A method for pre-treating fine distillation residue and a fine distillation residue forming system

Abstract

The present invention relates to a method for pretreating fine distillation residue and a fine distillation residue forming system. The method for pretreating fine distillation residue includes the following steps: heating the solid fine distillation residue to make the solid fine distillation residue become a high-viscosity liquid fine distillation residue; performing primary mixing of the liquid fine distillation residue and an anti-sticking agent while heating; performing secondary mixing of the mixture of the fine distillation residue and the anti-sticking agent; performing tertiary mixing of the mixture after the secondary mixing while crushing, and at the same time, performing preliminary cooling and extruding the mixture after the tertiary mixing into a rod-shaped material; rapidly cooling the rod-shaped material and maintaining the rod-shaped material at a low temperature until it is fed into an incineration furnace. This pretreatment method and forming system realize the automation of the fine distillation residue forming process and can continuously and stably pretreat the fine distillation residue.

Description

Technical Field

[0001] The present invention relates to the field of equipment and methods for treating fine distillation residues, and particularly to a pretreatment method for fine distillation residues and a fine distillation residue forming system. Background Art

[0002] Fine distillation residues are waste tar-like residues generated from refining, distillation, and any pyrolysis processes, including tar residues generated during gas production, tar residues generated during crude oil distillation, asphalt-like tar and acid tar generated during crude oil refining, distillation residues and bottoms generated during chemical production, tar-like residues generated during the pyrolysis process of chemical raw material production, soil contaminated by tar or distillation residues generated during industrial production processes, packages and containers that have contained tar-like residues, etc.

[0003] With the rapid development of industry, the amount of hazardous substances generated during industrial production is increasing day by day. In the coking process, the ratio of fine distillation residues to coke produced is about 0.3%. In 2012, the national coke output reached 450 million tons, and the fine distillation residues reached 1.35 million tons. This residue belongs to hazardous waste of HW11 category and is called "black adhesive" in the disposal field, which is one of the most difficult hazardous wastes to dispose of.

[0004] The state of fine distillation residues at normal temperature has three forms: liquid, semi-solid, and solid, and the solid fine distillation residues account for a small part. Its physical form changes with the ambient temperature. Those that do not solidify with the ambient temperature during the preliminary treatment of such hazardous wastes can be safely disposed of in a cement kiln after being blended and stirred and then evenly sent using existing equipment. When liquid and semi-solid fine distillation residues are incinerated, their good fluidity facilitates their entry into an incinerator or incineration kiln for incineration. However, for a large amount of fine distillation residues in a solid state at normal temperature, existing equipment simply cannot dispose of them. The solid fine distillation residues are extremely sticky and cannot be separated from the packaging, resulting in a large amount of fine distillation residues that cannot be disposed of and causing a large inventory. The flammable and toxic characteristics of fine distillation residues pose potential high safety risks and environmental risks.

[0005] Solid refined distillation residue. One common treatment method is manual crushing, that is, breaking open the packaging to reduce the volume of the refined distillation residue, and then manually feeding it into the incineration system for incineration. This treatment method has low work efficiency, great potential safety hazards, and unstable feeding and incineration. Another common treatment method is to use a crusher for crushing. Specifically, reference can be made to the structure and treatment method of the crusher disclosed in the Chinese invention patent application with the application publication number CN113649145A and the name "A Strong Viscosity Rectification Residue Crushing and Granulating Device and Process". The solid refined distillation residue together with the packaging (ton bag / barrel) is not separated and is directly fed into the crusher for crushing, so as to change the solid refined distillation residue from large-particle-size materials into small-particle-size materials. Only those with particle sizes meeting the requirements of the kiln inlet size can be fed for incineration or harmless treatment. Due to the nature of the solid refined distillation residue, many of them are flammable and explosive chemicals. Therefore, during the crushing process, a nitrogen protection system is required to ensure that these chemicals will not be detonated by the sparks generated during crushing. Nitrogen protection is achieved by forcibly discharging the air in the closed crushing space and filling the space with nitrogen to reduce the oxygen content in the gas in the space, so as to ensure that the combustible gas will not explode at a low content. This system has low production capacity, high energy consumption, and large nitrogen consumption. Because the refined distillation residue becomes solid after cooling, the crusher is prone to blockage, and the system occupies a large area. Summary of the Invention

