A vertical graphitization furnace smoke exhaust and ventilation device

Abstract

The utility model discloses a kind of smoke exhaust and ventilation device of vertical graphitization furnace, including the smoke outlet of being arranged at the top of preheating zone of furnace body, annular duct and annular duct air hole being arranged at heating zone and high temperature zone of furnace body, and the ventilation pipe being arranged at the cooling and discharging structure of furnace body, the annular duct air hole and ventilation pipe are connected with external gas source respectively.Solution is designed through the annular duct air hole of different position, so that material is not easy to block pipeline, it is beneficial to the uniform distribution of gas, improve the effect of any kind of gas, the setting of air hole directly contacting with material, so that process is simpler, thereby reduce the consumption of gas.

Description

Technical Field

[0001] This utility model relates to the field of graphitization furnace technology, specifically to a vertical graphitization furnace exhaust and ventilation device. Background Technology

[0002] With the development of the global new energy industry, there is a significant demand for new energy vehicles, energy storage devices, and consumer electronics, leading to a substantial increase in the demand for graphite anode materials. Currently, graphite is the mainstream anode material on the market. The graphitization process is a key factor affecting the quality and a major technical challenge for anode materials. However, excessive magnetic impurities in the final product can directly impact battery performance and safety, a problem that cannot be ignored.

[0003] At the high temperatures of graphitization, most impurities in carbon materials volatilize and are removed, but trace amounts remain. Many methods have been developed to remove these impurities and prepare graphite materials with very high purity. The currently used high-temperature treatment method involves maintaining a temperature of approximately 3000°C for an extended period, but the resulting products still contain carbides such as vanadium carbide and titanium carbide, which are difficult to volatilize and decompose. If chlorine or Freon is introduced into the furnace to react, the valuable metals in the material are transformed into compounds and complexes with lower melting and boiling points, which then escape, thus removing the impurities. Currently, this purification method is mostly used in batch graphitization furnaces, where halogen gases are transported into the furnace through graphite tubes to achieve graphite purification. However, during this process, the pipes are filled with coke, making them prone to blockage and hindering the purification process.

[0004] Compared with intermittent graphitization furnaces, continuous graphitization furnaces have many advantages, such as simpler processes, shorter production cycles, lower energy consumption, and reduced consumption of insulating materials. However, the material in a continuous graphitization furnace has a shorter residence time in the high-temperature zone, resulting in incomplete removal of impurities from the product. Therefore, we designed a novel vertical graphitization furnace exhaust and ventilation device to assist in purification and solve the above problems. Utility Model Content

[0005] Based on the above problems, this utility model provides a vertical graphitization furnace exhaust and ventilation device to solve the problem that continuous graphitization in the prior art cannot reach high temperatures and thus does not completely eliminate impurity elements.

[0006] To achieve the above objectives, this utility model adopts the following technical solution:

[0007] A vertical graphitization furnace exhaust and ventilation device includes an exhaust port at the top of the furnace heating zone, an annular pipe and an annular pipe ventilation hole in the furnace heating zone and high temperature zone, and a ventilation pipe in the furnace cooling discharge structure. The annular pipe ventilation hole and the ventilation pipe are respectively connected to an external air source.

[0008] Preferably, the exhaust port at the top of the heating zone is used to discharge the waste gas inside the furnace.

[0009] Preferably, the exhaust port is externally connected to a negative pressure device, which quickly discharges the flue gas or exhaust gas from the main body of the flue by drawing negative pressure.

[0010] It should be noted that the exhaust port is designed as a ring, and the inner ring surface of the exhaust port is provided with multiple exhaust port openings, which are evenly distributed around the inner ring. The diameter of the exhaust port openings is distributed in a gradient from large to small according to the distance from the main body of the flue. That is, the closer to the main body of the flue, the smaller the opening is, which can ensure that the flue gas is evenly discharged from all sides and avoid the accumulation of flue gas.

[0011] Preferably, the annular pipe in the heating zone and high-temperature zone is a closed pipe that wraps around the side wall. It has at least two evenly distributed vents and vent pipe openings on the inner side of the wall, and the annular pipe vent is connected to an external air source on the outer side of the wall. The vent pipe opening is designed as a slope with the slope facing downwards to prevent material from accumulating at the vent and reduce the ventilation speed.

[0012] Preferably, the vent hole of the annular pipe in the heating zone is located about 10cm above the material surface.

[0013] Preferably, the vent hole of the annular pipe in the high-temperature zone is located about 10cm below the heating device.

[0014] More preferably, the number of vents in the annular pipes of the heating zone and the high-temperature zone is 3 to 6, for example, 3, 4, 5 or 6.

