Built-in flexible rotary pyrolysis device and catalytic pyrolysis method

Abstract

The invention relates to the technical field of pyrolysis, in particular to a built-in flexible rotary type pyrolysis device and a catalytic pyrolysis method.The built-in flexible rotary type pyrolysis device comprises a closed shell, a flexible reaction cage and a feeding mechanism, strip-shaped waste enters the flexible reaction cage, raw materials are heated and softened along with temperature rise, and the strip-shaped waste enters the flexible reaction cage; the raw materials are wound and bonded on the flexible wires of the flexible reaction cage and are pyrolyzed at the same time, the flexible reaction cage is driven by the rotating shaft to continuously rotate, so that the raw materials move to the upper part of the closed shell, and the pyrolysis degree is gradually increased; at the upper part of the closed shell, the flexible scraping plate and the flexible wires are intermittently collided to generate elastic high-frequency vibration, and coke and waste residues which are left after pyrolysis are crushed while raw materials which are not completely pyrolyzed are stripped from the flexible wires under the action of vibration and scraping; and the raw materials which are not completely pyrolyzed fall onto the flexible wires again, the steps are repeated till the raw materials are completely pyrolyzed and become coke and waste residue fragments, and automatic discharging is achieved through the gravity effect.

Description

Technical Field

[0001] The present invention relates to the technical field of pyrolysis, and particularly relates to an internal flexible rotary pyrolysis device and a catalytic pyrolysis method. Background Art

[0002] Organic waste materials such as paper, tires, and fibers need to be processed in strip form in some industrial and agricultural productions, and textiles, rubber products, plastic products, etc. also need to be cut and trimmed to produce strip waste before forming. If these strip wastes are randomly discarded or landfilled, they will not only pollute the environment but also cause a large amount of resource waste.

[0003] Pyrolysis is an efficient means of treating organic strip wastes. Compared with traditional treatment methods, it has the advantages of short treatment cycle, high conversion efficiency, obvious volume reduction effect, high-efficiency solidification of heavy metals, and avoidance of the generation of harmful substances such as dioxins. At the same time, it can also obtain high-value solid, liquid, and gas products. However, existing pyrolysis devices have many deficiencies when treating strip raw materials. For example, organic raw materials are very easy to soften and adhere when heated. At the same time, due to the large size of the long strip, it is inevitable to cause blockage inside the pyrolysis device, leading to serious problems of coking and slagging, hindering heat transfer and making the device unable to operate stably for a long time. If the strip raw materials are crushed through additional pre-crushing pretreatment measures, it will significantly increase the power consumption of the reaction device, greatly increase the treatment cost, and result in a large device.

[0004] Therefore, it is urgent to design a new pyrolysis reaction device that can directly feed strip waste materials into the pyrolysis reaction chamber for efficient pyrolysis without pre-crushing pretreatment, and can timely clean the adhered coke and pyrolysis residues, avoid device blockage, and maintain the stable progress of the pyrolysis process. Summary of the Invention

[0005] (1) Technical Problems to be Solved

[0006] In view of the above-mentioned shortcomings and deficiencies of the prior art, the present invention provides an internal flexible rotary pyrolysis device and a catalytic pyrolysis method to solve the technical problems that existing pyrolysis devices have raw materials that are easy to soften, adhere, and block, serious coking and slagging, and relatively high pretreatment costs when treating strip organic wastes.

[0007] (2) Technical Solutions

[0008] To achieve the above object, an internal flexible rotary pyrolysis device provided by the present invention includes:

[0009] A sealed outer shell, which is a horizontally placed hollow cylindrical structure, and an outlet and a gas outlet are provided on the sealed outer shell; on the inner surface of the top of the sealed outer shell, a plurality of flexible scrapers are arranged at intervals, and the flexible scrapers are flat strip-shaped elastic structures;

[0010] A flexible reaction cage, which is a horizontally placed hollow cylindrical structure and is rotatably arranged inside the sealed housing; the flexible reaction cage includes an annular end plate and a circular end plate that are coaxially and spaced apart, multiple axial support rods connecting the annular end plate and the circular end plate, multiple wing rods radially extending along the outer edges of the annular end plate and the circular end plate respectively, and multiple flexible wires connecting the free ends of the wing rods. All the flexible wires together form a net-like surface; the free end of the flexible scraper can contact the net-like surface;

[0011] A feeding mechanism, which includes a feeding channel and a feeder. The feeding channel is a circular tube and includes a connected feeding section and a discharging section; the feeding section is inclined, the discharging section is coaxially arranged with the flexible reaction cage and extends through the sealed housing into the flexible reaction cage; the feeder is arranged inside the discharging section and can push raw materials into the flexible reaction cage.