[0006] In order to solve the above problems, the purpose of the present invention is to provide a pretreatment method for refined distillation residue and a refined distillation residue forming system. The pretreatment method and the forming system realize the automation of the refined distillation residue forming process and can continuously and stably preprocess the refined distillation residue.

[0007] To achieve the above purpose, the present invention adopts the following technical solutions:

[0008] A pretreatment method for refined distillation residue, which is carried out before the refined distillation residue is fed into the incineration kiln, and includes the following steps:

[0009] S1. Heat the solid refined distillation residue to make it into a liquid refined distillation residue;

[0010] S2. Mix the liquid refined distillation residue with an anti-sticking agent while heating. The anti-sticking agent is composed of small particles with a particle size ≤ 5 mm and materials that do not chemically react with the refined distillation residue;

[0011] S3. Perform secondary mixing on the primary mixed material of the refined distillation residue and the anti-sticking agent;

[0012] S4. While crushing the secondary mixed material, perform tertiary mixing, and at the same time, perform preliminary cooling and extrude the tertiary mixed material into a rod-shaped material;

[0013] S5. Rapidly cool the rod-shaped material and keep it at a low temperature until it is fed into the incineration furnace.

[0014] A fine distillation residue forming system, comprising:

[0015] A mixer for initially mixing and conveying the liquid fine distillation residue and the anti-sticking agent while heating;

[0016] A double-shaft screw conveyor located below the mixer for secondarily mixing and conveying the initially mixed material of the fine distillation residue and the anti-sticking agent;

[0017] A fine distillation residue forming machine communicated with the discharge port of the double-shaft screw conveyor. Inside the forming cylinder of the fine distillation residue forming machine, a main shaft is horizontally arranged. The main shaft uses a screw rod with variable diameter and variable pitch. The head section of the screw rod is in a conical shape with a gradually decreasing diameter from the head end to the tail end, and the diameter of the tail section of the screw rod is the same. The pitch of the screw rod gradually decreases from the head end to the tail end. Inside the cylinder body of the forming cylinder, a circulating water pipe is arranged, and circulating cooling water passes through the circulating water pipe. A plurality of reamers are arranged on the cylinder body of the forming cylinder, and each reamer is threadedly connected to the cylinder body of the forming cylinder. A relief groove for cooperating with the reamer is provided on the spiral blade of the screw rod, and the reamer extends into the relief groove of the spiral blade of the screw rod. The main shaft is driven to rotate by a main shaft drive motor with a speed reducer. An outlet through hole is provided at the tail end of the forming cylinder. The fine distillation residue forming machine crushes the secondarily mixed material while performing a third mixing, preliminary cooling, and extruding the third mixed material into a rod-shaped material through the outlet through hole;

[0018] And a quenching chamber for rapidly cooling the rod-shaped material communicated with the discharge port of the fine distillation residue forming machine.

[0019] Further, the mixing cylinder of the mixer is of a double-layer structure. The outer wall of the mixing cylinder is a heating layer, and the inner wall of the mixing cylinder is a wear-resistant plate or a stainless steel plate. One side top of the mixing cylinder is respectively connected and communicated with a fine distillation residue feed hopper and an anti-sticking agent feed hopper. A mixing shaft is horizontally arranged inside the mixing cylinder. The mixing shaft is driven to rotate by a mixing shaft drive motor arranged outside the mixing cylinder. Stirring paddles for forward pushing and reverse pushing are arranged on the mixing shaft. An outlet is provided at the bottom of the other side of the mixing cylinder.

[0020] Further, a number of functional interfaces are provided on the mixing cylinder.

