Anti-blocking structure for removing particles in ascending gas of slurry bed vacuum tower

Abstract

The utility model relates to the technical field of slurry bed vacuum towers, and discloses an anti-blocking structure for removing particles in ascending gas of a slurry bed vacuum tower, which comprises a tower body, six fillers are arranged in the tower body, the six fillers are BED1, BED2, BED3, BED4, BED5 and BED6 in sequence from top to bottom, the six fillers are longitudinally arranged at intervals in sequence, and the six fillers are arranged in the tower body. The top of each of the six fillers is provided with a filler pressing ring, the bottom of each of the six fillers is provided with a filler support and a truss girder, and the BED1, the BED2, the BED3, the BED4 and the BED5 are structured fillers. A traditional four-line oil collecting tank is changed into the design that the lifting cylinders incline towards the extraction opening and are not equal in height, so that under the condition that the extraction opening is blocked, liquid is accumulated to the height of the low lifting cylinder and overflows from the low lifting cylinder, the high lifting cylinder is reserved to enable gas phase to pass, and the gas-liquid shunting function of the oil collecting tank can still be reserved; and the conditions of entrainment and blockage of the gas raising cylinder caused by gas and liquid walking in the same place are avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of slurry bed vacuum towers, in particular to an anti-blocking structure for removing particles in ascending gas of a slurry bed vacuum tower. Background Art

[0002] A slurry bed vacuum tower is a critical piece of equipment used in petrochemical processes to remove impurities from feedstock and extract the target product. This equipment typically includes the following key components and functions: a packing layer, a feed inlet, a pressure reduction device, a gas outlet, a liquid collector, a bottom liquid collector, and a control system. The packing layer is the core component of the slurry bed vacuum tower, increasing surface area and promoting gas-liquid contact for efficient separation and mass transfer. Its type and layout are crucial to equipment performance.

[0003] Currently, most slurry bed vacuum towers operate at between 77% and 85% of their actual crude oil processing load. Feedback from vacuum tower operations indicates that the tower load has reached its upper limit, operating parameters deviate significantly from design, and the fourth vacuum line is already carrying heavy slurry components, limiting the processing capacity of the entire unit. The most significant issue discovered during maintenance was the severe coking of the packing in the fourth vacuum line (BED5) and the fifth vacuum line (BED6 overvaporization section), despite their relatively short service life. Furthermore, the oil collecting tank and the air riser below the packing were clogged with coke, resulting in low system efficiency and stability. Utility Model Content

[0004] In view of the deficiencies of the prior art, the utility model provides an anti-clogging structure for removing particles in the ascending gas of a slurry bed vacuum tower, solving the problems of coking and clogging of packing in the existing slurry bed vacuum tower.

[0005] To achieve the above objectives, the present invention is implemented through the following technical solutions: an anti-blocking structure for removing particles in the rising gas of a slurry bed vacuum tower, comprising a tower body, six packings are arranged inside the tower body, and the six packings are BED1, BED2, BED3, BED4, BED5 and BED6 from top to bottom, the six packings are arranged longitudinally at intervals in sequence, the tops of the six packings are all provided with packing pressure rings, and the bottoms of the six packings are all provided with packing supports and truss beams, the BED1, BED2, BED3, BED4 and BED5 are structured packings, the BED6 is a two-layer vertical grid packing. A spray distributor 1 and a spray distributor 2 are arranged in sequence from top to bottom inside the tower body. The grid packing is arranged 2m below the spray distributor 1 and the spray distributor 2. A herringbone baffle assembly is provided at the bottom of the grid packing. An oil collecting tank 1 is provided above the inside of the tower body. Spray liquid distributors are arranged at intervals above BED1, BED2, BED3, BED4 and BED5. A feed distributor is provided below BED5. A stripping steam distribution pipe and a quenching oil distribution pipe are provided below the herringbone baffle assembly.

