Rectifying tower for producing lubricant base oil

Abstract

The invention discloses a rectifying tower for lubricating oil base oil production, and relates to the technical field of rectifying towers, the rectifying tower comprises a rectifying tower body, the lower part of the rectifying tower body is fixedly connected with a fixing frame, the lower part of the fixing frame is fixedly provided with a spraying control motor, and the output end of the spraying control motor is provided with a lifting mechanism; the lifting mechanism comprises a first threaded rod arranged at the output end of the spraying control motor, the first threaded rod is rotationally connected with the fixing frame, the first threaded rod is in threaded connection with a fixing block, and one side of the fixing block is fixedly connected with a liquid storage tank. And the lifting mechanism operates to drive the rotating mechanism to synchronously operate, so that the spray head can conveniently wash positions with different heights and different angles in the rectifying tower body, a large amount of impurities can be conveniently prevented from being accumulated, the potential pollution risk caused by impurity accumulation is reduced, meanwhile, the separation efficiency of the rectifying tower can be improved, and the product quality is ensured.

Description

Technical Field

[0001] The present invention relates to the technical field of distillation columns, and particularly to a distillation column for the production of lubricating base oil. Background Art

[0002] In the production of lubricating base oil, the distillation column needs to separate different fractions to obtain the base oil. However, during operation, dirt such as rust, carbonate, silicate, gum, and asphaltene, as well as impurities such as residual solvents and additives, will accumulate inside the column. These dirt and impurities will reduce the separation efficiency of the distillation column and affect the quality of the base oil. The dirt that is not cleaned in time may cause secondary pollution in subsequent processing, increasing the difficulty of pollution control. For example, furfural refining wastewater mainly comes from the oily wastewater discharged from the stripping column. The wastewater contains oil, sulfur, COD, etc. If the residual dirt in the column causes incomplete furfural recovery, it will further increase the pollution load of the wastewater.

[0003] In the prior art, it is difficult to clean the inner wall of the distillation column after production. The raw materials of lubricating base oil may contain various impurities such as solid particles, gum, and asphaltene. During the distillation process, these impurities will gradually accumulate on the inner wall, which may hinder the gas-liquid mass transfer process, reduce the separation efficiency of the distillation column, and degrade the product quality. Therefore, a distillation column for the production of lubricating base oil is needed. Summary of the Invention

[0004] The purpose of the present invention is to solve the problem in the prior art that it is difficult to clean the inner wall of the distillation column after production. The raw materials of lubricating base oil may contain various impurities such as solid particles, gum, and asphaltene. During the distillation process, these impurities will gradually accumulate on the inner wall, which may hinder the gas-liquid mass transfer process, reduce the separation efficiency of the distillation column, and degrade the product quality. The present invention provides a distillation column for the production of lubricating base oil.

[0005] To achieve the above object, the present invention adopts the following technical solution: A distillation column for the production of lubricating base oil, comprising a distillation column body. A fixing frame is fixedly connected to the lower part of the distillation column body. A spraying control motor is fixedly installed at the lower part of the fixing frame. A lifting mechanism is provided at the output end of the spraying control motor. The lifting mechanism includes a first threaded rod provided at the output end of the spraying control motor. The first threaded rod is rotatably connected to the fixing frame. The first threaded rod is threadedly connected to a fixing block. One side of the fixing block is fixedly connected to a liquid storage tank. The liquid storage tank is slidably connected to the fixing frame. A pump body is provided at the upper part of the liquid storage tank. An outlet pipe is provided at the output end of the pump body. The outlet pipe penetrates through the fixing frame and extends into the interior of the distillation column body. A spray head is fixedly connected to the side of the outlet pipe away from the pump body; A rotating mechanism is provided at the upper part of the liquid storage tank. The rotating mechanism includes a third rotating shaft provided at the upper part of the liquid storage tank. The third rotating shaft penetrates through the fixed frame and extends outside the fixed frame. A first gear is fixedly connected to one side of the third rotating shaft. The first gear is meshed with a first rack, and the first rack is fixedly connected to the fixed frame. A bevel gear set is fixedly connected to the side of the third rotating shaft away from the first gear, and the bevel gear set is fixedly connected to the liquid outlet pipe; Wherein, both sides of the liquid storage tank are slidably connected to the grooves formed inside the fixed frame, which facilitates the lifting of the liquid storage tank driven by the fixed block.

