Hydrofining equipment and process suitable for cracking tail oil

Abstract

The invention relates to the technical field of flue cleaning, and particularly discloses hydrofining equipment and process suitable for cracking tail oil, the hydrofining equipment comprises a tank body, the tank body is provided with a feeding port, a discharging port and a smoke exhaust pipeline, a cleaning device is arranged in the smoke exhaust pipeline, and the cleaning device comprises a filtering assembly, an adjusting assembly and a spraying assembly; the filtering assembly comprises two frame bodies and two filtering nets, the two filtering nets are installed on the two frame bodies correspondingly, the side edges of the frame bodies are attached to the side wall of the smoke exhaust pipeline to slide, and the filtering assembly is connected with a driving part; the adjusting assembly is connected with the two frame bodies at the same time and comprises two connecting rods and two telescopic rods. The spraying assembly comprises a liquid inlet pipe and a spraying piece; the hydrofining process of the cracking tail oil comprises the steps of pretreatment, hydrofining, separation and cooling, stable treatment and collection, the technical scheme of the invention ensures that the tail oil hydrofining operation is smoothly carried out, and a smoke exhaust pipeline is cleaned in time 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; The filter assembly includes two frames and two filter screens, the two filter screens are respectively mounted on the two frames, the two frames are symmetrically arranged, the symmetry planes of the two frames are horizontally arranged and coincide with the axis of the smoke exhaust pipe, the sides of the frames slide against the side walls of the smoke exhaust pipe, the upper and lower ends of the frames slide against the side walls of the smoke exhaust pipe independently at movable intervals, and the filter assembly is also connected to a driving member, which drives the filter assembly to reciprocate in the smoke exhaust pipe; The adjustment assembly is connected to the two frames at the same time, and the adjustment assembly includes two connecting rods and two telescopic rods, with the side facing 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 of the two frame sides, the telescopic rod is located at the rear side of the connecting rod, and the upper and lower ends of the telescopic rod are respectively hinged to the middle of the two frame sides; The spray assembly comprises a liquid inlet pipe and a spray element. The spray element is mounted on the frame. The liquid inlet pipe is connected to the spray element and is used to transport cleaning liquid into the spray element. The spray element is provided with a plurality of spray holes.

[0007] Improve the cleaning effect of the smoke exhaust duct, and clean the impurities inside the smoke exhaust duct in time. The filter component is used to filter the exhaust gas to separate the 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 are completed, so that the filter component moves in the smoke exhaust duct in accordance with the inner wall of the smoke exhaust duct to clean the impurities attached to the inner wall of the smoke exhaust duct. The spray component is used to spray cleaning liquid onto the inner wall of the smoke exhaust duct to promote the decomposition of oil impurities in the smoke exhaust duct and on the filter component, improve the cleaning effect of the smoke exhaust duct and the filter component, and ensure the long-term and effective operation of the filter component.

[0008] Preferably, the cleaning device also includes a collecting assembly, which includes a scraper, a rotating roller and a pressing piece. The rotating roller is rotatably matched with the rear end of the frame, one end of the filter 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 passes around the rotating roller and is fixed relative to the end face opposite to the frame, the pressing piece is rotatably matched with the rotating roller, the pressing piece is pressed against the surface of the filter and is in frictional contact with the filter, and a scraper is also provided on the rear side of the frame, and the scraper is in contact with the filter.

[0009] Preferably, racks are provided on the upper and lower side walls of the smoke exhaust duct, gears are provided at both ends of the rotating roller, the gears are meshed with the racks, the clamping piece rotates relative to the frame, the clamping piece includes a transmission part and a clamping roller, the transmission part is meshed with the gears, and the clamping roller is in frictional contact with the filter.

[0010] While cleaning the smoke exhaust duct, the filter assembly is cleaned at the same time. When the frame moves from front to back, the rotating roller and the clamping piece cooperate to pull the filter from the rear end of the frame. During the movement of the filter, its surface constantly contacts the scraper, and the scraper scrapes off the impurities on the surface of the filter to complete the cleaning operation of the filter.

