Moving bed type oil product purification device and oil product purification method

Abstract

The invention provides a moving bed type oil product purification device and an oil product purification method, belongs to the field of waste oil recycling, and can solve the problems of resource waste and environment pollution in the existing oil product treatment mode. The purifying device comprises an oil product filtering and purifying unit, a filter material recycling and cleaning unit and a filter material conveying unit, two-phase solid particle impurities in the oil product to be purified are filtered through the oil product filtering and purifying unit; the polluted filter material is cleaned through the filter material recycling and cleaning unit; the cleaned filter material is conveyed to the oil product filtering and purifying unit again through the filter material conveying unit to be recycled, and meanwhile, the backwash liquid remaining in the cleaned filter material is recycled. The moving bed type oil product purification device provided by the invention realizes circulating conveying of the filter material, so that the filtering process of oil products such as dirty oil and catalytic cracking oil slurry and the backwashing process of the filter material are synchronously carried out, the problem of filter screen blockage in the oil product filtering and purifying process is effectively avoided, and the oil product purification efficiency is improved.

Description

Technical Field

[0001] The present invention belongs to the environmental protection technical fields such as waste oil recycling and high-value utilization of catalytic cracking slurry, and particularly relates to a moving bed type oil purification device and an oil purification method. Background Art

[0002] During the processes of petroleum and machining, a large amount of waste oils such as contaminated oil and catalytic cracking slurry will be generated. Commonly included are lubricating oil and mechanical contaminated oil during machining, floor oil and waste oil from oil fields, refineries, ships or other industrial sites, and catalytic cracking slurry from catalytic cracking units, mainly referring to the two-phase impurities such as water, dust, metal powder generated by mechanical part wear, and catalyst particles mixed in during production and use.

[0003] At present, the above-mentioned oils are basically treated by combustion, resulting in waste of resources. For example, catalytic cracking slurry can be used as a production raw material for high-value products such as needle coke and carbon black. If it is directly discharged into the environment, it will cause great harm to the environment. Therefore, such oils must be purified and recycled after treatment.

[0004] In view of the problems of the prior art, the present invention provides a moving bed type oil purification device. Summary of the Invention

[0005] In view of the technical problems of resource waste and environmental pollution existing in the existing oil treatment methods, the present invention provides a moving bed type oil purification device and an oil purification method. Through the cyclic transportation of filter media, the filtration process of the oil to be purified and the backwashing process of the filter media are synchronized, and at the same time, the filter screen during the oil filtration and purification process will not be blocked, improving the oil purification efficiency.

[0006] In order to achieve the above object, the technical solution adopted by the present invention is as follows:

[0007] A moving bed type oil purification device, comprising:

[0008] An oil filtration and purification unit, which includes a filter, a storage tank for the oil to be purified, and a storage tank for clean oil. The inlet and outlet of the filter are respectively connected to the storage tank for the oil to be purified and the storage tank for clean oil through oil pipelines. The filter is provided with filter media to filter two-phase solid particle impurities in the oil to be purified;

[0009] A filter media recovery and cleaning unit, which includes a cleaning tank, a backwashing liquid storage tank, and a post-backwashing liquid storage tank. The backwashing liquid inlet and outlet of the cleaning tank are respectively connected to the backwashing liquid storage tank and the post-backwashing liquid storage tank through liquid pipelines; the cleaning tank is connected to the discharge port of the filter through a pipeline, so that the contaminated filter media enters the cleaning tank, and the contaminated filter media is cleaned by the backwashing liquid in the cleaning tank;

[0010] A filter media conveying unit, which includes a screw conveyor and a backwash liquid recovery tank. The washed filter media flows out of the washing tank and is conveyed to the filter through the screw conveyor. The backwash liquid recovery tank is connected to the screw conveyor to recover the backwash liquid after drying and condensing the washed filter media.

[0011] In one embodiment, the filter is a moving bed filter.

[0012] In one embodiment, the oil to be purified flows from the oil storage tank to be purified into the filter through the oil inlet in the middle of the filter via an oil pipeline for filtration and purification. The purified oil flows into the clean oil storage tank through the oil outlet at the top of the filter via an oil pipeline.

