Pyrolysis treatment device for oil-containing sludge

Abstract

This invention relates to the field of resource recycling technology and discloses a pyrolysis treatment device for oily sludge. The device includes a rotary kiln body with a buffer cylinder inside the discharge end. Multiple discharge holes are circumferentially formed on the side wall of the cylinder. A circular plate is located at the end of the cylinder away from the buffer cylinder. Multiple crushing blades are fixedly installed on the side of the circular plate facing the cylinder. A connecting shaft is fixedly connected to the other side of the circular plate, and a counterweight is fixedly connected to the end of the connecting shaft. The buffer cylinder, located at the rear of the kiln body, physically slows down the material, extending its residence time in the high-temperature section. Large pieces of material enter the discharge trough through the discharge holes and are then cut and crushed online by the serrated crushing blades in axial reciprocating motion. This increases the specific surface area and heating area of ​​the material, significantly improving pyrolysis efficiency and resource recovery rate without extending the overall pyrolysis time. This ensures long-term stable operation of the pyrolysis process and stable compliance of the oil content in the solid residue.

Description

Technical Field

[0001] This invention relates to the field of resource recycling technology, and in particular to a pyrolysis treatment device for oily sludge. Background Technology

[0002] Rotary kiln pyrolysis technology has been widely used in the treatment of oily sludge due to its large processing capacity, wide material adaptability, and high energy recovery efficiency. During equipment operation, oily sludge is fed into the rotary kiln cylinder from the feed end. Relying on the inclined structure of the cylinder and continuous rotation, the material is pushed towards the discharge end, sequentially completing processes such as drying, preliminary pyrolysis, and deep pyrolysis.

[0003] However, this process still faces challenges in practical application. After drying and preliminary pyrolysis in the front and middle sections of the kiln, a large amount of internal moisture and light oil evaporates, transforming the material from a dense state to a loose and porous state, significantly increasing its fluidity. When it enters the deep pyrolysis zone in the rear section of the kiln, its propulsion speed increases significantly under the combined effects of gravity and the kiln's rotation. This rear section is crucial for ensuring sufficient residence time to guarantee the complete decomposition of organic components. Insufficient residence time will result in some organic components failing to completely decompose and being discharged with the residue, reducing the recovery rate of pyrolysis oil and combustible gases and potentially making it difficult to consistently meet the oil content standards for solid residues, thus affecting the overall treatment effect.

[0004] To address the aforementioned issues, existing technologies include solutions that incorporate built-in components such as baffle rings and fixed spiral blades on the inner wall of the kiln's discharge end, attempting to slow material movement through physical obstruction. However, such fixed structures have limited effectiveness in obstructing loose, highly fluid materials, making it difficult to precisely control the material propulsion rate in the later stages. Therefore, existing solutions still have room for improvement in addressing the control of material flow rate and the sufficiency of pyrolysis in the later stages. Summary of the Invention

[0005] Given the problems of existing rotary kilns, such as high flow rate and insufficient residence time of loose sludge in the later stage, inability to accurately control the speed of fixed baffle components, insufficient pyrolysis, and low oil and gas recovery rate, a pyrolysis treatment device for oily sludge is proposed.

[0006] Its purpose is to slow down the material movement speed by using a slowing cylinder, and to bring the material into contact with the crushing blade when the slowing cylinder rotates, thereby cutting the material into pieces, increasing the pyrolysis area of ​​the material and improving the pyrolysis efficiency.

