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

Abstract

The invention relates to the technical field of slurry bed vacuum towers, and discloses an anti-clogging structure for removing particles in ascending gas of a slurry bed vacuum tower, the anti-clogging structure 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 invention 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] The deslurry bed vacuum tower is an important equipment used in petrochemical processes to remove impurities from raw materials and extract target products. This equipment usually includes the following main components and functions: packing layer, feed inlet, decompression device, gas outlet, liquid collector, bottom liquid collector and control system. The packing layer is the core component of the deslurry bed vacuum tower, which is used to increase the surface area, promote gas-liquid contact, and achieve effective separation and mass transfer. Its type and layout are crucial to the performance of the equipment.

[0003] At present, most of the slurry bed vacuum towers are currently in actual use, and their actual crude oil processing load is currently between 77% and 85%. According to the feedback from the vacuum tower operation, there are problems such as the vacuum tower load has reached the upper limit, the operating parameters deviate greatly from the design, and the reduction line 4 has already carried slurry heavy components, which limits the processing capacity of the entire device. Among them, the biggest problem found during the overhaul process is that the packing of the reduction line 4 (BED5) and the reduction line 5 (BED6 over-vaporization section) is seriously coked after a short period of use, and the oil collection box below the packing and the air riser are blocked with coking materials, resulting in low system efficiency and stability. Summary of the invention

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

[0005] To achieve the above purpose, the present invention is implemented by the following technical scheme: an anti-blocking structure for removing particles in the ascending gas of a slurry bed vacuum tower, comprising a tower body, six fillers are arranged inside the tower body, and the six fillers are BED1, BED2, BED3, BED4, BED5 and BED6 from top to bottom, the six fillers are arranged longitudinally at intervals in sequence, the tops of the six fillers are all provided with filler pressure rings, the bottoms of the six fillers are all provided with filler supports and truss beams, the BED1, BED2, BED3, BED4 and BED5 are structured packings, the BED6 ED6 is a two-layer vertical grid filler. A spray distributor 1 and a spray distributor 2 are arranged in sequence from top to bottom inside the lower part of the tower body. The grid filler is arranged 2m below the spray distributor 1 and the spray distributor 2. A herringbone baffle assembly is arranged at the bottom of the grid filler. An oil collecting tank 1 is arranged above the inner part of the tower body. Spray liquid distributors are arranged at intervals above BED1, BED2, BED3, BED4 and BED5. A feed distributor is arranged below BED5. A stripping steam distribution pipe and a quench oil distribution pipe are arranged 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 1 includes an unequal height air cylinder, a liquid collecting channel, and an air riser. The outer wall of the unequal height air cylinder is arranged inside the tower body. Two extraction buckets are symmetrically arranged at the bottom of the unequal height air 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 cylinder. The plurality of liquid collecting tanks are arranged in parallel and at intervals. 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 arranged at the place, and the other end of the liquid collecting trough close to a section of 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 two adjacent liquid collecting channels and inclined toward the two liquid collecting channels. A plurality of riser pipes are arranged in an interspersed manner and fixed between the two liquid collecting channels, and a liquid baffle plate is arranged above each riser pipe at intervals, and a liquid collecting ring is fixed on the tower wall above the liquid baffle plate at intervals, and a riser pipe blocking plate is connected to the outside of the riser pipe.

[0009] Preferably, the plurality of riser pipes 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 comprises a plurality of liquid distribution pipes, which are sequentially arranged 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 arranged between BED2 and BED3, an oil collecting tank 3 is arranged between BED3 and BED4, and an oil collecting tank 4 is arranged between BED5 and BED6.

