A hydrofining device and process applicable to pyrolysis tail oil

Abstract

The present invention relates to the technical field of flue cleaning, and specifically discloses a hydrofining device and process applicable to cracked tail oil. The hydrofining device includes a tank body, on which a feed inlet, a discharge outlet and a smoke exhaust pipe are provided. A cleaning device is arranged in the smoke exhaust pipe, and the cleaning device includes a filtering component, an adjusting component and a spraying component; the filtering component includes two frames and two filter meshes, the two filter meshes are respectively installed on the two frames, the side edges of the frames are slidably attached to the side walls of the smoke exhaust pipe, and the filtering component is connected with a driving member; the adjusting component is connected to both frames at the same time, and the adjusting component includes two connecting rods and two telescopic rods; the spraying component includes a liquid inlet pipe and a spraying member; the steps of the hydrofining process of cracked tail oil include pretreatment, hydrofining, separation and cooling, stabilization treatment and collection. The technical solution of the present invention ensures the smooth progress of the tail oil hydrofining operation and timely cleans the smoke exhaust pipe after the hydrogenation reaction is completed.

Description

Technical Field

[0001] The invention relates to the technical field of flue cleaning, and in particular to a hydrorefining device and process suitable for cracking tail oil. Background Art

[0002] Tail oil is the last remaining part in the petroleum refining process. It is mainly composed of hydrocarbons with a large number of carbon atoms. It usually needs further processing to obtain higher quality products. In related technologies, the tail oil is usually cracked by hydrorefining equipment under high temperature environment. The cracking of tail oil will produce some waste gas, such as hydrocarbons, nitrogen oxides, sulfur oxides, etc. In order to reduce the impact of waste gas on the environment, it is necessary to filter the waste gas when it is discharged. When the tail oil is cracked under high temperature environment, a certain amount of solid particles will be produced. The viscosity of these solid particles is relatively large, and they are easy to adhere to the flue, making them difficult to clean.

[0003] The patent document with the authorization announcement number CN217025864U discloses a thermal cracking oil and gas processing device, which belongs to the field of thermal cracking equipment, and includes a spiral coke cleaner connected to the oil and gas outlet of the rear sealed bin. The spiral coke cleaner further includes a cylinder, an oil and gas inlet of the spiral coke cleaner opened at one end of the cylinder and connected to the oil and gas outlet of the rear sealed bin, a spiral shaft passing through the cylinder, a spiral blade sleeved outside the spiral shaft, and an oil and gas channel opened on the spiral blade. The length of the oil and gas inlet of the spiral coke cleaner accounts for 1 / 4-1 / 2 of the length of the cylinder; the thermal cracking oil and gas processing device provided by the patent document is provided with a spiral shaft in the cylinder, and a spiral blade is provided on the spiral shaft. Under the drive of the transmission machine, the spiral blade rotates and removes the coke material on the inner wall of the cylinder to achieve the purpose of cleaning the inner wall of the cylinder.

[0004] When tail oil is cracked at high temperature, the flue gas contains some solid particles with high viscosity. When the processing device provided in the above patent document scrapes and cleans such impurities through spiral blades, the impurities tend to adhere to the spiral blades, making it impossible to thoroughly clean the impurities attached to the flue gas duct. Summary of the invention

[0005] The present invention provides a hydrorefining device and process suitable for cracking tail oil, aiming to solve the problem that when the cracking processing equipment in the related art drives blades to rotate in contact with the inner wall of the pipeline to clean impurities in the pipeline, some particles with high viscosity are easily adhered to the driving blades, resulting in the impurities in the flue cannot be completely cleaned.

