External double-layer flexible rotary pyrolysis device and pyrolysis method thereof

Abstract

This application discloses an external double-layer flexible rotary pyrolysis device and its pyrolysis method. The pyrolysis furnace has a cavity, with a feed inlet at the top that connects to the cavity. An outer flexible reaction cage is located within the cavity and rotatably connected to the pyrolysis furnace. An inner flexible reaction cage is located inside the outer flexible reaction cage. Both the outer and inner scraper assemblies are located within the cavity, with the outer scraper assembly in contact with the outer flexible reaction cage and the inner scraper assembly in contact with the inner flexible reaction cage. A driving mechanism drives the inner and outer flexible reaction cages to rotate in the same direction. By setting a double-layer nested structure of inner and outer flexible reaction cages, this application allows the material to complete a two-stage pyrolysis process sequentially in the outer and inner layers. This achieves a processing path equivalent to a multi-stage reaction within a single pyrolysis furnace, effectively extending the material's reaction residence time and significantly improving the sufficiency and thoroughness of the pyrolysis.

Description

Technical Field

[0001] This application relates to the field of pyrolysis technology, specifically to an external double-layer flexible rotary pyrolysis device and its pyrolysis method. Background Technology

[0002] Organic waste pyrolysis technology has been widely applied in the treatment of agricultural and forestry waste, waste plastics, waste rubber, textile waste, and other materials due to its ability to achieve harmless, volume-reduced, and resource-based treatment. Traditional horizontal / vertical pyrolysis devices mostly adopt a single-layer reaction chamber or single-layer reaction cage structure. The material can only complete a single heating process within the device, resulting in a short reaction path and limited effective residence time. This makes it difficult to ensure the complete decomposition of large-sized, highly tough, and difficult-to-pyrolyze materials, and easily leads to problems such as incomplete pyrolysis, high organic matter content in the residue, and unstable product quality.

[0003] To extend the residence time of materials and improve the sufficiency of pyrolysis, existing technologies typically employ methods such as increasing the size of the equipment, connecting multiple pyrolysis units in series, or extending the length of the reaction chamber. However, these solutions significantly increase the equipment footprint, manufacturing costs, and operating energy consumption, resulting in a bulky pyrolysis system structure and low space utilization, which is not conducive to miniaturization and distributed application.

[0004] Therefore, existing pyrolysis equipment still suffers from technical defects such as insufficient residence time, incomplete pyrolysis, large equipment size, and low space utilization, making it difficult to achieve long-term, high-efficiency, and high-conversion pyrolysis reactions of materials in a compact space.

[0005] In view of this, the present invention is hereby proposed. Summary of the Invention

[0006] To address the aforementioned technical problems, this invention provides an external double-layer flexible rotary pyrolysis device and its pyrolysis method.

[0007] This application provides the following technical solution:

[0008] In a first aspect, embodiments of this application provide an external double-layer flexible rotary pyrolysis device, comprising:

[0009] A pyrolysis furnace having a cavity, with a feed inlet at the top of the pyrolysis furnace communicating with the cavity;

[0010] An outer flexible reaction cage is located inside the cavity and is rotatably connected to the pyrolysis furnace.

[0011] An inner flexible reaction cage is located inside the outer flexible reaction cage. The inner flexible reaction cage is rotatably connected to the pyrolysis furnace. The rotation axes of the inner and outer flexible reaction cages are collinear.

[0012] Both the outer scraper assembly and the inner scraper assembly are disposed within the cavity. The outer scraper assembly is in contact with the outer flexible reaction cage, and the inner scraper assembly is in contact with the inner flexible reaction cage.

[0013] A driving mechanism is provided, which is in transmission cooperation with the outer flexible reaction cage and the inner flexible reaction cage respectively, to drive the inner flexible reaction cage and the outer flexible reaction cage to rotate in the same direction.

[0014] Optionally, both the outer flexible reaction cage and the inner flexible reaction cage include multiple flexible wires, and each flexible wire is arranged circumferentially around the axis of rotation.

[0015] The gap between the flexible filaments (inner flexible filaments) of the inner flexible reaction cage is smaller than the gap between the flexible filaments (outer flexible filaments) of the outer flexible reaction cage.

[0016] Optionally, the outer scraper assembly is disposed on the inner wall of the pyrolysis furnace;

[0017] The outer scraper assembly is located on top of the inner flexible reaction cage;

[0018] The material stripped from the outer flexible reaction cage by the outer scraper assembly can fall into the inner flexible reaction cage.

[0019] Optionally, the axis of rotation is located on a vertical center plane, and the vertical center plane is perpendicular to the horizontal plane;

[0020] The feed inlet and the outer scraper assembly are respectively located on both sides of the vertical center plane, and both the feed inlet and the outer scraper assembly are close to the vertical center plane.

[0021] Optionally, an annular cavity is provided between the outer flexible reaction cage and the inner flexible reaction cage, and the inner scraper assembly is at least partially located within the annular cavity;

[0022] The projection of the outer scraper assembly onto the inner flexible reaction cage is offset from that of the inner scraper assembly.

[0023] Optionally, a reaction zone and a separation zone are sequentially arranged circumferentially along the axis of rotation within the cavity;

[0024] The bottom of the pyrolysis furnace is provided with a discharge port, which is located in the separation zone, and the feed port is located in the reaction zone;

[0025] Both the outer scraper assembly and the inner scraper group are located in the separation zone;

[0026] Both the outer and inner flexible reaction cages drive the material to rotate from the reaction zone to the separation zone.

[0027] Optionally, the driving mechanism includes a first driving member and a second driving member;

[0028] The first driving member and the second driving member are respectively disposed at both ends of the pyrolysis furnace along the rotation axis;

[0029] The first driving member is connected to the outer flexible reaction cage to drive the outer flexible reaction cage to rotate;

[0030] The second driving component is connected to the inner flexible reaction cage to drive the inner flexible reaction cage to rotate.

[0031] Optionally, the outer flexible reaction cage includes an outer main end plate, an outer slave end plate, and outer flexible wires, with each of the outer flexible wires arranged sequentially around the outer main end plate in the circumferential direction, and the two ends of each outer flexible wire being connected to the outer main end plate and the outer slave end plate, respectively.

[0032] The inner flexible reaction cage includes an inner main end plate, an inner secondary end plate, and inner flexible wires. Each inner flexible wire is arranged sequentially around the inner main end plate in the circumferential direction, and the two ends of each inner flexible wire are respectively connected to the inner main end plate and the inner secondary end plate. The inner main end plate and the inner secondary end plate are located between the outer main end plate and the outer secondary end plate, and the outer main end plate and the inner main end plate are located on opposite sides of the pyrolysis furnace.

[0033] The first driving member is rotatably disposed on the pyrolysis furnace and connected to the outer main end plate;

[0034] The second driving member is rotatably disposed in the pyrolysis furnace and rotatably passes through the outer slave end plate and is connected to the inner master end plate.

[0035] Optionally, the external double-layer flexible rotary pyrolysis device includes a fixed shaft;

[0036] The fixed shaft extends along the axis of rotation;

[0037] Both the outer main end plate and the inner slave end plate are rotatably sleeved on the fixed shaft;

[0038] The first driving component is a cylindrical body, which is rotatably sleeved on the fixed shaft.

[0039] Secondly, the pyrolysis method of the external double-layer flexible rotary pyrolysis device includes:

[0040] Step S1: The driving mechanism drives the inner flexible reaction cage and the outer flexible reaction cage to rotate in the same direction, while heating the pyrolysis furnace to the set temperature.

[0041] Step S2: The raw material is fed into the outer flexible reaction cage through the feed port. As the temperature rises, the material softens and adheres to the outer flexible reaction cage and undergoes pyrolysis.

