External flexible rotary pyrolysis device and catalytic pyrolysis method

Abstract

The invention relates to the technical field of pyrolysis, in particular to an external flexible rotary pyrolysis device and a catalytic pyrolysis method.The external flexible rotary pyrolysis device comprises a pyrolysis furnace, a rotating shaft, a driver, a flexible reaction cage and a plurality of flexible scrapers; the flexible reaction cage comprises a plurality of supporting surfaces arranged on the rotating shaft at intervals along the axial direction and a flexible reaction net supported by the plurality of supporting surfaces; all the flexible scrapers are of flat strip-shaped elastic structures, one ends of the flexible scrapers are fixed on the inner surface of the circumferential wall of the pyrolyzing furnace, and the other ends of the flexible scrapers can be in contact with the flexible reaction net. According to the invention, large-size strip-shaped organic wastes can be directly and efficiently pyrolyzed, so that the technical problems that raw materials are easy to soften, bond and block, coking and slagging are serious and the pretreatment cost is relatively high when the strip-shaped organic wastes are treated by the existing pyrolysis device are solved.

Description

Technical Field

[0001] The present invention relates to the technical field of pyrolysis, and particularly relates to an external 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 discarded or landfilled randomly, they will not only pollute the environment but also cause a large amount of resource waste.

[0003] Pyrolysis is an efficient means for treating organic strip wastes. Compared with traditional treatment methods, it has the advantages of short treatment cycle, high conversion efficiency, obvious volume reduction effect, efficient 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-treatment 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, there is an urgent need to design a new pyrolysis reaction device that can directly feed strip waste raw materials into the pyrolysis reaction chamber for efficient pyrolysis without pre-crushing treatment, and can timely clean the adhered coke and pyrolysis residues to 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 disadvantages and deficiencies of the prior art, the present invention provides an external flexible rotary pyrolysis device and a catalytic pyrolysis method to solve the technical problems that existing pyrolysis devices have problems such as easy softening, adhesion, and blockage of raw materials, serious coking and slagging, and high pre-treatment costs when treating strip organic wastes.

[0007] (2) Technical Solutions

[0008] To achieve the above object, an external flexible rotary pyrolysis device provided by the present invention includes: a pyrolysis furnace, a rotating shaft, a driver, a flexible reaction cage, and a plurality of flexible scrapers;

[0009] The pyrolysis furnace is a horizontally placed hollow cylindrical structure, and the pyrolysis furnace is provided with a feed inlet, a discharge outlet and a gas outlet; the rotating shaft is coaxially arranged on the opposite end faces of the pyrolysis furnace, and the driver can drive the rotating shaft to rotate;

[0010] The flexible reaction cage includes a plurality of support surfaces arranged at intervals along the axial direction on the rotating shaft and a flexible reaction net supported by the plurality of support surfaces;

[0011] All the flexible scrapers are flat strip-shaped elastic structures, one end of the flexible scraper is fixed on the inner surface of the circumferential wall of the pyrolysis furnace and the other end can contact the flexible reaction net.

[0012] Optionally, the support surfaces are all perpendicular to the rotating shaft, and each support surface includes a plurality of wing rods located in the same plane and extending radially outward from the rotating shaft. The free ends of the wing rods of adjacent support surfaces are connected to each other by a plurality of flexible wires, and the plurality of flexible wires together form the flexible reaction net.

[0013] Optionally, the feed inlet is a rectangular opening located at the top of the pyrolysis furnace, the length direction of the feed inlet extends along the axial direction of the pyrolysis furnace, and a gate is arranged on the feed inlet or the feed inlet is communicated with a feeding device;

[0014] The discharge outlet is a rectangular opening located at the bottom of the pyrolysis furnace, the discharge outlet is directly below the feed inlet, the length of the discharge outlet is greater than the length of the feed inlet, and the discharge outlet is connected to a solid collection system;

[0015] The gas outlet is located at the top of one end of the pyrolysis furnace, and the gas outlet is connected to a separation and condensation system.

