Carbon product sintering system and method, carbon product and carbon graphite product

Abstract

The invention provides a carbon product sintering system and method, a carbon product and a carbon graphite product, and the carbon product sintering system comprises a carbon product sintering furnace which comprises a furnace body and is 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 and controlling a power supply to adjust electrical output parameters according to the temperature signal. According to the carbon product sintering system and method, the yield of the carbon products can be greatly increased on the basis of reducing the cost.

Description

Technical Field

[0001] This application mainly relates to the field of graphitization, and particularly to a carbon product sintering system and method, carbon products, and carbon graphite products. Background Art

[0002] In the field of graphitization, in order to improve the quality and reduce the production cost of special carbon products and large-sized carbon graphite products (electrodes, anodes, cathodes, crucibles), in addition to improving the performance of raw materials, improving the performance matching between raw materials, and improving the kneading quality, the quality of sintering is a very important link. For example, in the classification of special carbon products, isostatic graphite, as a high-quality product in graphite materials, has a series of excellent properties and is widely used in industries such as photovoltaic, semiconductor, nuclear reactor, and medical. Currently, most of the isostatic graphite products produced by isostatic graphite production enterprises in the market have low performance, single variety, and large-sized high-performance isostatic graphite cannot be produced, or the quality level of the produced large-sized products is low. Especially for large-sized isostatic graphite, the output is very small. The main reason is that the roasting of large-sized isostatic graphite products is difficult, the yield is low, and the manufacturing cost is high. Due to uneven roasting quality, it is easy to cause secondary cracking during graphitization, and the final overall yield after graphitization is less than 40%.

[0003] In addition, for other carbon products, such as large-sized steelmaking electrodes and large-sized aluminum cathodes, the existing sintering methods still cannot achieve good effects of improving product quality and reducing 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 greatly improve the yield of carbon products on the basis of reducing costs.

[0005] To solve the above technical problem, this application provides a carbon product sintering system, including: a carbon product sintering furnace, including a furnace body for accommodating one or more green blanks to be sintered, wherein resistance material is filled around the green blanks; one or more thermocouples adapted to feedback temperature signals from the furnace body; a power supply adapted to supply power to the carbon product sintering furnace according to electrical output parameters, so that the resistance material generates heat to sinter the green blanks; and a power supply control device adapted to receive the temperature signals when the carbon product sintering furnace is working and control the power supply to adjust the electrical output parameters according to the temperature signals.

[0006] Optionally, in the carbon product sintering furnace, conductive electrodes are further 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, both sides of the furnace body further have conductive walls, and the resistance material is adapted to be electrically connected between the conductive walls and the conductive electrodes.

[0008] Optionally, the carbon product sintering furnace further includes copper bars or aluminum bars, and the copper bars or the aluminum bars are adapted to be connected between the conductive electrodes and the power supply.

[0009] Optionally, 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.

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

[0011] Optionally, the carbon product sintering furnace further includes a support frame 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 resistance material includes first-class coke particles with a particle size of 5 mm to 8 mm, and the first-class coke particles include calcined petroleum coke particles and / or graphitized coke particles.

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

[0015] Optionally, it further includes a heat insulation 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 insulation material layer includes second-class coke particles with a particle size of 0 to 2 mm, and the second-class coke particles include calcined petroleum coke particles and / or graphitized coke particles.

[0016] Optionally, the content of the second-class coke particles with a particle size of less than 0.5 mm is not more than 40%.

[0017] Optionally, the furnace body generates flue gas during operation, and the furnace cover further includes an exhaust channel adapted for the flow of the flue gas, wherein the heat insulation material layer further includes first-class coke particles with a particle size of 5 mm to 8 mm, and the first-class coke particles include calcined petroleum coke particles and / or graphitized coke particles; the first-class coke particles form a coarse coke particle zone with a diameter of 250 mm to 500 mm in the heat insulation material layer; and the coarse coke particle zone corresponds to the exhaust channel in the furnace cover in the flow direction of the flue gas.

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

[0019] Optionally, the resistance material has a plurality of thermocouples. The plurality of thermocouples include a temperature control thermocouple located at the central position of the furnace body and one or more temperature measurement thermocouples distributed in other areas of the furnace body. The power control device is configured to: receive a first temperature signal including a temperature control temperature fed back by the temperature control thermocouple and a second temperature signal including a temperature measurement temperature fed back by the plurality of temperature measurement 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 value.

[0020] Optionally, the power control device is further configured to: when the temperature difference is higher than the threshold value, control the power supply to maintain the current electrical output parameters unchanged until the temperature difference is lower than or equal to the threshold value; when the temperature difference is lower than or equal to the threshold value, 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 to have a loaded tap-changer with more than 200 levels, and the power supply is adapted to adjust the electrical output parameters through the loaded tap-changer.

[0022] On the other hand, the present application also proposes a method for sintering carbon products. The carbon product sintering system has a carbon product sintering furnace, a power supply, and a power control device. The method includes the following steps: loading one or more green bodies to be sintered into the furnace body of the carbon product sintering furnace, and at the same time filling resistance material around the green bodies; placing one or more thermocouples in the resistance material, and the thermocouples are adapted to feed back temperature signals from the furnace body; starting the power control device and the power supply so that the carbon product sintering system starts to work; receiving the temperature signals through the power control device and controlling the power supply to adjust the electrical output parameters according to the temperature signals; supplying power to the carbon product sintering furnace by the power supply according to the electrical output parameters, so that the resistance material generates heat to sinter the green bodies.

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

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

[0025] Optionally, the step of placing one or more thermocouples in the resistance material further includes: placing the thermocouple while filling the resistance material; or placing a protective tube while filling the resistance 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 control thermocouple located at the central position 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 control 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 the threshold value.

[0027] Optionally, the method further includes: when the temperature difference is higher than the threshold value, controlling the power supply to maintain the current electrical output parameters unchanged until the temperature difference is lower than or equal to the threshold value; when the temperature difference is lower than or equal to the threshold value, 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 the temperature deviation situation where the temperature difference between the temperature measurement temperature and the temperature control temperature fed back by each of the temperature measuring thermocouples is higher than the threshold value during the sintering process of the current green compact, and adjusting the position of the temperature measuring thermocouple in the furnace body according to the temperature deviation situation during the sintering process of the next green compact.

[0029] Another aspect of the present application also proposes a carbon product sintered by using the carbon product sintering method of any embodiment of the present application.

[0030] Another aspect of the present application also proposes a carbon graphite product obtained by performing an impregnation process and a graphitization process on the carbon product in the above embodiment of the present application.

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

[0032] Optionally, the carbon graphite product includes special carbon products.