[0006] The above technical solution further includes: The fixed block is slidably connected to the fixed frame, the third rotating shaft is rotatably connected to the liquid storage tank, and a liquid inlet is provided on one side of the liquid storage tank away from the fixed frame; Wherein, the liquid inlet facilitates the addition of cleaning agent into the liquid storage tank.

[0007] A reflux liquid port is provided on one side of the rectification tower body. A raw material inlet is provided on the side of the rectification tower body close to the reflux liquid port. A steam inlet is provided on the side of the rectification tower body away from the reflux liquid port. A liquid outlet is provided on the side of the rectification tower body close to the steam inlet.

[0008] A steam outlet is provided at the upper part of the rectification tower body, and an observation window is provided on the surface of the rectification tower body.

[0009] A protective box is fixedly connected to the side of the rectification tower body away from the observation window. A cleaning control motor is fixedly installed on the side of the protective box away from the rectification tower body, and a cleaning mechanism is provided at the output end of the cleaning control motor.

[0010] The cleaning mechanism includes a second threaded rod provided at the output end of the cleaning control motor. The second threaded rod is rotatably connected to the protective box. The second threaded rod is threadedly connected to a threaded sleeve, and a cleaning plate is fixedly connected to the side of the threaded sleeve away from the second threaded rod.

[0011] The cleaning plate is slidably connected to the protective box and slidably connected to the rectification tower body. A telescopic rod is fixedly connected to the side of the cleaning plate close to the threaded sleeve, and the side of the telescopic rod away from the cleaning plate is fixedly connected to the protective box; Wherein, two groups of telescopic rods are provided to facilitate the cleaning plate to slide stably.

[0012] A second rack is fixedly connected to the side of the cleaning plate close to the threaded sleeve. The second rack is meshed with a second gear, and the second gear is fixedly connected to a first rotating shaft. The first rotating shaft penetrates through the protective box and extends outside the protective box; When the cleaning plate moves, it drives the second gear to rotate through the second rack.

[0013] A belt is drivingly connected to the first rotating shaft. The side of the belt away from the first rotating shaft is drivingly connected to a second rotating shaft. The second rotating shaft is rotatably connected to the rectifying tower body. The second rotating shaft penetrates through the rectifying tower body and extends to the other side of the rectifying tower body. A rotating baffle is fixedly connected to the second rotating shaft; When the second rotating shaft rotates, it is convenient to drive the rotating baffle to turn over.

[0014] A lifting baffle is slidably connected inside the rectifying tower body. A collecting box is fixedly connected to the lower part of the rectifying tower body. A groove is formed between the rectifying tower body and the collecting box; The collecting box is convenient for collecting the liquid after cleaning the inner wall of the rectifying tower body and the dropped impurities.

[0015] The present invention has the following beneficial effects: In the present invention, the spraying control motor is started to drive the lifting mechanism to operate, and at the same time the lifting mechanism operates to drive the rotating mechanism to operate synchronously, which is convenient for the spray head to wash the positions at different heights and different angles inside the rectifying tower body, which is convenient for preventing a large accumulation of impurities, thereby reducing the potential pollution risk caused by the accumulation of impurities. At the same time, the separation efficiency of the rectifying tower can be improved, and the product quality can be guaranteed.

[0016] In the present invention, after the inner part of the rectifying tower body is washed, when the cleaning mechanism operates into the rectifying tower body, it drives the rotating baffle to turn over. Finally, the cleaning liquid inside the rectifying tower body flows into the collecting box through the groove. At the same time, the cleaning plate also pushes the impurities washed down into the collecting box, which is convenient for centralized treatment. This helps to improve the wastewater treatment efficiency and reduce the environmental pollution caused by improper wastewater treatment. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is a schematic diagram of the overall structure of the rectifying tower for the production of lubricating base oil proposed by the present invention; Figure 2 is a side view of the overall structure in the present invention; Figure 3 is a schematic diagram of the rotating mechanism in the present invention; Figure 4 is a schematic diagram of the lifting mechanism in the present invention; Figure 5 is a bottom view of the overall structure in the present invention; Figure 6 is a schematic diagram of the cleaning mechanism in the present invention; Figure 7 isFigure 2 Schematic enlarged view of the structure at location A in Figure 8 is Figure 3 Schematic enlarged view of the structure at location B in Figure 9 is Figure 6 Schematic enlarged view of the structure at location C in