[0016] Optionally, a plurality of the flexible scrapers are evenly distributed below the flexible reaction cage and on opposite sides of the discharge outlet; on the inner surface of the circumferential wall of the pyrolysis furnace, the interval between adjacent flexible scrapers is at least 10 mm.

[0017] Optionally, a plurality of the flexible scrapers are divided into multiple groups, and a group of the flexible scrapers is arranged below the area between adjacent two support surfaces.

[0018] Optionally, the axial interval between adjacent two support surfaces is equal, and the axial interval is 100 - 300 mm.

[0019] Optionally, the gap between the free end of the wing rod and the inner surface of the circumferential wall of the pyrolysis furnace is 20 - 50 mm, and the length of the flexible scraper is 5 - 10 mm larger than the gap.

[0020] Optionally, all the wing rods have the same length or at least some of them have different lengths.

[0021] Optionally, the flexible wire is a stainless steel fine wire, an aluminosilicate fiber wire or an aramid fiber wire;

[0022] And / or, the flexible scraper is a stainless steel thin sheet.

[0023] Furthermore, the present invention also provides a catalytic pyrolysis method, which is implemented based on the above-mentioned external flexible rotary pyrolysis device and includes the following steps:

[0024] S1. Drive the driver to drive the rotating shaft and the flexible reaction cage to rotate at a set speed, and at the same time heat the pyrolysis furnace to a set temperature;

[0025] S2. The raw material enters the pyrolysis furnace from the feed port and lands on the flexible reaction cage. As the temperature rises, the raw material softens and adheres to the flexible wire and undergoes pyrolysis;

[0026] S3. The flexible reaction cage continues to rotate driven by the rotating shaft, so that the raw material located above the pyrolysis furnace moves to the bottom of the pyrolysis furnace along with the flexible reaction cage;

[0027] S4. At the bottom of the pyrolysis furnace, the flexible scraper collides with the flexible reaction cage intermittently, removing the coke and waste residue remaining on the surface of the flexible reaction cage, and automatically discharging through the flexible reaction cage under the action of gravity from the discharge port;

[0028] S5. The generated pyrolysis gas is discharged through the gas outlet, and then through condensation and separation, a liquid product and a non-condensable gas are obtained.

[0029] (III) Beneficial effects

[0030] The technical solution of the present invention provides an external 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 is heated and softened, wound and adhered to the flexible wire of the flexible reaction cage and starts to undergo pyrolysis at the same time. The flexible reaction cage continues to rotate driven by the rotating shaft, and the raw material is completely pyrolyzed when it moves to the lower part of the pyrolysis furnace; at the lower part of the pyrolysis furnace, the flexible scraper collides with the flexible wire intermittently, generating elastic high-frequency vibration, using the vibration and scraping action to remove the coke and waste residue remaining on the surface of the flexible reaction cage, and realizing automatic discharging through the action of gravity. 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 wire. At the same time, it ensures a small contact area between the raw material and the flexible wire, making the pyrolysis residue easily fall off spontaneously under the intermittent collision of the flexible scraper, preventing the raw material from directly falling out of the discharge port or sticking to the inner surface of the pyrolysis furnace, effectively preventing the blockage of the pyrolysis furnace and ensuring the smooth and 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 reaction time: Since the raw material mainly contacts the elastic flexible wire, the violent vibration caused by the flexible wire moving to the lower side of the pyrolysis furnace hitting the flexible scraper is difficult to be transmitted to the flexible wire above the pyrolysis furnace, avoiding the accidental falling off of the unreacted raw material and ensuring an effective reaction time.

[0034] 4. Convenient reaction regulation and wide raw material adaptability: According to the characteristics of the raw material and the types of target products, the flexible reaction cage with different gaps and connection methods and the flexible scraper with different sizes and layouts can be replaced. At the same time, the parameters such as the feeding speed, rotation speed of the rotating shaft, 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 achieved targeted.

