System for recycling tail gas and dust in pre-carbonized negative electrode material of rotary kiln

Abstract

The utility model provides a system for recycling tail gas and dust in a pre-carbonized negative electrode material of a rotary kiln, which belongs to the technical field of petrochemical engineering and comprises a rotary kiln furnace end for recycling dust and utilizing tail gas, a smoke exhaust pipe, a scraper assembly, a smoke dust settling chamber, a tar trapper, a buffer tank, a Roots blower and a water-sealed tank, and the tar trapper, the buffer tank, the Roots blower and the water-sealed tank are sequentially communicated with one another. The discharging buffering bin is used for recycling sensible heat of materials and rapidly cooling the materials, the smoke exhaust pipe extends into the smoke dust settling chamber, the smoke exhaust pipe and the smoke dust settling chamber are arranged in a closed mode, the scraper assembly is arranged in the smoke exhaust pipe, and the discharging buffering bin and the drum-type cooler are arranged in the smoke dust settling chamber. Materials attached to the inner wall of the smoke discharging cylinder are removed through the scraper blade assembly, most of dust in tail gas can reduce the drift speed, collide with one another and be caked, the dust is deposited at the bottom of the smoke dust settling chamber under the action of gravity and then enters the discharging buffering bin, and the recovery rate of coke powder in the tail gas is increased.

Description

Technical Field

[0001] The present application belongs to the field of petrochemical engineering technology, and in particular relates to a system for recycling tail gas and dust from pre-carbonized negative electrode materials in a rotary kiln. Background Art

[0002] In recent years, the rapid development of new energy and the nation's enormous demand for electrical energy storage have led to explosive growth in the production of various battery products. However, the raw material required for the battery's negative electrode (hereinafter referred to as raw coke) must undergo a pre-carbonization process before entering the graphitization furnace. This process removes volatiles, increases the raw coke's graphitization rate, and reduces graphitization costs.

[0003] Currently, there are two main methods for pre-carbonizing the raw coke to improve the graphitization filling rate before graphitization of the negative electrode raw materials used in the market:

[0004] One method involves loading the raw coke into a sagger, then passing it through a gas-fired tunnel kiln to heat the sagger and pre-carbonize the raw coke. However, this method has disadvantages such as low production efficiency, large equipment footprint, high investment in automation equipment and supporting costs, and high sagger wear.

[0005] The second approach is to pre-carbonize the raw coke using a closed rotary kiln burner. This method not only significantly improves production efficiency but also significantly reduces equipment investment and operating costs, making it a promising approach for widespread adoption. However, this method presents several challenges in treating kiln exhaust gas. First, the average particle size of the raw coke is only 10.1-28.6 μm. Furthermore, the raw coke contains 5-8% volatile matter and tar. Because the coke fines are extremely fine, approximately 3-8% of the coke fines are mixed with the vapors of the volatile matter and tar during the pre-carbonization heating process. Under the influence of heat, these particles drift along the flue of the rotary kiln burner toward the exhaust port. During this process, the tar condenses upon cooling, coating some of the coke fines, depositing or adhering to the exhaust pipe walls, easily clogging the flue and affecting the safe and stable operation of the kiln. Furthermore, due to the high value of the raw coke fines, the raw coke fines mixed in the high-temperature exhaust gas are difficult to separate and recover. Consequently, each ton of raw coke pre-carbonized results in a loss of hundreds of yuan in value. Furthermore, the discharge temperature of the calcined raw coke is around 900-1000°C, containing approximately 790,000 kcal of heat per ton. Due to the fine particle size of the coke powder, heat dissipation is extremely slow. Furthermore, at high temperatures, contact with air can cause spontaneous combustion and oxidation. Therefore, cooling must be performed in a water-jacketed container. Rapidly cooling the raw coke, which contains such a large amount of heat energy, to room temperature not only consumes a large amount of cooling water but also significantly wastes energy.