[0018] In the figure: 1, rectification tower body; 2, observation window; 3, lifting baffle; 4, reflux liquid port; 5, raw material inlet; 6, liquid outlet; 7, rotating baffle; 8, collection box; 9, protection box; 10, steam inlet; 11, steam outlet; 12, cleaning control motor; 13, fixing frame; 14, spraying control motor; 15, liquid storage tank; 16, liquid inlet; 17, liquid outlet pipe; 18, nozzle; 19, first threaded rod; 20, first rack; 21, fixing block; 22, first gear; 23, groove; 24, second gear; 25, second threaded rod; 26, threaded sleeve; 27, cleaning plate; 28, telescopic rod; 29, first rotating shaft; 30, belt; 31, second rotating shaft; 32, pump body; 33, bevel gear set; 34, third rotating shaft; 35, second rack. Specific embodiments

[0019] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention. Embodiment

[0020] Refer to Figure 1 , Figure 3 , Figure 4 and Figure 8 , a rectification tower for the production of lubricating base oil, including a rectification tower body 1. A fixing frame 13 is fixedly connected to the lower part of the rectification tower body 1. A spraying control motor 14 is fixedly installed at the lower part of the fixing frame 13. A lifting mechanism is provided at the output end of the spraying control motor 14. The lifting mechanism includes a first threaded rod 19 provided at the output end of the spraying control motor 14. The first threaded rod 19 is rotatably connected to the fixing frame 13. The first threaded rod 19 is threadedly connected to a fixing block 21. One side of the fixing block 21 is fixedly connected to a liquid storage tank 15. The liquid storage tank 15 is slidably connected to the fixing frame 13. A pump body 32 is provided at the upper part of the liquid storage tank 15. An outlet pipe 17 is provided at the output end of the pump body 32. The outlet pipe 17 passes through the fixing frame 13 and extends into the rectification tower body 1. A nozzle 18 is fixedly connected to the side of the outlet pipe 17 away from the pump body 32; A rotating mechanism is provided at the upper part of the liquid storage tank 15. The rotating mechanism includes a third rotating shaft 34 provided at the upper part of the liquid storage tank 15. The third rotating shaft 34 penetrates through the fixed frame 13 and extends to the outside of the fixed frame 13. A first gear 22 is fixedly connected to one side of the third rotating shaft 34. The first gear 22 is meshed and connected with a first rack 20. The first rack 20 is fixedly connected to the fixed frame 13. A bevel gear set 33 is fixedly connected to the side of the third rotating shaft 34 away from the first gear 22. The bevel gear set 33 is fixedly connected to the liquid outlet pipe 17.

[0021] Reference Figure 3 And Figure 4 The fixed block 21 is slidably connected to the fixed frame 13. The third rotating shaft 34 is rotatably connected to the liquid storage tank 15. An inlet 16 is provided on one side of the liquid storage tank 15 away from the fixed frame 13.

[0022] Reference Figure 1 A reflux liquid port 4 is provided on one side of the rectification tower body 1. A raw material inlet 5 is provided on the side of the rectification tower body 1 close to the reflux liquid port 4. A steam inlet 10 is provided on the side of the rectification tower body 1 away from the reflux liquid port 4. A liquid outlet 6 is provided on the side of the rectification tower body 1 close to the steam inlet 10.

[0023] Reference Figure 1 And Figure 2 A steam outlet 11 is provided at the upper part of the rectification tower body 1. An observation window 2 is provided on the surface of the rectification tower body 1.