[0035] 5. Automatic slag discharge: The remaining coke and waste residue 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 maintenance: There is no need for complex rotating components. The flexible scraper is an elastic flat strip structure. The wing rods are connected to the rotating shaft, and the outer edges of the wing rods are connected to each other by flexible wires, which is convenient for replacement and easy for device maintenance.

[0037] 7. High space utilization rate: Large-size strip-shaped raw materials can be directly fed into the pyrolysis device for pyrolysis without being crushed into particles, which can save additional equipment such as pretreatment, stirring, and coke removal, and improve 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, which can effectively inhibit the generation of harmful substances such as dioxins from the source and achieve efficient dechlorination. Brief Description of the Drawings

[0039] Figure 1 It is a schematic structural diagram of the external flexible rotary pyrolysis device of the present invention;

[0040] Figure 2 is Figure 1 the left-view sectional structural diagram;

[0041] Figure 3 Schematic diagram of the parallel flexible wire connection method;

[0042] Figure 4 Schematic diagram of the folded flexible wire connection method;

[0043] Figure 5 Schematic diagram of the cross - type flexible wire connection method.

[0044]

Description of the attached drawing reference numerals

[0045] 1: Pyrolysis furnace; 11: Feed inlet; 12: Discharge outlet; 13: Gas outlet;

[0046] 2: Rotating shaft;

[0047] 3: Driver;

[0048] 4: Flexible reaction cage; 41: Support surface; 411: Wing rod; 42: Flexible reaction net; 421: Flexible wire;

[0049] 5: Flexible scraper. Detailed implementation manners

[0050] For better explaining the present invention for easy understanding, the present invention will be described in detail below in conjunction with the attached drawings through specific implementation manners.

[0051] It should be noted that all 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 attached drawings). If this specific posture changes, the directional indications will also change accordingly.

[0052] In addition, the descriptions such as "first" and "second" in the present invention are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first" and "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 clearly and specifically defined.

[0053] In the present invention, unless otherwise clearly specified and defined, terms such as "connection" and "fixation" shall be understood in a broad sense. For example, "fixation" can be a fixed connection, a detachable connection, or an integral one; "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 communication inside 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.

[0054] See Figures 1 to 2 , the present invention provides an external flexible rotary pyrolysis device, which includes a pyrolysis furnace 1, a rotating shaft 2, a driver 3, a flexible reaction cage 4 and a plurality of flexible scrapers 5. Among them, the pyrolysis furnace 1 is a horizontally placed hollow cylinder; a feed port 11 is axially opened at the top of the pyrolysis furnace 1 for feeding strip-shaped waste; a discharge port 12 is axially arranged at the bottom of the pyrolysis furnace 1 for discharging the scraped coke and waste residue, and an air outlet 13 is arranged at the top of the side of the pyrolysis furnace 1 for discharging pyrolysis gas. In a preferred embodiment, the feed port 11 is a rectangular opening at the top of the pyrolysis furnace 1, the length direction of the feed port 11 extends along the axis of the pyrolysis furnace 1, and a gate is arranged on the feed port 11 or the feed port 11 is connected to a feeding device. The discharge port 12 is a rectangular opening at the bottom of the pyrolysis furnace 1, the discharge port 12 is directly below the feed port 11, the length of the discharge port 12 is greater than the length of the feed port 11, and the discharge port 12 is connected to a solid collection system. The air outlet 13 is located at the top of one end of the pyrolysis furnace 1, and the air outlet 13 is connected to a separation and condensation system. In addition, a heat exchange flue is arranged outside the pyrolysis furnace 1 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 self-heating of the pyrolysis furnace 1.

[0055] The rotating shaft 2 is coaxially arranged on the opposite end faces of the pyrolysis furnace 1 and can rotate in the pyrolysis furnace 1, and the rotating shaft 2 extends from the head end to the tail end of the pyrolysis furnace 1. The driver 3 uses a motor to connect and drive the rotating shaft 2 to rotate. In addition, in a preferred embodiment, a dynamic sealing ring can also be provided to perform shaft sealing at the junction of the rotating shaft 2 and the pyrolysis furnace 1.