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

[0034] Optionally, the size parameter of the special carbon graphite product is greater than 500 mm. Exemplarily, the size parameter is determined by characteristics such as the shape of the carbon graphite product. For example, for a circular carbon graphite product, its size parameter is the diameter, while for a square carbon graphite product, its size parameter is the value of the side length. For products of other shapes or irregular shapes, the size parameter can be understood as the minimum value among the measurable size parameters of the outer edge boundary. This application does not limit this.

[0035] Compared with the prior art, the present application has the following advantages: By setting the linkage between the thermocouple and the power control device, the electrical output parameters of the power supply (such as a transformer, preferably a rectifier transformer) are adjusted in real time, so that the carbon product sintering furnace can be heated and sintered according to the set roasting curve, improving the yield and reducing the cost. In some preferred embodiments, a multi-stage voltage regulating rectifier power supply can accurately adjust the electrical output parameters of the power supply to finely control the temperature change. In addition, there is an improved carbon product sintering furnace in the system. Through methods such as pressure sintering and in cooperation with the thermocouple temperature signal feedback adjustment mechanism, while reducing the production cost as a whole, the quality of the product is greatly improved, making the product reach excellent material properties. Generally speaking, the carbon product sintering-related equipment and process solutions of the present application use the set roasting curve for heating and sintering all carbon products, and all have the advantages of uniform roasting quality and can significantly improve the yield. In particular, for large-sized carbon products or carbon graphite products, the improvement effect is more obvious. Among them, for special carbon products with large size specifications (such as more than 500 mm), there are more prominent quality improvement effects and economic benefits of cost reduction. BRIEF DESCRIPTION OF THE DRAWINGS

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

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

[0038] Figure 2 、 Figure 3 and Figure 4 is a schematic diagram of the structure of a carbon product sintering furnace in a carbon product sintering system according to a preferred embodiment of the present application;

[0039] Figure 5 is a comparison schematic diagram between the roasting curve of a carbon product sintering system according to an embodiment of the present application and the prior art solution;

[0040] Figure 6 and Figure 7 is a schematic flow chart of a method for sintering carbon products according to an embodiment of the present application; and

[0041] Figure 8 and Figure 9 is a schematic structural diagram of a roasting furnace in the prior art. Detailed implementation manners

[0042] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the accompanying drawings required for the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings in the following description are only some examples or embodiments of the present application. For those of ordinary skill in the art, without creative efforts, the present application can also be applied to other similar scenarios based on these drawings. Unless obvious from the language context or otherwise stated, the same reference numerals in the drawings represent the same structure or operation.

[0043] As shown in the present application and the claims, unless the context clearly indicates an exceptional situation, words such as "a", "an", "one" and / or "the" are not specifically singular and may also include plural. Generally speaking, the terms "comprising" and "including" only indicate the inclusion of the clearly identified steps and elements, and these steps and elements do not constitute an exclusive list. The method or device may also include other steps or elements.

[0044] Unless otherwise specifically stated, the relative arrangements, numerical expressions and values of the components and steps described in these embodiments do not limit the scope of the present application. At the same time, it should be understood that for the convenience of description, the dimensions of the various parts shown in the drawings are not drawn according to the actual proportional relationship. Technologies, methods and devices known to those of ordinary skill in the relevant field may not be discussed in detail, but in appropriate cases, the said technologies, methods and devices should be regarded as part of the authorization specification. In all the examples shown and discussed here, any specific value should be interpreted as merely exemplary and not as a limitation. Therefore, other examples of the exemplary embodiments may have different values. It should be noted that similar reference numerals and letters represent similar items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further discussed in the subsequent drawings.

[0045] In the description of the present application, it should be understood that the orientation or positional relationship indicated by orientation terms such as "front, rear, upper, lower, left, right", "lateral, vertical, perpendicular, horizontal" and "top, bottom", etc. is usually based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present application and simplifying the description. Without contrary explanation, these orientation 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. Therefore, it should not be construed as a limitation on the protection scope of the present application; the orientation terms "inside, outside" refer to the inside and outside relative to the contour of each component itself.

[0046] For the convenience of description, spatial relative terms such as "above...", "over...", "on the upper surface of...", "upper...", etc. can be used here to describe the spatial positional relationship between a device or feature shown in the drawings and other devices or features. It should be understood that the spatial relative terms are intended to include different orientations in use or operation other than the orientation described in the drawings for the device. For example, if the device in the drawings is inverted, the device described as "above other devices or structures" or "over other devices or structures" will then be positioned as "below other devices or structures" or "under other devices or structures". Thus, the exemplary term "above..." can include both the orientations of "above..." and "below...". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and corresponding interpretations should be made for the spatial relative descriptions used here.

[0047] In addition, it should be noted that the use of terms such as "first", "second", etc. to limit components is only for the convenience of differentiating the corresponding components. Without separate statement, the above terms have no special meaning. Therefore, it should not be construed as a limitation on the protection scope of the present application. In addition, although the terms used in the present application are selected from well-known and commonly used terms, some of the terms mentioned in the specification of the present application may be selected by the applicant according to his or her judgment, and their detailed meanings are described in the relevant parts of the description herein. In addition, it is required to understand the present application 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, or coupled to, or in contact with the other component, or there can be intervening components. 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 are no intervening components. Similarly, when a first component is referred to as "electrically in contact with" or "electrically coupled to" a second component, there is an electrical path for current flow between the first component and the second component. The electrical path can include capacitors, coupled inductors, and / or other components that allow current flow, even without direct contact between the conductive components.

[0049] One embodiment of the present application is described with reference to Figure 1 A carbon product sintering system 10 is provided, including: a carbon product sintering furnace 11, a power supply 12, and a power supply control device 13. Among them, the carbon product sintering furnace 11 includes a furnace body 110, in which there is one or more green compacts 1101 to be sintered. Resistance material 1102 is filled around the green compacts 1101, and one or more thermocouples 1103 are provided in the resistance material 1102. The thermocouples 1103 are adapted to feedback the temperature signal from the furnace body 110 and send the temperature signal 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, based on this preferred implementation, the power supply 12 is written as the transformer 12, and the power supply control device 13 is written as the transformer control device 13 in the following description. However, this does not limit the selection of the types of the power supply and the power supply control device in different embodiments of the present application. Specifically, the transformer 12 is adapted to supply power to the carbon product sintering furnace 11 according to electrical output parameters, so that the resistance material 1102 generates heat to sinter the green compacts 1101 and form 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, the transformer control device 13 is adapted to receive the temperature signal when the carbon product sintering furnace 11 is operating, and control the transformer 12 to adjust the electrical output parameters according to the temperature signal, so that the furnace body 110 is heated and sintered according to the firing curve corresponding to the green compacts 1101. The content of the firing curve will be further described later with reference to Figure 5 be further described.