[0006] The invention discloses a hydrorefining device suitable for cracking tail oil, comprising a tank body, wherein the tank body is provided with a feed inlet, a discharge outlet and a square smoke exhaust pipe, wherein a cleaning device is provided in the smoke exhaust pipe, and the cleaning device comprises a filtering component, a regulating component and a spraying component;

[0007] The filtering component includes two frames and two filter meshes. The two filter meshes are respectively installed on the two frames. The two frames are symmetrically arranged. The symmetry plane of the two frames is horizontally arranged and coincides with the axis of the smoke exhaust pipe. The side of the frame is in sliding contact with the side wall of the smoke exhaust pipe. The upper and lower ends of the frame are independently in sliding contact with the side wall of the smoke exhaust pipe at intervals. The filtering component is also connected with a driving member, and the driving member drives the filtering component to reciprocate in the smoke exhaust pipe;

[0008] The adjusting component is connected to the two frames at the same time. The adjusting component includes two connecting rods and two telescopic rods. Taking the side towards the air inlet end of the smoke exhaust pipe as the front side, the upper and lower ends of the connecting rod are respectively hinged to the middle parts of the sides of the two frames. The telescopic rod is located behind the connecting rod, and the upper and lower ends of the telescopic rod are respectively hinged to the middle parts of the sides of the two frames;

[0009] The spraying component includes a liquid inlet pipe and a spraying member. The spraying member is installed on the frame. The liquid inlet pipe is communicated with the spraying member and is used for conveying cleaning liquid into the spraying member. A plurality of spraying holes are arranged on the spraying member.

[0010] Improve the cleaning effect of the smoke exhaust pipe, clean the impurities inside the smoke exhaust pipe in time. The filtering component is used for filtering the waste gas to separate the solid particles in the waste gas. The adjusting component is used for adjusting the state of the filtering component after one or several operations of the tank body, so that the filtering component moves in the smoke exhaust pipe in contact with the inner wall of the smoke exhaust pipe to clean the impurities attached to the inner wall of the smoke exhaust pipe. The spraying component is used for spraying cleaning liquid on the inner wall of the smoke exhaust pipe to promote the decomposition of the oily impurities in the smoke exhaust pipe and on the filtering component, improve the cleaning effect of the smoke exhaust pipe and the filtering component, and ensure the long-term effective operation of the filtering component.

[0011] Preferably, the cleaning device further includes a collecting component. The collecting component includes a scraping plate, a rotating roller and a pressing member. The rotating roller is rotatably matched with the rear end of the frame. One end of the filter mesh is slidably matched with the two side walls of the frame and is elastically connected to the front end of the frame. The other end of the filter mesh bypasses the rotating roller and is fixed relative to the opposite end face of the frame. The pressing member is rotatably matched with the rotating roller in the opposite direction. The pressing member presses against the surface of the filter mesh and is in frictional contact with the filter mesh. A scraping plate is also arranged at the rear of the frame, and the scraping plate is attached to the filter mesh.

[0012] Preferably, racks are arranged on the upper and lower side walls of the smoke exhaust pipe. Gears are arranged at both ends of the rotating roller. The gears are meshed with the racks. The pressing member is rotatably matched with the frame. The pressing member includes a transmission part and a pressing roller. The transmission part is meshed with the gear, and the pressing roller is in frictional contact with the filter mesh.

[0013] While cleaning the exhaust pipe, the cleaning of the filter component is completed. When the frame moves from front to back, the rotating roller and the pressing member cooperate to pull the filter screen to move from the rear end of the frame. During the movement of the filter screen, its surface constantly contacts the scraper, and the scraper scrapes off the impurities on the surface of the filter screen, completing the cleaning operation of the filter screen.

[0014] Preferably, collecting members are further provided on the opposite end faces of the two frames, and a cavity for storing the filter screen is formed between the collecting members and the side wall of the exhaust pipe.

[0015] Reduce the scattering during the cleaning operation of the filter screen. The filter screen is stacked in the cavity between the collecting member and the exhaust pipe, which can effectively limit the movement of the filter screen, so as to facilitate the smooth reset after the cleaning of the filter screen is completed.