[0006] Furthermore, during pre-carbonization, each ton of raw coke produces approximately 120-160 m³ of flammable methane and ethane gases, each containing approximately 520,000 kcal of volatile matter. This calorific value is even higher when the coke fines entrained within the gases are included. Due to the equipment investment and safety risks associated with direct recycling, current rotary kiln pre-carbonization processes typically ignite and discharge the dust-laden exhaust directly. This wastes valuable resources and increases environmental pollution. To address this issue, some large companies recycle converter exhaust gas by scrubbing and purifying it before transferring it to large gas storage tanks using Roots blowers for storage and reuse. This method not only requires significant investment, but also significantly increases safety management costs due to the large gas storage tanks, which represent a significant source of danger.

[0007] Therefore, in order to solve the difficult problems in the production of raw coke pre-carbonization using a rotary kiln burner (blockage of the rotary kiln burner exhaust pipe and low recovery rate of coke powder in the tail gas), it is necessary to design a device that can safely recover and efficiently utilize the volatile components (such as tail gas, coke powder, tar, and sensible heat of raw coke) in the production process of rotary kiln burner pre-carbonization of raw coke. Utility Model Content

[0008] Based on this, the utility model provides a system for recycling tail gas and dust from pre-carbonized negative electrode materials in a rotary kiln to solve the technical problem in the prior art that tail gas and dust from pre-carbonized negative electrode materials in a rotary kiln head clog the exhaust pipe.

[0009] The technical solution of the utility model to solve the above technical problems is as follows:

[0010] A system for recycling exhaust gas and dust from pre-carbonized negative electrode materials in a rotary kiln, comprising a rotary kiln furnace head, a smoke exhaust pipe, a scraper assembly, a smoke dust settling chamber, and a tar catcher, a buffer tank, a Roots blower, and a water seal tank connected in sequence for recycling dust and utilizing exhaust gas, and also comprising a discharge buffer bin and a drum cooler for recycling sensible heat of materials and rapidly cooling materials, the smoke exhaust pipe extending into the smoke dust settling chamber, and the smoke exhaust pipe and the smoke dust settling chamber being sealed, the scraper assembly being arranged in the smoke exhaust pipe, the scraper assembly being in contact with the inner wall of the smoke exhaust pipe, and being able to rotate in the smoke exhaust pipe; a dust recovery pipe being provided at the bottom of the smoke dust settling chamber, the dust recovery pipe being connected to the discharge buffer bin, and the tar catcher being connected to the smoke dust settling chamber.

[0011] Preferably, the scraper assembly includes a drive motor, a connecting rod and a scraper. The drive motor is arranged outside the smoke settling chamber. The drive motor is connected to the connecting rod, passes through the smoke settling chamber and extends into the smoke exhaust pipe. The scraper is mounted on the connecting rod and contacts the inner wall of the smoke exhaust pipe.

[0012] Preferably, the scraper assembly further includes a shaft sleeve and a mounting plate, the shaft sleeve is detachably mounted on the connecting rod, the mounting plate is arranged on the shaft sleeve, and the scraper is detachably connected to the mounting plate.

[0013] Preferably, a plurality of partitions are evenly arranged at a preset distance in the smoke settling chamber, and adjacent partitions are staggered in sequence to form a transverse S-shaped channel.

[0014] Preferably, a first spiral pusher is provided in the dust recovery pipe.

[0015] Preferably, a star-shaped discharger is provided at the outlet of the discharge buffer bin, and the star-shaped discharger is connected to the drum cooler through a material flow pipe.

[0016] Preferably, a second spiral pusher is provided in the material circulation pipe.

[0017] Preferably, it also includes a cooling mechanism, which includes a circulating water pump, a cooling coil and a cooling jacket. The cooling coil is arranged in the discharge buffer bin and is attached to the inner wall of the discharge buffer bin. The cooling jacket is arranged on the drum cooler and is attached to the outer wall of the drum cooler.

