A continuous pyrolysis device of biomass with combustion gas back-firing and self-heating

Abstract

The utility model belongs to the field of biomass energy conversion processing technology provides a kind of combustion backfiring self-heating type biomass continuous pyrolysis device, including material lifting module, blanking module, pyrolysis module, combustion module, heat preservation module, discharge cooling module, recovery module, spraying module and water circulation module. Its adoption smoke backflow spiral heat exchange structure can be the flue gas generated by combustion module is passed to the chimney piece place through smoke exhaust channel and is discharged, so that the heat transfer temperature difference of pyrolysis cylinder in axial is more balanced, avoids the "front end temperature is insufficient, rear end temperature is too high" problem caused by traditional downflow heating, guarantees that material can obtain stable, sustained heat supply on entire reaction path.

Description

Technical Field

[0001] This utility model belongs to the field of biomass energy processing technology, specifically relating to a gas-fired self-heating biomass continuous pyrolysis device. Background Technology

[0002] Biomass pyrolysis technology, as an important approach to the resource utilization of solid waste, has been widely researched and applied. However, existing industrial continuous pyrolysis plants still generally suffer from the following key technological bottlenecks in actual operation, which seriously restrict their economic efficiency and reliability: The contradiction between energy consumption and self-heating balance is prominent. Theoretically, the combustible volatiles (pyrolysis fuel gas) produced during biomass pyrolysis contain enough energy to sustain the entire reaction. However, traditional pyrolysis units generally suffer from low fuel gas utilization efficiency in actual operation, resulting in the need for substantial external energy supplementation. According to test data from industrial units, the large fluctuation range of the calorific value of the pyrolysis fuel gas (4500-5000 kJ / m³) is one of the core factors affecting backfire stability. The tar content in the fuel gas generally exceeds the standard (several times higher than the national standard), making it prone to coking, blockage, and incomplete combustion during combustion, severely affecting the system's thermal efficiency. Although some equipment attempts to guide the fuel gas back into the combustion chamber, the lack of efficient mixing and stable combustion design often leads to backfire or flameout accidents, causing system operation interruptions and safety risks.

[0003] There is a significant difference in fuel utilization efficiency between externally heated and internally heated pyrolysis systems. Studies have shown that while externally heated pyrolysis systems (indirectly heated via high-temperature gas or heating wires) offer the advantage of precise temperature control (±5℃), their thermal efficiency is generally below 40%, far lower than the over 60% of internally heated systems (direct contact heat exchange). This difference mainly stems from the energy transfer methods of the two technologies: internally heated systems use solid heat carriers (such as ceramic balls or semi-coke) or gaseous heat carriers (hot flue gas) to directly contact and exchange heat with biomass, significantly reducing heat loss; while externally heated systems require indirect heat transfer through metal walls, and their heat transfer efficiency is limited by the material's thermal conductivity and the interface temperature difference.

[0004] The challenges of continuous and stable operation are significant. Continuity is fundamental to industrial production, but in biomass pyrolysis, it is primarily limited by the feeding and conveying processes. At the feeding end, traditional central-shaft screw feeders are prone to material entanglement and bridging in low-density (bulk density often below 200 kg / m³) and high-fiber loose biomass such as rice husks and straw. Furthermore, the sealing performance of the feed inlet is crucial for maintaining an oxygen-free environment within the furnace (requiring oxygen content typically below 1%). Research from the State Key Laboratory of Coal Combustion at Huazhong University of Science and Technology indicates that even trace amounts of oxygen can cause non-selective oxidation of high-temperature pyrolysis products, leading to a significant decrease in bio-oil yield and an increase in its acid value, severely impacting product quality. During conveying, when materials remain at high temperatures of 500-600°C, uneven pyrolysis or the presence of localized hot spots within the furnace can easily cause hard coke to form on the conveying screw or furnace wall, increasing the motor load and, in severe cases, even causing the screw to jam.