[0016] Preferably, the collecting component further includes a guiding member and a collecting groove. The collecting groove is arranged at the rear side of the exhaust pipe and is communicated with the exhaust pipe. The guiding member is arranged at the rear end of the frame, and the guiding member is docked with the rear end of the scraper.

[0017] It is convenient to collect the cleaned impurities and convenient for the staff to centrally process the impurities regularly.

[0018] Preferably, the spraying member is fixed relative to the telescopic rod. A plurality of spraying holes are provided on the end faces of the spraying member opposite to the side edges of the exhaust pipe. The spraying component further includes a winding member. The winding member is arranged outside the exhaust pipe, and the liquid inlet pipe is wound on the winding member. The liquid inlet pipe passes through the side wall of the exhaust pipe and is communicated with the inside of the spraying member.

[0019] Preferably, the spraying component further includes a spraying pipe, and the spraying pipe is respectively connected to the front ends of the two frames. The spraying pipe is communicated with the spraying member through a connecting pipe.

[0020] Improve the cleaning effect of the exhaust pipe and the filter screen. The spraying pipe is communicated with the spraying member through a connecting pipe. The spraying pipe sprays the cleaning liquid onto the side walls of the upper and lower ends of the exhaust pipe. The flowing cleaning liquid can further fall on the filter screen. The spraying component can clean the filter screen while cleaning the exhaust pipe.

[0021] Preferably, the driving member is a cylinder, and the extending end of the driving member is fixed to the spraying member.

[0022] Preferably, the air outlet of the exhaust pipe is arranged at the upper end of the rear side of the exhaust pipe.

[0023] A hydrofining process for cracked tail oil includes the following steps:

[0024] S1. Pretreatment: Remove some moisture, sulfides, and heavy metals in the tail oil through drying, extraction, preheating, and filtration.

[0025] S2. Hydrofining: Add the pretreated tail oil to the hydrofining equipment provided by the present invention to mix with hydrogen, and carry out a hydrofining reaction under high temperature and high pressure.

[0026] S3. Separation and cooling: After the reaction is completed, use a separator to separate the reaction products, extract useful light hydrocarbons and cool them.

[0027] S4. Stabilization treatment and collection: Carry out stabilization treatment on the products through a stabilizer tower to obtain refined tail oil products.

[0028] Ensure the smooth progress of the tail oil hydrofining operation, and clean the exhaust pipe of the hydrofining equipment in time after the hydrofining reaction is completed to ensure the continuous and stable operation of the hydrofining equipment. The filter component in the cleaning device is used to filter the exhaust gas to separate solid particles in the exhaust gas. The adjustment component is used to adjust the state of the filter component after one or several operations of the tank body, so that the filter component moves in the exhaust pipe in contact with the inner wall of the exhaust pipe to clean the impurities attached to the inner wall of the exhaust pipe. The spraying component is used to spray cleaning liquid on the inner wall of the exhaust pipe to promote the decomposition of oil impurities in the exhaust pipe and on the filter component, improve the cleaning effect on the exhaust pipe and the filter component, and ensure the long-term effective operation of the filter component.

[0029] The beneficial effects of the present invention are as follows:

[0030] (1) Ensure the smooth progress of the tail oil hydrofining operation, and clean the exhaust pipe of the hydrofining equipment in time after the hydrofining reaction is completed to ensure the continuous and stable operation of the hydrofining equipment. The filter component in the cleaning device is used to filter the exhaust gas to separate solid particles in the exhaust gas. The adjustment component is used to adjust the state of the filter component after one or several operations of the tank body, so that the filter component moves in the exhaust pipe in contact with the inner wall of the exhaust pipe to clean the impurities attached to the inner wall of the exhaust pipe. The spraying component is used to spray cleaning liquid on the inner wall of the exhaust pipe to promote the decomposition of oil impurities in the exhaust pipe and on the filter component, improve the cleaning effect on the exhaust pipe and the filter component, and ensure the long-term effective operation of the filter component.

