A device for drying and forming of biochar

Abstract

This utility model proposes an integrated device for drying and molding biochar, relating to the field of biochar preparation technology. This application uses a dual heating method to melt straw charcoal raw materials and effectively absorbs, dehumidifies, and purifies the lost heat during the heating process to achieve recycling, thereby achieving better drying effect. At the same time, the moisture content of the raw materials can be automatically detected in real time during the melting process to avoid lag (i.e., reduce the probability of over-drying or under-drying). The continuous drying-molding operation shortens the single production cycle from 4-6 hours in the traditional process to 1-2 hours, and the overall production efficiency of the equipment is increased by more than 50%.

Description

Technical Field

[0001] This utility model relates to the field of biochar preparation technology, and more specifically, to an integrated device for drying and shaping biochar. Background Technology

[0002] Biochar, a carbon-rich solid material produced by the pyrolysis of biomass under anaerobic or limited oxygen conditions, has significant application value in agriculture, environmental protection, and energy fields due to its excellent adsorption properties, stability, and carbon sequestration capacity. Among these processes, drying and molding are the core steps that determine the mechanical strength, storage stability, and application effectiveness of biochar products.

[0003] Currently, the form of carbonized straw after storage varies (i.e., it exists in block, powder, and granular forms simultaneously), necessitating a drying and molding process. The existing drying and molding process consists of two separate steps: drying involves heating the straw to melt it, and molding involves transferring the molten material to a twin-screw granulator for granulation to achieve a more uniform shape. This process suffers from the following problems and lacks an integrated design for drying and molding biochar: 1. Currently, most straw heating and melting processes use a single heating method. In addition, the heat generated during traditional drying processes is directly lost to the external environment, lacking a design for heat recovery and reuse. 2. Parameter control lag: The moisture content of the molten material needs to be manually sampled and tested. There is a lag of 2-4 hours from sampling to adjusting the equipment parameters, which often results in "over-drying" or "under-drying" phenomena. Over-drying leads to increased brittleness of biochar, and the compressive strength of the granules after molding is less than 1.5MPa. Under-drying easily causes the material to stick to the mold, increasing the frequency of machine shutdown for cleaning. The announcement number CN201920693372.5 proposes an efficient biochar preparation device. Although the conical carbonization furnace in the device achieves continuous carbonization, it does not involve the drying-forming synergistic process.

[0004] The announcement number CN202221765037.X proposes a separation and sand removal device for biochar production and processing. This device can not only separate impurities such as sand and soil and retain smaller biochar, but also separate larger and smaller biochar. However, it lacks the function of real-time detection of moisture content.

[0005] In summary, the drying and shaping process in the current biochar preparation process has the aforementioned problems that urgently need to be solved. Utility Model Content

[0006] The purpose of this invention is to solve the problems mentioned in the background art and to propose an integrated device for drying and molding biochar.

[0007] The technical solution adopted by this utility model to solve its technical problem is: An integrated device for drying and shaping biochar includes a material storage and transfer assembly. An inclined conveying pipe connects to a storage and transfer assembly fixed to the base; An open mounting cylinder is horizontally fixed on the base and located on one side of the material storage and transfer assembly; The first sleeve and the second sleeve are respectively installed inside the mounting cylinder and are coaxial with the mounting cylinder. A first mounting cavity is formed between the mounting cylinder and the first sleeve, and a second mounting cavity is formed between the first sleeve and the second sleeve. The end of the delivery pipe is connected to the inside of the second sleeve. The screw conveyor assembly is mounted on the mounting cylinder and located inside the second sleeve. The gas burner is embedded in the inner wall of the second sleeve; The electric heating element is installed on the screw conveyor assembly; The hot air circulation and utilization components are respectively installed in the first installation cavity and the second installation cavity, and the end of the hot air circulation and utilization component is connected to the inside of the second sleeve. The end of the hot air circulation and utilization component, the spiral conveying component and the conveying pipe are distributed at intervals. One end of the pipe is connected to the sealing end of the installation cylinder; The moisture content testing element is embedded in the inner wall of the second sleeve and is spaced apart from the gas burner; The feed hopper of the twin-screw granulator is connected to the other end of the pipeline.