[0012] Optionally, the feeder includes a stepped slider, a driving device for driving the stepped slider to move back and forth, and a sealing element arranged between the stepped slider and the feeding channel; the bottom surface of the stepped slider closely adheres to the inner surface of the feeding channel; the annular end plate of the flexible reaction cage is rotatably sleeved on the discharging section of the feeding channel through a bearing.

[0013] Optionally, a rotating shaft coaxial with the flexible reaction cage is connected to the circular end plate of the flexible reaction cage; the rotating shaft is supported on the end surface of the sealed housing through a bearing and the rotating shaft can pass through the sealed housing and be connected to an external driving system, and the external driving system can drive the flexible reaction cage to rotate.

[0014] Optionally, a gate or a connected feeding device is arranged at the top end of the feeding channel.

[0015] Optionally, the outer diameters of the annular end plate and the circular end plate are the same, and the lengths of all the wing rods are all the same or at least some are different.

[0016] Optionally, the flexible wire is a stainless steel fine wire, a silicon aluminum fiber wire or an aramid fiber wire;

[0017] And / or, the flexible scraper is a stainless steel thin sheet.

[0018] Optionally, the gas outlet located above the sealed housing can be connected to a separation and condensation system, and the discharge port located below the sealed housing can be connected to a solid collection system.

[0019] Optionally, a plurality of the flexible scrapers are evenly distributed above the flexible reaction cage, and the central angle of the circular section of the sealed outer shell corresponding to the area where the plurality of flexible scrapers are distributed is 60° to 180°.

[0020] Optionally, on the inner surface of the circumferential wall of the sealed outer shell, the interval between adjacent flexible scrapers is at least 10 mm.

[0021] Furthermore, the present invention also provides a catalytic pyrolysis method, which is implemented based on the above-mentioned built-in flexible rotary pyrolysis device, and includes the following steps:

[0022] S1. Drive the rotating shaft to drive the flexible reaction cage to rotate at a set speed, and at the same time heat the inside of the sealed outer shell to a set temperature;

[0023] S2. The raw materials in the feed channel are reciprocally pushed by the feeder into the flexible reaction cage and fall on the flexible filaments at the bottom of the flexible reaction cage. As the temperature rises, the raw materials soften and adhere to the flexible filaments and undergo pyrolysis;

[0024] S3. The flexible reaction cage continuously rotates driven by the rotating shaft, so that the raw materials located below the sealed outer shell move to above the sealed outer shell with the flexible reaction cage, and the degree of pyrolysis gradually increases;

[0025] S4. Above the sealed outer shell, the flexible scraper intermittently collides with the flexible filaments of the flexible reaction cage, stripping the raw materials that are not completely pyrolyzed and adhered to the inner surface of the flexible reaction cage and simultaneously crushing the residual coke and waste slag of pyrolysis;

[0026] S5. The raw materials that are not completely pyrolyzed and peeled off from the flexible filaments at the top of the flexible reaction cage fall onto the flexible filaments at the bottom of the flexible reaction cage under the action of gravity, and continue to repeat steps S2 to S4 until the raw materials are completely pyrolyzed into coke and waste slag;

[0027] S6. The small particle coke and waste slag remaining after pyrolysis automatically discharge from the discharge port through the gaps of the flexible reaction cage under the action of gravity and are collected by the solid collection system; the pyrolysis gas generated is discharged through the gas outlet, and after condensation and separation, the liquid product and the non-condensable gas are collected.