[0021] Further, the feed port at the top of one side of the double-shaft screw conveyor is connected and communicated with the discharge port of the mixer through a pipeline, and the discharge port of the double-shaft screw conveyor is communicated with the feed port of the fine distillation residue forming machine.

[0022] Further, the tail section of the forming cylinder is of a double-layer structure, where the inner layer is made of wear-resistant plates or stainless steel plates. The circulating water pipe is attached and fixed between the double-layer structures of the forming cylinder in an S shape between the head and tail ends of the forming cylinder. A plurality of reamers are evenly arranged along the axial and radial directions of the cylinder body of the tail section of the forming cylinder.

[0023] Further, both the head end and the tail end of the forming cylinder are closed by end caps. Bearing parts are installed in the middle positions of the end caps at the head end and the tail end of the forming cylinder. Both ends of the main shaft are rotatably installed on the bearing parts at the head and tail ends. A plurality of discharge through holes are opened on the outer periphery of the end cap at the tail end around the bearing part at the tail end.

[0024] Further, the quench chamber is of an overall sealed structure. A plurality of cold air interfaces are provided on the quench chamber. A cold air outlet is provided at the connection between the quench chamber and the discharge through holes at the tail end of the refined distillation residue forming machine.

[0025] A method for pretreating refined distillation residue using the above-mentioned refined distillation residue forming system, which is carried out before the refined distillation residue is put into the incineration furnace, includes the following steps:

[0026] S1. Heat the solid refined distillation residue in the barrel to turn the solid refined distillation residue into a liquid refined distillation residue.

[0027] S2. Put the liquid refined distillation residue and the anti-sticking agent into the mixing cylinder. The heating layer on the outer wall of the mixing cylinder heats the liquid refined distillation residue to keep it in a liquid state. Start the mixing shaft drive motor to drive the mixing shaft to rotate. The mixing shaft mixes the liquid refined distillation residue and the anti-sticking agent for the first time while pushing the mixed material of the refined distillation residue and the anti-sticking agent after the first mixing from the feeding hopper side to the discharge port side.

[0028] S3. The mixed material of the refined distillation residue and the anti-sticking agent after the first mixing enters the double-shaft screw conveyor through the discharge port of the mixing cylinder. The double-shaft screw conveyor mixes and conveys the mixed material of the refined distillation residue and the anti-sticking agent for the second time.

[0029] S4. The mixed material after the second mixing is conveyed by the double-shaft screw conveyor to the refined distillation residue forming machine. Under the action of the variable-diameter and variable-pitch screw and reamer of the refined distillation residue forming machine, the large-particle materials in the mixed material are crushed, fully mixed and compressed and conveyed to the discharge side. At the same time, cooling water at a temperature of 30°C to 35°C is introduced into the circulating water pipe of the forming cylinder to preliminarily cool the mixed material for the third time, so that the refined distillation residue is transformed from a liquid state to a solid state, and is fully mixed with the anti-sticking agent during the transformation process. Under the action of the main shaft, the material is compressed and extruded into rod-shaped material through the discharge through holes for discharging.

[0030] S5. Cold air below 15°C is introduced into the quenching chamber through the cold air interface. The cold air rapidly cools the rod-shaped material discharged from the refined distillation residue forming machine, and then the cold air is discharged from the cold air outlet provided at the connection between the quenching chamber and the discharge through-hole at the tail end of the refined distillation residue forming machine. The rapidly cooled rod-shaped material is stored in the quenching chamber maintained at a low temperature below 15°C until it is transported to the incineration furnace by the conveying equipment.

[0031] Further, gases such as nitrogen or carbon dioxide are introduced through the functional interface of the mixing cylinder, and the waste gas is discharged through the functional interface.

