Coal tar residue pyrolysis processing system and method

Abstract

Aiming at the problems of existing coal tar residue cracking treatment equipment, such as residue hanging on the inner wall of the furnace, incomplete cleaning of oil residue and dust on the surface of solid circulating medium, a coal tar residue cracking treatment system and method are provided. A coke removing ball is arranged in the cracking furnace body, one end of the cracking furnace body is connected with a feeding screw conveyor, one side of a primary separation box is provided with a separation screw conveyor, the separation screw blade extends into the primary separation box, an arc-shaped filter screen is arranged in the primary separation box below the separation screw blade, an oil removal screw conveyor is arranged below one side of the separation screw conveyor, a collecting box is connected with the oil removal screw conveyor away from the one end, and a bucket elevator for conveying the coke removing ball to a feeding box is arranged on one side of the collecting box. The problems of residue hanging on the inner wall of the furnace are effectively solved: the oil residue adhered to the furnace wall is timely taken away by arranging the coke removing ball in the cracking furnace body, so that the inner wall of the furnace is always kept clean, and the cleanliness and oil removal efficiency of the coke removing ball when it is put into circulation again are ensured.

Description

Technical Field

[0001] This invention relates to the field of capping machine equipment technology, and in particular to a coal tar residue pyrolysis treatment system and method. Background Technology

[0002] Coal tar residue is a solid waste generated during coal gas purification, coal tar processing, and coal chemical production. It mainly contains coal tar, semi-coke, coal powder, and moisture, and is classified as hazardous waste (HW11). Currently, common treatment methods for coal tar residue include landfill, incineration, and pyrolysis (cracking). Pyrolysis is widely used due to its ability to achieve resource utilization. This involves breaking down the large organic molecules in coal tar residue into smaller combustible gases, liquid fuel oil, and solid semi-coke under high-temperature, anaerobic, or oxygen-deficient conditions, thereby obtaining chemical products with reuse value. Existing coal tar residue pyrolysis equipment typically uses a horizontal rotary kiln structure. After the material is heated and pyrolyzed inside the furnace, the oil and gas are collected through a condensation system, and the residue is discharged through a slag discharge system. However, the following shortcomings exist in actual operation: the problem of slag adhering to the inner wall of the furnace is serious: during the cracking process of coal tar residue, some of the heavy oil and semi-coke residue produced are easy to adhere to the inner wall of the rotary kiln. As the operating time increases, the adhering material gradually thickens, which not only reduces the effective volume and heat transfer efficiency of the furnace, but also leads to local overheating, increased energy consumption, and even blockage of the discharge port, affecting the continuous and stable operation of the equipment. Summary of the Invention

[0003] To address the problems of easy slag buildup on the inner wall of the furnace body, incomplete cleaning of oil residue and dust on the surface of the solid circulating medium, and poor separation of furnace ash and solid medium in existing coal tar residue pyrolysis treatment equipment, a coal tar residue pyrolysis treatment system and treatment method are provided.

[0004] A coal tar residue pyrolysis treatment system includes a frame, a rotatable pyrolysis furnace body, shaftless spiral blades fixedly mounted on the inner wall of the furnace body, a heating device located on the outer side of the middle section of the furnace body, and coke removal balls inside the furnace body. One end of the furnace body is connected to a feed screw conveyor, which is rotatably connected to the furnace body. The other end of the furnace body is connected to a discharge body, which is also rotatably connected to the furnace body. A feed box is connected to the upper part of the feed screw conveyor, and a primary separation box is connected to the lower end of the discharge body. An oil / gas outlet is located at the upper end of the discharge body. A separation screw conveyor, including separation spiral blades, is located on one side of the primary separation box. The separation spiral blades extend into the primary separation box, and an installation device is located below the separation spiral blades. An arc-shaped filter screen is installed inside the separation chamber. A first separation pipe is provided at the end of the separation screw conveyor opposite to the separation chamber. An oil removal screw conveyor is provided below one side of the separation screw conveyor. A second separation pipe is connected to the upper part of the side of the oil removal screw conveyor near the first separation pipe. The first and second separation pipes are connected. The oil removal screw conveyor includes an oil removal outer shell. The oil removal outer shell is provided with a cleaning section and a drying section at intervals. Both the cleaning section and the drying section are provided with cleaning holes at the bottom. A spray box is provided in the cleaning section. The spray box is provided with multiple spray nozzles. A drying box is provided in the drying section. The drying box is provided with multiple gas nozzles. A collection box is connected to the end of the oil removal screw conveyor opposite to the separation chamber. A bucket elevator is provided on one side of the collection box to transport the decoking balls to the feed box.