[0012] Working principle: The bottom of the tank of the oil collecting tank is tilted toward the outlet to prevent the liquid in the oil collecting tank from accumulating at the bottom. The liquid flows toward the outlet under the tilting effect. When the outlet is blocked, the liquid overflows from the lower lift cylinder when the liquid accumulates to the height of the lower lift cylinder. The higher lift cylinder can be used for gas phase. The gas-liquid diversion function of the oil collecting tank is still retained to avoid entrainment and blockage of the lift cylinder caused by gas and liquid flowing to the same place. The pressure drop can be avoided and the separation effect can be maintained after a period of operation. At the same time, in the BED6 section, liquid spraying The density is small, and it is easy to form uneven spraying, which makes the BED6 section packing very easy to be blocked. Therefore, the tower body divides the washing oil feed inlet into two parts. By adopting a double-layer spray structure, two layers of vertical grid packing are set 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 and wax oil extraction rate of the whole tower 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, so that the appropriate nozzle is selected to distribute the washing oil to meet the capture of particles in the rising gas phase by the washing oil and avoid entrainment. When the liquid flows down the tower wall driven by the gas phase, a vertical notch can be opened at each position corresponding to the herringbone baffle through the annular collection device, and 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. At the same time, under the action of this structure, all liquids can be steam stripped under the action of the herringbone baffle, increasing the mass transfer effect and the wax oil extraction rate.

[0013] The present invention provides an anti-blocking structure for removing particles from rising gas in a slurry bed vacuum tower. It has the following beneficial effects:

[0014] 1. The present invention changes the traditional four-line oil collecting tank into a design with unequal height air cylinders inclined toward the extraction port, so that when the extraction port is blocked, the liquid accumulates to the height of the low air cylinder and overflows from the low air cylinder, and the high air cylinder is retained to go to the gas phase, thereby still retaining the gas-liquid diversion function of the oil collecting tank, avoiding the situation where gas and liquid go to the same place to cause entrainment and blockage of the air cylinder, and further avoiding the increase of pressure drop and maintaining the separation effect after a period of operation, thereby avoiding the occurrence of coking blockage.

[0015] 2. The present invention divides the washing oil feed port into two parts, 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 the gas-liquid contact, avoiding the formation of blockage and increasing the pressure drop, increasing the vacuum load and wax oil extraction rate of the whole tower, 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.

[0016] 3. The present invention 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, a vertical notch is opened at the position corresponding to each herringbone baffle, and an overflow weir is arranged above the first-layer herringbone baffle, so that the liquid can be distributed to each herringbone baffle and overflow evenly, and all the liquid can be 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

[0017] Figure 1 It is a plan view of the vacuum tower of the present invention;

[0018] Figure 2 It is a structural schematic diagram of an oil collecting tank 1 of the present invention;

[0019] Figure 3 It is a schematic diagram of the internal structure of the unequal height lift air cylinder of the present invention;

[0020] Figure 4 It is a top view schematic diagram of the internal structure of the unequal height lift air cylinder of the present invention;

[0021] Figure 5 is a schematic structural diagram of the grille of the present invention;

[0022] Figure 6 for Figure 1 Enlarged view of point A in the middle;

[0023] Figure 7 for Figure 1 Enlarged view of point B in the middle;

[0024] Figure 8 for Figure 1 Enlarged view of center C.

[0025] 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 box 1; 8. Spraying liquid distribution pipe; 9. Extraction bucket; 10. Liquid collection and redistribution ring; 11. Oil collecting box 2; 12. Grid packing; 13. Oil collecting box 3; 14. Riser; 15. Variable height lift cylinder; 16. Oil collecting box 4; 17. Feed distributor; 18. Spray 1. Spray distributor 1; 19. Spray distributor 2; 20. Overflow weir; 21. Single tangential circulation feed distributor; 22. Cone liquid collecting 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 plate; 30. Liquid collecting tank; 31. Liquid collecting tank support ring; 32. Liquid collecting channel; 33. Extraction bucket support ring. DETAILED DESCRIPTION

[0026] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0027] Example:

[0028] Please refer to the attached Figure 1 , Attachment Figure 2 , Attachment Figure 5 and attached Figure 6 The embodiment of the present invention provides an anti-blocking structure for removing particles in the ascending gas of a slurry bed vacuum tower, comprising a tower body 4, six fillers are arranged inside the tower body 4, and the six fillers are BED1, BED2, BED3, BED4, BED5 and BED6 from top to bottom, and the six fillers are arranged longitudinally at intervals in sequence, and the tops of the six fillers are all provided with a filler pressing ring 3, and the bottoms of the six fillers are all provided with a filler support 5 and a truss beam 6, BED1, BED2, BED3, BED4 and BED5 are regular fillers, BED6 is a two-layer vertical grid filler 12, and the tower body A spray distributor 18 and a spray distributor 2 19 are arranged in sequence from top to bottom inside 4, a grid filler 12 is arranged 2m below the spray distributor 18 and the spray distributor 2 19, a herringbone baffle assembly is arranged at the bottom of the grid filler 12, an oil collecting tank 7 is arranged above the inside of the tower body 4, spray 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.

