A vacuum distillation tower for regenerating base oil from waste oil

Abstract

This invention relates to the field of distillation column technology, and more specifically, to a vacuum distillation column for regenerating base oil from waste oil. The column includes a column shell and a gas distributor and several fractionation sections arranged sequentially from bottom to top within the column shell. A vacuum pipe is installed at the upper end of the column shell, and an oil vapor pipe and a steam pipe are installed at the lower end. The gas distributor includes a mixing section, a connecting section, and a homogenizing section that are interconnected from bottom to top. The fractionation sections include an oil spray ring, an oil buffer, and an oil collector arranged sequentially from top to bottom. Several oil outlet pipes are provided on the side wall of the column shell, and the oil collector is connected to the corresponding oil outlet pipe. The oil buffer includes a first separator, a second separator, a third separator, and a fourth separator arranged sequentially from top to bottom. This invention, by setting up a gas distributor composed of a mixing section, a connecting section, and a homogenizing section, ensures the uniformity and stability of the rising gas flow, thereby improving the separation accuracy and yield of the product.

Description

Technical Field

[0001] This invention relates to the field of distillation tower technology, and more specifically, to a vacuum distillation tower for regenerating base oil from waste oil. Background Technology

[0002] Waste lubricating oil contains a large number of useful base oil components, which can be regenerated and recovered through vacuum distillation, a key technology for achieving resource recycling. The vacuum distillation column is the core equipment in this process; its function is to separate the vaporized waste oil into base oil products of different specifications based on their boiling point range under high vacuum conditions.

[0003] Existing waste oil regeneration vacuum distillation towers typically include internal components such as the tower body, packing, or trays. In actual operation, the following technical challenges exist:

[0004] 1. Uneven feed distribution: High-temperature oil vapor and stripping steam enter from the bottom of the tower. If the initial distribution is poor, it will lead to uneven gas velocity and concentration on the cross-section of the tower, forming channeling and dead zones, which will significantly reduce the mass and heat transfer efficiency of the tower plates and affect the product separation accuracy and yield.

[0005] 2. Insufficient liquid distribution and contact: The reflux liquid in the fractionation section needs to make sufficient contact with the rising oil vapor. Traditional distillation columns have short liquid residence times, resulting in insufficient contact between the gas and liquid phases, making it difficult to further improve the separation efficiency. For example, in a vacuum distillation column and vacuum distillation method disclosed in patent application number 201310544719.7, the oil is sprayed directly down, making it difficult to guarantee the fractionation effect.

[0006] In addition, after long-term operation, the distillation tower is prone to forming coke scale on the inner wall of the tower, which requires manual cleaning and seriously affects the continuous operation cycle and production efficiency of the equipment.

[0007] Therefore, it is necessary to improve existing technologies. Summary of the Invention

[0008] To overcome the shortcomings of existing technologies, a vacuum distillation column device is provided that can achieve uniform gas-liquid distribution and prolong gas-liquid contact time.

[0009] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is as follows:

[0010] A vacuum distillation column for regenerating base oil from waste oil includes a column shell and a gas distributor and several fractionation sections arranged sequentially from bottom to top within the column shell. A vacuum pipe is installed at the upper end of the column shell, and an oil vapor pipe and a steam pipe are installed at the lower end. The gas distributor includes a mixing section, a connecting section, and a homogenization section that are interconnected from bottom to top. The mixing section is a hollow frustum with a smaller upper section and a larger lower section. A spiral guide groove is provided on the lower end face of the mixing section. The outlets of the oil vapor pipe and the steam pipe both point towards the spiral guide groove. The homogenization section also includes a hollow frustum with a larger upper section and a smaller lower section. Vertically distributed transverse homogenization groups and longitudinal homogenization groups are arranged within the homogenization section. Each transverse and longitudinal homogenization group includes at least three layers of distribution rods, with the bottom layer being a single distribution rod, and the number of distribution rods increasing sequentially upwards.

[0011] The fractionation section includes an oil injection ring, an oil buffer, and an oil collector arranged sequentially from top to bottom. The side wall of the tower is provided with several oil outlet pipes, which are connected to an oil storage box. The oil collector is connected to the corresponding oil outlet pipe, and the oil storage box is provided with a branch connected to the oil injection ring. The oil buffer includes a first separator, a second separator, a third separator, and a fourth separator arranged sequentially from top to bottom. There are gaps between the first separator, the second separator, the third separator, and the fourth separator. The oil injection ring is located at the upper end of the first separator, and the oil is dispersed by passing through the first separator, the second separator, the third separator, and the fourth separator in sequence.