[0015] Preferably, the gas introduced from the external gas source in different regions can be at least one of halogen gas, reducing gas, and inert gas, depending on the process requirements.

[0016] The halogen gas is at least one of chlorine, Freon, or fluorine.

[0017] The reducing gas is at least one of hydrogen, carbon monoxide, methane, and silane;

[0018] The inert gas is at least one of nitrogen, argon, or helium;

[0019] Adjust the type and proportion of gas according to the actual production of materials.

[0020] Preferably, an inert or reducing gas is introduced into the annular pipe of the heating zone to prevent the material from oxidizing.

[0021] Preferably, when the temperature inside the furnace in the high-temperature zone reaches about 1900-2300℃, halogen gases, such as Freon and chlorine, are introduced to transform the oxides of impurities into compounds with lower melting and boiling points, thereby reducing the impurity content.

[0022] Preferably, the discharge zone is equipped with a cooling discharge structure to cool the material before discharging it from the furnace body; the vent pipe is located between the upper gate valve and the lower gate valve; the vent pipe is used to introduce inert gas or reducing gas.

[0023] Preferably, the inert gas or reducing gas sprayed from bottom to top can not only remove oxygen from the furnace, but also completely remove the oxidizing gas remaining in the furnace, preventing the backflow of impurity gases.

[0024] In summary, due to the adoption of the above technical solution, the beneficial effects of this utility model are:

[0025] In this invention, the design of annular pipe vents and exhaust ports at different locations makes it less likely for materials to clog the pipes, which is conducive to uniform gas distribution, improves purification effect, and enhances product quality.

[0026] In this invention, an inert or reducing gas is introduced into the annular pipe in the heating zone to remove oxygen brought in by the feed and prevent the material from oxidizing during the heating process; a halogen gas is introduced into the annular pipe in the high-temperature zone to completely remove residual impurities from the material and improve product performance; an inert or reducing gas is introduced into the gate valve to not only remove residual purified gas in the furnace more quickly and protect the furnace atmosphere, but also to accelerate the cooling of the material.

[0027] In this invention, the vent directly contacts the material, eliminating the need to first introduce nitrogen and then halogen gas, thus simplifying the process, reducing gas consumption, and lowering production costs. Attached Figure Description

[0028] Figure 1 A schematic diagram of a graphitization furnace including smoke extraction and ventilation devices;

[0029] Figure 2 This is a schematic diagram of the vent structure of a ring-shaped pipe;

[0030] Figure 3 This is a schematic diagram of the smoke exhaust outlet structure;

[0031] The markings in the diagram are: 1-material surface in the heating zone, 2-heating device, 3-discharge zone, 4-exhaust port, 401-exhaust port opening, 5-vent hole in the annular pipe of the heating zone, 501-vent, 502-vent pipe opening, 6-vent hole in the annular pipe of the high-temperature zone, 7-vent pipe, 8-cooling discharge structure, 9-furnace body. Detailed Implementation

[0032] To enable those skilled in the art to better understand this utility model, it will be further described in detail below with reference to the accompanying drawings and the following embodiments. Many specific details are set forth in the following description to provide a full understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0033] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this application and simplifying the description, and 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 of this application.

[0034] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0035] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0036] It should be noted that when an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. When an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.

[0037] like Figure 1 As shown, a ventilation device for a vertical graphitization furnace includes a flue gas outlet 4 located at the top of the furnace heating zone; a heating zone annular pipe and a heating zone annular pipe ventilation hole 5 installed in the wall 10cm above the material surface 1; a high-temperature zone annular pipe and a high-temperature zone annular pipe ventilation hole 6 installed in the wall of the high-temperature zone, located 10cm below the heating device 2; and a closed pipe formed by two annular pipes wrapped around the side wall, each with six ventilation holes. Figure 1 (Not shown in the image), the annular pipe vent is connected to different external gas tanks; at the same time, a vent pipe 7 is provided in the discharge area 3, and the vent pipe 7 is connected to an external gas tank.

[0038] It should be noted that, as Figure 2 As shown, the vent 501 of the annular pipe is located inside the wall, and the vent 502 at its end is designed as a slope with the slope facing downwards, which can prevent material from accumulating in the vent and reduce the ventilation speed.

[0039] Furthermore, such as Figure 3 As shown, the exhaust port 4 is designed as a ring and connected to a negative pressure device. This device rapidly discharges smoke or exhaust gas from the main body of the flue by drawing negative pressure. The inner ring surface of the exhaust port 4 has multiple exhaust openings 401, evenly distributed around the inner ring. The diameter of each exhaust opening 401 decreases gradually from large to small based on its distance from the main body of the flue; that is, the closer to the main body of the flue, the smaller the opening, ensuring that the smoke is discharged evenly and smoothly from all sides, preventing smoke accumulation.