[0006] Preferably, the herringbone baffle assembly includes a plurality of herringbone baffles 1, the exteriors of the plurality of herringbone baffles 1 are arranged inside the tower body, the inner wall of the tower body is provided with a plurality of herringbone baffles 2, liquid collection and redistribution rings are provided above the plurality of herringbone baffles 1 and herringbone baffles 2, the plurality of herringbone baffles 1 and herringbone baffles 2 are divided into multiple layers, the herringbone baffles 1 and herringbone baffles 2 in each layer are evenly spaced and arranged in parallel, and an overflow weir is vertically fixed on the top surface of the herringbone baffle 1 in the top layer near the end where the liquid flows down.

[0007] Preferably, a cone-section liquid collecting device is provided on the top of the liquid collecting and redistributing ring, and a single tangential annular flow feed distributor is provided between the cone-section liquid collecting device and the overflow weir.

[0008] Preferably, the oil collecting tank includes an unequal height air lift cylinder, a liquid collecting channel, and an air riser. The outer wall of the unequal height air lift cylinder is arranged inside the tower body. Two extraction buckets are symmetrically arranged at the bottom of the unequal height air lift cylinder. The bottom plates of the two extraction buckets are inclined toward the extraction outlet. The two ends of the two liquid collecting channels are respectively connected to the two extraction buckets. The two liquid collecting channels are inclined toward the extraction buckets. A plurality of liquid collecting tanks are arranged inside the unequal height air lift cylinder. The plurality of liquid collecting tanks are arranged in parallel and at intervals, and a section of the liquid collecting tank close to the tower wall is connected to the tower wall. The connection A liquid collecting trough support ring is provided, and the other end of the liquid collecting trough close to the tower wall is connected to the top of the liquid collecting channel, and the end connected to the tower wall is higher, and the end connected to the liquid collecting channel is lower. The middle part of the middle liquid collecting trough bulges upward, and the two ends of the middle liquid collecting trough are respectively connected to the two adjacent liquid collecting channels and inclined toward the two liquid collecting channels. Multiple risers are arranged in an interspersed manner and fixed between the two liquid collecting channels. A liquid baffle is arranged above each riser, and a liquid collecting ring is fixed on the tower wall above the liquid baffle. The outside of the riser is connected to a riser blocking plate.

[0009] Preferably, the plurality of air risers are divided into two types, long and short, and extraction bucket support rings are provided at the edges of the two extraction buckets.

[0010] Preferably, the spray-type liquid distributor includes multiple liquid distribution pipes, which are arranged in sequence inside the tower body from top to bottom. A trough-type liquid distributor is arranged below the topmost liquid distribution pipe, and spray-type liquid distribution pipes are arranged below the remaining liquid distribution pipes.

[0011] Preferably, an oil collecting tank 2 is provided between BED2 and BED3, an oil collecting tank 3 is provided between BED3 and BED4, and an oil collecting tank 4 is provided between BED5 and BED6.

[0012] The utility model provides an anti-clogging structure for removing particles from rising gas in a slurry bed vacuum tower. It has the following beneficial effects:

[0013] 1. The utility model changes the traditional four-line oil collecting tank into a design with unequal height air cylinders that are inclined toward the extraction port. When the extraction port is blocked, the liquid accumulates to the height of the low air cylinder and overflows from the low air cylinder, leaving the high air cylinder to go to the gas phase. The gas-liquid diversion function of the oil collecting tank is still retained, and the entrainment and blockage of the air cylinder caused by the gas and liquid flowing to the same place are avoided. Furthermore, after a period of operation, the increase in pressure drop can be avoided and the separation effect can be maintained, thereby avoiding the occurrence of coking and blockage.

[0014] 2. The utility model divides the washing oil feed port into two, adopts a double-layer spray structure, and sets two layers of vertical grids about 2m below the nozzle, so as to adjust the spray liquid and spray angle of the nozzle, so that the liquid passes through the grid after falling to a certain height, preventing excessive liquid from flowing down the tower wall after a certain height due to the conical spray angle, thereby reducing the efficiency of gas-liquid contact. In addition, only two layers of grids are set, which has the effect of not being easily blocked, thereby changing the liquid flow characteristics, increasing gas-liquid contact, avoiding the formation of blockage and increasing pressure drop, increasing the vacuum load of the whole tower and the wax oil extraction rate, and extending the maintenance cycle. In the study of the washing effect of the spray pipe, according to the sedimentation formula The critical particle size dp at the current gas velocity is calculated and determined, so that the appropriate nozzle is selected to distribute the scrubbing oil to meet the requirements of the scrubbing oil to capture the particles in the rising gas phase and avoid entrainment.