[0008] Furthermore, the material transfer assembly includes a storage bin, a vibrating motor, and a screw conveyor. The storage silo is fixed on the base, and the storage silo is equipped with a vibrating motor, a feeding hopper and a discharge pipe, and the discharge pipe is equipped with a valve; The feed hopper of the screw conveyor is connected to the discharge pipe, and the discharge hopper of the screw conveyor is connected to the conveying pipe.

[0009] Furthermore, a drawer-type automatic electromagnetic separator is installed between the discharge pipe and the feed hopper of the screw conveyor.

[0010] Furthermore, the screw conveyor assembly includes a drive motor and a screw rod. The drive motor is fixed on the mounting cylinder and is connected to a spiral rod that is located inside the second sleeve and extends along the axis of the second sleeve. Several electric heating tubes are provided on the spiral blades of the spiral rod.

[0011] Furthermore, the hot air circulation assembly includes a centrifugal circulating fan, a suction hood, a condenser dehumidifier, an air filter, and a circulation pipe. The centrifugal circulating fan and the condenser dehumidifier are both installed in the second mounting cavity; The suction hood located outside the mounting cylinder is connected to the input end of the centrifugal circulating fan, and the output end of the centrifugal circulating fan is connected to the input end of the condenser dehumidifier. The input of the air filter is connected to the output of the condenser dehumidifier; One end of the circulation pipe is connected to the output end of the air filter, and the other end of the circulation pipe is connected to the inside of the second set of pipes and is distributed at intervals with the drive motor and the delivery pipe.

[0012] Furthermore, the moisture content detection device employs a high-frequency moisture sensor.

[0013] Furthermore, three independently operating electromagnetic coils are sequentially installed along the length of the twin-screw granulator, and an independently operating infrared temperature probe is installed at the gap between each electromagnetic coil.

[0014] Compared with the prior art, the beneficial effects of this utility model are: 1. This application uses a dual heating method to melt straw charcoal raw materials and effectively absorbs, dehumidifies, and purifies the lost heat during the heating process to achieve recycling, thereby achieving better drying effect. At the same time, the moisture content of the raw materials can be automatically detected in real time during the melting process to avoid lag (i.e., reduce the probability of over-drying or under-drying). Through online moisture monitoring and control, the moisture content of biochar is controlled within ±1%, the compressive strength of the formed particles is stable at 2.5-4.0MPa, and the breakage rate is reduced to below 3%, which is far better than the 10% breakage rate level of traditional processes. 2. Significantly improved production efficiency: The continuous drying-forming operation shortens the single production cycle from 4-6 hours in the traditional process to 1-2 hours, and the overall production efficiency of the equipment is increased by more than 50%; at the same time, it reduces manual operation links, and a single machine can reduce the number of operators by 2-3 people. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the overall structure of this utility model; Figure 2 for Figure 1 Enlarged view of section A (labeled A); Figure 3 for Figure 1 Enlarged view of section B (reference number B); Figure label: 1. Material transfer assembly; 101. Material silo; 102. Vibrating motor; 103. Screw conveyor; 2. Conveying pipe; 3. Mounting cylinder; 4. First sleeve; 5. Second sleeve; 6. Screw conveyor assembly; 61. Drive motor; 62. Screw rod; 7. Gas burner; 8. Electric heating element; 9. Hot air circulation assembly; 901. Centrifugal circulating fan; 902. Suction hood; 903. Condensation dehumidifier; 904. Air filter; 905. Circulation pipe; 10. Pipeline; 11. Moisture content detection device; 12. Twin-screw granulator; 13. Electromagnetic coil. Detailed Implementation

[0016] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present utility model, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the scope of protection of the present utility model. The present utility model will be further described with reference to the accompanying drawings and embodiments: like Figures 1 to 3 As shown, an integrated device for drying and molding biochar includes a material storage and transfer assembly 1, a conveying pipe 2, an installation cylinder 3, a first sleeve 4, a second sleeve 5, a screw conveyor assembly 6, a gas burner 7 (which is existing technology and will not be improved), an electric heating tube 8 (which is existing technology and will not be improved), a hot air circulation assembly 9, a pipeline 10, a moisture content detection device, and a twin-screw granulator 12 (which is existing technology and will not be improved). Working principle of a twin-screw granulator Material handling process The material enters through the feed port and forms a viscous flow state under the shearing, compression, and stirring action of the rotating screw; As the material passes through the mixing section, the temperature and pressure gradually increase, eventually forming the final product through the die head.