[0018] Preferably, the drum cooler further includes a first sealing cover and a second sealing cover, the first sealing cover and the second sealing cover are symmetrically arranged at both ends of the drum cooler and are sealed, and the drum cooler can rotate between the first sealing cover and the second sealing cover, the first sealing cover is provided with a feed port and a water inlet, the feed port is connected to the discharge buffer bin, the water inlet is connected to the cooling jacket and is connected to the circulating water pump, the second sealing cover is provided with a discharge port and a water outlet, the water outlet is connected to the cooling jacket.

[0019] Compared with the prior art, the present invention has at least the following advantages:

[0020] The scraper assembly is used to remove the material attached to the inner wall of the smoke exhaust pipe, which solves the problem of blockage of the furnace head smoke exhaust duct of the rotary kiln. The exhaust gas in the smoke exhaust pipe then enters the smoke dust settling chamber. Due to the sudden expansion of the space in the smoke dust settling chamber, most of the dust in the exhaust gas will reduce the drift speed and collide with each other to form agglomerates. Under the action of gravity, they are deposited at the bottom of the smoke dust settling chamber and then enter the discharge buffer bin, which improves the recovery rate of coke powder in the exhaust gas. A fan is set at the outlet of the smoke dust settling chamber to extract the exhaust gas in the smoke dust settling chamber. Under the action of pressure difference, the exhaust gas can enter the smoke dust settling chamber faster. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1Schematic diagram of the exhaust gas and dust recovery system from the rotary kiln pre-carbonization of negative electrode materials.

[0022] Figure 2 This is a schematic diagram of the structure of the material barrel in the exhaust gas and dust recovery system of the rotary kiln pre-carbonized negative electrode material.

[0023] Figure 3 Schematic diagram of the water pipe layout of the second cooling water jacket.

[0024] In the figure: a rotary kiln burner 10, a smoke exhaust pipe 20, a discharge buffer bin 30, a star-shaped discharger 310, a material circulation pipe 311, a first spiral pusher 312, a second spiral pusher 313, a drum cooler 40, a cooling mechanism 410, a circulating water pump 411, a cooling coil 412, a cooling jacket 413, a first sealing cover 416, a second sealing cover 417, a drum drive device 418, a scraper assembly 50, a drive motor 510, a connecting rod 520, a scraper 530, a smoke settling chamber 60, a dust recovery pipe 610, a partition 620, a Roots blower 70, a tar catcher 80, a buffer tank 90, and a water seal tank 100. DETAILED DESCRIPTION

[0025] It should be noted that, in the absence of conflict, the embodiments and features of the embodiments of the present invention can be combined with each other. The following will further describe the technical solution of the present invention in conjunction with the drawings of the embodiments of the present invention, and the present invention is not limited to the following specific implementation methods.

[0026] It should be understood that the same or similar reference numerals in the drawings of the embodiments correspond to the same or similar components. In the description of the present invention, it should be understood that if there are terms such as "upper", "lower", "front", "back", "left", "right", "top", "bottom", etc. indicating an orientation or positional relationship, they are based on the orientation or positional relationship shown in the drawings. This is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, the terms describing the positional relationship in the drawings are only used for illustrative purposes and cannot be understood as limiting this patent. For those of ordinary skill in the art, the specific meanings of the above terms can be understood according to the specific circumstances.

[0027] Please see Figures 1 to 3A system for recycling tail gas and dust from pre-carbonized negative electrode materials in a rotary kiln comprises a rotary kiln head 10 for recycling dust and utilizing tail gas, a smoke exhaust pipe 20, a scraper assembly 50, a smoke dust settling chamber 60, and a tar catcher 80, a buffer tank 90, a roots blower 70 and a water seal tank 100 connected in sequence, and also comprises a discharge buffer bin 30 and a drum cooler 40 for recycling sensible heat of materials and rapidly cooling materials. The smoke exhaust pipe 20 extends to the smoke dust settling chamber 60. The smoke settling chamber 60 is sealed with the smoke exhaust pipe 20, and the scraper assembly 50 is arranged in the smoke exhaust pipe 20. The scraper assembly 50 is in contact with the inner wall of the smoke exhaust pipe 20 and can rotate in the smoke exhaust pipe 20; a dust recovery pipe 610 is provided at the bottom of the smoke settling chamber 60, and the dust recovery pipe 610 is connected to the discharge buffer bin 30, and the tar collector 80 is connected to the smoke settling chamber 60.

