CN115477459B

CN115477459B - Fatlute processing system

Info

Publication number: CN115477459B
Application number: CN202211168701.7A
Authority: CN
Inventors: 刘哲锋; 梁鹏
Original assignee: Shaanxi Aishu Machinery Manufacturing Co ltd
Current assignee: Shaanxi Aishu Machinery Manufacturing Co ltd
Filing date: 2022-09-24
Publication date: 2024-06-21
Anticipated expiration: 2042-09-24

Abstract

The application relates to the technical field of oil sludge treatment, in particular to an oil sludge treatment system, which comprises a pretreatment device, a water washing device, an oil-water separation device and a solid-liquid separation device which are sequentially arranged; the water washing device comprises a water washing mechanism and a precipitation layering mechanism; the washing mechanism comprises a washing tank and a stirring assembly, and the precipitation layering mechanism comprises a precipitation layering tank, a rotating shaft, a scraping plate and a motor; the sedimentation layering tank is provided with an oil outlet groove, the rotating shaft is coaxially arranged with the sedimentation layering tank, the rotating shaft is rotationally connected with the sedimentation layering tank, the scraping plate is arranged on the rotating shaft, the top wall of the scraping plate is higher than the bottom wall of the oil outlet groove, and the motor drives the rotating shaft to rotate. The water washing device is convenient for separating the mixture of the oil, the water and the mud after washing, the mixture of the oil, the water and the mud is separated into an oil-water mixture and a mud-water mixture, and then the oil-water mixture is fully separated from the water and the mud by the oil-water separation device and the solid-liquid separation device, so that the recycling rate of the oil and the mud in the oil-mud mixture is improved.

Description

Fatlute processing system

Technical Field

The application relates to the technical field of sludge treatment, in particular to a sludge treatment system.

Background

Sludge treatment refers to sludge produced during oil field production, due to crude oil extraction, storage, gathering and transportation, processing and crude oil production fluid treatment, which is distinguished by containing crude oil or some components in crude oil, and mainly comprises: floor sludge, tank sludge, flotation scum, etc.

The patent document with the application number 202110005494.2 discloses a normal temperature liquid adding and washing treatment oil sludge system, including oil sludge storage pool, shredder, screening part, normal temperature liquid adding and washing system, dosing system, buffer tank, separation system, dirty oil recovery tank, sewage circulation system, oil sludge storage pool and shredder cooperation use, screening part and shredder cooperation use, normal temperature liquid adding and washing system and screening part cooperation use, normal temperature liquid adding and washing system utilizes the tangential force that the stirring produced to wash the oily substance on the granule material through dosing, water adding and peels off, dosing system and buffer tank and normal temperature liquid adding and washing system cooperation use, dosing system is with the dosing system of preparing the medicament and driving normal temperature liquid adding and washing system through the diaphragm pump, separation system and buffer tank cooperation use, dirty oil recovery tank and sewage circulation system and separation system cooperation use, dirty oil recovery tank is the crude oil that is used for storing after the system of dosing and washing system handle and the crude oil that separates out of separation system, the sewage is that the circulation system is used for producing the sedimentation system that subsides after the normal temperature recycling system is used to the separation system.

Aiming at the related technology, the applicant considers that in the sludge treatment process, after the sludge mixed solution is introduced into water for washing, the sludge mixed solution is separated through a separation system, so that the sludge mixed solution is easy to separate incompletely, and the repetition rate utilization rate of oil and sludge in the sludge mixed solution is influenced.

Disclosure of Invention

In order to improve the recycling rate of oil and sludge in the sludge mixed solution, the application provides a sludge treatment system.