[0050] In the carbon product sintering system 10, the high-temperature electric sintering method that generates heat through resistance materials can improve the sintering quality and stability of carbon products. Moreover, by adjusting the electrical output parameters of the transformer 12 in real time according to the temperature signal provided by the thermocouple 1103, the different parts of a green compact 1101 in the furnace body 110, or multiple green compacts 1101 among each other, can be heated and sintered in a relatively uniform and consistent manner. Taking multiple green compacts 1101 as an example, by using the carbon product sintering system 10, the problem that the quality and yield of products are low due to the large temperature difference among the green compacts 1101 at various parts in the furnace body 110 can be effectively avoided. In addition, since the heating method is relatively uniform and consistent, the sintering effect can generally be achieved within a shorter roasting time, so the production time and cost can also be reduced. The carbon product sintering system 10 can achieve a good sintering effect on any type of carbon product, even for special carbon products in the high-precision field, or even large-size special carbon products (such as isostatic graphite with size parameters greater than 500 mm), etc., and can greatly improve the yield of carbon products on the basis of reducing production costs. For example, for existing large-size carbon products or carbon-graphite products, especially for dimensions of about 2 meters in length, about 0.7 meters in width, and about 0.5 meters in thickness, adopting the solution of this application has an obvious improvement effect on improving the sintering quality. For such large-size specifications, for example, in the case of the longer dimension in the length direction mentioned above, adopting the solution of this application can enable each position of a single green compact to achieve uniform sintering, and can also enable multiple green compacts in the furnace body to achieve uniform sintering.

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

[0052] Specifically, according to Figure 2 , there is a furnace head area 21 and a furnace tail area 22 on each of the left and right sides of the furnace body 23, and there are also conductive electrodes in the furnace head area 21 and the furnace tail area 22 on the left and right sides of the furnace body 23 respectively. Among them, 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 bar or an aluminum bar, and the conductor 252 is adapted to be connected between the head conductive electrode 210 and the transformer 251, and between the tail conductive electrode 220 and the transformer 251. Further, in the working state, a plurality of green blanks 230 are placed in the furnace body 23, and the furnace body 23 is filled with a resistance material 231 in the area outside the green blanks 230. Referring to Figure 4 , there are also a plurality of thermocouples 29 in the resistance material 231, and the thermocouples 29 are adapted to feedback the temperature signal from the furnace body 23.

[0053] Preferably in this embodiment, referring to Figure 2 and Figure 3 , on both sides of the furnace body 23, the furnace head area 21 and the furnace tail area 22 also include a conductive wall 253, and the resistance material 231 is adapted to be electrically connected between the head conductive electrode 210 and the tail conductive electrode 220 through the conductive wall 253. Since the sizes of the head conductive electrode 210 and the tail conductive electrode 220 themselves are relatively small compared to the furnace body 23, after configuring the conductive wall 253, the contact area between the resistance material 231 and the conductive components can be increased, thereby improving the problem of uneven current. In this embodiment, since the carbon product sintering furnace 20 needs to operate in an environment with a high temperature (for example, greater than 1200 degrees Celsius), the head conductive electrode 210, the tail conductive electrode 220, and the conductive wall 253 are preferably all composed of a graphite material that can withstand high temperatures, and this application does not limit such a graphite material.

[0054] In this embodiment, according to Figures 2 to 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, and the refractory furnace wall 26 is used to protect the working area therein. In other embodiments of this application, depending on different process implementation scenarios, the refractory furnace wall can also only partially surround the furnace body, and other materials or structures are used for protection in other areas without a furnace wall, and this application does not limit this. Preferably, the material of the refractory furnace wall 26 in this embodiment is clay mainly composed of aluminum oxide. Further preferably, in this embodiment, referring toFigure 3 and Figure 4 The carbon product sintering furnace 20 further has a base 27, preferably made of concrete, located below the furnace body 23. By providing the base 27, the load-bearing capacity can be increased to ensure that the overall furnace body structure of the carbon product sintering furnace 20 does not deform. In this embodiment, preferably, the carbon product sintering furnace 20 may further include a support frame. Exemplarily, a support frame made of steel (not shown in the figure) can be fixedly connected to the furnace wall 26 to improve the overall stability of the carbon product sintering furnace 20.

[0055] Further referring to Figure 4 the top area 24 of the furnace includes a furnace cover 241, and the furnace cover 241 has a through exhaust passage 240. In this embodiment, preferably, the furnace cover 241 is mainly made of high-aluminum (Al2O3) refractory castable, and the weight is such that it forms a pressure of 2 to 6 tons per square meter on the charged furnace materials (i.e., the resistance material 231 and the green body 230 to be sintered in the furnace body 23). By such a setting, the furnace cover 241 can apply sufficient pressure to the furnace body 23, so that the green body 230 is not easily cracked during the sintering process, improving the yield. According to Figures 2 to 4 in this embodiment, the number of green bodies 230 is multiple. Preferably, the multiple green bodies 230 are arranged at uniform intervals in the furnace body 23. And, in order to obtain better preparation effects, in a preferred embodiment, the distance between every two adjacent green bodies 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 body 230 to be sintered (for example, a special carbon compacted body) is evenly loaded into the furnace body 23, and a certain particle size of resistance material 231 is evenly filled around the green body 230. The transformer 251 is started to supply power to the furnace body 23, and the resistance material 231 generates heat under the action of current, and the heat is directly used to heat the green body 230 to achieve the sintering purpose. In this embodiment, preferably, the electrical properties of the resistance material 231 can be controlled to be uniform, for example, the electrical property values of the resistance material 231 at different positions in the furnace body 23 are the same or within the same value range, and the filling around the green body 230 is uniform, so as to achieve uniform heat generation to achieve uniform heating of the green body.

[0057] Further, in this embodiment, more preferably, the carbon product sintering furnace 20 further includes a heat-insulating material layer 28. Referring to Figure 3 and Figure 4 the heat-insulating material layer 28 is preferably located above and below the furnace body 23. However, the present application is not limited thereto. In different embodiments of the present application, the heat-insulating material layer may be only located above the furnace body to isolate air and apply pressure to the furnace body; and in some cases, the heat-insulating material layer may further be located above and below the furnace body at the same time, or above, below and around the furnace body at the same time, so as to better insulate the furnace body from the outside.

