A gas-fired multi-stage continuous drum furnace

Abstract

The present invention discloses a gas-fired multi-stage continuous roller furnace, which sequentially includes a low-temperature section furnace body and a high-temperature section furnace body that are interconnected. The roller furnace also includes accessories connected to the furnace body. Each furnace body is composed of a furnace shell, a furnace lining, and a furnace pot. A gas heating component and a material dispersion component are provided in each furnace pot. The material dispersion component is that material stirring plates are circumferentially spaced along the inner wall in each furnace pot, and the width of each material stirring plate is less than the radius of the furnace pot. By adding combustion burners to each furnace pot, the roller gas furnace can achieve a rapid temperature rise of the furnace body, which helps to achieve a better drying effect on materials such as battery graphite, and solves the problems of slow heating speed, high energy consumption, and unfavorable rapid temperature rise and forming of materials existing in the current use of electric heating wires for furnace body heating. The rotation of the material stirring plates fully disperses and stirs the materials, enabling the materials to be evenly heated, so as to ultimately reduce the energy consumption of the furnace body and improve the heating quality of the materials.

Description

Technical Field

[0001] The present invention relates to the technical field of heating and drying of graphite materials, and particularly to a gas-fired multi-stage continuous drum furnace. Background Art

[0002] Graphite has excellent electrical conductivity and can be used as the negative electrode material of a battery. The technological process of graphite powder is as follows: the blasted raw ore is sent into a stone crusher by a mine car for crushing, then into a ball mill for flotation. The floated wet graphite material is sent back into the ball mill for grinding and concentration. The concentrated wet material is bagged and sent into a draining machine for draining to become drained material, which is already the finished graphite product. The drained material is sent into a drying workshop, dried and bagged to obtain ordinary graphite powder, and the average carbon content of the finished product is 90%.

[0003] Currently, when drying graphite materials, a conventional heating furnace is used for drying. Specifically, the graphite powder to be dried is loaded into the furnace chamber, and the furnace body is heated and raised in temperature by electric heating wires, and the heat is conducted to the graphite material for drying. Since the graphite material has a powdery structure, it accumulates when loaded into the furnace chamber, making the inside of the accumulated graphite material unable to be fully heated, resulting in uneven overall heating of the graphite material. In order to completely dry the loaded graphite material, usually, the heating power and heating duration of the electric heating wires of the furnace body are increased. Since the heat needs to be transferred from the furnace chamber to the graphite material after the electric heating wires are heated, there is a long heat conduction time, and on the basis of further increasing the heating power and heating duration, a large amount of energy consumption will be caused, which is not conducive to energy conservation and environmental protection. At the same time, the accumulation of the powdery graphite material in the furnace chamber causes uneven overall heating and inconsistent drying quality, affecting the drying quality and the finished product rate. Summary of the Invention

[0004] In view of the above problems, the present invention aims to provide a gas-fired multi-stage continuous drum furnace. By adding combustion burners to each furnace tank, the rapid temperature rise of the furnace body can be realized, which is helpful for better drying of materials such as battery graphite, and solves the problems of slow temperature rise speed, high energy consumption and unfavorable rapid temperature rise and forming of materials existing in the current use of electric heating wires for furnace body temperature rise. The material is dispersed and stirred to reduce the energy consumption of the furnace body and improve the heating quality of the material.

[0005] In order to achieve the above object, the technical solution adopted by the present invention is as follows: a gas-fired multi-stage continuous drum furnace, characterized in that it sequentially includes a low-temperature section furnace body and a high-temperature section furnace body that are interconnected. The drum furnace further includes accessories connected to the furnace body. Each furnace body is composed of a furnace shell, a furnace lining and a furnace tank, and a gas heating component and a material dispersion component are provided in each furnace tank.

[0006] Preferably, the gas heating component includes gas burners and combustion accessories evenly distributed in each furnace body.

[0007] Preferably, the material dispersion component is provided with material stirring plates along the circumferential spacing of the inner wall in each furnace tank, and the width of each material stirring plate is less than the radius of the furnace tank.