[0005] Preferably, the lower part of the primary separation box is provided with an ash conveying screw conveyor, and the lower part of the primary separation box is connected to an ash discharge pipe. The ash discharge pipe is connected to the upper part of one side of the ash conveying screw conveyor located below it. The end of the ash conveying screw conveyor opposite to the ash discharge pipe is provided with an ash collection box, and the ash conveying screw conveyor is connected to the ash collection box through the ash conveying pipe.

[0006] Preferably, the separating screw conveyor further includes a separating outer shell, which is fixedly installed on one side of the primary separation box. The separating screw blade extends into the primary separation box from one side of the separating shell, and the side of the separating screw blade facing away from the separating outer shell is rotatably connected to the separating outer shell. The cross-section of the arc-shaped filter screen is semi-circular, and the axis of the arc-shaped filter screen is coaxial with the separating screw blade.

[0007] Preferably, the first separation pipe is vertically installed at the lower part of the separation screw conveyor, and the second separation pipe is vertically installed at the upper part of the oil removal screw conveyor. A secondary separation box is installed at the lower part of the first separation pipe, and the second separation pipe is installed at the lower part of the secondary separation box. A filter plate is provided in the secondary dust removal box, and the filter plate is inclined downward toward the second separation pipe.

[0008] Preferably, the discharge body is open to the pyrolysis furnace body on one side and is coaxially arranged with the pyrolysis furnace body. The end of the pyrolysis furnace body facing the discharge body is fitted with a discharge body bearing, which is inserted into the discharge body. The discharge body has a discharge body flange inside, which is located inside the discharge body bearing. The inner diameter of the discharge body flange is the same as the inner diameter of the pyrolysis furnace body. A discharge body sealing ring is installed on the discharge body flange, and the discharge body sealing ring is in sealing rotational contact with the end of the pyrolysis furnace body.

[0009] Preferably, the pyrolysis furnace body has a feeding section on the side facing the feeding conveyor. One end of the feeding section is a furnace body connecting section, and the other end is a conveying connecting section. The furnace body connecting section is coaxially and fixedly connected to the pyrolysis furnace body. The inner diameter of the conveying connecting section is smaller than the inner diameter of the furnace body connecting section. The conveying connecting section and the furnace body connecting section are connected by a frustum-shaped cylindrical structure. The feeding screw conveyor includes a feeding outer shell and feeding screw blades. A feeding bearing is sleeved on the outer side of the feeding outer shell facing the feeding section. The feeding bearing is inserted into the conveying connecting section.

[0010] Preferably, the heating device includes a combustion chamber, through which the pyrolysis furnace body passes, and multiple burners are provided inside the combustion chamber.

[0011] Preferably, a gear ring is coaxially fixed on the feeding section, the gear ring is connected to a drive gear, a rotating motor is installed on the frame, the rotating motor is connected to a drive reducer, the output shaft of the drive reducer is coaxially fixedly connected to the drive gear, and the lower part of the pyrolysis furnace body is provided with two support devices located on both sides of the heating device. The support device includes a support frame installed on the frame, and two support wheels are rotatably installed on the support frame. The support furnace body is located between the two rotating wheels and the support wheels.

[0012] A method for treating coal tar residue pyrolysis, characterized by the following steps: S1, simultaneously adding decoking balls and shavings of waste rubber into the feed box; S2, under the conveying action of the feed screw conveyor, the waste rubber and decoking balls enter the pyrolysis furnace body from one end; S3, the pyrolysis furnace body rotates slowly, and the waste rubber and decoking balls move from the feed end to the discharge body under the action of the shaftless screw blades inside the pyrolysis furnace body, rotating together with the pyrolysis furnace body. During the rotation, the rubber fragments are fully pyrolyzed, and the decoking balls rub against the inner wall of the furnace body, carrying away the oil residue on the inner wall of the pyrolysis furnace body; S4, the furnace ash and decoking balls produced by pyrolysis enter the discharge body from the pyrolysis furnace body, and then enter the discharge body from the discharge body... In the primary separation box, the furnace ash is filtered through an arc-shaped filter screen and falls downwards through the filter holes. It is then conveyed to the ash collection box by an ash conveying screw conveyor. The decoking balls are conveyed to the secondary separation box by a separation screw conveyor. In the secondary separation box, the pyrolysis furnace ash adhering to the decoking balls undergoes secondary separation through a filter plate. The furnace ash is discharged through the ash outlet. In the secondary separation box, the decoking balls enter the deoiling screw conveyor and are washed with high-temperature washing water sprayed from the spray nozzles in the washing section, and dried with high-temperature air sprayed from the gas nozzles in the drying section. In the drying box, the dried decoking balls enter the collection box and are conveyed to the feed box by a bucket elevator, realizing the recycling of the decoking balls.