[0058] In this embodiment, in order to achieve a better roasting effect, it is preferably set that the pressure provided by the furnace cover 241 to the green compact 230 and the resistance material 231 around it from top to bottom through the heat-insulating material layer 28 is 2 to 6 tons per square meter. As described above, by selecting a high-aluminum refractory material for the furnace cover 241, the pressure of the furnace cover 241 can be increased, so as to perform better pressure roasting on the green compact 230 to be sintered.

[0059] In this embodiment, the resistance material 231 includes a first type of coke particles with a particle size of 5 mm to 8 mm, and the first type of coke particles includes calcined petroleum coke particles and / or graphitized coke particles. At the same time, the heat-insulating material layer 28 includes a second type of coke particles with a particle size of 0 to 2 mm, and the second type of coke particles also includes calcined petroleum coke particles and / or graphitized coke particles. Specifically, the raw material of the calcined petroleum coke particles is coke, and it is coke particles treated at 1300 degrees; on the other hand, the raw material of the graphitized coke particles is also coke, and it is coke particles treated at 2500 degrees. The first type of coke particles and the second type of coke particles in this application can be freely selected between these two materials.

[0060] In this embodiment, preferably, in the second type of coke particles in the heat-insulating material layer 28, the content of particles with a particle size of less than 0.5 mm is not more than 40%. Such a setting can avoid the risk of increased dust explosion due to smaller particle size and improve safety. Further preferably, as Figure 4 shown, the heat-insulating material layer 28 further includes a first type of coke particles with a particle size of 5 mm to 8 mm. The first type of coke particles forms a coarse coke particle area 281 with a diameter of 250 mm to 500 mm in the heat-insulating material layer 28. When the furnace body 23 is working, flue gas is generated, and the coarse coke particle area 281 corresponds to the exhaust passage 240 in the furnace cover 241 in the flowing direction of the flue gas. For the fine coke particle area 282 outside the coarse coke particle area 281 of the heat-insulating material layer 28, the above-mentioned second type of coke particles with a particle size of 0 to 2 mm are used, so as to achieve the effect of isolating external air and heat insulation for the furnace body 23, and cooperate with the weight of the furnace cover 241 to pressurize the furnace body 23 to achieve pressure electric roasting. In this way, during the pressure roasting process, the flue gas generated during the roasting process can be directly transported through the passage in the heat-insulating material layer, without adding an additional tail gas collection device, which can save production costs.

[0061] In this embodiment, the furnace lid 241 is made into a heavy block (i.e., a gravity furnace lid). While collecting flue gas through the exhaust passage 240, the weight of the furnace lid 241 applies a continuous pressure to the green compact 230 during sintering through the heat-insulating material layer 28 and the resistance material 231 filled around the green compact 230, offsetting the expansion force generated from the inside to the outside of the green compact 230 when discharging the asphalt flue gas, as well as the thermal expansion force generated during its heating, promoting the rearrangement of particles in the green compact 230, reducing the possibility of cracking, and increasing the final sintering density of the product, thereby improving the sintering quality.

[0062] Further referring to Figure 4 , in this embodiment, more preferably, it further includes a plurality of thermocouples 29, and the plurality of thermocouples 29 are distributed in the resistance material 231 inside the furnace body 23. Exemplarily, a temperature signal can be fed back to a 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 each green compact 230 to be baked inside the furnace body 23, or different parts of the same green compact 230 to be baked, can be heated evenly. In this embodiment, preferably, referring to Figure 4 , the plurality of thermocouples 29 include a temperature-control thermocouple 291 located at the central position of the furnace body 23 and temperature-measuring thermocouples 292 distributed in other areas of the furnace body 23. In such an embodiment, the transformer control device 250 as shown in Figure 2 is configured to receive a first temperature signal containing the temperature-control temperature fed back by the temperature-control thermocouple 291 and a second temperature signal containing the temperature-measuring temperature fed back by the plurality of temperature-measuring thermocouples 292, calculate the temperature difference between the temperature-control temperature and each temperature-measuring temperature, and control the transformer 251 to adjust the electrical output parameters according to the comparison relationship between the temperature difference and the threshold value. Specifically, the temperature-control temperature can be understood as representing the working temperature of the furnace body 23 or the set temperature at any moment in the baking curve corresponding to the carbon product. Exemplarily, the temperature corresponding to the threshold value can be in the range of 4% to 10% of the temperature-control temperature, preferably 5%. For example, if the temperature-control temperature at a certain moment is 1000 degrees, then the threshold value can be selected between 40 degrees and 100 degrees at this time.

[0063] Specifically, as shown in Figure 2The transformer control device 250 shown can be further configured such that when the temperature difference between the temperature control temperature and the temperature measurement temperature is higher than a threshold value, 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 value; on the other hand, when the temperature difference is lower than or equal to the threshold value, 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 having a level greater than 200, and the transformer 251 is suitable for adjusting the electrical output parameters through the on-load adjustable voltage switch. As mentioned above, 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 a load-adjustable voltage switch with more than 200 levels is used, the output voltage of the transformer 251 can be fine-tuned in more than 300 levels within the voltage range of 15 volts to 120 volts, so that the change of the output current can be more accurately close to the temperature increase requirement of the green body 230, and the roasting temperature of the local position can be quickly and accurately increased when the local temperature increase does not meet the process requirements.

[0064] In order to better understand the above feedback regulation mechanism of the thermocouple 29, refer to Figure 4 Give an example. Figure 4 , taking the green body 2301 located in the center area of the furnace body 23 and the green body 2302 located in the bottom area of the furnace body 23 as examples. During the heating and temperature raising process of the furnace body 23, at a certain time t, the transformer control device 250 receives a first temperature signal including the temperature control temperature T1 transmitted from the temperature control thermocouple 291, and a second temperature signal including the temperature measurement temperature T2 transmitted from the temperature measurement thermocouple 292 near the green body 2302. Among them, the temperature control temperature T1 at time t is 800 degrees Celsius, which represents the overall temperature of the furnace body 23. Specifically, according to the roasting curve of the carbon product, the set temperature corresponding to time t is 800 degrees Celsius, then the output current / output voltage of the transformer 251 is first controlled so that the temperature in the furnace body 23 reaches 800 degrees Celsius; if the output parameter of the transformer 251 remains unchanged at this time, the temperature control temperature T1 remains unchanged in the period near time t. That is, in this period, the heating temperature in the furnace body 23 is maintained at about 800 degrees. In addition, it is assumed that the threshold value for temperature difference comparison is 5% of the temperature control temperature T1, which is 40 degrees Celsius.