[0017] The inclined conveying pipe 2 connects to the material storage and transfer assembly 1 fixed on the base; Specifically, the installation cylinder 3, which is open at one end, is horizontally fixed on the base and located on one side of the material storage and transfer assembly 1; The first sleeve 4 and the second sleeve 5 are respectively disposed inside the mounting cylinder 3 and are coaxial with the mounting cylinder 3. A first mounting cavity is formed between the mounting cylinder 3 and the first sleeve 4, and a second mounting cavity is formed between the first sleeve 4 and the second sleeve 5. The end of the conveying pipe 2 is connected to the inside of the second sleeve 5. The screw conveyor assembly 6 is mounted on the mounting cylinder 3 and located inside the second sleeve 5; The gas burner 7 is embedded in the inner wall of the second sleeve 5; The electric heating element 8 is installed on the screw conveyor assembly 6; The hot air circulation and utilization component 9 is respectively installed in the first installation cavity and the second installation cavity, and the end of the hot air circulation and utilization component 9 is connected to the inside of the second sleeve 5. The end of the hot air circulation and utilization component 9, the spiral conveying component 6 and the conveying pipe 2 are distributed at intervals. One end of pipe 10 is connected to the sealing end of installation cylinder 3; The moisture content detection element 11 is embedded in the inner wall of the second sleeve 5 and is distributed at intervals with the gas burner 7. (The moisture content detection element 11 specifically adopts a high-frequency moisture sensor. The high-frequency moisture sensor is an existing technology and will not be improved. The sensor probe of the high-frequency moisture sensor is made of tantalum electrode material and is embedded in the inner wall of the drying unit pipe. The probe surface is flush with the inner wall of the pipe to avoid material retention and accumulation.) The feed hopper of the twin-screw granulator 12 is connected to the other end of the pipe 10.

[0018] The structure of the gas burner 7 consists of: 1. Gas supply system Includes gas distribution pipe bundles, nozzles, and solenoid valves, responsible for gas delivery and flow control; It adopts a staged air supply design, achieving premixing of fuel gas and air through a ring-shaped nozzle or a dual-air-duct makeup air system; 2. Combustion System Burner / Stove Head: The burner ejector channel faces the second opening to optimize flame distribution; Mixing chamber: The frame and mating parts enclose a cavity to accommodate air, and the side frame plate is provided with air inlets to adjust the air ratio; 3. Ignition device An independent electronic ignition system, integrating pulse ignition or piezoelectric ceramic technology, ensures a high success rate.

[0019] Key advantages: The heating and drying unit in this application adopts a three-layer concentric nested structure. The outer layer is a 50mm thick aluminum silicate insulation layer (thermal conductivity ≤0.03W / (m・K)), the middle layer is a heating chamber, and the inner layer is a material stirring chamber. The overall length is 3-6m and the diameter is 0.8-1.5m.

[0020] The heating chamber is equipped with a dual-energy heating system: the main heating uses a gas burner 7 (heat load 30-120kW), and the auxiliary heating uses an electric heating tube 8 (total power 15-45kW). The gas flow is adjusted by a proportional valve to achieve stepless control of hot air temperature from 50-150℃, with a temperature control accuracy of ±2℃.

[0021] The mixing chamber is equipped with a spiral stirring component, causing the material to form a thin layer of 1-3mm that tumbles, increasing the hot air contact area by more than 60% compared to traditional equipment. The stirring shaft speed is adjusted via a variable frequency motor (10-30 rpm) to match the drying requirements of raw materials with different moisture contents.

[0022] Specific implementation of this utility model solution, such as Figure 1 As shown, the material transfer assembly 1 includes a storage bin 101, a vibrating motor 102, and a screw conveyor 103. The storage bin 101 is fixed on the base, and the storage bin 101 is equipped with a vibrating motor 102, a feed hopper and a discharge pipe. The discharge pipe is equipped with a valve (the feed hopper, discharge pipe and valve are shown in the figure but are not labeled). The feed hopper of the screw conveyor 103 is connected to the discharge pipe, and the discharge hopper of the screw conveyor 103 is connected to the conveying pipe 2.