[0032] The present invention has the following beneficial effects:

[0033] Compared with manual disposal and crushing disposal, the refined distillation residue forming system and the pretreatment method can effectively solve the problem of difficult pretreatment of solid refined distillation residues. This system can automate the refined distillation residue incineration system and enable continuous and stable operation. No sparks are generated during the mixing process of the refined distillation residue and the anti-sticking agent, and the explosion risk is low. The material is crushed in a low-oxygen environment inside the forming machine, without explosion risk. Therefore, this system can achieve continuous, safe and stable operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 is the overall structural schematic diagram of the present invention;

[0035] Figure 2 is the front structural schematic diagram of the refined distillation residue forming machine;

[0036] Figure 3 is the front structural schematic diagram of the refined distillation residue forming machine;

[0037] Figure 4 is the internal structural schematic diagram of the refined distillation residue forming machine. DETAILED DESCRIPTION OF THE INVENTION

[0038] The following further describes the present invention in detail with reference to the accompanying drawings and specific embodiments:

[0039] See Figures 1 to 4 , a refined distillation residue forming system, comprising:

[0040] Feeding device, the feeding device includes a refined distillation residue feeding hopper 11 and an anti-sticking agent feeding hopper 12. The barreled solid refined distillation residue is heated by an external heating device to become a high-viscosity liquid refined distillation residue, and the preferred heating temperature is 80°C to 100°C. The refined distillation residue feeding hopper 11 receives the liquid refined distillation residue dumped by the dumping device. The anti-sticking agent feeding hopper 12 receives the anti-sticking agent conveyed by the pipeline conveying device, and the anti-sticking agent can be composed of materials such as fly ash, contaminated soil, pulverized coal or sand, etc., which are powdery or small particles with a particle size ≤ 5mm and do not chemically react with the refined distillation residue.

[0041] Mixing device 2, the mixing device 2 includes a horizontally arranged mixing cylinder 21. The mixing cylinder 21 is of a double-layer structure. The outer wall of the mixing cylinder 21 is a heating layer 211, and the inner wall of the mixing cylinder 21 is a wear-resistant plate or a stainless steel plate. One side top of the mixing cylinder 21 is respectively connected and communicated with the refined distillation residue feeding hopper 11 and the anti-sticking agent feeding hopper 12. The liquid refined distillation residue and the anti-sticking agent enter the inside of the mixing cylinder 21 through the refined distillation residue feeding hopper 11 and the anti-sticking agent feeding hopper 12 respectively. Through the heating of the outer wall heating layer 211, the refined distillation residue inside the mixing cylinder 21 is kept in a liquid state to facilitate mixing with the anti-sticking agent. A mixing shaft 22 is horizontally arranged inside the mixing cylinder 21, and the mixing shaft 22 is driven to rotate by a mixing shaft drive motor 23 arranged outside the mixing cylinder 21. Stirring paddles 24 for forward pushing and reverse pushing are arranged on the mixing shaft 22. For example, a forward pushing stirring paddle 24 at a forward 45° angle and a reverse pushing stirring paddle 24 at a reverse 45° angle can be arranged on the mixing shaft 22 to make the refined distillation residue and the anti-sticking agent mix fully. An outlet is arranged at the bottom of the other side of the mixing cylinder 21. Optionally, a number of functional interfaces are arranged on the mixing cylinder 21, such as a nitrogen inlet, a carbon dioxide fire extinguishing port or an exhaust gas discharge port.

[0042] Twin-screw conveyor 3, the twin-screw conveyor 3 is located below the mixing device 2. The feeding port at the top of one side of the twin-screw conveyor 3 is connected and communicated with the outlet of the mixing device 2 through a pipeline. The material that is basically evenly mixed by the mixing device 2 enters the twin-screw conveyor 3, and through the combined action of the two screw shafts of the twin-screw conveyor 3, the material is secondarily mixed and conveyed.

