Flexible chain type microwave pyrolysis device and pyrolysis method

Abstract

The invention provides a flexible chain type microwave pyrolysis device and a pyrolysis method. The flexible chain type microwave pyrolysis device comprises a closed shell, a chain type transmission mechanism, a flexible reaction net, a flexible scraping plate, a baffle, a heating plate and a microwave generator. The chain type transmission mechanism drives the flexible reaction net to annularly move, and raw materials directly fall on the reaction net to be heated and pyrolyzed without crushing pretreatment; a microwave generator heats the reaction area, and a heating plate and a wave-absorbing material on the surface of the flexible reaction net strengthen heat transfer; and the flexible scraping plate in the separation area strips residues through vibration scraping, and automatic residue discharging is achieved. The device can avoid bonding and blocking of raw materials, is efficient in heating, flexible in regulation and control, adaptive to various strip-shaped organic wastes such as waste paper strips and waste plastic lines, high in pyrolysis product quality, stable in operation and environment-friendly, and the treatment cost is remarkably reduced.

Description

Technical Field

[0001] This invention relates to the field of pyrolysis technology, and in particular to a flexible chain microwave pyrolysis device and pyrolysis method. Background Technology

[0002] Organic waste such as paper, tires, and fibers often exists in strip form. Large amounts of strip-shaped waste are also generated during the processing of textiles, rubber products, and plastic products. The indiscriminate disposal or landfilling of this strip-shaped waste pollutes the environment. Pyrolysis technology, as a highly efficient treatment method, offers advantages such as short processing cycles, high conversion efficiency, significant volume reduction, the ability to solidify heavy metals while avoiding dioxin formation, and the ability to recover high-value solid-liquid-gas three-phase products.

[0003] However, existing pyrolysis equipment has many drawbacks when processing strip-shaped raw materials: organic raw materials are prone to softening and sticking when heated, and their large strip size can easily cause blockage inside the equipment, leading to serious coking and slagging problems, hindering heat transfer and causing the equipment to be unable to operate stably for a long time; if the strip-shaped raw materials are crushed and pre-treated, the power consumption and processing cost of the equipment will be significantly increased, and the equipment will be bulky.

[0004] Therefore, there is an urgent need to design a new type of pyrolysis reactor that can allow strip-shaped waste to be directly fed into the pyrolysis reaction chamber for efficient pyrolysis without crushing or pretreatment, and can also promptly clean up the adhering coke and pyrolysis residues to avoid clogging of the device and maintain the stable operation of the pyrolysis process. Summary of the Invention

[0005] The purpose of this invention is to provide a flexible chain microwave pyrolysis device and pyrolysis method, which aims to solve the technical problems of easy softening, adhesion and blockage of raw materials, serious coking and slag formation, and high pretreatment costs when existing pyrolysis devices process strip-shaped organic waste.

[0006] According to one objective of the present invention, a flexible chain-type microwave pyrolysis device is provided, comprising a sealed outer shell, a chain drive mechanism, a flexible reaction mesh, multiple flexible scrapers, a pair of baffles, an upper heating plate, a lower heating plate, and multiple microwave generators; the sealed outer shell is a sealed hollow box structure, and the sealed outer shell is provided with a feed inlet, a discharge outlet, and a gas outlet; the chain drive mechanism includes a pair of parallel horizontally placed flat annular plate chains, and a drive roller, a driven roller, and multiple pairs of support rollers for supporting or traction of the plate chains; the upper region of the chain drive mechanism is divided into a driven zone, a reaction zone, and a distribution zone from the beginning to the end. The separation zone and the driving zone; the flexible reaction net is a mesh structure made of interwoven elastic wires or rods, and the two sides of the flexible reaction net are fixed to the two flat chains; the flexible scraper is a flat strip elastic structure, which is arranged at intervals above the separation zone and one end is fixed to the inner surface of the sealed shell, and the other end contacts the flexible reaction net; the baffle is arranged vertically above the flat chains and along the running direction of the flat chains, together wrapping the flexible reaction net; the upper heating plate and the lower heating plate are both arranged in the reaction zone, and the microwave generator is fixed to the outside of the sealed shell above the driven zone and the reaction zone.