[0031] (2) While cleaning the exhaust pipe, complete the cleaning of the filter component. When the frame moves from front to back, the rotating roller and the pressing member cooperate to pull the filter screen to move from the rear end of the frame. During the movement of the filter screen, its surface continuously contacts the scraper, and the scraper scrapes off the impurities on the surface of the filter screen to complete the cleaning operation of the filter screen, and collect the impurities generated by the cleaning in time. Description of the Drawings

[0032] Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0033] Figure 2 It is a schematic diagram of the initial state of the cleaning device in the smoke exhaust pipe in the present invention.

[0034] Figure 3 It is a schematic diagram of the initial state of the cleaning device in the present invention.

[0035] Figure 4 It is a schematic diagram of the state after the cleaning device moves to the air inlet end of the smoke exhaust pipe and adjusts its deflection direction.

[0036] Figure 5 It is a schematic diagram of the state when the filtering component moves from front to back in the present invention.

[0037] Figure 6 It is a schematic diagram of the connection structure of the filter screen, the frame body and the collection component in the present invention.

[0038] Reference numerals:

[0039] 1, tank body; 2, smoke exhaust pipe; 21, air outlet; 22, collection tank; 3, frame body; 31, filter screen; 32, driving member; 33, collection member; 4, connecting rod; 41, telescopic rod; 5, liquid inlet pipe; 51, spraying member; 52, spraying pipe; 53, winding member; 6, rack; 61, rotating roller; 611, gear; 62, pressing member; 63, scraping plate; 64, guiding member. Detailed implementation manners

[0040] The embodiments of the present invention will be described in detail below. The examples of the embodiments are shown in the accompanying drawings. The embodiments described below by referring to the accompanying drawings are exemplary and are intended to explain the present invention and should not be construed as limiting the present invention.

[0041] Such as Figure 1 , Figure 2 and Figure 4As shown in the figure, the hydrofining equipment for cracking tail oil of the present invention includes a tank body 1. The tank body 1 is provided with a feed inlet, a discharge outlet and a smoke exhaust pipe 2. The pretreated tail oil is added into the tank body 1 from the feed inlet and mixed with hydrogen in the tank body 1. The waste gas generated during the reaction is discharged from the smoke exhaust pipe 2. A cleaning device is arranged in the smoke exhaust pipe 2. The cleaning device includes a filtering component, an adjusting component and a spraying component. The filtering component is used for filtering the waste gas to separate solid particles in the waste gas. The adjusting component is used for adjusting the state of the filtering component after one or several operations of the tank body 1, so that the filtering component moves along the inner wall of the smoke exhaust pipe 2 in the smoke exhaust pipe 2 to clean the impurities attached to the inner wall of the smoke exhaust pipe 2. The spraying component is used for spraying a cleaning liquid onto the inner wall of the smoke exhaust pipe 2 to promote the decomposition of oil impurities in the smoke exhaust pipe 2 and on the filtering component, improve the cleaning effect on the smoke exhaust pipe 2 and the filtering component, and ensure the long-term effective operation of the filtering component.

[0042] The smoke exhaust pipe 2 is a square pipe. The side facing the air inlet end of the smoke exhaust pipe 2 is the front side. The rear end of the smoke exhaust pipe 2 is blocked. The air outlet 21 is arranged on the upper side of the rear end of the smoke exhaust pipe 2. To reduce the pollution of the waste gas to the environment, the air outlet 21 is further connected to a waste gas purification device, where the purification device can be a scrubbing tower.