[0042] Step S3: The outer flexible reaction cage rotates, driving the material from the reaction zone into the separation zone. In the separation zone, the material is peeled off by the outer scraper assembly. At least part of the peeled material falls onto the inner flexible reaction cage and rotates with the inner flexible reaction cage.

[0043] Step S4: The inner flexible reaction cage rotates, driving the material from the reaction zone into the separation zone, and the material is peeled off in the separation zone by the inner scraper assembly.

[0044] By adopting the above technical solution, the present invention has the following beneficial effects:

[0045] This application sets up a double-layer nested structure of an inner flexible reaction cage and an outer flexible reaction cage, so that the material completes a two-stage pyrolysis process in the outer and inner layers in sequence. This achieves a processing path equivalent to a multi-stage reaction in a single pyrolysis furnace, effectively extending the reaction residence time of the material and significantly improving the sufficiency and thoroughness of the pyrolysis.

[0046] The specific embodiments of the present invention will be described in further detail with reference to the accompanying drawings. Attached Figure Description

[0047] The accompanying drawings, which form part of this application, are used to provide a further understanding of the invention. The illustrative embodiments and descriptions of the invention are used to explain the invention, but do not constitute an undue limitation of the invention. Obviously, the drawings described below are merely some embodiments, and those skilled in the art can obtain other drawings based on these drawings without creative effort. In the drawings:

[0048] Figure 1 This is a front view cross-sectional structural schematic diagram of the external double-layer flexible rotary pyrolysis device provided in the embodiment of this application;

[0049] Figure 2 A top-view cross-sectional structural diagram of the external double-layer flexible rotary pyrolysis device provided in the embodiments of this application;

[0050] Figure 3 This is a side view of the cross-sectional structure of the external double-layer flexible rotary pyrolysis device provided in the embodiment of this application.

[0051] Figure 4 This is a schematic diagram of the flexible reaction cage of the external double-layer flexible rotary pyrolysis device provided in the embodiments of this application.

[0052] In the diagram: 1. Feed inlet; 2. First driving component; 3a. Outer flexible reaction cage; 3b. Inner flexible reaction cage; 4. Discharge outlet; 5. Pyrolysis furnace; 6. Second driving component; 7. Flexible scraper; 8. Gas outlet; 9. Inner support; 10. Fixed shaft; 31. Flexible wire; 32. Wing; 33. Support rod; 34. Outer main end plate; 35. Outer secondary end plate; 36. Inner main end plate; 37. Inner secondary end plate; A. Reaction zone; B. Separation zone.

[0053] It should be noted that these accompanying drawings and textual descriptions are not intended to limit the scope of the invention in any way, but rather to illustrate the concept of the invention to those skilled in the art by referring to specific embodiments. Detailed Implementation

[0054] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments will be clearly and completely described below with reference to the accompanying drawings. The following embodiments are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0055] In the description of this invention, it should be noted that the terms "upper", "lower", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0056] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation" and "connection" 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 mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0057] See Figures 1 to 4As shown in the figure, this application provides an external double-layer flexible rotary pyrolysis device, including: a pyrolysis furnace 5, an outer flexible reaction cage 3a, an inner flexible reaction cage 3b, an outer scraper assembly, an inner scraper assembly, and a drive mechanism. The pyrolysis furnace 5 has a cavity, and a feed inlet 1 is provided at the top of the pyrolysis furnace 5, which communicates with the cavity. An outer flexible reaction cage 3a is located inside the cavity and is rotatably connected to the pyrolysis furnace 5. An inner flexible reaction cage 3b is located inside the outer flexible reaction cage 3a and is rotatably connected to the pyrolysis furnace 5. The rotation axes of the inner flexible reaction cage 3b and the outer flexible reaction cage 3a are collinear. Both the outer scraper assembly and the inner scraper assembly are disposed inside the cavity. The outer scraper assembly is in contact with the outer flexible reaction cage 3a, and the inner scraper assembly is in contact with the inner flexible reaction cage 3b. A driving mechanism is in transmission cooperation with the outer flexible reaction cage 3a and the inner flexible reaction cage 3b respectively, driving the inner flexible reaction cage 3b and the outer flexible reaction cage 3a to rotate in the same direction.

[0058] This application sets up a double-layer nested structure of inner flexible reaction cage 3b and outer flexible reaction cage 3a, so that the material completes a two-stage pyrolysis process in the outer and inner layers in sequence. In a single pyrolysis furnace 5, a processing path equivalent to a multi-stage reaction is realized, which effectively extends the reaction residence time of the material and significantly improves the sufficiency and thoroughness of the pyrolysis of the material.

[0059] As the supporting and sealed reaction vessel for the entire device, the structural design of the pyrolysis furnace 5 directly determines the stability and safety of the pyrolysis reaction. The pyrolysis furnace 5 can be a horizontally placed hollow cylindrical structure, forming a sealed pyrolysis cavity inside. This cavity provides a stable oxygen-free (or low-oxygen) reaction environment for the pyrolysis of materials, effectively inhibiting the formation of harmful substances such as dioxins, while reducing heat loss and improving heat utilization efficiency.

[0060] A feed inlet 1 is provided at the top of the pyrolysis furnace 5. The feed inlet 1 is interconnected with the cavity inside the pyrolysis furnace 5. The size of the feed inlet 1 is precisely designed to ensure that strip-shaped organic waste (such as waste paper strips, waste tire strips, waste PET plastic threads, etc.) can be smoothly and continuously fed into the device, while preventing problems such as material accumulation and spillage during feeding, ensuring that the material falls accurately onto the subsequent outer flexible reaction cage 3a. In addition, heat exchange flues or independent temperature control devices (such as electromagnetic heating systems) can be arranged on the outside of the pyrolysis furnace 5 according to actual needs to regulate the temperature inside the cavity and meet the pyrolysis temperature requirements of different materials.

[0061] The outer flexible reaction cage 3a is the core carrier for material pyrolysis. It is located entirely within the cavity of the pyrolysis furnace 5 and can rotate around its own axis via a bearing structure. It can be directly or indirectly connected to the furnace body of the pyrolysis furnace 5, ensuring smooth and uninterrupted rotation. Simultaneously, it must maintain a tight seal between itself and the furnace body to prevent pyrolysis gas leakage through the connection gap. The inner flexible reaction cage 3b forms a double-nested structure with the outer flexible reaction cage 3a. It is located inside the outer flexible reaction cage 3a and can also rotate around its own axis via a bearing structure. The inner flexible reaction cage 3b is directly or indirectly connected to the furnace body of the pyrolysis furnace 5, and the rotation axes of the inner and outer flexible reaction cages 3a are completely collinear, ensuring that they do not interfere with each other during rotation. This achieves synchronous and unidirectional rotation while ensuring that the material can smoothly fall from the outer layer to the inner layer.

[0062] Both the outer scraper assembly and the inner scraper assembly are fixedly installed in the cavity of the pyrolysis furnace 5. Their core function is to scrape and collide with the mesh surface of the reaction cage during the rotation of the reaction cage, peel off the unpyrolyzed material, coke and waste residue that are stuck to the flexible wire 31, prevent the reaction cage from being blocked and ensure that the pyrolysis process is continuous and stable.

[0063] Both the outer flexible reaction cage 3a and the inner flexible reaction cage 3b include multiple flexible wires 31, and each flexible wire 31 is arranged circumferentially around the rotation axis.