[0007] Furthermore, the two flat chains are respectively close to the opposite end faces of the sealed outer shell; the driven roller is provided with driven wheels on both sides of the axial direction, the support roller is provided with support wheels on both sides of the axial direction, and the drive roller is provided with drive wheels on both sides of the axial direction, each adapted to the two flat chains; all driven rollers, support rollers and drive rollers are arranged in parallel on the same plane and have the same outer diameter, and the flat chains form an annular area around their outer surface.

[0008] Furthermore, the feed inlet is located at the top of the sealed shell above the first end of the reaction zone, and its width is less than the width of the reaction zone; the discharge outlet is located at the bottom of the sealed shell below the separation zone, and its width is greater than the width of the separation zone; the air outlet is located at the top of the sealed shell above the end of the reaction zone.

[0009] Furthermore, the flexible reaction mesh is made of high-temperature resistant steel, molybdenum, tungsten, or nickel; the flexible scraper is a steel sheet, and the interval between adjacent flexible scrapers is at least 10 mm.

[0010] Furthermore, the width of the baffle is smaller than the gap between the flat chain and the top of the sealed shell, the gap between the baffle and the flat chain is greater than 2mm, and the distance between the baffle and the flexible reaction net on the same side is greater than 2mm.

[0011] Furthermore, the upper heating plate and the lower heating plate are made of microwave-absorbing material, which is silicon carbide; the two ends of the lower heating plate are connected to the support rollers on both sides, and the difference between the spacing of the two flat chains and the axial spacing of each pair of support rollers does not exceed 50mm.

[0012] Furthermore, the microwave generator has a transmission frequency of 12-18 GHz; the gap between the flexible reaction mesh and the inner surface of the top of the sealed shell is 20-100 mm, and the length of the flexible scraper is 5-10 mm longer than this gap.

[0013] Furthermore, two links on the pair of flat chains that are positioned opposite each other are connected by a thin rod; the driven roller is equipped with a tensioning mechanism, and one end of the drive roller that extends out of the sealed housing is connected to the drive system.

[0014] According to another objective of the present invention, a pyrolysis method is provided, implemented based on the above-described flexible chain microwave pyrolysis apparatus, comprising the following steps: S1. Drive the drive roller to rotate, which in turn drives the flat chain and flexible reaction net to move at a set speed. Start the microwave generator to heat the upper heating plate, lower heating plate and flexible reaction net to 300~800℃. S2. Strip-shaped organic waste enters from the feed inlet and falls onto the flexible reaction net at the beginning of the reaction zone, where it softens, adheres, and undergoes pyrolysis. S3. The raw material moves to the separation zone along the flexible reaction net and pyrolyzes to produce pyrolysis gas. S4. The flexible scraper vibrates upon colliding with the flexible reaction mesh, peeling off the residue and discharging it through the outlet. S5. The pyrolysis gas is discharged through the outlet, and after condensation and separation, the liquid products and non-condensable gases are collected.

[0015] Further, in step S1, the rotation speed of the drive roller is 1~20 r / min, and the reaction zone forms a set temperature curve by adjusting the power of the microwave generator; the strip-shaped organic waste is waste paper strips, PET waste plastic thread, waste denim processing waste or waste tire strips, with an average length of 200~300 mm.

[0016] This invention integrates a sealed shell, a chain drive mechanism, a flexible reaction mesh, and a microwave heating system to achieve direct pyrolysis of strip-shaped organic waste without pretreatment. The flexible reaction mesh adapts to the adhesion characteristics of the raw materials, and, in conjunction with the vibration and scraping action of the flexible scraper in the separation zone, effectively prevents material blockage and coking / slagging. The microwave generator precisely heats the reaction zone, and, combined with a microwave-absorbing heating plate, achieves rapid heating with minimal heat loss, significantly improving pyrolysis efficiency. The device has a compact structure, stable operation, and a baffle design to prevent material from falling. It is suitable for treating various strip-shaped wastes, greatly reducing pretreatment costs and equipment maintenance difficulty, while balancing environmental friendliness and practicality. Attached Figure Description