[0043] As Figures 2 to 5 shown in the figure, the filtering component includes two frames 3 and two filter meshes 31. The two filter meshes 31 are respectively installed on the two frames 3. The two frames 3 are symmetrically arranged. The symmetry plane of the two frames 3 is horizontally arranged and coincides with the axis of the smoke exhaust pipe 2. The side edges of the frame 3 slide along the side wall of the smoke exhaust pipe 2. The upper and lower ends of the frame 3 are movably and independently in contact with the side wall of the smoke exhaust pipe 2 and slide. When the frame 3 moves along the side wall of the smoke exhaust pipe 2, the impurities attached to the side wall of the smoke exhaust pipe 2 are scraped off to achieve the preliminary cleaning of the side wall of the smoke exhaust pipe 2. The frame 3 is in the shape of a rectangular frame. To improve the cleaning effect on the side wall of the smoke exhaust pipe 2 during the movement of the frame 3 along the side wall of the smoke exhaust pipe 2, the upper and lower ends of the frame 3 are both in the shape of inclined edges to facilitate better fitting of the frame 3 with the side wall of the smoke exhaust pipe 2. In the initial state, the filtering component is close to the air outlet end of the smoke exhaust pipe 2. The front ends of the two frames 3 are respectively in contact with the upper and lower side walls of the smoke exhaust pipe 2. The filter mesh 31 on the filtering component filters the waste gas. The filtering component is also connected with a driving member 32. After the hydrofining equipment stops operating, the driving member 32 drives the filtering component to move in the smoke exhaust pipe 2 and clean the smoke exhaust pipe 2 in time.

[0044] During the process of the two frames 3 moving along the smoke exhaust pipe 2, the scraped impurities gradually accumulate at the front end of the lower frame 3. After the frame 3 moves to the front end of the smoke exhaust pipe 2, the adjusting component drives the inclination direction of the two frames 3 to change. The state after the inclination direction of the frame 3 changes is as Figure 4 and Figure 5As shown, the frame 3 needs to carry the accumulated impurities and transport the impurities to the rear end of the exhaust pipe 2. A collection tank 22 for collecting impurities is provided at the rear end of the exhaust pipe 2.

[0045] The spraying assembly includes a liquid inlet pipe 5 and a spraying member 51. The spraying member 51 is installed on the frame 3. The liquid inlet pipe 5 is communicated with the spraying member 51 and is used to convey the cleaning liquid into the spraying member 51. A number of spraying holes are provided on the spraying member 51. Taking the end of the frame 3 that fits the exhaust pipe 2 as its cleaning end, the spraying member 51 is located at the rear side of the cleaning end of the exhaust pipe 2. After the frame 3 cleans the exhaust pipe 2 by scraping, a thin layer of oily substance still remains on the exhaust pipe 2. The spraying assembly sprays the cleaning liquid on the side wall of the exhaust pipe 2 after the scraping action of the frame 3 to promote the decomposition of the oily substance on the exhaust pipe 2 and further improve the cleaning effect on the exhaust pipe 2.

[0046] The adjusting assembly is connected to the two frames 3 at the same time. The adjusting assembly includes two connecting rods 4 and two telescopic rods 41. Taking the side facing the air inlet end of the exhaust pipe 2 as the front side, the upper and lower ends of the connecting rod 4 are respectively hinged to the middle parts of the sides of the two frames 3. The telescopic rod 41 is located at the rear side of the connecting rod 4. The upper and lower ends of the telescopic rod 41 are respectively hinged to the middle parts of the sides of the two frames 3. When the telescopic rod 41 expands and contracts, it drives the two frames 3 to rotate around the position where they are hinged to the connecting rod 4 to change the inclination direction of the two frames 3. After the driving member 32 drives the two frames 3 to move to the front end of the exhaust pipe 2, the length of the telescopic rod 41 extends to push the two frames 3 to rotate. An arc-shaped plate is provided on the front side of the exhaust pipe 2. When the lower frame 3 rotates, the front end of its front side fits and slides along the inner wall of the arc-shaped plate. So that when the lower frame 3 rotates, the impurities accumulated on its front side are pushed up by the frame 3 and fall on the filter screen 31 on the upper surface of the frame 3 during the rotation process of the frame 3. The cleaning device further includes a collection assembly, and the collection assembly is used to clean and collect the impurities on the filter screen 31 during the process of the frame 3 moving from front to back.