[0028] The exhaust pipe 20 is arranged at the exhaust gas outlet of the rotary kiln furnace head 10. When the exhaust pipe 20 is arranged, it can be arranged vertically or inclined. The scraper assembly 50 is arranged in the exhaust pipe 20 to remove the tar and raw material coke powder adhering to the inner wall of the exhaust pipe 20 (the source of tar and raw material coke powder: the exhaust gas generated in the rotary kiln furnace head 10 is discharged from the exhaust pipe 20, and the tar and raw material coke powder mixed in the exhaust gas, when the exhaust gas contacts the inner wall of the exhaust pipe 20, condenses on the inner wall of the exhaust pipe 20 when it is cold, and slowly blocks the exhaust pipe 20). At this time, in order to scrape off the coke powder on the inner wall of the exhaust pipe 20, the scraper assembly 50 is arranged. The scraper assembly 50 is in contact with the inner wall of the smoke exhaust pipe 20. When the scraper assembly 50 rotates, the scraper assembly 50 scrapes off the condensed tar and raw coke powder on the inner wall of the smoke exhaust pipe 20; the scraper assembly 50 rotates in the smoke exhaust pipe 20 to remove the tar and raw coke powder on the inner wall of the smoke exhaust pipe 20, so as to avoid the tar and raw coke powder condensed on the inner wall of the smoke exhaust pipe 20 from clogging the smoke exhaust pipe 20 when it is cold, and under the action of the scraper assembly 50, large particles of tar and raw coke powder will fall back into the furnace head of the rotary kiln under the action of gravity, and smaller particles of tar and raw coke powder will enter the smoke dust settling chamber 60 under the action of the rising exhaust gas.

[0029] At the same time, the tar and raw coke powder that have not condensed on the inner wall of the smoke exhaust pipe 20 will be carried by the exhaust gas and pass through the smoke exhaust channel formed between the scraper assembly 50 and the smoke exhaust pipe 20 to enter the smoke dust settling chamber 60. At this time, since the internal cavity of the smoke dust settling chamber 60 is larger than the internal cavity of the smoke exhaust pipe 20, the exhaust gas instantly enters a larger cavity. At this time, most of the raw coke powder will reduce the drift speed, and the fine raw coke powder will collide with each other and agglomerate. Under the action of gravity, it will gradually settle at the bottom of the smoke dust settling chamber 60, and then flow into the discharge buffer bin 30 through the dust recovery pipe 610, realizing the direct recovery of the raw coke powder in the exhaust gas, avoiding the raw coke powder from entering the air, and improving the recovery of the raw coke powder.

[0030] After passing through the smoke settling chamber 60, the remaining small amount of tar and raw coke fine powder enters the tar catcher 80, is captured and falls into the tar pool, thereby realizing the recovery of tar in the tail gas, and the tail gas after removing the tar and raw coke fine powder enters the buffer tank 90. When using the buffer tank 90 (a pressure sensor can be set on the buffer tank 90), the pressure sensor on the buffer tank 90 detects the furnace pressure setting value, for example, 1000-2000Pa, the Roots blower 70 will be started through the controller, and the tail gas will pass through the water seal tank 100 and finally be sent to the combustion chamber for combustion through the check valve, becoming an auxiliary energy source for heating the converter roasting section.

[0031] At the same time, in the present solution, the tail gas generated by the rotary kiln furnace head 10 and the treatment of the tail gas are carried out synchronously. Once the furnace is stopped, the furnace pressure in the rotary kiln furnace head 10 will decrease, and the Roots blower 70 will also stop rotating. The communicating vessels in the entire system will be in a closed constant pressure state. Since there is no large amount of tail gas storage, the leakage of tail gas or the entry of outside air is prevented. In addition, with the support of multiple technical means such as nitrogen protection, automatic emptying valve, and explosion-proof valve, the purpose of safe recovery and utilization of the tail gas from the rotary kiln furnace head 10 is achieved.