[0028] (III) Beneficial effects

[0029] The technical solution of the present invention provides a built-in flexible rotary pyrolysis device, which can directly and efficiently pyrolyze large-sized strip-shaped organic waste. The core is a flexible reaction cage and a flexible scraper. The strip-shaped waste enters the flexible reaction cage. As the temperature rises, the raw material softens, winds and adheres to the flexible wires of the flexible reaction cage and starts to pyrolyze simultaneously. Driven by the rotating shaft, the flexible reaction cage continuously rotates to move the raw material above the sealed housing, and the degree of pyrolysis gradually increases. Above the sealed housing, the flexible scraper collides with the flexible wires intermittently, generating elastic high-frequency vibrations. Using the vibration and scraping effects, the raw materials that are not completely pyrolyzed are peeled off from the flexible wires, and at the same time, the coke and waste residues remaining after pyrolysis are broken. The raw materials that are not completely pyrolyzed fall onto the flexible wires again, repeating the above steps until complete pyrolysis occurs, turning into coke and waste residue fragments, and realizing automatic discharging through the action of gravity.

[0030] Due to the adoption of the above technical solution, the present invention has the following effects:

[0031] 1. Stable operation of the device: The strip-shaped waste as the raw material undergoes pyrolysis reaction on the flexible reaction cage. The raw material softens when heated and can spontaneously adhere and fix on the flexible wires. At the same time, it ensures that the contact area between the raw material and the flexible wires is small, making it easy for the pyrolysis residues to spontaneously detach under the intermittent collision of the flexible scraper, effectively preventing the flexible reaction cage from being blocked and ensuring the continuous operation of the device.

[0032] 2. High heat transfer efficiency: The flexible scraper can effectively scrape off the coke and pyrolysis residues adhered to the surface of the flexible reaction cage during the pyrolysis process, which is beneficial to heat transfer and improves the pyrolysis efficiency.

[0033] 3. Effective control of the reaction time: The raw material mainly adheres to the elastic flexible wires. Each time the flexible wires move to the top of the sealed housing and are subjected to intermittent collisions by the flexible scraper and generate violent vibrations, the raw materials that are not completely pyrolyzed are peeled off, and at the same time, the coke and waste residues remaining after pyrolysis are broken. The broken small solid residues can pass through the gaps of the flexible reaction cage, while the large-volume raw materials that are not completely pyrolyzed remain in the flexible reaction cage to continue pyrolysis until complete pyrolysis and crushing and then discharged, effectively ensuring the pyrolysis time.

[0034] 4. Convenient reaction regulation and wide adaptability of raw materials: According to the characteristics of the raw materials and the types of target products, flexible wires with different gaps and connection methods, as well as flexible scrapers with different sizes and layouts, can be replaced. At the same time, parameters such as the feeding speed, rotating shaft speed, and pyrolysis temperature of the device can be flexibly controlled to adjust the pyrolysis reaction process, and the high-efficiency pyrolysis process of different raw materials can be realized specifically.

[0035] 5. Automatic slag discharge: The coke and waste residues remaining after pyrolysis will be automatically discharged from the discharge port under the action of the flexible scraper and gravity.

[0036] 6. Simple structure and easy to maintain: Without complex rotating components, the flexible scraper is an elastic flat strip structure. The wing rods are connected to the two end plates, and the outer edges of the wing rods are connected to each other by flexible wires. The rotating components are convenient to replace and the device is easy to maintain. At the same time, the stepped slider is used to push back and forth for feeding, avoiding the winding and blocking problems that may occur when feeding strip-shaped raw materials.

[0037] 7. High space utilization rate: Large-sized strip-shaped raw materials can be directly fed into the pyrolysis device for pyrolysis without being crushed into particles, eliminating the need for additional pretreatment, stirring, coke removal and other equipment, and improving the overall space utilization rate of the device.

[0038] 8. Effective dechlorination and clean emission: Pyrolysis is an anaerobic process, which can produce reducing components such as H2 and CO, and the temperature is relatively low, effectively inhibiting the generation of harmful substances such as dioxins from the source and achieving efficient dechlorination. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Figure 1 It is a schematic cross-sectional structure diagram of the built-in flexible rotary pyrolysis device of the present invention;

[0040] Figure 2 It is a schematic structure diagram of the flexible reaction cage in the present invention;

[0041] Figure 3 It is a schematic circular cross-sectional view of the sealed outer shell and the flexible reaction cage in the present invention;

[0042] Figure 4 It is a schematic cross-sectional view of the discharging section of the feeding mechanism in the present invention.