[0011] Preferably, a collecting piece is further provided on the end surfaces of the two frames facing away from each other, and a cavity for storing the filter is formed between the collecting piece and the side wall of the smoke exhaust duct.

[0012] To reduce the mess during the filter cleaning operation, the filters are stacked in the cavity between the collector and the smoke exhaust duct, which can effectively restrict the movement of the filters so that they can be smoothly reset after cleaning.

[0013] Preferably, the collecting assembly further comprises a guide member and a collecting trough, wherein the collecting trough is arranged at the rear side of the smoke exhaust duct, the collecting trough is communicated with the smoke exhaust duct, the guide member is arranged at the rear end of the frame, and the guide member is docked with the rear end of the scraper.

[0014] It is convenient to collect the cleaned impurities and convenient for the staff to carry out centralized treatment of the impurities on a regular basis.

[0015] Preferably, the spray member is fixed relative to the telescopic rod, and a plurality of spray holes are provided on the end faces of the spray member opposite to each side of the smoke exhaust pipe. The spray assembly also includes a winding member, which is arranged on the outside of the smoke exhaust pipe, and the liquid inlet pipe is wound on the winding member, and the liquid inlet pipe passes through the side wall of the smoke exhaust pipe and is connected to the interior of the spray member.

[0016] Preferably, the spray assembly further comprises a spray pipe, wherein the spray pipe is respectively connected to the front ends of the two frames, and the spray pipe is communicated with the spray member via a connecting pipe.

[0017] To improve the cleaning effect of the smoke exhaust pipe and the filter, the spray pipe is connected to the spray component through a connecting pipe. The spray pipe sprays cleaning liquid to the side walls of the upper and lower ends of the smoke exhaust pipe. The flowing cleaning liquid can further fall on the filter. The spray component can clean the filter while cleaning the smoke exhaust pipe.

[0018] Preferably, the driving member is a cylinder, and the protruding end of the driving member is fixed to the spraying member.

[0019] Preferably, the air outlet of the smoke exhaust duct is arranged at the upper end of the rear side of the smoke exhaust duct.

[0020] A hydrofining process for cracking tail oil comprises the following steps: 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 into the hydrofining equipment provided by the present invention to mix with hydrogen, and undergoing 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.

[0021] Ensure the smooth progress of tail oil hydrotreating operation, and clean the exhaust pipe of the hydrotreating equipment in time after the hydrogenation reaction is completed, to ensure the continuous and stable operation of the hydrotreating equipment. The filter component in the cleaning device is used to filter the exhaust gas to separate the 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 are completed, so that the filter component moves in the exhaust pipe in accordance with the inner wall of the exhaust pipe, and the impurities attached to the inner wall of the exhaust pipe are cleaned. The spray 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 of the exhaust pipe and the filter component, and ensure the long-term effective operation of the filter component.

[0022] The beneficial effects of the present invention are: (1) Ensure the smooth progress of tail oil hydrotreating operation, and clean the exhaust pipe of the hydrotreating equipment in time after the hydrogenation reaction is completed to ensure the continuous and stable operation of the hydrotreating equipment. The filter component in the cleaning device is used to filter the exhaust gas to separate the 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 are completed, so that the filter component moves in the exhaust pipe in accordance with the inner wall of the exhaust pipe to clean the impurities attached to the inner wall of the exhaust pipe. The spray 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 of the exhaust pipe and the filter component, and ensure the long-term effective operation of the filter component.

[0023] (2) While cleaning the smoke exhaust duct, the filter assembly is cleaned at the same time. When the frame moves from front to back, the rotating roller and the clamping part cooperate to pull the filter from the rear end of the frame. During the movement of the filter, its surface is constantly in contact with the scraper. The scraper scrapes off the impurities on the surface of the filter, completing the cleaning operation of the filter and collecting the impurities generated by the cleaning in time. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0025] Figure 2 It is a schematic diagram of the initial state of the cleaning device in the smoke exhaust duct of the present invention.