[0043] Fine distillation residue forming machine 4, the horizontally arranged forming cylinder 41 of the fine distillation residue forming machine 4 is fixed on the frame 42. An inlet port communicating with the discharge port of the double-shaft screw conveyor 3 is arranged at the top of the head section of the forming cylinder 41. The tail section of the forming cylinder 41 is of a double-layer structure, with the inner layer made of wear-resistant plates or stainless steel plates and the outer layer made of carbon steel. A main shaft 43 is horizontally arranged inside the forming cylinder 41. The main shaft 43 is a screw rod with variable diameter and variable pitch. The head section 431 of the screw rod located inside the head section of the forming cylinder 41 is in a conical shape with a diameter gradually decreasing from the head end to the tail end. The diameter of the tail section 432 of the screw rod located inside the tail section of the forming cylinder 41 is the same. The pitch of the screw rod gradually decreases from the head end to the tail end. The outer side of the spiral blade of the screw rod is arranged close to the inner wall of the forming cylinder 41. A circulating water pipe 44 is arranged between the inner lining and the outer wall of the tail section of the forming cylinder 41. The circulating water pipe 44 is attached and fixed between the inner lining and the outer wall of the forming cylinder 41 in an S shape between the head and tail ends of the forming cylinder 41. Circulating cooling water passes through the circulating water pipe 44. The purpose of the cooling water is to cool the mixed materials in a high-temperature state, enabling the liquid fine distillation residue to evolve into a solid state and combining tightly with the anti-adhesive agent during the evolution process. A plurality of reamers 45 are evenly arranged along the axial and radial directions of the forming cylinder 41 on the cylinder body of the tail section of the forming cylinder 41. Each reamer 45 is threadedly connected to the cylinder body of the forming cylinder 41, and the penetration length of the reamer 45 can be adjusted according to the material conditions. Corresponding to the positions of each reamer 45, a relief groove is opened on the spiral blade of the screw rod. Through the cutting of the reamer 45 extending into the spiral blade of the screw rod and the rotation of the continuously rotating screw rod, the crushing and mixing are made more sufficient. The head end and the tail end of the forming cylinder 41 are both closed by end caps 46. A tail-end bearing member 461 is installed at the middle position of the end cap 46 at the tail end of the forming cylinder 41. The tail end of the main shaft 43 is rotatably installed on the tail-end bearing member 461. A plurality of discharge through holes 462 are opened on the outer periphery of the tail-end bearing member 461 on the tail-end cap 46. A head-end bearing member 471 is installed at the middle position of the end cap 46 at the head end of the forming cylinder 41. The head end of the main shaft 43 is rotatably installed on the head-end bearing member 471. The extended section 433 of the main shaft 43 located outside the forming cylinder 41 is connected to the main shaft drive motor 48 with a speed reducer, and the main shaft 43 is driven to rotate by the main shaft drive motor 48. The bearing members at both the head and tail ends ensure the front and rear concentricity of the main shaft 43, reducing the vibration and eccentricity problems of the main shaft 43 during operation.

[0044] The material is in the fine distillation residue forming machine 4. Under the action of the variable-diameter and variable-pitch spiral blade of the main shaft 43 and the reamer 45, the large-particle materials in the material are further crushed to make it more fully mixed and compressed. At the same time, the circulating water pipe 44 in the forming cylinder 41 is connected to cooling water with a temperature of 30°C to 35°C to preliminarily cool the high-temperature material, causing the fine distillation residue to transform from a liquid state to a solid state. During the transformation process, it is fully mixed with the anti-sticking agent, and the material is compressed under the action of the main shaft 43 to make the material uniform and compact. Then it is extruded out through the discharge through-hole 462, and the mixed material presents a rod shape.