[0017] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the flexible chain microwave pyrolysis device according to an embodiment of the present invention; Figure 2 This is a schematic diagram of a parallel-connected flexible reaction network according to an embodiment of the present invention; Figure 3 This is a schematic diagram of a cross-connected flexible reaction network according to an embodiment of the present invention; In the diagram: 1. Sealed outer shell; 11. Feed inlet; 12. Discharge outlet; 13. Air outlet; 2. Chain drive mechanism; 21. Driven roller; 22. Support roller; 23. Drive roller; 24. Flat chain; 3. Flexible reaction mesh; 4. Flexible scraper; 5. Baffle; 6. Upper heating plate; 7. Lower heating plate; 8. Microwave generator; A. Slave zone; B. Reaction zone; C. Separation zone; D. Driving zone. Detailed Implementation

[0019] The technical solution of the present invention will be clearly and completely described below with reference to the embodiments. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0020] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting this invention.

[0021] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the stated features. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified. Furthermore, the terms "installed," "connected," and "linked" should be interpreted broadly; for example, they may refer to a fixed connection, a detachable connection, or an integral connection; a mechanical connection or an electrical connection; a direct connection or an indirect connection through an intermediate medium; or a connection within two components. Those skilled in the art will understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0022] Example 1 like Figure 1 As shown, this embodiment of a flexible chain microwave pyrolysis device includes a sealed outer shell 1, a chain drive mechanism 2, a flexible reaction mesh 3, multiple flexible scrapers 4, a pair of baffles 5, an upper heating plate 6, a lower heating plate 7, and multiple microwave generators 8; wherein: The sealed outer shell 1 is a sealed hollow box structure that encloses all internal components. It has an inlet 11, an outlet 12 and an air outlet 13. The chain drive mechanism 2 includes a pair of parallel horizontally placed flat annular flat chains 24, and a drive roller 23, a driven roller 21 and multiple pairs of support rollers 22 for supporting or pulling the flat chains 24; the upper region of the chain drive mechanism 2 is divided into a driven zone A, a reaction zone B, a separation zone C and a drive zone D from the beginning to the end, and the running direction of the flat chain 24 in the upper region is from the beginning to the end. The flexible reaction net 3 is a mesh structure made of interwoven elastic wires or rods. Its two sides are fixed to two flat chains 24 via connecting mechanisms, and it moves in a circular motion along with the flat chains. The flexible reaction net 3 is made of stainless steel wire and can be arranged in a parallel pattern (e.g., ...). Figure 2 As shown), cross type (such as) Figure 3 The arrangement can be done in various ways (as shown), but is not limited to this material and arrangement method. All flexible scrapers 4 are flat strip-shaped elastic structures, arranged at intervals above the separation zone C, with one end fixed to the inner surface of the sealed shell 1 and the other end able to contact the flexible reaction net 3. The baffle 5 is arranged vertically above the flat chain 24 and along the running direction of the flat chain 24. Both ends are fixed to the opposite end faces of the sealed shell 1, and together they wrap the flexible reaction net 3 above the flat chain 24. Both the upper heating plate 6 and the lower heating plate 7 are flat plate structures and are arranged in the reaction zone B. The upper heating plate 6 is parallel and close to the upper surface of the sealed shell 1, and the lower heating plate 7 is arranged inside the chain drive mechanism 2 and close to the flat chain 24. Multiple microwave generators 8 are fixed on the outer surface of the sealed housing 1 above the driven zone A and the reaction zone B, and are used to emit microwaves of a specific frequency.

[0023] Specifically, two flat chains 24 are respectively close to one end face of the sealed outer shell 1; two driven wheels are fixed on both sides of the driven roller 21, which follow the rotation of the two flat chains 24 and restrict their movement position; multiple pairs of support rollers 22 in the reaction zone B and the separation zone C are arranged coaxially, each support roller 22 is equipped with a support wheel, and the two corresponding support wheels on both sides support the two flat chains 24 respectively. The support wheels and support rollers 22 are connected by bearings and can rotate freely; two drive wheels are fixed on both sides of the drive roller 23, which drive the two flat chains 24 to rotate respectively.