[0024] In this embodiment, when the rectification tower body 1 needs to be used, the raw materials enter the rectification tower body 1 from the raw material inlet 5. These raw materials are mixtures containing various components with different boiling points, including various components of lubricating base oil and some impurities. The steam enters from the steam inlet 10. The steam provides heat to heat the raw material mixture in the rectification tower body 1. As the temperature rises, the volatile components in the raw materials begin to evaporate, forming an ascending steam phase. During the ascending process of the ascending steam in the rectification tower body 1, it undergoes gas-liquid mass transfer with the reflux liquid entering from the reflux liquid port 4. The reflux liquid is a part of the condensed liquid coming out from the top of the rectification tower body 1. It flows downward along the trays or packing. In each tray or packing layer, the steam and the liquid are in full contact to carry out heat and mass exchange. The volatile components are continuously enriched in the steam phase, while the less volatile components remain more in the liquid phase. Through multiple such gas-liquid mass transfer processes, the different components in the mixture are gradually separated; After rectification separation, the vapor at the top of the rectification tower body 1 is rich in low-boiling light components. After these vapors are cooled and condensed at the top of the rectification tower body 1, a part of them returns to the inside of the rectification tower body 1 as reflux liquid to maintain the stability of the rectification operation, and the other part is discharged as light component products. At the bottom of the rectification tower body 1, the remaining liquid is rich in high-boiling heavy components, including the main components of lubricating oil base oil and some impurities. These liquids are discharged from the liquid outlet 6 on one side of the rectification tower body 1 and can be further processed subsequently to obtain lubricating oil base oil products. At the top of the rectification tower body 1, the uncondensed vapor and some non-condensable gases are discharged from the vapor outlet 11. These vapors may contain a small amount of organic substances, etc., and need to be properly treated before discharge to reduce environmental pollution. At the same time, steam is continuously introduced into the steam inlet 10 to maintain the heat balance in the tower and the continuous progress of the rectification process; After use, when it is necessary to clean the impurities accumulated on the inner wall of the rectification tower body 1, start the spraying control motor 14 fixedly installed at the lower part of the fixing frame 13. The spraying control motor 14 will cause the first threaded rod 19 arranged at the output end to rotate. The first threaded rod 19 will drive the liquid storage tank 15 to slide upward inside the fixing frame 13 through the fixedly connected fixing block 21. When the liquid storage tank 15 slides upward, it will drive the pump body 32 and the liquid outlet pipe 17 arranged at the upper part to move upward, that is, the spray head 18 fixedly connected to the upper part of the liquid outlet pipe 17 will rise inside the rectification tower body 1. At the same time, start the pump body 32 to flush the impurities on the inner wall of the rectification tower body 1 when rising; At the same time, when the liquid storage tank 15 rises, the liquid storage tank 15 will drive the third rotating shaft 34 rotatably connected to the upper part to rise. That is, under the action of the first rack 20 fixedly connected to one side of the liquid storage tank 15, the first gear 22 will drive the third rotating shaft 34 to rotate. The rotation of the third rotating shaft 34 will cause the fixedly connected bevel gear set 33 to rotate. The rotation of the bevel gear set 33 will drive the fixedly connected liquid outlet pipe 17 to rotate, facilitating the rotary rise of the spray head 18 and facilitating the comprehensive flushing of the inside of the rectification tower body 1, reducing the potential pollution risk caused by impurity accumulation. The liquid inlet 16 arranged on the side of the liquid storage tank 15 away from the fixing frame 13 is convenient for adding appropriate flushing liquid into the liquid storage tank 15. Embodiment

[0025] Reference Figure 1 、 Figure 2 And Figure 6 , a protective box 9 is fixedly connected to the side of the rectification tower body 1 away from the observation window 2. A cleaning control motor 12 is fixedly installed on the side of the protective box 9 away from the rectification tower body 1. The output end of the cleaning control motor 12 is provided with a cleaning mechanism.

[0026] Reference Figure 6, the cleaning mechanism includes a second threaded rod 25 disposed at the output end of the cleaning control motor 12. The second threaded rod 25 is rotatably connected to the protective box 9. The second threaded rod 25 is threadedly connected to a threaded sleeve 26. One side of the threaded sleeve 26 away from the second threaded rod 25 is fixedly connected to a cleaning plate 27.

[0027] Reference Figure 6 , the cleaning plate 27 is slidably connected to the protective box 9 and is slidably connected to the rectification tower body 1. One side of the cleaning plate 27 close to the threaded sleeve 26 is fixedly connected to a telescopic rod 28. One side of the telescopic rod 28 away from the cleaning plate 27 is fixedly connected to the protective box 9.

