Lithium battery negative electrode material pre-carbonization system

Abstract

The utility model discloses a lithium battery cathode material pre-carbonization system which comprises a rotary heater, a cooling kiln and a combustion furnace, an air inlet cover and an air outlet cover are arranged outside the rotary heater, a plurality of material channels are arranged in the rotary heater, and a high-temperature heating channel communicated with the air inlet cover and the air outlet cover is arranged on the periphery of each material channel. The smoke exhaust end of the combustion furnace is communicated with the air inlet cover; a gas channel structure is arranged between the gas inlet cover and the rotary heater; and after the gas medium in the gas outlet pipeline is cooled, one path of the gas medium enters the combustion furnace, and the other path of the gas medium enters the gas channel structure. According to the utility model, the temperature rise in the material channel is stable and uniform, the thickness of a material layer is reduced, and the temperature uniformity of materials with poor heat transfer rate is better. And direct contact between the air inlet cover and the rotary heater is avoided, the thermal deformation probability of the air inlet of the kiln body is reduced, and meanwhile, the possibility that an internal heat-preservation refractory material falls off is also reduced.

Description

TECHNICAL FIELD

[0001] The utility model belongs to lithium battery negative pole production technical field, concretely relates to a lithium battery negative pole material pre-carbonization system. BACKGROUND

[0002] Pre-carbonization is an important production process in the production process of lithium battery negative pole material (artificial graphite), and the purpose is to improve the efficiency of subsequent graphitization process, save production cost and improve the environment. At present, the industry adopts tunnel kiln and external heating type rotary heater to solve this production process. In the actual production process, both methods have certain disadvantages.

[0003] 1. The advantage of the tunnel kiln is that the working temperature can be relatively high (the inner lining is made of refractory material), the residence time can be long, the product quality is relatively stable, and the failure rate is low. The disadvantage is that the production cost is high, the waste heat cannot be fully utilized, the product needs to be packed and shipped with a box, the box is both a consumable and an energy loss carrier, the production needs to be loaded and unloaded, the continuous production is not proper, the amount of exhaust gas is large, the composition of the exhaust gas is complex, and the environmental protection requirement is high. At the same time, the disadvantages are large occupation area and the like.

[0004] 2. The traditional external heating type rotary heater utilizes the metal cylinder external heating mode, the material is continuously produced, the box loading is avoided, the cylinder is heated by utilizing the volatilization of the material, the production cost is low, the environmental protection is improved, and the occupation area is small. However, due to the high temperature performance of the metal material, the working temperature is limited in this structure, the material runs unevenly, the heating is uneven, the product quality is poor, the graphitization production is seriously affected, and at the same time, when the tar gas of the volatilization is separated from the material during pre-carbonization, the temperature drop easily causes the tar gas to be liquefied to cause pipe blockage. In the production process, the failure rate is high, and the production continuity is not strong. UTILITY MODEL CONTENTS

[0005] In view of the above technical problems, the purpose of the utility model is to provide a lithium battery negative pole material pre-carbonization system which can uniformly and stably heat the material and utilize the waste heat.

[0006] In order to achieve the above purpose, the utility model provides the following technical scheme:

[0007] The lithium battery negative pole material pre-carbonization system comprises a feeding mechanism, a rotary heater, a cooling kiln and a combustion furnace. The discharge end of the feeding mechanism is communicated with the feeding end of the rotary heater, and is used for feeding the negative pole material into the rotary heater. The material discharge end of the rotary heater is communicated with the entering end of the cooling kiln, and is used for feeding the carbonized material in the rotary heater into the cooling kiln. The flue gas discharge end of the combustion furnace is communicated with the high-temperature heating channel in the rotary heater,

[0008] The rotary heater is externally provided with an air inlet cover and an air outlet cover, and is internally provided with a plurality of material channels, each of which is externally provided with a high-temperature heating channel in communication with the air inlet cover and the air outlet cover, and the flue gas discharge end of the combustion furnace is in communication with the air inlet cover; a gas channel structure is arranged between the air inlet cover and the rotary heater;

[0009] The air outlet cover is communicated with an air outlet pipeline for discharging the gas medium in the high-temperature heating channel from the air outlet cover, and the gas medium in the air outlet pipeline is cooled and then enters the combustion furnace or the gas channel structure.

[0010] As a further embodiment, the feeding end of the rotary heater is provided with a material distribution cavity, and each material channel in the material distribution cavity is provided with a material distributor at the end thereof, and the material distributor guides the material in the material distribution cavity into the corresponding material channel; the material distributor is an inclined material receiving groove arranged at the end of the material channel.

[0011] As a further embodiment, the rotary heater is assembled by a segmented heater body, and an intermediate connecting section is arranged between the segmented heater bodies, the intermediate connecting section comprises an intermediate connecting shell fixedly connected with the segmented heater body, the intermediate connecting shell is internally provided with a communication channel in communication with the material channel, and a gas communication pipeline in communication with the high-temperature heating channels between the segmented heater bodies;

[0012] A corrugated expansion structure is arranged in the communication channel; the gas communication pipeline comprises a first communication pipe, a second communication pipe and a bellows pipe, the first communication pipe and the second communication pipe are respectively in communication with the heating channels in the segmented heater body, and the bellows pipe is in communication between the first communication pipe and the second communication pipe.

[0013] As a further embodiment, the gas channel structure comprises a first isolation component spacing the air inlet cover and the peripheral wall of the rotary heater;

[0014] The first isolation component is internally provided with an axial channel and a radial channel in communication with the axial channel, the axial channel is arranged axially along the peripheral wall of the rotary heater, the axial channel is between the air inlet cover and the peripheral wall of the rotary heater, and the radial channel is on the outer side of the air inlet cover; the first isolation component is provided with an air vent in communication with the radial channel, the air vent is in communication with the above-mentioned air outlet pipeline, and the axial channel is in communication with the air inlet cover.

[0015] As a further embodiment, the gas channel structure further comprises a second isolation component covering the peripheral wall of the rotary heater, the second isolation component is on the inner side of the first isolation component, a rotating sealing fit is formed between the inner side of the first isolation component and the second isolation component, and an annular spacing channel is formed between the inner wall of the second isolation component and the peripheral wall of the rotary heater;

[0016] The rotary heater is provided with an air inlet pipe assembly in communication with the spacing channel, the air inlet pipe assembly is rotationally connected to a rotary support part at the end of the rotary heater, and a first rotary joint is arranged on the rotary support part and connected to the air inlet pipe assembly.