[0005] Cooling Challenges and Safety Hazards in High-Temperature Biochar Production. Biochar produced from biomass pyrolysis reaches temperatures as high as 400-600°C upon discharge. Its porous structure gives it a large specific surface area and extremely high chemical reactivity. Research from the School of Energy and Environment at Southeast University, using thermogravimetric analysis (TGA), revealed that the auto-ignition point (AIT) of fresh biochar can be as low as 180-220°C. Upon contact with air, it rapidly undergoes exothermic oxidation, and spontaneous combustion occurs when the rate of heat accumulation exceeds the rate of heat dissipation. Achieving rapid, uniform, and timely cooling of high-temperature biochar in an oxygen-free environment is one of the bottlenecks ensuring safe production and product quality. Traditional cooling methods, such as long-distance sealed spiral cooling conveyors, typically have a cooling rate of only 10-20°C / minute. This means that cooling char from 500°C to a safe temperature takes more than 20 minutes, and the equipment is exceptionally bulky. Therefore, developing an instantaneous and efficient cooling technology capable of achieving cooling rates on the order of tens of degrees per second (10°C / s) is a pressing technical challenge in this field. Utility Model Content

[0006] In order to overcome the above-mentioned shortcomings of the prior art, the purpose of this utility model is to provide a gas-fired self-heating biomass continuous pyrolysis device.

[0007] The technical solution adopted by this utility model to solve its technical problem is: A gas-fired self-heating biomass continuous pyrolysis device includes a feeding module, a discharging module, a pyrolysis module, a combustion module, a heat preservation module, a discharge cooling module, a recovery module, a spraying module, and a water circulation module. The two ends of the feeding module are respectively connected to the feeding module and the pyrolysis module. The pyrolysis module is respectively connected to the combustion module and the heat preservation module. The heat preservation module is connected to the recovery module through the discharge cooling module. The spray module is located above the recovery module, and the water circulation module is located below the recovery module. The spray module is connected to the water circulation module. The pyrolysis module includes a pyrolysis furnace, a pyrolysis cylinder, a first drive motor, a pyrolysis spiral component, a chimney component, and spiral guide fins. The chimney component is connected to the pyrolysis furnace. The pyrolysis cylinder is arranged along the length of the pyrolysis furnace and passes through it. The pyrolysis spiral component is located inside the pyrolysis cylinder. The drive end of the first drive motor is connected to one end of the pyrolysis spiral component. One end of the pyrolysis cylinder is connected to the insulation module. The spiral guide fins are disposed on the outer wall surface of the pyrolysis cylinder. The spiral guide fins, the pyrolysis cylinder, and the pyrolysis furnace form a flue gas passage. One end of the flue gas passage faces the chimney component.

[0008] Preferably, the heat preservation module includes a heat preservation charcoal box, a horizontal rotating grid, a second drive motor, and a reverse injection pipe. The horizontal rotating grid is disposed inside the heat preservation charcoal box. The drive end of the second drive motor is connected to the horizontal rotating grid. One end of the reverse injection pipe is connected to the top of the heat preservation charcoal box, and the other end is connected to the combustion module.

[0009] Preferably, the discharge cooling module includes a spiral tube, a third drive motor, and a cooling guide tube. The drive end of the third drive motor is connected to the spiral tube. One end of the spiral tube is located inside the heat-insulating carbon box and below the horizontal rotating grid. The other end of the spiral tube is connected to the cooling guide tube, and the cooling guide tube is connected to the recycling module.

[0010] Preferably, the combustion module includes a fuel burner and a combustion chamber, the combustion end of the fuel burner is located in the combustion chamber, the top of the combustion chamber is connected to the pyrolysis furnace, and the other end of the reverse injection pipe is located in the combustion chamber and is inclined to the combustion end of the fuel burner.