[0032] Specifically, the scraper assembly 50 includes a drive motor 510, a connecting rod 520 and a scraper 530. The drive motor 510 is arranged outside the smoke settling chamber 60. The drive motor 510 is connected to the connecting rod 520, passes through the smoke settling chamber 60 and extends into the smoke exhaust pipe 20. The scraper 530 is sleeved on the connecting rod 520, and the scraper 530 is in contact with the inner wall of the smoke exhaust pipe 20.

[0033] Specifically, during installation, the drive motor 510 is disposed on the outer wall of the smoke settling chamber 60 and fixedly installed, and is located directly above the smoke exhaust pipe 20 .

[0034] Specifically, the two ends of the connecting rod 520 are respectively connected to the scraper 530 and the drive motor 510. When the drive motor 510 is working, it drives the connecting rod 520 to rotate, and then drives the scraper 530 to rotate in the smoke exhaust pipe 20. During the rotation of the scraper 530, since the end of the scraper 530 contacts the inner wall of the smoke exhaust pipe 20, the tar and raw coke powder condensed on the inner wall of the smoke exhaust pipe 20 are scraped off when the scraper 530 rotates. In addition, when the scraper 530 is rotating, the tar and raw coke powder are not easy to adhere to the surface of the scraper 530, and the scraper 530 will not block the smoke exhaust pipe 20.

[0035] Specifically, the diameter and length of the connecting rod 520 are reasonably set according to the inner diameter of the exhaust pipe 20. There are four groups of scrapers 530, all of which are vertically arranged in the exhaust pipe 20. The angles between adjacent scrapers 530 are evenly set at 90°. The cavity formed between the two groups of scrapers 530 is the exhaust gas flow cavity, which is divided into 4 groups of flow cavities.

[0036] To further improve the performance, the scraper assembly 50 further includes a sleeve and a mounting plate. The sleeve is detachably mounted on the connecting rod 520, and the mounting plate is mounted on the sleeve. The scraper is detachably connected to the mounting plate. The scraper 530 can rotate within the exhaust pipe 20 when in use. In this embodiment, a rotational method is used as an example: the sleeve is mounted on the connecting rod 520. When the connecting rod 520 rotates, the sleeve is driven to rotate, and then the mounting plate connected to the sleeve also rotates, which in turn drives the scraper 530 to rotate, thereby removing the tar and raw coke powder adhering to the surface of the exhaust pipe 20, thereby preventing the exhaust pipe 20 from being blocked.

[0037] Specifically, a mounting hole is provided on the mounting plate, and a positioning hole corresponding to the mounting hole is provided on the scraper 530. The scraper 530 is fixed to the mounting plate using bolts and nuts. When the diameter of the smoke exhaust pipe 20 becomes larger, a wider scraper 530 is installed; conversely, when the diameter of the smoke exhaust pipe 20 becomes smaller, a narrower scraper 530 can be installed, thereby improving the applicability of the scraper assembly 50.

[0038] Furthermore, a plurality of baffles 620 are evenly spaced at predetermined intervals within the smoke settling chamber 60, with adjacent baffles 620 being staggered to form a transverse S-shaped channel. Tar and raw coke fines enter the smoke settling chamber 60 through the gap between the scraper 530 and the smoke exhaust pipe 20. Due to the sudden expansion of the space, the vast majority of the tar and raw coke fines slow down their drift speed. Under the obstruction of the baffles 620, they collide with each other and form agglomerates. Under the action of gravity, they gradually settle to the bottom of the smoke settling chamber 60 and then flow into the discharge buffer bin 30 along the dust recovery pipe 610. During the setup, nitrogen can be used for timed purge assistance, allowing the dust to flow into the discharge buffer bin 30 along the bottom dust recovery pipe 610. Thus, the recovery of raw coke fine powder in the tail gas is achieved. At the same time, the smoke dust settling chamber 60 is configured to be funnel-shaped, that is, the bottom of the smoke dust settling chamber 60 is inclined, which can better allow tar and raw coke fine powder to enter the dust recovery pipe 610.