[0024] All driven rollers 21, support rollers 22 and drive rollers 23 are arranged in parallel on the same plane and have the same outer diameter. A flat chain 24 surrounds its outer surface to form an annular area. The driven rollers 21 and drive rollers 23 pass through the opposite end faces of the sealed housing 1 and are supported by the sealed housing 1 through bearings. One end of the drive roller 23 is connected to the drive system. The driven rollers 21 are equipped with a tensioning mechanism. Each pair of support rollers 22 passes through the opposite end faces of the sealed housing 1 and is fixed on the sealed housing 1.

[0025] Specifically, the feed inlet 11 is located at the top of the sealed shell 1 above the beginning of the reaction zone B, and is connected to the feeding system. Its width is smaller than the width of the reaction zone. The discharge outlet 12 is located at the bottom of the sealed shell 1 below the separation zone C, and is connected to the solid collection system. Its width is larger than the width of the separation zone. The gas outlet 13 is located at the top of the sealed shell 1 above the end of the reaction zone C, and is connected to the separation and condensation system.

[0026] Specifically, the flexible reactive mesh 3 is made of high-temperature resistant steel, molybdenum, tungsten or nickel, and its surface can be coated with wave-absorbing material; the flexible scraper 4 is a steel sheet.

[0027] Two links in opposite positions on a pair of flat chains 24 can be connected by thin rods to enhance synchronized movement.

[0028] The width of the baffle 5 is less than the gap between the flat chain 24 and the top of the sealed shell 1, the gap between the baffle 5 and the flat chain 24 is greater than 2mm, and the distance between the baffle 5 and the flexible reaction net 3 on the same side is greater than 2mm.

[0029] The upper heating plate 6 and the lower heating plate 7 are made of a microwave-absorbing material that can absorb microwaves of a specific frequency emitted by the microwave generator 8. The microwave-absorbing material is silicon carbide. The emission frequency of the microwave generator 8 is 12-18 GHz, preferably 15 GHz. The two ends of the lower heating plate 7 are respectively connected to the support rollers 22 on both sides; the difference between the spacing of the two flat chains 24 and the axial spacing of each pair of support rollers 22 does not exceed 50 mm.

[0030] At the top of the sealed shell 1, the interval between adjacent flexible scrapers 4 is at least 10 mm; the gap between the flexible reaction net 3 and the inner surface of the top of the sealed shell 1 is 20~100 mm, and the length of the flexible scraper 4 is 5~10 mm longer than this gap.

[0031] Example 2 A pyrolysis method, implemented based on the flexible chain microwave pyrolysis apparatus of Embodiment 1 above, includes the following steps: S1. Drive the drive roller 23 to rotate, which drives a pair of flat chain 24 and flexible reaction net 3 to move together at a set speed; start the microwave generator 8 to emit microwaves of a specific frequency and power into the driven zone A and the reaction zone B to heat the upper heating plate 6, the lower heating plate 7 and the flexible reaction net in the driven zone A and the reaction zone B to the set temperature. S2. Strip-shaped organic waste raw material enters the sealed shell 1 through the feed inlet 11 and falls onto the flexible reaction net 3 at the beginning of the reaction zone B. The temperature gradually rises, the raw material softens and sticks to the flexible reaction net 3 and undergoes pyrolysis. S3, the flexible reaction net 3 moves in a continuous ring with the flat chain 24, which drives the raw material from the beginning of reaction zone B to the end of reaction zone B and into separation zone C. The degree of pyrolysis gradually increases and pyrolysis gas is generated. S4. Inside the separation zone C, the flexible scraper 4 and the flexible reaction net 3 collide intermittently, generating elastic high-frequency vibration. Through vibration and scraping, the coke and waste residue remaining on the flexible reaction net 3 are peeled off. The waste residue passes through the flexible reaction net 3 under the action of gravity and is automatically discharged from the discharge port 12 and collected by the solid collection system. S5. The generated pyrolysis gas is discharged through outlet 13, and after condensation and separation, liquid products and non-condensable gases are collected.