[0047] The spraying member 51 is fixed relative to the telescopic rod 41. A number of spraying holes are provided on the end faces of the spraying member 51 opposite to the respective side walls of the exhaust pipe 2. The spraying assembly further includes a winding member 53. The winding member 53 is provided outside the exhaust pipe 2. The liquid inlet pipe 5 is wound on the winding member 53. The liquid inlet pipe 5 passes through the side wall of the exhaust pipe 2 and is communicated with the inside of the spraying member 51. The winding member 53 includes a seat body and a winding drum. The winding drum is rotationally matched with the seat body through a torsion spring. The liquid inlet pipe 5 is wound on the winding drum. When the spraying member 51 moves forward in the exhaust pipe 2 with the filtering assembly, it pulls the liquid inlet pipe 5 to unwind and makes the torsion spring store energy. When the spraying member 51 moves backward with the filtering assembly, the torsion spring drives the winding drum to rotate and automatically winds up the liquid inlet pipe 5.

[0048] To further improve the cleaning effect on the smoke exhaust pipe 2, the spraying assembly further includes a spray pipe 52. The spray pipe 52 is respectively connected to the front end parts of the two frames 3. The spray pipe 52 is communicated with the spraying member 51 through a connecting pipe. The spray pipe 52 sprays cleaning liquid onto the side walls of the upper and lower ends of the smoke exhaust pipe 2. The flowing cleaning liquid can further fall on the filter screen 31. The spraying assembly can clean the filter screen 31 while cleaning the smoke exhaust pipe 2.

[0049] As Figure 5 and Figure 6 shown, the collection assembly includes a scraping plate 63, a rotating roller 61 and a pressing member 62. The rotating roller 61 is rotationally matched with the rear end part of the frame 3. One end of the filter screen 31 is slidably matched with the two side walls of the frame 3 and is elastically connected to the front end part of the frame 3. Chute grooves are provided on both sides of the frame 3. A slider slidably matched with the chute grooves is fixed at the end of the filter screen 31. The slider and the front end part of the frame 3 can be connected by a spring. The other end of the filter screen 31 bypasses the rotating roller 61 and is fixed to the opposite end faces of the frame 3. The pressing member 62 is rotationally matched in the reverse direction of the rotating roller 61. The pressing member 62 presses against the surface of the filter screen 31 and is in frictional contact with the filter screen 31. A scraping plate 63 is further provided at the rear side of the frame 3. The scraping plate 63 is attached to the filter screen 31. When the frame 3 moves from front to back, the rotating roller 61 and the pressing member 62 cooperate to pull the filter screen 31 to move from the rear end part of the frame 3. During the movement of the filter screen 31, its surface constantly contacts the scraping plate 63. The scraping plate 63 scrapes off the impurities on the surface of the filter screen 31. A guiding member 64 is provided at the rear end part of the frame 3. The guiding member 64 is butted against the rear end part of the scraping plate 63. The impurities scraped off by the scraping plate 63 fall on the rear side of the frame 3 through the guiding member 64 and are pushed to the collection tank 22 during the backward movement of the frame 3 and finally fall into the collection tank 22. The collection tank 22 is detachably connected to the smoke exhaust pipe 2. The staff regularly cleans the collection tank 22.

[0050] The upper and lower side walls of the smoke exhaust pipe 2 are provided with racks 6. The two ends of the rotating roller 61 are provided with gears 611. When the adjusting assembly drives the rear ends of the two frames 3 to fit with the upper and lower side walls of the smoke exhaust pipe 2, the gears 611 at both ends of the rotating roller 61 are engaged with the racks 6. When the frame 3 moves from front to back, the rotating roller 61 rotates under the meshing action of the gear 611 and the rack 6. The pressing member 62 is rotationally matched with the frame 3. The pressing member 62 includes a transmission part and a pressing roller. The transmission part is engaged with the gear 611. The pressing roller is in frictional contact with the filter screen 31. The transmission part rotates in the opposite direction to the gear 611 and makes the pressing roller tightly press the filter screen 31 to rotate. The filter screen 31 is pulled down by the rotation of the rotating roller 61 and the pressing roller, and the spring is stretched to store energy. After the gear 611 is disengaged from the rack 6, the filter screen 31 is reset under the elastic force of the coil spring. A collecting member 33 is also provided on the opposite end faces of the two frames 3. A cavity for storing the filter screen 31 is formed between the collecting member 33 and the side wall of the smoke exhaust pipe 2. When the filter screen 31 is cleaned, it is stacked in the cavity between the collecting member 33 and the smoke exhaust pipe 2.

