Solar-driven biomass continuous pyrolysis spiral reactor and test method

Abstract

The invention provides a solar-driven biomass continuous pyrolysis spiral reactor and a test method, and belongs to the field of solar photo-thermal utilization and biomass energy conversion. The problems of high dependence on fossil energy, high energy consumption and uneven heating in the traditional biomass pyrolysis process are solved. The invention relates to a solar-driven biomass continuous pyrolysis spiral reactor, which comprises: a sealing box in which a motor is arranged; the feeding barrel is used for continuously supplying biomass; the gas inlet is connected with the gas pipeline and is used for introducing inert gas into the reactor; the stainless steel tube reactor is internally provided with a spiral shaft and is driven by a motor to continuously convey biomass; the silicon carbide heating sleeve sleeves the outer side of the stainless steel tube reactor and is used for receiving solar reflected light and forming a high-temperature pyrolysis area in the axial direction of the reactor; the gas outlet is used for discharging a high-temperature gas product; and the discharging pipe and the discharging barrel are used for continuously discharging and collecting the charcoal solid products under the action of gravity. The device is mainly used for solar photo-thermal driven biomass continuous pyrolysis.

Description

Technical Field

[0001] This invention belongs to the field of solar thermal utilization and biomass energy conversion, and in particular relates to a solar-driven continuous biomass pyrolysis spiral reactor and experimental method. Background Technology

[0002] Biomass, as a renewable carbon resource, boasts advantages such as wide availability, abundant reserves, and carbon neutrality. Through pyrolysis technology, it can be converted into high-value-added products such as biochar, bio-oil, and combustible gases, showing significant application prospects in energy utilization, environmental governance, and carbon emission reduction. Biomass pyrolysis typically requires anaerobic or low-oxygen conditions at high temperatures of 400-700℃, thus placing high demands on reactor structure, heating methods, and operational stability. Existing biomass pyrolysis devices mostly use electric heating, gas heating, or coal heating to provide the heat required for the reaction. These heating methods generally suffer from high energy consumption, high operating costs, high carbon emissions, and system complexity. Especially under medium- and high-temperature continuous pyrolysis conditions, the dependence on external energy sources is high, which is detrimental to the green and low-carbon utilization of biomass energy. Regarding reactor structure, some biomass pyrolysis units employ fixed-bed or batch reaction methods, which suffer from problems such as difficulty in precisely controlling material residence time, low heat and mass transfer efficiency, and difficulty in achieving continuous and stable operation. Although some continuous units have introduced screw conveyor structures, they are prone to insufficient sealing performance, unstable feeding, or obstructed solid discharge under high-temperature environments, limiting their engineering applications. Furthermore, existing units often focus on chemical kinetics or product analysis studies, lacking an overall design scheme that is deeply coupled with renewable heat sources.

[0003] In recent years, solar thermal technology has attracted widespread attention due to its cleanliness, sustainability, and high-temperature potential. However, in the field of continuous biomass pyrolysis, the efficient coupling of solar energy with reactor structure is still in the exploratory stage. Existing research often uses solar energy in intermittent or small-scale experimental systems, which suffers from limited light-receiving area, short heating zone length, and large fluctuations in pyrolysis temperature, making it difficult to meet the needs of continuous pyrolysis experiments and performance control. Furthermore, a prominent technical challenge of solar concentrating heating is that the energy distribution of the concentrated light spot is usually Gaussian or similarly non-uniform, resulting in a significant gradient in the axial temperature field of the heated reactor tube section. If directly applied to the continuous biomass pyrolysis process, it easily leads to uneven heating of the material within the reactor. Some areas experience excessively high temperatures, resulting in over-pyrolysis or even gasification of the biomass, while other areas suffer from insufficient temperatures, leading to incomplete pyrolysis and severely affecting the quality uniformity and yield of products such as biochar. Existing external heating methods mainly focus on improving overall heating power or temperature resistance, and there is currently no design for a heating sleeve structure specifically designed to optimize the axial temperature field uniformity based on the characteristics of solar concentrating energy distribution. Therefore, it is necessary to provide a biomass pyrolysis reactor and experimental method that can effectively utilize solar energy as a heat source, has continuous operation capability, relatively stable temperature in the pyrolysis zone, and controllable material transportation, so as to reduce external energy consumption, improve the controllability and experimental repeatability of the pyrolysis process, and provide reliable technical support for the research and engineering application of solar-driven biomass pyrolysis technology. Summary of the Invention