[0032] Specifically, in step S1, the temperature is set to 300~800℃ and the rotation speed of the drive roller 23 is 1~20r / min.

[0033] In step S1, the emission power of the microwave generators in different regions can be adjusted to form a set temperature curve along the direction of raw material movement in the reaction zone.

[0034] In step S2, the strip-shaped organic waste includes waste paper strips, waste PET plastic thread, waste denim processing waste, or waste tire strips. The average length of the strip-shaped organic waste is 200-300mm, and it is directly fed into the device without crushing pretreatment.

[0035] Example 3 like Figure 1 As shown in the figure, the core structural parameters of the flexible chain microwave pyrolysis device in this embodiment are as follows: The chain drive mechanism has a width (distance between two flat chains) of 1000mm, a driven zone length of 200mm, a reaction zone length of 2000mm, a separation zone length of 400mm, a drive zone length of 200mm, and a flat chain width of 50mm; the discharge port width is 500mm; the reaction zone has 5 pairs of support rollers, and the separation zone has 1 pair of support rollers; the outer diameter of all drive rollers, driven rollers, and support rollers is 200mm; the axial spacing between each pair of support rollers is 950mm; the upper heating plate is 1700mm long and 1000mm wide, and the lower heating plate is 2000mm long and 900mm wide; the flexible reaction mesh is attached to the inner surface of the top of the sealed outer shell. The gap between them is 50mm; the gap between the baffle and the flat chain is 4mm; the distance between the baffle and the flexible reaction net is 4mm; the flexible scraper is a flat strip of elastic thin stainless steel sheet, 60mm long, 10mm wide, and 0.2mm thick; on the inner surface of the sealed shell above the separation zone, there are 7 flexible scrapers distributed longitudinally and 40 distributed transversely; on the outer surface of the sealed shell above the driven zone, there is a row of 5 microwave generators per row, and 4 rows of 5 microwave generators per row are arranged above the reaction zone; the upper heating plate and the lower heating plate are made of silicon carbide material, the microwave emission frequency of the microwave generator is 15GHz, and the surface of the flexible reaction net is sprayed with silicon carbide absorbing material.

[0036] Example 4 This embodiment uses a device with the above-mentioned basic structural parameters to perform pyrolysis of waste paper strips. The pyrolysis method steps are as follows: S1. Adjust the drive system to make the drive roller speed 4r / min, so that the flat chain and flexible reaction net move synchronously; start all microwave generators and adjust the microwave emission power of each area so that the temperature of the reaction zone rises from 400℃ to 500℃ from the beginning to the end. S2. Waste paper strips with an average length of 300mm are continuously fed into the sealed shell through the feeding system from the feed port. The waste paper strips fall on the flexible reaction net at the beginning of the reaction zone. While moving with the flexible reaction net, they are gradually heated in the gradient temperature environment, softened and bonded to the flexible reaction net and begin to pyrolyze. S3. Waste paper strips move gradually from the beginning to the end of the reaction zone along with the flexible reaction net, and the pyrolysis reaction continues, generating a large amount of pyrolysis gas. S4. After the flexible reaction net carries the pyrolysis residue into the separation zone, it intermittently collides with the spaced flexible scrapers. The flexible reaction net generates elastic high-frequency vibration. Under the action of vibration and scraping, the residue is separated from the flexible reaction net and falls through the flexible reaction net from the discharge port under the action of gravity, and is collected by the solid collection system. S5. The pyrolysis gas enters the separation and condensation system through the gas outlet, and is rapidly condensed and separated to collect the liquid phase products and non-condensable gases.

[0037] In this embodiment, the liquid phase yield of waste paper strip pyrolysis is 45.3%, of which the target product L-glucanone accounts for 9.6 wt% of the liquid phase product; after pyrolysis, there is no obvious residue adhesion on the surface of the flexible reaction net and no blockage inside the device, thus realizing the efficient disposal and utilization of waste paper strips.