[0051] The specific operation steps of the hydrotreating process of cracked tail oil are as follows:

[0052] S1. Pretreatment, removing some impurities such as moisture, sulfides, and heavy metals in the tail oil by means of drying, extraction, preheating, and filtration;

[0053] S2. Hydrotreating, adding the pretreated tail oil into the hydrotreating equipment provided by the present invention to be mixed with hydrogen, and undergoing a hydrotreating reaction under high temperature and high pressure to convert heavy hydrocarbons into lighter hydrocarbons;

[0054] S3. Separation and cooling, after the reaction is completed, using a separator to separate the reaction products, extracting useful light hydrocarbons and cooling them;

[0055] S4. Stabilization treatment and collection, performing a stabilization treatment on the product through a stabilizer tower to remove hydrogen sulfide, ammonia, water, and gaseous hydrogen generated by a small amount of decomposition during the reaction, and obtaining a refined tail oil product.

[0056] The hydrotreating equipment and process provided by the present invention improve the cleaning effect of impurities inside the smoke exhaust pipe in the hydrotreating equipment, avoid the blockage of the smoke exhaust pipe affecting the emission of flue gas, and ensure the continuous and stable operation of the hydrotreating equipment.

[0057] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by terms such as "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present invention.

[0058] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include at least one of such features. In the description of the present invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise specifically and clearly defined.

[0059] Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are exemplary and should not be construed as a limitation to the present invention. Those of ordinary skill in the art can make changes, modifications, substitutions, and variations to the above embodiments within the scope of the present invention.

Claims

1. A hydrotreating device suitable for cracking tail oil, comprising a tank body (1), the tank body (1) being provided with a feed inlet, a discharge outlet and a square exhaust pipe (2), characterized in that: A cleaning device is provided in the smoke exhaust duct (2), and the cleaning device comprises a filtering component, a regulating component and a spraying component; The filter assembly comprises two frames (3) and two filter screens (31), the two filter screens (31) being mounted on the two frames (3) respectively, the two frames (3) being symmetrically arranged, the symmetry planes of the two frames (3) being arranged horizontally and coinciding with the axis of the smoke exhaust pipe (2), the side edges of the frames (3) slidingly fitting against the side walls of the smoke exhaust pipe (2), the upper and lower ends of the frames (3) slidingly fitting against the side walls of the smoke exhaust pipe (2) at movable intervals independently, and the filter assembly is further connected to a driving member (32), the driving member (32) driving the filter assembly to reciprocate in the smoke exhaust pipe (2); The adjustment component is connected to the two frames (3) at the same time, and comprises two connecting rods (4) and two telescopic rods (41), with the side facing the air inlet end of the smoke exhaust pipe (2) as the front side, the upper and lower ends of the connecting rod (4) are respectively hinged to the middle of the sides of the two frames (3), the telescopic rod (41) is located at the rear side of the connecting rod (4), and the upper and lower ends of the telescopic rod (41) are respectively hinged to the middle of the sides of the two frames (3); The spray assembly comprises a liquid inlet pipe (5) and a spray component (51); the spray component (51) is mounted on the frame (3); the liquid inlet pipe (5) is connected to the spray component (51) and is used to transport cleaning liquid into the spray component (51); and a plurality of spray holes are provided on the spray component (51); An arc-shaped plate is provided on the front side of the smoke exhaust duct (2), and when the lower frame (3) rotates, the front end thereof slides against the inner wall of the arc-shaped plate, so that when the lower frame (3) rotates, impurities accumulated on the front side thereof are pushed up by the frame (3) and fall onto the filter screen (31) on the upper surface of the frame (3) during the rotation of the frame (3); The cleaning device further comprises a collecting assembly, the collecting assembly comprising a scraper (63), a rotating roller (61) and a pressing member (62), the rotating roller (61) being rotatably matched with the rear end of the frame (3), one end of the filter screen (31) being slidably matched with the two side walls of the frame (3) and being elastically connected with the front end of the frame (3), the other end of the filter screen (31) passing around the rotating roller (61) and being fixed relative to the end surface opposite to the frame (3), the pressing member (62) being rotatably matched with the rotating roller (61), the pressing member (62) being pressed against the surface of the filter screen (31) and being in frictional contact with the filter screen (31), and a scraper (63) being further provided on the rear side of the frame (3), the scraper (63) being in contact with the filter screen (31); The upper and lower side walls of the smoke exhaust duct (2) are provided with racks (6), and gears (611) are provided at both ends of the rotating roller (61). The gears (611) mesh with the racks (6), and the pressing member (62) rotates relative to the frame (3). The pressing member (62) includes a transmission part and a pressing roller, and the transmission part meshes with the gears (611). The pressing roller is in frictional contact with the filter screen (31). A collecting piece (33) is also provided on the end surfaces of the two frames (3) facing each other, and a cavity for storing the filter screen (31) is formed between the collecting piece (33) and the side wall of the smoke exhaust pipe (2).