[0004] In view of this, the present invention aims to propose a solar-driven continuous biomass pyrolysis spiral reactor and experimental method to solve the problems of high dependence on external energy sources such as electricity or fossil energy and low solar thermal utilization efficiency in traditional pyrolysis processes.

[0005] To achieve the above objectives, according to one aspect of the present invention, a solar-driven biomass continuous pyrolysis spiral reactor is provided, comprising: A sealed box containing a motor. Feeding hopper, used to hold biomass pellets to be heated; The air inlet, connected to the gas pipeline, is used to supply inert gas to the reactor; The stainless steel tube reactor is used to contain and continuously transport heated biomass pellets. The internal spiral shaft is driven by an electric motor to complete the biomass feeding. The silicon carbide heating sleeve is fitted over the stainless steel tube reactor and is mainly used to receive reflected solar light and expand the high-temperature heating zone for pyrolysis of biomass. The outlet is used to discharge inert gases and high-temperature condensable and non-condensable gaseous products. The discharge pipe is connected to the upper end of the stainless steel tube reactor, and discharges the solid product biochar under the action of gravity. The discharge bucket, connected to the lower end of the discharge pipe, is used to receive the solid product biochar after the reaction.

[0006] Furthermore, the sealed box is a high-temperature resistant sealing structure, which can prevent outside air from entering the reactor and prevent product gas leakage, thus ensuring the airtightness of the entire device and the safety of the pyrolysis process.

[0007] Furthermore, the spiral shaft is made of high-temperature resistant 316 stainless steel, and its rotation speed is adjustable to control the residence time and degree of pyrolysis of biomass.

[0008] Furthermore, the stainless steel tube reactor has a high-temperature and corrosion-resistant structure, enabling it to operate stably for a long time under pyrolysis conditions above 500°C.

[0009] Furthermore, the silicon carbide heating sleeve possesses high solar energy absorption rate and high thermal conductivity, which are used to expand the high-temperature pyrolysis zone of the reactor and improve the biomass pyrolysis efficiency. The silicon carbide heating sleeve adopts a variable-diameter multi-segment structure. Specifically, the sleeve is designed along the axial direction as at least two segments with different diameters, including a high-temperature main heating segment with a larger diameter in the middle, and temperature transition segments with gradually decreasing diameters on both sides. This structure, through optical and thermal matching design, can better adapt to the energy distribution of the solar concentrating spot, more effectively diffusing the concentrated solar radiation heat energy along the reactor axis. Thus, without significantly increasing the concentration ratio, it significantly expands the high-temperature uniform region along the reactor axis, reduces the axial temperature gradient, and effectively prevents the problem of excessive biomass pyrolysis caused by local overheating.

[0010] Furthermore, the silicon carbide heating sleeve is used in conjunction with an external solar concentrator to achieve directional reflection and concentrated heating of solar energy.

[0011] Furthermore, the inert gas introduced through the air inlet is argon, which is used to suppress the biomass oxidation reaction and promote the pyrolysis reaction, as well as to purge and discharge high-temperature gaseous products.

[0012] Furthermore, the gas outlet is connected to a gas condensation device for recycling the condensable gas generated by pyrolysis.

[0013] Furthermore, the discharge pipe is inclined, allowing the biochar to be automatically discharged under gravity, reducing the risk of solid blockage and enabling continuous recovery of solid products.