[0056] The flexible reaction cage 4 includes a plurality of support surfaces 41 arranged at intervals along the axis on the rotating shaft 2 and a flexible reaction net 42 supported by the plurality of support surfaces 41. All the flexible scrapers 5 are flat strip-shaped elastic structures, one end of the flexible scraper 5 is fixed on the inner surface of the circumferential wall of the pyrolysis furnace 1 and the other end can contact the flexible reaction net 42, that is, the length of the flexible scraper 5 is greater than the gap width between the support surface 41 and the inner surface of the circumferential wall of the pyrolysis furnace 1.

[0057] Specifically, the supporting surfaces 41 are all perpendicular to the rotating shaft 2. Each supporting surface 41 includes multiple wing rods 411 located in the same plane and extending radially outward from the rotating shaft 2 (see Figure 2 ). The free ends of the wing rods 411 of adjacent supporting surfaces 41 are connected to each other by multiple flexible wires 421, and the multiple flexible wires 421 together form a flexible reaction net 42. Among them, there are various connection methods for the flexible wires 421. Specifically, see Figures 3 to 5 , and there can be parallel, broken line or cross connection methods. In a preferred embodiment, the gap between the free end of the wing rod 411 and the inner surface of the circumferential wall of the pyrolysis furnace 1 is 20 - 50 mm, and the length of the flexible scraper 5 is 5 - 10 mm larger than the gap. In addition, the lengths of all the wing rods 411 are all the same or at least partially different. Among them, the flexible wire 421 is a stainless steel fine wire, a silicon aluminum fiber wire or an aramid fiber wire, etc.; the flexible scraper 5 is a stainless steel thin sheet.

[0058] The strip-shaped waste enters the flexible reaction cage 4. As the temperature rises, the raw material is heated and softened, winds and adheres to the flexible wires 421 of the flexible reaction cage 4 and simultaneously starts to pyrolyze. The flexible reaction cage 4 continuously rotates driven by the rotating shaft 2, so that the raw material is completely pyrolyzed when it moves to the lower part of the pyrolysis furnace 1; below the pyrolysis furnace 1, the flexible scraper 5 collides with the flexible wires 421 intermittently, generating elastic high-frequency vibration, and using the vibration and scraping action to remove the coke and waste residue remaining on the surface of the flexible reaction cage 4, and realizing automatic discharging by gravity.

[0059] Refer to again Figure 2 , multiple flexible scrapers 5 are evenly distributed below the flexible reaction cage 4 and on the opposite sides of the discharge port 12; on the inner surface of the circumferential wall of the pyrolysis furnace 1, the interval between adjacent flexible scrapers 5 is at least 10 mm. Among them, the multiple flexible scrapers 5 are divided into multiple groups, and a group of flexible scrapers 5 is arranged below the area between adjacent supporting surfaces 41 to avoid the flexible scrapers 5 directly colliding with the wing rods 411. In addition, the axial interval between adjacent supporting surfaces 41 can preferably be equal, and the axial interval can be 100 - 300 mm.

[0060] The technical solution of the present invention will be further described based on the optimal embodiments. Specifically, the inner diameter of the pyrolysis furnace 1 is 1000 mm, the length is 1500 mm, and the shaft diameter of the rotating shaft 2 is 200 mm. The flexible reaction cage 4 internally includes 8 support surfaces 41, and the axial interval between two adjacent support surfaces 41 is 200 mm. The flexible scraper 5 is a flat strip-shaped elastic stainless steel sheet, one end of which is fixed to the lower side of the inner surface of the pyrolysis furnace 1. The length of each flexible scraper 5 is 60 mm, the width is 10 mm, and the thickness is 0.2 mm. A plurality of flexible scrapers 5 are evenly arranged on the lower surface of the pyrolysis furnace area corresponding between two adjacent support surfaces 41, and at most 7 groups are distributed axially; and on the circular cross-section of the pyrolysis furnace 1, on the opposite sides of the discharge port 12, 6 flexible scrapers 5 are distributed at intervals circumferentially on each side. 40 wing rods are arranged on each support surface 41, and the rod diameter of the wing rod is 8 mm. The flexible wire is made of stainless steel wire and can be connected in various ways such as parallel type ( Figure 3 ), broken line type ( Figure 4 ), cross type ( Figure 5 ), etc. Such a clever setting can enable the flexible scraper 5 to achieve the optimal efficiency when scraping and removing the coke and waste residue remaining on the surface of the flexible reaction cage.