[0013] A first metering pump, a first flowmeter and an inlet oil pressure gauge are installed on the oil pipeline between the oil inlet and the oil storage tank to be purified. The inlet oil pressure gauge is used to detect the oil pressure entering the filter during the oil filtration process. An outlet oil pressure gauge is installed on the oil pipeline between the oil outlet and the clean oil storage tank. The outlet oil pressure gauge is used to detect the oil pressure flowing out of the filter during the oil filtration process.

[0014] In one embodiment, one end of the oil pipeline between the oil inlet and the oil storage tank to be purified extends into the filter, and an oil distributor is arranged at the end of the oil pipeline entering the filter interior.

[0015] In one embodiment, the oil distributor is arranged at the bottom inside the filter and buried in the filter media. The oil to be purified is introduced into the filter by the first metering pump, and then is evenly distributed in the cross-section at the bottom of the filter through the oil distributor and comes into full contact with the filter media. The oil to be purified flows upward from the bottom of the filter, and the filter media flows downward inside the filter. The two contact reversely to achieve oil filtration. The purified oil enters the clean oil storage tank through the oil outlet.

[0016] In one embodiment, the contaminated filter media flows out of the discharge port opened at the bottom of the filter and then flows into the washing tank from the top through a pipeline. The backwash liquid enters from the backwash liquid inlet at the bottom of the washing tank through an infusion pipeline. A second metering pump and a second flowmeter are arranged on the infusion pipeline.

[0017] A liquid distributor is arranged at the end of the infusion pipeline entering the washing tank. The liquid distributor is located at the bottom of the washing tank and buried in the filter media. A clean filter media outlet is also arranged at the bottom of the washing tank. The washed filter media flows out through the clean filter media outlet.

[0018] In one embodiment, the backwash liquid is drawn from the backwash liquid storage tank by a second metering pump, and then evenly distributed within the cross-section of the bottom of the cleaning tank through the liquid distributor and comes into full contact with the filter media. The backwash liquid flows upward from the bottom of the cleaning tank, and the contaminated filter media moves downward under the action of gravity. The two contact reversely to achieve the cleaning of the filter media. The backwash liquid for cleaning the contaminated filter media flows out from the top of the cleaning tank through the backwash liquid outlet and enters the post-backwash liquid storage tank. The cleaned filter media flows out from the bottom of the cleaning tank through the clean filter media outlet and enters the filter media conveying unit.

[0019] In one embodiment, the filter media conveying unit further includes a combustion heater and a condenser. The combustion heater is used to dry the filter media in the screw conveyor, and the condenser is used to cool and collect the backwash liquid evaporated from the filter media. The condensed backwash liquid is conveyed to the backwash liquid recovery tank.

[0020] The cleaned filter media flows into the screw conveyor from the bottom of the cleaning tank and is conveyed into the filter through the screw conveyor. The backwash liquid carried by the filter media during the conveying process evaporates under the action of high temperature.

[0021] In one embodiment, the filter media is selected from any one of ceramsite, rare earth porcelain sand, garnet or quartz sand, and the particle size of the filter media is in millimeters and below; the backwash liquid is an organic medium, and the organic medium is selected from diesel or ether; the oil to be purified includes waste oil and / or catalytic cracking slurry.

[0022] The present invention also provides an oil purification method, which is carried out by using the moving bed type oil purification device described in any one of the above embodiments, and includes the following steps:

[0023] Oil filtration and purification step: The oil to be purified flows into the filter from the oil to be purified storage tank through the oil pipeline under the power of the first metering pump, and then is evenly distributed within the cross-section of the bottom of the filter through the liquid distributor and comes into full contact with the filter media. The oil to be purified flows upward from the bottom of the filter, and the filter media flows downward in the filter. The two contact reversely to achieve the filtration of the oil. The purified oil enters the clean oil storage tank through the oil outlet, and the contaminated filter media flows out through the bottom discharge port of the filter and enters the cleaning tank.