[0017] In a further embodiment, the cooling kiln has a hot material inlet in communication with the material discharge end of the rotary heater, and a cooling material outlet. A cooling material channel is formed in the cooling kiln in communication with the hot material inlet and the cooling material outlet. A first heat recovery pipe group and a second heat recovery pipe group are arranged along the length of the cooling kiln. The first heat recovery pipe group is arranged near the hot material inlet, and the second heat recovery pipe group is arranged near the cooling material outlet. Heat exchange gas is introduced into the first heat recovery pipe group, and heat exchange water is introduced into the second heat recovery pipe group.

[0018] In a further embodiment, the first heat recovery pipe group includes at least a first heat recovery gas pipe arranged on the inner wall of the cooling kiln. The first heat recovery gas pipe extends from the hot material inlet towards the inner wall of the middle part of the cooling kiln and forms a first heat recovery gas pipe layer on the inner wall of the cooling kiln. The two ends of the first heat recovery gas pipe extend to the outside of the cooling kiln, one end serving as a gas inlet end, and the other end serving as a gas outlet end.

[0019] In a further embodiment, the second heat recovery pipe group includes a water distribution chamber, a water collection chamber, a second rotary joint, and a heat recovery water pipe group. The second rotary joint is arranged at the end of the cooling kiln near the cooling material outlet. The second rotary joint includes a water inlet channel and a water outlet channel. The water distribution chamber is in communication with the water inlet pipe, and the water collection chamber is in communication with the water outlet channel. The heat recovery water pipe group is connected between the water collection chamber and the water distribution chamber and extends from the cooling material outlet towards the inner wall of the middle part of the cooling kiln.

[0020] In a further embodiment, the volatile discharge end of the rotary heater is provided with a separation treatment device. The separation treatment device includes an indirect heat exchange device, a cooling device, and a gas-solid separation device.

[0021] The volatile discharge end is connected to the indirect heat exchange device, the indirect heat exchange device is connected to the cooling device, the cooling device is connected to the inlet end of the gas-solid separation device, the gas discharge end of the gas-solid separation device is connected to the gas inlet end of the combustion furnace, and the solid discharge end of the gas-solid separation device is connected to the material discharge end of the rotary heater.

[0022] The high-temperature flue gas generated by the combustion furnace provides heat source for the indirect heat exchange device, so that the volatiles passing through the indirect heat exchange device are cracked at a temperature of 1100-1200℃. The gas-solid mixture after the cracking of the volatile tar in the cooling device is cooled to a low temperature gas-solid separation temperature of 120-160℃ and then enters the gas-solid separation device.

[0023] Compared with the prior art, the utility model discloses at least the following beneficial effects are:

[0024] 1、 by adopting multiple material channels and the heating channel that sets up outside each material channel, can make the material temperature in each material channel more uniform, compared with the traditional kiln of same diameter, the heat exchange area increases accordingly, and the diameter of material channel reduces little, and the material temperature in material channel is more uniform, and the material layer thickness also becomes small, and the material temperature uniformity of the heat transfer rate difference is better, especially in the heating process, the material that requires low temperature deviation, highlights its superiority, because the heat transfer rate is relatively improved, can make up the production capacity disadvantage through improving kiln body rotation speed, improving the installation inclination of equipment.

[0025] 2、 by adopting gas channel structure, direct contact between gas inlet cover and rotary heater can be avoided, and the heat diffusion capacity of gas inlet cover itself towards the kiln body direction is reduced, thereby the temperature at the gas inlet of rotary heater is reduced, the requirement of rotary heater material can be reduced, and the hot deformation probability at the gas inlet of kiln body can be reduced, and the possibility of internal heat preservation refractory material falling off is also reduced.

[0026] 3、 the gas exhausted from the high-temperature heating channel of rotary heater is utilized for heat, one way enters the combustion furnace and is arranged, and one way enters the gas channel structure and is used as isolation protection gas. BRIEF DESCRIPTION OF DRAWINGS

[0027] Figure 1 It is the system schematic diagram of the utility model;

[0028] Figure 2 It is the internal structure schematic of rotary heater in the utility model Figure 1 ;

[0029] Figure 3 It is the internal structure schematic of rotary heater in the utility model Figure 2 ;

[0030] Figure 4 It is the structure schematic at rotary heater and gas inlet cover in the utility model;

[0031] Figure 5 It is the external structure schematic of cooling kiln in the utility model;

[0032] Figure 6 It is the internal structure schematic of cooling kiln in the utility model;

[0033] Figure 7 It is the cross section structure schematic of first heat recovery pipe group in the utility model;

[0034] Figure 8 It is the cross section structure schematic view of second heat recovery pipe group in the utility model;

[0035] Figure 9 It is Figure 6 The enlarged schematic view of A part in the utility model;

[0036] Figure 10 It is Figure 6 The enlarged schematic view of B part in the utility model;

[0037] Figure 11 It is the separation processing device schematic view of volatile matter of rotary heater in the utility model;

[0038] The mark in the drawing represents as follows:

[0039] 10, feeding mechanism, 11, rotary heater, 12, cooling kiln, 13, combustion furnace, 14, feeding bin, 15, buffer bin, 16, metering rotary valve, 17, high-temperature heating channel, 18, air inlet cover, 19, air outlet cover;

[0040] 20, material channel, 21, cloth chamber, 22, cloth distributor, 23, intermediate connecting section, 24, intermediate connecting shell, 25, communication channel, 26, corrugated expansion structure, 27, first communication pipe, 28, second communication pipe, 29, wave tube;

[0041] 30, air outlet pipeline, 31, first isolation component, 32, axial channel, 33, radial channel, 34, air vent, 35, high-temperature air inlet channel, 36, communication hole, 37, second isolation component, 38, sealing ring, 39, rotary sealing piece;

[0042] 40, interval channel, 41, air inlet pipeline assembly, 42, rotary support component, 43, first rotary joint, 44, waste heat utilization device, 45, gas purification device, 46, pressure fan, 47, hot material inlet, 48, cold material outlet, 49, cooling material channel;

[0043] 50, first heat recovery gas pipeline, 51, second heat recovery gas pipeline, 52, water separation chamber, 53, water collection chamber, 54, second rotary joint, 55, heat recovery water pipe group, 56, water inlet channel, 57, water outlet channel, 58, outer sealing plate, 59, inner sealing plate;

[0044] 60, rear cylinder, 61, pipe body, 62, heat recovery water pipeline, 63, baffle, 64, connecting rod, 65, air inlet expansion joint, 66, volatile matter discharge end, 67, indirect heat exchange device, 68, cooling device, 69, gas-solid separation device;

[0045] 70, air blower, 71, first pipe, 72, second pipe, 73, exhaust gas discharge pipe, 74, heat exchanger. DETAILED DESCRIPTION

[0046] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application.