[0007] The technical solution of this invention is a pyrolysis treatment device for oily sludge, comprising a rotary kiln body. A buffer cylinder is provided inside the discharge end of the rotary kiln body. The buffer cylinder has a frustum-shaped structure, with its large end fixedly connected to the inner wall of the rotary kiln body and its small end fixedly connected to a cylinder. Multiple material discharge holes are provided circumferentially on the side wall of the cylinder. A circular plate is provided at the end of the cylinder away from the buffer cylinder. Multiple crushing blades are fixedly installed on the side of the circular plate facing the cylinder. The multiple crushing blades are spaced apart circumferentially along the circular plate and located within the circular... Below the cylinder, a connecting shaft is fixedly connected to the other side of the circular plate. The connecting shaft is movably connected to the inner wall of the rotary kiln cylinder, and a counterweight is fixedly connected to the end of the connecting shaft. An annular plate is provided inside the cylinder. One end of the annular plate is fixedly connected to the circular plate. A wavy annular groove is opened on the outer wall of the annular plate. Multiple guide wheels are installed on the inner wall of the cylinder. The guide wheels are in rolling cooperation with the annular groove. When the slowing cylinder rotates with the rotary kiln cylinder, it drives the circular plate to move axially. The crushing blade cooperates with the discharge hole to cut the material into pieces.

[0008] Furthermore, the crushing blade includes a blade holder fixedly connected to the side wall of the circular plate, and a blade is fixedly mounted on the blade holder, the blade being serrated.

[0009] Furthermore, the coupling sleeve is provided with a fixed cylinder, and a fixed frame is fixedly connected to the outer wall of the fixed cylinder. The fixed frame is fixedly installed on the inner wall of the rotary kiln cylinder. Fixed rings are fixedly connected to both ends of the fixed cylinder. Multiple balls are rotatably connected in a ring at equal intervals inside the fixed rings. The balls are in rolling contact with the outer wall of the coupling.

[0010] Furthermore, the circular plate has multiple ventilation holes.

[0011] Furthermore, a material discharge chute is fixedly connected to the outer wall of the cylinder, and the material discharge chute has an L-shaped cross-section.

[0012] Furthermore, a frustum-shaped extrusion plate is fixedly connected to the side of the annular plate facing the buffer cylinder, with the small end of the extrusion plate facing the buffer cylinder, and multiple anti-retraction teeth are fixedly provided on the inner wall of the cylinder.

[0013] Furthermore, the buffer cylinder has multiple screen holes at one end near the cylinder, and multiple connecting rods are hinged to the outer wall of the buffer cylinder circumferentially. Multiple top rods are fixedly connected to each connecting rod, and each top rod passes through the corresponding screen hole.

[0014] Furthermore, the push rod and the sieve hole are fitted with a clearance, and the end of the push rod can extend or retract into the corresponding sieve hole when the connecting rod swings, so as to clear the sieve hole.

[0015] Compared with the prior art, the present invention has the following beneficial effects: 1. The slowing cylinder is set at the rear of the kiln body to physically decelerate the material and extend its residence time in the high-temperature section. The rotation of the kiln body drives the circular plate to move axially back and forth. Large pieces of material enter the discharge chute through the discharge hole and are cut and crushed online by the sawtooth crusher in the axial back and forth motion. This increases the specific surface area and heating area of ​​the material, which greatly improves the pyrolysis efficiency and resource recovery rate without extending the overall pyrolysis time. This ensures the long-term stable operation of the pyrolysis process and the stable compliance of the oil content of the solid residue.

[0016] 2. During the axial movement of the original plate, the extrusion plate moves synchronously. The conical surface of the extrusion plate applies extrusion force to the material, so that large pieces of material are pre-crushed before the cutting process, reducing the subsequent cutting load. At the same time, small particles formed in the pyrolysis of the first and middle sections can be screened out through the sieve holes to avoid entering the crushing stage, further improving crushing efficiency and pyrolysis efficiency. Attached Figure Description

[0017] Figure 1 This is a three-dimensional schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the transversely disassembled structure of the buffer cylinder and circular plate of the present invention; Figure 3 This is a schematic cross-sectional view of the material buffer cylinder, cylinder, and circular plate structure of the present invention; Figure 4 This is a schematic diagram of the cylindrical and crushing blade structure of the present invention; Figure 5 This is a schematic diagram of the crusher blade structure of the present invention; Figure 6 This is a schematic diagram of the coupling and fixing cylinder structure of the present invention; Figure 7 This is a schematic diagram of the slowing cylinder, connecting rod, and push rod structure of the present invention; Figure 8 For the present invention Figure 7 Enlarged schematic diagram of the structure at point A in the middle.