[0023] In order to effectively remove metal impurities such as iron filings and nails mixed in the raw materials and avoid subsequent equipment wear, the above embodiment is further optimized by installing a drawer-type automatic electromagnetic separator between the discharge pipe and the feed hopper of the screw conveyor 103 (the drawer-type automatic electromagnetic separator is existing technology and is not shown in the figure).

[0024] The structure of a drawer-type automatic electromagnetic separator: 1. Magnetic Source System Neodymium iron boron magnets or electromagnetic coils are used as the magnetic source, with the magnets arranged in a double-layered, staggered pattern inside the drawer to enhance the adsorption effect; The electromagnetic design utilizes a fully sealed structure formed by casting with electrical-grade resin, resulting in a deep magnetic permeability and dust and rain protection. 2. Drawer-type collection device Includes sliding rails, a housing, and a retractable magnetic grille. The magnetic grille consists of a connecting frame and multiple magnetic rods for easy maintenance and cleaning. The inlet and outlet are connected by flanges, suitable for conveying powdery or lumpy materials; 3. Auxiliary and Control Systems Self-unloading mechanism The electromagnetic self-unloading design uses a sprocket and chain to drive a scraper belt, automatically removing adsorbed iron impurities. Equipped with a speed reducer power system, it enables timed or continuous discharge of iron filings.

[0025] Specific implementation of this utility model solution, such as Figure 1 As shown, the screw conveyor assembly 6 includes a drive motor 61 and a screw rod 62. The drive motor 61 is fixed on the mounting cylinder 3, and the drive motor 61 is connected to a spiral rod 62 located inside the second sleeve 5 and extending along the axial direction of the second sleeve 5. Several electric heating tubes 8 are provided on the spiral blades of the spiral rod 62.

[0026] Specific implementation of this utility model solution, such as Figure 1 As shown, the hot air circulation assembly 9 includes a centrifugal circulating fan 901 (existing technology and no improvement is made), a suction hood 902, a condenser dehumidifier 903 (existing technology and no improvement is made), an air filter 904 (existing technology and no improvement is made), and a circulation pipe 905. Both the centrifugal circulating fan 901 and the condenser dehumidifier 903 are installed in the second mounting cavity; The suction hood 902 located outside the mounting cylinder 3 is connected to the input end of the centrifugal circulating fan 901, and the output end of the centrifugal circulating fan 901 is connected to the input end of the condenser dehumidifier 903. The input of air filter 904 is connected to the output of condenser dehumidifier 903; One end of the circulation pipe 905 is connected to the output end of the air filter 904, and the other end of the circulation pipe 905 is connected to the inside of the second sleeve 5 and is distributed at intervals with the drive motor 61 and the delivery pipe 2.

[0027] (I) Structural components of centrifugal circulating fan 901: 1. Impeller System As a core component, the impeller consists of an arc-shaped front plate, a flat rear plate, and airfoil blades, which generate centrifugal force through high-speed rotation.

[0028] The bidirectional air intake design optimizes airflow circulation efficiency.

[0029] 2. Housing and air duct The volute-type casing converts the kinetic energy of the gas into pressure energy, and the one-piece or three-part design facilitates maintenance. Enclosed air ducts reduce energy loss and are suitable for circulating operating conditions.

[0030] 3. Transmission components The spindle is made of high-quality steel and is connected to the motor via a coupling or pulley.

[0031] 4. Control and Safety The air inlet adopts a conical arc design to reduce airflow loss; The filter screen prevents foreign objects from entering the impeller.

[0032] (II) Structural components of the condenser dehumidifier 903: 1. Refrigeration cycle system Compressor: Utilizing either a scroll or piston design, it is responsible for the compression and circulation of the refrigerant; Two-component assembly: Evaporator: Uses low-temperature copper tubes to condense humid air into water. Condenser: Reheats the dry air before discharging it; Throttling device: capillary tube or expansion valve, used to regulate refrigerant flow; 2. Air circulation system Fan: Forces airflow through the evaporator and condenser; Airflow design: The airflow direction is "evaporator → condenser → air outlet" to ensure efficient dehumidification.