[0012] Preferably, the oil collector includes an oil collecting plate and an oil baffle block. The oil collecting plate is provided with a plurality of vent holes, and an oil baffle ring is provided at the upper end of the vent holes. The oil baffle block is provided at the upper end of the oil baffle ring, and the outer diameter of the oil baffle block is larger than the inner diameter of the oil baffle ring.

[0013] Preferably, it also includes a cleaning device, which includes a rotating plate and a scraper disposed on the rotating plate.

[0014] The sidewall of the oil collecting plate is connected to an installation ring via several hollow pipes. A first rotating ring is provided between the installation ring and the sidewall of the tower. The inner and outer sides of the first rotating ring are rotatably connected to the tower and the installation ring, respectively, and are axially limited. A first cavity is formed between the first rotating ring and the tower, and a second cavity is formed between the first rotating ring and the installation ring. A channel is provided on the first rotating ring to connect the first cavity and the second cavity. The first cavity is connected to the hollow pipes, and the second cavity is connected to the corresponding oil outlet pipe.

[0015] A second rotating ring is provided between the oil injection ring and the tower side wall, and a third cavity is formed between the second rotating ring and the tower side wall. A return port connected to the branch is provided on the tower. The third cavity is connected to the return port and the oil injection ring.

[0016] The rotating plate is fixedly connected to the first rotating ring and the second rotating ring. The end of the scraper away from the rotating plate contacts the inner wall of the tower. The rotating plate is driven by a power motor.

[0017] Preferably, a support bearing is installed in the middle of the vacuum tube, the inner side of the support bearing is fixedly connected to the rotating plate, and the outer side of the support bearing is driven by the power motor.

[0018] Preferably, the first dispenser is an annular plate structure, the top of the cross-section of the first dispenser is an arc, the two sides of the arc are connected to an inclined downward annular plate, and the lower end of the annular plate is a dripping part.

[0019] Preferably, there are two second distributors, and the shape of the second distributor is the same as that of the first distributor. The two second distributors are respectively located directly below the dripping part of the first distributor.

[0020] Preferably, the third distributor includes four concentrically arranged first rings, each corresponding to the dripping section of the second distributor, and adjacent first rings are fixedly connected by a first connecting rod.

[0021] The lower ends of the first and second liquid dispensers are fixedly connected to a second connecting rod, and the second connecting rod is fixedly connected to the first connecting rod.

[0022] Preferably, the fourth distributor includes eight concentrically arranged second rings, the tops of which correspond to the inner and outer rings of the four first rings, respectively.

[0023] Preferably, the distribution rod is a hollow rod, with both ends welded to the homogenization section, the lower end of the distribution rod being an inverted triangle, and the upper end being an arc shape.

[0024] The beneficial effects of this invention compared to the prior art are as follows:

[0025] 1. This invention utilizes a gas distributor consisting of a mixing section, a connecting section, and a homogenization section. A spiral guide channel initially mixes oil vapor and steam, which are then accelerated through a narrowing connecting section. Finally, the gas is diffused through multiple layers of distribution rods in the homogenization section, resulting in uniform gas distribution across the entire cross-section of the column. This ensures the uniformity and stability of the rising gas flow, laying the foundation for subsequent fractionation and improving product separation accuracy and yield.

[0026] 2. The fractionation section employs a combination design of an oil injection ring and a multi-stage oil buffer. After initial distribution by the oil injection ring, the oil flows through the first, second, third, and fourth separators for further refinement and redistribution. The multi-stage buffering and dispersion structure significantly increases the specific surface area of ​​the liquid and slows down the descent rate of the oil, thereby greatly extending the contact time between the gas and liquid phases. This allows for more thorough heat and mass transfer, improving the separation efficiency of the single-stage fractionation section.

[0027] 3. This invention integrates a rotary cleaning device within the tower. A power motor drives the rotating plate and scraper via gears and support bearings, quickly removing coke and deposits from the tower's inner wall, reducing downtime for cleaning. The design of the first and second rotating rings achieves a dynamic connection between the rotating cleaning components and the stationary oil collection and return pipelines, resolving interference issues between moving and stationary parts and ensuring stable operation of both core process functions and auxiliary cleaning functions. Attached Figure Description

[0028] The specific embodiments of the present invention will be further described in detail below with reference to the accompanying drawings.