[0045] The rapid cooling chamber 5, the overall rapid cooling chamber 5 is a sealed structure and has a heat preservation function. A plurality of cold air interfaces are arranged on the rapid cooling chamber 5. A cold air outlet is arranged at the connection between the rapid cooling chamber 5 and the discharge through-hole 462 at the tail end of the fine distillation residue forming machine 4. Cold air is introduced into the rapid cooling chamber 5. Preferably, cold air below 15°C is used to quickly cool the material falling from the discharge through-hole 462 of the fine distillation residue forming machine 4 into the rapid cooling chamber 5, and the liquid fine distillation residue in the high-temperature fine distillation residue mixture quickly solidifies. Because the anti-sticking agent and the fine distillation residue are tightly combined, the material will not adhere after falling to the bottom of the rapid cooling chamber 5. The rapid cooling chamber 5 always maintains a low temperature. The low temperature setting is based on the solid state temperature of the treated fine distillation residue obtained in laboratory tests. The low temperature is preferably below 15°C. The material formed by the fine distillation residue and the anti-sticking agent is stored at a low temperature and quickly transported into the incineration furnace for treatment through other conveying equipment.

[0046] A method for pretreating fine distillation residue, which is carried out before the fine distillation residue is put into the incineration furnace, includes the following steps:

[0047] S1. Heat the solid fine distillation residue in a barrel to make the solid fine distillation residue become a high-viscosity liquid fine distillation residue.

[0048] S2. Mix the liquid fine distillation residue and the anti-sticking agent for the first time while heating.

[0049] The anti-sticking agent is composed of materials such as fly ash, contaminated soil, pulverized coal or sandy soil in powder form or small particles with a particle size ≤ 5mm and that do not chemically react with the fine distillation residue, and specific selection is made according to the requirements of the incineration furnace and the type of fine distillation residue.

[0050] Specifically, the liquid refined distillation residue is poured into the mixing cylinder 21 of the mixer 2 through the refined distillation residue feed hopper 11 by using a tipping device, and the anti-sticking agent is transported to the mixing cylinder 21 of the mixer 2 through the anti-sticking agent feed hopper 12 by using a pipeline conveying device; the outer wall heating layer 211 of the mixing cylinder 21 heats the liquid refined distillation residue to keep it in a liquid state; the mixing shaft drive motor 23 is started to drive the mixing shaft 22 to rotate. The mixing shaft 22 mixes the liquid refined distillation residue with the anti-sticking agent while pushing the mixed material of the refined distillation residue and the anti-sticking agent after the initial mixing from the feed hopper side to the discharge port side.

[0051] Optionally, according to the material properties of the refined distillation residue, nitrogen and / or carbon dioxide and other gases are selectively connected through the functional interface of the mixing cylinder 21, or the waste gas is discharged through the functional interface.

[0052] S3. Secondarily mix the mixed material of the refined distillation residue and the anti-sticking agent.

[0053] The mixed material of the refined distillation residue and the anti-sticking agent after the initial mixing enters the double-shaft screw conveyor 3 through the discharge port of the mixing cylinder 21 by gravity through a pipeline. The double-shaft screw conveyor 3 secondarily mixes and transports the mixed material of the refined distillation residue and the anti-sticking agent through the combined action of two screw shafts.

[0054] S4. Crush and tertiarily mix the secondarily mixed mixed material, and extrude the tertiarily mixed mixed material into a rod-shaped material while preliminarily cooling.

[0055] The secondarily mixed mixed material is transported by the double-shaft screw conveyor 3 to the refined distillation residue forming machine 4. Under the action of the variable-diameter and variable-pitch spiral blades and the reamer 45 of the refined distillation residue forming machine 4, the large-particle materials in the mixed material are crushed to make it fully mixed and compressed and transported to the discharge side. At the same time, cooling water with a temperature of 30°C to 35°C is introduced into the circulating water pipe 44 of the forming cylinder 41 to preliminarily cool the tertiarily mixed mixed material, so that the refined distillation residue is transformed from a liquid state to a solid state, and is fully mixed with the anti-sticking agent during the transformation process. Under the action of the main shaft 43, the material is compressed to make the material uniform and compact, and then is extruded through the discharge through-hole 462, and the tertiarily mixed mixed material is extruded into a rod-shaped material for discharge.

[0056] S5. Rapidly cool the rod-shaped material and maintain the temperature of the rod-shaped material as a solid rod until it is sent into the incineration furnace.