[0033] (III) Structural components of air filter 904: 1. Shell Structure Made of cast iron, stainless steel or plastic, it is designed with upper and lower chambers or front and rear chambers to adapt to different media (gas / liquid) and pressure requirements.

[0034] At the same time, rubber sealing rings ensure that unfiltered air will not leak.

[0035] 2. Filter element The main filter element typically uses composite fiber filter paper or metal wire mesh, resulting in high filtration accuracy.

[0036] 3. Pre-filtration device Desert-type pre-filters utilize swirl blades to generate centrifugal force, resulting in high pre-filtration efficiency. Compressed air filters use deflector plates to rotate the airflow and separate particulate matter.

[0037] 4. Sewage / Backwashing System Differential pressure control automatically initiates backwashing, restoring filtration efficiency through air washing and water washing; The bottom drain pipe removes accumulated impurities.

[0038] To further improve the molding effect, the above embodiment is further optimized by installing three independently operating electromagnetic coils 13 along the length of the twin-screw granulator 12. An independently operating infrared temperature probe is installed at the gap of each electromagnetic coil 13. The infrared temperature probe is not shown in the figure. The system for controlling three electromagnetic coils 13 to achieve different temperature adjustments mainly consists of the following structure, and its working principle is based on electromagnetic induction heating and closed-loop control technology. 1. Core heating unit Segmented electromagnetic coil 13: It consists of three independent copper windings, each of which can be switched on and off independently. The power range is usually 1-5kW / group. 2. Temperature Control System Infrared temperature probe: An independent and non-contact infrared temperature probe is installed at the gap of each section of electromagnetic coil 13, with a detection accuracy of ±1℃; Solid-state relays: Response time <10ms, enabling rapid on / off control of the coil; 3. Power Module Variable frequency power supply: converts 50Hz industrial frequency electricity into 20-40kHz high frequency current.

[0039] It should be noted that the power sources of the vibration motor 102, the screw conveyor 103, the drive motor 61, the gas burner 7, the electric heating tube 8, the centrifugal circulating fan 901, the condenser dehumidifier 903, the moisture content detection device 11, the electromagnetic coil 13, and the twin-screw granulator 12 are all electrically connected to the PLC controller, which is shown in the figure without a label.

[0040] The working process of this utility model is as follows: The initial straw charcoal raw material is fed into the storage bin 101 by a loader. After feeding is completed, the valve on the discharge pipe is opened. At the same time, the PLC controller controls the vibration motor 102 to operate and start discharging, which can significantly reduce the probability of raw material blockage during subsequent discharge. Then, the raw material first passes through a drawer-type automatic electromagnetic iron remover to remove mixed metal impurities. After removing metal impurities, the raw material is injected into the second sleeve 5 in the installation cylinder 3 through the screw conveyor 103. (1) Drying stage: The initial drying temperature is set and the screw conveyor 6 is not operated so that the material is not conveyed or transferred (the purpose is to avoid raw materials with unqualified moisture content from flowing into the molding unit). At the same time, the material can be fully and effectively melted by electric heating tube 8 and gas burner 7. During the melting process, heat will be lost from the open end of the mounting cylinder 3. At this time, the centrifugal circulating fan 901 is controlled by the PLC controller to draw the lost heat to the condenser dehumidifier 903 for moisture removal. After the humid and hot air is condensed and dehumidified, 85% of the dry and hot air is passed into the air filter 904 for purification, and then finally returned to the heating chamber to achieve the effect of recycling. (2) Moisture monitoring: The high-frequency moisture sensor collects moisture content data every 1-3 seconds. Within the first 30 minutes, the moisture content drops from 32% to 15%, and the data is displayed on the screen of the PLC controller in real time. (3) Intelligent control: When the moisture content is detected to be 12% (higher than the target value of 10%), the PLC controller automatically raises the temperature to the preset value. At this time, the screw conveyor component still does not work. After 5 minutes, the moisture content drops to 10.5%, and the PLC controller maintains the current parameters and continues to run. Finally, the moisture content stabilizes at 9.8%, reaching the target value.