[0008] Preferably, a material receiving plate extends radially towards the center of the furnace tank near the feed port of each furnace tank for each material stirring plate, and a material blocking plate is vertically arranged on the outer side of the material receiving plate, and the material blocking plate and the side wall of the furnace tank form a material receiving cavity.

[0009] Preferably, the material receiving plate radially faces the inner wall of the furnace tank and together with the material stirring plate forms a first slope surface.

[0010] Preferably, the material stirring plate forms a second slope surface from the feed port direction of the furnace tank towards the discharge port direction.

[0011] Preferably, each material stirring plate is of a mesh structure.

[0012] The beneficial effects of the present invention are as follows: The drum gas furnace is mainly applicable to the heating treatments such as drying, roasting, coating, and granulation of battery graphite materials. By adding combustion burners to each furnace tank, rapid temperature rise of the furnace body can be achieved, which helps to achieve better drying of materials such as battery graphite, and solves the problems of slow heating rate, high energy consumption, and unfavorable rapid temperature rise and shaping of materials existing in the current use of electric heating wires for furnace body heating. Through the intelligent control of the furnace body, precise control can be achieved in multiple aspects such as the adaptive heating rate, heating temperature, heating time, cooling, and safety control according to the characteristics of the materials. Furthermore, on the basis of reducing energy consumption through gas heating, the intelligence of the furnace body is improved, which helps to perform adaptive heating and convenient adjustment of parameters according to different material characteristics.

[0013] When the material is conveyed to the feed port of the furnace tank of the low-temperature section furnace body by the screw feeder and enters the furnace tank to be heated, it slides and spreads through the material receiving plate, the first slope surface, the material stirring plate, and the second slope surface towards the other side of the material stirring plate, reducing the aggregation thickness of the material. After the material separates from the rotating material stirring plate, it can make the material separate, disperse, and be evenly heated along the entire side edge of the material stirring plate, so as to ultimately reduce the energy consumption of the furnace body and improve the heating quality of the material. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a front view structure diagram of the multi-stage continuous drum furnace of the present invention.

[0015] Figure 2 For the present invention Figure 1 Right view.

[0016] Figure 3This is a side view structural diagram of the low-temperature furnace body and the high-temperature furnace body of the present invention.

[0017] Figure 4 This is an internal vertical cutting structural diagram of the furnace pot of the present invention.

[0018] Figure 5 This is an internal horizontal cutting structural diagram of the furnace pot of the present invention.

[0019] Figure 6 This is a schematic diagram of the slope structure of the material stirring plate of the present invention.

[0020] Figure 7 This is a schematic diagram of the mesh structure of the material stirring plate of the present invention.

[0021] Figure 8 This is a physical diagram of the driving mechanism of the furnace pot of the present invention.

[0022] Among them: 3a - dispersing teeth; 4 - screw feeder; 5 - hopper; 6 - aggregate bin; 7 - armored thermocouple for material temperature; 8 - cooling kettle; 9 - φ350 pipeline; 10 - furnace body tail gas filtration system; 13 - condenser; 14 - hot air pipeline; 15 - gas pipeline. Detailed implementation manners

[0023] In order to enable those of ordinary skill in the art to better understand the technical solution of the present invention, the technical solution of the present invention will be further described below in conjunction with the drawings and embodiments.

[0024] Referring to Figures 1 to 8 A gas-fired multi-stage continuous drum furnace shown, successively includes a low-temperature furnace body 11 and a high-temperature furnace body 12 that are interconnected. As Figure 1 shown, by utilizing the characteristic of the self-weight of the material in the two heating sections, the material directly enters the feed port of the high-temperature furnace body 12 from the discharge port of the low-temperature furnace body 11, and enters the rotary heating furnace pot 1c in the high-temperature section along the φ350 pipeline under the action of its own gravity. The drum furnace 1 further includes accessories connected to the furnace body, and the accessories include the following:

[0025] Automatic feeding and discharging system: includes a screw feeder and a hopper connected to the feed port of the low-temperature furnace body 11; the power of the feed screw motor is 3KW, and an aggregate bin is respectively provided at the discharge section of each furnace body as the kiln tail of the heating furnace for material collection and is connected to the φ350 pipeline, and an armored thermocouple for measuring the material temperature (the temperature can be displayed in the upper computer system) is provided at this place.