An oil sludge treatment system comprises a pretreatment device, a water washing device, an oil-water separation device and a solid-liquid separation device which are sequentially arranged;

The pretreatment device is used for primary screening of the oil sludge;

the washing device comprises a washing mechanism and at least three groups of precipitation layering mechanisms which are arranged in parallel;

The washing mechanism comprises a washing tank and a stirring assembly for stirring the oil sludge and the liquid medicine in the inner cavity of the washing tank, and the stirring assembly is arranged on the washing tank;

the sedimentation layering mechanism comprises a sedimentation layering tank, a rotating shaft, a scraping plate and a motor;

A fourth pipeline is arranged at the feed inlet of the precipitation layering tank, one end, far away from the precipitation layering tank, of the fourth pipeline is communicated with the inner cavity of the washing tank, and an oil outlet tank for discharging an oil-water mixture is arranged on the precipitation layering tank;

the rotating shaft is coaxially arranged with the precipitation layering tank, the rotating shaft is rotationally connected with the precipitation layering tank, the scraping plate is arranged on the rotating shaft and is positioned in the inner cavity of the precipitation layering tank, the top wall of the scraping plate is higher than the bottom wall of the oil outlet groove, the motor is arranged at one end of the rotating shaft extending out of the precipitation layering tank, and the motor drives the rotating shaft to rotate;

An oil drain pipe and a mud drain pipe are arranged on the precipitation layering tank, one end of the oil drain pipe is communicated with the inner cavity of the oil outlet groove, the other end of the oil drain pipe is connected with the oil-water separation device, and the oil-water separation device is used for oil-water separation in the oil-mud mixture;

One end of the mud discharging pipe is communicated with the inner cavity of the precipitation layering tank, the mud discharging pipe is close to the bottom wall of the precipitation layering tank, one end of the mud discharging pipe, which is far away from the precipitation layering tank, is connected with the solid-liquid separation device, and the solid-liquid separation device is used for solid-liquid separation in an oil sludge mixture.

Through the technical scheme, in the process of treating the oil sludge, the oil sludge is firstly subjected to primary screening through the pretreatment device, other large particles and foreign matters in the oil sludge are separated, the separated oil sludge enters the washing tank, meanwhile, liquid medicine is added into the washing tank, the oil sludge and the liquid medicine in the washing tank are fully stirred through the stirring assembly so as to fully analyze crude oil in the oil sludge, the analyzed oil sludge enters the layering tank through the fourth pipeline, the motor is regulated, the driving shaft of the motor drives the rotating shaft to rotate, the rotating shaft drives the scraping plate to move, oil floating on the upper layer of the oil sludge water mixture is scraped into the oil outlet groove, the oil sludge water mixture is separated into oil-water mixture and a mud-water mixture, the oil-water mixture flows into the oil-water mixture through the oil drain pipe, the oil-water mixture is separated through the oil-water separation device, and the mud-water mixture is discharged into the solid-liquid separation device through the mud drain pipe, and the mud and the water are separated through the separation device; the designed oil sludge treatment system is convenient for separating the mixture of the oil, the water and the sludge after washing by the water washing device, the mixture of the oil, the water and the sludge is separated into an oil-water mixed solution and a sludge-water mixture, and then the oil, the water and the sludge are fully separated by the oil-water separation device and the solid-liquid separation device, so that the recycling rate of the oil and the sludge in the oil sludge mixed solution is improved.

Optionally, the sedimentation layering mechanism further comprises an upper connecting rod, a lower connecting rod and at least one helical blade, wherein the upper connecting rod, the lower connecting rod and the helical blade are all located in the inner cavity of the sedimentation layering tank, the upper connecting rod and the lower connecting rod are both connected with the rotating shaft, the scraping plate is located above the upper connecting rod, the upper connecting rod and the lower connecting rod are both arranged along the radial direction of the rotating shaft, one end of the helical blade is connected with the upper connecting rod, and the other end of the helical blade is connected with the lower connecting rod.

By adopting the technical scheme, the motor is driven, the output shaft of the motor drives the rotating shaft to rotate, the rotating shaft drives the spiral blade to rotate, the spiral blade can fully stir oil, mud and water in the precipitation layering tank, the mixed liquid of the oil, the mud and the water after fully stirring is precipitated, the upper layer is an oil layer, the middle layer is a water layer, and the lower layer is a mud layer; the upper connecting rod and the lower connecting rod of design are convenient for fix helical blade, realize helical blade and pivot fixed connection, in addition, fully stir the fatlute water mixture through helical blade, realize the layering of oil, mud, water in the sediment layering jar.