[0057] Cold air below 15°C is introduced into the quenching chamber 5 through the cold air interface. The cold air rapidly cools the rod-shaped material discharged from the refined distillation residue forming machine 4, and then the cold air is discharged from the cold air outlet provided at the connection between the quenching chamber 5 and the discharge through hole 462 at the tail end of the refined distillation residue forming machine 4. The rapidly cooled rod-shaped material is stored in the quenching chamber 5 maintained at a low temperature below 15°C until it is transported by the conveying equipment to the incineration kiln, and remains at a low temperature below 15°C during the transportation.

[0058] The above are only specific embodiments of the present invention, and do not limit the patent scope of the present invention. Any equivalent structural transformation made by using the content of the specification and drawings of the present invention, or directly or indirectly applied in other related technical fields, shall be equally included in the patent protection scope of the present invention.

Claims

1. A fine distillation residue forming system, characterized in that, comprising: A mixer (2) that heats and transports the liquid fine distillation residue and the anti-sticking agent while mixing them for the first time; A double-shaft screw conveyor (3) located below the mixer (2) that mixes and transports the first mixed material of the fine distillation residue and the anti-sticking agent for the second time; A fine distillation residue forming machine (4) connected to the discharge port of the double-shaft screw conveyor (3). Inside the forming cylinder (41) of the fine distillation residue forming machine (4), a main shaft (43) is horizontally arranged. The main shaft (43) uses a screw with variable diameter and variable pitch. The head section (431) of the screw is in a conical shape with a gradually decreasing diameter from the head end to the tail end. The diameter of the tail section (432) of the screw is the same. The pitch of the screw gradually decreases from the head end to the tail end. Inside the cylinder body of the forming cylinder (41), a circulating water pipe (44) is arranged. Circulating cooling water passes through the circulating water pipe (44). A plurality of reamers (45) are arranged on the cylinder body of the forming cylinder (41). Each reamer (45) is threadedly connected to the cylinder body of the forming cylinder (41). Relief grooves are provided on the spiral blades of the screw to cooperate with the reamers (45). The reamers (45) extend into the relief grooves of the spiral blades of the screw. The main shaft (43) is driven to rotate by a main shaft drive motor (48) with a speed reducer. An outlet through hole (462) is provided at the tail end of the forming cylinder (41). The fine distillation residue forming machine (4) crushes the second mixed material while mixing it for the third time, cools it preliminarily, and extrudes the third mixed material into a rod-shaped material through the outlet through hole (462); And a quenching chamber (5) that rapidly cools the rod-shaped material connected to the discharge port of the fine distillation residue forming machine (4).

2. The fine distillation residue forming system according to claim 1, characterized in that: The mixing cylinder (21) of the mixer (2) is of a double-layer structure. The outer wall of the mixing cylinder (21) is a heating layer (211). The inner wall of the mixing cylinder (21) is a wear-resistant plate or a stainless steel plate. One side of the top of the mixing cylinder (21) is respectively connected and communicated with the fine distillation residue feed hopper (11) and the anti-sticking agent feed hopper (12). A mixing shaft (22) is horizontally arranged inside the mixing cylinder (21). The mixing shaft (22) is driven to rotate by a mixing shaft drive motor (23) arranged outside the mixing cylinder (21). Stirring paddles (24) for forward and reverse feeding are arranged on the mixing shaft (22). An outlet is provided at the bottom of the other side of the mixing cylinder (21).

3. The fine distillation residue forming system according to claim 2, characterized in that: A number of functional interfaces are provided on the mixing cylinder (21).

4. The fine distillation residue forming system according to claim 1, characterized in that: The feed port at the top of one side of the double-shaft screw conveyor (3) is connected and communicated with the discharge port of the mixer (2) through a pipeline. The discharge port of the double-shaft screw conveyor (3) is connected and communicated with the feed port of the fine distillation residue forming machine (4).