[0029] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0030] Figure 2 This is a schematic diagram of the half-section structure of the present invention;

[0031] Figure 3 This is a schematic diagram of the structure of the present invention without the tower cylinder;

[0032] Figure 4 This is a schematic diagram of the fractionation section structure;

[0033] Figure 5 This is a schematic diagram of a gas distributor.

[0034] Figure 6 This is a schematic diagram of the half-section structure of the fractionation section;

[0035] Figure 7 This is a schematic diagram of a half-section of a gas distributor.

[0036] Figure 8 for Figure 6 A structural diagram of the structure shown from another angle;

[0037] Figure 9 for Figure 7 A structural diagram of the structure shown from another angle;

[0038] Figure 10 for Figure 8 A magnified view of part A in the image;

[0039] Figure 11 for Figure 8 A magnified view of part B in the image;

[0040] Figure 12 for Figure 8 A magnified view of part C.

[0041] In the diagram: 1-Tower; 11-Vacuum pipe; 12-Oil-gas pipe; 13-Steam pipe; 14-Oil outlet pipe; 15-Branch; 2-Gas distributor; 21-Mixing section; 211-Spiral guide groove; 22-Connecting section; 23-Homogenization section; 221-Transverse homogenization group; 222-Vertical homogenization group; 223-Distribution rod; 3-Fraction section; 31-Injection ring; 32-Oil buffer; 33-Oil collector; 331-Oil collecting plate; 332-Oil baffle block; 333-Vent hole; 334-Oil baffle ring; 335-Hollow tube 336-Mounting ring; 34-First distributor; 341-Annular plate; 342-Drip section; 35-Second distributor; 36-Third distributor; 361-First ring; 362-First connecting rod; 363-Second connecting rod; 37-Fourth distributor; 371-Second ring; 4-Cleaning device; 41-Rotating plate; 42-Scraper; 43-First rotating ring; 431-First cavity; 432-Second cavity; 44-Second rotating ring; 441-Third cavity; 45-Power motor; 46-Support bearing. Detailed Implementation

[0042] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0043] Example:

[0044] like Figures 1 to 12 As shown, a vacuum distillation column for regenerating base oil from waste oil includes a column 1 and a gas distributor 2 and several fractionation sections 3 arranged sequentially from bottom to top within the column 1. A vacuum pipe 11 is installed at the upper end of the column 1, which is used to connect to vacuum equipment to maintain a low-pressure state within the column 1. An oil vapor pipe 12 and a steam pipe 13 are installed at the lower end of the column 1. The oil vapor pipe 12 is used to introduce vaporized waste oil, and the steam pipe 13 is used to introduce stripping steam. A slurry collection chamber is also provided at the lower end of the column 1.

[0045] In order to ensure that oil vapor and steam enter the fractionation section 3 evenly, the gas distributor 2 includes a mixing section 21, a connecting section 22 and a homogenization section 23 that are interconnected from bottom to top. The mixing section 21 is used to mix oil vapor and steam, the connecting section 22 is used to introduce the mixed gas into the homogenization section 23, and the homogenization section 23 is used to distribute the gas evenly within the cross-section of the tower 1.

[0046] Specifically, the mixing section 21 is a hollow frustum with a smaller top and a larger bottom. The lower end face of the mixing section 21 is provided with a spiral guide groove 211. The outlets of the oil-gas pipe 12 and the steam pipe 13 both point to the spiral guide groove 211, so that the oil-gas and steam mix with each other in the mixing section 21 and enter the connecting section 22.

[0047] The homogenization section 23 includes a hollow frustum that is larger at the top and smaller at the bottom. The homogenization section 23 is provided with a vertically distributed transverse homogenization group 221 and a longitudinal homogenization group 222. Both the transverse homogenization group 221 and the longitudinal homogenization group 222 include at least three layers of distribution rods 223. In this article, transverse and longitudinal refer to two mutually perpendicular directions in the horizontal plane.