[0065] Further, at time t, when the temperature measuring thermocouple 292 monitors that the measured temperature T2 is 750 degrees Celsius and the temperature difference of 50 degrees Celsius between the measured temperature T2 and the controlled temperature T1 has exceeded the threshold of 40 degrees Celsius, at this time, the transformer control device 250 controls the transformer 251 to maintain the heating temperature at the controlled temperature T1 of 800 degrees Celsius unchanged until the temperature difference between the measured temperature T2 near the green compact 2302 and the controlled temperature T1 monitored by the temperature measuring thermocouple 292 is less than or equal to 40 degrees Celsius. At this time, the electrical output parameters of the transformer 251 are further adjusted so that the furnace body 23 continues to heat up according to the baking curve of the carbon product until the internal green compact 230 reaches the final high-temperature sintering requirement.

[0066] Through the above control method, before a large temperature difference is about to occur in different regions of the furnace body 23, the electrical output parameters of the transformer 251 are timely controlled so that the furnace body 23 waits at the current temperature level until the temperatures of all regions inside the furnace body 23 tend to be consistent and then continues to heat up. In this way, the green compacts 230 in the carbon product sintering furnace 20 can heat up according to an improved baking curve. Specifically, the baking curve includes the functional relationship between the baking time and the baking temperature. Exemplarily, Figure 5 Fig. shows a comparison schematic diagram of the set baking curve A of the carbon product sintering system 20 for heating and sintering multiple green compacts 230 and the set baking curve B of the products in the existing carbon product sintering process. When the sintering process is carried out in the existing way, the ideal baking curve B of the internal products is shown. Among them, in actual multiple different sintering processes, a temperature deviation of + / -5% is allowed. Therefore, the overall sintering effect can vary within the interval formed by the B1 and B2 curves. In this application, by using the carbon product sintering system 20, the green compact 230 can be heated up according to the improved ideal baking curve A. Similarly, in actual multiple different sintering processes, a temperature deviation of + / -5% is also allowed. Therefore, the overall sintering effect of using the carbon product sintering system 20 can vary within the interval formed by the A1 and A2 curves. Through comparison, it can be seen that compared with the baking curve B, in order to reach the same final sintering temperature, the baking curve A has a shorter baking time. This is because after the feedback adjustment of the thermocouple 29, the multiple green compacts 230 at various positions in the furnace body 23 can all be heated and sintered in a relatively consistent and uniform heating manner, and the temperature deviation near each green compact 230 is small, thus avoiding a large amount of heating waiting time caused by a large temperature difference; further, it can also improve the situation such as cracking of the product during firing, thereby optimizing the original baking curve B, reducing the production cost while improving the quality of the product.

[0067] This application Figure 4In [the above], the temperature-measuring thermocouples 292 are respectively arranged at the upper and lower parts of the furnace body 23, so that the temperature distribution of the furnace body 23 can be comprehensively obtained, which is convenient for controlling the roasting temperature. Of course, the number of thermocouples and their arrangement positions in the furnace body are not limited in this application. In other embodiments, there may be more or fewer temperature-measuring thermocouples. Preferably, after the current electric sintering process is completed, experience can be summarized to know which part of the furnace body 23 is likely to have a large difference in temperature from other areas of the furnace body 23. During the next roasting process, temperature-measuring thermocouples can be focused on arranging in the areas where temperature differences are likely to occur to further optimize the roasting curve.

[0068] In this embodiment, by inserting the thermocouple 29 into the resistance material 231 and connecting it to the transformer control device 250, the temperature signal is transmitted into the transformer control device 250. The transformer control device 250 makes a refined comparison between the collected temperature signal and the set roasting curve (such as roasting curve A shown as Figure 5 ), and then issues a signal instruction to the transformer 251 according to the judgment strategy described above to keep its existing electrical output parameters unchanged, or change the electrical output parameters to continue heating according to the roasting curve. Preferably, the transformer 251 can adopt an adjustable-voltage rectifier special transformer and be configured with an on-load voltage-regulating switch with more than 300 levels to achieve fine voltage adjustment, ensuring that the heat generated by the resistance material 231 in each period can meet the heating requirements. In this embodiment, it is preferably to set a control thermocouple 291 for control at the central position of the furnace body 23. The temperature control signal monitored by the control 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, and the monitored temperature-measuring signals are also connected to the transformer control device 250. When the difference between the measured temperature and the set heating curve exceeds the allowable range, the transformer control device 250 automatically adjusts the power transmission amount and power transmission time to compensate for the deficiency caused by the temperature difference.

[0069] Through the linkage of the thermocouple 29 installed in the resistance material 231 around the green body 230 and the transformer 251, and through the feedback adjustment of the transformer control device 250, the transformer 251 can be automatically controlled to supply power to the carbon product sintering furnace 20 in real time according to the adjusted electrical output parameters, and it can easily achieve heating according to the improved product roasting curve. During the heating process of sintering, the temperatures near the green bodies 230 at different positions basically rise uniformly, so there is no need to extend the sintering curve due to uneven temperature or the temperature not meeting the requirements of the roasting curve. In this way, on the basis of reducing costs, the sintering quality of the product can be improved.

[0070] In this field, the purpose of carbon product sintering is to sinter the pitch in the product into coke during the heating process and combine it with the coke in the product itself. Taking the special carbon products in graphitized products as an example, the principle for formulating the roasting curve in the production of existing special carbon products is to complete the pitch coking with the aim of preventing the products from cracking during roasting. When using the carbon product sintering system of the present application to produce special carbon products of the same model, not only can the roasting heating rate be greatly increased, but the temperature difference within the entire furnace and the temperature difference of a single product can be strictly controlled, greatly improving the quality and yield of the products. At the same time, it is also possible to improve the roasting curve according to the sintering performance of the pitch in the carbon product, so that the coke performance generated by coking of the pitch is consistent with the performance of the raw coke under a reasonable sintering curve, further improving the product performance. The main raw material source of special carbon products is the residual oil (similar to the commonly said pitch) from coal coking and petroleum refining. Coke is obtained by coking at high temperature. The residual oil is heated to a high temperature (above 1000 °C) in a short time and then coked under pressure to obtain good-quality coke. In the prior art, the roasting curve in the production of special carbon products is easily prone to product cracking due to uneven heating temperature of the products. For example, the temperature in some positions of the furnace body is higher while the temperature in some positions is lower, and it is impossible to ensure that all products are strictly heated according to the set roasting curve or its allowable error range (such as the curves B1, B, and B2 shown in Figure 5 ). The heating rate is slow, and the conversion rate of the pitch into coke, that is, the quantity of the pitch converted into coke, is low and cannot be converted into flue gas and discharged. In the preferred embodiment of the present application, after feedback adjustment by real-time monitoring of the furnace body temperature, a load-tap-changing switch with 200 levels or more is used to adjust the output voltage of the transformer. Since the number of voltage adjustment levels is high, the sintering temperature can be controlled more precisely. By comparing the curves A and B shown in Figure 5 , the present application can use the improved roasting curve A for product sintering. Compared with the curve B using the existing method, the roasting curve can be shortened (i.e., the sintering time is shortened) to increase the coking rate of the pitch and improve the product quality. It has been proven by practice that when using the carbon product sintering system of the present application to sinter carbon products, the curve can be shortened by 30% when sintering the same products, and the coking rate of the pitch can be increased by 2%.