[0026] Figure 3 It is a schematic diagram of the initial state of the cleaning device in the present invention.

[0027] Figure 4 It is a schematic diagram of the state of the cleaning device in the present invention after it moves to the air inlet end of the smoke exhaust pipe and adjusts the deflection direction.

[0028] Figure 5 It is a schematic diagram of the state of the filter assembly in the present invention when it moves from front to back.

[0029] Figure 6 It is a schematic diagram of the connection structure of the filter screen, frame and collection assembly in the present invention.

[0030] Reference numerals: 1. Tank body; 2. Smoke exhaust duct; 21. Air outlet; 22. Collecting tank; 3. Frame; 31. Filter; 32. Driving member; 33. Collecting 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. Scraper; 64. Guide member. DETAILED DESCRIPTION

[0031] Embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to be used to explain the present invention, but should not be understood as limiting the present invention.

[0032] like Figure 1 , Figure 2 and Figure 4 As shown, the hydrorefining equipment suitable for cracking tail oil of the present invention comprises a tank body 1, on which a feed port, a feed port and a smoke exhaust pipe 2 are provided. The pretreated tail oil is added into the tank body 1 from the feed port 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 provided in the smoke exhaust pipe 2, and the cleaning device comprises a filter component, an adjustment component and a spray component. The filter component is used to filter the waste gas to separate solid particles in the waste gas. The adjustment component is used to adjust the state of the filter component after one or several operations of the tank body 1 are completed, so that the filter component moves in the smoke exhaust pipe 2 in contact with the inner wall of the smoke exhaust pipe 2, and impurities attached to the inner wall of the smoke exhaust pipe 2 are cleaned. The spray component is used to spray 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 filter component, improve the cleaning effect of the smoke exhaust pipe 2 and the filter component, and ensure the long-term effective operation of the filter component.

[0033] The smoke exhaust duct 2 is a square tube, with the side facing the air inlet end of the smoke exhaust duct 2 as the front side, the rear end of the smoke exhaust duct 2 is blocked, and the air outlet 21 is arranged on the upper side of the rear end of the smoke exhaust duct 2. In order to reduce the pollution of exhaust gas to the environment, the air outlet 21 is further connected to the exhaust gas purification equipment, wherein the purification equipment can be a washing tower.

[0034] like Figures 2 to 5 As shown, the filter assembly includes two frames 3 and two filter screens 31. The two filter screens 31 are respectively installed on the two frames 3. The two frames 3 are symmetrically arranged. The symmetry planes of the two frames 3 are horizontally arranged and coincide with the axis of the smoke exhaust pipe 2. The sides of the frames 3 slide in contact with the side walls of the smoke exhaust pipe 2. The upper and lower ends of the frames 3 slide in contact with the side walls of the smoke exhaust pipe 2 independently. When the frames 3 move in contact with the side walls of the smoke exhaust pipe 2, impurities attached to the side walls of the smoke exhaust pipe 2 are scraped off, thereby achieving preliminary cleaning of the side walls of the smoke exhaust pipe 2. The frames 3 are rectangular frames. In order to improve the cleaning effect of the side wall of the smoke exhaust duct 2 during the movement, the upper and lower ends of the frame 3 are both beveled to facilitate better fit between the frame 3 and the side wall of the smoke exhaust duct 2. In the initial state, the filter assembly is close to the air outlet end of the smoke exhaust duct 2, and the front ends of the two frames 3 are respectively fitted with the upper and lower side walls of the smoke exhaust duct 2. The filter screen 31 on the filter assembly filters the exhaust gas. The filter assembly is also connected to a drive member 32. After the hydrorefining equipment stops operating, the drive member 32 drives the filter assembly to move in the smoke exhaust duct 2 and cleans the smoke exhaust duct 2 in time.