[0038] Example 5 This embodiment uses the apparatus with the above-mentioned basic structural parameters to perform pyrolysis of PET waste plastic lines, only replacing the flexible reaction mesh with a cross-connected structure. The pyrolysis method steps are as follows: S1. Adjust the speed of the drive roller to 6r / min to drive the flat chain and the cross-connected flexible reaction net to move; start the microwave generator and adjust the power to make the temperature of the reaction zone gradually increase from 400℃ to 600℃ from the beginning to the end. S2. PET waste plastic wire with an average length of 200mm is fed into the device through the feed port and falls onto the flexible reaction net. As it moves and heats up, it softens and adheres to the cross nodes of the net, where it undergoes pyrolysis. S3 and PET waste plastic lines undergo gradual pyrolysis in the reaction zone, producing pyrolysis gas and solid residue; S4. After entering the separation zone, the flexible scraper collides with the cross-connected flexible reaction net, and the net vibrates to cause the residue to detach and be discharged and collected through the outlet. S5. The pyrolysis gas is separated by condensation, and the liquid phase products and non-condensable gases are collected.

[0039] In this embodiment, the liquid phase yield of PET waste plastic pyrolysis is 37.3%, and the yield of the target product benzoic acid reaches 26.8 wt%. There is no adhesive residue on the surface of the flexible reaction mesh, the device operates stably, and no blockage occurs.

[0040] Example 6 This embodiment uses a device with the above-mentioned basic structural parameters to pyrolyze waste denim processing materials. The number of flexible scrapers distributed laterally is adjusted to 35. The pyrolysis method steps are as follows: S1. Set the drive roller speed to 4r / min, start the microwave generator, and adjust the power to make the temperature of the reaction zone rise rapidly from 400℃ to 700℃ from the beginning to the end and keep it constant. S2. Waste denim processing waste (cotton) with an average length of 200mm is fed into the feed port and falls onto the flexible reaction net. After being heated, it adheres and undergoes a pyrolysis reaction. S3. The waste material undergoes deep pyrolysis in a constant temperature environment of 700℃, generating a large amount of pyrolysis gas. S4. The pyrolysis residue is separated in the separation zone by the scraping of the flexible scraper and the vibration of the screen, and is discharged from the outlet. S5. The pyrolysis gas is processed by a separation and condensation system to collect non-condensable fuel gas and a small amount of liquid products.

[0041] In this embodiment, the yield of non-condensable gas is 39.3%, and the proportion of H2 and CO in the gas composition is over 65%. The device operates stably during the pyrolysis process, with no raw material accumulation or blockage, thus realizing the efficient energy utilization of cotton waste.

[0042] Example 7 This embodiment uses a device with the above-mentioned basic structural parameters to perform pyrolysis of waste tire strips. The flexible reaction mesh is replaced with a large-gap parallel connection type. The pyrolysis method steps are as follows: S1. Adjust the drive roller speed to 6 r / min, start the microwave generator, and adjust the power to make the temperature of the reaction zone rise from 400℃ to 700℃ from the beginning to the end and then drop to 500℃, forming a "rise-fall" temperature curve. S2. Waste tire strips with an average length of 300mm are fed into the device through the feed inlet and fall onto the large-gap flexible reaction net. After softening, they are wrapped and bonded to the net body and undergo pyrolysis in the "rise-fall" temperature environment as the net body moves. S3. Waste tire strips undergo multi-stage pyrolysis reactions in the reaction zone, producing pyrolysis gas and solid residue; S4. After entering the separation zone, the residue is separated from the flexible reaction net by the action of the flexible scraper and discharged and collected through the outlet. S5. The pyrolysis gas is separated by condensation, and the liquid phase products and non-condensable gases are collected.

[0043] In this embodiment, the liquid phase yield of waste tire strip pyrolysis is 41.3%, and the proportion of target aromatic products in the liquid phase products is 15.3 wt%. There is no blockage during the operation of the device, and the flexible reaction network has a good cleaning effect, realizing the resource recycling of waste tire strips.

[0044] The above embodiments demonstrate that the device and pyrolysis method of the present invention can be adapted to the pyrolysis treatment of different types of strip-shaped organic waste, without the need for raw material pretreatment, with high pyrolysis efficiency, good product quality, stable operation, no clogging, and convenient maintenance, and have good practicality and industrialization prospects.

