Exhaust system of porous carbon alkali activation furnace

Abstract

The invention discloses an exhaust system of a porous carbon alkali activation furnace, which comprises an exhaust pipe arranged at the top of a furnace chamber along the vertical direction so as to realize the discharge of tail gas containing potassium steam in the furnace chamber, and a reaction pipe obliquely arranged along the horizontal direction, the gas inlet end of the reaction pipe is communicated with the upper part of the exhaust pipe, and the upper part of the exhaust end of the reaction pipe is provided with a discharge pipe. A deposition pipe with a control valve is arranged at the lower part of the exhaust end of the reaction pipe, and a CO2 inlet is formed in the side part of the gas inlet end of the reaction pipe, so that potassium-containing steam reacts with CO2 in the reaction pipe to generate potassium carbonate, the potassium carbonate is collected into the deposition pipe, and reacted tail gas is discharged through a discharge pipe. The device has the characteristics of compact structure, convenience in operation, high reliability and the like, solves the problem of blockage of the exhaust pipeline, and effectively avoids the risk of deflagration of metal potassium.

Description

Technical Field

[0001] This invention relates to the field of lithium battery manufacturing technology, specifically to an exhaust system for a porous carbon-alkali activation furnace. Background Technology

[0002] Silicon-carbon anode materials, due to their high energy density, are currently the core raw material for the preparation of next-generation lithium batteries and have enormous market potential. Porous carbon forms the framework of novel silicon-carbon anode materials. The preparation of high-end porous carbon typically employs an alkaline activation process, which involves adding potassium hydroxide and carbon powder to an alkaline activation furnace for a high-temperature reaction. During the reaction, a large amount of potassium vapor is released. This vapor condenses in the exhaust pipe, forming metallic potassium, which can cause blockages. Furthermore, because metallic potassium is chemically highly reactive, flammable, and explosive, its accumulation in the exhaust pipe poses a risk of combustion and explosion.

[0003] Existing alkali activation furnaces typically have a scraper at the exhaust port on the furnace top. When the exhaust port becomes blocked, the condensate is scraped directly into the furnace cavity by the scraper. This approach may result in the sintered products being contaminated by falling debris, and the condensate scraped into the furnace cavity requires disassembly for removal, increasing the difficulty of later equipment maintenance.

[0004] Furthermore, existing alkali activation furnaces typically absorb potassium vapor by introducing carbon dioxide gas into pipes. These pipes need to be designed with one operating pipe and one backup pipe. When a pipe becomes clogged by continuously generated potassium salts, the process switches to the backup pipe, while the clogged pipe is disassembled and cleaned, repeating this process. This approach requires frequent disassembly and cleaning of the exhaust pipes, resulting in high labor costs and complex operation. The two sets of pipes also significantly increase the equipment cost, hindering industrialization. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to address the shortcomings of existing alkali activation furnaces, which require frequent manual cleaning of exhaust pipes and lack proper treatment of condensate. The present invention provides an exhaust system for a porous carbon-alkali activation furnace that is compact, easy to operate, and conducive to improving production capacity.

[0006] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is as follows: An exhaust system for a porous carbon-alkali activation furnace includes an exhaust pipe vertically positioned at the top of the furnace chamber to discharge potassium-containing vapors from the furnace chamber, and a reaction pipe horizontally inclined at an inlet end connected to the upper part of the exhaust pipe. The upper part of the exhaust end of the reaction pipe is provided with a discharge pipe, and the lower part of the exhaust end of the reaction pipe is provided with a deposition pipe equipped with a control valve. A CO2 inlet is provided on the side of the inlet end of the reaction pipe to allow potassium-containing vapors to react with CO2 within the reaction pipe to generate potassium carbonate, which is then collected in the deposition pipe. The exhaust gas after the reaction is discharged through the discharge pipe.

[0007] As a further improvement of the present invention, a scraper assembly is provided inside the reaction tube, which is used to scrape off potassium carbonate adhering to the inner wall of the reaction tube.

[0008] As a further improvement of the present invention, the scraper assembly includes a blade head, a blade belly, and a blade shaft. The blade shaft coincides with the axis of the reaction tube, and the blade head and the blade shaft are arranged in parallel. One end of the blade shaft is connected and fixed to the blade head through the blade belly, and the other end of the blade shaft is sealed and extends through the outside of the reaction tube and is connected to the drive assembly. Under the drive of the drive assembly, the blade shaft drives the blade head to rotate along the inner wall of the reaction tube to scrape off the potassium carbonate adhering to the inner wall of the reaction tube.