[0061] In order to better implement the above technical solution, the present invention also provides a catalytic pyrolysis method for strip-shaped organic waste, using the above external flexible rotary pyrolysis device to pyrolyze strip-shaped organic waste. The steps include:

[0062] S1. Drive the driver 3 to drive the rotating shaft 2 and the flexible reaction cage 4 to rotate at a set speed, and at the same time heat the pyrolysis furnace 1 to a set temperature;

[0063] S2. The strip-shaped waste raw material enters the pyrolysis furnace 1 from the feed port 11 and falls on the flexible reaction cage 4. As the temperature rises, the raw material softens and adheres to the flexible wire 421 and undergoes pyrolysis;

[0064] S3. The flexible reaction cage 4 continuously rotates driven by the rotating shaft 2, so that the raw material located above the pyrolysis furnace 1 moves to the bottom of the pyrolysis furnace 1 with the flexible reaction cage 4 and is gradually completely pyrolyzed;

[0065] S4. At the bottom of the pyrolysis furnace 1, the flexible scraper 5 collides with the flexible reaction cage 4 intermittently, generating elastic high-frequency vibrations. The coke and waste residue remaining on the surface of the flexible reaction cage 4 are removed by the intermittent vibration of the flexible wire 421 and the scraping of the flexible scraper 5, and automatically discharged from the discharge port 12 through the gaps of the flexible reaction cage 4 under the action of gravity;

[0066] S5. The generated pyrolysis gas is discharged through the gas outlet 13, and then through condensation and separation, a liquid product and non-condensable gas are obtained.

[0067] Among them, in order to improve the pyrolysis efficiency of raw materials, the set temperature of the pyrolysis furnace 1 is 300 - 800 °C, and the rotation speed of the rotating shaft 2 is set to 1 - 15 r / min, so that the conditions such as the temperature and reaction time in the pyrolysis process can conform to the optimal pyrolysis environment of specific strip-shaped raw materials as much as possible, thereby improving the pyrolysis conversion rate of 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 embodiments. The devices used in each embodiment have basically the same structure.

[0068] Example 1

[0069] For strip-shaped waste paper raw materials, since the area of waste paper is usually large and a larger gap of the flexible reaction cage 4 is allowed, the Figure 3 parallel-type flexible wire connection method shown in the figure is selected; the length of the wing rod 411 is set to 360 mm, that is, the distance between the free end of the wing rod 411 and the inner surface of the circumferential wall of the pyrolysis furnace 1 is 40 mm.

[0070] Waste paper strips with a length not exceeding 200 mm are fed into the pyrolysis furnace 1. The temperature of the pyrolysis furnace 1 is set to 450 °C, and the rotation speed of the rotating shaft 2 is 2 r / min. After one round of pyrolysis, the pyrolysis gas is collected and quickly separated and condensed. The liquid phase yield is 45.6%, and the target product levoglucosenone accounts for 10.5 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 4 rotates one circle, the residues generated by the pyrolysis of waste paper strips are basically scraped clean, effectively preventing the problems of raw material adhesion blockage and coking and slagging.

[0071] Example 2

[0072] For strip-shaped waste textile raw materials, since the sizes of waste textiles are usually different and a smaller gap of the flexible reaction cage 4 is required, the Figure 4 broken-line-type flexible wire connection method shown in the figure is selected; the length of the wing rod 411 is set to 360 mm, that is, the distance between the free end of the wing rod 411 and the inner surface of the circumferential wall of the pyrolysis furnace 1 is 40 mm.