[0047] Please refer to Figure 1 As shown in the figure, the lithium battery negative electrode material pre-carbonization system comprises a feeding mechanism 10, a rotary heater 11, a cooling kiln 12, and a combustion furnace 13. The discharge end of the feeding mechanism 10 is in communication with the feed end of the rotary heater 11, and is used to send the negative electrode material into the rotary heater 11 for pre-carbonization treatment. The feeding mechanism 10 comprises a feeding bin 14, a buffer bin 15, and a metering rotary valve 16. The feeding bin 14 is used to receive incoming materials. The top of the buffer bin 15 is connected with the bottom of the feeding bin 14, and the bottom of the buffer bin 15 is connected with the metering rotary valve 16. The materials enter the rotary heater 11 after passing through the metering rotary valve 16. The metering rotary valve can meter the materials entering the rotary heater 11 to obtain accurate feed amount. The material discharge end of the rotary heater 11 is in communication with the entering end of the cooling kiln 12, so that the carbonized materials in the rotary heater 11 enter the cooling kiln 12. The negative electrode material after high-temperature treatment in the rotary heater 11 has a high temperature, and thus needs to enter the cooling kiln 12 for cooling. The flue gas discharge end of the combustion furnace 13 is in communication with the high-temperature heating channel in the rotary heater 11, that is, the combustion products of the combustion furnace 13 are introduced into the high-temperature heating channel 17 to provide heat source for temperature rise of the negative electrode materials in the rotary heater 11.

[0048] Please refer to Figure 2 , 3As shown, the rotary heater 11 is a circular body in cross section, the material passage is circular in cross section, and the high-temperature heating passage 17 is annular in cross section. The rotary heater 11 can rotate under external driving. An air inlet cover 18 and an air outlet cover 19 are arranged outside the rotary heater 11. The rotary heater 11 can be formed by the structure of an existing rotary kiln, and the air inlet cover 18 and the air outlet cover 19 are arranged by the cover structure in the rotary kiln. The rotary heater 11 is provided with a plurality of material passages 20. The high-temperature heating passage 17 is arranged outside each material passage 20 and is in communication with the air inlet cover 18 and the air outlet cover 19. The flue gas discharge end of the combustion furnace 13 is in communication with the air inlet cover 18, and the high-temperature flue gas discharged from the combustion furnace 13 is sent into the high-temperature heating passage 17 through the air inlet cover 18. The plurality of material passages 20 are arranged along the axial direction of the rotary heater 11. Each material passage 20 is in communication between the feeding end and the discharging end of the rotary heater 11, that is, the material at the feeding end can enter the plurality of material passages 20 and be discharged from the discharging end. By arranging the plurality of material passages 20 and the high-temperature heating passage 17 outside each material passage 20, the material is conveyed from the feeding end to the discharging end in the rotary heater 11, and heat transfer is formed in each material passage 20 through the high-temperature heating passage 17, so that the material in the material passage 20 is heated. By arranging the plurality of material passages 20, the problem of uneven heating of the material in a single material passage 20 is avoided. The heat exchange area between the high-temperature heating passage 17 and the material in the material passage 20 is increased, and the heat transfer capacity is also improved, so that the temperature of the material in each material passage 20 is more uniform. Compared with a conventional kiln of the same diameter, the heat exchange area is increased, the diameter of the material passage 20 is reduced, the temperature of the material in the material passage 20 is more uniform, the thickness of the material layer is also reduced, the material temperature uniformity is better for materials with poor heat transfer rate, and the superiority is highlighted for materials that require low temperature deviation during heating. Since the heat transfer rate is relatively improved, the production capacity disadvantage can be compensated by increasing the rotation speed of the rotary heater 11 and the installation inclination of the equipment.

[0049] The structure design of the multi-material channel 20 and the multi-high-temperature heating channel 17 makes the whole outer periphery of the rotary heater 11 not all the heated surfaces (compared to the high-temperature flue gas channel surrounding the outer periphery of the traditional rotary heater 11, the annular cross section of the high-temperature flue gas channel is a stress point), and changes the stress structure between the material channel 20 and the heating channel (i.e. a part of a single heating channel is close to the outer periphery of the rotary heater 11, and a part is inside the rotary heater 11, and the high-temperature heating channel 17 is only the part close to the outer periphery of the rotary heater 11 as a stress point), reduces the waste caused by the heat diffusion outside through the outer periphery of the rotary heater 11, and greatly improves the working temperature of the rotary heater 11. At the same time, due to the change of the stress structure, non-metallic materials can be used as the forming components of the material channel 20, and the forming components can be made of silicon carbide, graphite, carbon-carbon plate, ceramic tube, etc. Using non-metallic materials, the working temperature can be higher, and generally using all-metal materials, even if high-temperature alloy is used, the maximum temperature is ≤1000°C; under the condition of the same material, the working temperature can be improved by 100-150°C. Since most of the heat exchange surfaces between the channels are not subjected to external force, and the support points of the rotary heater 11 can be distributed, the material thickness is also greatly reduced, the cost of the rotary heater 11 is reduced, and the service life of the rotary heater 11 is improved.

[0050] Wherein, the inlet cover 18 and the outlet cover 19 are relatively fixedly arranged outside the rotary heater 11, that is, the rotary heater 11 rotates, and the inlet cover 18 and the outlet cover 19 do not rotate, and the rotary heater 11 and the inlet cover 18 and the outlet cover 19 are sealed by a rotary sealing structure, which is a commonly used technology and will not be described in detail here; in addition, an auxiliary electric heater can be arranged in the high-temperature heating channel 17. The auxiliary electric heater can be used together with the high-temperature flue gas as described above to improve the temperature in the high-temperature heating channel 17, or can be used alone to heat and warm the high-temperature heating channel 17. The auxiliary electric heater can be an electric heating wire or an electric heating silicon-carbon rod. A power slip ring is added to the rotary heater 11 to transmit power to the auxiliary electric heater, thereby providing more heating modes for the rotary heater 11. The power slip ring referred to here mainly provides stable power transmission for the auxiliary electric heater when the rotary heater 11 rotates, which is a prior art and will not be described in detail here.