[0045] In summary, this invention eliminates the need for raw material pretreatment, reducing processing costs: large-sized strip-shaped organic waste can be directly fed into the device for pyrolysis without being crushed into particles, saving the need for additional pretreatment, stirring, and decoking equipment, simplifying the process flow, and reducing equipment investment and operating costs.

[0046] This invention can effectively prevent device blockage, ensure stable and reliable operation, and allow strip-shaped waste to soften and spontaneously adhere to the flexible reaction mesh after heating. The small contact area allows the pyrolysis residue to easily detach under the intermittent collision action of the flexible scraper. The baffle can prevent raw materials from falling into the reaction zone and sticking to the inner surface of the sealed shell, effectively avoiding blockage of the sealed shell and chain transmission mechanism, and ensuring continuous and smooth operation of the device.

[0047] This invention features highly efficient and energy-saving heating, a short reaction cycle, and microwaves that can directly penetrate and act on the upper and lower heating plates and the flexible reaction mesh, eliminating the need for heat conduction from the outside to the inside. This results in a fast heating rate, a small thermal gradient, and a shorter reaction cycle. The components below the chain drive mechanism, due to their distance or lack of microwave-absorbing materials, cannot effectively absorb microwaves, leading to minimal heat loss and energy savings.

[0048] This invention offers flexible temperature control and low thermal inertia. Under the action of the microwave absorbing material, microwave energy can be converted into heat in a timely manner without thermal hysteresis. It can quickly control the temperature of different areas and start and stop the equipment. It can form a suitable temperature curve according to the characteristics of the raw materials to ensure the pyrolysis effect.

[0049] This invention features controllable reaction time, high product quality, elastic contact between raw materials and flexible reaction mesh, and prevents severe vibrations in the separation zone from being transmitted to the reaction zone, thus avoiding accidental detachment of unreacted raw materials. The size of the reaction zone is easily adjustable, ensuring effective reaction time for raw materials and improving product conversion rate and quality.

[0050] The present invention has wide adaptability to raw materials and is easy to control. It can replace flexible reaction nets with different gaps and connection methods, as well as flexible scrapers with different sizes and layouts. It can also flexibly control parameters such as feeding speed, drive roller speed, microwave emission power and distribution, adapting to the high-efficiency pyrolysis requirements of different types of strip-shaped organic waste.

[0051] This invention features automatic slag discharge and convenient maintenance. There is no shaft obstruction below the separation zone, and the pyrolysis residue is automatically discharged from the discharge port under the action of flexible scraper and gravity, eliminating the need for manual cleaning and reducing maintenance costs and labor intensity.

[0052] The device of this invention is compact and has a high space utilization rate. The core mechanism is a chain drive mechanism, which is compact in structure. It directly heats the reaction zone with microwaves, eliminating the need for large heat exchange equipment, thus achieving high space utilization. Furthermore, the processing scale can be easily expanded by extending the reaction zone.

[0053] This invention enables clean emissions and is environmentally friendly. The pyrolysis process is conducted in an oxygen-free environment, producing reducing components such as H2 and CO. Furthermore, the low temperature inhibits the formation of harmful substances such as dioxins at the source, achieving efficient dechlorination and meeting environmental protection requirements.

[0054] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A flexible chain-type microwave pyrolysis device, characterized in that, The system includes a sealed outer shell, a chain drive mechanism, a flexible reaction net, multiple flexible scrapers, a pair of baffles, an upper heating plate, a lower heating plate, and multiple microwave generators. The sealed outer shell is a sealed hollow box structure, with an inlet, an outlet, and an outlet. The chain drive mechanism includes a pair of parallel, horizontally placed flat annular plates, as well as drive rollers, driven rollers, and multiple pairs of support rollers for supporting or traction. The upper region of the chain drive mechanism is divided into a driven zone, a reaction zone, a separation zone, and a drive zone from the beginning to the end. The flexible reaction net... The flexible reaction mesh is a mesh structure made of interwoven elastic wires or rods, with both sides fixed to the two flat chains; the flexible scraper is a flat strip-shaped elastic structure, arranged at intervals above the separation zone, with one end fixed to the inner surface of the sealed shell and the other end contacting the flexible reaction mesh; the baffle is arranged vertically above the flat chains and along the running direction of the flat chains, together wrapping the flexible reaction mesh; the upper heating plate and the lower heating plate are both arranged in the reaction zone, and the microwave generator is fixed to the outside of the sealed shell above the driven zone and the reaction zone.