[0073] Waste jeans processing waste with a length not exceeding 200 mm is fed into the pyrolysis furnace 1. The temperature of the pyrolysis furnace 1 is set to 700 °C, and the rotation speed of the rotating shaft 2 is 1 r / min. After one round of pyrolysis, the pyrolysis gas is collected and quickly separated and condensed. 44.7% of the non-condensable gas is collected, realizing the efficient disposal and utilization of waste jeans processing waste. At the same time, after the flexible reaction cage 4 rotates one circle, the residues generated by the pyrolysis of waste jeans processing waste are basically scraped clean, effectively preventing the problems of raw material adhesion blockage and coking and slagging.

[0074] Example 3

[0075] For waste plastic wire raw materials, since waste plastic wires are usually thin, to avoid the raw materials directly leaking through the gaps of the flexible reaction cage 4, the cross-shaped flexible wire connection method shown in Figure 5 is selected; the length of the wing rod 411 is set to 360 mm, that is, the distance 40 mm between the free end of the wing rod 411 and the inner surface of the circumferential wall of the pyrolysis furnace 1.

[0076] PET waste plastic wires with a length not exceeding 200 mm are fed into the pyrolysis furnace 1, the temperature of the pyrolysis furnace 1 is set to 500 °C, and the rotation speed of the rotating shaft 2 is 5 r / min. After one round of pyrolysis, the pyrolysis gas is collected and rapidly separated and condensed. The liquid phase yield is 35.1%, and the yield of the target product benzoic acid reaches 28.2 wt%, realizing the efficient disposal and utilization of waste plastic wires. At the same time, after the flexible reaction cage 4 rotates one circle, the residues generated by the pyrolysis of the waste plastic wires are basically scraped clean, effectively preventing the problems of raw material adhesion blockage and coking and slagging.

[0077] Example 4

[0078] For waste tire raw materials, since waste tire rubber strips are usually bent irregularly, the broken line-shaped (broken line-shaped when observed radially) flexible wire connection method shown in Figure 4 is selected; the difference between this example and Example 1 is that the lengths of the wing rods 411 are different. The wing rods of 380 mm and 330 mm are arranged at intervals to form a flexible reaction cage surface with different heights in a wave shape (wave shape when observed axially), which is convenient for irregular raw materials to adhere.

[0079] Waste tire strips with a length not exceeding 200 mm are fed into the pyrolysis furnace 1, the temperature of the pyrolysis furnace 1 is set to 600 °C, and the rotation speed of the rotating shaft 2 is 4 r / min. After one round of pyrolysis, the pyrolysis gas is collected and rapidly separated and condensed. The liquid phase yield is 38.6%, and the proportion of the target aromatic hydrocarbon product in the liquid phase product is 16.5 wt%, realizing the efficient disposal and utilization of waste tire strips. At the same time, after the flexible reaction cage 4 rotates one circle, the residues generated by the pyrolysis of the waste tire strips are basically scraped clean, effectively preventing the problems of raw material adhesion blockage and coking and slagging.

[0080] It should be understood that the above description of the specific embodiments of the present invention is only for explaining the technical route and characteristics 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. All 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 external flexible rotary pyrolysis device, characterized in that The external flexible rotary pyrolysis device includes: a pyrolysis furnace (1), a rotating shaft (2), a driver (3), a flexible reaction cage (4), and a plurality of flexible scrapers (5); The pyrolysis furnace (1) is a horizontally placed hollow cylindrical structure, and the pyrolysis furnace (1) is provided with a feed inlet (11), a discharge outlet (12), and a gas outlet (13); the rotating shaft (2) is coaxially arranged on the opposite end faces of the pyrolysis furnace (1), and the driver (3) can drive the rotating shaft (2) to rotate; The flexible reaction cage (4) includes a plurality of support surfaces (41) arranged at intervals along the axial direction on the rotating shaft (2), and a flexible reaction net (42) supported by the plurality of support surfaces (41); All the flexible scrapers (5) are flat strip-shaped elastic structures, one end of the flexible scraper (5) is fixed on the inner surface of the circumferential wall of the pyrolysis furnace (1), and the other end can contact the flexible reaction net (42).