Optionally, be provided with the support frame in the inner chamber of precipitation layering jar, the support frame with the pivot is kept away from the motor rotates and is connected, helical blade is located the support frame top.

Through adopting above-mentioned technical scheme, the support frame of design is convenient for support the pivot, avoids the pivot to keep away from motor one end and takes place the pivot swing, has prolonged washing device's life.

Optionally, a stirring blade is disposed on the rotating shaft, and the stirring blade is located between the spiral blade and the supporting frame.

Through adopting above-mentioned technical scheme, stirring vane of design is convenient for strike off the mud layer of sediment layering jar lower floor, has reduced the accumulation of mud layer in sediment layering jar bottom, and then is convenient for mud layer discharge sediment layering jar.

Optionally, the preprocessing device includes pond, first pipeline, second pipeline and vibrating mechanism of keeping in, vibrating mechanism includes shale shaker jar and at least one shale shaker, the shale shaker install in just above the shale shaker jar, just the discharge gate of shale shaker with the inner chamber intercommunication of shale shaker jar, the pond of keeping in with the shale shaker passes through first pipeline intercommunication, install first elevator pump on the first pipeline, the shale shaker jar with deposit the layering jar and pass through second pipeline intercommunication, install the second elevator pump on the second pipeline.

By adopting the technical scheme, in the sludge treatment process, the sludge stored in the temporary storage tank is regulated to enable the sludge mixed liquid in the temporary storage tank to enter the vibrating screen to separate large particles and foreign matters in the sludge, the separated sludge flows into the vibrating screen tank, and the second lifting pump is regulated to enable the sludge in the vibrating screen tank to enter the washing tank; the designed pretreatment device is convenient for carrying out primary separation on the oil sludge mixture, removing large particles and foreign matters in the oil sludge mixture, and in addition, transferring the oil sludge mixture after impurity removal into a washing tank for washing the oil sludge mixture.

Optionally, the pretreatment device further comprises a dosing system and a third pipeline, one end of the third pipeline is connected with the discharge end of the dosing system, the other end of the third pipeline is communicated with the washing tank, and a dosing pump is installed on the third pipeline.

By adopting the technical scheme, the dosing pump is regulated, and under the action of the dosing pump, the liquid medicine in the dosing system enters the washing tank along the third pipeline to realize the oiling of the oil sludge; the designed dosing system is convenient for dosing the water washing tank, and further is convenient for fully analyzing crude oil in the oil sludge.

Optionally, the oil-water separator includes first homogeneity jar, first connecting pipe, three-phase centrifuge and oil storage tank, the feed inlet of first homogeneity jar with the liquid outlet of play oil groove passes through arrange oil pipe intercommunication, the discharge gate of first homogeneity jar with three-phase centrifuge's feed inlet passes through first connecting pipe intercommunication, three-phase centrifuge's oil-out with the oil storage tank intercommunication, three-phase centrifuge's discharge gate below is provided with and is used for solid sediment collection's in the three-phase centrifuge first collection case.

By adopting the technical scheme, the oil-water mixture in the oil outlet groove flows into the first homogenizing tank along the oil drain pipe, the oil-water mixture is micronized and homogenized in the first homogenizing tank, the homogenized oil-water mixture flows into the three-phase centrifuge along the oil drain pipe, the oil, mud and water in the oil-water mixture are fully separated in the three-phase centrifuge, the oil flows into the oil storage tank along the first connecting pipe, and mud mixed in the oil-water mixture falls into the first collecting tank; the designed oil-water separation device carries out secondary separation on the oil-water mixed liquid through a three-phase centrifugal machine, so that the full separation of oil, mud and water is realized, and the recycling rate of the oil and mud in the oil-mud mixed liquid is further improved.