[0009] As a further improvement of the present invention, the scraper assembly further includes a packing and a bearing. The packing is disposed at the connection between the scraper shaft and the reaction tube to achieve a sealed connection between the scraper shaft and the reaction tube, and the bearing is used to achieve a rotatable connection between the scraper shaft and the drive assembly.

[0010] As a further improvement of the present invention, the drive assembly includes a coupling and a motor, wherein the output shaft of the motor is rotatably connected to the cutter shaft via the coupling.

[0011] As a further improvement of the present invention, the exhaust pipe is fully enclosed by an electric auxiliary heating component to ensure that potassium-containing vapor is maintained in a gaseous state and discharged into the reaction tube within the exhaust pipe.

[0012] As a further improvement of the present invention, the bottom of the deposition tube is provided with a ash receiving box, and the control valve is used to control the connection and disconnection between the deposition tube and the ash receiving box.

[0013] As a further improvement of the present invention, the side of the deposition tube is provided with an N2 inlet, which is located between the control valve and the ash collection box; when the control valve is opened, nitrogen gas is introduced into the deposition tube through the N2 inlet.

[0014] As a further improvement of the present invention, the side of the ash receiving box is provided with a quick-opening.

[0015] Compared with the prior art, the advantages of the present invention are as follows: The exhaust system of the porous carbon-alkali activation furnace of the present invention achieves the external discharge of potassium-containing vapor tail gas by setting the exhaust pipe vertically at the top of the furnace cavity. At the same time, a reaction tube inclined horizontally is also set, with the inlet end of the reaction tube connected to the upper part of the exhaust pipe, so that the potassium-containing vapor tail gas enters the reaction tube. By setting a CO2 inlet on the side of the inlet end of the reaction tube, the potassium-containing vapor and CO2 react in the reaction tube to generate potassium carbonate, so that potassium ions are intercepted and consumed, effectively suppressing the production of metallic potassium. Furthermore, the potassium carbonate generated by the reaction can be collected in the deposition tube, and the exhaust gas after the reaction is discharged through the exhaust pipe. This solves the problems of blockage and potassium explosion that are prone to occur in the exhaust system of traditional porous carbon-alkali activation furnaces, and improves the safety and reliability of the porous carbon-alkali activation furnace operation. Attached Figure Description

[0016] Figure 1 This is a schematic diagram illustrating the structural principle of the exhaust system of the porous carbon-alkali activation furnace in a specific embodiment of the present invention; Figure 2 This is a schematic diagram illustrating the structural principle of the scraper assembly in a specific embodiment of the present invention.

[0017] Legend: 1. Furnace body; 2. Furnace cavity; 3. Exhaust pipe; 4. Electric auxiliary heating component; 5. Reaction tube; 6. CO2 inlet; 7. Scraper assembly; 8. Coupling; 9. Motor; 10. Deposition tube; 11. Control valve; 12. N2 inlet; 13. Ash collection box; 14. Discharge pipe; 15. Quick-opening door; 71. Scraper head; 72. Scraper belly; 73. Scraper shaft; 74. Packing; 75. Bearing. Detailed Implementation

[0018] The present invention will be further described below with reference to the accompanying drawings and specific preferred embodiments, but this does not limit the scope of protection of the present invention.

[0019] In the description of this invention, it should be understood that the terms "side", "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 invention and simplifying the description, and are not intended to 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 invention.

[0020] 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 one or more of that feature. In the description of this invention, "a plurality of" means two or more unless otherwise explicitly specified.