[0051] Wherein, the high-temperature heating channel 17 is arranged in a ring shape along the length direction of the material channel 20 outside the material channel 20, that is, the high-temperature heating channel 17 is uniformly distributed around the outside of the material channel 20, and the high-temperature heating channel 17 can uniformly transfer heat to the material channel 20, so that the material in the material channel 20 is uniformly heated.

[0052] The rotary heater 11 is provided with a material distributing cavity 21 at the feeding end and a discharging cavity at the discharging end. The material distributing cavity 21 is used to receive the material delivered by the feeding mechanism 10, and the discharging cavity is used to receive the material after being heated and then discharged from the rotary heater 11 to the cooling kiln 12. Each material channel 20 is provided with a material distributor 22 at the end of the material distributing cavity 21, which guides the material in the material distributing cavity 21 into the corresponding material channel 20. The material distributor 22 can be a receiving groove arranged at the end of the material channel 20. When the rotary heater 11 rotates, the material in the material distributing cavity 21 can be guided into the material channel 20 by the material distributor 22.

[0053] The rotary heater 11 is assembled by two sectional heater bodies. The number of sections can also be set according to the length of the rotary heater 11. The sectional heater bodies are connected by an intermediate connecting section 23. The intermediate connecting section 23 is fixedly connected to the two sectional heater bodies by flanges. The intermediate connecting section 23 includes an intermediate connecting shell 24 fixedly connected to the sectional heater bodies. The intermediate connecting shell 24 is provided with a communication channel 25 in communication with the material channels 20. The communication channel 25 is used to communicate the material channels 20 on both sides of the intermediate connecting section 23 and the gas communication pipeline of the high-temperature heating channels 17 between the sectional heater bodies, so as to flow the high-temperature flue gas in the high-temperature heating channels 17 on both sides of the intermediate connecting section 23. By arranging the intermediate connecting section 23, the length of the kiln body and the heating and residence time of the material can be satisfied as much as possible. Meanwhile, the problem of transportation difficulty caused by the long rotary heater 11 can be avoided, and the corresponding problems caused by the long kiln body can also be solved.

[0054] In order to eliminate the problem of thermal expansion of the rotary heater 11, a corrugated expansion structure 26 is arranged in the communication channel 25. The inner wall of the communication channel 25 is arranged as a corrugated expansion surface to compensate for the thermal expansion. In addition, the gas communication pipeline includes a first communication pipe 27, a second communication pipe 28, and a wave tube 29. The first communication pipe 27 and the second communication pipe 28 are in communication with the heating channels in the sectional heater bodies, respectively. The wave tube 29 is in communication between the first communication pipe 27 and the second communication pipe 28. The number and inner diameter of the gas communication pipeline are set according to the needs. The gas communication pipeline is mainly used for the high-temperature communication flow in the heating channels. The wave tube 29 can compensate for the problem of thermal expansion.

[0055] A gas channel structure is arranged between the gas inlet cover 18 and the rotary heater 11. The gas outlet cover 19 is provided with a gas outlet pipeline 30 for discharging the gas medium in the high-temperature heating channels 17 from the gas outlet cover 19. The gas medium in the gas outlet pipeline 30 is cooled and then enters the combustion furnace 13 or the gas channel structure, so that the waste heat discharged from the rotary heater 11 can be reused.

[0056] Please refer toFigure 4 As shown, the gas passage structure comprises a first isolation component 31 which separates the gas inlet cover 18 from the outer peripheral wall of the rotary heater 11, and the first isolation component 31 forms a rotating seal with the outer peripheral wall of the rotary heater 11. The first isolation component 31 is provided with an axial passage 32 and a radial passage 33 which communicates with the axial passage 32, the axial passage 32 is arranged axially along the outer peripheral wall of the rotary heater 11, and the axial passage 32 is between the gas inlet cover 18 and the outer peripheral wall of the rotary heater 11, so that the heat transfer capacity between the gas inlet cover 18 and the rotary heater 11 can be blocked through the axial passage 32; the radial passage 33 is outside the gas inlet cover 18, and the heat on the side of the gas inlet cover 18 can be isolated through the radial passage 33, so that the heat diffusion of the gas inlet cover 18 to the side is reduced.

[0057] The first isolation component 31 is provided with an air vent 34 which communicates with the radial passage 33 on both sides, and the air vent 34 communicates with the gas outlet pipeline 30, so that the low-temperature gas in the gas outlet passage can be sent into the rotary heater 11 through the air vent 34 to the radial passage 33 and the axial passage 32, so as to further improve the heat insulation capacity and cool the gas inlet cover 18 to prolong the service life of the gas inlet cover 18.

[0058] The axial passage 32 communicates with the high-temperature gas inlet passage 35 in the gas inlet cover 18, that is, the axial passage 32 communicates with the high-temperature gas inlet passage 35 in the gas inlet cover 18. The communication hole 36 with a smaller size than the cross section of the axial passage 32 is arranged at the communication position of the axial passage 32 and the high-temperature gas inlet passage 35. Here, the low-temperature gas in the axial passage 32 can be mixed with the high-temperature flue gas to enter the high-temperature heating passage 17 in the rotary heater 11 through the communication of the axial passage 32 and the high-temperature gas inlet passage 35, so as to adjust the temperature of the high-temperature flue gas entering the rotary heater 11 as required; and the communication hole 36 can increase the flow capacity of the gas in the axial passage 32 to the high-temperature gas inlet passage 35 and better mix with the high-temperature flue gas. Of course, the communication hole 36 is not limited to the through hole in the plate, but a baffle can be arranged at the end of the axial passage 32, and the communication hole 36 is formed by the gap between the baffle and the inner wall of the axial passage 32.

[0059] In order to further reduce the temperature of the kiln body outside the periphery between the rotary heater 11 and the air inlet cover 18, the gas passage structure further comprises a second isolation component 37 arranged on the outer peripheral wall of the rotary heater 11. The second isolation component 37 can be fixedly arranged on the outer peripheral wall of the rotary heater 11. The second isolation component 37 is located on the inner side of the first isolation component 31. A rotating seal is formed between the inner side of the first isolation component 31 and the second isolation component 37. That is, a sealing ring 38 can be fixedly arranged on the inner side of the first isolation component 31. The two ends of the sealing ring 38 extend towards the two ends of the first isolation component 31 to increase the distance between the end of the sealing ring 38 and the air inlet cover 18. A rotating seal 39 is arranged between the end of the sealing ring 38 and the outer wall of the second isolation component 37 to seal it. An annular spacing passage 40 is formed between the inner wall of the second isolation component 37 and the outer peripheral wall of the rotary heater 11. The spacing passage 40 is arranged axially along the outer peripheral wall of the rotary heater 11. That is, the length of the spacing passage 40 on both sides of the air inlet cover 18 is increased to increase the heat insulation distance.