[0064] The drive mechanism, as the power source of the entire device, forms a transmission connection with the outer flexible reaction cage 3a and the inner flexible reaction cage 3b respectively. It can independently drive both to rotate in the same direction at a set speed. Specifically, the drive mechanism can include two independent external drive systems, one connected to the outer flexible reaction cage 3a and the other connected to the inner flexible reaction cage 3b. The two drive systems can independently adjust their speed (the speed range is 1~20 r / min). According to the material characteristics and pyrolysis requirements, the rotation speed of the outer and inner flexible reaction cages 3b can be flexibly adjusted to control the residence time of the material in the two-stage pyrolysis process and ensure sufficient pyrolysis.

[0065] Within the cavity of the pyrolysis furnace 5, a reaction zone A and a separation zone B are sequentially arranged circumferentially along the rotation axis. A discharge port 4 is located at the bottom of the pyrolysis furnace 5, situated within the separation zone B. A feed inlet 1 is located at the top of the pyrolysis furnace 5, situated within the reaction zone A. The feed inlet 1 can be at the beginning of the reaction zone A. The discharge port 4 is located at the beginning of the separation zone B. Both the outer scraper assembly and the inner scraper assembly are located within the separation zone B. The outer flexible reaction cage 3a and the inner flexible reaction cage 3b both drive the material to rotate from the reaction zone A to the separation zone B.

[0066] The pyrolysis furnace 5 includes a sealed outer shell, which can be a horizontally placed hollow cylindrical structure. The sealed outer shell is provided with a feed inlet 1, a discharge outlet 4, and a gas outlet 8. Inside the sealed outer shell, it is divided into two parts, a reaction zone A and a separation zone B, on a vertical plane passing through the axis of rotation. The top of the reaction zone A and the bottom of the separation zone B are the beginning and end of their respective regions, respectively.

[0067] During operation, the strip-shaped organic waste to be processed is fed into the feed port 1 at the top of the pyrolysis furnace 5, precisely landing on the mesh surface of the rotating outer flexible reaction cage 3a. As the outer flexible reaction cage 3a rotates, the material is carried into the reaction zone A of the pyrolysis furnace 5, where it softens under high temperature. Due to the structural characteristics of the flexible filaments 31, the material spontaneously adheres to the flexible filaments 31, and a pyrolysis reaction begins. The pyrolysis vapor generated during the pyrolysis process flows through the mesh gaps into the cavity of the pyrolysis furnace 5 and is finally discharged through the gas outlet 8. When the outer flexible reaction cage 3a rotates to the separation zone B, the outer scraper assembly intermittently collides with the flexible filaments 31 of the outer flexible reaction cage 3a. Using elastic high-frequency vibration and scraping action, the incompletely pyrolyzed material adhering to the flexible filaments 31 is peeled off, while the residual coke and slag from the pyrolysis are broken up. The peeled incompletely pyrolyzed material falls onto the inner flexible reaction cage 3b, which rotates coaxially below, under the action of gravity, and enters the secondary pyrolysis stage.

[0068] The inner flexible reaction cage 3b continues to rotate, carrying the incompletely pyrolyzed material through the entire reaction zone A, and continues the pyrolysis reaction in a high-temperature environment until the material is completely pyrolyzed and transformed into coke and waste residue. When the inner flexible reaction cage 3b rotates to the middle of the separation zone B, the inner scraper assembly intermittently collides with the flexible wires 31 of the inner flexible reaction cage 3b, peeling off the residual coke and waste residue. Under the action of gravity, these residues pass through the mesh gaps of the inner flexible reaction cage 3b and are finally discharged from the discharge port 4 at the bottom of the pyrolysis furnace 5, completing the entire pyrolysis process.

[0069] Compared to traditional pyrolysis devices, the core advantage of this double-layer nested structure lies in the fact that it achieves a processing path equivalent to a multi-stage reaction within a single pyrolysis furnace 5, eliminating the need for multiple pyrolysis furnaces 5 connected in series. This effectively reduces equipment size, improves space utilization, lowers equipment costs and floor space, and facilitates equipment miniaturization and distributed applications. Simultaneously, the material sequentially undergoes primary pyrolysis in the outer layer and secondary pyrolysis in the inner layer, significantly extending the residence time of the material in the high-temperature reaction zone A. This solves the problems of incomplete pyrolysis and large residues in traditional devices, greatly improving the sufficiency and thoroughness of material pyrolysis, and increasing the pyrolysis conversion rate and the yield of the target product.

[0070] In some possible implementations, both the outer flexible reaction cage 3a and the inner flexible reaction cage 3b include multiple flexible wires 31, which are arranged circumferentially around the axis of rotation. The gap between the flexible wires 31 in the inner flexible reaction cage 3b is smaller than the gap between the flexible wires 31 in the outer flexible reaction cage 3a.

[0071] The strip-shaped organic waste to be processed is fed into the feed port 1 at the top of the pyrolysis furnace 5 and falls precisely onto the mesh surface of the rotating outer flexible reaction cage 3a. It is worth noting that both the outer flexible reaction cage 3a and the inner flexible reaction cage 3b include multiple flexible wires 31. Each flexible wire 31 is arranged circumferentially around the rotation axis to form a complete mesh bearing surface. The core design difference is that the gap between the flexible wires 31 in the inner flexible reaction cage 3b is smaller than the gap between the flexible wires 31 in the outer flexible reaction cage 3a. This gap difference is not set arbitrarily, but is precisely designed in combination with the functional requirements of two-stage pyrolysis and changes in material state. The specific details and functions are as follows: The gap design of the flexible wires 31 of the outer flexible reaction cage 3a is relatively large. On the one hand, it can ensure that when strip-shaped organic waste (such as waste paper strips, waste tire strips, PET waste plastic threads, etc.) is put in, it can fall smoothly onto the flexible wires 31 without the material getting stuck or piling up due to the gap being too small. At the same time, it reserves enough space for the rapid flow of pyrolysis steam generated during the pyrolysis process, avoiding steam stagnation that affects the pyrolysis efficiency. On the other hand, as the first-stage pyrolysis carrier, the material is in the initial pyrolysis state and has a relatively large volume. The larger gap of the flexible wires 31 can reduce the excessive adhesion between the material and the flexible wires 31, making it easier for the subsequent outer scraper assembly to peel off the material that has not been completely pyrolyzed. The inner flexible reaction cage 3b has a smaller gap design for its flexible wires 31. Its core purpose is to receive the incompletely pyrolyzed material stripped from the outer layer. After primary pyrolysis, the material volume will decrease. If the gap between the inner and outer layers were the same, some small, incompletely pyrolyzed materials might fall directly through the gaps in the inner layer, failing to enter the secondary pyrolysis stage, resulting in incomplete pyrolysis. The smaller gaps in the inner layer can support these relatively large, incompletely pyrolyzed materials, ensuring they can rotate with the inner flexible reaction cage 3b and pass completely through reaction zone A again to complete the secondary pyrolysis, while not affecting the flow of pyrolysis steam and the final discharge of residue.

[0072] When the outer flexible reaction cage 3a rotates to the separation zone B, the outer scraper assembly intermittently collides with the flexible wires 31 of the outer flexible reaction cage 3a. Utilizing elastic high-frequency vibration and scraping action, the incompletely pyrolyzed material adhering to the flexible wires 31 is peeled off, while the residual coke and slag from pyrolysis are broken up. At this time, thanks to the smaller gap between the flexible wires of the inner flexible reaction cage 3b, the incompletely pyrolyzed material (regardless of size) after peeling off can fall smoothly onto the inner flexible reaction cage 3b rotating coaxially below under the action of gravity. There will be little or no leakage of large pieces of incompletely pyrolyzed material, which would prevent the material from entering the secondary pyrolysis stage.