[0024] Filter media recovery and cleaning steps: The backwash liquid flows from the backwash liquid storage tank into the cleaning tank through the liquid delivery pipeline under the power of the second metering pump, and then is evenly distributed within the bottom cross-section of the cleaning tank through the liquid distributor and comes into full contact with the contaminated filter media. After flowing out from the bottom of the filter, the contaminated filter media flows into the cleaning tank from the top feed port through the pipeline. The backwash liquid flows upward from the bottom of the cleaning tank, and the contaminated filter media flows downward by gravity inside the cleaning tank. The two come into reverse contact to achieve the cleaning of the filter media. After cleaning the filter media, the contaminated backwash liquid flows out from the backwash liquid outlet at the top of the cleaning tank and enters the post-backwash liquid storage tank.

[0025] Filter media conveying steps: The cleaned filter media flows into the screw conveyor through the bottom discharge port of the cleaning tank and is conveyed into the filter through screw conveyance. During the conveying process, the residual backwash liquid carried by the filter media evaporates under the action of the combustion heater to further clean the filter media. The volatile components of the evaporated backwash liquid are cooled by the condenser and then conveyed to the backwash liquid recovery tank.

[0026] Compared with the prior art, the advantages and positive effects of the present invention are as follows:

[0027] 1. The present invention provides a moving bed type oil purification device. By setting up an oil filtration and purification unit, a filter media recovery and cleaning unit, and a filter media conveying unit, the circulating conveyance of the filter media is realized, and further the synchronous progress of the oil product filtration process such as waste oil and catalytic cracking slurry and the filter media backwashing process is achieved. That is, during the oil product filtration and purification process, continuously contaminated filter media flows out of the filtration tank, and continuously clean filter media enters. At the same time, the problem of filter screen blockage during the oil product filtration and purification process can be avoided, improving the oil product purification efficiency. It can be widely applied in environmental protection technical fields such as waste oil recycling and high-value utilization of catalytic cracking slurry. Brief Description of the Drawings

[0028] Figure 1 It is a schematic structural diagram of the moving bed type oil purification device provided by the embodiment of the present invention.

[0029] In the figure:

[0030] 1. Oil storage tank to be purified; 2. First metering pump; 3. First flowmeter; 4. First valve; 5. Inlet oil pressure gauge; 6. Filter; 7. Oil distributor; 8. Outlet; 9. Outlet oil pressure gauge; 10. Second valve; 11. Clean oil storage tank; 12. Discharge port; 13. Third valve; 14. Backwash liquid storage tank; 15. Second metering pump; 16. Second flowmeter; 17. Fourth valve; 18. Backwash liquid inlet; 19. Cleaning tank; 20. Liquid distributor; 21. Backwash liquid outlet; 22. Fifth valve; 23. Sixth valve; 24. Liquid storage tank after backwashing; 25. Clean filter media outlet; 26. Screw conveyor; 27. Backwash liquid recovery tank; 28. Combustion heater; 29. Condenser; 30. Seventh valve. Detailed implementation mode