[0011] Preferably, the spray module includes a cooling pipe, an atomizing pipe, a nozzle, a water supply tank, and a filter box. The atomizing pipe and the nozzle are connected to the water supply tank through the cooling pipe. The filter box is located inside the water circulation module, and the nozzle and the atomizing pipe are located above the recovery module. The water circulation module includes a water tank and a return water pipe. The water tank is located below the recycling module, and the return water pipe is connected to the water tank and the filter box respectively.

[0012] Preferably, there are two atomizing tubes arranged in parallel, and the nozzle is located between the two atomizing tubes.

[0013] Preferably, the feeding module includes a hopper and a sealing valve, the sealing valve being located inside the hopper, and the hopper having a window.

[0014] Preferably, the pyrolysis furnace is equipped with an explosion-proof safety valve.

[0015] Preferably, the material lifting module includes a material lifting hopper and a screw conveyor.

[0016] Preferably, a temperature sensor is provided at the recycling module.

[0017] Compared with the prior art, the beneficial effects of this utility model include: The gas-fired self-heating biomass continuous pyrolysis device of this application adopts a flue gas counter-current spiral heat exchange structure, which can lead the flue gas generated by the combustion module to the chimney through the exhaust channel and discharge it, making the heat transfer temperature difference in the axial direction of the pyrolysis cylinder more uniform. This avoids the problem of "insufficient front-end temperature and excessively high rear-end temperature" caused by traditional co-current heating, and ensures that the material can obtain a stable and continuous heat supply throughout the entire reaction path. Attached Figure Description

[0018] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of the structure of this utility model.

[0020] Figure 2 This is a simplified structural diagram of the spray module of this utility model.

[0021] in: 1-Screw conveyor, 2-First drive motor, 3-Window, 4-Sealing valve, 5-Hopper, 6-Pyrolysis screw component, 7-Chimney component, 8-Pyrolysis cylinder, 9-Explosion-proof safety valve, 10-Screw guide fins, 11-Pyrolysis furnace, 12-Fuel burner, 13-Combustion chamber, 14-Insulated charcoal box, 15-Horizontal rotating grid, 16-Water tank, 17-Filter box, 18-Screw tube, 19-Water pump, 20-Water supply tank, 21-Temperature sensor, 22-Atomizing tube, 23-Cooling tube, 24-Return water tube, 25-Nozzle. Detailed Implementation

[0022] To better understand the above-mentioned objectives, features, and advantages of this utility model, it will be described in detail below with reference to the accompanying drawings and specific embodiments. It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. Many specific details are set forth in the following description to provide a thorough understanding of this utility model; the described embodiments are merely some, not all, of the embodiments of this utility model. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without inventive effort are within the scope of protection of this utility model.

[0023] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.

[0024] Example: like Figure 1-2 As shown, this embodiment provides a gas-fired self-heating biomass continuous pyrolysis device, including a feeding module, a discharging module, a pyrolysis module, a combustion module, a heat preservation module, a discharge cooling module, a recovery module, a spraying module, and a water circulation module; The two ends of the feeding module are connected to the feeding module and the pyrolysis module respectively. The pyrolysis module is connected to the combustion module and the heat preservation module respectively. The heat preservation module is connected to the recovery module through the discharge cooling module. The spray module is located above the recovery module, and the water circulation module is located below the recovery module. The spray module is connected to the water circulation module. The pyrolysis module includes a pyrolysis furnace 11, a pyrolysis cylinder 8, a first drive motor 2, a pyrolysis spiral component 6, a chimney component 7, and spiral guide fins 10. The chimney component 7 is connected to the pyrolysis furnace 11. The pyrolysis cylinder 8 is arranged along the length of the pyrolysis furnace 11 and passes through the pyrolysis furnace 11. The pyrolysis spiral component 6 is located inside the pyrolysis cylinder 8. The drive end of the first drive motor 2 is connected to one end of the pyrolysis spiral component 6. One end of the pyrolysis cylinder 8 is connected to the heat preservation module. The spiral guide fins 10 are arranged on the outer wall of the pyrolysis cylinder 8. The spiral guide fins 10 form a flue gas passage between the pyrolysis cylinder 8 and the pyrolysis furnace 11. One end of the flue gas passage faces the chimney component 7.