[0015] 3. The utility model increases the mass transfer effect of the herringbone baffle group so that the liquid can be distributed to each herringbone baffle, and adds an annular collecting device with a vertical notch opened at the position corresponding to each herringbone baffle. At the same time, an overflow weir is set above the first-layer herringbone baffle, so that the liquid can be distributed to each herringbone baffle and overflow evenly. It can make all the liquids steam-stripped under the action of the herringbone baffle, thereby increasing the mass transfer effect and improving the wax oil extraction rate. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a plan view of the vacuum tower of the utility model;

[0017] Figure 2 This is a structural diagram of the oil collecting tank 1 of the utility model;

[0018] Figure 3 This is a schematic diagram of the internal structure of the utility model unequal height lift air cylinder;

[0019] Figure 4 This is a top view of the internal structure of the unequal height lift cylinder of the present invention;

[0020] Figure 5 This is a schematic diagram of the structure of the grille of the utility model;

[0021] Figure 6 for Figure 1 Enlarged view of point A in the middle;

[0022] Figure 7 for Figure 1 Enlarged view of point B in the middle;

[0023] Figure 8 for Figure 1 Enlarged view of point C in the middle.

[0024] Among them, 1. Liquid distribution pipe; 2. Trough liquid distributor; 3. Packing pressure ring; 4. Tower body; 5. Packing support; 6. Truss beam; 7. Oil collecting tank 1; 8. Spray liquid distribution pipe; 9. Extraction bucket; 10. Liquid collection and redistribution ring; 11. Oil collecting tank 2; 12. Grid packing; 13. Oil collecting tank 3; 14. Riser; 15. Variable height lift cylinder; 16. Oil collecting tank 4; 17. Feed distributor; 18. Spray Type distributor 1; 19. Spray type distributor 2; 20. Overflow weir; 21. Single tangential circulation feed distributor; 22. Conical liquid collection device; 23. Herringbone baffle 1; 24. Herringbone baffle 2; 25. Stripping steam distribution pipe; 26. Quenching oil distribution pipe; 27. Liquid collecting ring; 28. Riser plugging plate; 29. ​​Liquid baffle; 30. Liquid collecting trough; 31. Liquid collecting trough support ring; 32. Liquid collecting channel; 33. Extraction bucket support ring. DETAILED DESCRIPTION

[0025] The following will be combined with the accompanying drawings of the present invention to clearly and completely describe the technical solution of the present invention. Obviously, the embodiments described are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0026] Example:

[0027] Please see the attached Figure 1 , Attachment Figure 2 , Attachment Figure 5 and attached Figure 6 The embodiment of the utility model provides an anti-blocking structure for removing particles in the rising gas of a slurry bed vacuum tower, comprising a tower body 4, six packings are arranged inside the tower body 4, and the six packings are BED1, BED2, BED3, BED4, BED5 and BED6 from top to bottom. The six packings are arranged longitudinally at intervals in sequence, and the tops of the six packings are all provided with a packing pressure ring 3, and the bottoms of the six packings are all provided with a packing support 5 and a truss beam 6. BED1, BED2, BED3, BED4 and BED5 are structured packings, and BED6 is a two-layer vertical grid packing 12. A spray distributor 18 and a spray distributor 2 19 are arranged in sequence from top to bottom inside the tower body 4. A grid filler 12 is arranged 2m below the spray distributor 18 and the spray distributor 2 19. A herringbone baffle assembly is provided at the bottom of the grid filler 12. An oil collecting tank 17 is provided above the tower body 4. Spray liquid distributors are arranged at intervals above BED1, BED2, BED3, BED4 and BED5. A feed distributor 17 is provided below BED5. A stripping steam distribution pipe 25 and a quenching oil distribution pipe 26 are provided below the herringbone baffle assembly.