[0040] In another embodiment, such as Figure 1 As shown, a vertical graphitization furnace includes a furnace body 9 and the aforementioned exhaust ventilation device, wherein the exhaust ventilation device is disposed in the heating zone, high-temperature zone and cooling discharge structure 8 of the furnace body 9.

[0041] Working principle: Material enters the furnace body 9 through the feed inlet. Since raw material is always entering the feed inlet and it cannot be completely sealed, some oxygen still enters. After the material slowly heats up, inert gas (nitrogen) is introduced into the vent hole 5 of the annular pipe at the upper end of the material surface 1 of the heating zone to remove oxygen and prevent oxidation of the material. After passing through the high-temperature zone, when the temperature reaches the required temperature, purified gas (Freon and chlorine) is introduced into the vent hole 6 of the annular pipe at the high-temperature zone. After impurities are vaporized, they will drift to the exhaust port 4 at the top and be led out by the negative pressure device outside the exhaust port 4 to improve the impurity removal effect. After the material is kept at high temperature for a period of time, it enters the cooling discharge structure 8 for cooling. The final temperature drops below 100℃ and is discharged from the discharge zone 3. A vent pipe 7 is also set in the middle of the gate valve in the discharge zone 3 (not shown in the figure). Inert gas (nitrogen) is introduced into this pipe, which can not only remove the purified gas or impurity gas remaining in the furnace, but also accelerate the cooling of the material. In another embodiment, the type of gas at this location can be adjusted according to the actual material conditions. A reducing gas (hydrogen) can be introduced through the vent pipe 7 to prevent the material from being oxidized. The above design significantly improves the purity of the final product to meet market demands.

[0042] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included within the scope of the heating protection of the present invention.

Claims

1. A vertical graphitization furnace exhaust ventilation device, characterized in that, It includes a flue gas outlet located at the top of the furnace preheating zone, an annular pipe and an annular pipe vent located in the furnace heating zone and high temperature zone, and a vent pipe located in the furnace cooling discharge structure. The annular pipe vent and the vent pipe are respectively connected to an external air source.

2. The vertical graphitization furnace exhaust ventilation device according to claim 1, characterized in that, The exhaust port is designed as a ring, and its position is level with or slightly lower than the furnace cover. The inner ring surface of the exhaust port is provided with exhaust port openings, which are evenly distributed around the inner ring. The diameter of the exhaust port openings is distributed in a gradient from large to small according to the distance from the main body of the flue.

3. The vertical graphitization furnace exhaust ventilation device according to claim 1, characterized in that, The vent hole of the annular pipe in the heating zone is located 10cm above the material surface; the annular pipe structure is a closed pipe that wraps around the side wall, with no less than two evenly distributed vents and vent pipe openings on the inner side of the wall, and the annular pipe vent hole on the outer side of the wall is connected to an external air source.

4. The vertical graphitization furnace exhaust ventilation device according to claim 1, characterized in that, The high-temperature zone annular pipe vent is located 10cm below the heating device; the annular pipe structure is a closed pipe that wraps around the side wall, with no less than two evenly distributed vents and vent pipe openings on the inner side of the wall, and the annular pipe vent is located on the outer side of the wall to connect with an external air source.

5. A vertical graphitization furnace exhaust ventilation device according to claim 3 or 4, characterized in that, The vent is made of carbon material and is designed as a slope with the bevel facing downwards.

6. The vertical graphitization furnace exhaust ventilation device according to claim 1, characterized in that, The gas supplied by the external gas source is selected from at least one of halogen gas, reducing gas, and inert gas.

7. The vertical graphitization furnace exhaust ventilation device according to claim 6, characterized in that, The halogen gas is at least one of chlorine, Freon, or fluorine; and / or the reducing gas is at least one of hydrogen, carbon monoxide, methane, or silane; and / or the inert gas is at least one of nitrogen, argon, or helium.

8. The vertical graphitization furnace exhaust ventilation device according to claim 1, characterized in that, The annular pipe in the heating zone is circulated with an inert gas or a reducing gas to prevent oxidation of the material; and / or, When the furnace temperature in the high-temperature zone is 1900-2300℃, halogen gas or reducing gas is introduced into the annular pipe in the high-temperature zone to reduce impurity elements.

9. The vertical graphitization furnace exhaust ventilation device according to claim 1, characterized in that, The furnace cooling and discharge structure is equipped with a vent pipe, which is located between the upper gate valve and the lower gate valve; the vent pipe is used to introduce inert gas or reducing gas.

10. A vertical graphitization furnace exhaust ventilation device according to claim 9, characterized in that, The inert gas or reducing gas is injected from bottom to top to remove oxygen and oxidizing gases from the furnace.

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