Waste mineral oil pretreatment system

Abstract

The invention relates to the technical field of waste mineral oil treatment, and discloses a waste mineral oil pretreatment system which comprises a stirring tank and a flash tower, and a filtering tank is arranged between the stirring tank and the flash tower; one side of the stirring tank is communicated with an air pump, and the air pump conveys heated steam into the stirring tank through an air conveying pipe and pumps hot air into the stirring tank through high pressure; the filtering tank is respectively communicated with the stirring tank and the flash tower through a high-pressure pipeline with a valve; two groups of second filter plates distributed at the inner top and the inner bottom of the filter tank are arranged in the filter tank, and one end of the high-pressure pipeline extends into the filter tank and penetrates through the second filter plate located at the inner bottom of the filter tank. According to the device, waste mineral oil is heated and stirred, so that the processing efficiency is improved, uniform treatment of the waste mineral oil is ensured, the stirred waste mineral oil is filtered, and the extraction purity after flash evaporation is ensured.

Description

Technical Field

[0001] The present invention relates to the technical field of waste mineral oil treatment, and particularly to a waste mineral oil pretreatment system. Background Art

[0002] Mineral oil is a mixture obtained by refining petroleum. Specifically, crude oil undergoes atmospheric and vacuum fractional distillation, solvent extraction, dewaxing, and hydrofining to produce mineral oil. Its main components include alkanes with C15 - C36, polycyclic aromatic hydrocarbons (PAHs), olefins, benzene series, phenols, etc. It is extremely widely used in various industries of the national economy, mainly for mechanical equipment, power devices, transportation equipment, electrical equipment, and metal processing industries in industrial and mining enterprises. Waste mineral oil mainly includes waste lubricating oil, engine oil, hydraulic oil, transformer oil, rust preventive oil, solvent oil, etc. replaced from the above-mentioned equipment, as well as waste lubricating oil, waste engine oil, etc. replaced after use by transportation vehicles (automobiles, trains, ships, aircraft). Due to external factors such as impurity contamination, oxidation, or thermal decomposition during processing and use, its original physical and chemical properties have changed and it cannot be used continuously. Moreover, waste mineral oil contains various toxic substances, which pose certain hazards to human health. Once a large amount enters the environment, it will also pollute water bodies and soil, affecting the living environment of animals, plants, and humans.

[0003] Publication number "CN113105937B" discloses a waste mineral oil treatment system and treatment method. The treatment system includes a pretreatment device, a vacuum distillation device, a base oil adjustment device, N extraction devices, N flash evaporation devices, and a stripping device. The pretreatment device obtains pretreated waste mineral oil; the vacuum distillation device performs vacuum distillation on the pretreated waste mineral oil; the base oil adjustment device is connected to the N side line outlets of the vacuum distillation device to formulate N types of base oil; the extraction devices are connected to the base oil adjustment device one by one to perform extraction treatment to obtain N groups of extraction phases and raffinate phases; the flash evaporation devices are connected to the respective extraction devices one by one to perform flash evaporation treatment to obtain the corresponding bottom oils of each tower; the stripping device is connected to the respective flash evaporation devices one by one to perform stripping treatment to obtain the corresponding bottom mineral oils of each tower, where N≥3. This waste mineral oil treatment system can greatly simplify the pretreatment equipment, reduce costs, and avoid secondary pollution.

[0004] In the above-described solution, although it can greatly simplify the pretreatment equipment, reduce costs, and avoid secondary pollution, in this solution, incomplete stirring of waste mineral oil may occur during pretreatment, resulting in uneven heating and distribution, which affects subsequent extraction; and there is no filtration device after stirring, and directly entering flash evaporation may cause the extraction purity not to meet the requirements, reducing the recovery efficiency of waste mineral oil. Summary of the Invention

[0005] The present invention provides a waste mineral oil pretreatment system, which solves the problems mentioned in the above background technology. During pretreatment, incomplete stirring of waste mineral oil may occur, resulting in uneven heating and distribution, which affects subsequent extraction. Moreover, there is no filtration device after stirring, and directly entering the flash evaporation may lead to the extraction purity not meeting the requirements, reducing the recovery efficiency of waste mineral oil.