[0028] Reference Figure 6 and Figure 9 , one side of the cleaning plate 27 close to the threaded sleeve 26 is fixedly connected to a second rack 35. The second rack 35 is meshed with a second gear 24. The second gear 24 is fixedly connected to a first rotating shaft 29. The first rotating shaft 29 penetrates through the protective box 9 and extends to the outside of the protective box 9.

[0029] Reference Figure 7 , the first rotating shaft 29 is drivingly connected to a belt 30. One side of the belt 30 away from the first rotating shaft 29 is drivingly connected to a second rotating shaft 31. The second rotating shaft 31 is rotatably connected to the rectification tower body 1. The second rotating shaft 31 penetrates through the rectification tower body 1 and extends to the other side of the rectification tower body 1. The second rotating shaft 31 is fixedly connected to a rotating baffle 7.

[0030] Reference Figure 1 and Figure 5 , a lifting baffle 3 is slidably connected inside the rectification tower body 1. A collection box 8 is fixedly connected to the lower part of the rectification tower body 1. A groove 23 is formed between the rectification tower body 1 and the collection box 8.

[0031] In this embodiment, after the inner wall of the rectification tower body 1 is rinsed, the cleaning control motor 12 is started, so that the second threaded rod 25 disposed at the output end of the cleaning control motor 12 rotates. The rotation of the second threaded rod 25 will cause the threaded sleeve 26 connected by threads to drive the cleaning plate 27 to move towards the rectification tower body 1. The cleaning plate 27 is slidably connected to both the protective box 9 and the rectification tower body 1, and the two groups of nozzles 18 fixedly connected to one side of the cleaning plate 27 are fixedly connected to the protective box 9, which are all convenient for keeping the cleaning plate 27 stable when moving. When the cleaning plate 27 moves towards the rectification tower body 1, it will drive the fixedly connected second rack 35 to move. The second rack 35 will cause the meshed second gear 24 to rotate, and the second gear 24 will drive the fixedly connected first rotating shaft 29 to rotate; When the first rotating shaft 29 rotates, it will drive the second rotating shaft 31 to rotate through the driving belt 30. When the second rotating shaft 31 rotates, the rotating baffle 7 fixed on the second rotating shaft 31 will turn over, and finally the groove 23 opened between the rectifying tower body 1 and the collection box 8 will be exposed. At this time, the flushing liquid inside the rectifying tower body 1 will flow into the collection box 8 through the groove 23. When the cleaning plate 27 moves to the lifting baffle 3, the lifting baffle 3 will move upward at this time and retract into the rectifying tower body 1. At this time, the cleaning plate 27 will slide into the rectifying tower body 1 and continue to move towards the groove 23, that is, the impurities washed down inside the rectifying tower body 1 will be pushed into the collection box 8 through the groove 23, which is convenient for centralized treatment and improves the wastewater treatment efficiency. After the cleaning is completed, the rotating baffle 7 is moved in the reverse direction and restored to its original position. At the same time, under the action of the second rack 35 driving the second gear 24 to rotate in the reverse direction, the rotating baffle 7 is restored to its original position, and then the lifting baffle 3 is moved downward to its original position, which is convenient for the next rectification separation.

[0032] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A rectifying column for the production of lubricating base oil, comprising a rectifying column body (1), characterized in that: A fixing frame (13) is fixedly connected to the lower part of the rectifying tower body (1). A spraying control motor (14) is fixedly installed at the lower part of the fixing frame (13). A lifting mechanism is provided at the output end of the spraying control motor (14). The lifting mechanism includes a first threaded rod (19) provided at the output end of the spraying control motor (14). The first threaded rod (19) is rotatably connected to the fixing frame (13). A fixing block (21) is threadedly connected to the first threaded rod (19). A liquid storage tank (15) is fixedly connected to one side of the fixing block (21). The liquid storage tank (15) is slidably connected to the fixing frame (13). A pump body (32) is provided at the upper part of the liquid storage tank (15). An outlet pipe (17) is provided at the output end of the pump body (32). The outlet pipe (17) penetrates through the fixing frame (13) and extends into the rectifying tower body (1). A spray head (18) is fixedly connected to the side of the outlet pipe (17) away from the pump body (32). A rotating mechanism is provided at the upper part of the liquid storage tank (15). The rotating mechanism includes a third rotating shaft (34) provided at the upper part of the liquid storage tank (15). The third rotating shaft (34) penetrates through the fixing frame (13) and extends outside the fixing frame (13). A first gear (22) is fixedly connected to one side of the third rotating shaft (34). The first gear (22) is meshed with a first rack (20). The first rack (20) is fixedly connected to the fixing frame (13). A bevel gear set (33) is fixedly connected to the side of the third rotating shaft (34) away from the first gear (22). The bevel gear set (33) is fixedly connected to the outlet pipe (17).