[0073] The inner flexible reaction cage 3b continues to rotate, carrying the incompletely pyrolyzed material through the entire reaction zone A, continuing the pyrolysis reaction at high temperature until the material is completely pyrolyzed, transforming into coke and waste residue. At this point, the small gap design of the inner flexible wires 31 comes into play again; the coke and waste residue after complete pyrolysis are mostly fine particles, which can easily pass through the small gaps. When the inner flexible reaction cage 3b rotates to the middle of the separation zone B, the inner scraper assembly intermittently collides with the flexible wires 31 of the inner flexible reaction cage 3b, peeling off the remaining coke and waste residue. These residues, under the action of gravity, smoothly pass through the mesh gaps of the inner flexible reaction cage 3b and are finally discharged from the discharge port 4 at the bottom of the pyrolysis furnace 5, completing the entire pyrolysis process. In addition, both the inner and outer flexible wires 31 are arranged circumferentially around the axis of rotation to ensure the uniformity of the mesh surface, so that the material can obtain a uniform heating area and bearing effect no matter where it falls on the flexible reaction cage, further improving the uniformity and thoroughness of pyrolysis and avoiding pyrolysis dead zones caused by uneven local gaps.

[0074] In some possible implementations, the outer scraper assembly is disposed on the inner wall of the pyrolysis furnace 5, and the outer scraper assembly is located at the top of the inner flexible reaction cage 3b, that is, near the feed inlet 1, so that the material peeled off by the outer scraper assembly on the outer flexible reaction cage 3a can fall naturally into the inner flexible reaction cage 3b.

[0075] The position of the outer scraper assembly is not randomly selected, but precisely planned in combination with the material movement path and the requirements of the two-stage pyrolysis connection. Its core purpose is to ensure that the material peeled off by the outer scraper assembly on the outer flexible reaction cage 3a can fall naturally to the inner flexible reaction cage 3b, so as to achieve a seamless connection between the two-stage pyrolysis.

[0076] First, in terms of layout, the outer scraper assembly is fixed to the inner wall of the pyrolysis furnace 5 and precisely corresponds to the top area of ​​the inner flexible reaction cage 3b, near the feed inlet 1. This position is exactly above the end of the separation zone B of the outer flexible reaction cage 3a's rotation trajectory, and is in close contact with the mesh surface of the outer flexible reaction cage 3a. When the outer flexible reaction cage 3a, carrying the material that has undergone primary pyrolysis, rotates from the end of the reaction zone A to the separation zone B, its mesh surface just moves to the installation position of the outer scraper assembly. At this time, the scraper assembly intermittently collides with the rotating flexible wire 31, achieving material separation. Simultaneously, since the outer scraper assembly is roughly located directly above the inner flexible reaction cage 3b, the two form a vertical correspondence, and the inner flexible reaction cage 3b and the outer flexible reaction cage 3a rotate coaxially, with their rotation trajectories corresponding to each other, providing a stable path for the natural fall of the separated material.

[0077] Secondly, from the perspective of material connection logic, this design perfectly matches the material's state changes and the connection requirements of the two-stage pyrolysis: after the first-stage pyrolysis, the material has softened from its initial long strip shape, partially pyrolyzed, and its volume has decreased. Furthermore, through the collision and peeling by the outer scraper assembly, it forms dispersed, incompletely pyrolyzed material particles or small pieces. Because the outer scraper assembly is close to the feed inlet 1 and located at the top of the inner flexible reaction cage 3b, the peeled material, under the action of gravity, falls naturally without additional guiding structures and accurately lands on the mesh surface of the rotating inner flexible reaction cage 3b below. Combined with the smaller gaps in the flexible wires 31 of the inner flexible reaction cage 3b mentioned earlier, it can firmly support the relatively small volume of unpyrolyzed material falling from the outer layer, preventing insufficiently pyrolyzed material from leaking through the gaps. This ensures that all peeled, incompletely pyrolyzed material can enter the second-stage pyrolysis stage, completely solving the problems of poor material connection and incomplete pyrolysis in traditional devices.

[0078] During operation, when the outer flexible reaction cage 3a rotates to the separation zone B and contacts the outer scraper assembly, the scraper assembly, through elastic collision and scraping, completely peels off the incompletely pyrolyzed material adhering to the flexible wires 31. Under gravity, the peeled material falls naturally from the top of the inner flexible reaction cage 3b, where the outer scraper assembly is located, onto the rotating inner flexible reaction cage 3b below. Since the inner flexible reaction cage 3b is rotating, the falling material is evenly distributed on its mesh surface and enters the reaction zone A with the inner reaction cage to complete the subsequent secondary pyrolysis. This positional design, combined with the gap design between the inner and outer flexible wires 31, forms a seamless connection between "peeling-receiving-secondary pyrolysis," ensuring complete pyrolysis of the material, simplifying the device structure, and improving operational stability.

[0079] In some possible implementations, the rotation axis is located on a vertical center plane, which is perpendicular to the horizontal plane. The feed inlet 1 and the outer scraper assembly are respectively located on both sides of the vertical center plane, and both the feed inlet 1 and the outer scraper assembly are close to the vertical center plane. The feed inlet 1 being close to the vertical center plane facilitates the material falling directly onto the outer flexible reaction cage 3a through the feed inlet 1. The outer scraper assembly being close to the feed inlet 1 allows it to be positioned approximately directly above the inner flexible reaction cage 3b, which facilitates the smooth falling of the detached material into the inner flexible reaction cage 3b. By separating the feed inlet 1 and the outer scraper assembly on both sides of the vertical center plane, the issues of feeding and dropping are comprehensively considered.

[0080] In some possible implementations, an annular cavity is provided between the outer flexible reaction cage 3a and the inner flexible reaction cage 3b, and the inner scraper assembly is at least partially located in the annular cavity. The projection of the outer scraper assembly onto the inner flexible reaction cage 3b is offset from the inner scraper assembly to prevent the material peeled off by the outer scraper assembly from falling onto the inner scraper assembly.

[0081] An annular cavity exists between the outer flexible reaction cage 3a and the inner flexible reaction cage 3b. This annular cavity is formed by the gap between the inner wall of the outer flexible reaction cage 3a and the outer wall of the inner flexible reaction cage 3b. Its width is adapted to the difference in outer diameter between the inner and outer reaction cages and is an important component of the internal structural layout of the device. It also serves multiple functions, including material transfer, pyrolysis steam flow, and scraper assembly installation. The width of the annular cavity is precisely designed to provide sufficient space for the installation of the inner scraper assembly, ensuring its normal operation without interfering with the outer flexible reaction cage 3a. It also ensures that the material peeled from the outer layer falls smoothly and accurately onto the inner reaction cage, while providing a channel for the flow of pyrolysis steam between the inner and outer reaction cages, preventing steam stagnation and ensuring a stable and efficient pyrolysis process. In this application, the projection of the outer scraper assembly onto the inner flexible reaction cage 3b is offset from the inner scraper assembly itself, preventing material peeled from the outer scraper assembly from falling onto the inner scraper assembly. Specifically, "projection offset" means that the outer scraper assembly and the inner scraper assembly are arranged in a staggered manner around the pyrolysis furnace 5. When the outer scraper assembly is projected radially onto the outer peripheral surface of the inner flexible reaction cage 3b, its projection area does not overlap with the actual installation area of ​​the inner scraper assembly, and a certain distance is maintained between the two.

[0082] In practical applications, if the projections of the two layers overlap, some of the incompletely pyrolyzed material peeled off by the outer scraper assembly may fall onto the inner scraper assembly during its descent under gravity. Since the outer surface of the inner scraper assembly is smooth and fixed, the material falling onto it cannot be effectively supported. It may either slide off the scraper assembly surface to the discharge port 4 at the bottom of the pyrolysis furnace 5, resulting in the direct discharge of incompletely pyrolyzed material, causing incomplete pyrolysis and material waste; or it may adhere to the scraper assembly, causing blockage between the inner and outer reaction cages, affecting the flow of pyrolysis steam, and even leading to equipment jamming or malfunction. The staggered projection design completely solves the above problems: the material peeled off by the outer scraper assembly falls vertically to the top area of ​​the inner flexible reaction cage 3b under the action of gravity. Due to the staggered projection, the falling path is not blocked by the inner scraper assembly, and the material can fall directly onto the mesh surface of the inner reaction cage. Combined with the small gap design of the inner flexible wire 31, it is supported by the inner flexible reaction cage 3b and enters the reaction zone A with the inner flexible reaction cage 3b to complete the secondary pyrolysis.