2. The external flexible rotary pyrolysis device according to claim 1, wherein The support surfaces (41) are all perpendicular to the rotating shaft (2), and each support surface (41) includes a plurality of wing rods (411) located in the same plane and extending radially outward from the rotating shaft (2). The free ends of the wing rods (411) of adjacent support surfaces (41) are connected to each other by a plurality of flexible wires (421), and the plurality of flexible wires (421) together form the flexible reaction net (42).

3. The external flexible rotary pyrolysis device according to claim 1, characterized in that, The feed inlet (11) is a rectangular opening at the top of the pyrolysis furnace (1), the length direction of the feed inlet (11) extends along the axial direction of the pyrolysis furnace (1), and a gate is provided on the feed inlet (11) or the feed inlet (11) is connected to a feeding device; The discharge outlet (12) is a rectangular opening at the bottom of the pyrolysis furnace (1), the discharge outlet (12) is directly below the feed inlet (11), the length of the discharge outlet (12) is greater than the length of the feed inlet (11), and the discharge outlet (12) is connected to a solid collection system; The gas outlet (13) is located at the top of one end of the pyrolysis furnace (1), and the gas outlet (13) is connected to a separation and condensation system.

4. The external flexible rotary pyrolysis device according to claim 3, characterized in that, A plurality of the flexible scrapers (5) are evenly distributed below the flexible reaction cage (4) and on opposite sides of the discharge outlet (12); on the inner surface of the circumferential wall of the pyrolysis furnace (1), the interval between adjacent flexible scrapers (5) is at least 10 mm.

5. The external flexible rotary pyrolysis device according to claim 1, characterized in that, The plurality of flexible scrapers (5) are divided into multiple groups, and a group of flexible scrapers (5) is arranged below the area between adjacent support surfaces (41).

6. The external flexible rotary pyrolysis device according to any one of claims 1-5, characterized in that The axial interval between adjacent support surfaces (41) is equal, and the axial interval is 100 - 300 mm.

7. The external flexible rotary pyrolysis device according to any one of claims 1-5, characterized in that The gap between the free end of the wing rod (411) and the inner surface of the circumferential wall of the pyrolysis furnace (1) is 20 - 50 mm, and the length of the flexible scraper (5) is 5 - 10 mm larger than the gap.

8. The external flexible rotary pyrolysis device according to any one of claims 1-5, characterized in that, The lengths of all the wing rods (411) are all the same or at least partially different.

9. The external flexible rotary pyrolysis device according to any one of claims 1-5, characterized in that, The flexible wire (421) is a stainless steel fine wire, a silicon aluminum fiber wire, or an aramid fiber wire; And / or, the flexible scraper (5) is a stainless steel sheet.

10. A catalytic pyrolysis method, which is implemented based on the external flexible rotary pyrolysis device according to any one of claims 1-9, characterized in that, The catalytic pyrolysis method comprises the following steps: S1. Drive the driver (3) to drive the rotating shaft (2) and the flexible reaction cage (4) to rotate at a set speed, and at the same time heat the pyrolysis furnace (1) to a set temperature; S2. The raw material enters the pyrolysis furnace (1) from the feed inlet (11) and lands on the flexible reaction cage (4). As the temperature rises, the raw material softens and adheres to the flexible filaments (421) and undergoes pyrolysis; S3. The flexible reaction cage (4) continuously rotates driven by the rotating shaft, so that the raw material located above the pyrolysis furnace (1) moves to the bottom of the pyrolysis furnace (1) along with the flexible reaction cage (4); S4. At the bottom of the pyrolysis furnace (1), the flexible scraper (5) intermittently collides with the flexible reaction cage (4) to remove the coke and waste residue remaining on the surface of the flexible reaction cage (4), and passes through the flexible reaction cage (4) under the action of gravity and is automatically discharged from the discharge outlet (12); S5. The generated pyrolysis gas is discharged through the gas outlet (13), and then through condensation and separation, a liquid product and a non-condensable gas are obtained.

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