[0026] Automatic material water cooling system: includes a cooling kettle and water cooling pipes (not shown in the figure) provided on the outer wall of the following furnace pot 1c, and the water consumption of the cooling water ≤ 15m 3 / h, so as to achieve the purpose of rapidly cooling the processing materials in the furnace pot 1c. In order to prevent the cooling water from stopping circulating, a dot-point pressure gauge (not shown in the figure) is set in the cooling water pipeline to detect the water pressure. Once the circulating water is underpressure, an alarm will be immediately issued to prompt the operator to solve the fault. At the same time, a thermocouple is provided on the return water pipeline to monitor the return water temperature.

[0027] Nitrogen protection system: A nitrogen protection system is provided at the discharging ends of the furnace bodies in the low-temperature section, medium-temperature section, and high-temperature section. It mainly consists of conventional accessories such as a flow meter, a gas pressure gauge, a manual valve, and an electromagnetic valve. The nitrogen consumption ≤ 60m 3 / h.

[0028] In order to effectively control the internal pressure of each furnace pot, a set of furnace pressure automatic control system is provided at the feeding section. A pressure transmitter is used to detect the pressure change in the furnace pot in real time, and the frequency of the tail gas induced draft fan and the electric control valve of the nitrogen pipeline are automatically adjusted to achieve the furnace pressure control effect. Generally, the furnace pressure is controlled at about +50Pa.

[0029] Furnace body tail gas filtration system: Two (one for standby) tail gas discharge pipeline systems are provided at the kiln head position of each section of the furnace body. It mainly consists of a manual valve, a tail gas filtration device, a tail gas condensation tower (one for standby), an induced draft fan, and pipelines, etc.;

[0030] Tail gas filtration device: An existing tail gas filtration device is adopted at the tail gas discharge port, which is mainly used for filtering dust in the tail gas. A manual butterfly valve is provided at the front and rear ends of the filtration device respectively for pipeline switching and cleaning of the filtration device. The tail gas pipe is installed vertically to prevent blockage caused by material accumulation;

[0031] Tail gas condensation tower (one for standby): The tail gas condensation tower is mainly used for collecting and filtering oily components such as asphalt in the tail gas. The filtered tail gas is discharged out of the factory through the induced draft fan.

[0032] Electrical control system: The electrical control mainly consists of a host computer, a temperature control cabinet, a PLC frequency converter cabinet, and a field touch screen, etc. The electrical control system adopts a host computer + Japanese conductive intelligent instrument + PLC (Siemens S7-1200) + touch screen (used to observe the mechanical operation status of each device on site. Once the device runs abnormally, the device can be operated on site to ensure the safe operation of the device). Each switch valve adopts a signal valve and is connected to the man-machine system. There should be an alarm mechanism for transmission faults or valve faults, and it is displayed on the man-machine interface. Both the site and the control room need to be equipped with a man-machine.

[0033] The combustion control system realizes the ignition of each combustion burner 2, the conversion between high and low fires, flame detection, the output of ignition success or failure signals, the implementation of the purging program before ignition, and the control of operating state parameters (such as pressure, flow rate, etc.).

[0034] The furnace body is longitudinally divided into 6 control sections, and each control section controls 2 burners. The temperature control of each section adopts advanced sequential pulse combustion technology. The PLC receives the furnace temperature control signals collected by the thermocouple in each section (a total of 1 thermocouple is set in each section), compares them with the set process temperature, calculates through PID, outputs signals, and controls the burning time and frequency of the large and small fires of each burner after pulse frequency division to control the furnace temperature.

[0035] The advantage of this combustion method is that it can better control the temperature uniformity in the furnace chamber, ensure the uniform distribution of the temperature field by strongly stirring the circulation of the furnace gas, and ensure the same heating rate at each point in the furnace after segmentation.