[0083] In some possible implementations, the driving mechanism includes a first driving member 2 and a second driving member 6, which are respectively disposed at both ends of the pyrolysis furnace 5 along the rotation axis. The first driving member 2 is connected to the outer flexible reaction cage 3a to drive the outer flexible reaction cage 3a to rotate, and the second driving member 6 is connected to the inner flexible reaction cage 3b to drive the inner flexible reaction cage 3b to rotate.

[0084] The outer flexible reaction cage 3a includes an outer main end plate 34, an outer slave end plate 35, and outer flexible wires. Each of the outer flexible wires is arranged sequentially around the outer main end plate 34, and both ends of each outer flexible wire are connected to the outer main end plate 34 and the outer slave end plate 35, respectively. The inner flexible reaction cage 3b includes an inner main end plate 36, an inner slave end plate 37, and inner flexible wires. Each of the inner flexible wires is arranged sequentially around the inner main end plate 36, and both ends of each inner flexible wire are connected to the inner main end plate 36. The pyrolysis furnace includes a main end plate 36 and an inner slave end plate 37, located between the outer main end plate 34 and the outer slave end plate 35. The outer main end plate 34 and the inner main end plate 36 are located on opposite sides of the pyrolysis furnace. A first driving member 2 is rotatably mounted on the pyrolysis furnace 5 and connected to the outer main end plate 34. A second driving member 6 is rotatably mounted on the pyrolysis furnace 5 and rotatably passes through the outer slave end plate 35 and is connected to the inner main end plate 36. The external double-layer flexible rotary pyrolysis device includes a fixed shaft 10 extending along the rotation axis. The outer main end plate 34 and the inner slave end plate 37 are rotatably sleeved on the fixed shaft 10. The first driving member 2 is a cylindrical body and is rotatably sleeved on the fixed shaft 10.

[0085] The fixed shaft 10 is provided with bearings between itself and the inner slave end plate 37, the outer main end plate 34, and the first driving member 2. A bearing is provided between the first driving member 2 and the pyrolysis furnace 5. The second driving member 6 is provided with bearings between itself and the pyrolysis furnace 5, the inner main end plate 36, and the outer slave end plate 35.

[0086] Multiple fins 32 extend radially from the outer main end plate 34, outer slave end plate 35, inner main end plate 36, and inner slave end plate 37. Multiple flexible wires 31 are connected between the free ends of the fins 32 on the outer main end plate 34 and outer slave end plate 35, together forming an outer flexible reaction cage 3a. Multiple flexible wires 31 are connected between the free ends of the fins 32 on the inner main end plate and inner slave end plate 37, together forming an inner flexible reaction cage 3b.

[0087] The outer main end plate 34 and the outer slave end plate 35 have the same radius R, the inner main end plate 36 and the inner slave end plate 37 have the same radius r, and R is greater than r. All the wing rods 32 on the inner flexible reaction cage 3b have the same length, and all the wing rods 32 on the outer flexible reaction cage 3a have the same length.

[0088] Multiple axial support rods 33 are connected between the outer main end plate 34 and the outer slave end plate 35, and between the inner main end plate and the inner slave end plate.

[0089] The outer flexible reaction cage 3a includes multiple flexible scrapers 7. The flexible scrapers 7 can be flat strip-shaped elastic structures. The multiple flexible scrapers 7 can be perpendicular to the circumferential wall of the sealed shell and arranged sequentially around the circumferential direction of rotation.

[0090] The inner scraper assembly includes an inner support 9 and multiple flexible scrapers 7. The inner support 9 is disposed within the annular space formed between the outer flexible reaction cage 3a and the inner flexible reaction cage 3b. The inner support 9 serves as the mounting carrier for the flexible scrapers 7, and its structural design is adapted to the spatial layout of the annular cavity and the installation position of the fixed shaft 10, ensuring stable installation without affecting material transfer. Specifically, the inner support 9 includes a radial extension and an axial extension. To achieve stable fixation of the inner support 9, the radial extension is vertically connected to the outer wall of the fixed shaft 10. The connection method can employ high-temperature resistant and high-strength fixing methods such as welding or bolting, ensuring that the inner support 9 remains fixed with the fixed shaft 10 and does not rotate with the inner flexible reaction cage 3b. The axial extension is perpendicularly connected to the radial extension and extends along the rotation axis. Its extension length is adapted to the axial length of the inner flexible reaction cage 3b. Each flexible scraper 7 is connected to the axial extension and is spaced apart sequentially along the length of the axial extension, ensuring that the flexible scrapers 7 can cover the entire axial area of ​​the inner flexible reaction cage 3b, achieving comprehensive scraping and cleaning. Each flexible scraper 7 is evenly spaced on the axial extension, and the scraping end of each flexible scraper 7 is in close contact with the cage surface of the inner flexible reaction cage 3b. The contact pressure can be adapted according to the elastic characteristics of the flexible scraper 7, ensuring the scraping effect while avoiding excessive scraping force that could damage the flexible filaments 31 of the inner flexible reaction cage 3b. The multiple flexible scrapers 7 are evenly arranged along the axial extension, achieving complete coverage of the circumferential surface of the inner flexible reaction cage 3b, avoiding scraping blind spots, and ensuring that softened materials and pyrolysis residues on the surface of the inner flexible reaction cage 3b can be effectively scraped away. The flexible scraper 7 can adopt an elastic structure to adapt to the slight vibration during the rotation of the inner flexible reaction cage 3b, as well as the volume change of the material after heating, so as to avoid rigid friction between the scraper and the cage, extend the service life of both, and ensure the continuity and stability of the scraping process.

[0091] An inner scraper assembly is arranged between the outer and inner flexible reaction cages 3b. One end of the inner support 9 of the inner scraper assembly is fixed to the outer surface of the fixed shaft 10. The spacing between adjacent flexible scrapers 7 on the axial extension of the inner support 9 is at least 10 mm. The flexible scrapers 7 of the inner scraper assembly are arranged in the middle of the separation zone B, and the central angle on the rotation axis corresponding to the distribution area is in the range of 45~90°. The flexible scrapers 7 of the outer scraper assembly are arranged above the end of the separation zone B, and the central angle on the rotation axis corresponding to the distribution area does not exceed 45°. The flexible scrapers 7 are made of stainless steel. This design allows the flexible scrapers 7 to fully contact the flexible wires 31, facilitating the scraping and removal of adhesive residues remaining on the mesh surface of the flexible reaction cage 3.

[0092] Branches can be provided on the flexible wires 31 of the outer flexible reaction cage 3a and the inner flexible reaction cage 3b, and the length of the branches is greater than the spacing between adjacent flexible wires 31 (to accommodate raw materials with large volume changes during pyrolysis). The branches overlap the adjacent flexible wires 31 in the opposite direction of the movement (to reduce the resistance when the branches move relative to the flexible scraper 7). The material of the flexible wires 31 is high-temperature resistant steel, molybdenum, tungsten or nickel, and the flexible scraper 7 can be a stainless steel sheet.