[0025] The gas-fired self-heating biomass continuous pyrolysis device of this embodiment adopts a flue gas counter-current spiral heat exchange structure, which can lead the flue gas generated by the combustion module to the chimney component 7 through the flue gas exhaust channel and discharge it. This ensures that the flue gas has undergone the most sufficient heat exchange with the pyrolysis cylinder 8 before discharge, which greatly improves the energy utilization efficiency and makes the heat transfer temperature difference of the pyrolysis cylinder 8 more balanced in the axial direction. This avoids the problem of "insufficient front-end temperature and excessive rear-end temperature" caused by traditional co-current heating, and ensures that the material can obtain a stable and continuous heat supply throughout the entire reaction path.

[0026] The specific structure of the insulation module in this embodiment is as follows: It includes an insulated charcoal box 14, a horizontal rotating grille 15, a second drive motor, and a reverse injection pipe. The horizontal rotating grille 15 is located inside the insulated charcoal box 14. The drive end of the second drive motor is connected to the horizontal rotating grille 15. One end of the reverse injection pipe is connected to the top of the insulated charcoal box 14, and the other end is connected to the combustion module.

[0027] The specific structure of the discharge cooling module in this embodiment is as follows: It includes a spiral tube 18, a third drive motor, and a cooling guide tube. The drive end of the third drive motor is connected to the spiral tube 18. One end of the spiral tube 18 is located inside the heat-insulating carbon box 14 and below the horizontal rotating grid 15. The other end of the spiral tube 18 is connected to the cooling guide tube, which is connected to the recycling module.

[0028] The specific structure of the combustion module in this embodiment is as follows: It includes an oil burner 12 and a combustion chamber 13. The combustion end of the oil burner 12 is located inside the combustion chamber 13. The top of the combustion chamber 13 is connected to the pyrolysis furnace 11. The other end of the reverse injection pipe is located inside the combustion chamber 13 and is inclined to the combustion end of the oil burner 12.

[0029] The specific structure of the spray module in this embodiment is as follows: It includes a cooling pipe 23, an atomizing pipe 22, a nozzle 25, a water supply tank 20, and a filter box 17. The atomizing pipe 22 and the nozzle 25 are connected to the water supply tank 20 through the cooling pipe 23. The filter box 17 is located inside the water circulation module, and the nozzle 25 and the atomizing pipe 22 are located above the recovery module. The water circulation module includes a water tank 16 and a return water pipe 24. The water tank 16 is located below the recycling module, and the return water pipe 24 is connected to the water tank 16 and the filter box 17 respectively.

[0030] Specifically, there are two atomizing tubes 22 arranged in parallel, and the nozzle 25 is located between the two atomizing tubes 22.

[0031] The feeding module in this embodiment includes a hopper 5 and a sealing valve 4. The sealing valve 4 is located inside the hopper 5, and the hopper 5 is provided with a window 3.

[0032] Meanwhile, an explosion-proof safety valve 9 is installed on the pyrolysis furnace 11, and a temperature sensor 21 is installed at the recycling module.

[0033] The material lifting module in this embodiment includes a material lifting hopper and a screw conveyor 1.

[0034] Based on the above structure, this embodiment takes processing 100 kg / h of rice husks as an example, and its workflow is as follows: Feeding stage: The rice husk material on the ground is lifted into the hopper by the screw conveyor 1 and then into the silo 5. A sealing valve 4 is connected to the bottom of the silo 5, through which the material enters the feed end of the horizontal pyrolysis cylinder 8 in a quantitative and sealed manner.