[0018] In the picture: 1. Rotary kiln body; 2. Feeding cylinder; 3. Cylinder; 4. Discharge hole; 5. Circular plate; 6. Crusher; 61. Cutter holder; 62. Blade; 7. Connecting shaft; 8. Counterweight; 9. Screen hole; 10. Fixed cylinder; 11. Fixed frame; 12. Fixed ring; 13. Ball bearing; 14. Ventilation hole; 15. Annular plate; 16. Annular groove; 17. Guide wheel; 18. Discharge chute; 19. Extrusion plate; 20. Anti-reverse tooth; 21. Connecting rod; 22. Top rod. Detailed Implementation

[0019] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0020] Example 1, referring to Figures 1-7 This is the first embodiment of the present invention, providing a pyrolysis treatment device for oily sludge, including a rotary kiln body 1. A buffer cylinder 2 is provided inside the discharge end of the rotary kiln body 1. The buffer cylinder 2 has a frustum-shaped structure, with its large end fixedly connected to the inner wall of the rotary kiln body 1 and its small end fixedly connected to a cylinder 3. Multiple material discharge holes 4 are opened circumferentially on the side wall of the cylinder 3. A circular plate 5 is provided at the end of the cylinder 3 away from the buffer cylinder 2. Multiple crushing blades 6 are fixedly installed on the side of the circular plate 5 facing the cylinder 3. The multiple crushing blades 6 are distributed at intervals along the circumference of the circular plate 5 and are located in the circular... Below cylinder 3, a connecting shaft 7 is fixedly connected to the other side of circular plate 5. The connecting shaft 7 is movably connected to the inner wall of rotary kiln cylinder 1, and a counterweight 8 is fixedly connected to the end of the connecting shaft 7. An annular plate 15 is provided inside cylinder 3. One end of the annular plate 15 is fixedly connected to circular plate 5. A wavy annular groove 16 is opened on the outer wall of the annular plate 15. Multiple guide wheels 17 are installed on the inner wall of cylinder 3. The guide wheels 17 and the annular groove 16 roll in cooperation. When the slowing cylinder 2 rotates with rotary kiln cylinder 1, it drives circular plate 5 to move axially. The crushing knife 6 cooperates with the discharge hole 4 to cut the material into pieces.

[0021] Specifically, during operation, the slowing cylinder 2 rotates synchronously with the rotary kiln body 1. Since the inner wall of the slowing cylinder 2 is inclined in the same direction as the inner wall of the rotary kiln body 1, and the slope of the inner wall of the slowing cylinder 2 is less than that of the rotary kiln body 1, the movement speed of the blocky material formed after the pyrolysis treatment in the first and middle sections is effectively slowed down after entering the slowing cylinder 2, thereby prolonging the residence time of the material in the high-temperature pyrolysis section and ensuring that the organic components are more fully decomposed. Subsequently, the material enters the cylinder 3. When the cylinder 3 rotates with the rotary kiln body 1, it drives the guide wheel 17 on its inner wall to rotate synchronously. The guide wheel 17 rolls and engages with the wavy annular groove 16 on the outer wall of the annular plate 15, driving the annular plate 15 and the circular plate 5 fixedly connected to it to produce axial reciprocating motion. At the same time, the connecting shaft 7 on the other side of the circular plate 5 cannot follow the rotation of the cylinder body due to the inertial limiting effect of the end counterweight 8, thereby ensuring that the circular plate 5 only moves axially and does not rotate circumferentially. During this process, multiple crushing blades 6 fixed on the circular plate 5 reciprocate axially with the plate 5, repeatedly cutting the blocky material falling from the discharge hole 4 into small particles, thereby increasing the specific surface area and heating area of ​​the material. This device, through the synergistic effect of slowing down the material flow rate and online crushing, significantly improves pyrolysis efficiency and resource recovery rate without extending the overall pyrolysis time. Simultaneously, its simple structure allows for adaptive crushing without an external power source, effectively preventing blockage at the discharge end and ensuring long-term stable operation of the pyrolysis process and consistently meeting the oil content standards for solid residues.