[0041] Forming stage: After the moisture content of the molten material is qualified, the PLC controller controls the operation of the screw conveyor assembly to transport the material through the pipeline into the twin-screw extruder. The three sections of the barrel are set to 60℃, 100℃ and 130℃ respectively, the screw speed is 50 rpm, and the die pressure is stabilized at 18MPa. After the particles are cooled, they can be screened. Particles with qualified particle size after screening enter the finished product warehouse to wait for packaging.

[0042] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The descriptions of the above embodiments and specifications are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of protection claimed by this utility model. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. An integrated device for drying and molding biochar, characterized in that, Includes a material transfer component (1). An inclined conveying pipe (2) connects to a storage and transfer assembly (1) fixed on a base. An open mounting cylinder (3) is horizontally fixed on the base and located on one side of the material transfer assembly (1); The first sleeve (4) and the second sleeve (5) are respectively installed inside the mounting cylinder (3) and are coaxial with the mounting cylinder (3). A first mounting cavity is formed between the mounting cylinder (3) and the first sleeve (4), and a second mounting cavity is formed between the first sleeve (4) and the second sleeve (5). The end of the conveying pipe (2) is connected to the inside of the second sleeve (5). The screw conveyor assembly (6) is mounted on the mounting cylinder (3) and located inside the second sleeve (5); The gas burner (7) is embedded in the inner wall of the second sleeve (5); An electric heating element (8) is mounted on the screw conveyor assembly (6); The hot air circulation assembly (9) is respectively installed in the first mounting cavity and the second mounting cavity, and the end of the hot air circulation assembly (9) is connected to the inside of the second sleeve (5). The end of the hot air circulation assembly (9), the spiral conveying assembly (6) and the conveying pipe (2) are distributed at intervals. One end of the pipe (10) is connected to the sealing end of the installation cylinder (3); The moisture content testing piece (11) is embedded in the inner wall of the second sleeve (5) and is spaced apart from the gas burner (7); The other end of the feed hopper connecting pipe (10) of the twin-screw granulator (12).

2. The integrated device for drying and molding biochar according to claim 1, characterized in that, The material transfer assembly (1) includes a storage bin (101), a vibrating motor (102), and a screw conveyor (103). The storage bin (101) is fixed on the base, and the storage bin (101) is equipped with a vibrating motor (102), a feeding hopper and a discharge pipe, and the discharge pipe is equipped with a valve; The feed hopper of the screw conveyor (103) is connected to the discharge pipe, and the discharge hopper of the screw conveyor (103) is connected to the conveying pipe (2).

3. The integrated device for drying and molding biochar according to claim 2, characterized in that, A drawer-type automatic electromagnetic separator is installed between the discharge pipe and the feed hopper of the screw conveyor (103).

4. The integrated device for drying and molding biochar according to claim 1, characterized in that, The spiral conveying assembly (6) includes a drive motor (61) and a spiral rod (62). The drive motor (61) is fixed on the mounting cylinder (3), and the drive motor (61) is connected to a spiral rod (62) located inside the second sleeve (5) and extending along the axis of the second sleeve (5). Several electric heating tubes (8) are provided on the spiral blades of the spiral rod (62).

5. The integrated device for drying and molding biochar according to claim 4, characterized in that, The hot air circulation assembly (9) includes a centrifugal circulating fan (901), a suction hood (902), a condenser dehumidifier (903), an air filter (904), and a circulation pipe (905). The centrifugal circulating fan (901) and the condenser dehumidifier (903) are both installed in the second mounting cavity; The suction hood (902) located outside the mounting cylinder (3) is connected to the input end of the centrifugal circulating fan (901), and the output end of the centrifugal circulating fan (901) is connected to the input end of the condenser dehumidifier (903); The input of the air filter (904) is connected to the output of the condenser dehumidifier (903); One end of the circulation pipe (905) is connected to the output end of the air filter (904), and the other end of the circulation pipe (905) is connected to the inside of the second sleeve (5) and is spaced apart from the drive motor (61) and the delivery pipe (2).

6. The integrated device for drying and molding biochar according to claim 1, characterized in that, The moisture content detection device (11) uses a high-frequency moisture sensor.

7. The integrated device for drying and molding biochar according to claim 1, characterized in that, Three independently operating electromagnetic coils (13) are sequentially mounted along the length of the twin-screw granulator (12), and an independently operating infrared temperature probe is installed at the gap of each electromagnetic coil (13).

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