[0028] Specifically, when the tower body 4 is working, the raw gas enters the bottom of the tower body 4 and passes through the packing layers BED1, BED2, BED3, BED4, BED5 and BED6 in sequence. In the packing layer, the particulate matter in the gas will contact the packing surface, and mass transfer and separation processes will occur. At the same time, the spray distributor 18 and the spray distributor 2 19 will spray liquid to the packing layer to ensure the wetting and separation effect of the packing layer. After being processed by the packing layer, the particulate matter in the gas will be separated and move upward, and finally discharged through the top of the tower body 4. In this process, the herringbone baffle assembly set at the bottom of the grid packing 12 helps to prevent particle blockage and ensure smooth gas flow. At the same time, under the action of the oil collecting tank 7 set above the interior of the tower body 4, the liquid product condensed in the gas can be collected, and under the action of the stripping steam distribution pipe 25 and the quenching oil distribution pipe 26, the liquid product and waste gas are processed. The structural characteristics of the grid packing 12 make it less susceptible to clogging. This improves liquid flow characteristics, increases gas-liquid contact, and avoids clogging and increased pressure drop. This increases the tower's vacuum recovery and wax and oil extraction rates, while also extending maintenance cycles. The vertical grid packing 12 is 200 meters high inside the tower body 4.

[0029] Please see the attached Figure 7 The herringbone baffle assembly includes a plurality of herringbone baffles 23, the exterior of the plurality of herringbone baffles 23 is arranged inside the tower body 4, the inner wall of the tower body 4 is provided with a plurality of herringbone baffles 24, a liquid collection and redistribution ring 10 is provided above the plurality of herringbone baffles 23 and the herringbone baffles 24, the plurality of herringbone baffles 23 and the herringbone baffles 24 are divided into multiple layers, the herringbone baffles 23 and the herringbone baffles 24 of each layer are evenly spaced and arranged in parallel, and an overflow weir 20 is vertically fixed on the top surface of the top herringbone baffle 23 near the end where the liquid flows down.

[0030] Specifically, in the removal slurry bed pressure reducing tower, after the gas and liquid are processed by the packing layer, the particulate matter in the gas will be separated and move upward, and the liquid will be collected in the oil collecting tank at the bottom of the packing layer and below the herringbone baffle assembly. The setting of herringbone baffle 1 23 and herringbone baffle 2 24 can help to further improve the gas-liquid separation effect. These baffles can effectively guide the gas flow and prevent the blockage of particulate matter through layered setting and interval arrangement. At the same time, the liquid collection and redistribution ring 10 arranged above the herringbone baffle 1 23 and the herringbone baffle 2 24 can collect and redistribute the liquid, which helps to ensure the uniform distribution of the liquid in the packing layer and improve the separation effect. At the same time, the setting of the overflow weir 20 can control the flow and distribution of the liquid, prevent excessive overflow or uneven flow of the liquid, and ensure stable operation of the system. The liquid collection and redistribution ring 10 features vertical slots corresponding to each herringbone baffle. The size of the slots is calculated based on the flow rate and the weir length of the herringbone baffles to distribute the liquid. This structure allows all liquid to be steam stripped through the herringbone baffles, effectively enhancing mass transfer and improving the wax extraction rate. The diameter of the herringbone baffles 1 and 2 is 6000 mm, with a spacing of 1200 mm.

[0031] Please see the attached Figure 7 A cone-section liquid collecting device 22 is provided on the top of the liquid collecting and redistributing ring 10 , and a single tangential annular flow feed distributor 21 is provided between the cone-section liquid collecting device 22 and the overflow weir 20 .

