed in claim 10, characterized in that, It also includes a heat-insulating material layer, located above the furnace body, or simultaneously above and below the furnace body, or simultaneously above, below and around the furnace body, wherein the heat-insulating material layer includes second type coke particles with a particle size of 0-2mm, and the second type of coke particles includes calcined petroleum coke particles and / or graphitized coke particles.

12. The system as claimed in claim 11, characterized in that, The content of particles smaller than 0.5 mm in the second type of coke particles is no more than 40%.

13. The system as described in claim 11, characterized in that, The furnace body generates flue gas during operation, and the furnace cover also includes an exhaust channel suitable for the flow of the flue gas. The insulation layer also includes a first type of coke particles with a particle size of 5mm to 8mm, which includes calcined petroleum coke particles and / or graphitized coke particles. The first type of coke particles form a coarse coke particle region with a diameter of 250mm to 500mm in the insulation layer. The coarse coke particle region corresponds to the exhaust channel in the furnace cover in the direction of flue gas flow.

14. The system as described in claim 13, characterized in that, The system also includes a green body production device, and the system is further configured to transport the flue gas discharged through the exhaust channel to the green body production device as a heat source for heating the heat transfer oil during the production of the green body.

15. The system according to any one of claims 1 to 14, characterized in that, The power control device is configured to control the power supply to adjust the electrical output parameters according to the temperature signal. The resistive material contains multiple thermocouples, including a temperature-controlling thermocouple located at the center of the furnace body and one or more temperature-measuring thermocouples distributed in other areas of the furnace body. The power control device is further configured to: receive a first temperature signal containing the temperature control temperature fed back by the temperature-controlling thermocouple, and a second temperature signal containing the temperature measurement temperature fed back by the multiple temperature-measuring thermocouples; calculate the temperature difference between the temperature control temperature and each of the temperature measurement temperatures; and control the power supply to adjust the electrical output parameters according to the comparison relationship between the temperature difference and a threshold.

16. The system as described in claim 15, characterized in that, The power control device is further configured to: when the temperature difference is higher than the threshold, control the power supply to maintain the current electrical output parameters unchanged until the temperature difference is lower than or equal to the threshold; when the temperature difference is lower than or equal to the threshold, control the power supply to adjust the electrical output parameters so that the furnace body of the carbon product sintering furnace continues to heat up.

17. The system as claimed in claim 16, characterized in that, The power supply is configured as an on-load adjustable voltage switch with more than 200 levels, and the power supply is adapted to adjust the electrical output parameters by means of the on-load adjustable voltage switch.

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