[0022] Understandably, the rotary kiln shell 1 is arranged at an angle. Its upper port is connected to the conveying mechanism for oily sludge, through which the oily sludge to be treated is fed into the rotary kiln shell 1. Its lower port is connected to the material collection mechanism and the oil and gas pipeline. The solid residue after pyrolysis is discharged into the material collection mechanism through the lower port, while the high-temperature oil and gas and water vapor generated by pyrolysis are led out through the oil and gas pipeline and enter the subsequent condensation recovery and purification system. The slowing cylinder 2 is fixedly installed in the inner wall of the rotary kiln shell 1 near the lower port, that is, in the high-temperature pyrolysis area of ​​the rear section of the rotary kiln shell 1, to receive the lumpy material flowing in after the pyrolysis treatment in the front and middle sections, and to perform flow rate slowing and particle size classification pretreatment on it. The rotary kiln body 1 adopts a jacketed heating method and is divided into a preheating and drying section, a main pyrolysis section and a deep pyrolysis section along its axial direction. Each section is equipped with an independent heating jacket, and each heating jacket is connected to a corresponding heat source (such as a burner or hot air furnace) to achieve independent and precise control of the heating temperature of each section.

[0023] Reference Figure 2 , Figure 5 The crusher 6 includes a blade holder 61 fixedly connected to the side wall of the circular plate 5, and a blade 62 fixedly mounted on the blade holder 61. The blade 62 is serrated.

[0024] Specifically, the cutter holder 61 and the circular plate 5 can be fixed by welding or bolting to ensure the connection reliability of the crusher 6 when it is subjected to impact load during reciprocating motion. The blade 62 is detachably installed on the cutter holder 61 by bolts so that the worn blade 62 can be quickly replaced after long-term use, reducing maintenance costs.

[0025] The serrated structure of the blade 62 is continuously arranged along its length, and the tooth shape can be triangular, trapezoidal, or arc-shaped. During operation, when the crushing blade 6 reciprocates along the axial direction of the cylinder 3 with the circular plate 5, the serrated blade teeth alternately act on the blocky material falling from the discharge hole 4, forming a "sawing-scraping" combined action on the material. The serrated blade 62 has the following advantages: on the one hand, the tips of the serrations can more easily penetrate the surface of the material, reducing the initial cutting resistance; on the other hand, multiple tooth tips cut into different positions of the material in sequence, so that the material can generate cracks and gradually break along the serrated trajectory under relatively small local stress, thereby effectively preventing large pieces of material from being pushed out as a whole or stuck at the discharge hole 4 during the cutting process.

[0026] Reference Figure 2 , Figure 3 as well as Figure 6The coupling shaft 7 is fitted with a fixed cylinder 10. A fixed frame 11 is fixedly connected to the outer wall of the fixed cylinder 10. The fixed frame 11 is fixedly installed on the inner wall of the rotary kiln body 1. Fixed rings 12 are fixedly connected to both ends of the fixed cylinder 10. Multiple balls 13 are rotatably connected in a ring at equal intervals inside the fixed ring 12. The balls 13 roll in contact with the outer wall of the coupling shaft 7.