[0021] Example like Figure 1 As shown, the exhaust system of the porous carbon-alkali activation furnace of the present invention includes an exhaust pipe 3 vertically arranged at the top of the furnace chamber 2 to discharge the potassium vapor-containing tail gas from the furnace chamber 2, and a reaction tube 5 inclined horizontally. The furnace body 1 maintains the working temperature of the furnace chamber 2 at 800~900℃. During the process, a large amount of potassium vapor is generated in the furnace chamber 2 and discharged from the exhaust pipe 3 at the top of the furnace chamber 2. Since the boiling point of potassium is 774℃, in order to prevent the gas from cooling down rapidly and condensing after entering the exhaust pipe 3, the exhaust pipe 3 is completely surrounded by an electric auxiliary heating component 4 to ensure that the potassium vapor is maintained in a gaseous state in the exhaust pipe 3 and discharged into the reaction tube 5, thus ensuring that the exhaust pipe 3 is unobstructed. The inlet end of the reaction pipe 5 is connected to the upper part of the exhaust pipe 3. The upper part of the exhaust end of the reaction pipe 5 is provided with an exhaust pipe 14. The lower part of the exhaust end of the reaction pipe 5 is provided with a sedimentation pipe 10 with a control valve 11. The side of the inlet end of the reaction pipe 5 is provided with a CO2 inlet 6 so as to realize that potassium vapor and CO2 react fully in the reaction pipe 5 to generate potassium carbonate, which is collected in the sedimentation pipe 10. The exhaust gas after the reaction is discharged through the exhaust pipe 14.

[0022] In this embodiment, the reaction tube 5 is set at a certain tilt angle, and the gas inlet end of the reaction tube 5 is higher than the gas outlet end, which facilitates the deposition of potassium salt into the deposition tube 10, and at the same time prevents potassium salt from flowing back into the furnace chamber 2; after sufficient reaction and deposition, the gas has basically removed the potassium and is finally discharged through the outlet pipe 14, which greatly improves the production efficiency of the equipment.

[0023] In this embodiment, a ash collection box 13 is provided at the bottom of the deposition pipe 10. The control valve 11 is used to control the opening and closing of the deposition pipe 10 and the ash collection box 13, which can realize the effective collection of potassium salt and convenient online cleaning without affecting the overall production operation of the equipment. At the same time, a quick-opening opening 15 is provided on the side of the ash collection box 13 to facilitate quick cleaning of the ash collection box 13. The control valve 11 can be a gate valve, which has a simple structure and precise control.

[0024] In this embodiment, the exhaust pipe 3 is made of SUS310S stainless steel, which can withstand temperatures above 800°C. The reaction pipe 5, sedimentation pipe 10, control valve 11, ash collection box 13 and outlet pipe 14 are all made of SUS316L stainless steel, which can withstand potassium salt corrosion.

[0025] Furthermore, the deposition tube 10 is provided with an N2 inlet 12 on its side, which is located between the control valve 11 and the ash collection box 13. When the control valve 11 is opened to clean the deposition tube 10, sufficient nitrogen gas is introduced into the deposition tube 10 through the N2 inlet 12 to prevent air from being introduced into the pipeline system during the cleaning process and causing the risk of potassium explosion.

[0026] As the process progresses, exhaust gas is continuously discharged from furnace chamber 2, and a large amount of solid potassium salt is generated in reaction tube 5. To prevent blockage in the pipe, such as Figure 1 As shown, a scraper assembly 7 is provided inside the reaction tube 5. The scraper assembly 7 can scrape off the potassium carbonate adhering to the inner wall of the reaction tube 5 by rotating and stirring, so as to prevent the potassium carbonate from adhering and affecting the normal ventilation of the reaction tube 5.

[0027] like Figure 2 As shown, the scraper assembly 7 includes a blade head 71, a blade belly 72, and a blade shaft 73. The blade shaft 73 coincides with the axis of the reaction tube 5. The blade head 71 and the blade shaft 73 are arranged in parallel. One end of the blade shaft 73 is connected and fixed to the blade head 71 through the blade belly 72, and the other end of the blade shaft 73 is sealed and extends through the outside of the reaction tube 5, connecting to the drive assembly. Driven by the drive assembly, the blade shaft 73 drives the blade head 71 to rotate along the inner wall of the reaction tube 5 to scrape off the potassium carbonate adhering to the inner wall of the reaction tube 5.

[0028] Furthermore, the scraper assembly 7 also includes a packing 74 and a bearing 75. The packing 74 is located at the connection between the cutter shaft 73 and the reaction tube 5 to achieve a sealed connection between the cutter shaft 73 and the reaction tube 5. The bearing 75 is used to achieve a rotatable connection between the cutter shaft 73 and the drive assembly to ensure that the cutter shaft 73 drives the cutter head 71 to rotate smoothly.

[0029] In this embodiment, the drive assembly includes a coupling 8 and a motor 9. The output shaft of the motor 9 is rotatably connected to the cutter shaft 73 through the coupling 8, so that the motor 9 drives the cutter shaft 73 to rotate, causing the cutter head 71 to rotate around the tube axis of the reaction tube 5, scraping away the accumulated dust inside the tube and keeping the tube unobstructed.