[0006] The present invention provides the following technical solutions: A waste mineral oil pretreatment system includes a stirring tank and a flash evaporation tower, and a filtration tank is provided between the stirring tank and the flash evaporation tower; one side of the stirring tank is communicated with an air pump, and the air pump conveys heated steam into the stirring tank through an air delivery pipe and pumps hot air into the stirring tank under high pressure; the filtration tank is communicated with the stirring tank and the flash evaporation tower respectively through a high-pressure pipeline with a valve; two groups of second filter plates are arranged at the top and bottom inside the filtration tank, and one end of the high-pressure pipeline extends into the filtration tank and penetrates through the second filter plate located at the bottom inside the filtration tank.

[0007] As an alternative solution of the waste mineral oil pretreatment system of the present invention, wherein: A tank cover is arranged on the top of the stirring tank, a motor is fixed on the tank cover, the output shaft end of the motor is connected with a stirring shaft, and sleeves are equidistantly arrayed on the surface of the stirring shaft, and stirring blades are equidistantly arrayed on the outer circle of the sleeves.

[0008] As an alternative solution of the waste mineral oil pretreatment system of the present invention, wherein: A liquid guiding groove is opened on one side inside the stirring blade, one end of the liquid guiding groove is located at the tail of the stirring blade and communicated with a liquid outlet, and floating guide plates are equidistantly arrayed in the liquid guiding groove.

[0009] As an alternative solution of the waste mineral oil pretreatment system of the present invention, wherein: One side of the floating guide plate is connected with a pin shaft, a groove matching the pin shaft is opened on the inner wall of the stirring blade, the floating guide plate is pin-connected in the groove, and a guiding inclined surface is opened on one side of the floating guide plate.

[0010] As an alternative solution of the waste mineral oil pretreatment system of the present invention, wherein: A first filter plate is arranged inside the stirring tank and below the liquid outlet, fixing plates are symmetrically arranged below the first filter plate, and a first spring is connected between the fixing plate and the first filter plate.

[0011] As an alternative solution of the waste mineral oil pretreatment system of the present invention, wherein: A dredging rod is arranged on the bottom surface of a group of the first filter plates located inside the stirring tank and close to the tank bottom, and a ball head is arranged between the dredging rod and the first filter plate.

[0012] As an alternative solution of a waste mineral oil pretreatment system according to the present invention, wherein: a cleaning component is arranged in the filtering tank, the cleaning component includes a moving ring sliding on the inner wall of the filtering tank, the moving ring is connected to the inner top of the filtering tank through a second spring, and a connecting bracket is connected between the second spring and the moving ring;

[0013] The cleaning component further includes a winding component for driving the moving ring to move downward, the winding component includes a rotating shaft and an impeller installed on the rotating shaft, fixing sleeves are symmetrically arranged at both ends of the rotating shaft, the fixing sleeves are fixedly connected to the inner wall of the filtering tank, and a towing rope is connected between the rotating shaft and the connecting bracket.

[0014] As an alternative solution of a waste mineral oil pretreatment system according to the present invention, wherein: one group of the second filter plates is arranged below the impeller, the high-pressure pipeline penetrates through the filtering tank and extends above the second filter plate, a liquid spraying port is opened at one end of the high-pressure pipeline, and the liquid spraying port is directly below the impeller.

[0015] As an alternative solution of a waste mineral oil pretreatment system according to the present invention, wherein: an anti-blocking component is arranged between the rotating shaft and the second filter plate, the anti-blocking component includes a gear connected to the rotating shaft, a rack is slidably connected in the filtering tank through a limiting frame, a connecting plate is arranged on one side of the rack, the connecting plate is slidably connected to the limiting frame, a brush plate is connected to the bottom of the rack, and the brush plate is arranged in a fitting manner with the second filter plate.