[0014] Furthermore, the reactor is a continuous operation structure, which uses a motor to drive a screw shaft to achieve continuous feeding, pyrolysis and discharge of biomass, thereby improving system operating efficiency and industrial applicability.

[0015] According to another aspect of the present invention, a test method for using the above-described solar-driven biomass continuous pyrolysis spiral reactor is provided, comprising the following steps: S1. After crushing and sieving the biomass raw material to be tested into the predetermined particle size range, load it into the feed bucket, check the sealing of the sealed box, stainless steel tube reactor and each connection part to ensure that the reactor is in a closed state. S2. Inert gas is introduced into the stainless steel tube reactor through the air inlet to replace the gas inside the reactor and establish an oxygen-free or low-oxygen pyrolysis environment. S3. Adjust the external solar concentrator so that the reflected solar light is focused and irradiated onto the outer surface of the silicon carbide heating sleeve, so that the temperature of the stainless steel tube reactor gradually rises to the target pyrolysis temperature range. S4. Start the motor and drive the screw shaft to rotate, so that the biomass pellets continuously enter the stainless steel tube reactor from the feed hopper and are continuously transported to the heating zone along the reactor axis under the action of the screw shaft; under the conditions of solar heating and inert gas protection, the biomass pellets complete the continuous pyrolysis reaction in the stainless steel tube reactor to generate biochar, condensable gas and non-condensable gas. S5. Discharge the gaseous products generated during the pyrolysis process through the gas outlet, and condense and collect the gas according to the experimental requirements. S6. After pyrolysis, the biochar is continuously discharged through the discharge pipe and collected in the discharge bucket under the action of screw conveyor and gravity. S7. After the reaction is complete, turn off the motor, remove the heating and focusing spot, turn off the flow meter, remove the condenser and gas sampling bag, and the experiment is over.

[0016] Compared with the prior art, the beneficial effects of the present invention are: 1. This device combines solar thermal utilization with the continuous pyrolysis process of biomass. It uses clean and renewable solar energy as the main heat source and realizes high-temperature pyrolysis conversion of biomass under inert gas protection conditions. This effectively reduces the energy consumption and carbon emissions caused by traditional electric heating or fossil energy heating methods and promotes the high-value utilization of biomass resources. 2. This device uses a silicon carbide heating sleeve to wrap and heat a stainless steel tube reactor, enabling the solar reflected light to form a continuously distributed volumetric high-temperature heating zone within the axial range of the reactor, rather than being concentrated only on the local light-receiving surface. This reduces radiant heat loss, improves the light-to-heat conversion efficiency and the temperature uniformity of the pyrolysis zone. The silicon carbide heating sleeve innovatively adopts a variable-diameter multi-segment structure, which is designed according to the characteristics of the non-uniform energy distribution of the solar concentrating spot. It can effectively broaden the axial high-temperature heating zone, significantly reduce the axial temperature gradient of the reaction tube, ensuring that the biomass particles are heated more evenly during the conveying process, avoiding over-pyrolysis caused by local overheating or incomplete pyrolysis due to insufficient local temperature, and significantly improving the quality uniformity of the biochar product and the overall pyrolysis efficiency.

[0017] 3. The overall structure of this device is compact, the structure is simple, and the cost is low. In the spiral conveyor reaction zone, the biomass particles are heated more evenly during the axial conveying and flipping processes, and the temperature gradient along the material conveying direction is small, which is beneficial to the stable progress of the pyrolysis reaction and the precise regulation of process parameters. 4. This device utilizes the synergistic effect of the spiral shaft drive and gravity to achieve continuous conveying and discharging of materials, transforming the reaction process into continuous operation, thereby enhancing the operation stability and processing efficiency of the device. 5. The experimental method supporting this device can flexibly control the residence time of biomass and the pyrolysis conditions by adjusting the spiral shaft speed, inert gas flow rate, and solar incident intensity. It is applicable to the study of the pyrolysis behavior of different types of biomass raw materials and has good experimental repeatability and scalability. Brief Description of the Drawings