[0013] The beneficial effects of this invention are as follows: It effectively solves the problem of slag buildup on the inner wall of the pyrolysis furnace: By installing deslag removal balls inside the pyrolysis furnace and utilizing the friction between the balls and the inner wall during furnace rotation, the oil slag adhering to the furnace wall is promptly removed, keeping the inner wall clean and effectively maintaining the furnace's effective volume and heat transfer efficiency. This avoids localized overheating, extends equipment lifespan, and improves pyrolysis efficiency and oil / gas quality. It achieves efficient recycling of the deslag removal balls: After separation, cleaning, and drying, the deslag removal balls are re-transported to the feed box via a bucket elevator for reuse, forming a complete closed-loop circulation system. This eliminates the need for frequent replenishment of new balls, reducing operating costs. It provides excellent separation of furnace ash from the deslag removal balls: The two-stage separation structure, consisting of an arc-shaped filter screen in the primary separation box and a filter plate in the secondary separation box, effectively separates furnace ash from the deslag removal balls, reducing the loss of solid media. The decoking screw conveyor is equipped with a cleaning section and a drying section at intervals. The decoking balls are treated by high-temperature washing water spray cleaning and high-temperature air drying, respectively. The cleaning and drying process is continuous, which can thoroughly remove the oil residue and dust adhering to the surface of the decoking balls, ensuring the cleanliness and oil removal efficiency of the decoking balls when they are put back into circulation. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the overall three-dimensional structure of the present invention.

[0015] Figure 2 This is a schematic diagram of the frameless structure of the present invention.

[0016] Figure 3 For the present invention Figure 1 A diagram showing the view from the right.

[0017] Figure 4 For the present invention Figure 1 A three-dimensional schematic diagram.

[0018] Figure 5 This is a schematic diagram of the pyrolysis furnace body connection of the present invention.

[0019] Figure 6 For the present invention Figure 5 A diagram showing the view from the right.

[0020] Figure 7 For the present invention Figure 5 A schematic diagram along the AA direction.

[0021] Figure 8 This is a schematic diagram of the connection of the separating screw conveyor of the present invention.

[0022] Figure 9 For the present invention Figure 8 A diagram showing the view from below.

[0023] Figure 10 For the present invention Figure 8 Left-view diagram.

[0024] Reference numerals: 1. Frame; 2. Cracking furnace body; 201. Conveying connection section; 202. Furnace body connection section; 203. Shaftless spiral blades; 3. Heating device; 4. Feed screw conveyor; 6. Discharge body; 601. Discharge body flange; 7. Feed box; 8. Primary separation box; 9. Separation screw conveyor; 901. Separation screw blades; 902. Separation outer shell; 10. Arc-shaped filter screen; 11. First separation pipe; 12. Oil removal screw conveyor; 1201. Oil removal outer shell. 1202. Cleaning hole; 13. Secondary separation pipe; 14. Spray box; 15. Drying box; 16. Collection box; 17. Bucket elevator; 18. Ash conveying screw conveyor; 19. Ash discharge pipe; 20. Ash collection box; 21. Secondary separation box; 22. Filter plate; 23. Discharge body bearing; 24. Feed bearing; 25. Gear ring; 26. Drive gear; 27. Rotary motor; 28. Drive reducer; 29. ​​Support device; 2901. Support frame; 2902. Support wheel. Detailed Implementation

[0025] The specific embodiments of the present invention will be further described in detail below with reference to the accompanying drawings.