Optionally, the solid-liquid separation device includes second homogeneity jar, second connecting pipe and vertical centrifuge, the mud pipe is kept away from precipitation layering jar one end with the feed inlet intercommunication of second homogeneity jar, second connecting pipe one end with the bin outlet of second homogeneity jar is connected, the other end with vertical centrifuge's feed inlet intercommunication, vertical centrifuge's bin outlet below is provided with and is used for vertical centrifuge internal solid sediment collects the second collection case.

By adopting the technical scheme, the mud-water mixture in the precipitation layering tank is discharged into the second homogenizing tank along the mud discharge pipe, the mud-water mixture is homogenized in the second homogenizing tank, the homogenized mud-water mixture flows into the vertical centrifuge along the mud discharge pipe, and the vertical centrifuge flows into the second material collecting tank along the material discharge port under the action of the vertical centrifuge; the designed solid-liquid separation device is convenient for separating the mud-water mixture, realizes the separation of mud and water, and improves the recycling rate of mud in the oil-mud mixed solution.

Optionally, the liquid outlet department of three-phase centrifuge installs first drain pipe, the liquid outlet department of vertical centrifuge installs the second drain pipe, the liquid outlet of first drain pipe with the effluent water sump that is used for sewage collection is installed jointly to the liquid outlet of second drain pipe.

Through adopting above-mentioned technical scheme, the effluent water sump of design is convenient for concentrate the collection to the water in three-phase centrifuge and the vertical centrifuge, improves the reuse rate of water resource.

Optionally, the stirring assembly comprises a stirrer for stirring the liquid medicine and the oil sludge mixed liquid.

Through adopting above-mentioned technical scheme, the stirring subassembly of design, be convenient for liquid medicine, fatlute and water intensive mixing, improve the resolution efficiency of crude oil in the fatlute.

In summary, the present application includes at least one of the following beneficial technical effects:

1. The designed oil sludge treatment system is convenient for separating the mixture of the oil, the water and the sludge after water washing by the water washing device, separating the mixture of the oil, the water and the sludge into an oil-water mixed solution and a sludge water mixture, and then realizing the full separation of the oil, the water and the sludge by the oil-water separation device and the solid-liquid separation device, thereby improving the recycling rate of the oil and the sludge in the oil sludge mixed solution;

2. The designed oil sludge treatment system is convenient for fully stirring the oil sludge water mixture through the helical blades, and realizes the layering of oil, sludge and water in the precipitation layering tank; the mud layer of sediment layering jar lower floor is convenient for strike off through stirring vane, has reduced the pile up of mud layer in sediment layering jar bottom, and then the sediment layering jar of mud layer discharge of being convenient for.

Drawings

FIG. 1 is a schematic diagram showing the overall structure of a sludge treatment system according to embodiment 1 of the present application;

FIG. 2 is a schematic structural view of a sedimentation delamination mechanism in the sludge treatment system of embodiment 1 of the present application;

fig. 3 is a cross-sectional view of fig. 2 in embodiment 1 of the present application.

Reference numerals illustrate: 1. a pretreatment device; 11. a temporary storage pool; 12. a vibration mechanism; 121. a vibrating screen tank; 122. a vibrating screen; 13. a dosing system; 14. a first pipeline; 15. a first lift pump; 16. a second pipeline; 161. a feed section; 162. a shunt section; 163. a discharging section; 17. a second lift pump; 18. a third pipeline; 19. a dosing pump; 2. a water washing device; 21. a water washing mechanism; 211. a water washing tank; 212. a stirring assembly; 2121. a stirrer; 22. a precipitation layering mechanism; 221. a precipitation layering tank; 222. an oil outlet groove; 223. a motor; 224. a rotating shaft; 225. a scraper; 226. an upper connecting rod; 227. a helical blade; 228. a lower connecting rod; 229. stirring blades; 23. a support frame; 24. a mud pipe; 25. an oil drain pipe; 26. a fourth pipeline; 3. an oil-water separation device; 31. a first homogenization tank; 32. a three-phase centrifuge; 33. a first collection box; 34. an oil storage tank; 35. a first connection pipe; 36. a first drain pipe; 4. a solid-liquid separation device; 41. a second homogenization tank; 42. a vertical centrifuge; 43. a second collection box; 44. a second connection pipe; 45. a second drain pipe; 5. a sewage pool.