2. The flexible chain microwave pyrolysis device according to claim 1, characterized in that, The two flat chains are respectively close to the opposite end faces of the sealed shell; the driven roller is provided with driven wheels on both sides of the axial direction, the support roller is provided with support wheels on both sides of the axial direction, and the drive roller is provided with drive wheels on both sides of the axial direction, each adapted to the two flat chains; all driven rollers, support rollers and drive rollers are arranged in parallel on the same plane and have the same outer diameter, and the flat chains form an annular area around their outer surface.

3. The flexible chain microwave pyrolysis device according to claim 1, characterized in that, The feed inlet is located at the top of the sealed shell above the first end of the reaction zone, and its width is less than the width of the reaction zone; the discharge outlet is located at the bottom of the sealed shell below the separation zone, and its width is greater than the width of the separation zone; the air outlet is located at the top of the sealed shell above the end of the reaction zone.

4. The flexible chain microwave pyrolysis device according to claim 1, characterized in that, The flexible reaction mesh is made of high-temperature resistant steel, molybdenum, tungsten, or nickel; the flexible scraper is a steel sheet, and the interval between adjacent flexible scrapers is at least 10 mm.

5. The flexible chain microwave pyrolysis device according to claim 1, characterized in that, The width of the baffle is less than the gap between the flat chain and the top of the sealed shell, the gap between the baffle and the flat chain is greater than 2mm, and the distance between the baffle and the flexible reaction net on the same side is greater than 2mm.

6. The flexible chain microwave pyrolysis device according to claim 1, characterized in that, The upper heating plate and the lower heating plate are made of microwave-absorbing material, which is silicon carbide; the two ends of the lower heating plate are connected to the support rollers on both sides, and the difference between the distance between the two flat chains and the axial distance between each pair of support rollers does not exceed 50mm.

7. The flexible chain microwave pyrolysis device according to claim 1, characterized in that, The microwave generator has a transmission frequency of 12-18 GHz; the gap between the flexible reaction mesh and the inner surface of the top of the sealed shell is 20-100 mm, and the length of the flexible scraper is 5-10 mm longer than this gap.

8. The flexible chain microwave pyrolysis device according to claim 1, characterized in that, Two links on a pair of flat chains that are positioned opposite each other are connected by a thin rod; the driven roller is equipped with a tensioning mechanism, and one end of the drive roller that extends out of the sealed housing is connected to the drive system.

9. A pyrolysis method, characterized in that, The implementation based on the flexible chain microwave pyrolysis apparatus according to any one of claims 1-8 includes the following steps: S1. Drive the drive roller to rotate, which in turn drives the flat chain and flexible reaction net to move at a set speed. Start the microwave generator to heat the upper heating plate, lower heating plate and flexible reaction net to 300~800℃. S2. Strip-shaped organic waste enters from the feed inlet and falls onto the flexible reaction net at the beginning of the reaction zone, where it softens, adheres, and undergoes pyrolysis. S3. The raw material moves to the separation zone along the flexible reaction net and pyrolyzes to produce pyrolysis gas. S4. The flexible scraper vibrates upon colliding with the flexible reaction mesh, peeling off the residue and discharging it through the outlet. S5. The pyrolysis gas is discharged through the outlet, and after condensation and separation, the liquid products and non-condensable gases are collected.

10. The pyrolysis method according to claim 9, characterized in that, In step S1, the rotation speed of the drive roller is 1~20 r / min, and the reaction zone forms a set temperature curve by adjusting the power of the microwave generator; the strip-shaped organic waste is waste paper strips, PET waste plastic thread, waste denim processing waste or waste tire strips, with an average length of 200~300 mm.

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