[0026] Depend on Figures 1 to 10A coal tar residue pyrolysis treatment system is provided, comprising a frame 1, a rotatable pyrolysis furnace body 2 rotatably mounted on the frame 1, shaftless spiral blades 203 fixedly installed on the inner wall of the pyrolysis furnace body 2, and a heating device 3 provided on the outer side of the middle part of the pyrolysis furnace body 2. The system is characterized by having a coke removal ball inside the pyrolysis furnace body, a feeding screw conveyor 4 connected to one end of the pyrolysis furnace body 2, the feeding screw conveyor 4 being rotatably connected to the pyrolysis furnace body 2, and a discharge body 6 connected to the other end of the pyrolysis furnace body 2, the discharge body 6 being rotatably connected to the pyrolysis furnace body 2, a feeding box 7 connected to the upper part of the feeding screw conveyor 4, a primary separation box 8 connected to the lower end of the discharge body 6, and an oil separator at the upper end of the discharge body 6. An air outlet is provided. A separating screw conveyor 9 is located on one side of the primary separation chamber 8. The separating screw conveyor 9 includes separating screw blades 901 that extend into the primary separation chamber 8. Below the separating screw blades 901 is an arc-shaped filter screen 10 installed inside the primary separation chamber 8. A first separating pipe 11 is located at the end of the separating screw conveyor 9 facing away from the separation chamber. An oil-removing screw conveyor 12 is located below one side of the separating screw conveyor 9. A second separating pipe 13 is connected to the upper part of the oil-removing screw conveyor 12 near the first separating pipe 11. The first separating pipe 11 and the second separating pipe 13 are connected. The oil-removing screw conveyor 12 includes an oil-removing outer casing 1201 disposed outside it. The degreasing housing 1201 is provided with a cleaning section and a drying section at intervals. Both the cleaning section and the drying section are provided with cleaning holes 1202 at the bottom. The cleaning section is provided with a spray box 14, which is provided with multiple spray nozzles. The drying section is provided with a drying box 15, which is provided with multiple gas nozzles. The opposite end of the degreasing screw conveyor 12 is connected to a collection box 16. A bucket elevator 17 is provided on one side of the collection box 16 to transport the decoking balls to the feed box 7.

[0027] The oil removal screw conveyor 12 mainly consists of a cylindrical oil removal outer shell 1201, oil removal screw blades installed inside the oil removal outer shell 1201, and a drive motor connected to the oil removal screw blades. That is, the oil removal screw conveyor 12 is a horizontally placed auger capable of conveying granular or powdery materials. The feeding screw conveyor 4 and the separating screw conveyor 9 have similar main structures. One end of the pyrolysis furnace body 2 is connected to the discharge conveyor, and the other end is connected to the discharge body 6, the primary separation box 8, and the separating screw conveyor 9. This effectively prevents air from entering the pyrolysis furnace body 2, ensuring that the rubber debris inside the pyrolysis furnace body 2 is pyrolyzed into oil and gas components in an oxygen-free environment. The oil and gas outlet at the top of the discharge body 6 is connected to an oil and gas channel, through which the pyrolyzed oil and gas enters the subsequent processing steps.

[0028] The oil removal screw conveyor 12 includes an outer casing and oil removal screw blades installed inside the casing. The bottom of the outer casing has two openings. One opening houses a cleaning plate with cleaning holes 1202, and the other opening houses a drying plate with drying holes. Coke removal balls and waste rubber fragments are simultaneously added to the feed box 7. The waste rubber and coke removal balls enter the feed screw conveyor 4 downwards. Under the action of the feed screw conveyor 4, they enter the pyrolysis furnace 2 from one end. Then, high-temperature anaerobic pyrolysis occurs inside the pyrolysis furnace. The pyrolysis furnace 2 rotates slowly. Under the action of the shaftless screw blades 203 inside the pyrolysis furnace 2, the waste rubber and coke removal balls move from the feed end towards the discharge body 6 and rotate together with the pyrolysis furnace 2. During rotation, the rubber fragments are fully pyrolyzed, and the coke removal balls rub against the inner wall of the furnace, carrying away the oil residue on the inner wall of the pyrolysis furnace 2. Then, the furnace ash and decoking balls enter the discharge body 6, and then enter the primary separation box 8 from the discharge body 6. The furnace ash is separated and enters the ash collection box 20. The decoking balls enter the secondary separation box 21 through the separation screw conveyor 9. Then, the remaining furnace ash and decoking balls are separated again through the secondary separation box 21. The decoking balls then enter the deoiling screw conveyor 12. In the deoiling screw conveyor 12, they are washed with high-temperature washing water and dried with high-temperature air, and then enter the collection box 16. The decoking balls in the collection box 16 are then conveyed into the feed box 7 through the bucket elevator 17.

[0029] The primary separation box 8 is equipped with a screw conveyor 18 for conveying ash at the bottom. The primary separation box 8 is connected to an ash discharge pipe 19 at the bottom. The ash discharge pipe 19 is connected to the upper part of one side of the screw conveyor 18 located at the bottom. The end of the screw conveyor 18 away from the ash discharge pipe 19 is equipped with an ash collection box 20. The screw conveyor 18 is connected to the ash collection box 20 through the ash discharge pipe.