[0093] In some possible implementations, the feed inlet 1 located above the head end of the reaction zone A of the sealed shell is connected to the feeding system. The longitudinal length y of the feed inlet 1 is less than the distance x between the inner main end plate 36 and the inner slave end plate 37. The lateral width of the feed inlet 1 corresponds to a central angle of the cross-section of the sealed shell that does not exceed 45°. The gas outlet 8 located on the side of the reaction zone A of the sealed shell can be connected to the separation and condensation system. The discharge port 4 located below the head end of the separation zone B of the sealed shell can be connected to the solid collection system.

[0094] On the inner surface of the recessed side of the circumferential wall of the sealed shell or the axial extension (which is an arc-shaped strip), a plurality of flexible scrapers 7 are evenly distributed, and the interval between adjacent flexible scrapers 7 is at least 10 mm. The inner layer flexible scrapers 7 (flexible scrapers 7 on the inner scraper assembly) are arranged in the middle of the separation zone B, and the central angle on the central axis (rotation axis) corresponding to the distribution area is in the range of 45~90°. The outer layer flexible scrapers 7 (outer scraper assembly) are arranged above the end of the separation zone B, and the central angle on the central axis corresponding to the distribution area does not exceed 45°.

[0095] The gas outlet 8, located on the side of reaction zone A within the sealed shell, can be connected to a separation and condensation system. The discharge port 4, located below the beginning of separation zone B within the sealed shell, can be connected to a solid collection system. A heat exchange flue can be arranged on the outside of the sealed shell to burn the solid carbon and non-condensable gases produced by pyrolysis, and then the flue gas is introduced into the heat exchange flue for self-heating of the pyrolysis device. Alternatively, an independent temperature control device (preferably an electromagnetic heating system) can be installed on the outside of the sealed shell to ensure that the raw materials continue to pyrolyze at the optimal temperature required by the pyrolysis curve, resulting in high reaction efficiency and effectively ensuring the time required for complete pyrolysis. The temperature of reaction zone A is not lower than the temperature of separation zone B, ensuring that the lower temperature of separation zone B solidifies the incompletely pyrolyzed raw materials, facilitating peeling from the flexible filament 31.

[0096] The external double-layer flexible rotary pyrolysis device of this application can perform continuous two-stage efficient pyrolysis of large-sized strip-shaped organic waste in a confined space. The core components are the outer and inner flexible reaction cages 3b and the flexible scraper 7. The sealed shell is divided into a reaction zone A and a separation zone B. The outer or inner flexible reaction cage 3b is fixed to a pair of corresponding active and driven end plates by fins 32. The first driving member 2 and the second driving member 6 drive the outer and inner flexible reaction cages 3b to rotate in the same direction, moving from the top to the bottom within the reaction zone A. Flexible wires 31 are connected between the fins 32 on both ends of the outer and inner flexible reaction cages 3b, forming the mesh surfaces of the outer and inner layers, respectively. After the strip-shaped waste enters the sealed shell and falls onto the outer flexible reaction cage 3a, it softens as the temperature rises, wraps around and adheres to the flexible wires 31, and begins to undergo pyrolysis. The outer flexible reaction net carries the material from top to bottom through reaction zone A and into separation zone B. At the top of separation zone B, the flexible scraper 7 intermittently collides with the outer flexible wires 31, generating elastic high-frequency vibration. This vibration and scraping action peels off the incompletely pyrolyzed material while simultaneously crushing the pyrolysis residue coke and slag. The incompletely pyrolyzed material falls onto the inner flexible reaction cage 3b, and under the influence of the inner flexible reaction cage 3b, it passes through reaction zone A a second time from the top of separation zone B and enters separation zone B again until pyrolysis is complete. After entering separation zone B for the second time and reaching the middle, the flexible scraper 7 intermittently collides with the inner flexible wires 31, peeling off the pyrolysis residue coke and slag, and automatically discharging the material through gravity. Due to the adoption of the above technical solution, this invention has the following effects:

[0097] 1. Stable operation of the device: The strip-shaped waste material used as raw material undergoes pyrolysis on the flexible reaction cage. The raw material softens when heated and can spontaneously adhere and fix itself to the flexible wire 31. At the same time, it ensures that the contact area between the raw material and the flexible wire 31 is small, so that the pyrolysis residue can easily detach spontaneously under the intermittent collision action of the flexible scraper 7, effectively preventing the flexible reaction cage from clogging and ensuring that the device can operate continuously. The active end plate of the outer or inner layer can drive the corresponding driven end plate to rotate through the support rod 33, so that the coaxial outer and inner flexible reaction cages 3b can be independently controlled to rotate without interfering with each other, and the operation is stable.

[0098] 2. High heat transfer efficiency and high pyrolysis efficiency: The outer and inner flexible reaction nets are located inside the sealed shell and are close to each other, which reduces heat dissipation and makes the temperature of the outer flexible reaction net higher than that of the inner flexible reaction net. This ensures that the raw materials continue to pyrolyze at the optimal temperature required by the pyrolysis curve with decreasing temperature, resulting in high reaction efficiency. In addition, the flexible scraper 7 can effectively scrape off the coke and pyrolysis residues adhering to the surface of the flexible reaction cage during the pyrolysis process, which is conducive to heat transfer and improves pyrolysis efficiency.

[0099] 3. Effective control of reaction time: The raw materials are mainly bonded to the elastic flexible wires 31. When the outer flexible wires 31 move to the top of the separation zone B or the inner flexible wires 31 move to the middle of the separation zone B, they are subjected to intermittent collisions by the flexible scraper 7 and vibrate violently. This can peel off the raw materials that are not fully pyrolyzed or the coke and waste residues that are left over from pyrolysis that are bonded to the flexible wires 31. At the same time, the inner and outer flexible reaction cages 3a can be independently controlled in terms of speed, which can effectively control the first and second stage pyrolysis time.

[0100] 4. Convenient reaction control and wide adaptability of raw materials: Depending on the characteristics of the raw materials and the type of target product, flexible wires 31 with different gaps and connection methods and flexible scrapers 7 with different sizes and layouts can be replaced. At the same time, the feeding speed, rotation speed of the second drive unit 6 and the first drive unit 2, pyrolysis temperature and other parameters of the device can be flexibly controlled to adjust the pyrolysis reaction process, so as to achieve efficient pyrolysis process of different raw materials in a targeted manner.

[0101] 5. Convenient discharge and automatic slag removal: The incompletely pyrolyzed raw material located on the outer flexible reaction cage 3a can automatically fall into the inner flexible reaction net under the action of the flexible scraper 7 and gravity to continue pyrolysis. At the same time, the lower temperature of the separation zone B can also solidify the incompletely pyrolyzed raw material, making it easy to peel off from the flexible wire 31. The outer flexible scraper 7 is arranged at the top of the separation zone B, which ensures that the incompletely pyrolyzed raw material peeled off from the outer layer can fall onto the inner flexible wire 31 to continue the reaction. Meanwhile, the inner flexible scraper 7 is arranged in the middle of the separation zone B, so that the remaining coke and slag after pyrolysis can fall smoothly without obstruction and be automatically discharged from the discharge port 4 under the action of gravity.

[0102] 6. Simple structure and easy maintenance: No complex rotating components are required. The flexible scraper 7 is an elastic flat strip structure. The wing rod 32 is connected to the two end plates. The outer edge of the wing rod 32 is connected to each other by flexible wires 31. The rotating components are easy to replace and the device is easy to maintain. By simply adjusting the connection method of the flexible wires 31, the gap of the mesh surface of the inner flexible reaction cage 3b is made smaller than the gap of the mesh surface of the outer flexible reaction cage 3a. This ensures that the unpyrolyzed raw material peeled off from the outer flexible reaction cage 3a can fall onto the inner flexible reaction cage 3b, avoiding it from passing directly through the gap. The device structure is simple.