[0039] Specifically, in order to make the tar and raw coke powder better flow back into the discharge buffer bin 30, a first spiral pusher 312 is provided in the dust recovery pipe 610. During the rotation, the first spiral pusher 312 moves the tar and raw coke powder in the dust recovery pipe 610 into the discharge buffer bin 30. When setting, a motor is provided on the outer wall of the dust recovery pipe 610. The motor drives the first spiral pusher 312 to rotate, and a seal (sealing gasket) is provided at the connection between the motor and the dust recovery pipe 610 to prevent air from passing through the dust recovery pipe 610, the discharge buffer bin 30 and the smoke dust settling chamber 60, and at the same time, prevent the raw coke powder from escaping from the connection.

[0040] Please see Figure 1 The outlet of the discharge buffer bin 30 is provided with a star-shaped discharger 310 , and the star-shaped discharger 310 is connected to the drum cooler 40 through a material flow pipe 311 .

[0041] The star-shaped discharger 310 is commonly used in pneumatic output systems. For pressure output systems or negative pressure output systems, the star-shaped discharger 310 can evenly and continuously feed the drum cooler 40 through the material flow pipe 311 to ensure that the gas and solid in the pneumatic output pipe are relatively stable, thereby enabling the normal operation of the pneumatic conveying. At the same time, it can also isolate the air pressure at the upper and lower parts of the star-shaped discharger 310, thereby locking the material and air. When in use, when the material in the upper discharge buffer bin 30 falls by its own weight and fills the cavity between the two blades, the blades rotate 180° from top to bottom under the action of external force, and finally discharge the material at the bottom and send the material into the material flow pipe 311. This achieves quantitative and continuous discharge, allowing the material to enter the drum cooler 40 evenly. In addition, the star-shaped discharger 310 is provided at the outlet of the discharge buffer bin 30. Since the bottom of the discharge buffer bin 30 and the star-shaped discharger 310 are filled with materials, the air in the material flow pipe 311 cannot flow back into the discharge buffer bin 30. The star-shaped discharger 310 can play a sealing role to prevent air from entering the discharge buffer bin 30 and the rotary kiln furnace head 10.

[0042] Furthermore, a second screw pusher 313 is provided in the material flow pipe 311. The structure of the second screw pusher 313 is the same as that of the first screw pusher 312. The second screw pusher 313 mainly rotates and pushes the material in the material flow pipe 311 into the drum cooler 40 to prevent the material from accumulating in the material flow pipe 311 and causing blockage.

[0043] Furthermore, it also includes a cooling mechanism 410, which includes a circulating water pump 411, a cooling coil 412 and a cooling jacket 413. The cooling coil 412 is arranged in the discharge buffer bin 30 and is attached to the inner wall of the discharge buffer bin 30. The cooling jacket 413 is arranged on the drum cooler 40 and is attached to the outer wall of the drum cooler 40. The materials entering the discharge buffer bin 30 and the materials in the drum cooler 40 have a high temperature due to the calcination of the rotary kiln furnace head 10. In order to achieve energy saving and environmental protection, part of the water in the circulating water pump 411 is passed into the cooling coil 412. Since the temperature of the material in the discharge buffer bin 30 is extremely high, after contacting the cooling coil 412, heat exchange is achieved with the cooling water in the cooling coil 412, which forms a preliminary cooling for the extremely high temperature material. The temperature of the cooling water in the cooling coil 412 rises rapidly, and the temperature of the cooling water in the cooling coil 412 rises rapidly. High-temperature water and hot steam are formed at the outlet of the cooling coil 412, and the high-temperature water and hot steam are recycled; part of the water in the circulating water pump 411 is passed into the cooling jacket 413, and since the material in the drum cooler 40 is initially cooled by the cooling coil 412, the temperature is reduced. As the drum cooler 40 rotates, the material in the drum cooler 40 and the cooling water in the cooling jacket 413 undergo a secondary heat exchange, further reducing the material temperature. At the same time, the cooling water after heat exchange is recycled.