[0029] 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. Furthermore, due to the structural characteristics of the grid filler 12, it is not easy to get clogged, and can change the liquid flow characteristics to increase the gas-liquid contact and avoid the formation of blockage to increase the pressure drop, increase the vacuum compound and wax oil extraction rate of the whole tower, and have the effect of extending the maintenance cycle. The vertical grid filler 12 is 200 meters high inside the tower body 4.

[0030] Please refer to 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 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 top layer of herringbone baffles 23 near the end where the liquid flows down.

[0031] 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 box at the bottom of the packing layer and below the herringbone baffle assembly, wherein the setting of the herringbone baffle 1 23 and the herringbone baffle 2 24 can help to further improve the gas-liquid separation effect, and 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 collecting and redistributing ring 10 has a vertical notch at the position corresponding to each herringbone baffle, and the opening size can be calculated according to the flow rate and the weir length of the herringbone baffle to distribute the liquid volume. Through the arrangement of the above structure, all liquids can be steam stripped under the action of the herringbone baffle, effectively increasing the mass transfer effect and improving the wax oil extraction rate. The diameter of the herringbone baffle 1 23 and the herringbone baffle 2 24 is Φ6000mm, and the plate spacing is 1200mm.

[0032] Please refer to the attached Figure 7 A conical liquid collecting device 22 is arranged on the top of the liquid collecting and redistributing ring 10 , and a single tangential annular flow feed distributor 21 is arranged between the conical liquid collecting device 22 and the overflow weir 20 .

[0033] Specifically, the liquid collecting and redistributing 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 collecting 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 collecting device 22 and the overflow weir 20 can be used to introduce new liquid feed into the liquid collecting and redistributing ring 10, which helps to maintain the circulation flow of the liquid and ensure that the liquid is evenly distributed throughout the system.

[0034] Please refer to the attached Figure 3 -Attached Figure 4The oil collecting tank 7 includes an unequal height gas cylinder 15, a liquid collecting channel 32, and a gas riser 14. The outer wall of the unequal height gas cylinder 15 is arranged inside the tower body 4. Two extraction buckets 9 are symmetrically arranged at the bottom of the unequal height gas 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 tanks 30 are arranged inside the unequal height gas cylinder 15. The plurality of liquid collecting tanks 30 are arranged in parallel and spaced apart. A section of the liquid collecting tank 30 close to the tower wall is connected to the tower wall. A liquid collecting tank 30 is arranged at the connection. A trough support ring 31, the other end of a section of the liquid collecting trough 30 close to the tower wall is connected to the top of the liquid collecting channel 32, and the end connected to the tower wall is high, and the end connected to the liquid collecting channel 32 is low, 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 two adjacent liquid collecting channels 32 and inclined toward the two liquid collecting channels 32, a plurality of riser pipes 14 are interspersed and arranged and fixed between the two liquid collecting channels 32, a liquid baffle plate 29 is arranged at intervals above each riser pipe 14, a liquid collecting ring 27 is fixed at intervals on the tower wall above the liquid baffle plate 29, and a riser pipe plugging plate 28 is connected to the outside of the riser pipe 14.