[0103] 7. Compact device with high space utilization: Large strip-shaped raw materials can be directly fed into the pyrolysis device for pyrolysis without being crushed into particles, which can save additional pretreatment, stirring, decoking and other equipment. At the same time, the outer and inner flexible reaction cages 3b of the core device are arranged coaxially in the same pyrolysis furnace 5 in a nested manner, making the device compact and improving the overall space utilization.

[0104] 8. Effective dechlorination and clean emissions: Pyrolysis is an anaerobic process that produces reducing components such as H2 and CO. Moreover, the temperature is relatively low, which can effectively inhibit the formation of harmful substances such as dioxins from the source and achieve efficient dechlorination.

[0105] This application also provides a pyrolysis method for an external double-layer flexible rotary pyrolysis device, including:

[0106] Step S1: The driving mechanism drives the inner flexible reaction cage 3b and the outer flexible reaction cage 3a to rotate in the same direction, while heating the pyrolysis furnace 5 to the set temperature.

[0107] Step S2: The raw material is fed into the outer flexible reaction cage 3a through the feed port 1. As the temperature rises, the material softens and adheres to the outer flexible reaction cage 3a and undergoes pyrolysis.

[0108] In this step, the raw material is fed into the outer flexible reaction cage 3a through the feed port 1 and falls onto the flexible filament 31 at the top of the outer flexible reaction cage 3a. As the temperature rises, the raw material softens and adheres to the flexible filament 31 and undergoes pyrolysis.

[0109] Step S3: The outer flexible reaction cage 3a rotates, driving the material from the reaction zone A into the separation zone B, and the material is peeled off by the outer scraper assembly in the separation zone B. At least part of the peeled material falls onto the inner flexible reaction cage 3b and rotates with the inner flexible reaction cage 3b.

[0110] In this step, the outer flexible reaction cage 3a rotates continuously under the drive of the first driving component 2, causing the raw material at the beginning of the outer layer of reaction zone A to move to the end of the outer layer of reaction zone A and enter the outer layer of separation zone B. The degree of pyrolysis gradually increases, and hot steam is generated. At the end of the outer layer of separation zone B, the first flexible scraper 7 located on the sealed shell of the pyrolysis furnace 5 intermittently collides with the flexible wires 31 of the outer flexible reaction cage 3a, peeling off the raw material that is not completely pyrolyzed and adhering to the outer surface of the flexible reaction cage, while breaking up the coke and waste residue remaining from pyrolysis. The incompletely pyrolyzed raw material peeled off from the outer flexible reaction cage 3a falls down onto the inner flexible reaction cage 3b.

[0111] Step S4: The inner flexible reaction cage 3b rotates, driving the material from reaction zone A into separation zone B, and the material is peeled off in separation zone B by the inner scraper assembly.

[0112] Driven by the second driving component 6, the inner flexible reaction cage 3b rotates continuously, causing the incompletely pyrolyzed raw material located at the end of the inner layer of separation zone B to pass through the entire reaction zone A and enter the beginning of the inner layer of separation zone B, where it continues to generate pyrolysis steam until it is completely pyrolyzed and converted into coke and waste residue. In the middle of the inner layer of separation zone B, the inner flexible scraper 7 intermittently collides with the flexible wires 31 of the inner flexible reaction cage 3b, peeling off the coke and waste residue remaining on the inner flexible reaction cage 3b.

[0113] The coke and waste fragments stripped from the outer and inner layers of separation zone B pass through the flexible reaction cage under gravity and are automatically discharged from the discharge port 4 below, where they are collected by the solids collection system. The generated pyrolysis vapors are discharged through the gas outlet 8, and after condensation and separation, the liquid products and non-condensable gases are collected.

[0114] In order to improve the pyrolysis efficiency of the raw materials, the temperature of the pyrolysis furnace 5 is set to 300~800℃, and the rotation speed of the first drive component 2 and the second drive component 6 is set to 1~20r / min. This makes the temperature and reaction time of the pyrolysis process as close as possible to the optimal pyrolysis environment of the specific strip-shaped raw materials, thereby improving the pyrolysis conversion rate of the raw materials and the yield of the target product.

[0115] The technical solution of the present invention will be further described below based on preferred embodiments. Specifically, the radius of the sealed outer shell of the pyrolysis furnace 5 is 1000 mm and the length is 1400 mm. The length y of the feed inlet 1 is 800 mm and the width is 100 mm. The diameter of the first driving member 2 is 400 mm, and the diameters of the second driving member 6 and the fixed shaft 10 are 150 mm. The length of the outer flexible reaction cage 3a is 1200 mm, the outer diameter R of the outer main end plate 34 and the outer slave end plate 35 is 500 mm and the width is 50 mm, and 60 fins 32 are evenly arranged on the outer edges of the outer main end plate 34 and the outer slave end plate 35. The length of the inner flexible reaction cage 3b is 1000 mm, the outer diameter r of the inner main end plate 36 and the inner slave end plate 37 is 300 mm and the width is 50 mm, that is, the distance x between the inner main end plate 36 and the inner slave end plate 37 is 900 mm (reference). Figure 2 To ensure that x is greater than the length y of the feed inlet 11, when feeding from the top, the raw materials falling onto the outer flexible reaction net are distributed within a central 800mm range, allowing the incompletely pyrolyzed raw materials to fall onto the inner flexible reaction cage 3b after their first detachment and continue pyrolysis. Thirty fins 32 are evenly arranged on the outer edges of the inner main end plate 36 and the inner secondary end plate 37; the fins 32 have a diameter of 10mm and a length of 100mm. The flexible wire 31 is made of stainless steel wire; in this embodiment, it uses... Figure 4 The connection can be made in various ways, but is not limited to this material and connection method. The flexible scraper 7 is a flat, strip-shaped, elastic thin stainless steel sheet, 60mm in length, 10mm in width, and 0.2mm in thickness; in this embodiment, it is used... Figure 2 and Figure 3 The inner scraper assembly can be configured in a manner that is not limited to this method; see reference. Figure 3 On the inner surface of the sealed outer shell at the end of separation zone B, 90 flexible scrapers 7 are evenly arranged, with the distribution area corresponding to a central angle of 30° of the cross-section of the sealed outer shell; Reference Figure 2 and Figure 3 On the inner surface of the inner support 9, 60 flexible scrapers 7 are evenly arranged, distributed in areas 30° to both sides of the horizontal plane of symmetry, corresponding to a central angle of 60°. This ingenious arrangement allows the flexible scrapers 7 to balance efficiency and economy when scraping and removing the adhesive residue remaining on the surfaces of the outer and inner flexible reaction cages 3b, respectively.

[0116] The following examples demonstrate the effectiveness of the external double-layer flexible rotary pyrolysis device of this application:

[0117] Example 1

[0118] Waste paper strips with an average length of 300 mm were fed into a sealed enclosure. The temperature of both reaction zone A and separation zone B was set to 450℃. The rotation speed of the first drive component 2 was 4 r / min, and the rotation speed of the second drive component 6 was 2 r / min. After one round of pyrolysis, the pyrolysis gas was collected and rapidly separated and condensed, with a liquid phase yield of 43.3%. The target product, L-glucanone, accounted for 10.4 wt% of the liquid phase product, achieving efficient disposal and utilization of waste paper strips. Simultaneously, after the outer and inner flexible reaction cages 3b rotated once each, the waste paper strips were completely pyrolyzed, and the resulting residue was basically scraped off, effectively preventing the problems of raw material adhesion, blockage, coking, and slagging.