[0043]

Description of the Reference Numerals

[0044] 1: Feeding channel; 2: Feeder; 3: Flexible reaction cage; 4: Discharge port; 5: Sealed outer shell; 6: Rotating shaft; 7: Flexible scraper; 8: Gas outlet;

[0045] 31: Annular end plate; 32: Wing rod; 33: Support rod; 34: Circular end plate; 35: Flexible wire. DETAILED DESCRIPTION OF THE INVENTION

[0046] In order to better explain the present invention for easy understanding, the present invention will be described in detail below with reference to the drawings through specific embodiments.

[0047] It should be noted that all the directional indications (such as up, down, left, right, front, back...) in the embodiments of the present invention are only used to explain the relative positional relationship and movement conditions between components in a specific posture (as shown in the drawings). If the specific posture changes, the directional indications will also change accordingly.

[0048] In addition, in the present invention, descriptions such as "first", "second", etc. are for descriptive purposes only, and should not be construed as indicating or implying their relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first", "second" may explicitly or implicitly include at least one of such features. In the description of the present invention, "a plurality" means at least two, such as two, three, etc., unless otherwise specifically defined.

[0049] In the present invention, unless otherwise clearly specified and defined, terms such as "connection", "fixation", etc. should be understood in a broad sense. For example, "fixation" can be a fixed connection, a detachable connection, or integrated; "connection" can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and can be the internal communication of two components or the interaction relationship between two components, unless otherwise clearly defined. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0050] See Figures 1 to 3 , the present invention provides a built-in flexible rotary pyrolysis device, which includes a sealed outer shell 5, a flexible reaction cage 3, and a feeding mechanism. Among them, the sealed outer shell 5 is a horizontally placed hollow cylindrical structure, and a discharge port 4 and a gas outlet 8 are provided on the sealed outer shell 5; the gas outlet 8 located above the sealed outer shell 5 can be connected to a separation and condensation system, and the discharge port 4 located below the sealed outer shell 5 can be connected to a solid collection system. A heat exchange flue can be arranged on the outer side of the sealed outer shell 5 to burn the solid carbon and non-condensable gas generated by pyrolysis, and then the flue gas is introduced into the heat exchange flue, which can be used for the self-heating of the pyrolysis device. Alternatively, an independent temperature control device (wherein, the independent temperature control device is preferably an electromagnetic heating system) can also be provided on the outer side of the sealed outer shell 5 to ensure that the raw material continuously pyrolyzes at the optimal temperature required by the pyrolysis curve, with high reaction efficiency and effectively ensuring the time required for complete pyrolysis. A plurality of flexible scrapers 7 are evenly spaced on the inner surface of the top of the sealed outer shell 5, and the flexible scrapers 7 are flat strip-shaped elastic structures.

[0051] The flexible reaction cage 3 is a horizontally placed hollow cylindrical structure and is rotatably arranged in the sealed outer shell 5; the flexible reaction cage 3 includes an annular end plate 31 and a circular end plate 34 that are coaxially and spaced apart (the annular end plate 31 and the circular end plate 34 are respectively located in the middle of the opposite end faces of the corresponding flexible reaction cage 3), a plurality of axial support rods 33 connecting the annular end plate 31 and the circular end plate 34, a plurality of wing rods 32 respectively arranged on the outer edges of the annular end plate 31 and the circular end plate 34 and extending radially, and a plurality of flexible wires 35 connecting the free ends of the wing rods 32. All the flexible wires 35 together form a mesh surface; the free end of the flexible scraper 7 can contact the mesh surface, that is, the length of the flexible scraper 7 is greater than the gap width between the free end of the wing rod 32 and the inner surface of the sealed outer shell 5.

[0052] The feeding mechanism includes a feeding channel 1 and a feeder 2. The feeding channel 1 is a circular tube and includes a connected feeding section and a discharging section; the feeding section is inclined, and the discharging section is horizontally coaxial with the flexible reaction cage 3 and extends into the flexible reaction cage 3 through the sealed housing 5; the feeder 2 is arranged in the discharging section and can push raw materials into the flexible reaction cage 3. Wherein, a gate is provided at the top end of the feeding channel 1, or the top end of the feeding channel 1 is connected to a feeding device.