5. The fine distillation residue forming system according to claim 1, characterized in that: The tail section of the forming cylinder (41) is of a double-layer structure, where the inner layer is made of wear-resistant plates or stainless steel plates. The circulating water pipe (44) is attached and fixed in an S shape between the double-layer structures of the forming cylinder (41) between the head and tail ends of the forming cylinder (41). A plurality of reamers (45) are uniformly arranged along the axial and radial directions of the forming cylinder (41) on the cylinder body of the tail section of the forming cylinder (41).

6. The refined distillation residue forming system according to claim 1, characterized in that: Both the head end and the tail end of the forming cylinder (41) are closed by end caps (46). Bearing parts are installed in the middle positions of the end caps (46) at the head end and the tail end of the forming cylinder (41). Both ends of the main shaft (43) are rotatably installed on the bearing parts at the head and tail ends. The end cap (46) at the tail end is provided with a plurality of discharge through holes (462) on the outer periphery of the bearing part at the tail end.

7. The refined distillation residue forming system according to claim 3, characterized in that: The quench chamber (5) is of an overall sealed structure. A plurality of cold air interfaces are provided on the quench chamber (5). A cold air outlet is provided at the connection between the quench chamber (5) and the discharge through holes (462) at the tail end of the refined distillation residue forming machine (4).

8. A method for pretreating refined distillation residue using the refined distillation residue forming system according to claim 7, which is carried out before the refined distillation residue is put into the incineration furnace, characterized in that, comprises the following steps: S1. Heat the solid refined distillation residue in barrels to make the solid refined distillation residue become liquid refined distillation residue; S2. Put the liquid refined distillation residue and the anti-sticking agent into the mixing cylinder (21). The outer wall heating layer (211) of the mixing cylinder (21) heats the liquid refined distillation residue to keep it in a liquid state. Start the mixing shaft drive motor (23) to drive the mixing shaft (22) to rotate. The mixing shaft (22) initially mixes the liquid refined distillation residue and the anti-sticking agent while pushing the mixed material of the liquid refined distillation residue and the anti-sticking agent from the feed hopper side to the discharge port side; S3. The mixed material of the liquid refined distillation residue and the anti-sticking agent after the initial mixing enters the double-shaft screw conveyor (3) through the discharge port of the mixing cylinder (21). The double-shaft screw conveyor (3) performs secondary mixing and conveying on the mixed material of the refined distillation residue and the anti-sticking agent; S4. The mixed material after the secondary mixing is conveyed by the double-shaft screw conveyor (3) into the refined distillation residue forming machine (4). Under the action of the variable-diameter and variable-pitch screw and the reamer (45) in the refined distillation residue forming machine (4), the large-particle materials in the mixed material are crushed, so that they are fully mixed and compressed and conveyed to the discharge side. At the same time, cooling water with a temperature of 30°C to 35°C is introduced into the circulating water pipe (44) of the forming cylinder (41) to preliminarily cool the mixed material for the third time, so that the refined distillation residue is transformed from a liquid state to a solid state, and is fully mixed with the anti-sticking agent during the transformation process. Under the action of the main shaft (43), the material is compressed and extruded into rod-shaped material through the discharge through holes (462) for discharging; S5. Introduce cold air below 15°C into the quenching chamber (5) through the cold air interface. The cold air rapidly cools the rod-shaped material discharged from the refined distillation residue forming machine (4), and then the cold air is discharged from the cold air outlet provided at the connection between the quenching chamber (5) and the discharge through hole (462) at the tail end of the refined distillation residue forming machine (4). The rapidly cooled rod-shaped material is stored in the quenching chamber (5) maintained at a low temperature below 15°C until it is transported to the incineration kiln by the conveying equipment.

9. The method for pretreating refined distillation residue using the refined distillation residue forming system according to claim 8, characterized in that: Nitrogen or carbon dioxide gas is introduced through the functional interface of the mixing cylinder (21), and the waste gas is discharged through the functional interface.

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