[0018] The drawings forming a part of this invention are used to provide a further understanding of this invention. The schematic embodiments of this invention and their descriptions are used to explain this invention and do not constitute an improper limitation to this invention. In the drawings: Figure 1 is a schematic structural diagram of a solar-driven continuous biomass pyrolysis spiral reactor described in this invention; Figure 2 is a schematic structural diagram of the silicon carbide variable-diameter heating sleeve described in this invention; Figure 3 is a flow chart of an experimental method using a solar-driven continuous biomass pyrolysis spiral reactor described in this invention.

[0019] Motor 1; Sealing box 2; Feed bucket 3; Air inlet 4; Stainless steel tube reactor 5; Spiral shaft 6; Silicon carbide heating sleeve 7; Air outlet 8; Discharge pipe 9; Discharge bucket 10. Detailed Embodiments

[0020] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. It should be noted that, unless otherwise specified, the embodiments and features in the embodiments of the present invention can be combined with each other, and the described embodiments are only some embodiments of the present invention, not all embodiments.

[0021] It should be noted that the descriptions of "left," "right," "left side," "right side," "upper part," "lower part," "top," and "bottom" in this invention are defined based on the orientation or positional relationships shown in the accompanying drawings. They are merely for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the described structure must be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0022] In the description of this invention, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0023] Referring to the accompanying drawings, this embodiment of the invention provides a solar-driven biomass continuous pyrolysis spiral reactor, comprising: The sealed box 2 is equipped with a motor 1 inside. The sealed box 2 is made of stainless steel 316 and is machined into a rectangular box with a length of 578mm, a width of 300mm, and a height of 260mm. The built-in motor has a power of 1.5kW and can drive the feeding and transportation of biomass pellets.

[0024] The stainless steel tube reactor 5 is used to contain and continuously transport heated biomass pellets. An internal spiral shaft 6, driven by a motor 1, feeds and transports the biomass pellets. The reactor 5 has two branches at its lower end: one connects to the feed tank 3, and the other to the air inlet 4. The feed tank 3 contains the biomass pellets to be heated and is connected to the lower branch of the reactor 5 using a flange and sealing ring. The air inlet 4 connects to the air inlet pipe to supply inert gas to the reactor; the inert gas can be selected according to actual needs, such as argon. The reactor 5 also has two branches at its upper end: one connects to the discharge pipe 9, and the other to the air outlet 8. The outlet 8 is directly welded to the discharge pipe 9 to maintain a consistent tilt angle. The air outlet 8 connects to a condenser consisting of two series-connected ice-water bath glass bottles and a gas bag to discharge and collect inert gas and condensable and non-condensable gaseous products.

[0025] The silicon carbide heating sleeve 7, fitted over the stainless steel tube reactor 5, is primarily used to receive reflected light from the solar concentrator, adjusting the focal point to the center of the silicon carbide heating sleeve 7, thereby heating and pyrolyzing the biomass pellets in the high-temperature zone of the stainless steel tube reactor 5. Multiple thermocouples are fixed to the surface of the silicon carbide heating sleeve 7 via wall-mounted connections, and these thermocouples are connected to a temperature measuring instrument for temperature detection.

[0026] The discharge pipe 9 is connected to the upper end of the stainless steel tube reactor 5. Since the stainless steel tube reactor 5 needs to be installed in conjunction with a solar concentrator, the overall reactor structure is set at an inclined arrangement so that the discharge pipe 9 and the reactor 5 maintain the same inclination angle. Through the above structural design, the solid product biochar after the pyrolysis reaction can be automatically discharged along the discharge pipe 9 under the action of gravity, reducing the retention of solid materials in the reactor, reducing the risk of blockage, and ensuring the continuous and stable operation of the device.