[0071] Generally speaking, the carbon product sintering system proposed in the above embodiments of the present application can greatly improve the product quality and reduce the production cost. The improved electric sintering method of the present application has the following multiple advantages: 1) When sintering the product, the temperature can be raised strictly according to the set roasting curve, and at the same time, multiple products are heated synchronously during the sintering process, shortening the overall heating time of the roasting curve; 2) On the premise that the quality of the green body is stable, that is, the structural performance is guaranteed, the sintering yield can basically reach 100%; 3) During the sintering process, by designing the quality of the furnace cover, the products being sintered are sintered under the set pressure, and at the same time, the volatilized asphalt gas generated can be discharged smoothly through the exhaust channel without causing safety hazards; 4) The asphalt flue gas discharged from the furnace body is collected and processed by a special collection device, and can be used as the heating heat source of the heat transfer oil during the production of the green body, improving the energy utilization efficiency and further reducing the cost.

[0072] Another aspect of the present application refers to Figure 6 A carbon product sintering method 30 is proposed, which is applicable to a carbon product sintering system. The carbon product sintering system has a carbon product sintering furnace, a power supply, and a power supply control device. Exemplarily, the carbon product sintering system can be the carbon product sintering system proposed in any embodiment of the present application, and of course, it can also be appropriately modified based on the carbon product sintering system proposed in the present application. In the present application Figure 6 Flowcharts are used to illustrate the operations performed by the systems according to the embodiments of the present application. It should be understood that the operations in the front or below do not necessarily need to be executed precisely in sequence. On the contrary, various steps can be processed in reverse order or simultaneously. At the same time, one or more other operations can be added to these processes, or one or several steps can 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 bodies to be sintered into the furnace body of the carbon product sintering furnace, and at the same time fill resistance materials around the green bodies; Step S2 is to place one or more thermocouples in the resistance materials, and the thermocouples are suitable for feedbacking temperature signals from the furnace body; Step S3 is to start the transformer control device and the transformer to make the carbon product sintering system start to work; Step S4 is to receive the temperature signal through the transformer control device 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 by the transformer according to the electrical output parameters, so that the resistance materials generate heat to sinter the green bodies.

[0074] Preferably, in the present application, the carbon product sintering method 30 further includes loading a plurality of green blanks to be sintered into the furnace body at a consistent spacing. Further preferably, in order to obtain a resistance material with uniform performance, it further includes screening and mixing the raw materials of the resistance material before filling the resistance material. Specifically, preferably in the present application, the resistance material includes calcined petroleum coke particles and / or graphitized coke particles. Since the calcined petroleum coke particles and / or graphitized coke particles from different sources and batches have differences in characteristics, the screening and mixing operations can make the electrical properties of each position of the resistance material loaded into the same furnace body consistent, so that the furnace body is heated uniformly at each position, ensuring the sintering quality.

[0075] Preferably, in the present application, the step of placing one or more thermocouples in the resistance material further includes: placing the thermocouple while filling the resistance material; or placing the protective tube while filling the resistance material, and placing one or more thermocouples in the corresponding protective tube before starting the transformer control device and the transformer. The present application does not limit the way of placing the thermocouple.

[0076] Further preferably, the plurality of thermocouples in the furnace body in the present application include a temperature control 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 is to receive a first temperature signal containing the temperature control temperature feedback by the temperature control thermocouple and a second temperature signal containing the temperature measurement temperature feedback by the plurality of temperature measuring thermocouples. Step S42 is to calculate the temperature difference between the temperature control temperature and each temperature measurement temperature. Step S43 is to judge the magnitude relationship between the temperature difference and the threshold. When the temperature difference is higher than the threshold, step S44 is executed to control the transformer to maintain the current electrical output parameters unchanged and continue to return to step S41 to detect the temperature signal until the temperature difference is lower than or equal to the threshold. If the judgment result of step S43 is negative, step S45 is executed to control the transformer to adjust the electrical output parameters so that the furnace body of the carbon product sintering furnace continues to heat up.

[0078] Further preferably, the carbon product sintering method 30 may further include recording the temperature deviation situation where the temperature difference between the temperature measurement temperature and the temperature control temperature feedback by each temperature measuring thermocouple is higher than the threshold during the sintering process of the current green blank, and adjusting the position of the temperature measuring thermocouple in the furnace body according to the temperature deviation situation during the sintering process of the next green blank. In this way, the roasting curve can be further optimized after multiple sinterings, continuously improving the process effect.

[0079] Another aspect of the present application also provides a carbon product, which is sintered by using the carbon product sintering method of any embodiment of the present application (for example, the above carbon product sintering method 30). On this basis, the present application further proposes a carbon graphite product, which is obtained by subjecting the above carbon product to an impregnation baking process and a graphitization process. Such a carbon graphite product has excellent properties compared with some ordinary graphitized products in the market, and can be understood as a new product in the field of special carbon in the graphitization field.

[0080] Preferably, the impregnation baking process includes impregnation and secondary electro-baking; in addition, the graphitization process includes steps such as high-temperature graphitization treatment, where the temperature of the high-temperature graphitization treatment is above 2500 degrees Celsius. The specific graphitization process can refer to some conventional steps of the existing graphitization process, which will not be elaborated here as it is not the focus of the present application. Further preferably, the carbon graphite product obtained by the above method of the present application includes special carbon products. Among them, the special carbon graphite product includes isostatic graphite. Preferably, the size of such a special carbon graphite product is 500 mm or above. That is to say, the carbon graphite product prepared by using the process method proposed in the present application can achieve high-quality and high-yield production of large-size special carbon products. Exemplarily, such a carbon graphite product preferably has the following excellent product characteristics: the resistivity range is between 9 μΩ and 12 μΩ, and / or the density of the carbon graphite product is between 1.8 g / cc and 1.85 g / cc.