[0032] Specifically, the liquid collection and redistribution ring 10 is mainly used to collect liquid collected from the packing layer and ensure that the liquid is evenly distributed throughout the ring, while the design of the cone-section liquid collection device 22 at the top helps to guide the liquid to flow downward and concentrate it in the overflow weir 20 below. The single tangential circulation feed distributor 21 arranged between the cone-section liquid collection device 22 and the overflow weir 20 can be used to introduce new liquid feed into the liquid collection and redistribution ring 10, which helps to maintain the circulation flow of the liquid and ensure that the liquid is evenly distributed throughout the system.

[0033] Please see the attached Figure 3 -Attached Figure 4The oil collecting tank 7 includes an unequal height air cylinder 15, a liquid collecting channel 32, and an air riser 14. The outer wall of the unequal height air cylinder 15 is arranged inside the tower body 4. Two extraction buckets 9 are symmetrically arranged at the bottom of the unequal height air cylinder 15. The bottom plates of the two extraction buckets 9 are inclined toward the extraction outlet. The two ends of the two liquid collecting channels 32 are connected to the two extraction buckets 9 respectively. The two liquid collecting channels 32 are inclined toward the extraction bucket 9. A plurality of liquid collecting tanks 30 are arranged inside the unequal height air cylinder 15. The plurality of liquid collecting tanks 30 are arranged in parallel and spaced apart, and a section of the liquid collecting tank 30 close to the tower wall is connected to the tower wall. A liquid collecting tank is provided at the connection. The trough support ring 31 has a section of liquid collecting trough 30 near the tower wall, and the other end is connected to the top of the liquid collecting channel 32, and the end connected to the tower wall is higher, and the end connected to the liquid collecting channel 32 is lower. The middle part of the middle liquid collecting trough 30 bulges upward, and the two ends of the middle liquid collecting trough 30 are respectively connected to the two adjacent liquid collecting channels 32 and inclined toward the two liquid collecting channels 32. Multiple riser pipes 14 are interspersed and fixed between the two liquid collecting channels 32. Liquid baffles 29 are arranged at intervals above each riser pipe 14, and liquid collecting rings 27 are fixed at intervals on the tower wall above the liquid baffles 29. The outside of the riser pipe 14 is connected to a riser pipe blocking plate 28.

[0034] Specifically, the bottom plate of the extraction bucket 9 is inclined toward the extraction port, which helps to guide the liquid to flow toward the liquid collection channel 32, and the liquid collection channel 32 is inclined toward the extraction bucket 9, and is used to collect the liquid discharged from the unequal height air lift cylinder 15. Multiple liquid collection tanks 30 are arranged in parallel and spaced apart, and the liquid collection tanks 30 are connected to the liquid collection channel 32 to help guide the liquid into the liquid collection channel 32. Multiple air lift pipes 14 are used to introduce gas to help promote the liquid to rise from the unequal height air lift cylinder 15. At the same time, the liquid baffle 29 can be used to prevent the liquid from flowing directly upward, and cooperate with the liquid collection ring 27 to help collect and disperse the liquid. Under the action of the air lift pipe 14 blocking plate, the flow of gas and liquid is controlled to ensure stable operation of the system. The oil collecting tank 7 adopts a trough structure, and each liquid collecting tank 30 is inclined toward the middle liquid collecting channel 32, and the bottom plate of the liquid collecting channel 32 is inclined toward the extraction buckets 9 on both sides, so that the liquid can flow quickly to the extraction outlet, reducing the residence time in the oil collecting tank 7 and avoiding coking. The space between the two liquid collecting tanks 30 forms a gas phase space, which is used as a lift cylinder, and the height difference between adjacent lift cylinders is 300mm, which are 900mm and 1200mm respectively, further optimizing the coking and blockage of the gas phase space.

[0035] The plurality of air risers 14 are divided into two types, long and short. The edges of the two extraction buckets 9 are provided with extraction bucket support rings 33 .

[0036] Specifically, the combination of the long and short risers 14 can help optimize the gas-liquid separation process and improve efficiency. The extraction bucket support ring 33 is mainly used to reinforce and support the structure of the extraction bucket 9 to ensure its stability and reliability.