2. The hydrotreating equipment applicable to cracking tail oil according to claim 1, characterized in that, The collecting assembly further comprises a guide member (64) and a collecting trough (22); the collecting trough (22) is arranged at the rear side of the smoke exhaust duct (2); the collecting trough (22) is communicated with the smoke exhaust duct (2); the guide member (64) is arranged at the rear end of the frame (3); the guide member (64) is butted against the rear end of the scraper (63).

3. The hydrotreating equipment applicable to cracking tail oil according to claim 1, characterized in that, The spray component (51) is fixed relative to the telescopic rod (41), and a plurality of spray holes are provided on the end faces of the spray component (51) opposite to each side of the smoke exhaust pipe (2). The spray assembly further comprises a winding component (53), the winding component (53) being arranged outside the smoke exhaust pipe (2), the liquid inlet pipe (5) being wound on the winding component (53), and the liquid inlet pipe (5) passing through the side wall of the smoke exhaust pipe (2) and communicating with the interior of the spray component (51).

4. The hydrotreating equipment applicable to cracking tail oil according to claim 3, characterized in that, The spray assembly further comprises a spray pipe (52), the spray pipe (52) being connected to the front ends of the two frames (3) respectively, and the spray pipe (52) being connected to the spray member (51) via a connecting pipe.

5. The hydrotreating equipment applicable to cracking tail oil according to claim 1, characterized in that, The driving member (32) is a cylinder, and the extended end of the driving member (32) is fixed to the spray member (51).

6. The hydrotreating equipment applicable to cracking tail oil according to claim 1, characterized in that, The air outlet (21) of the smoke exhaust pipe (2) is arranged at the upper end of the rear side of the smoke exhaust pipe (2).

7. A hydrofining process for cracking tail oil, characterized in that: The following steps are involved: S1. Pretreatment: removing some water, sulfide and heavy metals in the tail oil by drying, extraction, preheating and filtering; S2, hydrofining, adding the pretreated tail oil to the hydrofining equipment according to any one of claims 1 to 6 to mix with hydrogen, and causing a hydrogenation reaction under high temperature and high pressure; S3, separation and cooling, after the reaction is completed, the reaction product is separated using a separator, useful light hydrocarbons are extracted and cooled; S4, stabilization treatment and collection, the product is stabilized by a stabilization tower to obtain a refined tail oil product.

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