[0016] As an alternative solution of a waste mineral oil pretreatment system according to the present invention, wherein: an exhaust valve is communicated with the top of the stirring tank, a filter element is connected to the bottom of the exhaust valve inside the stirring tank, a cleaning ring is slidably connected to the surface of the filter element, the cleaning ring is fixedly connected to a first filter plate located at the inner top of the stirring tank, and a connecting rod is connected between the cleaning ring and the first filter plate.

[0017] The present invention has the following beneficial effects:

[0018] 1. For the waste mineral oil pretreatment system, by arranging stirring blades with a special structure, specifically, a liquid guiding groove is opened in the stirring blade, the liquid guiding groove is communicated with a liquid outlet at one end of the stirring blade, and a floating flow guiding plate is arranged in the liquid guiding groove to guide the waste mineral oil in the stirring state. When the waste mineral oil impacts the floating flow guiding plate, larger particles can be broken up by the force, and the flowing time of the waste mineral oil in the liquid guiding groove is prolonged, ensuring the effect of the stirring blade. Cooperating with the air delivery pipe to inject hot steam into the stirring tank, heating and stirring of the waste mineral oil are realized, which not only improves the processing efficiency but also ensures the uniform treatment of the waste mineral oil;

[0019] 2. The waste mineral oil pretreatment system filters the heavy component oil by setting two groups of second filter plates at the bottom of the filter tank to prevent it from sinking and flowing back into the high-pressure pipeline. The second filter plate at the bottom of the filter tank is used to filter the light component oil to prevent it from entering the flash evaporation tower, so as to filter the stirred waste mineral oil and ensure the extraction purity after flash evaporation.

[0020] 3. The waste mineral oil pretreatment system sets a moving ring and a traction component. The waste mineral oil sprayed from the liquid spraying port of the high-pressure pipeline impacts the impeller, and the impeller drives the rotating shaft to rotate, thereby winding up the traction rope and driving the moving ring at the top to move down, scraping the inner wall of the filter tank to avoid impurity adhesion and ensure the filtering effect of the filter tank.

[0021] 4. The waste mineral oil pretreatment system sets a cleaning component. A gear is arranged on the surface of the rotating shaft. Connecting plates connected by sliding are symmetrically arranged on the inner wall of the filter tank. A rack is installed on one side of the connecting plate. The rack meshes with the gear. During the rotation of the gear, the rack and the brush plate at its bottom move on the surface of the second filter plate to clean the second filter plate, prevent the second filter plate from being blocked, and avoid the impurities in the subsequent oil liquid from not being separated by the second filter plate. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a three-dimensional structure diagram of the present invention.

[0023] Figure 2 It is a three-dimensional sectional structure diagram of the stirring tank of the present invention.

[0024] Figure 3 It is a three-dimensional structure diagram of the stirring blade of the present invention.

[0025] Figure 4 It is of the present invention Figure 3 The enlarged structure diagram of part A.

[0026] Figure 5 It is a three-dimensional structure diagram of the bottom inside the stirring tank of the present invention.

[0027] Figure 6 It is a diagram of the internal structure of the filter tank of the present invention.

[0028] Figure 7 It is of the present invention Figure 6 The enlarged structure diagram of part B.

[0029] Figure 8 It is a three-dimensional structure diagram related to the exhaust valve of the present invention.

[0030] In the figure: 1, stirring tank; 2, tank cover; 3, motor; 4, stirring shaft; 5, stirring blade; 6, shaft sleeve; 7, liquid guide groove; 8, liquid outlet; 9, floating guide plate; 10, guide inclined plane; 11, pin shaft; 12, first filter plate; 13, first spring; 14, fixing plate; 15, dredging rod; 16, air pump; 17, air delivery pipe; 18, filter tank; 19, ball head; 20, high-pressure pipeline; 21, liquid spraying port; 22, second filter plate; 23, impeller; 24, towing rope; 25, moving ring; 26, second spring; 27, connecting bracket; 28, rack; 29, connecting plate; 30, limiting frame; 31, brush plate; 32, flash evaporation tower; 33, exhaust valve; 34, filter element; 35, cleaning ring; 36, connecting rod; 37, gear; 38, rotating shaft; 39, fixing sleeve. Specific implementation mode

[0031] 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.