[0053] The above solution can directly and efficiently pyrolyze large-sized strip-shaped organic waste. The core is the flexible reaction cage 3 and the flexible scraper 7. The strip-shaped waste enters the flexible reaction cage 3 through the feeding channel 1. As the temperature rises, the raw materials are heated and softened, wound and adhered to the flexible wires 35 of the flexible reaction cage 3, and pyrolysis begins at the same time. The continuous rotation of the flexible reaction cage 3 moves the raw materials above the sealed housing 5, and the degree of pyrolysis gradually increases; above the sealed housing 5, the flexible scraper 7 collides with the flexible wires 35 intermittently, generating elastic high-frequency vibrations. Using the vibration and scraping action, the raw materials that are not completely pyrolyzed are peeled off from the flexible wires 35, and at the same time, the coke and waste residues remaining after pyrolysis are broken; the raw materials that are not completely pyrolyzed fall onto the flexible wires 35 again, repeating the above steps until complete pyrolysis, turning into coke and waste residue fragments, and realizing automatic discharging through the action of gravity. The flexible scraper 7 can effectively scrape off the coke and pyrolysis residues adhered to the surface of the flexible reaction cage 3 during the pyrolysis process, which is beneficial to heat transfer and improves the pyrolysis efficiency. Large-sized strip-shaped raw materials can be directly fed into the pyrolysis device for pyrolysis without being broken into particles, eliminating the need for additional pretreatment, stirring, coke removal and other equipment, and improving the overall space utilization rate of the device.

[0054] Among them, in a preferred embodiment, the feeder 2 includes a stepped slider, a driving device (such as a cylinder or an electric push rod) for driving the stepped slider to move back and forth, and a sealing element (such as a metal seal or a ceramic seal) arranged between the stepped slider and the feeding channel 1; the bottom surface of the stepped slider closely adheres to the inner surface of the feeding channel 1 (see Figure 4 ). Using a stepped slider to push back and forth for feeding avoids the possible winding and blocking problems of strip-shaped raw materials during feeding. The annular end plate 31 of the flexible reaction cage 3 is rotatably sleeved on the discharging section of the feeding channel 1 through a bearing. Moreover, a rotating shaft 6 coaxial with the flexible reaction cage 3 is connected to the circular end plate 34 of the flexible reaction cage 3; the rotating shaft 6 is supported on the end surface of the sealed housing 5 through a bearing, and the rotating shaft 6 can pass through the sealed housing 5 and be connected to an external driving system (such as a servo motor), and the external driving system can drive the entire flexible reaction cage 3 to rotate.

[0055] As Figure 1 and Figure 2As shown, the outer diameters of the annular end plate 31 and the circular end plate 34 are the same, and the two are connected and fixed by a plurality of support rods 33 that are evenly distributed and parallel to the axis of the flexible reaction cage 3. The lengths of all the fin rods 32 are all the same or at least partially different. The flexible wire 35 is a stainless steel fine wire, a silicon-aluminum fiber wire, an aramid fiber wire, etc.; the flexible scraper 7 can be a stainless steel thin sheet.

[0056] Combined Figure 1 with Figure 3 it can be known that a plurality of flexible scrapers 7 are evenly distributed above the flexible reaction cage 3, that is, a plurality of flexible scrapers 7 are arranged in an array along the axis and circumferential direction of the flexible reaction cage 3 on the inner surface of the top of the sealed housing 5. The central angle corresponding to the circular cross-section of the sealed housing 5 in the area where the plurality of flexible scrapers 7 are distributed is 60° to 180°, and the area where the plurality of flexible scrapers 7 are distributed is Figure 3 shown as 60° in Figure 3 , that is, at one-third of the middle of the upper half of the circular cross-section of the sealed housing 5; when the area where the plurality of flexible scrapers 7 are distributed covers the upper half circumferential wall of the sealed housing 5, the corresponding central angle is 180°. On the inner surface of the circumferential wall of the sealed housing 5, the interval between adjacent flexible scrapers 7 is at least 10 mm.