[0081] Due to the use of current existing technical means, it is difficult to prepare special carbon products with large-size parameters from a technological perspective, and there are often difficulties such as product cracking and very low yield; while the improved process equipment and method of the present application have greatly improved this situation. Therefore, for the carbon graphite product of the present application, its resistivity range can be between 9 μΩ and 12 μΩ, and / or the density of the carbon graphite product is between 1.8 g / cc and 1.85 g / cc. Additionally, optionally, the size of the carbon graphite product is 500 mm or above in large specifications. Of course, the present application is not limited to this either. Although the present application has significant advantages in improving the process yield for the above-mentioned large-size special carbon products, in some embodiments of the present application, the carbon product sintering furnace proposed in the present application can also be used to prepare carbon products that do not require high-temperature graphitization treatment, and good preparation effects can also be obtained. Such carbon products include graphite electrodes, graphite cathodes, pre-baked anode materials, regenerated crucibles, and so on.

[0082] To better understand the beneficial effects of the present application, examples of existing roasting furnaces in the prior art are provided below for illustration. As Figure 8 and Figure 9 show the attached drawing examples of the ring-type roasting furnace in the prior art, and the ring-type roasting furnace has many defects in actual production applications. Specifically refer toFigure 8 , in which the covered ring-type roasting furnace 40 has a refractory brick firewall 41, a filler 42 and carbon products 43 therein. The roasting principle of the roasting 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 of the previous furnace conducts heat energy to the filler around the carbon products 43 through the furnace wall, and then the filler 42 heats and roasts the products. The disadvantages of this roasting furnace are as follows: (1) The heat conduction efficiency is low. The heat of the flue gas passes through the furnace wall and then conducts to the filler, and then the filler heats and roasts the products. The heat conduction path is long and the thermal conductivity is poor; (2) Temperature control is difficult. The synchronism between the flue gas temperature and the product temperature is poor. It is very difficult to measure and control the flue gas temperature in production to meet the heating rate required by the products; (3) The flue gas flow rate and temperature determine the amount of roasting heat provided, and basically cannot be effectively controlled; (4) In actual production, for large-sized products, due to the large height from top to bottom, the temperature difference between the upper and lower parts of the products is large; (5) The above-mentioned various adverse factors result in the need to use an extremely long roasting curve to make up for the deficiencies of poor thermal conductivity and inaccurate temperature control. The products are prone to cracking, resulting in a low yield. The roasting temperature difference of each part of the large-sized products is large, and the quality difference of the roasted products is large. The parts of the products in the low-temperature area will be under-roasted and are prone to secondary cracking during graphitization.

[0083] On this basis, Figure 9 shows an improved ring-type roasting furnace 50 based on Figure 8 a heat-resistant metal crucible 51, a filler 52 and roasted products 53. It can be seen from the structure diagram that the ring-type roasting furnace 50 has greatly improved in terms of heat transfer performance, heat transfer efficiency and temperature control compared with the covered ring-type roasting furnace 40, and the quality and yield of the products have been greatly improved. However, there are still inherent deficiencies in the ring-type roasting furnace (the flue gas temperature around the metal crucible is uncontrollable, the flue gas flow velocity is uncontrollable, and the heat of the flue gas heats the products indirectly through the crucible and the filler, etc.).

[0084] For such a traditional roasting furnace, when the discharged pitch flue gas is collected through the furnace cover, a large amount of air will be mixed in, which not only reduces the quality of the fuel gas used, but also easily causes explosion safety accidents. Generally, it is incinerated and purified, and very little heat is recycled. In addition, it is impossible to perform pressure roasting on the products located in the furnace body, and it is impossible to effectively utilize the internal space of the furnace body to effectively collect the pitch flue gas and perform feedback regulation of the temperature signal on the basis of completing pressure roasting. Therefore, compared with the traditional roasting furnace, changing to the carbon product sintering system and method proposed in this application can effectively improve the above-mentioned defects.

[0085] The basic concepts have been described above. Obviously, for those skilled in the art, the above application disclosure is only an example and does not constitute a limitation to this application. Although not explicitly stated here, those skilled in the art may make various modifications, improvements, and corrections to this application. Such modifications, improvements, and corrections are suggested in this application, so such modifications, improvements, and corrections still fall within the spirit and scope of the exemplary embodiments of this application.

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

[0087] Some aspects of this application, such as the transformer control device, can be executed entirely by hardware, can be executed entirely by software (including firmware, resident software, microcode, etc.), or can be executed by a combination of hardware and software. The above hardware or software can all be referred to as "data block", "module", "engine", "unit", "component", or "system". The processor can be one or more application specific integrated circuits (ASIC), digital signal processors (DSP), digital signal processing devices (DAPD), programmable logic devices (PLD), field programmable gate arrays (FPGA), processors, controllers, microcontrollers, microprocessors, or a combination thereof. In addition, aspects of this application may be embodied as a computer product located in one or more computer-readable media, which includes computer-readable program code. For example, the computer-readable media can include, but is not limited to, magnetic storage devices (such as hard disks, floppy disks, magnetic tapes...), optical discs (such as compact disc CD, digital versatile disc DVD...), smart cards, and flash memory devices (such as cards, sticks, key drives...).

[0088] The computer-readable media may contain a propagated data signal containing computer program code, such as on a baseband or as part of a carrier wave. The propagated signal may have various forms of representation, including electromagnetic form, optical form, etc., or a suitable combination of forms. The computer-readable media can be any computer-readable media other than a computer-readable storage media, which can be connected to an instruction execution system, apparatus, or device to implement communication, propagation, or transmission for use of the program. The program code located on the computer-readable media can be propagated through any suitable media, including radio, cable, fiber optic cable, radio frequency signal, or similar media, or any combination of the above media.

[0089] Similarly, it should be noted that, in order to simplify the description disclosed in this application and thus help the understanding of one or more embodiments of the application, in the foregoing description of the embodiments of this application, sometimes multiple features are merged into one embodiment, drawing or description thereof. However, this disclosure method does not mean that the features required by the object of this application are more than those mentioned in the claims. In fact, the features of the embodiments are less than all the features of the single embodiment disclosed above.

[0090] In some embodiments, numbers are used to describe components and the quantity of attributes. It should be understood that such numbers used for the description of embodiments are modified by the modifiers "about", "approximately" or "substantially" in some examples. Unless otherwise stated, "about", "approximately" or "substantially" indicate that the said numbers allow a variation of ±20%. Accordingly, in some embodiments, the numerical parameters used in the specification and claims are approximate values, and such approximate values may vary according to the characteristics required by individual embodiments. In some embodiments, the numerical parameters should consider the specified significant digits and adopt the method of retaining the general number of digits. Although the numerical ranges and parameters used in some embodiments of this application to confirm the breadth of their scope are approximate values, in specific embodiments, the setting of such numerical values is as precise as possible within the feasible range.