[0060] In order to introduce low-temperature gas into the spacing passage 40, an air inlet pipe assembly 41 is arranged in the rotary heater 11 and is in communication with the spacing passage 40. The air inlet pipe assembly 41 is rotatably connected to a rotating support component 42 at the end of the rotary heater 11. The rotating support component 42 is a component that supports the rotation of the rotary heater 11 and is a commonly used component of the rotary heater 11. A first rotary joint 43 is arranged on the rotating support component 42 and is connected to the air inlet pipe assembly 41. The first rotary joint 43 is in communication with the gas outlet pipe 30. The air inlet pipe assembly 41 comprises a radial pipe arranged radially in the rotary heater 11 and an axial pipe in communication with the radial pipe. The axial pipe is rotatably arranged on the rotating support component. The radial pipe is in communication with the spacing passage 40. The first rotary joint 43 is located on the outer side of the rotating support component. The first rotary joint 43 is connected to the gas outlet pipe 30. That is, the low-temperature gas in the gas outlet pipe 30 can enter the spacing passage 40. The spacing passage 40 can also be connected to an exhaust port for discharging the gas in the spacing passage 40 to continuously flow in the low-temperature gas and enhance the heat insulation capacity.

[0061] The flow guide structure can be a spiral passage, a flow guide plate, or a flow guide hole plate. The main purpose is to lengthen the flow path of the gas in the passage to improve the heat insulation capacity.

[0062] In order to process the gas discharged through the gas outlet channel in the gas outlet cover 19, a waste heat utilization device 44, a gas purification device 45, and a pressurized fan 46 can also be provided. The waste heat utilization device 44 (heat exchanger) is connected to the gas outlet channel, i.e., the exhaust gas discharged from the rotary heater 11 has a high temperature, which can be utilized by the waste heat utilization device 44 to reduce the temperature of the exhaust gas. For example, the air entering the combustion furnace 13 can be preheated to increase the temperature of the air entering the combustion furnace 13. The waste heat utilization device 44 is connected to the gas purification device 45, which can filter the particulate impurities in the exhaust gas and purify the gas. The gas outlet end of the gas purification device 45 is connected to the pressurized fan 46, which is in communication with the air inlet 34. The pressurized fan 46 can generate a certain pressure in the gas entering the first heat insulation assembly, so that the gas can enter the high-temperature gas inlet channel 35 and mix with the high-temperature flue gas more stably.

[0063] Two air pipes can be divided at the outlet of the pressurized fan 46, one of which is in communication with the air inlet 34, and the other is in communication with the first rotary joint 43. The pressurized fan 46 sends low-temperature gas to the spacing channel 40, the axial channel 32, and the radial channel 33. The gas channel structure arranged between the gas inlet cover 18 and the rotary heater 11 can use the same material as the original main material, and the thickness can be appropriately reduced. The maximum working temperature of the main material of the rotary heater 11 is ≤300℃. The second isolation component 37 is relatively unaffected by external forces, so the material used to make the second isolation component 37 can be reduced in thickness, and the maximum working temperature is ≤500℃. The working temperature at the communication hole 36 at the end of the axial channel 32 is about 2 / 3 of the temperature of the high-temperature flue gas. The above structure design reduces the heat diffusion ability of the gas inlet cover 18 towards the kiln body, thereby reducing the temperature at the gas inlet of the rotary heater 11, reducing the requirements for the material of the rotary heater 11, and reducing the probability of thermal deformation at the gas inlet of the rotary heater 11. At the same time, the possibility of internal thermal insulation refractory material falling off is also reduced, and the manufacturing cost of the rotary heater 11 is reduced, and the safety is improved.

[0064] Please refer to Figures 5-10As shown, the high-temperature material discharged from the rotary heater 11 is directly discharged into the cooling kiln 12, and the material is stored in the cooling kiln 12 to avoid material storage in the rear part of the heating kiln and reduce failure points. The cooling kiln 12 can form a rotary operation, and has a hot material inlet 47 and a cold material outlet 48, the hot material inlet 47 is in communication with the material discharge end of the rotary heater 11; the cooling kiln 12 forms a cooling material channel 49 in communication with the hot material inlet 47 and the cold material outlet 48, the high-temperature material discharged from the end of the rotary heater 11 enters the cooling kiln 12 from the hot material inlet 47, and is discharged from the cold material outlet 48 after cooling,

[0065] The first heat recovery pipe group and the second heat recovery pipe group are arranged along the length direction of the cooling kiln 12 in the inner wall of the cooling kiln 12 to cool the high-temperature material and obtain heat from the high-temperature material, the first heat recovery pipe group is close to the side of the hot material inlet 47, and the second heat recovery pipe group is close to the side of the cold material outlet 48, the entering high-temperature material is cooled first, and the high-temperature material after heat recovery of the first heat recovery pipe group is further recovered to further reduce the temperature of the high-temperature material, the heat exchange gas is introduced into the first heat recovery pipe group, and the heat exchange water is introduced into the second heat recovery pipe group. After the heat exchange gas in the first heat recovery pipe group cools the high-temperature material, the temperature is increased, and the heat exchange gas can be used for heating equipment, drying equipment, as high-temperature air distribution in the combustion furnace 13, and other use occasions requiring high-temperature gas. The heat exchange water in the second heat recovery pipe group is low-temperature, and after cooling the high-temperature material, high-temperature water is discharged and can be stored for heating water equipment or hot water users. By first introducing the heat exchange gas into the first heat recovery pipe group, the heat exchange gas in the first heat recovery pipe group can obtain better temperature rise, and the use scene of the high-temperature heat exchange gas is increased.

[0066] The first heat recovery pipe group at least includes a first heat recovery gas pipe 50 arranged in the inner wall of the cooling kiln 12, the first heat recovery gas pipe 50 extends from the hot material inlet 47 to the inner wall of the middle part of the cooling kiln 12 and is arranged in the inner wall of the cooling kiln 12 to form a first heat recovery gas pipe layer, and the two ends of the first heat recovery gas pipe 50 extend to the outside of the cooling kiln 12, one end is used as a gas inlet end, and the other end is used as a gas outlet end. The first heat recovery gas pipe 50 can be arranged in the cooling kiln 12 in a meandering or spiral manner to increase the heat exchange area of the first heat recovery gas pipe 50 in the cooling kiln 12, accelerate the cooling effect of the high-temperature material, and increase the temperature rise of the gas in the first heat recovery gas pipe 50.