[0035] Pyrolysis reaction stage: The material entering the pyrolysis cylinder 8 is slowly pushed towards the discharge end by the pyrolysis screw 6. The pyrolysis cylinder 8 is surrounded and heated by the pyrolysis furnace 11. During the start-up stage, the fuel burner 12 operates, and the flame and high-temperature flue gas it generates uniformly heat the pyrolysis cylinder 8 within the pyrolysis furnace 11, raising the temperature of the material inside the cylinder to 500-600°C and initiating the pyrolysis reaction. The pyrolysis screw 6 adopts a shaftless design (e.g., outer diameter 280mm, inner diameter 120mm), avoiding the problem of material accumulation on the central shaft and ensuring smooth conveying. An explosion-proof safety valve 9 is installed at the top of the pyrolysis furnace 11, which automatically releases pressure when the furnace pressure is abnormal, ensuring equipment safety.

[0036] To precisely plan and guide the flow path of the high-temperature flue gas inside the furnace and maximize its exhaust, a continuous spiral guide fin 10 is welded to the outer wall of the pyrolysis cylinder 8. This spiral guide fin 10 extends from one end of the pyrolysis cylinder 8 to the other, forming a narrow, independent spiral exhaust channel together with the inner wall of the pyrolysis furnace 11. All the high-temperature flue gas inside the furnace is forced to flow along this pre-designed exhaust channel, ultimately being guided to the chimney at the other end of the pyrolysis furnace 11 and discharged. This design transforms the disordered, short-circuited natural convection into ordered, long-distance forced convection, ensuring that the flue gas undergoes maximum heat exchange with the pyrolysis cylinder 8 before exhaust, greatly improving energy efficiency.

[0037] In the gas-fired self-heating stage: the solid products (biochar) and gaseous products (pyrolysis volatiles) generated by pyrolysis are pushed together by the pyrolysis screw 6 to the insulated charcoal box 14. Inside the insulated charcoal box 14, the biochar falls due to gravity, while the lighter pyrolysis volatiles are discharged from the upper outlet of the insulated charcoal box 14. A portion of the pyrolysis volatiles is guided back to the combustion chamber 13 through a reverse injection pipe. This reverse injection pipe is inserted into the combustion chamber 13 at a 135° angle, causing the high-pressure ejected combustible gas to form a strong collision and vortex mixing with the flame of the oil burner 12, thereby achieving efficient and stable combustion. Once the above-mentioned reheating process is operating stably, the heat required by the pyrolysis furnace 11 is mainly provided by this portion of the reheated gas. At this time, the oil burner 12 can be significantly reduced or shut down, achieving energy-saving self-heating operation.

[0038] Closed conveying and spray cooling stage: After pyrolysis, the falling biochar is homogenized by a horizontal rotating grid 15 within the insulated biochar box 14 before falling to the bottom of the insulated biochar box 14. The inlet of the spiral tube 18 is sealed to the outlet at the bottom of the insulated biochar box 14. The core function of the spiral tube 18 is to act as a dynamically sealed conveying channel, stably conveying the high-temperature dry biochar to the conveyor belt of the recovery module at a rate set by the third drive motor. A spray module is installed above the conveyor belt of the recovery module. The water supply tank 20 supplies water to the atomizing tube 22 and the nozzle 25 through the cooling pipe 23. Based on the arrangement of the atomizing tube 22 and the nozzle 25, a multi-point, multi-form water distribution design is achieved, which can generate a large-scale, high-density, and uniform composite water mist, ensuring that the biochar layer moving on the conveyor belt can be completely and without dead angles. The fine water mist evaporates instantly upon contact with the high-temperature biochar, and a large amount of heat is dissipated through the efficient phase change heat transfer system, achieving instantaneous cooling of the biochar. At the same time, the temperature sensor 21 can monitor the temperature and adjust the working status of the spray module in real time.