[0044] For further information, see Figure 2 and Figure 3 The drum cooler 40 also includes a first sealing cover 416 and a second sealing cover 417. The first sealing cover 416 and the second sealing cover 417 are symmetrically arranged at both ends of the drum cooler 40 and are sealed. The drum cooler 40 can rotate between the first sealing cover 416 and the second sealing cover 417. The first sealing cover 416 is provided with a feed port and a water inlet. The feed port is connected to the discharge buffer bin 30, and the water inlet is connected to the cooling jacket 413 and the circulating water pump. The second sealing cover 417 is provided with a discharge port and a water outlet. The water outlet is connected to the cooling jacket 413.

[0045] Cooling water: When setting the cooling water inlet, the cooling water pipe passes through the first sealing cover 416 from the water inlet set on the first sealing cover 416. The water inlet is set at the center of the first sealing cover 416 and is concentric with the cooling water pipe. A rotating sealing port is set at the connection between the water inlet and the sealed cavity formed between the first sealing cover 416 and the roller cooler 40. The cooling water pipe first passes through the water inlet and then passes through the rotating sealing port. After that, the outlet end of the rotating sealing port is arranged in a cross shape and is connected to the second cooling water jacket 413. At this time, the cooling water pipe and the second cooling water jacket 413 are in a sealed state and are not connected to the roller cooler 40, so as to prevent the cooling water from wetting the raw coke powder. In use, the second cooling water jacket 413 can rotate with the roller cooler 40 under the action of the rotating sealing port when in use; at the same time, when setting the cooling water outlet, the setting of the cooling water outlet end is the same as the cooling water inlet end.

[0046] Material: The raw coke powder enters the material inlet from the outlet of the star-shaped discharger 310, and enters the sealed cavity. When setting the material inlet, the material inlet can be set directly above the water inlet. After the raw coke powder enters the sealed cavity, it will gradually accumulate at the bottom of the sealed cavity under the action of gravity. As the drum cooler 40 rotates, the raw coke powder is moved from the feed port to the discharge port with the assistance of the stirring blades inside the drum cooler 40, and the discharge port is set directly below the water outlet. At this time, the material flows out from the material outlet and enters the corresponding collection equipment, avoiding interference between the raw coke powder and the cooling water pipe when entering and flowing out of the drum cooler 40 for cooling.

[0047] At the same time, the drum cooler 40 rotates relative to the first sealing cover 416 and the second sealing cover 417. In other words, the drum cooler 40 rotates, while the first sealing cover 416 and the second sealing cover 417 do not rotate. In order to ensure the sealing of the sealed cavity, seals (similar to bearings) are provided at the contact points between the first sealing cover 416 and the second sealing cover 417 and the drum cooler 40, thereby ensuring the sealing of the sealed cavity and ensuring that the drum cooler 40 can rotate during use.

[0048] Specifically, when the second cooling water jacket 413 in the drum-type cooling unit 40 rotates, a drum drive device 418 is provided on the drum-type cooling unit 40. The drum drive device 418 is sleeved on the outer surface of the second cooling water jacket 413 to drive the second cooling water jacket 413 to rotate. The drum drive device 418 includes a first gear, a second gear, and a drive motor. The first gear is sleeved on the outer surface of the second cooling water jacket 413, and the second gear and the first gear are meshed with each other. The drive motor is connected to the second gear. When the drive motor rotates, it drives the second gear to rotate, and the second gear drives the first gear to rotate, thereby achieving the rotation of the second cooling water jacket 413. The second gear is the driving gear, and the first gear is the driven gear.