[0027] The discharge hopper 10 is connected to the lower end of the discharge pipe 9 and is used to receive the solid product biochar discharged from the discharge pipe 9 after the reaction is completed. The connection between the discharge hopper 10 and the lower branch of the discharge pipe 9 is made by means of flange and sealing ring.

[0028] In this embodiment, the sealing box 2 is a high-temperature resistant sealing structure, which can effectively block outside air from entering the reactor and prevent product gas leakage, thus ensuring the airtightness of the entire device.

[0029] In this embodiment, the spiral shaft 6 is made of high-temperature and corrosion-resistant 316 stainless steel, suitable for pyrolysis environments above 500 ℃. The spiral shaft 6 has a pitch of 70 mm and its lower end is connected to the motor 1. The motor 1 is equipped with a reduction gear to achieve low-speed, high-torque output. Adjusting the rotational speed of the spiral shaft 6 controls the axial conveying speed of the biomass pellets. Simultaneously, the tumbling and axial propulsion of the spiral shaft 6 ensures more uniform heating of the biomass pellets, preventing pellet accumulation and the formation of hot spots.

[0030] In this embodiment, the stainless steel tube reactor 5 has a diameter of 102 mm, a length of 1650 mm, and a wall thickness of 3 mm. The stainless steel tube reactor 5 is made of high-temperature and corrosion-resistant 316 stainless steel, capable of withstanding high-temperature pyrolysis reaction environments exceeding 500 °C. The outer surface of the stainless steel tube reactor 5 undergoes a blackening treatment to prevent oxidation at high temperatures. Simultaneously, the stainless steel tube reactor 5 is installed in conjunction with the spiral shaft 6 to prevent friction between the blades and the wall surface. A 3 mm gap is provided, and the residence time of the biomass pellets in the high-temperature heating zone is controlled by adjusting the rotation speed of the spiral shaft 6, ensuring complete pyrolysis of the biomass pellets.

[0031] In this embodiment, the silicon carbide heating sleeve 7 has high solar energy absorptivity and high thermal conductivity, which is used to expand the high-temperature pyrolysis zone of the reactor and improve the biomass pyrolysis efficiency; at the same time, it is used in conjunction with an external solar concentrator to receive reflected sunlight and perform centralized heating. The silicon carbide heating sleeve 7 is integrally processed into a variable diameter multi-segment structure, with a diameter of 108 mm at both the top and bottom ends, a diameter of 150 mm in the middle, a total sleeve length of 200 mm, and symmetrical temperature transition sections on both sides, each about 100 mm long. The outer diameter linearly tapers from 150 mm to 108 mm. This structure can form an extended high-temperature heating zone in the axial direction of the reactor 5 and reduce the temperature gradient along the axial direction. The silicon carbide heating sleeve 7 has a high solar energy absorptivity of 0.9 and a high thermal conductivity of about 120 W / (m·K), which can fully absorb and utilize reflected solar light. The silicon carbide heating sleeve 7 is tightly fixed and installed along the axial direction of the stainless steel tube reactor 5, and is preferably arranged at a distance of 100-300 mm from the top of the reactor, depending on the focal position of the solar concentrator. The variable diameter structure of the silicon carbide heating sleeve 7 efficiently absorbs solar radiation and converts it into heat energy. Through the excellent thermal conductivity of silicon carbide, the axial heat dissipation area is expanded, and the heat is conducted more evenly in the radial direction to the stainless steel tube reactor 5. A high-temperature pyrolysis zone with an axial length of about 200 mm and a temperature of more than 550 ℃ is formed inside, avoiding the problem of large axial temperature difference and local overheating under concentrated light heating.

[0032] In this embodiment, the inert gas introduced through the air inlet 4 is argon, which is used to suppress the biomass oxidation reaction and promote the pyrolysis reaction, as well as to purge and discharge high-temperature gaseous products.

[0033] In this embodiment, the gas outlet 8 is connected to a gas condensation device for recycling the condensable and non-condensable gases generated by pyrolysis.