[0067] In order to further obtain the cooling capacity of high-temperature materials and increase the flow of heat exchange gas, the first heat recovery pipe group further comprises a second heat recovery gas pipe 51 arranged inside the first heat recovery gas pipe layer. The second heat recovery gas pipe 51 is arranged in the same way as the first heat recovery gas pipe 50. The second heat recovery gas pipe 51 forms a second heat recovery gas pipe layer inside the first heat recovery gas pipe layer, that is, from the radial direction of the cooling kiln 12, the first heat recovery gas pipe 50 is outside the second heat recovery gas pipe 51. Of course, a third heat recovery gas pipe or more can be added according to needs. The heat recovery gas pipe is not limited to being arranged at the inner circumferential position of the cooling kiln 12, but can also be arranged at the central position in the diameter direction of the cooling kiln 12. The number and arrangement position of the heat recovery gas pipe are set according to needs.

[0068] The second heat recovery pipe group comprises a water distribution chamber 52, a water collection chamber 53, a second rotary joint 54, and a heat recovery water pipe group 55. The second rotary joint 54 is assembled at one end of the cooling kiln 12 close to the cold material outlet 48. The second rotary joint 54 comprises an inlet water passage 56 and an outlet water passage 57. The inlet water passage 56 is outside the outlet water passage 57. The water distribution chamber 52 is in communication with the inlet water pipe. The water collection chamber 53 is in communication with the outlet water passage 57. The heat recovery water pipe group 55 is connected between the water collection chamber 53 and the water distribution chamber 52. The heat recovery water pipe group 55 extends from the cold material outlet 48 to the inner circumferential direction of the middle of the cooling kiln 12. Here, low-temperature cold water is mainly used to enter the water distribution chamber 52 through the inlet water passage 56, and the low-temperature cold water is sent into the heat recovery water pipe group 55 through the water distribution chamber 52. The low-temperature cold water is used to cool the high-temperature materials while increasing the temperature of the low-temperature cold water, forming high-temperature hot water. The high-temperature hot water is collected through the water collection chamber 53 and then discharged through the outlet water passage 57. In this way, the high-temperature materials are cooled, and the low-temperature cold water is recycled through the increase in temperature. The heat recovery water pipe group 55 can also be arranged in the cooling kiln 12 in a spiral or winding manner to increase the heat exchange area in the cooling kiln 12, thereby accelerating the cooling effect of the high-temperature materials and increasing the temperature rise of the cold water in the heat recovery water pipe group 55.

[0069] The water distribution chamber 52 and the water collection chamber 53 are arranged inside or outside the cooling kiln 12 near the cold material outlet 48, i.e. the water distribution chamber 52 and the water collection chamber 53 are arranged inside the end of the cooling kiln 12, the outer sealing plate 58 and the inner sealing plate 59 are fixedly arranged at the end of the cooling kiln 12, the water collection chamber 53 is formed between the outer sealing plate 58 and the inner sealing plate 59, the rear cylinder 60 is fixed to the inner side of the inner sealing plate 59, the water distribution chamber 52 is formed in the rear cylinder 60, and the rear cylinder 60 is in communication with the pipe body 61 forming the water outlet channel 57, so as to form the water distribution chamber 52 and the water collection chamber 53 in the cooling kiln 12. Of course, a part of the components from the right end of the rear cylinder 60 to the left side can be arranged outside the cooling kiln 12 to form the water distribution chamber 52 and the water collection chamber 53 outside the cooling kiln 12.

[0070] The heat recovery water pipe group 55 includes a plurality of heat recovery water pipes 62 in communication between the water collection chamber 53 and the water distribution chamber 52, and the plurality of heat recovery water pipes 62 are distributed around the inner wall of the cooling kiln 12. From the radial direction of the cooling kiln 12, at least one layer of heat recovery water pipe layer is formed along the radial direction of the cooling kiln 12. It is meant that a plurality of heat recovery water pipes 62 are connected in parallel between the water collection chamber 53 and the water distribution chamber 52, and the plurality of heat recovery water pipes 62 are used to guide the water in the water distribution chamber 52 to the water collection chamber 53, and in the process of flowing, the high-temperature materials are cooled and the temperature of the heat recovery water pipes 62 is increased. In order to obtain better heat recovery and cooling effect, a plurality of layers of heat recovery water pipe layers can be arranged in the radial direction of the cooling kiln 12.

[0071] The baffle assembly is arranged in the cooling kiln 12 along the axial length of the first heat recovery pipe group or / and the second heat recovery pipe group. The baffle assembly includes a plurality of baffles 63 fixedly arranged at intervals in the cooling kiln 12, and a connecting rod 64 for connecting the baffles 63 to enhance the stability of the baffles. The flow path of the high-temperature materials in the cooling material channel 49 is prolonged by the baffles 63 to enhance the cooling effect of the high-temperature materials.

[0072] The gas inlet end of the first heat recovery gas pipe 50 is provided with an inlet expansion joint 65 to compensate for the deformation of the pipe caused by thermal expansion and contraction and to reduce the risk of leakage at the pipe connection.

[0073] The rotary heater 11 is divided into two sections, forming a double cooling structure, i.e. the high-temperature section is cooled by air and the low-temperature section is cooled by water. The tube heat exchange structure is combined with the rotary heater 11 to increase the heat exchange area, reduce the length and diameter of the kiln body, save the investment cost and land area of the cooling kiln 12, and realize energy conversion and energy saving. The hot air in the high-temperature zone can be used as the air for drying materials, heating, and combustion, and the cooling kiln 12 adopts a double cooling mode to fully utilize the preheating, the preheated air is heated and then used for water cooling in the rear part, the material is discharged from the cooling kiln 12 at a temperature below 250℃, and the material is easy to collect.

[0074] Please refer to Figure 11 As shown in the figure, the volatile component discharge end 66 of the rotary heater 11 is provided with a separation treatment device for guiding the tar gas and the corresponding impurity-containing dust to flow into and be treated in the separation device; the separation treatment device includes an indirect heat exchange device 67, a cooling device 68, and a gas-solid separation device 69; the indirect heat exchange device 67 exchanges heat between the high-temperature side and the low-temperature side without contact, which is mainly used to avoid the mixing of tar gas and other media, thereby affecting the subsequent separation effect; the cooling device 68 is used to cool the high-temperature medium by not contacting the low-temperature medium, thereby reducing the temperature of the high-temperature medium and achieving the cooling effect; the gas-solid separation device 69 can separate the gas-solid mixture into gas and solid, which is a bag dust collector to obtain good gas permeability and high dust removal efficiency.