[0039] Cooling water circulation stage: Excess cooling water and condensed steam during the spraying process are collected by the water tank 16 of the water circulation module below the conveyor belt of the recovery module and discharged through the return water pipe 24. The discharged wastewater flows through the filter to remove carbon powder and enters the water supply tank 20 for storage. A water pump 19 is installed at the outlet of the cooling pipe 23. After being pressurized by the water pump 19, it is sent back to the spraying module, thus forming a complete, efficient and water-saving closed-loop circulation system.

[0040] In summary, the advantages of this application are as follows: 1. Three-dimensional synergistic enhancement of heat transfer to achieve pyrolysis uniformity: Axial Uniformity: This invention creatively employs a counter-current spiral heat exchange structure for flue gas. High-temperature flue gas spirals along the outer wall of the pyrolysis cylinder 8 and exits through the chimney component 7, opposite to the direction of material movement inside. This counter-current design ensures a more uniform axial heat transfer temperature difference throughout the pyrolysis cylinder 8, avoiding the problem of "insufficient front-end temperature and excessively high rear-end temperature" caused by traditional co-current heating, and guaranteeing a stable and continuous heat supply to the material throughout the entire reaction path. Radial uniformity: The pyrolysis auger 6 adopts a shaftless, large-diameter main auger design. The rotation of the auger not only provides axial thrust, but more importantly, it continuously and gently tumbles and agitates the loose material layer. This design completely breaks the temperature difference between the inside and outside of the static material layer, allowing each material particle to have the opportunity to contact the high-temperature cylinder wall, achieving a breakthrough from "outer layer coking, inner layer undercooked" to "uniform heating throughout," resulting in a more thorough pyrolysis reaction and a significant increase in the fixed carbon content and uniformity of the biochar.

[0041] 2. Gas recirculation self-heating system, achieving efficient utilization of the energy contained in the materials themselves: The combustible volatiles produced by pyrolysis are returned to the combustion chamber 13 through a specially designed 135° inclined reverse injection pipe. This design not only achieves energy recycling and self-use, but more importantly, by adjusting the fuel supply to the combustion chamber 13, all the pyrolysis gas is recycled, allowing for very precise and rapid adjustment of the output power of the combustion chamber 13. Compared to the large thermal inertia of traditional oil / gas burners, this method can more accurately maintain the temperature stability of the pyrolysis furnace 11, avoiding the impact of large temperature fluctuations on product quality.

[0042] 3. Rotary grid enhances tar removal and homogenized discharge: Inside the insulated charcoal box 14, a horizontal rotating grid 15 is installed. The high-temperature biochar discharged from the pyrolysis cylinder 8) first falls onto the horizontal rotating grid 15. Through the rotation and agitation of the horizontal rotating grid 15, the volatile substances such as tar attached to or entrained in the biochar are re-gasified and fully separated from the solid particles. This ensures that the gaseous products can be smoothly discharged from the gas outlet at the top of the insulated charcoal box 14, avoiding the problem of tar condensation and adhesion during the subsequent cooling process.

[0043] 4. Integrated design of spray quenching and steam management: As the high-temperature biochar discharged from the insulated biochar box 14 falls, it is sprayed by a high-density water mist generated by the spray module. The water mist evaporates instantly, absorbing heat and reducing the biochar from several hundred degrees Celsius to a safe temperature, eliminating the risk of spontaneous combustion. Simultaneously, the system is equipped with dedicated steam management nozzles 25, which form an air curtain through jets of air or water mist to effectively guide and suppress the large amount of water vapor generated by the rapid cooling, preventing it from flowing back into the pyrolysis system or spreading disorderly, thus ensuring the stability of the system operation.

[0044] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model in any way. Therefore, any modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of the present utility model without departing from the technical solution of the present utility model shall still fall within the scope of the technical solution of the present utility model.