[0030] The separating screw conveyor 9 includes a separating housing 902, which is fixedly installed on one side of the primary separation box 8. Separating screw blades 901 extend from one side of the separating housing into the primary separation box 8. The side of the separating screw blades 901 facing away from the separating housing 902 is rotatably connected to the separating housing 902. The arc-shaped filter screen 10 has a semi-circular cross-section, and its axis is coaxial with the separating screw blades 901. The lower end of the discharge body 6 is connected to a mixing discharge pipe, and the upper part of the primary separation box 8 is connected to the upper part of the mixing discharge pipe. The decoking balls and pyrolysis ash output from the end of the pyrolysis furnace body 2 enter the discharge body 6, and then from the discharge body 6, they enter the primary separation box 8 through the mixing discharge pipe. Then, they are conveyed to the first separation pipe 11 by the separation spiral blades 901. During the conveying of the decoking balls and pyrolysis ash to the first separation pipe 11, the decoking balls continue to be conveyed, and then the pyrolysis ash falls down from the filter holes on the arc filter. Then, it enters the ash conveying screw conveyor 18 from the ash discharge pipe 19, and then is fed into the ash collection box 20 by the ash conveying screw conveyor 18.

[0031] The first separation pipe 11 is vertically installed at the lower part of the separating screw conveyor 9, and the second separation pipe 13 is vertically installed at the upper part of the oil removal screw conveyor 12. A secondary separation box 21 is installed at the lower part of the first separation pipe 11, and the second separation pipe 13 is installed at the lower part of the secondary separation box 21. A filter plate 22 is provided inside the secondary dust removal box, and the filter plate 22 is inclined downward toward the second separation pipe 13. A dust removal inlet is provided at the upper part of the secondary separation box 21, and a dust removal outlet is provided at the lower part of the secondary separation box 21. The dust removal inlet and dust removal outlet are located on both sides of the secondary separation box 21. The first separation pipe 11 enters the secondary separation box 21 through the dust removal inlet, and the second separation pipe 13 enters the secondary separation box 21 upward through the dust removal outlet. The filter plate 22 is fixedly installed inside the secondary separation box 21. The filter plate 22 is located on one side of the dust removal outlet. The coke removal ball enters the secondary separation box 21 from the first separation pipe 11, and then falls onto the filter plate 22. It slides down the filter plate 22 and enters the second separation pipe 13. During the process of the coke removal ball falling onto and sliding off the filter plate 22, the pyrolysis furnace ash adhering to the coke removal ball will fall off through the filter holes on the filter plate 22, realizing the secondary separation of pyrolysis furnace ash and coke removal ball. The secondary separation box 21 is provided with an ash outlet, which is located on one side of the secondary separation box 21 and on the side of the filter plate 22 away from the first separation pipe 11.

[0032] The discharge body 6 is open to the pyrolysis furnace body 2 on one side and is coaxially arranged with the pyrolysis furnace body 2. A discharge body bearing 23 is fitted onto the end of the pyrolysis furnace body 2 facing the discharge body 6, and the discharge body bearing 23 is inserted into the discharge body 6. An discharge body flange 601 is provided inside the discharge body 6, located inside the discharge body bearing 23. The inner diameter of the discharge body flange 601 is the same as the inner diameter of the pyrolysis furnace body 2. A sealing ring for the discharge body 6 is installed on the discharge body flange 601, and the sealing ring makes sealing rotational contact with the end of the pyrolysis furnace body 2. The sealing ring prevents oxygen from entering the pyrolysis furnace body 2 from the outside. The bearing supports the pyrolysis furnace body 2 and allows it to rotate.

[0033] The pyrolysis furnace body 2 has a feeding section on the side facing the feeding conveyor. One end of the feeding section is the furnace body connecting section 202, and the other end is the conveying connecting section 201. The furnace body connecting section is coaxially and fixedly connected to the pyrolysis furnace body 2. The inner diameter of the conveying connecting section 201 is smaller than the inner diameter of the furnace body connecting section 202. The conveying connecting section 201 and the furnace body connecting section 202 are connected by a frustum-shaped cylindrical structure. The feeding screw conveyor 4 includes a feeding outer shell and feeding screw blades. A feeding bearing 24 is sleeved on the outside of the end of the feeding outer shell facing the feeding section. The feeding bearing 24 is inserted into the conveying connecting section 201. The feed bearing 24 is fitted onto the feed housing and fixedly connected. The feed bearing 24 is inserted into the conveying connection section 201 and fixedly connected. The end of the feed housing that extends into the pyrolysis furnace body 2 is provided with a feed flange. The feed flange is located on the side of the feed bearing 24 facing the pyrolysis furnace body 2. A feed sealing ring is installed on the feed flange. The feed sealing ring is sealed and rotatably connected to the inner wall of the furnace body connection section 202. The feed spiral blades extend out of the housing and enter the conveying connection section 201. The feed spiral conveyor 4 conveys the waste to be pyrolyzed from the feed box 7 into the pyrolysis furnace body 2.