2. The rectifying column for the production of lubricating base oil according to claim 1, characterized in that, The fixing block (21) is slidably connected to the fixing frame (13). The third rotating shaft (34) is rotatably connected to the liquid storage tank (15). An inlet port (16) is provided at the side of the liquid storage tank (15) away from the fixing frame (13).

3. The rectifying column for the production of lubricating oil base oil according to claim 1, characterized in that, A reflux liquid port (4) is provided at one side of the rectifying tower body (1). A raw material inlet (5) is provided at the side of the rectifying tower body (1) close to the reflux liquid port (4). A steam inlet (10) is provided at the side of the rectifying tower body (1) away from the reflux liquid port (4). An outlet port (6) is provided at the side of the rectifying tower body (1) close to the steam inlet (10).

4. The rectifying column for the production of lubricating base oil according to claim 1, characterized in that, A steam outlet (11) is provided at the upper part of the rectifying tower body (1). An observation window (2) is provided on the surface of the rectifying tower body (1).

5. The rectifying column for the production of lubricating oil base oil according to claim 1, characterized in that, A protective box (9) is fixedly connected to the side of the rectifying tower body (1) away from the observation window (2). A cleaning control motor (12) is fixedly installed at the side of the protective box (9) away from the rectifying tower body (1). A cleaning mechanism is provided at the output end of the cleaning control motor (12).

6. The rectifying column for the production of lubricating oil base oil according to claim 5, characterized in that, The cleaning mechanism includes a second threaded rod (25) arranged at the output end of the cleaning control motor (12). The second threaded rod (25) is rotatably connected to the protective box (9). The second threaded rod (25) is threadedly connected to a threaded sleeve (26). One side of the threaded sleeve (26) away from the second threaded rod (25) is fixedly connected to a cleaning plate (27).

7. The rectifying column for the production of lubricating base oil according to claim 6, characterized in that, The cleaning plate (27) is slidably connected to the protective box (9), and the cleaning plate (27) is slidably connected to the rectifying tower body (1). One side of the cleaning plate (27) close to the threaded sleeve (26) is fixedly connected to a telescopic rod (28). One side of the telescopic rod (28) away from the cleaning plate (27) is fixedly connected to the protective box (9).

8. The rectifying column for the production of lubricating oil base oil according to claim 6, characterized in that, One side of the cleaning plate (27) close to the threaded sleeve (26) is fixedly connected to a second rack (35). The second rack (35) is meshed with a second gear (24). The second gear (24) is fixedly connected to a first rotating shaft (29). The first rotating shaft (29) penetrates through the protective box (9) and extends to the outside of the protective box (9).

9. The rectifying column for the production of lubricating oil base oil according to claim 8, characterized in that, The first rotating shaft (29) is drivingly connected to a belt (30). One side of the belt (30) away from the first rotating shaft (29) is drivingly connected to a second rotating shaft (31). The second rotating shaft (31) is rotatably connected to the rectifying tower body (1). The second rotating shaft (31) penetrates through the rectifying tower body (1) and extends to the other side of the rectifying tower body (1). The second rotating shaft (31) is fixedly connected to a rotating baffle (7).

10. The rectifying column for the production of lubricating base oil according to claim 1, characterized in that, A lifting baffle (3) is slidably connected inside the rectifying tower body (1). A collection box (8) is fixedly connected to the lower part of the rectifying tower body (1). A groove (23) is formed between the rectifying tower body (1) and the collection box (8).

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