[0027] Specifically, the ball bearing 13 provides radial support and axial guidance to the connecting shaft 7, allowing the connecting shaft 7 to move axially and rotate radially within the fixed cylinder 10. When the guide wheel 17 rotates with the cylinder 3 and rolls into contact with the wavy annular groove 16 on the outer wall of the annular plate 15, the crests and troughs of the wavy annular groove 16 alternately push the guide wheel 17. Since the connecting shaft 7 is restricted from circumferential rotation by the counterweight 8 and only retains axial freedom, the annular plate 15 and the circular plate 5 fixedly connected to it cannot rotate with the cylinder 3, but instead convert the rolling driving force of the guide wheel 17 into its own axial reciprocating motion.

[0028] Reference Figure 2 , Figure 3 The circular plate 5 has multiple ventilation holes 14.

[0029] Specifically, the ventilation hole 14 ensures that the high-temperature oil and gas and water vapor generated by pyrolysis in the rotary kiln cylinder 1 can be smoothly discharged to the discharge end, effectively avoiding the increase in kiln pressure or the obstruction of airflow caused by the circular plate 5, thereby maintaining the stability of the heat field and airflow distribution in the kiln, which is conducive to the continuous and uniform progress of the pyrolysis reaction.

[0030] Reference Figure 3 , Figure 4 The outer wall of the cylinder 3 is fixedly connected to a material discharge chute 18, which has an L-shaped cross-section.

[0031] Specifically, the material discharge trough 18 extends along the axial direction of the cylinder 3, and its length at least covers the distribution area of ​​the material discharge holes 4 to ensure that all materials falling from the material discharge holes 4 can fall into the material discharge trough 18. The L-shaped cross-section of the material discharge trough 18 includes a vertical receiving section and a horizontal supporting section, wherein the vertical receiving section is fixedly connected to the outer wall of the cylinder 3, and the horizontal supporting section extends away from the outer wall of the cylinder 3 to form a receiving platform.

[0032] During operation, the blocky material falling from the discharge hole 4 falls onto the horizontal support section of the discharge chute 18 under the action of gravity. Since the discharge chute 18 is fixedly connected to the outer wall of the cylinder 3 and rotates synchronously with the cylinder 3, the position of the discharge chute 18 is relatively fixed directly below the discharge hole 4, so that the crushing blade 6 can accurately act on the blocky material on the support surface of the discharge chute 18 during the axial reciprocating motion, and perform full and directional reciprocating cutting on the material.

[0033] Example 2, refer to Figure 7 , Figure 8This is the second embodiment of the present invention. The difference between this embodiment and the first embodiment is that: an extrusion plate 19 with a frustum-shaped structure is fixedly connected to the side of the annular plate 15 facing the buffer cylinder 2, the small end of the extrusion plate 19 faces the side of the buffer cylinder 2, and a plurality of anti-retraction teeth 20 are fixedly provided on the inner wall of the cylinder 3.

[0034] Specifically, as the material travels along the inside of the cylinder 3, the extrusion plate 19 moves axially synchronously with the circular plate 5, applying extrusion force to the material by relying on its own conical surface, completing the pre-crushing of the material before the cutting process, and reducing the subsequent cutting load; the anti-reverse tooth 20 can increase the frictional limiting effect between itself and the material, and work together with the extrusion plate 19 to improve the pre-crushing treatment effect.

[0035] Reference Figure 7 The slowing cylinder 2 has multiple screen holes 9 at one end near the cylinder 3. Multiple connecting rods 21 are hinged to the outer wall of the slowing cylinder 2 in the circumferential direction. Multiple top rods 22 are fixedly connected to each connecting rod 21, and each top rod 22 passes through the corresponding screen hole 9.

[0036] Specifically, the aperture of screen 9 is smaller than that of discharge hole 4. As the material slowly moves towards the discharge end within the buffer cylinder 2, smaller particles can pass through screen 9 first and be discharged directly into the discharge end. Only larger, blocky particles continue to move along the inner wall of the buffer cylinder 2 towards the cylinder 3, thus achieving particle size classification pretreatment of the material. Through the pre-screening of screen 9, the material entering the cylinder 3 is all large, agglomerated material, reducing the processing burden on discharge hole 4 and crusher 6. At the same time, fine materials can be discharged directly without crushing, shortening their residence time in the kiln. This avoids over-crushing and further improves the overall processing efficiency of the machine.