[0031] The technical solutions in the embodiments of the present invention will be described clearly and completely below. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of them. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0032] The embodiment of the present invention provides a moving bed type oil purification device, attached Figure 1 is the overall structure schematic diagram according to the embodiment of the present invention. Refer to Figure 1As shown in the figure, the moving bed type oil purification device at least includes: an oil filtering and purifying unit, a filter media recovery and cleaning unit, and a filter media conveying unit; among them, the oil filtering and purifying unit includes a filter 6, a to-be-purified oil storage tank 1, and a clean oil storage tank 11. The to-be-purified oil storage tank 1 is used to store oils to be purified such as waste oil and catalytic cracking slurry. If catalytic cracking slurry is stored, this storage tank needs to have a heating function and heat preservation. The clean oil storage tank 11 is used to store purified waste oil, catalytic cracking slurry and other oils. If catalytic cracking slurry is stored, this storage tank needs to have a heating function and heat preservation. The oil inlet and the oil outlet 8 of the filter 6 are respectively connected to the to-be-purified oil storage tank 1 and the clean oil storage tank 11 through oil pipelines. The filter 6 is provided with filter media to filter two-phase solid particle impurities in the to-be-purified oil; the filter media recovery and cleaning unit includes a cleaning tank 19, a backwashing liquid storage tank 14, and a post-backwashing liquid storage tank 24. The cleaning tank 19 is used to clean the contaminated filter media after purifying waste oil. The backwashing liquid inlet 18 and the backwashing liquid outlet 21 of the cleaning tank 19 are respectively connected to the backwashing liquid storage tank 14 and the post-backwashing liquid storage tank 24 through liquid pipelines; the cleaning tank 19 is connected to the discharge port 12 of the filter 6 through a pipeline, so that the contaminated filter media enters the cleaning tank 19, and the contaminated filter media is cleaned by the backwashing liquid in the cleaning tank 19. The backwashing liquid storage tank 14 is used to store clean backwashing liquid, and the post-backwashing liquid storage tank 24 is used to store the backwashing liquid after cleaning the filter media; the filter media conveying unit includes a screw feeder 26 and a backwashing liquid recovery tank 27. The cleaned filter media flows out of the cleaning tank 19 and is conveyed to the filter 6 through the screw feeder 26. The backwashing liquid recovery tank 27 is connected to the screw feeder 26 to recover the backwashing liquid after drying and condensing the cleaned filter media. An embodiment of the present invention provides a moving bed type oil purification device. By setting three units, namely an oil filtering and purifying unit, a filter media recovery and cleaning unit, and a filter media conveying unit, the two-phase solid particle impurities in the to-be-purified oil (such as waste oil, catalytic cracking slurry, etc.) are filtered and purified by setting the oil filtering and purifying unit. The contaminated (adsorbing solid particle impurities) filter media is recovered, cleaned, and dried by setting the filter media recovery and cleaning unit. The cleaned and dried clean filter media is conveyed to the oil filtering and purifying unit by setting the filter media conveying unit to re-filter the to-be-purified oil. The purification device realizes the cyclic conveying of the filter media, and further realizes the synchronous progress of the oil filtering process and the filter media backwashing process for oils such as waste oil and catalytic cracking slurry. That is, during the oil filtering and purifying process, continuously contaminated filter media flows out of the filtering tank, and continuously clean filter media enters. At the same time, it can also avoid the problem of filter screen blockage during the oil filtering and purifying process, and improve the oil purification efficiency.

[0033] In a specific embodiment, the filter 6 is a moving bed type filter, which is used to filter and purify oils such as waste oil and catalytic cracking slurry flowing through.

[0034] In a specific embodiment, the oil product to be purified flows from the oil product storage tank 1 to be purified into the filter 6 through the oil inlet in the middle of the oil pipeline through the filter 6 for filtration and purification treatment. After purification, the oil product flows into the clean oil storage tank 11 through the oil outlet 8 at the top of the filter 6 through the oil pipeline;

[0035] On the oil pipeline between the oil inlet and the oil product storage tank 1 to be purified, a first metering pump 2, a first flowmeter 3, a first valve 4 and an inlet oil pressure gauge 5 are sequentially installed along the direction of oil product flow. The inlet oil pressure gauge 5 is used to detect the oil pressure of the oil product entering the filter 6 during the oil product filtration process, so as to achieve the purpose of controlling and adjusting the filtration effect. On the oil pipeline between the oil outlet 8 and the clean oil storage tank 11, an outlet oil pressure gauge 9 and a second valve 10 are sequentially installed along the direction of oil product flow. The outlet oil pressure gauge 9 is used to detect the oil pressure of the oil product flowing out of the filter 6 during the oil product filtration process.

[0036] In a specific embodiment, one end of the oil pipeline between the oil inlet and the oil product storage tank 1 to be purified extends into the filter 6, and a distributor 7 is arranged at the end of the oil pipeline entering the filter 6.

[0037] In a specific embodiment, the distributor 7 is arranged at the bottom inside the filter 6 and buried in the filter material. The oil product to be purified is introduced into the filter 6 by the first metering pump 2, and then evenly distributed in the bottom cross-section of the filter 6 through the distributor 7 and fully contacts with the filter material. The oil product to be purified flows upward from the bottom of the filter 6, and the filter material flows downward in the filter 6. The two contact reversely to achieve oil product filtration. After purification, the oil product enters the clean oil storage tank 11 through the oil outlet 8.