[0057] The technical solution of the present invention will be further described below based on the optimal embodiment. Specifically, the inner diameter of the sealed housing 5 is 1000 mm and the length is 1200 mm; the inner diameter of the feed channel 1 is 300 mm, and the stepped slider adopts Figure 1 and Figure 4 three-stage structure, and the stepped heights are 100 mm, 60 mm, and 50 mm from bottom to top respectively; the length of the flexible reaction cage 3 is 1000 mm, the outer diameters of the annular end plate 31 and the circular end plate 34 are 500 mm, and 50 fin rods 32 are evenly arranged on the annular end plate 31 and the circular end plate 34. The rod diameter of the fin rod 32 is 10 mm and the length is 200 mm, ensuring that the distance between the free end of the fin rod 32 and the inner wall of the sealed housing 5 is 50 mm. The flexible wire 35 is a stainless steel fine wire, and in this embodiment, Figure 2 connection method is adopted, but it is not limited to this material and connection method. The flexible scraper 7 is a flat strip-shaped elastic stainless steel thin sheet, with a length of 60 mm, a width of 10 mm, and a thickness of 0.2 mm; 120 flexible scrapers 7 are evenly arranged on the upper surface of the top of the sealed housing 5, with a maximum of 20 distributed along the axis and a maximum of 6 distributed along the circumferential direction. The distribution area is 30° on each side of the vertical symmetry axis of the circular cross-section of the sealed housing 5, that is, corresponding to a central angle of 60°. Such a clever setting can make the flexible scraper 7 achieve the optimal efficiency when scraping and removing the adhesives remaining on the surface of the flexible reaction cage 3.

[0058] To better implement the above technical solution, the present invention also provides a catalytic pyrolysis method for strip-shaped organic waste, which uses the above-mentioned built-in flexible rotary pyrolysis device to pyrolyze strip-shaped organic waste. The steps include:

[0059] S1. Drive the rotating shaft 6 to drive the flexible reaction cage 3 to rotate at a set speed, and at the same time heat the inside of the closed outer shell 5 to a set temperature (450°C to 700°C);

[0060] S2. The strip-shaped waste raw materials in the feed channel 1 are reciprocally pushed into the inside of the flexible reaction cage 3 by the feeder 2, and fall on the flexible wires 35 at the bottom of the flexible reaction cage 3. As the temperature rises, the raw materials soften and adhere to the flexible wires 35 and undergo pyrolysis;

[0061] S3. The flexible reaction cage 3 continues to rotate driven by the rotating shaft, so that the raw materials located below the closed outer shell 5 move to above the closed outer shell 5 with the flexible reaction cage 3, and the degree of pyrolysis gradually increases;

[0062] S4. Above the closed outer shell 5, the flexible scraper 7 collides with the flexible wires 35 of the flexible reaction cage 3 intermittently, generating elastic high-frequency vibrations. Through the intermittent vibration of the flexible wires 35 and the scraping action of the flexible scraper 7, the raw materials that are not completely pyrolyzed and adhered to the inner surface of the flexible reaction cage 3 are peeled off, and at the same time the coke and waste residues remaining after pyrolysis are broken;

[0063] S5. The raw materials that are not completely pyrolyzed and peeled off from the flexible wires 35 at the top of the flexible reaction cage 3 fall onto the flexible wires 35 at the bottom of the flexible reaction cage 3 under the action of gravity, and continue to repeat steps S2 to S4 until the raw materials are completely pyrolyzed into coke and waste residues;

[0064] S6. The small particle coke and waste residues remaining after pyrolysis automatically discharge from the discharge port 4 through the gaps of the flexible reaction cage 3 under the action of gravity and are collected by the solid collection system; the pyrolysis gas generated is discharged through the gas outlet 8, and after condensation and separation, the liquid product and non-condensable gas are collected. Among them, the methods of condensation and separation are prior arts and will not be elaborated here.

[0065] Among them, in order to improve the pyrolysis efficiency of the raw materials, the set temperature of the pyrolysis furnace is 300 - 800°C, and the rotation speed of the rotating shaft is set to 1 - 20 r / min, so that the conditions such as the temperature and reaction time in the pyrolysis process as much as possible meet the best pyrolysis environment of specific strip-shaped raw materials, thereby improving the pyrolysis conversion rate of the raw materials and the yield of target products. The following details the process flow of catalytic pyrolysis using the flexible rotary pyrolysis device through specific examples. The devices used in each example have basically the same structure.