[0037] One end of the connecting rod 21 is rotatably connected to the outer wall of the slowing cylinder 2 via a hinge seat, while the other end is a free end. As the slowing cylinder 2 rotates with the rotary kiln cylinder 1, the connecting rod 21 swings back and forth around the hinge point under its own gravity. Each push rod 22 is fixedly connected to the connecting rod 21 and moves back and forth through the screen holes 9 to clean them as the connecting rod 21 swings, effectively preventing high-viscosity materials from clogging the screen holes 9 and ensuring the continuous effectiveness of the screening process.

[0038] Reference Figure 7 The push rod 22 is fitted with a clearance between itself and the sieve hole 9. The end of the push rod 22 can extend or retract the corresponding sieve hole 9 when the connecting rod 21 swings, so as to clear the sieve hole 9.

[0039] Specifically, the connecting rod 21 rotates with the buffer cylinder 2. When the connecting rod 21 is below the buffer cylinder 2, it rotates downwards, causing the top rod 22 to leave the screen hole 9. Small particles can then pass through the screen hole 9 and leave the buffer cylinder 2. When the connecting rod 21 is above the buffer cylinder 2, it rotates under gravity until it contacts the outer wall of the buffer cylinder 2. At this time, the top rod 22 inserts into the corresponding screen hole 9 to clear the screen hole 9 and ensure continuous screening effect. The remaining structure is the same as that in Example 1.

[0040] Based on embodiments 1-2, the working principle of this invention is as follows: During operation, the rotary kiln cylinder 1 drives the slowing cylinder 2 and the cylindrical cylinder 3 to rotate synchronously. The lumpy material formed after pyrolysis in the front and middle sections enters the slowing cylinder 2. Because its inner wall slope is less than that of the rotary kiln cylinder 1, the material movement speed is slowed down, and the residence time in the high-temperature section is extended, ensuring that the organic components are fully decomposed. During the movement, smaller particle sizes are discharged first through the sieve holes 9, while larger pieces of material continue to be pushed into the cylindrical cylinder 3, achieving particle size classification pretreatment. At the same time, the connecting rod 21 swings back and forth with the rotation of the slowing cylinder 2 under the action of gravity, causing the top rod 22 to intermittently penetrate and clear the sieve holes 9 to prevent blockage. After large pieces of material enter the cylinder 3, they fall from the discharge hole 4 onto the horizontal support section of the discharge trough 18. During this process, the cylinder 3 drives the guide wheel 17 to rotate synchronously. The guide wheel 17 rolls in conjunction with the wave-shaped annular groove 16 on the outer wall of the annular plate 15, driving the annular plate 15 and the circular plate 5 to generate axial reciprocating motion. The connecting shaft 7 cannot rotate circumferentially due to the inertial limiting effect of the end counterweight 8, ensuring that the circular plate 5 only moves axially. The sawtooth-shaped crushing blade 6 fixed on the circular plate 5 moves axially back and forth with the circular plate 5, reciprocatingly sawing and scraping the blocky material on the support surface of the discharge trough 18, crushing it into small particles, increasing the specific surface area of ​​the material, which is conducive to the full progress of the subsequent pyrolysis reaction. The crushed small pieces of material slide down the discharge trough 18 to the inner wall of the rotary kiln cylinder 1 and continue to be conveyed to the discharge end. At the same time, the ventilation holes 14 on the circular plate 5 ensure that the oil and gas and water vapor generated by pyrolysis in the kiln are discharged smoothly, maintaining the stability of the heat field and airflow distribution in the kiln. This device achieves adaptive processing without an external power source through the synergistic effects of slowing down material flow rate, particle size classification and screening, and online crushing. It effectively improves pyrolysis efficiency and resource recovery rate, ensuring that the oil content of solid residue meets the standard and that the device operates stably for a long time.