[0034] The heating device 3 includes a combustion chamber through which the pyrolysis furnace body 2 passes. Multiple burners are installed within the combustion chamber. Each burner is connected to a gas supply pipe, and combustion from the burners heats the pyrolysis furnace body 2.

[0035] A gear ring 25 is coaxially fixedly fitted on the feeding section, and the gear ring 25 is connected to a drive gear 26. A rotary motor 27 is mounted on the frame 1, and the rotary motor 27 is connected to a drive reducer 28. The output shaft of the drive reducer 28 is coaxially fixedly connected to the drive gear 26. The lower part of the pyrolysis furnace body 2 is provided with two support devices 29 located on both sides of the heating device 3. The support device 29 includes a support frame 2901 mounted on the frame 1, and two support wheels 2902 are rotatably mounted on the support frame 2901. The support furnace body is positioned between the two wheels 2902. The axis of the support wheel 2902 is parallel to the axis of the pyrolysis furnace body 2, and the support wheel 2902 rolls in contact with the pyrolysis furnace body 2, thereby supporting the pyrolysis furnace body 2. On the furnace body, the main shaft of the drive motor is coaxially and fixedly connected to the input shaft of the drive reducer 28. The drive motor drives the gear ring 25 to rotate through the drive gear 26, thereby driving the material feeding section and the pyrolysis furnace body 2 to rotate. The support device 29 is located outside the combustion chamber.

[0036] A method for treating coal tar residue pyrolysis, characterized by the following steps: S1, simultaneously adding decoking balls and waste rubber fragments into the feed box 7; S2, under the conveying action of the feed screw conveyor 4, the waste rubber and decoking balls enter the pyrolysis furnace body 2 from one end; S3, the pyrolysis furnace body 2 rotates slowly, and the waste rubber and decoking balls move from the feed end to the discharge body 6 under the action of the shaftless spiral blades 203 inside the pyrolysis furnace body 2, and rotate together with the pyrolysis furnace body 2. During the rotation, the rubber fragments are fully pyrolyzed, and the decoking balls rub against the inner wall of the furnace body, carrying away the oil residue on the inner wall of the pyrolysis furnace body 2; S4, the furnace ash and decoking balls produced by pyrolysis enter the discharge body 6 from the pyrolysis furnace body 2, and then enter the primary separation unit from the discharge body 6. In box 8, furnace ash is filtered by arc-shaped filter screen 10 and falls downward through the filter holes. It is then conveyed to ash collection box 20 by ash conveying screw conveyor 18. The decoking balls are conveyed to secondary separation box 21 by separation screw conveyor 9. In S5, the pyrolysis furnace ash adhering to the decoking balls is separated for the second time by filter plate 22 in secondary separation box 21. The furnace ash is discharged through ash outlet hole. In S6, the decoking balls after secondary separation enter deoiling screw conveyor 12. They are washed by high-temperature washing water sprayed from spray nozzles in the washing section and dried by high-temperature air sprayed from gas nozzles in the drying section. In S7, the dried decoking balls enter collection box 16. The decoking balls in collection box 16 are conveyed to feed box 7 by bucket elevator 17 to realize the recycling of decoking balls.