[0038] In a specific embodiment, the contaminated filter material flows out from the discharge port 12 opened at the bottom of the filter 6 and then flows into the top of the cleaning tank 19 through the pipeline. A third valve 13 is installed on the pipeline. The backwashing liquid enters from the backwashing liquid inlet 18 at the bottom of the cleaning tank 19 through the infusion pipeline. On the infusion pipeline, a second metering pump 15, a second flowmeter 16 and a fourth valve 17 are sequentially installed along the direction of backwashing liquid flow. On the infusion pipeline between the cleaning tank 19 and the backwashed liquid storage tank 24, a fifth valve 22 and a sixth valve 23 are installed side by side along the direction of ether flow;

[0039] A liquid distributor 20 is arranged at the end of the infusion pipeline entering the cleaning tank 19. The liquid distributor 20 is located at the bottom of the cleaning tank 19 and buried in the filter material. A clean filter material outlet 25 is also arranged at the bottom of the cleaning tank 19. The cleaned filter material flows out through the clean filter material outlet 25, and a seventh valve 30 is also installed on the pipeline connected to the clean filter material outlet 25.

[0040] In a specific embodiment, the backwash liquid is led out from the backwash liquid storage tank 14 by the second metering pump 15, and then evenly distributed in the bottom cross-section of the cleaning tank 19 through the liquid distributor 20 and comes into full contact with the filter media. The backwash liquid flows upward from the bottom of the cleaning tank 19, and the contaminated filter media moves downward under the action of gravity. The two contact reversely to achieve the cleaning of the filter media. The backwash liquid for cleaning the contaminated filter media flows out from the top of the cleaning tank 19 through the backwash liquid outlet 21 and enters the post-backwash liquid storage tank 24. The cleaned filter media flows out from the bottom of the cleaning tank 19 through the clean filter media outlet 25 and enters the filter media conveying unit.

[0041] In a specific embodiment, the filter media conveying unit further includes a combustion heater 28 and a condenser 29. The combustion heater 28 is used to dry the filter media in the screw conveyor 26, and the condenser 29 is used to cool and collect the backwash liquid evaporated from the filter media. The condensed backwash liquid is conveyed to the backwash liquid recovery tank 27.

[0042] The cleaned filter media flows into the screw conveyor 26 from the bottom of the cleaning tank 19 and is conveyed by the screw into the filter 6. The backwash liquid carried by the filter media during the conveying process evaporates under the action of high temperature.

[0043] In a specific embodiment, the filter media is selected from any one of ceramsite, rare earth porcelain sand, garnet or quartz sand, and the particle size of the filter media is in millimeters and below; the backwash liquid is an organic medium, and the organic medium is selected from diesel or ether; the oil to be purified includes but is not limited to waste oil and / or catalytic cracking slurry.

[0044] The embodiment of the present invention also provides an oil purification method using the moving bed type oil purification device listed in any of the above embodiments, including the following steps:

[0045] S1. Oil filtration and purification step: The oil to be purified flows from the oil storage tank 1 to be purified into the filter 6 under the power of the first metering pump 2 through the oil pipeline, and then is evenly distributed in the bottom cross-section of the filter 6 through the oil distributor 7 and comes into full contact with the filter media. The oil to be purified flows upward from the bottom of the filter 6, and the filter media flows downward in the filter 6. The two contact reversely to achieve the filtration of the oil. The purified oil enters the clean oil storage tank 11 through the oil outlet 8, and the contaminated filter media flows out through the bottom discharge port 12 of the filter 6 and enters the cleaning tank 19.