[0036] Introduction to the principle of multi-section continuous control:

[0037] The system can achieve heating / cooling functions. In the multi-section continuous combustion control system, the burners work in a state of continuous adjustment between large and small fires. Users can adjust the burners to the best state at one time according to requirements such as the power, mixing ratio, and spraying speed of the burners. In this way, each time the burners are started, the burners are in the best working state, which has obvious effects on improving combustion efficiency and reducing the pollution level of emissions. The hot air flow generated by the cooperation of multiple burners can generate a uniformly distributed temperature field in the furnace, improving the heating quality and temperature uniformity of the workpieces to be processed. By selecting a controller with a higher resolution and burners with appropriate power for control, the system can obtain a very high control linearity.

[0038] Temperature control loop: One thermocouple is set in each temperature zone, and its signals all enter the high-precision intelligent dual digital display temperature controller (SRS13A series). After PID calculation (and a dynamic calculation program is compiled with time), the intelligent instrument outputs a 4-20MA signal. This signal controls the burning time and frequency of the large and small fires of each burner after pulse frequency division to control the furnace temperature.

[0039] The temperature values of each temperature zone (including process temperature values, set temperature values, over-temperature values, execution time, etc.) and the working states of each burner (flameout, ignition, large fire, small fire, etc.) can be displayed and stored graphically on the upper computer, facilitating on-site operators to understand the working conditions of the system. In addition, alarms are generated for abnormal working states of each burner and over-temperature states of each temperature zone, and Chinese prompts can be output on the upper computer.

[0040] The upper computer system can preset the temperature curve, and the actual heat treatment process executed by the PLC can be automatically carried out according to the set curve.

[0041] This equipment adopts temperature control for 6 zones in the low-temperature section + 6 zones in the medium-temperature section + 6 zones in the high-temperature section. On each side of each zone on each section of the furnace body, one K-type thermocouple is provided for temperature control and recording, one is connected to the intelligent temperature control instrument, and the other is connected to the temperature recorder.

[0042] The power control system mainly completes the power supply of the whole system, the start and stop of the combustion-supporting fan, the rotation control of the furnace pot, etc., and sets protections such as overvoltage, overcurrent, and short circuit in the system. Electric energy consumption measurement is set in the system and displayed on the upper computer.

[0043] The furnace body accessories (various components) not marked in the figure above are all existing products, and their structures, working principles, and installation methods are all known.

[0044] Each said furnace body is composed of a furnace shell 1a, a furnace lining 1b, and a furnace pot 1c. The furnace shell 1a is preferably welded by section steel and plates. The furnace shell adopts a side-detachable block assembly structure, which is convenient for maintenance inside the furnace pot, replacing the gas heating components. The connections are fixed into a whole with high-strength bolts, and a heat-insulating layer is made of aluminosilicate fiber to prevent heat loss.

[0045] The furnace lining 1b uses folded blocks of aluminosilicate fiber as the heat-insulating layer and is fixed on the furnace shell by compression with heat-resistant steel rivets. The fiber is selected as high-temperature-resistant fiber cotton, and the maximum temperature resistance coefficient is 1050 °C. The aluminosilicate fiber blanket is laminated and pressed into a cotton block with a total thickness of 250 mm. A 50-mm-thick standard aluminosilicate fiber blanket is laid flat on the steel plate and fixed on the shell by anchor bolts. The material of the anchor bolts is SUS304, and the total thickness of the furnace lining is 300 mm.

[0046] To make the sintering in the furnace pot 1c uniform, a set of furnace pot driving devices are provided for both the low-temperature section and the high-temperature section furnace bodies, which are composed of a reducer, a pair of large and small gears, front and rear roller supports, etc. (as Figure 8 shown). The rotation of the furnace pot is achieved by driving the pair of large and small gears through the reducer. To ensure meeting the material process requirements, a frequency converter is used to adjust the speed of the motor on the reducer. The motor can be controlled for forward and reverse rotation, and the speed adjustment is convenient, flexible, and reliable. The speed is 1 - 5 r / min (adjustable). The net size of the heating area of the furnace pot 1c is φ1400×13000 mm, the rotation speed of the furnace pot 1c is 1 - 5 rpm / min (frequency conversion speed regulation), and the power of the furnace pot rotation motor is 22 KW.