[0048] The bottom layer has a single distribution bar 223, and the number of distribution bars 223 increases sequentially with each upward layer. Preferably, the second layer has two distribution bars 223, and the third layer has three distribution bars 223. The gas first passes through the bottom layer distribution bar 223 and is split in two, then passes through the upper layer distribution bars 223 multiple times, and finally diffuses into the entire cross-section of the column 1. By first mixing, then passing through the narrowed connecting section 22 into the homogenization section 23, and finally being uniformly diffused through the homogenization section 23, the gas can enter the fractionation section 3 evenly.

[0049] The fractionation section 3 includes, from top to bottom, an oil spray ring 31, an oil buffer 32, and an oil collector 33. The oil spray ring 31 has multiple oil outlets evenly distributed on its lower side. The oil spray ring 31 is used to reintroduce a portion of the fractionated oil into the column 1, allowing the rising oil vapor to contact the downwardly sprayed oil and perform gas-liquid heat and mass transfer, thus improving the fractionation effect. The oil buffer 32 is used to evenly distribute the oil, ensuring sufficient contact between the oil and gas, and to increase the contact time between the oil and gas by slowing down the oil's descent speed.

[0050] The side wall of the tower 1 is provided with several oil outlet pipes 14, each connected to an oil storage box for storing oil. An oil collector 33 is connected to a corresponding oil outlet pipe 14. The oil storage box has a branch 15 connected to an oil spray ring 31. Part of the oil collected by the oil collector 33 is discharged through the oil outlet pipe 14, while the remainder returns to the tower 1 through the branch 15 and the oil spray ring 31. The branch 15 can be connected to an oil pump, which pumps the oil from the oil storage box into the branch 15. Preferably, there are three oil outlet pipes 14 and three fractionation sections 3.

[0051] The oil buffer 32 includes a first distributor 34, a second distributor 35, a third distributor 36, and a fourth distributor 37 arranged sequentially from top to bottom. Gaps are provided between each of the four distributors to allow rising gas to pass through. An injection ring 31 is positioned above the first distributor 34, and the oil is dispersed sequentially through these distributors.

[0052] Preferably, the first distributor 34 is an annular plate structure. The top of the cross-section of the first distributor 34 is an arc, and inclined downward annular plates 341 are connected to both sides of the arc. The lower end of the annular plates is a dripping section 342. The oil sprayed from the nozzle of the oil injection ring 31 first falls on the arc of the first distributor 34, is divided in two by the arc, and then drips down from the dripping sections 342 on both sides through the annular plates 341. Two second distributors 35 are provided. The shape of the second distributor 35 is the same as that of the first distributor 34. The two second distributors 35 are respectively located directly below the dripping section 342 of the first distributor 34. The oil dripping from the first distributor 34 is divided in two again by the second distributors 35 and drips down from the dripping section of the second distributor 35. Preferably, fan-shaped guide strips can be provided on the annular plates 341 of the first distributor 34 and the second distributor 35 to further disperse the oil on the annular plates 341; through holes can also be provided on the annular plates 341 of the first distributor 34 to improve the gas passage efficiency.

[0053] The third distributor 36 includes four concentrically arranged first rings 361, which correspond to the dripping section of the second distributor 35 respectively; the fourth distributor 37 includes eight concentrically arranged second rings 371, whose tops correspond to the inner and outer rings of the four first rings 361 respectively. The oil after being divided by the second distributor 35 is further divided by the first rings 361 and the second rings 371, which improves the uniformity of the oil distribution and effectively slows down the rate of oil descent.

[0054] The adjacent first rings 361 are fixedly connected by the first connecting rod 362. The lower ends of the first liquid dispenser 34 and the second liquid dispenser 35 are fixedly connected to the second connecting rod 363, which is fixedly connected to the first connecting rod 362.

[0055] The oil collector 33 includes an oil collecting plate 331 and an oil baffle block 332. The oil collecting plate 331 is fixed relative to the third separator 36 and the fourth separator 37. The oil collecting plate 331 is provided with multiple vent holes 333 to facilitate the passage of rising gas. An oil baffle ring 334 is provided at the upper end of the vent hole 333, and the oil baffle block 332 is provided at the upper end of the oil baffle ring 334. The outer diameter of the oil baffle block 332 is larger than the inner diameter of the oil baffle ring 334. The oil baffle ring 334 and the oil baffle block 332 are used to prevent the oil collected by the oil collecting plate 331 from flowing downward from the vent holes 333, thereby reducing the fractionation efficiency.