[0075] The volatile component discharge end 66 is connected to the secondary side inlet of the indirect heat exchange device 67, the secondary side outlet of the indirect heat exchange device 67 is connected to the secondary side inlet of the cooling device 68, the secondary side outlet of the cooling device 68 is connected to the inlet of the gas-solid separation device 69, the tar-containing gas enters the secondary side of the indirect heat exchange device 67 through the volatile component discharge end 66, high-temperature fluid medium is introduced into the primary side of the indirect heat exchange device 67 to raise the temperature of the tar-containing gas in the secondary side, the tar-containing gas is treated, and the cooling device 68 can cool the high-temperature gas-solid mixture discharged from the secondary side of the indirect heat exchange device 67 to reduce the temperature of the high-temperature gas-solid mixture entering the gas-solid separation device 69, thereby reducing the damage to the gas-solid separation device 69. The cooling device 68 also uses an indirect heat exchanger through which low-temperature water / low-temperature refrigerant is introduced; an induced draft fan 70 is installed at the discharge end of the gas-solid separation device 69 to assist the flow of the tar-containing gas in the corresponding pipeline system; specifically, the high-temperature flue gas generated by the combustion furnace 13 provides heat source for the indirect heat exchange device 67, so that the temperature of the volatile components in the secondary side of the indirect heat exchange device 67 rises to 1100-1200°C, and under this temperature environment, the long-chain molecules in the tar gas can be cracked into small-molecule gas (CO, H2, CH4), which is cooled by the cooling device 68, and then the fine powder contained in the gas is separated by the gas-solid separation device 69, so that small-molecule gas can be obtained and discharged through the flow guide of the induced draft fan 70. The fine powder discharge end at the bottom of the gas-solid separation device 69 is connected to the material discharge end of the rotary heater 11, that is, the fine powder material discharged from the end of the rotary heater 11 enters the cooling kiln 12 for recycling. The cooling device 68 cools the gas-solid mixture after the tar in the volatile components is cracked by the indirect heat exchange device 67 to a low-temperature gas-solid separation temperature of 120-160°C and then enters the gas-solid separation device 69 for gas-solid separation.

[0076] The first pipeline 71 and the second pipeline 72 are connected to the discharge end of the induced draft fan 70, and control valves are installed on the first pipeline 71 and the second pipeline 72 respectively to control the gas flow in each pipeline; the small-molecule gas discharged from the first pipeline 71 can be stored as combustible gas; the second pipeline 72 is connected to the combustion furnace 13, that is, the small-molecule gas is sent into the combustion furnace 13 for combustion, so that the combustion furnace 13 can generate high-temperature gas, the gas discharge end of the combustion furnace 13 is connected to the primary side inlet of the indirect heat exchange device 67, and the high-temperature gas generated in the combustion furnace 13 can be sent into the primary side of the indirect heat exchange device 67 to exchange heat with the tar-containing gas in the secondary side in a non-contact manner, so that the tar-containing gas is heated and cracked. The primary side outlet of the indirect heat exchange device 67 is connected to a waste gas discharge pipeline 73 for discharging low-temperature gas from the primary side. Of course, the indirect heat exchange device 67 can also be directly arranged at the tail end of the combustion furnace 13 to perform direct combustion heat exchange in the combustion furnace 13.

[0077] And the indirect heat exchange device 67 can adopt silicon carbide shell heat exchanger, so that the high temperature gas generated in the combustion furnace 13 can efficiently heat exchange and heat the tar-containing gas, so that the tar-containing gas cracking process is more stable.

[0078] Wherein, the induced draft fan 70 is driven by a variable frequency motor, mainly to make the induced draft fan 70 have variable speed induced draft capacity, such as can be adjusted according to the air flow into the volatile part discharge end 66, when the air flow is small, the speed of the induced draft fan 70 can be increased, the flow of the induced draft fan 70 can be accelerated, when the air flow is large, the speed of the induced draft fan 70 can be reduced, the flow of the induced draft fan 70 can be reduced, so that the time of the tar-containing gas in the indirect heat exchange device 67 is slightly extended, that is, the cracking time of the tar-containing gas in the indirect heat exchange device 67 is also extended, so as to ensure the stability of the tar-containing gas cracking.

[0079] The heat exchanger 74 is arranged between the exhaust gas discharge pipeline 73 and the air inlet pipe of the combustion furnace 13, which can be combined with the above-mentioned waste heat utilization device 44, or arranged on the air inlet pipe of the combustion furnace 13 according to the temperature of the heat supply gas from low to high. The high temperature exhaust gas in the exhaust gas discharge pipeline 73 and the low temperature air in the air inlet pipe form heat exchange. In order to obtain a combustion environment in the combustion furnace 13, a certain amount of air is introduced into the combustion furnace 13, and the exhaust gas discharged from the exhaust gas discharge pipeline 73 can preheat the air entering the combustion furnace 13, so as to reduce the heat loss in the combustion furnace 13.

[0080] The indirect heat exchange device 67 can be provided with a temperature sensor for detecting the temperature of the volatile matter in the secondary side of the indirect heat exchange device 67. The temperature sensor can monitor the cracking temperature of the tar-containing gas, and the cracking condition of the tar-containing gas can be obtained accordingly. Of course, the temperature sensor can also cooperate with the control valves on the first and second pipelines to operate, that is, when the temperature sensor monitors that the temperature value is higher than or within the set range, the opening degree of the control valve on the second pipeline 72 can be reduced, the amount of combustible gas entering the combustion furnace 13 can be appropriately reduced, and the opening degree of the control valve on the first pipeline 71 can be increased, the flow of combustible gas in the first pipeline 71 can be increased; when the temperature value monitored by the temperature sensor is lower than the set range, the opening degree of the control valve on the second pipeline 72 needs to be increased, the flow of combustible gas in the second pipeline 72 needs to be increased, and the combustion capacity of the combustion furnace 13 needs to be improved, so as to reasonably utilize the combustible gas and avoid resource waste.

[0081] Finally, it should be noted that: the above is only the preferred embodiment of the utility model, and is not used to limit the utility model, although the utility model is described in detail with reference to the foregoing embodiments, for the person skilled in the art, it still can modify the technical scheme recorded in the foregoing each embodiment, or make equivalent replacement to part of the technical features. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the utility model should be included in the protection scope of the utility model.