[0046] S2. Filter media recovery and cleaning step: Driven by the second metering pump 15, the backwash liquid flows from the backwash liquid storage tank 14 into the cleaning tank 19 through the liquid delivery pipeline, and then is evenly distributed across the bottom cross-section of the cleaning tank 19 via the liquid distributor 20 and comes into full contact with the contaminated filter media. After flowing out from the bottom of the filter 6, the contaminated filter media enters from the top feed port of the cleaning tank 19 through the pipeline. The backwash liquid flows upward from the bottom of the cleaning tank 19, while the contaminated filter media flows downward by gravity inside the cleaning tank 19. The two contact reversely to achieve the cleaning of the filter media. After cleaning the filter media, the contaminated backwash liquid flows out from the backwash liquid outlet 21 at the top of the cleaning tank 19 and enters the post-backwash liquid storage tank 24;

[0047] S3. Filter media conveying step: The cleaned filter media flows into the screw conveyor 26 through the bottom discharge port of the cleaning tank 19 and is conveyed into the filter 6 by screw. During the conveying process, the residual backwash liquid carried by the filter media evaporates under the action of the combustion heater 28 to further clean the filter media. The volatile components of the evaporated backwash liquid are cooled by the condenser 29 and then conveyed to the backwash liquid recovery tank 27.

[0048] The technical features of the above-described embodiments can be combined arbitrarily. For the sake of brevity of description, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered as falling within the scope described in this specification.

[0049] The above-described embodiments merely represent several implementation manners of the present invention. The description is relatively specific and detailed, but it should not be construed as a limitation on the scope of the invention patent. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present invention, several modifications and improvements can still be made, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the present invention patent shall be subject to the appended claims.

Claims

1. A moving bed type oil purification device, characterized in that, Comprising: An oil filtering and purifying unit, which includes a filter, a storage tank for oil to be purified, and a storage tank for clean oil. The inlet and outlet of the filter are respectively connected to the storage tank for oil to be purified and the storage tank for clean oil through oil pipelines. A filter medium is provided inside the filter to filter out two-phase solid particle impurities in the oil to be purified; A filter medium recovery and cleaning unit, which includes a cleaning tank, a backwashing liquid storage tank, and a post-backwashing liquid storage tank. The inlet and outlet of the backwashing liquid of the cleaning tank are respectively connected to the backwashing liquid storage tank and the post-backwashing liquid storage tank through a liquid pipeline; The cleaning tank is connected to the discharge port of the filter through a pipeline, so that the contaminated filter medium enters the cleaning tank, and the contaminated filter medium is cleaned by the backwashing liquid in the cleaning tank; A filter medium conveying unit, which includes a screw conveyor and a backwashing liquid recovery tank. The cleaned filter medium flows out of the cleaning tank and is conveyed to the filter through the screw conveyor. The backwashing liquid recovery tank is connected to the screw conveyor to recover the backwashing liquid after drying and condensing the cleaned filter medium.

2. The moving bed type oil purification device according to claim 1, wherein, The filter is a moving bed filter.

3. The moving bed type oil purification device according to claim 1, characterized in that, The oil to be purified flows from the storage tank for oil to be purified through an oil pipeline into the filter through the inlet in the middle of the filter for filtration and purification treatment. The purified oil flows into the storage tank for clean oil through an oil pipeline through the outlet at the top of the filter; A first metering pump, a first flow meter, and an inlet oil pressure gauge are installed on the oil pipeline between the inlet and the storage tank for oil to be purified. The inlet oil pressure gauge is used to detect the oil pressure entering the filter during the oil filtration process. An outlet oil pressure gauge is installed on the oil pipeline between the outlet and the storage tank for clean oil. The outlet oil pressure gauge is used to detect the oil pressure flowing out of the filter during the oil filtration process.

4. The moving bed type oil product purification device according to claim 3, characterized in that, One end of the oil pipeline between the inlet and the storage tank for oil to be purified extends into the filter, and a distributor is provided at the end of the oil pipeline entering the filter interior.

5. The moving bed type oil purification device according to claim 4, characterized in that, The distributor is arranged at the bottom inside the filter and buried in the filter medium. The oil to be purified is introduced into the filter by the first metering pump, and then evenly distributed in the bottom cross-section of the filter through the distributor and fully contacts with the filter medium. The oil to be purified flows upward from the bottom of the filter, and the filter medium flows downward in the filter. The two contact reversely to achieve oil filtration. The purified oil enters the storage tank for clean oil through the outlet.