[0037] The beneficial effects of this invention are as follows: It effectively solves the problem of slag buildup on the inner wall of the furnace: By installing deslag removal balls inside the pyrolysis furnace body 2, and utilizing the friction between the deslag removal balls and the inner wall of the furnace body during rotation, the oil slag adhering to the furnace wall is promptly removed, keeping the inner wall of the furnace clean at all times. This effectively maintains the effective volume and heat transfer efficiency of the furnace body, avoids localized overheating, extends the service life of the equipment, and improves pyrolysis efficiency and oil and gas quality. It achieves efficient recycling of the deslag removal balls: After separation, cleaning, and drying, the deslag removal balls are re-transported to the feed box 7 via a bucket elevator 17 for recycling, forming a complete closed-loop circulation system. This eliminates the need for frequent replenishment of new deslag removal balls, reducing operating costs. It provides excellent separation of furnace ash from the deslag removal balls: The two-stage separation structure, consisting of the arc-shaped filter screen 10 in the primary separation box 8 and the filter plate 22 in the secondary separation box 21, effectively separates the furnace ash from the deslag removal balls, reducing the loss of solid media. The decoking screw conveyor 12 is equipped with a cleaning section and a drying section at intervals. The decoking balls are treated by high-temperature washing water spray cleaning and high-temperature air drying, respectively. The cleaning and drying process is continuous, which can thoroughly remove the oil residue and dust adhering to the surface of the decoking balls and ensure the cleanliness and oil removal efficiency of the decoking balls when they are put back into circulation.

[0038] The embodiments described above are not intended to limit the scope of the present invention. Any modifications and improvements made by those skilled in the art to the technical solutions of the present invention without departing from the inventive concept should be included within the scope of protection defined by the claims of the present invention.

Claims

1. A coal tar residue pyrolysis treatment system, comprising a frame (1), a rotatable pyrolysis furnace body (2), with shaftless helical blades (203) fixedly arranged on the inner wall of the pyrolysis furnace body (2), and a heating device (3) provided on the outer side of the middle part of the pyrolysis furnace body (2), characterized in that, The pyrolysis furnace body is equipped with a decoking ball. One end of the pyrolysis furnace body (2) is connected to a feeding screw conveyor (4), which is rotatably connected to the pyrolysis furnace body (2). The other end of the pyrolysis furnace body (2) is connected to a discharge body (6), which is rotatably connected to the pyrolysis furnace body (2). The upper part of the feeding screw conveyor (4) is connected to a feeding box (7). The lower end of the discharge body (6) is connected to a primary separation box (8). The upper end of the discharge body (6) is provided with an oil and gas outlet. A separation screw conveyor (9) is provided on one side of the primary separation box (8). The separation screw conveyor (9) includes a separation screw blade (901), which extends into the primary separation box (8). Below the separation screw blade (901) is an arc-shaped filter screen (10) installed inside the primary separation box (8). The end of the separation screw conveyor (9) away from the separation box is provided with a first separator. Below the first separation pipe (11), an oil removal screw conveyor (12) is provided on one side of the separation screw conveyor (9). The upper part of the oil removal screw conveyor (12) near the first separation pipe (11) is connected to the second separation pipe (13). The first separation pipe (11) and the second separation pipe (13) are connected. The oil removal screw conveyor (12) includes an oil removal shell (1201) set outside it. The oil removal shell (1201) is provided with a cleaning section and a drying section at intervals. The cleaning section and the drying section are provided with cleaning holes (1202) at the bottom. The cleaning section is provided with a spray box (14). The spray box (14) is provided with multiple spray nozzles. The drying section is provided with a drying box (15). The drying box (15) is provided with multiple gas nozzles. The oil removal screw conveyor (12) is connected to a collection box (16) at one end away. A bucket elevator (17) is provided on one side of the collection box (16) to transport the decoking balls to the feed box (7).

2. The coal tar residue pyrolysis treatment system according to claim 1, characterized in that, The primary separation box (8) is equipped with a screw conveyor (18) for conveying ash at the bottom. The primary separation box (8) is connected to an ash discharge pipe (19) at the bottom. The ash discharge pipe (19) is connected to the upper part of one side of the screw conveyor (18) located below it. The end of the screw conveyor (18) away from the ash discharge pipe (19) is equipped with an ash collection box (20). The screw conveyor (18) is connected to the ash collection box (20) through the ash discharge pipe.

3. The coal tar residue pyrolysis treatment system according to claim 1 or 2, characterized in that, The separating screw conveyor (9) includes a separating housing (902), which is fixedly installed on one side of the primary separation box (8). The separating screw blade (901) extends into the primary separation box (8) from one side of the separating housing. The side of the separating screw blade (901) away from the separating housing (902) is rotatably connected to the separating housing (902). The cross-section of the arc-shaped filter screen (10) is semi-circular, and the axis of the arc-shaped filter screen (10) is coaxial with the separating screw blade (901).

4. The coal tar residue pyrolysis treatment system according to claim 2, characterized in that, The first separation pipe (11) is vertically installed at the lower part of the separation screw conveyor (9), and the second separation pipe (13) is vertically installed at the upper part of the oil removal screw conveyor (12). A secondary separation box (21) is installed at the lower part of the first separation pipe (11), and the second separation pipe (13) is installed at the lower part of the secondary separation box (21). A filter plate (22) is provided in the secondary dust removal box, and the filter plate (22) is inclined downward toward the second separation pipe (13).