[0066] Example 1

[0067] Send waste paper strips with an average length of 300 mm into the sealed housing 5. The temperature of the sealed housing 5 is set at 450 °C, and the rotation speed of the rotating shaft 6 is 4 r / min. After one round of pyrolysis, collect the pyrolysis gas and carry out rapid separation and condensation. The liquid-phase yield is 43.2%, and the target product levoglucosenone accounts for 10.7 wt% in the liquid-phase product, realizing the efficient disposal and utilization of waste paper strips. At the same time, after the flexible reaction cage 3 rotates one circle, the residue generated by the pyrolysis of waste paper strips has basically been scraped clean, effectively preventing the problems of raw material adhesion blockage and coking and slagging.

[0068] Example 2

[0069] Send waste processing scraps of old jeans with an average length of 200 mm into the sealed housing 5. The temperature of the sealed housing 5 is set at 700 °C, and the rotation speed of the rotating shaft 6 is 2 r / min. After one round of pyrolysis, collect the pyrolysis gas and carry out rapid separation and condensation. Collect 43.3% of the non-condensable gas, realizing the efficient disposal and utilization of waste processing scraps of old jeans. At the same time, after the flexible reaction cage 3 rotates one circle, the residue generated by the pyrolysis of waste processing scraps of old jeans has basically been scraped clean, effectively preventing the problems of raw material adhesion blockage and coking and slagging.

[0070] Example 3

[0071] Send PET waste plastic wires with an average length of 200 mm into the sealed housing 5. The temperature of the sealed housing 5 is set at 500 °C, and the rotation speed of the rotating shaft 6 is 10 r / min. After one round of pyrolysis, collect the pyrolysis gas and carry out rapid separation and condensation. The liquid-phase yield is 36.3%, and the yield of the target product benzoic acid reaches 27.4 wt%, realizing the efficient disposal and utilization of waste plastic wires. At the same time, after the flexible reaction cage 3 rotates one circle, the residue generated by the pyrolysis of waste plastic wires has basically been scraped clean, effectively preventing the problems of raw material adhesion blockage and coking and slagging.

[0072] Example 4

[0073] Send waste tire strips with an average length of 300 mm into the sealed housing 5. The temperature of the sealed housing 5 is set at 600 °C, and the rotation speed of the rotating shaft 6 is 8 r / min. After one round of pyrolysis, collect the pyrolysis gas and carry out rapid separation and condensation. The liquid-phase yield is 39.3%, and the target aromatic hydrocarbon product accounts for 16.7 wt% in the liquid-phase product, realizing the efficient disposal and utilization of waste tire strips. At the same time, after the flexible reaction cage 3 rotates one circle, the residue generated by the pyrolysis of waste tire strips has basically been scraped clean, effectively preventing the problems of raw material adhesion blockage and coking and slagging.

[0074] It should be understood that the above description of the specific embodiments of the present invention is only for explaining the technical route and features of the present invention, and its purpose is to enable those skilled in the art to understand the content of the present invention and implement it accordingly. However, the present invention is not limited to the above specific embodiments. Any changes or modifications made within the scope of the claims of the present invention should be covered by the protection scope of the present invention.

Claims

1. An internally-mounted flexible rotary pyrolysis device, characterized in that, The built-in flexible rotary pyrolysis device includes: A sealed housing (5), which is a horizontally placed hollow cylindrical structure. An outlet (4) and a gas outlet (8) are provided on the sealed housing (5); on the inner surface of the top of the sealed housing (5), a plurality of flexible scrapers (7) are arranged at intervals. The flexible scraper (7) is an elastic structure in the shape of a flat strip; A flexible reaction cage (3), which is a horizontally placed hollow cylindrical structure and is rotatably arranged in the sealed housing (5); the flexible reaction cage (3) includes an annular end plate (31) and a circular end plate (34) that are coaxial and arranged at intervals, a plurality of axial support rods (33) connecting the annular end plate (31) and the circular end plate (34), a plurality of wing rods (32) radially extending along the outer edges of the annular end plate (31) and the circular end plate (34) respectively, and a plurality of flexible wires (35) connecting the free ends of the wing rods (32). All the flexible wires (35) together form a net-like surface; the free end of the flexible scraper (7) can contact the net-like surface; A feeding mechanism, which includes a feeding channel (1) and a feeder (2). The feeding channel (1) is a circular tube and includes a connected feeding section and a discharging section; the feeding section is inclined, and the discharging section is coaxially arranged with the flexible reaction cage (3) and passes through the sealed housing (5) and extends into the flexible reaction cage (3); the feeder (2) is arranged in the discharging section and can push raw materials into the flexible reaction cage (3).