[0047] A gas heating component and a material dispersion component are provided in each said furnace pot 1c. The gas heating component includes gas burners 2 evenly distributed in each said furnace body and combustion accessories. The combustion accessories include a natural gas pipeline, an air pipeline, various valves, and electric actuators.

[0048] Among them, preferably, the power of the gas burner 2 in the low-temperature section furnace body 11 is 50 kw, and the temperature is 450 °C; for the high-temperature section furnace body 12, it is 70 kw and the temperature is 650 °C. The burners are SIC high-speed burners manufactured by Guangzhou Shineng. This equipment uses a total of 24 high-speed burners (12 sets of burners for each furnace body section), and they are arranged in a staggered manner at the lower part on both sides of the furnace chamber.

[0049] The gas accessories also include a combustion-supporting air system, which consists of a high-pressure centrifugal blower equipped with a frequency converter for adjustment, a hot air electric control butterfly valve, pipelines, etc. The electric hot air control valve (the frequency converter automatically adjusts the motor speed) can adjust the pressure and flow rate of the combustion-supporting air to prevent the blower from surging. A silencer is installed at the air inlet of the blower to ensure that the noise is ≤85 db at a distance of 1.5 meters from the blower. A shock-absorbing device is provided at the blower base, and a flexible connection is used at the connection between the blower outlet and the pipeline to reduce pipeline vibration and foundation vibration and ensure the working environment of the workshop.

[0050] An automatic pressure measuring device and a relief valve are provided at the blower outlet. An expansion joint is also installed on the hot air pipeline, and an explosion-proof membrane is installed on the branch pipeline. The place where the explosion-proof membrane is installed is covered with a steel wire mesh. The hot air pipeline coming out of the heat exchanger is insulated with 50-mm-thick aluminum silicate fiber blanket in accordance with GB4272-84 General Rules for Equipment and Pipeline Heat Insulation Technology and is wrapped with thin aluminum sheet on the outermost layer. The cold air reaches 150 - 300 °C after passing through the heat exchanger and is mixed with gas for combustion to achieve energy-saving effect.

[0051] The gas accessories also include a natural gas pipeline system. A manual cut-off valve, a filter, a pressure transmitter, an emergency cut-off electric valve, a relief valve, a turbine flowmeter, a high-pressure switch, a low-pressure switch, a pressure gauge, a pressure reducing valve, etc. are provided on the total natural gas inlet pipe. The pipeline has functions of overpressure and underpressure alarm, emergency cut-off, and automatic relief. The pressure and flow rate on the pipeline can be checked, and sufficient safety protection measures are provided throughout the pipeline. Filters, emergency cut-off electric valves, relief valves, pressure reducing valves, high-pressure switches, low-pressure switches, etc. are all products of Guangzhou Shineng.

[0052] A manual ball valve and a high / low fire solenoid valve are provided on the pipeline before the burner. The pipeline is connected by a union, which is convenient for disassembly, and the air-fuel ratio can be automatically adjusted. Each burner is equipped with a control box, and a burner controller, an ignition transformer, etc. are mainly installed in the control box. High / low fire solenoid valves, burner controllers, ignition transformers, etc. are all products of Guangzhou Shineng.

[0053] The installation of all pipelines and valve parts and the spraying of paint comply with relevant national regulations or industry standards and can be configured by technicians in this field, so they are not marked in the figure.

[0054] The gas accessories also include an exhaust system, which consists of a furnace pressure automatic control system, a waste heat recovery system, etc., and adopts the method of discharging smoke through a steel chimney. There is an exhaust port. The flue gas is discharged after preheating the air by 150 - 300 °C through an efficient tubular heat exchanger, saving energy and improving the thermal efficiency.