6. The moving bed type oil purification device according to claim 1, characterized in that, The contaminated filter medium flows out from the discharge port opened at the bottom of the filter and then flows into the cleaning tank from the top through a pipeline. The backwashing liquid enters through the inlet of the backwashing liquid at the bottom of the cleaning tank through the liquid pipeline. A second metering pump and a second flow meter are provided on the liquid pipeline; A liquid distributor is provided at the end of the liquid pipeline entering the cleaning tank. The liquid distributor is located at the bottom of the cleaning tank and buried in the filter medium. A clean filter medium outlet is also provided at the bottom of the cleaning tank. The cleaned filter medium flows out through the clean filter medium outlet.

7. The moving bed type oil product purification device according to claim 6, characterized in that, The backwashing liquid is led out from the backwashing liquid storage tank by a second metering pump, and then evenly distributed in the bottom cross-section of the cleaning tank through the liquid distributor and is in full contact with the filter media. The backwashing liquid flows upward from the bottom of the cleaning tank, and the contaminated filter media moves downward under the action of gravity. The two contact reversely to achieve the cleaning of the filter media. The backwashing liquid for cleaning the contaminated filter media flows out from the top of the cleaning tank through the backwashing liquid outlet and enters the backwashed liquid storage tank. The cleaned filter media flows out from the bottom of the cleaning tank through the clean filter media outlet and enters the filter media conveying unit.

8. The moving bed type oil purification device according to claim 1, characterized in that, The filter media conveying unit further includes a combustion heater and a condenser. The combustion heater is used to dry the filter media in the screw conveyor, and the condenser is used to cool and collect the backwashing liquid evaporated from the filter media. The condensed backwashing liquid is conveyed to the backwashing liquid recovery tank. The cleaned filter media flows into the screw conveyor from the bottom of the cleaning tank and is conveyed into the filter through the screw conveyor. During the conveying process, the backwashing liquid carried by the filter media evaporates under the action of high temperature.

9. The moving bed type oil purification device according to claim 1, characterized in that, The filter media is selected from any one of ceramsite, rare earth porcelain sand, garnet or quartz sand, and the particle size of the filter media is in millimeters and below; the backwashing liquid is an organic medium, and the organic medium is selected from diesel or ether; the oil to be purified includes waste oil and / or catalytic cracking slurry.

10. An oil purification method, characterized in that, It is carried out by using the moving bed type oil purification device according to any one of claims 1-9, and includes the following steps: Oil filtration and purification step: The oil to be purified flows into the filter from the oil storage tank to be purified through the oil pipeline under the power of the first metering pump, and then is evenly distributed in the bottom cross-section of the filter through the liquid distributor and is in full contact with the filter media. The oil to be purified flows upward from the bottom of the filter, and the filter media flows downward in the filter. The two contact reversely to achieve the filtration of the oil. The purified oil enters the clean oil storage tank through the oil outlet, and the contaminated filter media flows out through the bottom discharge port of the filter and enters the cleaning tank. Filter media recovery and cleaning step: The backwashing liquid flows into the cleaning tank from the backwashing liquid storage tank through the liquid conveying pipeline under the power of the second metering pump, and then is evenly distributed in the bottom cross-section of the cleaning tank through the liquid distributor and is in full contact with the contaminated filter media. The contaminated filter media flows out from the bottom of the filter and then flows into the cleaning tank from the top feed port through the pipeline. The backwashing liquid flows upward from the bottom of the cleaning tank, and the contaminated filter media flows downward by gravity inside the cleaning tank. The two contact reversely to achieve the cleaning of the filter media. The contaminated backwashing liquid after cleaning the filter media flows out from the backwashing liquid outlet at the top of the cleaning tank and enters the backwashed liquid storage tank. Filter media conveying step: The cleaned filter media flows into the screw conveyor through the bottom discharge port of the cleaning tank and is conveyed into the filter through the screw conveyor. During the conveying process, the residual backwashing liquid carried by the filter media evaporates under the action of the combustion heater to further clean the filter media. The volatile component of the evaporated backwashing liquid is cooled by the condenser and then conveyed to the backwashing liquid recovery tank.

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