[0091] Although this application has been described with reference to the current specific embodiments, those of ordinary skill in the art should recognize that the above embodiments are only used to illustrate this application, and various equivalent changes or substitutions can be made without departing from the spirit of this application. Therefore, as long as the changes and modifications of the above embodiments are within the scope of the spirit of this application, they will fall within the scope of the claims of this application.

Claims

1. A carbon product sintering system, characterized in that, Comprising: A carbon product sintering furnace, including a furnace body for accommodating one or more green blanks to be sintered, with resistance material filled around the green blanks; A plurality of thermocouples adapted to be arranged in the resistance material, the thermocouples being adapted to feedback temperature signals from the furnace body, wherein the plurality of thermocouples include a temperature control thermocouple located at the central position of the furnace body and one or more temperature measuring thermocouples distributed in other areas of the furnace body; A power supply adapted to supply power to the carbon product sintering furnace according to electrical output parameters, so that the resistance material generates heat to sinter the green blanks; and A power supply control device that receives a first temperature signal containing the temperature control temperature feedback by the temperature control thermocouple and a second temperature signal containing the temperature measurement temperature feedback by the plurality of temperature measuring thermocouples, calculates the temperature difference between the temperature control temperature and each of the temperature measurement temperatures, and controls the power supply to adjust the electrical output parameters according to the comparison relationship between the temperature difference and a threshold value.

2. The system according to claim 1, wherein The carbon product sintering furnace further includes a refractory furnace wall that at least partially surrounds the furnace body, wherein the material of the refractory furnace wall is clay.

3. The system according to claim 2, wherein The carbon product sintering furnace further includes a support frame fixedly connected to the furnace wall.

4. The system according to claim 1, wherein The carbon product sintering furnace further includes a base located below the furnace body.

5. The system according to claim 1, wherein The resistance material includes first-class coke particles with a particle size of 5 mm to 8 mm, and the first-class coke particles include calcined petroleum coke particles and / or graphitized coke particles.

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

7. The system according to claim 6, characterized in that It further includes a heat insulation material layer located above the furnace body, or simultaneously above and below the furnace body, or simultaneously above, below and around the furnace body. The heat insulation material layer includes second-class coke particles with a particle size of 0 to 2 mm, and the second-class coke particles include calcined petroleum coke particles and / or graphitized coke particles.

8. The system according to claim 7, wherein The content of the second-class coke particles with a particle size of less than 0.5 mm is not more than 40%.

9. The system according to claim 7, characterized in that, When the furnace body operates, it generates flue gas, and the furnace cover further includes an exhaust passage adapted for the flow of the flue gas. Among them, The heat insulation material layer further includes first-class coke particles with a particle size of 5 mm to 8 mm, and the first-class coke particles include calcined petroleum coke particles and / or graphitized coke particles; The first-class coke particles form a coarse coke particle area with a diameter of 250 mm to 500 mm in the heat insulation material layer; and The coarse coke particle area corresponds to the exhaust passage in the furnace cover in the flow direction of the flue gas.

10. The system according to claim 9, wherein The system further includes a green blank production device, and the system is further configured to transport the flue gas discharged through the exhaust passage to the green blank production device to be used as the heating heat source of the heat transfer oil during the production of the green blanks.

11. The system according to any one of claims 1 to 10, characterized in that, The power supply control device is further configured to: When the temperature difference is higher than the threshold value, control the power supply to maintain the current electrical output parameters unchanged until the temperature difference is lower than or equal to the threshold value; When the temperature difference is lower than or equal to the threshold value, 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.

12. The system according to claim 11, wherein The power supply is configured with an on-load voltage regulating switch having more than 200 levels, and the power supply is adapted to adjust the electrical output parameters through the on-load voltage regulating switch.

13. A method for sintering carbon products, characterized in that, Applicable to a carbon product sintering system, the carbon product sintering system having a carbon product sintering furnace, a power supply, and a power supply control device, the method comprising the following steps: Load one or more green blanks to be sintered into the furnace body of the carbon product sintering furnace, and at the same time fill resistance material around the green blanks; Place a plurality of thermocouples in the resistance material, the plurality of thermocouples including a temperature control thermocouple located at the center position of the furnace body and one or more temperature measuring thermocouples distributed in other areas of the furnace body; Start the power supply control device and the power supply so that the carbon product sintering system starts to operate; Receive a first temperature signal including a temperature control temperature feedback by the temperature control thermocouple, and a second temperature signal including a temperature measurement temperature feedback by the plurality of 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 the threshold value; supply power to the carbon product sintering furnace by the power supply according to the electrical output parameters, so that the resistance material generates heat to sinter the green blanks.

14. The method according to claim 13, characterized in that, In the step of loading one or more green blanks to be sintered into the furnace body, load the plurality of green blanks to be sintered into the furnace body at a consistent spacing.

15. The method according to claim 13, characterized in that, The resistance material includes calcined petroleum coke particles and / or graphitized coke particles, and the method further includes screening and mixing the calcined petroleum coke particles and / or the graphitized coke particles before filling the resistance material.

16. The method according to claim 13, wherein The step of placing one or more thermocouples in the resistance material further includes: Placing the thermocouple while filling the resistance material; or Placing a protective tube while filling the resistance material, and placing the one or more thermocouples in the corresponding protective tubes before starting the power supply control device and the power supply.

17. The method according to any one of claims 13 to 16, characterized in that, Further includes: When the temperature difference is higher than the threshold value, control the power supply to maintain the current electrical output parameters unchanged until the temperature difference is lower than or equal to the threshold value; When the temperature difference is lower than or equal to the threshold value, 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.

18. The method according to claim 17, wherein Further includes recording, during the sintering process of the current green blanks, the temperature deviation situation where the temperature difference between the temperature measurement temperature and the temperature control temperature feedback by each of the temperature measuring thermocouples is higher than the threshold value, and adjusting the position of the temperature measuring thermocouples in the furnace body according to the temperature deviation situation during the next sintering process of the green blanks.

19. A carbon product, characterized in that, Sinter using the carbon product sintering method according to any one of claims 13 to 18.

20. A carbon graphite product, characterized in that, Obtained by subjecting the carbon product according to claim 19 to an impregnation baking process and a graphitization process.

21. The carbon graphite product according to claim 20, wherein, The dipping and baking process includes dipping and secondary electric baking, and / or the graphitization process includes high-temperature graphitization treatment at a temperature above 2500 degrees Celsius.

22. The carbon graphite product according to claim 20, wherein, The carbon product includes special carbon products.

23. The carbon graphite product according to claim 22, characterized in that, The special carbon products include isostatic graphite.

24. The carbon graphite product according to claim 22, characterized in that, The size parameter of the special carbon graphite product is greater than 500 mm.

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