[0055] This furnace is equipped with a cylindrical air heat exchanger to preheat the air. A detection thermocouple is set at the hot air outlet of the preheater. The preheating temperature of the air does not exceed 450 °C. The hot air temperature is automatically measured and displayed, and an alarm is given when the temperature exceeds the limit. The tube-and-shell heat exchanger pipe fittings are made of 1Cr18Ni9Ti material, and turbulators are provided inside to enhance the heat exchange effect.

[0056] The furnace uses an up-draft steel chimney. The chimney is rolled from 5 mm high-quality steel plates, with internal thermal insulation treatment. The thermal insulation material is made of fiber blanket. The smoke exhaust flue is fabricated in sections and connected by high-strength bolts. After surface rust removal treatment, high-temperature silicone paint is sprayed.

[0057] This furnace is equipped with a furnace pressure automatic control system to adjust the internal pressure of the furnace chamber. The level of the furnace chamber pressure directly affects the thermal efficiency of the annealing furnace. If the furnace chamber pressure is too high, hot air in the furnace will overflow to the outside; if the furnace chamber pressure is too low, cold air outside will be sucked into the furnace chamber. The furnace pressure adjustment is mainly controlled by the flue damper on the flue. The pressure tapping port is generally set at 100 mm above the upper end of the trolley surface on the rear wall of the furnace body. The flue damper plate is made of 1Cr18Ni9Ti steel plate, and the actuator uses the Yangzhou Guangrong UNIK400 electric actuator with 4 - 20 mA output. According to the feedback signal of the furnace pressure transmitter, the opening degree of the flue damper plate is adjusted to achieve the effect of adjusting the furnace pressure.

[0058] The pressure transmitter detects the furnace pressure, and the flue damper automatically adjusts the furnace pressure;

[0059] A smoke exhaust thermocouple is set to detect the smoke exhaust temperature, and a cold air mixing device is provided;

[0060] A hot air thermocouple is set to detect the hot air temperature, and a hot air automatic relief device is provided;

[0061] The flue gas passes through the heat exchanger to provide the hot air temperature, realizing waste heat recovery and improving the thermal efficiency;

[0062] An over-temperature alarm for the flue gas temperature and the combustion-supporting air temperature is set.

[0063] The above-mentioned gas accessories (various components) not marked in the figure all adopt existing products, and their structures, working principles, and installation methods are all known, enabling the furnace body disclosed in this application to achieve intelligent control and effectively improving the heating quality of the materials heated inside.

[0064] To improve the uniformity of the material heating in each furnace pot 1c, such as Figure 4As shown, the material dispersion component is provided with material stirring plates 3 circumferentially spaced along the inner wall in each furnace pot 1c, and the width of each material stirring plate 3 is less than the radius of the furnace pot 1c. When the material is conveyed to the feed port of the furnace pot 1c of the low-temperature furnace body 11 by a screw feeder and enters the furnace pot 1c, the material will fall onto the corresponding material stirring plate 3. As the material stirring plate 3 rotates with the furnace pot 1c, the material is dispersed from its side and falls to the bottom of the furnace pot 1c, and then falls onto the corresponding material stirring plate 3 through the rotation of other material stirring plates 3. During the continuous rotation of the furnace pot 1c, the material falls onto the material stirring plate 3 and falls from its side onto other material stirring plates 3 with the rotation of the material stirring plate 3. In this way, through the dispersion method of the material falling suspended from the side of the material stirring plate 3, the thickness of the aggregated material can be reduced to a thin-layered dispersed structure after dispersion. During the process of the material falling suspended from the side of the material stirring plate 3, the material does not contact the inner wall of the material stirring plate 3 and the furnace pot 1c, and with the relatively thin thickness of the dispersed layer, the material can be heated sufficiently and evenly, thereby quickly raising the temperature of the material and reducing the power consumption of the furnace body.

[0065] Similarly, the material that is evenly heated in the low-temperature furnace body 11 and discharged from its discharge port enters the furnace pot 1c of the high-temperature furnace body 12, achieving the same even heating as the furnace pot 1c of the low-temperature furnace body 11, improving the overall evenness of the material heating and effectively shortening the heating time, and reducing the large energy consumption of the furnace body.