Claims

1. A lithium battery negative electrode material pre-carbonization system, comprising a feeding mechanism, a rotary heater, a cooling kiln and a combustion furnace, the discharge end of the feeding mechanism is in communication with the feeding end of the rotary heater for feeding the negative electrode material into the rotary heater; the material discharge end of the rotary heater is in communication with the entering end of the cooling kiln for the carbonized material in the rotary heater to enter the cooling kiln; the flue gas discharge end of the combustion furnace is in communication with the high-temperature heating channel in the rotary heater, characterized in that: the rotary heater is externally provided with an air inlet cover and an air outlet cover, and a plurality of material channels are arranged in the rotary heater, a high-temperature heating channel in communication with the air inlet cover and the air outlet cover is arranged outside each material channel, and the flue gas discharge end of the combustion furnace is in communication with the air inlet cover; a gas channel structure is arranged between the air inlet cover and the rotary heater. The air outlet cover is connected with an air outlet pipeline for discharging the gas medium in the high-temperature heating channel from the air outlet cover, and the gas medium in the air outlet pipeline is cooled and then enters the combustion furnace and the gas channel structure. The feeding end of the rotary heater is provided with a distribution cavity, and each material channel in the distribution cavity is provided with a distributor at the end portion, and the distributor guides the material in the distribution cavity into the corresponding material channel; the distributor is an inclined receiving groove arranged at the end portion of the material channel.

2. The lithium battery anode material pre-carbonization system of claim 1, wherein, The rotary heater is assembled by a segmented heater body, and an intermediate connecting section is arranged between the segmented heater bodies, the intermediate connecting section comprises an intermediate connecting shell fixedly connected with the segmented heater body, a communication channel in communication with the material channel is arranged in the intermediate connecting shell, and a gas communication pipeline in communication with the high-temperature heating channels between the segmented heater bodies is arranged in the intermediate connecting shell.

3. The lithium battery anode material pre-carbonization system of claim 1, wherein, A corrugated expansion structure is arranged in the communication channel; the gas communication pipeline comprises a first communication pipe, a second communication pipe and a wave tube, the first communication pipe and the second communication pipe are in communication with the heating channels in the segmented heater body, and the wave tube is in communication between the first communication pipe and the second communication pipe. The gas channel structure comprises a first isolation component spacing the air inlet cover and the peripheral wall of the rotary heater; 4. The lithium battery anode material pre-carbonization system of claim 1, wherein, An axial channel and a radial channel in communication with the axial channel are arranged in the first isolation component, the axial channel is arranged axially along the peripheral wall of the rotary heater, the axial channel is between the air inlet cover and the peripheral wall of the rotary heater, and the radial channel is on the outside of the air inlet cover; a gas inlet opening in communication with the radial channel is arranged on the first isolation component, the gas inlet opening is in communication with the above-mentioned air outlet pipeline, and the axial channel is in communication with the air inlet cover. The gas channel structure further comprises a second isolation component covering the peripheral wall of the rotary heater, the second isolation component is on the inside of the first isolation component, a rotating sealing fit is formed between the inside of the first isolation component and the second isolation component, and an annular spacing channel is formed between the inner wall of the second isolation component and the peripheral wall of the rotary heater; 5. The lithium battery anode material pre-carbonization system of claim 4, wherein, An air inlet pipeline assembly in communication with the spacing channel is arranged in the rotary heater, the air inlet pipeline assembly is rotationally connected to a rotating support component at the end of the rotary heater, a first rotating joint in connection with the air inlet pipeline assembly is assembled on the rotating support component, and the first rotating joint is in communication with the above-mentioned air outlet pipeline. ​ 6. The lithium battery anode material pre-carbonization system of claim 1, wherein, The cooling kiln has a hot material inlet and a cold material outlet, the hot material inlet is communicated with the material discharge end of the rotary heater; a cooling material channel is formed in the cooling kiln and communicated with the hot material inlet and the cold material outlet; a first heat recovery pipe group and a second heat recovery pipe group are arranged along the length direction of the cooling kiln, the first heat recovery pipe group is close to the hot material inlet, and the second heat recovery pipe group is close to the cold material outlet; heat exchange gas is introduced into the first heat recovery pipe group, and heat exchange water is introduced into the second heat recovery pipe group.

7. The lithium battery anode material pre-carbonization system of claim 6, wherein, The first heat recovery pipe group at least comprises a first heat recovery gas pipe arranged on the inner wall of the cooling kiln, the first heat recovery gas pipe extends from the hot material inlet to the inner wall of the middle part of the cooling kiln and forms a first heat recovery gas pipe layer on the inner wall of the cooling kiln, and the two ends of the first heat recovery gas pipe extend to the outside of the cooling kiln, one end is used as a gas inlet end, and the other end is used as a gas outlet end.

8. The lithium battery anode material pre-carbonization system of claim 6 or 7, wherein, The second heat recovery pipe group comprises a water distribution chamber, a water collection chamber, a second rotary joint, and a heat recovery water pipe group, the second rotary joint is arranged at one end of the cooling kiln close to the cold material outlet, the second rotary joint comprises a water inlet channel and a water outlet channel, the water distribution chamber is communicated with the water inlet channel, the water collection chamber is communicated with the water outlet channel, and the heat recovery water pipe group is communicated between the water collection chamber and the water distribution chamber and extends from the cold material outlet to the inner wall of the middle part of the cooling kiln.

9. The lithium battery anode material pre-carbonization system of claim 1, wherein, The volatile discharge end of the rotary heater is provided with a separation treatment device, the separation treatment device comprises an indirect heat exchange device, a cooling device, and a gas-solid separation device; The volatile discharge end is connected with the indirect heat exchange device, the indirect heat exchange device is connected with the cooling device, the cooling device is connected with the inlet end of the gas-solid separation device, the gas discharge end of the gas-solid separation device is connected with the gas inlet end of the combustion furnace, and the solid discharge end of the gas-solid separation device is connected with the material discharge end of the rotary heater; The high-temperature flue gas generated by the combustion furnace provides a heat source for the indirect heat exchange device, so that the volatiles passing through the indirect heat exchange device are cracked at 1100-1200℃; the gas-solid mixture after the volatiles are cracked in the cooling device is cooled to a low temperature gas-solid separation temperature of 120-160℃ and then enters the gas-solid separation device.

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