[0119] Example 2

[0120] Waste denim processing material with an average length of 200mm is fed into a sealed shell. The temperature of reaction zone A is set to 700℃, and the temperature of separation zone B is set to 500℃. The rotation speed of the first drive component 2 and the second drive component 6 is 4r / min. After one round of pyrolysis, the pyrolysis gas is collected and rapidly separated and condensed, with 43.9% of the non-condensable gas collected, achieving efficient disposal and utilization of the waste denim processing material. Simultaneously, after the outer and inner flexible reaction cages 3b rotate once each, the waste denim processing material is completely pyrolyzed, and the resulting residue is basically scraped off, effectively preventing the problems of raw material adhesion, blockage, coking, and slagging.

[0121] Example 3

[0122] PET waste plastic wires with an average length of 200mm were fed into a sealed enclosure. The temperature of reaction zone A was set at 550℃, and the temperature of separation zone B was set at 350℃. The rotation speed of the first drive component 2 was 6 r / min, and the rotation speed of the second drive component 6 was 8 r / min. After one round of pyrolysis, the pyrolysis gas was collected and rapidly separated and condensed, with a liquid phase yield of 35.7%, of which the yield of the target product benzoic acid reached 26.5 wt%, achieving efficient disposal and utilization of the waste plastic wires. Simultaneously, after the outer and inner flexible reaction cages 3b rotated once each, the waste plastic wires were completely pyrolyzed, and the resulting residue was basically scraped off, effectively preventing the problems of raw material adhesion, blockage, coking, and slagging.

[0123] Example 4

[0124] Waste tire strips with an average length of 300 mm were fed into a sealed enclosure. The temperature of reaction zone A was set at 650℃, and the temperature of separation zone B was set at 450℃. The rotation speeds of the first drive component 2 and the second drive component 6 were both 5 r / min. After one round of pyrolysis, the pyrolysis gas was collected and rapidly separated and condensed, with a liquid phase yield of 38.9%, of which the target aromatic product accounted for 16.3 wt%, achieving efficient disposal and utilization of waste tire strips. Simultaneously, after the outer and inner flexible reaction cages 3b rotated once each, the waste tire strips were completely pyrolyzed, and the resulting residue was basically scraped off, effectively preventing the problems of raw material adhesion, blockage, coking, and slagging.

[0125] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some modifications or alterations to the above-described technical content to create equivalent embodiments without departing from the scope of the present invention. Any simple modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the scope of the present invention.

Claims

1. An external double-layer flexible rotary pyrolysis device, characterized in that, include: A pyrolysis furnace having a cavity, with a feed inlet at the top of the pyrolysis furnace communicating with the cavity; An outer flexible reaction cage is located inside the cavity and is rotatably connected to the pyrolysis furnace. An inner flexible reaction cage is located inside the outer flexible reaction cage. The inner flexible reaction cage is rotatably connected to the pyrolysis furnace. The rotation axes of the inner and outer flexible reaction cages are collinear. Both the outer scraper assembly and the inner scraper assembly are disposed within the cavity. The outer scraper assembly is in contact with the outer flexible reaction cage, and the inner scraper assembly is in contact with the inner flexible reaction cage. A driving mechanism is provided, which is in transmission cooperation with the outer flexible reaction cage and the inner flexible reaction cage respectively, to drive the inner flexible reaction cage and the outer flexible reaction cage to rotate in the same direction.

2. The external double-layer flexible rotary pyrolysis device according to claim 1, characterized in that, Both the outer flexible reaction cage and the inner flexible reaction cage include multiple flexible wires, which are arranged circumferentially around the axis of rotation. The gap between the flexible filaments (inner flexible filaments) of the inner flexible reaction cage is smaller than the gap between the flexible filaments (outer flexible filaments) of the outer flexible reaction cage.

3. The external double-layer flexible rotary pyrolysis device according to claim 1, characterized in that, The outer scraper assembly is disposed on the inner wall of the pyrolysis furnace; The outer scraper assembly is located on top of the inner flexible reaction cage; The material stripped from the outer flexible reaction cage by the outer scraper assembly can fall into the inner flexible reaction cage.

4. The external double-layer flexible rotary pyrolysis device according to claim 3, characterized in that, The axis of rotation is located on a vertical center plane, and the vertical center plane is perpendicular to the horizontal plane; The feed inlet and the outer scraper assembly are respectively located on both sides of the vertical center plane, and both the feed inlet and the outer scraper assembly are close to the vertical center plane.

5. The external double-layer flexible rotary pyrolysis device according to claim 3, characterized in that, An annular cavity is provided between the outer flexible reaction cage and the inner flexible reaction cage, and the inner scraper assembly is at least partially located within the annular cavity; The projection of the outer scraper assembly onto the inner flexible reaction cage is offset from that of the inner scraper assembly.

6. The external double-layer flexible rotary pyrolysis device according to claim 1, characterized in that, The cavity contains a reaction zone and a separation zone arranged circumferentially along the axis of rotation. The bottom of the pyrolysis furnace is provided with a discharge port, which is located in the separation zone, and the feed port is located in the reaction zone; Both the outer scraper assembly and the inner scraper group are located in the separation zone; Both the outer and inner flexible reaction cages drive the material to rotate from the reaction zone to the separation zone.

7. The external double-layer flexible rotary pyrolysis device according to claim 1, characterized in that, The driving mechanism includes a first driving component and a second driving component; The first driving member and the second driving member are respectively disposed at both ends of the pyrolysis furnace along the rotation axis; The first driving member is connected to the outer flexible reaction cage to drive the outer flexible reaction cage to rotate; The second driving component is connected to the inner flexible reaction cage to drive the inner flexible reaction cage to rotate.

8. The external double-layer flexible rotary pyrolysis device according to claim 7, characterized in that, The outer flexible reaction cage includes an outer main end plate, an outer slave end plate, and outer flexible wires. Each of the outer flexible wires is arranged sequentially around the outer main end plate in the circumferential direction, and the two ends of the outer flexible wires are respectively connected to the outer main end plate and the outer slave end plate. The inner flexible reaction cage includes an inner main end plate, an inner secondary end plate, and inner flexible wires. Each inner flexible wire is arranged sequentially around the inner main end plate in the circumferential direction, and the two ends of each inner flexible wire are respectively connected to the inner main end plate and the inner secondary end plate. The inner main end plate and the inner secondary end plate are located between the outer main end plate and the outer secondary end plate, and the outer main end plate and the inner main end plate are located on opposite sides of the pyrolysis furnace. The first driving member is rotatably disposed on the pyrolysis furnace and connected to the outer main end plate; The second driving member is rotatably disposed in the pyrolysis furnace and rotatably passes through the outer slave end plate and is connected to the inner master end plate.

9. The external double-layer flexible rotary pyrolysis device according to claim 8, characterized in that, Including fixed shafts; The fixed shaft extends along the axis of rotation; Both the outer main end plate and the inner slave end plate are rotatably sleeved on the fixed shaft; The first driving member is a cylindrical body, and the first driving member is rotatably sleeved on the fixed shaft.

10. The pyrolysis method of the external double-layer flexible rotary pyrolysis device as described in any one of claims 1-9, characterized in that, include: Step S1: The driving mechanism drives the inner flexible reaction cage and the outer flexible reaction cage to rotate in the same direction, while heating the pyrolysis furnace to the set temperature. Step S2: The raw material is fed into the outer flexible reaction cage through the feed port. As the temperature rises, the material softens and adheres to the outer flexible reaction cage and undergoes pyrolysis. Step S3: The outer flexible reaction cage rotates, driving the material from the reaction zone into the separation zone. In the separation zone, the material is peeled off by the outer scraper assembly. At least part of the peeled material falls onto the inner flexible reaction cage and rotates with the inner flexible reaction cage. Step S4: The inner flexible reaction cage rotates, driving the material from the reaction zone into the separation zone, and the material is peeled off in the separation zone by the inner scraper assembly.

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