[0041] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A pyrolysis treatment apparatus for oily sludge, comprising a rotary kiln (1), characterized in that, The rotary kiln body (1) has a slowing cylinder (2) inside the discharge end. The slowing cylinder (2) has a frustum-shaped structure. Its large end is fixedly connected to the inner wall of the rotary kiln body (1), and its small end is fixedly connected to a cylinder (3). The side wall of the cylinder (3) has multiple material dropping holes (4) along the circumference. The end of the cylinder (3) away from the slowing cylinder (2) is provided with a circular plate (5). Multiple crushing blades (6) are fixedly installed on the side of the circular plate (5) facing the cylinder (3). The multiple crushing blades (6) are distributed at intervals along the circumference of the circular plate (5) and located below the cylinder (3). The other side of the circular plate (5) is fixedly connected to a connecting shaft (7). The connecting shaft (7) is movably connected to the inner wall of the rotary kiln body (1), and a counterweight (8) is fixedly connected to the end of the connecting shaft (7). An annular plate (15) is provided inside the cylinder (3). One end of the annular plate (15) is fixedly connected to the circular plate (5). The outer wall of the annular plate (15) is provided with a wave-shaped annular groove (16). Multiple guide wheels (17) are installed on the inner wall of the cylinder (3). The guide wheels (17) and the annular groove (16) are in rolling cooperation. When the slowing cylinder (2) rotates with the rotary kiln cylinder (1), it drives the circular plate (5) to move axially. The crushing knife (6) cooperates with the discharge hole (4) to cut the material into pieces.

2. The pyrolysis treatment apparatus for oily sludge according to claim 1, characterized in that, The crushing blade (6) includes a blade holder (61) fixedly connected to the side wall of the circular plate (5), and a blade (62) is fixedly installed on the blade holder (61). The blade (62) is serrated.

3. The pyrolysis treatment apparatus for oily sludge according to claim 1, characterized in that, The connecting shaft (7) is fitted with a fixed cylinder (10), and a fixed frame (11) is fixedly connected to the outer wall of the fixed cylinder (10). The fixed frame (11) is fixedly installed on the inner wall of the rotary kiln body (1). Fixed rings (12) are fixedly connected to both ends of the fixed cylinder (10). Multiple balls (13) are rotatably connected in a ring at equal intervals inside the fixed ring (12). The balls (13) are in rolling contact with the outer wall of the connecting shaft (7).

4. The pyrolysis treatment apparatus for oily sludge according to claim 1, characterized in that, The circular plate (5) has multiple ventilation holes (14).

5. The pyrolysis treatment apparatus for oily sludge according to claim 1, characterized in that, The outer wall of the cylinder (3) is fixedly connected to a material discharge chute (18), and the cross-section of the material discharge chute (18) is L-shaped.

6. The pyrolysis treatment apparatus for oily sludge according to claim 1, characterized in that, The annular plate (15) is fixedly connected to a frustum-shaped extrusion plate (19) on the side facing the buffer cylinder (2). The small end of the extrusion plate (19) faces the buffer cylinder (2), and multiple anti-retraction teeth (20) are fixedly provided on the inner wall of the cylinder (3).

7. The pyrolysis treatment apparatus for oily sludge according to claim 1, characterized in that, The slowing cylinder (2) has multiple sieve holes (9) at one end near the cylinder (3). Multiple connecting rods (21) are hinged to the outer wall of the slowing cylinder (2) in the circumferential direction. Multiple top rods (22) are fixedly connected to each connecting rod (21), and each top rod (22) passes through the corresponding sieve hole (9).

8. The pyrolysis treatment apparatus for oily sludge according to claim 7, characterized in that, The top rod (22) is fitted with a clearance between it and the sieve hole (9). The end of the top rod (22) can extend or retract the corresponding sieve hole (9) when the connecting rod (21) swings, so as to clear the sieve hole (9).

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