[0032] Example 1, please refer to Figures 1 to 8 , the present invention discloses a waste mineral oil pretreatment system, including a stirring tank 1 and a flash evaporation tower 32. One side of the stirring tank 1 is communicated with an air pump 16. The air pump 16 conveys heated steam into the stirring tank 1 through an air delivery pipe 17 and pumps hot air into the stirring tank 1 under high pressure;

[0033] In this embodiment, an air pump 16 is arranged on one side of the stirring tank 1. The raw waste mineral oil is pumped from the storage tank into the stirring tank 1 by an oil pump, and the air pump 16 is started to pump heated steam into the stirring tank 1 to heat the waste mineral oil.

[0034] A tank cover 2 is arranged on the top of the stirring tank 1. A motor 3 is fixed on the tank cover 2. The output shaft end of the motor 3 is connected with a stirring shaft 4. Shaft sleeves 6 are equidistantly arrayed on the surface of the stirring shaft 4, and stirring blades 5 are equidistantly arrayed on the outer circle of the shaft sleeve 6.

[0035] In this embodiment, a stirring assembly is arranged in the stirring tank 1 to stir and mix the waste mineral oil in the stirring tank 1. Cooperating with the above-mentioned hot steam, the stirring effect is improved, ensuring that the waste mineral oil is evenly heated during the treatment process, thereby improving the processing efficiency and quality.

[0036] A liquid guide groove 7 is provided on one side of the stirring blade 5, one end of the liquid guide groove 7 is located at the tail of the stirring blade 5 and is connected to a liquid outlet 8, and floating guide plates 9 are arranged in an equidistant array in the liquid guide groove 7. A pin shaft 11 is connected to one side of the floating guide plate 9, a groove matching the pin shaft 11 is provided on the inner wall of the stirring blade 5, the floating guide plate 9 is pinned in the groove, and a guide slope 10 is provided on one side of the floating guide plate 9.

[0037] In this embodiment, the stirring blade 5 is set to a special structure, wherein a liquid guide groove 7 is opened in the stirring blade 5. The waste mineral oil in the stirring tank 1 is impacted by the floating guide plate 9 with an equidistant array and then discharged through the liquid outlet 8. At the same time, a pin shaft 11 is arranged between the floating guide plate 9 and the liquid guide groove 7. When the waste mineral oil and the floating guide plate 9 collide, larger particles can be broken up by force, and the flow time of the waste mineral oil in the liquid guide groove 7 is extended, thereby ensuring the effect of the stirring blade 5. In conjunction with the air pipe 17, hot steam is injected into the stirring tank 1 to achieve heating and stirring of the waste mineral oil, which not only improves the processing efficiency, but also ensures the uniform treatment of the waste mineral oil.

[0038] Example 2: This example is an explanation based on Example 1. For details, please refer to Figures 1 to 8 A first filter plate 12 is arranged in the stirring tank 1 and below the liquid outlet 8, a fixing plate 14 is symmetrically arranged below the first filter plate 12, and a first spring 13 is connected between the fixing plate 14 and the first filter plate 12. A dredging rod 15 is arranged on the bottom surface of a group of first filter plates 12 located in the stirring tank 1 and close to the tank bottom, and a ball head 19 is arranged between the dredging rod 15 and the first filter plate 12.