[0037] Please see the attached Figure 1The spray-type liquid distributor includes multiple liquid distribution pipes 1, which are arranged in sequence from top to bottom inside the tower body 4. A trough-type liquid distributor 2 is arranged below the top liquid distribution pipe 1, and spray-type liquid distribution pipes 8 are arranged below the remaining liquid distribution pipes 1.

[0038] Specifically, the trough-type liquid distributor 2 is used to collect and evenly distribute the liquid from the top liquid distribution pipe 1, ensuring that the liquid flows evenly downward. At the same time, the spray-type liquid distribution pipe 8 is used to spray and distribute the liquid to the area below, ensuring the uniform distribution of the liquid in the entire tower body 4, thereby improving the liquid treatment effect and product quality.

[0039] An oil collecting tank 2 11 is provided between BED2 and BED3 , an oil collecting tank 3 13 is provided between BED3 and BED4 , and an oil collecting tank 4 16 is provided between BED5 and BED6 .

[0040] Working principle: The bottom of the tank of the oil collecting tank is tilted toward the extraction outlet, so that the liquid in the oil collecting tank is prevented from accumulating at the bottom. Under the action of the tilt, the liquid flows toward the extraction outlet. When the extraction outlet is blocked, the unequal height air cylinders can overflow from the lower air cylinder when the liquid accumulates to the height of the lower air cylinder, and the higher air cylinder can be retained to go to the gas phase. This can still retain the gas-liquid diversion function of the oil collecting tank, avoid the situation where the gas and liquid go to the same place and cause entrainment and blockage of the air cylinder, and can avoid the increase of pressure drop and maintain the separation effect after running for a period of time. At the same time, in the BED6 section, the liquid spray The density is small, which easily leads to uneven spraying, resulting in the BED6 section packing being extremely easy to be blocked. Therefore, the tower body divides the washing oil feed port into two, adopts a double-layer spray structure, and sets two layers of vertical grid packing about 2m below the nozzle. The spray liquid and spray angle of the nozzle are used for trimming, so that the liquid passes through the grid packing after falling to a certain height. Under the action of the two layers of grid packing, the liquid flow characteristics are changed to increase the gas-liquid contact, and the blockage and pressure drop are avoided. The vacuum load of the whole tower and the wax oil extraction rate are increased, and the maintenance cycle is extended. According to the sedimentation formula, the washing effect of the spray pipe is studied. The critical particle size dp at the current gas velocity is calculated and determined, allowing the appropriate nozzle to be selected for distribution of the scrubbing oil to ensure that the scrubbing oil captures particles in the rising gas phase and avoids entrainment. As the liquid flows down the tower wall driven by the gas phase, a ring-shaped collection device is used. Vertical notches can be opened at the position corresponding to the herringbone baffles, and an overflow weir is set above the first-layer herringbone baffles. This allows the liquid to be distributed to each herringbone baffle and overflow evenly. At the same time, this structure allows all liquid to be steam stripped by the herringbone baffles, increasing mass transfer efficiency and improving the wax and oil extraction rate.

[0041] Although the embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations may be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An anti-clogging structure for removing particles from rising gas in a slurry bed vacuum tower, comprising a tower body (4), characterized in that: Six packings are arranged inside the tower body (4), and the six packings are BED1, BED2, BED3, BED4, BED5 and BED6 from top to bottom. The six packings are arranged longitudinally at intervals in sequence. The tops of the six packings are all provided with packing pressing rings (3), and the bottoms of the six packings are all provided with packing supports (5) and truss beams (6). The BED1, BED2, BED3, BED4 and BED5 are structured packings, and the BED6 is a two-layer vertical grid packing (12). The lower part of the tower body (4) is provided with spray-type distribution packings from top to bottom. The tower body (4) is provided with an oil collecting tank (7) on the top of the tower body (4), spray type liquid distributors are arranged at intervals above BED1, BED2, BED3, BED4 and BED5, a feed distributor (17) is arranged below BED5, and a stripping steam distribution pipe (25) and a quenching oil distribution pipe (26) are arranged below the herringbone baffle assembly.