[0056] Preferably, a cleaning device 4 is provided inside the tower 1. The cleaning device 4 includes a rotating plate 41 and a scraper 42 disposed on the rotating plate 41. The end of the scraper 42 away from the rotating plate 41 contacts the inner wall of the tower 1. The rotating plate 41 drives the scraper 42 to move, thereby cleaning the inner wall of the tower 1. A support bearing 46 is installed in the middle of the vacuum tube 11. The inner side of the support bearing 46 is fixedly connected to the rotating plate 41. A power motor 45 is fixedly installed on the tower 1. A gear that mates with the support bearing 46 is installed on the motor shaft of the power motor 45. The power motor 45 drives the support bearing 46 to rotate, thereby driving the rotating plate 41 and the scraper 42 to rotate. Preferably, the rotating plate 41 is spiral-shaped.

[0057] To prevent interference between the rotating plate 41 and the oil collecting plate 331 during rotation, the side wall of the oil collecting plate 331 is connected to an installation ring 336 via several hollow pipes 335. A first rotating ring 43 is provided between the installation ring 336 and the side wall of the tower 1. The inner and outer sides of the first rotating ring 43 are rotatably connected to the tower 1 and the installation ring 336 respectively and are axially limited. A first cavity 431 is formed between the first rotating ring 43 and the tower 1, and a second cavity 432 is formed between the first rotating ring 43 and the installation ring 336. The first rotating ring 43 is provided with a channel connecting the first cavity 431 and the second cavity 432. The first cavity 431 is connected to the hollow pipes 335, and the second cavity 432 is connected to the corresponding oil outlet pipe 14. The oil collected by the oil collecting plate 331 enters the first cavity 431 through the hollow pipes 335, then enters the second cavity 432 through the channel inside the first rotating ring 43, and is finally discharged through the oil outlet pipe 14.

[0058] The rotating plate 41 is fixedly connected to the mounting ring 336. When the rotating plate 41 rotates, it can drive the mounting ring 336 to rotate. The rotation of the mounting ring 336 does not affect the oil collected by the oil collecting plate 331 from entering the oil outlet pipe 14.

[0059] A second rotating ring 44 is provided between the oil injection ring 31 and the side wall of the tower 1, forming a third cavity 441. A reflux port communicating with branch 15 is provided on the tower 1. The third cavity 441 is connected to the reflux port and the oil injection ring 31. The second rotating ring 44 is fixedly connected to the rotating plate 41 and rotates with the rotating plate 41. The rotation of the second rotating ring 44 does not affect the entry of oil from branch 15 into the oil injection ring 31, thus ensuring the normal operation of the vacuum distillation tower.

[0060] Preferably, the distribution rod 223 is a hollow rod, with both ends welded to the homogenization section 23. The lower end of the distribution rod 223 is an inverted triangle to ensure gas homogenization. The upper end of the distribution rod is arc-shaped, allowing the liquefied oil in the homogenization section 21 to drip normally to the lower end of the tower 1.

[0061] The above description only illustrates the preferred embodiments of the present invention. However, the present invention is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present invention, and all such changes should be included within the protection scope of the present invention.