[0035] During the movement of the two frames 3 in close contact with the 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 exhaust pipe 2, the adjustment component drives the tilt direction of the two frames 3 to change. The state of the frame 3 after the tilt direction changes is as follows: Figure 4 and Figure 5 As shown, the frame 3 needs to carry the accumulated impurities and transport the impurities to the rear end of the smoke exhaust pipe 2. The rear end of the smoke exhaust pipe 2 is provided with a collecting tank 22 for collecting impurities.

[0036] The spray assembly includes a liquid inlet pipe 5 and a spray component 51. The spray component 51 is installed 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. A number of spray holes are provided on the spray component 51. The end of the frame 3 that is in contact with the smoke exhaust pipe 2 is its cleaning end. The spray component 51 is located on the rear side of the cleaning end of the smoke exhaust pipe 2. After the frame 3 cleans the smoke exhaust pipe 2 by scraping, a thin layer of oily substance will still remain on the smoke exhaust pipe 2. After the scraping action of the frame 3, the spray assembly sprays cleaning liquid onto the side wall of the smoke exhaust pipe 2 to promote the decomposition of the oily substance on the smoke exhaust pipe 2, thereby further improving the cleaning effect of the smoke exhaust pipe 2.

[0037] The adjustment component is connected to the two frames 3 at the same time. The adjustment component includes two connecting rods 4 and two telescopic rods 41. The side facing the air inlet end of the smoke exhaust pipe 2 is 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. The upper and lower ends of the telescopic rod 41 are respectively hinged to the middle of the sides of the two frames 3. When the telescopic rod 41 is extended and retracted, it drives the two frames 3 to rotate around the position where it is hinged with the connecting rod 4 to change the inclination direction of the two frames 3. The driving member 32 drives the two After the frame 3 moves to the front end of the smoke exhaust duct 2, the length of the telescopic rod 41 is extended to push the two frames 3 to rotate. An arc plate is provided on the front side of the smoke exhaust duct 2. When the lower frame 3 rotates, its front end slides against the inner wall of the arc plate, so that when the lower frame 3 rotates, impurities accumulated on the front side are pushed up by the frame 3 and fall on the filter 31 on the upper surface of the frame 3 during the rotation of the frame 3. The cleaning device also includes a collecting component, which is used to clean and collect impurities on the filter 31 when the frame 3 moves from front to back.

[0038] The spray piece 51 is fixed relative to the telescopic rod 41, and a plurality of spray holes are provided on the end faces of the spray piece 51 opposite to each side of the smoke exhaust pipe 2. The spray assembly also includes a winding piece 53, which is arranged on the outside of the smoke exhaust pipe 2. The liquid inlet pipe 5 is wound on the winding piece 53, and the liquid inlet pipe 5 passes through the side wall of the smoke exhaust pipe 2 and is connected with the inside of the spray piece 51. The winding piece 53 includes a seat body and a reel, and the reel is rotatably matched with the seat body through a coil spring. The liquid inlet pipe 5 is wound on the reel. When the spray piece 51 moves from back to front in the smoke exhaust pipe 2 along with the filter assembly, the liquid inlet pipe 5 is unwound and the torsion spring is stored. When the spray piece 51 moves backward along with the filter assembly, the coil spring drives the reel to rotate, and the liquid inlet pipe 5 is automatically wound.

[0039] In order to further improve the cleaning effect of the smoke exhaust pipe 2, the spray assembly also includes a spray pipe 52, which is respectively connected to the front ends of the two frames 3. The spray pipe 52 is connected to the spray part 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 31. The spray assembly can clean the filter 31 while cleaning the smoke exhaust pipe 2.