[0039] There are first filter plates 12 arranged in an equidistant array in the stirring tank 1, and the first filter plates 12 are mesh plates with a hollow structure, which are arranged below the liquid outlet 8. The stirring blades 5 throw the waste mineral oil out through the liquid guide groove 7 and the liquid outlet 8 during the stirring process, and impact the surface of the first filter plate 12 under the centrifugal force, which can not only filter the impurities in the waste mineral oil, but also use the centrifugal force to break the large particles in the waste mineral oil, so as to ensure that the waste mineral oil is mixed evenly and heated evenly.

[0040] It should be noted that the first filter plate 12 and the stirring tank 1 are elastically connected via the first spring 13 and the fixing plate 14. Under the action of centrifugal force, the first filter plate 12 can float up and down in the stirring tank 1, thereby further enhancing the mixing effect of the waste mineral oil in the stirring tank 1.

[0041] Example 3: This example is an explanation based on Example 1. For details, please refer to Figures 1 to 8, a filter tank 18 is provided between the stirring tank 1 and the flash evaporation tower 32. The filter tank 18 is communicated with the stirring tank 1 and the flash evaporation tower 32 respectively through a high-pressure pipeline 20 with a valve. Two groups of second filter plates 22 are arranged at the top and the bottom inside the filter tank 18. One end of the high-pressure pipeline 20 extends into the filter tank 18 and penetrates through the second filter plate 22 located at the bottom inside the filter tank 18;

[0042] In this embodiment, a filter tank 18 is arranged between the stirring tank 1 and the flash evaporation tower 32 to filter the waste mineral oil before flash evaporation and ensure the extraction purity after flash evaporation. Specifically, the heated and mixed waste mineral oil is pumped into the filter tank 18 through the high-pressure pipeline 20, and the second filter plate 22 arranged at the bottom inside the filter tank 18 is used to filter the heavy component oil liquid to prevent it from sinking and flowing back into the high-pressure pipeline 20, and the second filter plate 22 arranged at the top inside the filter tank 18 is used for filtration to prevent the light component oil liquid from entering the flash evaporation tower 32.

[0043] Embodiment 4 is an explanatory description based on Embodiment 1. Specifically, please refer to Figures 1 to 8 , a cleaning component is arranged inside the filter tank 18. The cleaning component includes a moving ring 25 sliding on the inner wall of the filter tank 18. The moving ring 25 is connected to the top inside the filter tank 18 through a second spring 26. A connecting bracket 27 is connected between the second spring 26 and the moving ring 25; the cleaning component further includes a winding component for driving the moving ring 25 to move downward. The winding component includes a rotating shaft 38 and an impeller 23 installed on the rotating shaft 38. Fixed sleeves 39 are symmetrically arranged at both ends of the rotating shaft 38. The fixed sleeves 39 are fixedly connected to the inner wall of the filter tank 18. A towing rope 24 is connected between the rotating shaft 38 and the connecting bracket 27. The high-pressure pipeline 20 penetrates through the filter tank 18 and extends above the second filter plate 22. A liquid spraying port 21 is opened at one end of the high-pressure pipeline 20. The liquid spraying port 21 is located directly below the impeller 23; one group of second filter plates 22 is arranged below the impeller 23.

[0044] In this embodiment, considering that during the long-term use of the filter tank 18, a large amount of filter impurities will remain on the inner wall of the filter tank 18, which will have a certain impact on the subsequent filtration accuracy. Therefore, a cleaning component is arranged in the filter tank 18. During specific treatment, the waste mineral oil sprayed through the liquid spraying port 21 of the high-pressure pipeline 20 impacts the impeller 23, and the impeller 23 drives the rotating shaft 38 to rotate, thereby winding the towing rope 24 and driving the moving ring 25 at the top to move downward to scrape the inner wall of the filter tank 18, avoiding the attachment of impurities and ensuring the filtering effect of the filter tank 18.

[0045] It should be noted that the impact force of the oil pump-in is adjustable. With the adjustment of the impact force, the confrontation between the winding force and the telescopic force of the second spring 26 can achieve the up-and-down reciprocating movement of the moving ring 25. After stopping the pump-in of the oil, the second spring 26 loses the traction force of the traction rope 24 and resets.