[0034] In this embodiment, the discharge pipe 9 is inclined so that the solid product biochar is automatically discharged under gravity, reducing the risk of solid blockage and realizing continuous recycling of biochar.

[0035] According to another aspect of the present invention, a test method using the above-described solar-driven biomass continuous pyrolysis spiral reactor is provided, comprising the following steps: S1. After crushing and sieving the pine biomass raw material to be tested to a predetermined particle size range of 30mm-40mm, load it into the feed bucket 3, check the sealing box 2, stainless steel tube reactor 5 and the sealing of each connection part to ensure that the reactor is in a closed state. S2. Inert argon gas is introduced into the stainless steel tube reactor 5 through the air inlet 4 at a flow rate of 200 sccm to replace the gas inside the reactor and establish an oxygen-free or low-oxygen pyrolysis environment. S3. Adjust the external solar concentrator so that the reflected solar light is focused and irradiated to the center of the outer surface of the silicon carbide heating sleeve 7, so that the temperature of the stainless steel tube reactor 5 gradually rises to the set pyrolysis temperature range of 550℃-650℃. S4. Start motor 1 to drive screw shaft 6 to rotate, so that biomass pellets continuously enter stainless steel tube reactor 5 from feed hopper 3 and are continuously transported to heating zone along reactor axis under the action of screw shaft 6; under solar heating and inert gas protection conditions, biomass pellets complete continuous pyrolysis reaction in stainless steel tube reactor 5 to generate biochar, condensable gas and non-condensable gas. S5. The high-temperature gaseous products generated during the pyrolysis process are discharged through the outlet 8 and transported to the condensation device through the high-temperature resistant gas pipeline. The condensable gas is condensed and collected, and the non-condensable gas that remains gaseous after condensation is collected in the gas sampling bag through the gas pipe. S6. After pyrolysis, the biochar is continuously discharged through the discharge pipe 9 and collected in the discharge bucket 10 under the action of screw conveyor and gravity. S7. After the reaction is complete, turn off motor 1, remove the heating and focusing spot, turn off the flow meter, remove the condenser and gas sampling bag, and the experiment ends.

[0036] The embodiments of the present invention disclosed above are merely illustrative of the invention. These embodiments do not exhaustively describe all details, nor do they limit the invention to the specific implementations described. Many modifications and variations can be made based on the content of this specification. This specification selects and specifically describes these embodiments to better explain the principles and practical applications of the invention, thereby enabling those skilled in the art to better understand and utilize the invention.

Claims

1. A solar-driven biomass continuous pyrolysis spiral reactor, characterized in that, include: The sealed box (2) is equipped with a motor (1) inside. Feeding bucket (3) is used to hold the biomass pellets to be heated; The air inlet (4) is connected to the gas pipeline and is used to supply inert gas to the reactor; The stainless steel tube reactor (5) is used to contain and continuously transport heated biomass pellets. The internal spiral shaft (6) is driven by the motor (1) to complete the biomass feeding. The silicon carbide heating sleeve (7) is fitted outside the stainless steel tube reactor (5) and is mainly used to receive solar reflected light and expand the heating high-temperature zone for pyrolysis of biomass. The outlet (8) is used to discharge inert gases and high-temperature condensable and non-condensable gas products; The discharge pipe (9) is connected to the upper end of the stainless steel tube reactor (5) and discharges solid biochar under the action of gravity. The discharge bucket (10) is connected to the lower end of the discharge pipe (9) and is used to receive the solid product biochar after the reaction.

2. The solar-driven biomass continuous pyrolysis spiral reactor according to claim 1, characterized in that: The sealed box (2) is a high-temperature resistant sealing structure that can prevent outside air from entering the reactor and also prevent product gas leakage, thus ensuring the airtightness of the entire device and the safety of the pyrolysis process.