[0040] like Figure 5 and Figure 6As shown, the collecting assembly includes a scraper 63, a rotating roller 61 and a pressing member 62. The rotating roller 61 rotates with the rear end of the frame 3, one end of the filter 31 slides with the two side walls of the frame 3 and is elastically connected to the front end of the frame 3. Both sides of the frame 3 are provided with slide grooves, and the end of the filter 31 is fixed with a slider that slides with the slide groove. The slider and the front end of the frame 3 can be connected by a spring. The other end of the filter 31 bypasses the rotating roller 61 and is fixed relative to the end face opposite to the frame 3. The pressing member 62 rotates in the opposite direction to the rotating roller 61, and the pressing member 62 presses on the surface of the filter 31 and is in friction contact with the filter 31. A scraper 63 is also provided on the rear side of the frame 3. The scraper 63 fits with 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 from the rear end of the frame 3 to move. During the movement of the filter screen 31, its surface is constantly in contact with the scraper 63. The scraper 63 scrapes off the impurities on the surface of the filter screen 31. A guide member 64 is provided at the rear end of the frame 3. The guide member 64 is connected to the rear end of the scraper 63. The impurities scraped off by the scraper 63 pass through the guide member 64 and fall on the rear side of the frame 3. In the process of the frame 3 moving backward, the impurities are pushed to move to the collection tank 22 and finally fall into the collection tank 22. The collection tank 22 is detachably connected to the smoke exhaust pipe 2, and the staff cleans the collection tank 22 regularly.

[0041] 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. When the adjustment component drives the rear ends of the two frames 3 to fit with the upper and lower side walls of the smoke exhaust duct 2, the gears 611 at both ends of the rotating roller 61 mesh with the racks 6. When the frame 3 moves from front to back, the rotating roller 61 rotates under the meshing action of the gears 611 and 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. The transmission part meshes with the gears 611, and the pressing roller rubs against the filter screen 31. The transmission part and the gear 611 rotate in opposite directions by rubbing contact, and the pressure roller presses the filter screen 31 to rotate. The filter screen 31 is pulled downward by the rotation of the rotating roller 61 and the pressure roller, and the spring is stretched to store force. After the gear 611 is disengaged from the rack 6, the filter screen 31 is reset by the elastic force of the coil spring. Collecting parts 33 are 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 part 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 part 33 and the smoke exhaust pipe 2.

[0042] The specific operating steps of the hydrorefining process of cracking tail oil are as follows: S1. Pretreatment: removing some of the water, sulfide, heavy metal and other impurities in the tail oil by drying, extraction, preheating and filtering; S2, hydrofining, adding the pretreated tail oil into the hydrofining equipment provided by the present invention to mix with hydrogen, and causing a hydrogenation reaction under high temperature and high pressure to convert heavy hydrocarbons into lighter hydrocarbons; 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 remove hydrogen sulfide, ammonia, water and a small amount of gaseous hydrogen produced by decomposition during the reaction to obtain a refined tail oil product.

[0043] The hydrorefining equipment and process provided by the present invention improve the cleaning effect of impurities inside the smoke exhaust pipe in the hydrorefining equipment, avoid blockage of the smoke exhaust pipe affecting the emission of flue gas, and ensure the continuous and stable operation of the hydrorefining equipment.

[0044] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0045] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0046] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present invention. A person skilled in the art may change, modify, replace and vary the above embodiments within the scope of the present invention.

Claims

1. A hydrotreating equipment 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). The spray component (51) is provided with a plurality of spray holes.

2. The hydrotreating equipment applicable to cracking tail oil according to claim 1, characterized in that, 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).

3. The hydrotreating equipment applicable to cracking tail oil according to claim 2, characterized in that, 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), and the pressing roller is in frictional contact with the filter screen (31).

4. The hydrotreating equipment applicable to cracking tail oil according to claim 2, characterized in that, A collecting piece (33) is also provided on the end surfaces of the two frames (3) facing away from 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).

5. The hydrotreating equipment applicable to cracking tail oil according to claim 2, 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).

6. 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).

7. The hydrotreating equipment applicable to cracking tail oil according to claim 6, 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.

8. 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).

9. 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).

10. 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 described in any one of claims 1 to 9 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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