[0046] Embodiment Five. This embodiment is an explanatory description based on Embodiment One. Specifically, please refer to Figures 1 to 8 , there is an anti-blocking component arranged between the rotating shaft 38 and the second filter plate 22. The anti-blocking component includes a gear 37 connected to the rotating shaft 38. A rack 28 is slidably connected in the filter tank 18 through a limiting frame 30. A connecting plate 29 is arranged on one side of the rack 28. The connecting plate 29 is slidably connected to the limiting frame 30. The bottom of the rack 28 is connected to a brush plate 31. The brush plate 31 is arranged in a fitting manner with the second filter plate 22.

[0047] In this embodiment, a gear 37 is arranged on the surface of the rotating shaft 38. By symmetrically arranging sliding-connected connecting plates 29 in the filter tank 18, a rack 28 is installed on one side of the connecting plate 29. The rack 28 meshes with the gear 37. During the rotation of the gear 37, it drives the rack 28 and the brush plate 31 at its bottom to move on the surface of the second filter plate 22, cleaning the second filter plate 22, preventing the second filter plate 22 from being blocked, and avoiding the situation that impurities in the subsequent oil cannot be separated by the second filter plate 22.

[0048] It should be noted that the waste mineral oil accumulated between the second filter plate 22 at the bottom of the filter tank 18 and the bottom of the filter tank 18 is filtered and may be pumped into the flash tower 32 through another set of pipelines to avoid waste.

[0049] Embodiment Six. This embodiment is an explanatory description based on Embodiment One. Specifically, please refer to Figures 1 to 8 , an exhaust valve 33 is connected and arranged at the top of the mixing tank 1. The bottom of the exhaust valve 33 is connected to a filter element 34 inside the mixing tank 1. A cleaning ring 35 is slidably connected to the surface of the filter element 34. The cleaning ring 35 is fixedly connected to the first filter plate 12 at the top inside the mixing tank 1. A connecting rod 36 is connected between the cleaning ring 35 and the first filter plate 12.

[0050] In this embodiment, considering that the air pump 16 continuously pumps hot steam into the mixing tank 1, which will cause the pressure in the mixing tank 1 to increase. Therefore, an exhaust valve 33 is arranged at the top inside the mixing tank 1. However, the exhaust valve 33 is connected to a filter element 34, and impurities will accumulate on the filter element 34 during long-term use, affecting the exhaust of the mixing tank 1. Therefore, the floating first filter plate 12 drives the connecting rod 36 to drive the cleaning ring 35 to reciprocate on the filter element 34, thereby continuously cleaning the filter element 34, ensuring the normal exhaust of the mixing tank 1, and ensuring the pressure balance of the mixing tank 1.

[0051] It should be noted that in this article, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements not only includes those elements, but also includes other elements not expressly listed, or elements inherent to such process, method, article or device.

[0052] The above are only the preferred embodiments of the present invention. It should be pointed out that for those of ordinary skill in the art, without departing from the technical principle of the present invention, several improvements and refinements can be made, and these improvements and refinements should also be regarded as the protection scope of the present invention.

Claims

1. A waste mineral oil pretreatment system, comprising a stirring tank (1) and a flash tower (32), characterized in that: A filter tank (18) is provided between the stirring tank (1) and the flash evaporation tower (32); One side of the stirring tank (1) is communicated with an air pump (16). The air pump (16) conveys heated steam into the stirring tank (1) through an air delivery pipe (17), and pumps hot air into the stirring tank (1) under high pressure; The filter tank (18) is communicated with the stirring tank (1) and the flash evaporation tower (32) respectively through a high-pressure pipeline (20) with a valve; Two groups of second filter plates (22) are arranged at the top and bottom inside the filter tank (18). One end of the high-pressure pipeline (20) extends into the filter tank (18) and penetrates through the second filter plate (22) located at the bottom inside the filter tank (18).