[0066] In order to enable the material to effectively fall onto the material stirring plate 3 when entering each furnace pot 1c, so as to achieve the stirring and even heating effects of rotational dispersion, as Figure 5 shown, a material receiving plate 31 extends radially towards the center of the furnace pot 1c near the feed port of each furnace pot 1c for each material stirring plate 3, and a baffle plate 32 is vertically arranged outside the material receiving plate 31. The baffle plate 32 and the side wall of the furnace pot 1c form a material receiving cavity 301. When the material is conveyed to the feed port of the furnace pot 1c of the low-temperature furnace body 11 by a screw feeder and enters the furnace pot 1c, the material will fall onto the material receiving plate 31, avoiding the disadvantages that the material directly falls to the inner bottom of the furnace pot 1c and aggregates, resulting in a large material thickness and unable to achieve even heating. After falling into the material receiving cavity 301 on the material receiving plate 31, the relatively thick-aggregated material is dispersed from its side with the rotation of the material stirring plate 3 to obtain a more even heating effect.

[0067] In order to enable the material falling onto the material receiving plate 31 to be transferred to the material stirring plate 3 and be dispersed by the rotation of the material stirring plate 3, as Figure 6As shown, the material receiving plate 31 faces radially towards the inner wall of the furnace pot 1c and together with the material stirring plate 3 forms a first slope a. After the material falls onto the material receiving plate 31 through the screw feeder, it slides along the first slope a and by its own gravity and is transferred to the material stirring plate 3, and then can be dispersed as the material stirring plate 3 rotates.

[0068] In order to enable the material falling onto the material stirring plate 3 to be laid flat along its length and evenly dispersed and dropped during rotation for heating, as Figure 4 shown, the material stirring plate 3 forms a second slope b from the feeding port direction of the furnace pot 1c towards the discharging port direction. After the above-mentioned material slides from the material receiving plate 31 to one side of the material stirring plate 3, it slides along the second slope b towards the other side of the material stirring plate 3 to achieve flattening, reducing the agglomeration thickness of the material. During the rotation of the material stirring plate 3, it can be separated from the material stirring plate 3 along the entire side length of the entire material stirring plate 3, further improving the flattening (reducing the agglomeration thickness) and dispersion effect of the material by the material stirring plate 3.

[0069] Since it takes a certain amount of time for the material to slide from one side of the material stirring plate 3 close to the material receiving plate 31 to the other side of the material stirring plate 3, and the material on the material stirring plate 3 will synchronously slide down into the inner cavity of the furnace pot 1c and separate from the material stirring plate 3 as the rotation angle of the material stirring plate 3 increases, there is a drawback that the material will slide and separate from the material stirring plate 3 before it has slid from one side of the material stirring plate 3 to the other side and the material has not been fully flattened. Therefore, preferably, the entire material stirring plate 3 is a torsion structure, and the outer side edge of the side close to the discharging port of the furnace pot 1c is higher than the inner side edge connected to the furnace pot. That is, the sliding and separation of the material on it are restricted by the side height of the material stirring plate 3. The direction of the material sliding on the material stirring plate 3 is as Figure 6 shown by the arrow c in the figure, so that the material on the side close to the discharging port of the furnace pot 1c (it takes a certain amount of time for the material to slide into this side) will gradually approach the inner wall of the furnace pot 1c during sliding, and gradually increase the distance between the material and the side edge of the material stirring plate 3, so as to enable the material to fully slide and be laid flat on the entire material stirring plate 3, so that the material can be separated, dispersed and evenly heated along its entire side edge.

[0070] To further improve the full dispersion and heating duration of the material, as Figure 7 shown, each material stirring plate 3 is a mesh structure. During the sliding process of the material on the material stirring plate 3, the material can be quickly dispersed and dropped through the mesh structure and fall into the inner cavity of the furnace pot 1c for heating, reducing the excessive blockage of the surface of the material stirring plate 3 to the heating of the material, so as to shorten the heating duration of the material.