2. The built-in flexible rotary pyrolysis device according to claim 1, wherein The feeder (2) includes a stepped slider, a driving device for driving the stepped slider to move back and forth, and a sealing element arranged between the stepped slider and the feeding channel (1); the bottom surface of the stepped slider closely adheres to the inner surface of the feeding channel (1); The annular end plate (31) of the flexible reaction cage (3) is rotatably sleeved on the discharging section of the feeding channel (1) through a bearing.

3. The built-in flexible rotary pyrolysis device according to claim 1, characterized in that, A rotating shaft (6) coaxial with the flexible reaction cage (3) is connected to the circular end plate (34) of the flexible reaction cage (3); the rotating shaft (6) is supported on the end surface of the sealed housing (5) through a bearing and the rotating shaft (6) can pass through the sealed housing (5) and be connected to an external driving system, and the external driving system can drive the flexible reaction cage (3) to rotate.

4. The built-in flexible rotary pyrolysis device according to claim 1, wherein A gate or a connected feeding device is provided at the top of the feeding channel (1).

5. The built-in flexible rotary pyrolysis device according to claim 1, wherein The outer diameters of the annular end plate (31) and the circular end plate (34) are the same, and the lengths of all the wing rods (32) are all the same or at least partially different.

6. The built-in flexible rotary pyrolysis device according to claim 1, characterized in that The flexible wire (35) is a stainless steel fine wire, a silicon aluminum fiber wire or an aramid fiber wire; And / or, the flexible scraper (7) is a stainless steel thin sheet.

7. The built-in flexible rotary pyrolysis device according to any one of claims 1-6, characterized in that, The gas outlet (8) located above the sealed housing (5) can be connected to a separation and condensation system, and the outlet (4) located below the sealed housing (5) can be connected to a solid collection system.

8. The built-in flexible rotary pyrolysis device according to any one of claims 1-6, characterized in that, A plurality of the flexible scrapers (7) are evenly distributed above the flexible reaction cage (3), and the central angle corresponding to the circular cross-section of the sealed housing (5) in the area where the plurality of the flexible scrapers (7) are distributed is 60° to 180°.

9. The built-in flexible rotary pyrolysis device according to any one of claims 1-6, characterized in that, On the inner surface of the circumferential wall of the sealed housing (5), the interval between adjacent flexible scrapers (7) is at least 10 mm.

10. A catalytic pyrolysis method, the catalytic pyrolysis method is implemented based on the built-in flexible rotary pyrolysis device according to any one of claims 1-9, characterized in that, The catalytic pyrolysis method comprises the following steps: S1. Driving the rotating shaft (6) to drive the flexible reaction cage (3) to rotate at a set speed, and simultaneously heating the inside of the sealed housing (5) to a set temperature; S2. The raw materials in the feed channel (1) are reciprocally pushed by the feeder (2) and fed into the flexible reaction cage (3), and fall on the flexible filaments (35) at the bottom of the flexible reaction cage (3). As the temperature rises, the raw materials soften and adhere to the flexible filaments (35) and pyrolyze; S3. The flexible reaction cage (3) continuously rotates driven by the rotating shaft, so that the raw materials located below the sealed housing (5) move to above the sealed housing (5) along with the flexible reaction cage (3), and the degree of pyrolysis gradually increases; S4. Above the sealed housing (5), the flexible scraper (7) collides with the flexible filaments (35) of the flexible reaction cage (3) intermittently, stripping the raw materials that are not completely pyrolyzed and adhered to the inner surface of the flexible reaction cage (3) and simultaneously crushing the residual coke and waste slag of pyrolysis; S5. The raw materials that are not completely pyrolyzed and peeled off from the flexible filaments (35) at the top of the flexible reaction cage (3) fall onto the flexible filaments (35) at the bottom of the flexible reaction cage (3) under the action of gravity, and steps S2 to S4 are continuously repeated until the raw materials are completely pyrolyzed into coke and waste slag; S6. The small particle coke and waste slag remaining after pyrolysis automatically discharge from the discharge port (4) through the gaps of the flexible reaction cage (3) under the action of gravity and are collected by the solid collection system; the pyrolysis gas generated is discharged through the gas outlet (8), and after condensation and separation, the liquid product and the non-condensable gas are collected.

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