[0030] In this embodiment, the blade head 71, blade belly 72, and blade shaft 73 are all made of SUS316L stainless steel, which is resistant to potassium salt corrosion. The packing 74 is made of ceramic fiber, and the bearing 75 is a deep groove ball bearing, ensuring that the scraper assembly 7 operates stably in high temperature and high potassium environments.

[0031] The above description is merely a preferred embodiment of the present invention. The scope of protection of the present invention is not limited to the above embodiments. All technical solutions falling within the scope of the present invention's concept are within the scope of protection of the present invention. It should be noted that for those skilled in the art, any improvements and modifications made without departing from the principles of the present invention should also be considered within the scope of protection of the present invention.

Claims

1. An exhaust system for a porous carbon-alkali activation furnace, characterized in that, It includes an exhaust pipe (3) set vertically at the top of the furnace cavity (2) to realize the exhaust of potassium vapor in the furnace cavity (2) and a reaction pipe (5) set horizontally. The inlet end of the reaction pipe (5) is connected to the upper part of the exhaust pipe (3). The upper part of the exhaust end of the reaction pipe (5) is provided with a discharge pipe (14). The lower part of the exhaust end of the reaction pipe (5) is provided with a deposition pipe (10) with a control valve (11). The side of the inlet end of the reaction pipe (5) is provided with a CO2 inlet (6) to realize the reaction of potassium vapor and CO2 in the reaction pipe (5) to generate potassium carbonate, which is collected in the deposition pipe (10). The exhaust gas after the reaction is discharged through the discharge pipe (14).

2. The exhaust system of the porous carbon-alkali activation furnace according to claim 1, characterized in that, The reaction tube (5) is provided with a scraper assembly (7), which is used to scrape off potassium carbonate adhering to the inner wall of the reaction tube (5).

3. The exhaust system of the porous carbon-alkali activation furnace according to claim 2, characterized in that, The scraper assembly (7) includes a blade head (71), a blade belly (72), and a blade shaft (73). The blade shaft (73) coincides with the axis of the reaction tube (5). The blade head (71) and the blade shaft (73) are arranged in parallel. One end of the blade shaft (73) is connected and fixed to the blade head (71) through the blade belly (72). The other end of the blade shaft (73) is sealed and extends through the outside of the reaction tube (5) and is connected to the drive assembly. Under the drive of the drive assembly, the blade shaft (73) drives the blade head (71) to rotate along the inner wall of the reaction tube (5) to scrape off the potassium carbonate adhering to the inner wall of the reaction tube (5).

4. The exhaust system of the porous carbon-alkali activation furnace according to claim 3, characterized in that, The scraper assembly (7) also includes a packing (74) and a bearing (75). The packing (74) is located at the connection between the cutter shaft (73) and the reaction tube (5) to achieve a sealed connection between the cutter shaft (73) and the reaction tube (5). The bearing (75) is used to achieve a rotatable connection between the cutter shaft (73) and the drive assembly.

5. The exhaust system of the porous carbon-alkali activation furnace according to claim 3, characterized in that, The drive assembly includes a coupling (8) and a motor (9), the output shaft of which is rotatably connected to the cutter shaft (73) via the coupling (8).

6. The exhaust system of the porous carbon-alkali activation furnace according to any one of claims 1 to 5, characterized in that, The exhaust pipe (3) is fully enclosed by an electric auxiliary heating component (4) to ensure that potassium vapor is maintained in a gaseous state within the exhaust pipe (3) and discharged into the reaction tube (5).

7. The exhaust system of the porous carbon-alkali activation furnace according to any one of claims 1 to 5, characterized in that, The bottom of the deposition tube (10) is provided with a ash receiving box (13), and the control valve (11) is used to control the connection and disconnection between the deposition tube (10) and the ash receiving box (13).

8. The exhaust system of the porous carbon-alkali activation furnace according to claim 7, characterized in that, The deposition tube (10) is provided with an N2 inlet (12) on its side. The N2 inlet (12) is located between the control valve (11) and the ash collection box (13). When the control valve (11) is opened, nitrogen gas is introduced into the deposition tube (10) through the N2 inlet (12).

9. The exhaust system of the porous carbon-alkali activation furnace according to claim 7, characterized in that, The ash receiving box (13) is provided with a quick-opening door (15) on the side.

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