[0035] 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 collecting channel 32, and the liquid collecting channel 32 is inclined toward the extraction bucket 9, and is used to collect the liquid discharged from the unequal height lift cylinders 15. A plurality of liquid collecting troughs 30 are arranged in parallel and spaced apart, and the liquid collecting troughs 30 are connected to the liquid collecting channel 32 to help guide the liquid into the liquid collecting channel 32. A plurality of lift pipes 14 are used to introduce gas to help promote the liquid to rise from the unequal height lift cylinders 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 collecting ring 27 to help collect and disperse the liquid. Under the action of the lift pipe 14 blocking plate, the flow of gas and liquid is controlled to ensure stable operation of the system. The oil collecting box 7 adopts a trough structure, each collecting tank 30 is inclined toward the middle collecting channel 32, and the bottom plate of the collecting channel 32 is inclined toward the extraction buckets 9 on both sides, so that the liquid can quickly flow to the extraction outlet, reducing the retention time in the oil collecting box 7 and avoiding coking. The vacancy between the two collecting tanks 30 forms a gas phase space, which is used as a gas lift, and the height difference between adjacent gas lifts is 300mm, which are 900mm and 1200mm respectively, further optimizing the coking and blockage of the gas phase space.

[0036] The plurality of riser pipes 14 are divided into two types, long and short, and extraction bucket support rings 33 are arranged at the edges of the two extraction buckets 9 .

[0037] 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.

[0038] Please refer to the attached Figure 1The spray-type liquid distributor includes a plurality of liquid distribution pipes 1, which are sequentially arranged inside the 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.

[0039] Specifically, the trough-type liquid distributor 2 is used to collect and evenly distribute the liquid from the top liquid distribution pipe 1 to ensure 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 to ensure the uniform distribution of the liquid in the entire tower body 4, thereby improving the liquid treatment effect and product quality.

[0040] An oil collecting tank 2 11 is arranged between BED2 and BED3 , an oil collecting tank 3 13 is arranged between BED3 and BED4 , and an oil collecting tank 4 16 is arranged between BED5 and BED6 .

[0041] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that 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 ascending 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, and the six packings are arranged longitudinally 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). BED1, BED2, BED3, BED4 and BED5 are structured packings, and BED6 is a two-layer vertical grid packing (12). The lower part of the tower body (4) is provided with spray distribution in sequence from top to bottom. The tower body (4) is provided with an oil collecting tank (7) on the top of each of BED1, BED2, BED3, BED4 and BED5. A feed distributor (17) is provided on the bottom of each of BED5. A stripping steam distribution pipe (25) and a quenching oil distribution pipe (26) are provided on the bottom of each of BED1, BED2, BED3, BED4 and BED5.

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 comprises a plurality of herringbone baffles (23), the exterior of the plurality of herringbone baffles (23) being arranged inside a tower body (4), the inner wall of the tower body (4) being provided with a plurality of herringbone baffles (24), a liquid collecting and redistributing ring (10) being provided above the plurality of herringbone baffles (23) and the herringbone baffles (24), the plurality of herringbone baffles (23) and the herringbone baffles (24) being divided into multiple layers, the herringbone baffles (23) and the herringbone baffles (24) of each layer being evenly spaced and arranged in parallel, and an overflow weir (20) being vertically fixedly provided on the top surface of the herringbone baffle (23) of the top layer close to the end where the liquid flows down.

3. The anti-blocking 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 arranged at the top of the liquid collecting and redistributing ring (10), and a single tangential annular flow feed distributor (21) is arranged 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 box (7) comprises 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 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 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 a section of the tower wall is connected to the top of the liquid collecting channel (32), and the end connected to the tower wall is higher, while the end connected to the liquid collecting channel (32) is lower. The middle part of the liquid collecting trough (30) in the middle part bulges upward, and the two ends of the liquid collecting trough (30) in the middle part are respectively connected to two adjacent liquid collecting channels (32) and inclined toward the two liquid collecting channels (32). A plurality of 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) at intervals, and a liquid collecting ring (27) is fixed on the tower wall above the liquid baffle plate (29) at intervals. A riser pipe plugging plate (28) is connected to the outside of the riser pipe (14).

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, and extraction bucket support rings (33) are arranged at the edges of the two extraction buckets (9).

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), wherein the plurality of liquid distribution pipes (1) 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 arranged between BED2 and BED3, an oil collecting tank 3 (13) is arranged between BED3 and BED4, and an oil collecting tank 4 (16) is arranged between BED5 and BED6.

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