[0049] Obviously, the above embodiments of the present invention are merely examples for the purpose of clearly illustrating the present invention, and are not intended to limit the implementation methods of the present invention. Those skilled in the art will appreciate that other variations or modifications can be made based on the above description. It is not necessary and impossible to provide an exhaustive list of all implementation methods. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A system for recycling tail gas and dust from pre-carbonized negative electrode materials in a rotary kiln, characterized in that: It includes a rotary kiln head, a smoke exhaust pipe, a scraper assembly, a smoke dust settling chamber for recovering dust and utilizing tail gas, and a tar catcher, a buffer tank, a Roots blower and a water seal tank connected in sequence. It also includes a discharge buffer bin and a drum cooler for recovering and utilizing the sensible heat of materials and quickly cooling materials. The smoke exhaust pipe extends into the smoke dust settling chamber, and the smoke exhaust pipe and the smoke dust settling chamber are sealed. The scraper assembly is arranged in the smoke exhaust pipe, the scraper assembly is in contact with the inner wall of the smoke exhaust pipe, and can rotate in the smoke exhaust pipe; a dust recovery pipe is provided at the bottom of the smoke dust settling chamber, the dust recovery pipe is connected to the discharge buffer bin, and the tar catcher is connected to the smoke dust settling chamber.

2. The system for recycling tail gas and dust from pre-carbonized negative electrode materials in a rotary kiln according to claim 1, characterized in that: The scraper assembly includes a drive motor, a connecting rod and a scraper. The drive motor is arranged outside the smoke settling chamber. The drive motor is connected to the connecting rod, passes through the smoke settling chamber and extends into the smoke exhaust pipe. The scraper is sleeved on the connecting rod and contacts the inner wall of the smoke exhaust pipe.

3. The system for recycling tail gas and dust from pre-carbonized negative electrode materials in a rotary kiln according to claim 2, characterized in that: The scraper assembly further comprises a shaft sleeve and a mounting plate. The shaft sleeve is detachably mounted on the connecting rod. The mounting plate is arranged on the shaft sleeve. The scraper is detachably connected to the mounting plate.

4. The system for recycling tail gas and dust from pre-carbonized negative electrode materials in a rotary kiln according to claim 1, characterized in that: A plurality of partitions are evenly arranged at a preset distance in the smoke settling chamber, and adjacent partitions are staggered in sequence to form a transverse S-shaped channel.

5. The system for recycling tail gas and dust from pre-carbonized negative electrode materials in a rotary kiln according to claim 1, characterized in that: A first spiral pusher is provided in the dust recovery pipe.

6. The system for recycling tail gas and dust from pre-carbonized negative electrode materials in a rotary kiln according to claim 1, characterized in that: The outlet of the discharge buffer bin is provided with a star-shaped discharger, and the star-shaped discharger is communicated with the drum cooler through a material flow pipe.

7. The system for recycling tail gas and dust from pre-carbonized negative electrode materials in a rotary kiln according to claim 6, wherein a second spiral pusher is provided in the material flow pipe.

8. The system for recycling tail gas and dust from pre-carbonized negative electrode materials in a rotary kiln according to claim 1, characterized in that: It also includes a cooling mechanism, which includes a circulating water pump, a cooling coil and a cooling jacket. The cooling coil is arranged in the discharge buffer bin and is attached to the inner wall of the discharge buffer bin. The cooling jacket is arranged on the drum cooler and is attached to the outer wall of the drum cooler.

9. The system for recycling tail gas and dust from pre-carbonized negative electrode materials in a rotary kiln according to claim 8, characterized in that: The drum cooler also includes a first sealing cover and a second sealing cover, which are symmetrically arranged at both ends of the drum cooler and sealed, and the drum cooler can rotate between the first sealing cover and the second sealing cover. The first sealing cover is provided with a feed port and a water inlet, the feed port is communicated with the discharge buffer bin, the water inlet is communicated with the cooling jacket and the circulating water pump, and the second sealing cover is provided with a discharge port and a water outlet, and the water outlet is communicated with the cooling jacket.

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