[0071] After the material detaches from the side of the material stirring plate 3, it is in a suspended state of falling and being heated. To further disperse the material when it detaches from the side of the material stirring plate 3, preferably, as Figure 6 shown, several material dispersion teeth are provided at the inner edge of the stirring plate on the inner side of the center of the furnace pot. When the material stirring plate 3 rotates and the material slides to the side of the material stirring plate 3, the material contacts with the dispersion teeth, which can further achieve the dispersion effect of the falling material, avoiding the drawback that the whole material aggregated on the material stirring plate 3 detaches from the side of the material stirring plate 3 and cannot achieve good dispersion and heating.

[0072] The principle of the present invention is that the drum gas furnace is mainly applicable to the heating treatments such as drying, roasting, coating and granulating of battery graphite materials. By adding combustion burners to each furnace pot, the rapid temperature rise of the furnace body can be achieved, which is helpful for achieving good drying effect on materials such as battery graphite, and solving the problems of slow heating rate, high energy consumption and being not conducive to the rapid temperature rise and forming of materials existing in the current furnace body heating with electric heating wires. Through the intelligent control of the furnace body, precise control can be achieved in terms of the adaptability of temperature rise rate, heating temperature, heating time, cooling and safety control and other aspects for the characteristics of the material. Furthermore, on the basis of reducing energy consumption by gas heating, the intelligence of the furnace body is improved, which is helpful for the adaptable heating and convenient adjustment of parameters according to different material characteristics.

[0073] When the material is conveyed to the feed port of the furnace pot 1c of the low-temperature section furnace body 11 through the screw feeder and enters the furnace pot 1c to be heated, the material will first be on the material holding plate 31 and slide along the first slope a to one side of the material stirring plate 3, and then slide along the second slope b towards the other side of the material stirring plate 3 to achieve paving, reducing the aggregation thickness of the material. The sliding direction of the material on the material stirring plate 3 is as Figure 6 shown by the arrow c in the figure, so that the material on the side close to the discharge port of the furnace pot 1c (it takes a certain time for the material to slide into this side) will gradually approach the inner wall of the furnace pot 1c when sliding, and gradually increase the distance between the material and the side of the material stirring plate 3, so as to enable the material to fully slide and pave on the entire material stirring plate 3, enabling the material to detach, disperse and be evenly heated along its entire side, so as to ultimately reduce the energy consumption of the furnace body and improve the heating quality of the material.

[0074] The above shows and describes the basic principle, main features and advantages of the present invention. Without departing from the spirit and scope of the present invention, the present invention will have various changes and improvements, and these changes and improvements all fall within the scope of the present invention claimed.

Claims

1. A gas-fired multi-stage continuous drum furnace, characterized in that: It successively includes a low-temperature section furnace body (11) and a high-temperature section furnace body (12) that are interconnected. The drum furnace (1) further includes accessories connected to the furnace body. Each furnace body is composed of a furnace shell (1a), a furnace lining (1b), and a furnace pot (1c). A gas heating component and a material dispersion component are provided in each furnace pot (1c); The material dispersion component is that material stirring plates (3) are circumferentially spaced along the inner wall in each furnace pot (1c), and the width of each material stirring plate (3) is less than the radius of the furnace pot (1c); At the feeding port of each furnace pot (1c), a material receiving plate (31) extends radially towards the center of the furnace pot (1c) on each material stirring plate (3), and a material blocking plate (32) is vertically arranged on the outer side of the material receiving plate (31). The material blocking plate (32) and the side wall of the furnace pot (1c) form a material receiving cavity (301); The material receiving plate (31) extends radially towards the inner wall of the furnace pot (1c) and together with the material stirring plate (3) forms a first slope (a); The material stirring plate (3) forms a second slope (b) from the feeding port direction of the furnace pot (1c) towards the discharging port direction; The material stirring plate (3) is an overall torsion structure, and the outer side edge of the side close to the discharging port of the furnace pot (1c) is higher than the inner side edge connected to the furnace pot (1c).

2. A gas-fired multi-stage continuous roller furnace according to claim 1, characterized in that: Each material stirring plate (3) is a mesh structure.

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