Claims

1. A vacuum distillation column for regenerating base oil from waste oil, comprising a column (1) and a gas distributor (2) and several fractionation sections (3) arranged sequentially from bottom to top within the column (1); a vacuum pipe (11) is provided at the upper end of the column (1), and an oil vapor pipe (12) and a steam pipe (13) are provided at the lower end of the column (1); characterized in that: The gas distributor (2) includes a mixing section (21), a connecting section (22), and a homogenizing section (23) that are interconnected from bottom to top. The mixing section (21) is a hollow frustum that is smaller at the top and larger at the bottom. A spiral guide groove (211) is provided on the lower end face of the mixing section (21). The outlets of the oil-gas pipe (12) and the steam pipe (13) both point to the spiral guide groove (211). The homogenizing section (23) includes a hollow frustum that is larger at the top and smaller at the bottom. Vertically distributed transverse homogenizing groups (221) and longitudinal homogenizing groups (222) are provided in the homogenizing section (23). Both the transverse homogenizing group (221) and the longitudinal homogenizing group (222) include at least three layers of distribution rods (223). The bottom layer is a single distribution rod (223), and the number of distribution rods (223) increases sequentially from top to bottom. The fractionation section (3) includes an oil injection ring (31), an oil buffer (32), and an oil collector (33) arranged sequentially from top to bottom. The side wall of the tower (1) is provided with several oil outlet pipes (14), and the oil outlet pipes (14) are connected to an oil storage box. The oil collector (33) is connected to the corresponding oil outlet pipe (14). The oil storage box is provided with a branch (15) connected to the oil injection ring (31). The oil buffer (32) includes a first separator arranged sequentially from top to bottom. The first distributor (34), the second distributor (35), the third distributor (36) and the fourth distributor (37) are separated by gaps. The oil injection ring (31) is located at the upper end of the first distributor (34). The oil is dispersed by passing through the first distributor (34), the second distributor (35), the third distributor (36) and the fourth distributor (37) in sequence. The oil collector (33) includes an oil collecting plate (331) and an oil baffle block (332). The oil collecting plate (331) is provided with a plurality of vent holes (333). An oil baffle ring (334) is provided at the upper end of the vent holes (333). The oil baffle block (332) is provided at the upper end of the oil baffle ring (334). The outer diameter of the oil baffle block (332) is larger than the inner diameter of the oil baffle ring (334). It also includes a cleaning device (4), which includes a rotating plate (41) and a scraper (42) disposed on the rotating plate (41). The side wall of the oil collecting plate (331) is connected to an installation ring (336) through several hollow pipes (335). A first rotating ring (43) is provided between the installation ring (336) and the side wall of the tower (1). The inner and outer sides of the first rotating ring (43) are rotatably connected to the tower (1) and the installation ring (336) respectively and are axially limited. A first cavity (431) is formed between the first rotating ring (43) and the tower (1). A second cavity (432) is formed between the first rotating ring (43) and the installation ring (336). A channel is provided on the first rotating ring (43) to connect the first cavity (431) and the second cavity (432). The first cavity (431) is connected to the hollow pipe (335), and the second cavity (432) is connected to the corresponding oil outlet pipe (14). A second rotating ring (44) is provided between the oil injection ring (31) and the side wall of the tower (1). A third cavity (441) is formed between the second rotating ring (44) and the side wall of the tower (1). A return port connected to the branch (15) is provided on the tower (1). The third cavity (441) is connected to the return port and the oil injection ring (31). The rotating plate (41) is fixedly connected to the first rotating ring (43) and the second rotating ring (44). The scraper (42) is in contact with the inner wall of the tower (1) at one end away from the rotating plate (41). The rotating plate (41) is connected to a power motor (45). A support bearing (46) is installed in the middle of the vacuum tube (11). The inner side of the support bearing (46) is fixedly connected to the rotating plate (41), and the outer side of the support bearing (46) is connected to the power motor (45) for transmission.

2. The vacuum distillation tower for regenerating base oil from waste oil according to claim 1, characterized in that: The first liquid dispenser (34) is an annular plate structure. The top of the cross-section of the first liquid dispenser (34) is an arc, and the two sides of the arc are connected to an inclined downward annular plate (341). The lower end of the annular plate is the dripping part (342).

3. A vacuum distillation tower for regenerating base oil from waste oil according to claim 2, characterized in that: There are two second liquid dispensers (35). The shape of the second liquid dispenser (35) is the same as that of the first liquid dispenser (34). The two second liquid dispensers (35) are respectively located directly below the dripping part (342) of the first liquid dispenser (34).

4. A vacuum distillation tower for regenerating base oil from waste oil according to claim 3, characterized in that: The third liquid dispenser (36) includes four concentric first rings (361), which are respectively arranged corresponding to the dripping part of the second liquid dispenser (35). Adjacent first rings (361) are fixedly connected by a first connecting rod (362). The lower ends of the first liquid dispenser (34) and the second liquid dispenser (35) are fixedly connected to a second connecting rod (363), and the second connecting rod (363) is fixedly connected to the first connecting rod (362).

5. A vacuum distillation tower for regenerating base oil from waste oil according to claim 4, characterized in that: The fourth distributor (37) includes eight concentrically arranged second rings (371), the tops of which correspond to the inner and outer rings of the four first rings (361), respectively.

6. A vacuum distillation tower for regenerating base oil from waste oil according to claim 1, characterized in that: The distribution rod (223) is a hollow rod. Both ends of the distribution rod (223) are welded to the homogenization section (23). The lower end of the distribution rod (223) is an inverted triangle, and the upper end of the distribution rod is an arc.

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