2. The pretreatment system for waste mineral oil according to claim 1, wherein: A tank cover (2) is arranged at the top of the stirring tank (1). A motor (3) is fixed on the tank cover (2). The output shaft end of the motor (3) is connected with a stirring shaft (4). Stirring sleeves (6) are equidistantly arranged in an array on the surface of the stirring shaft (4). Stirring blades (5) are equidistantly arranged in an array on the outer circle of the stirring sleeve (6).

3. The pretreatment system for waste mineral oil according to claim 2, wherein: A liquid guide groove (7) is formed on one side inside the stirring blade (5). One end of the liquid guide groove (7) is located at the tail of the stirring blade (5) and is communicated with a liquid outlet (8). Floating guide plates (9) are equidistantly arranged in an array in the liquid guide groove (7).

4. The pretreatment system for waste mineral oil according to claim 3, wherein: One side of the floating guide plate (9) is connected with a pin shaft (11). A groove matching with the pin shaft (11) is formed on the inner wall of the stirring blade (5). The floating guide plate (9) is pin-connected in the groove. A guide slope (10) is formed on one side of the floating guide plate (9).

5. The waste mineral oil pretreatment system according to claim 3, wherein: A first filter plate (12) is arranged inside the stirring tank (1) and below the liquid outlet (8). Fixed plates (14) are symmetrically arranged below the first filter plate (12). A first spring (13) is connected between the fixed plate (14) and the first filter plate (12).

6. The waste mineral oil pretreatment system according to claim 5, wherein: A dredging rod (15) is arranged on the bottom surface of the first filter plate (12) of a group located inside the stirring tank (1) and close to the tank bottom. A ball head (19) is arranged between the dredging rod (15) and the first filter plate (12).

7. A waste mineral oil pretreatment system according to claim 1, characterized in that: A cleaning component is arranged inside the filter tank (18). The cleaning component includes a moving ring (25) sliding on the inner wall of the filter tank (18). The moving ring (25) is connected to the top inside the filter tank (18) through a second spring (26). A connecting bracket (27) is connected between the second spring (26) and the moving ring (25); The cleaning component further includes a winding component for driving the moving ring (25) to move downward. The winding component includes a rotating shaft (38) and an impeller (23) installed on the rotating shaft (38). Fixed sleeves (39) are symmetrically arranged at both ends of the rotating shaft (38). The fixed sleeves (39) are fixedly connected to the inner wall of the filter tank (18). A traction rope (24) is connected between the rotating shaft (38) and the connecting bracket (27).

8. The pretreatment system for waste mineral oil according to claim 7, characterized in that: One set of the second filter plate (22) is arranged below the impeller (23). The high-pressure pipeline (20) penetrates through the filter tank (18) and extends above the second filter plate (22). One end of the high-pressure pipeline (20) is provided with a liquid spraying port (21), and the liquid spraying port (21) is located directly below the impeller (23).

9. The pretreatment system for waste mineral oil according to claim 8, wherein: An anti-blocking component is arranged between the rotating shaft (38) and the second filter plate (22). The anti-blocking component includes a gear (37) connected to the rotating shaft (38). A rack (28) is slidably connected in the filter tank (18) through a limiting frame (30). A connecting plate (29) is arranged on one side of the rack (28). The connecting plate (29) is slidably connected to the limiting frame (30). The bottom of the rack (28) is connected with a brush plate (31), and the brush plate (31) is arranged in a fitting manner with the second filter plate (22).

10. A waste mineral oil pretreatment system according to claim 1, characterized in that: An exhaust valve (33) is connected to the top of the mixing tank (1) in a communicating manner. A filter element (34) is connected to the bottom of the exhaust valve (33) inside the mixing tank (1). A cleaning ring (35) is slidably connected to the surface of the filter element (34). The cleaning ring (35) is fixedly connected to the first filter plate (12) at the top inside the mixing tank (1). A connecting rod (36) is connected between the cleaning ring (35) and the first filter plate (12).

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