Claims

1. A gas-fired self-heating biomass continuous pyrolysis device, characterized in that, It includes a material feeding module, a material discharging module, a pyrolysis module, a combustion module, a heat preservation module, a discharge cooling module, a recycling module, a spraying module, and a water circulation module; The two ends of the feeding module are respectively connected to the feeding module and the pyrolysis module. The pyrolysis module is respectively connected to the combustion module and the heat preservation module. The heat preservation module is connected to the recovery module through the discharge cooling module. The spray module is located above the recovery module, and the water circulation module is located below the recovery module. The spray module is connected to the water circulation module. The pyrolysis module includes a pyrolysis furnace, a pyrolysis cylinder, a first drive motor, a pyrolysis spiral component, a chimney component, and spiral guide fins. The chimney component is connected to the pyrolysis furnace. The pyrolysis cylinder is arranged along the length of the pyrolysis furnace and passes through it. The pyrolysis spiral component is located inside the pyrolysis cylinder. The drive end of the first drive motor is connected to one end of the pyrolysis spiral component. One end of the pyrolysis cylinder is connected to the insulation module. The spiral guide fins are disposed on the outer wall surface of the pyrolysis cylinder. The spiral guide fins, the pyrolysis cylinder, and the pyrolysis furnace form a flue gas passage. One end of the flue gas passage faces the chimney component.

2. The gas-fired self-heating biomass continuous pyrolysis device according to claim 1, characterized in that, The heat preservation module includes a heat preservation charcoal box, a horizontal rotating grid, a second drive motor, and a reverse injection pipe. The horizontal rotating grid is located inside the heat preservation charcoal box. The drive end of the second drive motor is connected to the horizontal rotating grid. One end of the reverse injection pipe is connected to the top of the heat preservation charcoal box, and the other end is connected to the combustion module.

3. The gas-fired self-heating biomass continuous pyrolysis device according to claim 2, characterized in that, The discharge cooling module includes a spiral tube, a third drive motor, and a cooling guide tube. The drive end of the third drive motor is connected to the spiral tube. One end of the spiral tube is located inside the heat-insulating carbon box and below the horizontal rotating grid. The other end of the spiral tube is connected to the cooling guide tube, which is connected to the recycling module.

4. The gas-fired self-heating biomass continuous pyrolysis device according to claim 2, characterized in that, The combustion module includes an oil burner and a combustion chamber. The combustion end of the oil burner is located in the combustion chamber. The top of the combustion chamber is connected to the pyrolysis furnace. The other end of the reverse injection pipe is located in the combustion chamber and is inclined to the combustion end of the oil burner.

5. The gas-fired self-heating biomass continuous pyrolysis device according to claim 1, characterized in that, The spray module includes a cooling pipe, an atomizing pipe, a nozzle, a water supply tank, and a filter box. The atomizing pipe and the nozzle are connected to the water supply tank through the cooling pipe. The filter box is located inside the water circulation module, and the nozzle and the atomizing pipe are located above the recovery module. The water circulation module includes a water tank and a return water pipe. The water tank is located below the recycling module, and the return water pipe is connected to the water tank and the filter box respectively.

6. The gas-fired self-heating biomass continuous pyrolysis device according to claim 5, characterized in that, The atomizing tubes are two in number and arranged in parallel, and the nozzle is located between the two atomizing tubes.

7. The gas-fired self-heating biomass continuous pyrolysis device according to claim 1, characterized in that, The feeding module includes a hopper and a sealing valve. The sealing valve is located inside the hopper, and the hopper has a window.

8. The gas-fired self-heating biomass continuous pyrolysis device according to claim 1, characterized in that, The pyrolysis furnace is equipped with an explosion-proof safety valve.

9. The gas-fired self-heating biomass continuous pyrolysis device according to claim 1, characterized in that, The material lifting module includes a material lifting hopper and a screw conveyor.

10. The gas-fired self-heating biomass continuous pyrolysis device according to claim 1, characterized in that, A temperature sensor is installed at the recycling module.

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