2. The anti-clogging structure for removing particles from ascending gas in a slurry bed vacuum tower according to claim 1, characterized in that: The herringbone baffle assembly includes a plurality of herringbone baffles (23), the exteriors of the plurality of herringbone baffles (23) are arranged inside the tower body (4), the inner wall of the tower body (4) is provided with a plurality of herringbone baffles (24), a liquid collecting and redistributing ring (10) is provided above the plurality of herringbone baffles (23) and the herringbone baffles (24), the plurality of herringbone baffles (23) and the herringbone baffles (24) are divided into multiple layers, the herringbone baffles (23) and the herringbone baffles (24) of each layer are evenly spaced and arranged in parallel, and an overflow weir (20) is vertically fixed on the top surface of the herringbone baffle (23) of the top layer near the end where the liquid flows down.

3. The anti-clogging structure for removing particles from ascending gas in a slurry bed vacuum tower according to claim 2, characterized in that: A cone-section liquid collecting device (22) is provided on the top of the liquid collecting and redistributing ring (10), and a single tangential annular flow feed distributor (21) is provided between the cone-section liquid collecting device (22) and the overflow weir (20).

4. The anti-clogging structure for removing particles from ascending gas in a slurry bed vacuum tower according to claim 1, characterized in that: The oil collecting tank (7) comprises an unequal height air-lift cylinder (15), a liquid collecting channel (32), and an air-lift pipe (14). The outer wall of the unequal height air-lift cylinder (15) is arranged inside the tower body (4). Two extraction buckets (9) are symmetrically arranged at the bottom of the unequal height air-lift cylinder (15). The bottom plates of the two extraction buckets (9) are inclined toward the extraction outlet. The two ends of the two liquid collecting channels (32) are respectively connected to the two extraction buckets (9). The two liquid collecting channels (32) are inclined toward the extraction buckets (9). A plurality of liquid collecting troughs (30) are arranged inside the unequal height air-lift cylinder (15). The plurality of liquid collecting troughs (30) are arranged in parallel and spaced apart. A section of the liquid collecting trough (30) close to the tower wall is connected to the tower wall. The connection is provided with A liquid collecting trough support ring (31) is provided. The other end of the liquid collecting trough (30) near the tower wall is connected to the top of the liquid collecting channel (32), and the end connected to the tower wall is higher, and the end connected to the liquid collecting channel (32) is lower. The middle part of the liquid collecting trough (30) in the middle is raised upward, and the two ends of the liquid collecting trough (30) in the middle are respectively connected to two adjacent liquid collecting channels (32) and inclined toward the two liquid collecting channels (32). A plurality of the riser pipes (14) are arranged in an interlaced manner and fixed between the two liquid collecting channels (32). A liquid baffle plate (29) is arranged above each of the riser pipes (14). A liquid collecting ring (27) is fixed on the tower wall above the liquid baffle plate (29). The outside of the riser pipe (14) is connected to a riser pipe blocking plate (28).

5. The anti-clogging structure for removing particles from ascending gas in a slurry bed vacuum tower according to claim 4, characterized in that: The plurality of air risers (14) are divided into two types, long and short. The edges of the two extraction buckets (9) are provided with extraction bucket support rings (33).

6. The anti-clogging structure for removing particles from ascending gas in a slurry bed vacuum tower according to claim 1, characterized in that: The spray-type liquid distributor comprises a plurality of liquid distribution pipes (1), which are sequentially arranged inside a tower body (4) from top to bottom. A trough-type liquid distributor (2) is arranged below the topmost liquid distribution pipe (1), and spray-type liquid distribution pipes (8) are arranged below the remaining liquid distribution pipes (1).

7. The anti-clogging structure for removing particles from ascending gas in a slurry bed vacuum tower according to claim 1, characterized in that: An oil collecting tank 2 (11) is provided between BED2 and BED3, an oil collecting tank 3 (13) is provided between BED3 and BED4, and an oil collecting tank 4 (16) is provided between BED5 and BED6.

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