5. The coal tar residue pyrolysis treatment system according to claim 1, characterized in that, The discharge body (6) is open to the pyrolysis furnace body (2) on one side and is coaxially arranged with the pyrolysis furnace body (2). The end of the pyrolysis furnace body (2) facing the discharge body (6) is fitted with a discharge body bearing (23). The discharge body bearing (23) is inserted into the discharge body (6). The discharge body (6) is provided with a discharge body flange (601) inside. The discharge body flange (601) is located inside the discharge body bearing (23). The inner diameter of the discharge body flange (601) is the same as the inner diameter of the pyrolysis furnace body (2). A discharge body (6) sealing ring is installed on the discharge body flange (601). The discharge body (6) sealing ring is in sealed rotational contact with the end of the pyrolysis furnace body (2).

6. The coal tar residue pyrolysis treatment system according to claim 1, characterized in that, The pyrolysis furnace body (2) has a feeding section on the side facing the feeding conveyor. One end of the feeding section is the furnace body connecting section (202), and the other end is the conveying connecting section (201). The furnace body connecting section is coaxially and fixedly connected to the pyrolysis furnace body (2). The inner diameter of the conveying connecting section (201) is smaller than the inner diameter of the furnace body connecting section (202). The conveying connecting section (201) and the furnace body connecting section (202) are connected by a frustum cylindrical structure. The feeding screw conveyor (4) includes a feeding outer shell and feeding screw blades. The feeding outer shell is fitted with a feeding bearing (24) on the outside of the end facing the feeding section. The feeding bearing (24) is inserted into the conveying connecting section (201).

7. The coal tar residue pyrolysis treatment system according to claim 1, characterized in that, The heating device (3) includes a combustion chamber, and the pyrolysis furnace body (2) passes through the combustion chamber, which is equipped with multiple burners.

8. The coal tar residue pyrolysis treatment system according to claim 1, characterized in that, A gear ring (25) is coaxially fixed on the feeding section. The gear ring (25) is connected to a drive gear (26). A rotating motor (27) is installed on the frame (1). The rotating motor (27) is connected to a drive reducer (28). The output shaft of the drive reducer (28) is coaxially fixedly connected to the drive gear (26). The lower part of the pyrolysis furnace body (2) is provided with two support devices (29) located on both sides of the heating device (3). The support device (29) includes a support frame (2901) installed on the frame (1). Two support wheels (2902) are rotatably installed on the support frame (2901). The support furnace body is located between the two wheels and the support wheels (2902).

9. A method for treating coal tar residue by pyrolysis, characterized in that, Includes the following steps: S1. Simultaneously add descaling balls and waste rubber fragments into the feed box (7); S2. Under the conveying action of the feed screw conveyor (4), the waste rubber and descaling balls enter the pyrolysis furnace body (2) from one end; S3. The pyrolysis furnace body (2) rotates slowly, and the waste rubber and descaling balls move from the feed end to the discharge body (6) under the action of the shaftless spiral blades (203) in the pyrolysis furnace body (2), and rotate together with the pyrolysis furnace body (2). During the rotation, the rubber fragments are fully pyrolyzed, and the descaling balls rub against the inner wall of the furnace body, carrying away the oil residue on the inner wall of the pyrolysis furnace body (2); S4. The furnace ash and descaling balls produced by pyrolysis enter the discharge body (6) from the pyrolysis furnace body (2), and then enter the primary separation box (8) from the discharge body (6). The furnace ash passes through the arc-shaped filter screen (1) S0) After filtration, the ash falls downward from the filter hole and is conveyed to the ash collection box (20) by the ash conveying screw conveyor (18). The ash removal ball is conveyed to the secondary separation box (21) by the separation screw conveyor (9). S5) The pyrolysis furnace ash adhering to the ash removal ball is separated for the second time by the filter plate (22) in the secondary separation box (21). The furnace ash is discharged through the ash outlet hole. S6) The ash removal ball after the second separation enters the oil removal screw conveyor (12). It is washed by the high temperature washing water sprayed by the spray nozzle in the washing section and dried by the high temperature air sprayed by the gas nozzle in the drying section. S7) The dried ash removal ball enters the collection box (16). The ash removal ball in the collection box (16) is conveyed to the feed box (7) by the bucket elevator (17) to realize the recycling of the ash removal ball.

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