3. The solar-driven biomass continuous pyrolysis spiral reactor according to claim 1, characterized in that: The spiral shaft (6) is made of high-temperature resistant stainless steel 316 material, and its rotation speed is adjustable to control the residence time and degree of pyrolysis of biomass. The spiral shaft (6) is driven by the motor (1) to realize the continuous feeding, pyrolysis and discharge of biomass, thereby improving the operating efficiency of the device.

4. The solar-driven biomass continuous pyrolysis spiral reactor according to claim 1, characterized in that: The stainless steel tube reactor (5) has a high temperature and corrosion resistant structure and can operate stably for a long time under pyrolysis conditions above 500℃.

5. The solar-driven biomass continuous pyrolysis spiral reactor according to claim 1, characterized in that: The silicon carbide heating sleeve (7) has high solar energy absorption rate and high thermal conductivity, which is used to expand the high-temperature pyrolysis zone of the reactor and improve the biomass pyrolysis efficiency. The silicon carbide heating sleeve (7) is a multi-segment structure with variable diameter along the axial direction, including a high-temperature main heating section with a larger diameter and a temperature transition section with a gradually decreasing diameter located on both sides of it, which is used to match the energy distribution of solar concentrating spot and optimize the uniformity of the axial temperature field of the reactor.

6. The solar-driven biomass continuous pyrolysis spiral reactor according to claim 1 or 5, characterized in that: The silicon carbide heating sleeve (7) is used in conjunction with an external solar concentrator to achieve directional reflection and concentrated heating of solar energy.

7. The solar-driven biomass continuous pyrolysis spiral reactor according to claim 1, characterized in that: The inert gas introduced through the air inlet (4) is argon, which is used to suppress the biomass oxidation reaction and promote the pyrolysis reaction, as well as to purge and discharge high-temperature gas products.

8. The solar-driven biomass continuous pyrolysis spiral reactor according to claim 1, characterized in that: The gas outlet (8) is connected in sequence to the gas condensation device and the gas sampling bag, and is used to recover and reuse the condensable and non-condensable gases generated by pyrolysis.

9. The solar-driven biomass continuous pyrolysis spiral reactor according to claim 1, characterized in that: The discharge pipe (9) is inclined so that the biochar is automatically discharged under gravity, reducing the risk of solid blockage and realizing the continuous recovery of solid products.

10. A test method using a solar-driven biomass continuous pyrolysis spiral reactor as described in any one of claims 1-10, characterized in that, Includes the following steps: S1. After crushing and sieving the biomass raw material to be tested into the predetermined particle size range, load it into the feed bucket (3), check the sealing box (2), stainless steel tube reactor (5) and the sealing of each connection part to ensure that the reactor is in a closed state. S2. Inert gas is introduced into the stainless steel tube reactor (5) through the air inlet (4) to replace the gas inside the reactor and establish an oxygen-free or low-oxygen pyrolysis environment. S3. Adjust the external solar concentrator so that the reflected solar light is concentrated and irradiated onto the outer surface of the silicon carbide heating sleeve (7), so that the temperature of the stainless steel tube reactor (5) gradually rises to the target pyrolysis temperature range. S4. Start the motor (1) and drive the screw shaft (6) to rotate, so that the biomass pellets continuously enter the stainless steel tube reactor (5) from the feed bucket (3) and are continuously transported to the heating zone along the reactor axis under the action of the screw shaft (6); under the conditions of solar heating and inert gas protection, the biomass pellets complete the continuous pyrolysis reaction in the stainless steel tube reactor (5) to generate biochar, condensable gas and non-condensable gas. S5. The gaseous products generated during the pyrolysis process are discharged through the gas outlet (8), and the gas is condensed and collected according to the experimental requirements. S6. After pyrolysis, the biochar is continuously discharged through the discharge pipe (9) and collected in the discharge bucket (10) under the action of screw conveyor and gravity. S7. After the reaction is complete, turn off the motor (1) device, remove the heating and focusing spot, turn off the flow meter, remove the condenser and gas sampling bag, and the test is over.

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