Detailed Description

The application is described in further detail below with reference to fig. 1-3.

The embodiment of the application discloses an oil sludge treatment system.

Referring to fig. 1, an oil sludge treatment system comprises a pretreatment device 1, a water washing device 2, an oil-water separation device 3, a solid-liquid separation device 4 and a sewage tank 5 which are sequentially arranged; the oil sludge is subjected to primary screening, water washing, oil-water solid layering, oil-water separation, solid-liquid separation and centralized collection of sludge, water and oil, so that the oil content and water content of solid slag are reduced, and the sludge and oil are recovered and the sewage is collected in a centralized manner.

Referring to fig. 1, a pretreatment device 1 is used for preliminary screening of sludge, the pretreatment device 1 comprises a temporary storage tank 11, a first pipeline 14, a second pipeline 16, a vibration mechanism 12, a dosing system 13 and a third pipeline 18, and two stirrers 2121 are arranged in the temporary storage tank 11 and are used for stirring the sludge in the temporary storage tank 11; the vibrating mechanism 12 comprises a vibrating screen tank 121 and at least one vibrating screen 122, in this embodiment, two vibrating screens 122 are arranged, the two vibrating screens 122 are all arranged right above the vibrating screen tank 121 through bolts, and a discharge hole of the vibrating screen 122 is communicated with an inner cavity of the vibrating screen tank 121; the temporary storage tank 11 is communicated with the vibrating screen 122 through the first pipeline 14, the first pipeline 14 is connected with the temporary storage tank 11 and the feeding ports of the first pipeline 14 and the vibrating screen 122 through bolts, the temporary storage tank 11 is communicated with the vibrating screen 122, and the first pipeline 14 is provided with the first lifting pump 15 so that sludge in the temporary storage tank 11 is pumped and discharged into the vibrating screen 122.

Referring to fig. 1 and 2, a water washing device 2 comprises a water washing mechanism 21 and at least three groups of precipitation layering mechanisms 22 which are arranged in parallel, the water washing mechanism 21 comprises a water washing tank 211 and a stirring assembly 212 for stirring oil sludge and liquid medicine in an inner cavity of the water washing tank 211, a vibrating screen tank 121 is communicated with the precipitation layering tank 221 through a second pipeline 16, the second pipeline 16 comprises a feeding section 161, a discharging section 163 and a splitting section 162 which is positioned between the feeding section 161 and the discharging section 163, the number of the splitting sections 162 can be 1, 2 or 3, the communication between the feeding section 161 and the discharging section 163 is realized, so that the vibrating screen tank 121 is communicated with the water washing tank 211, one end of the splitting section 162 is welded with the feeding section 161, the other end of the splitting section 161 is welded with the discharging section 163, one end of the feeding section 161, which is far from the splitting section 162, is communicated with the vibrating screen tank 121 through a flange, and one end of the discharging section 163, which is far from the splitting section 162, is communicated with the water washing tank 211; the two diversion sections 162 are respectively provided with a second lifting pump 17 so as to facilitate the pumping and draining of the sludge in the vibrating screen tank 121 into the washing tank 211; in addition, the drug adding system 13 is communicated with the water washing tank 211 through a third pipeline 18, the third pipeline 18 is welded with the water washing tank 211 and the third pipeline 18 is welded with the drug adding system 13, and a drug adding pump 19 is arranged on the third pipeline 18 so as to facilitate the liquid medicine to be lifted into the water washing tank 211 through the drug adding pump 19; the stirring assembly 212 includes a stirrer 2121 for stirring the liquid medicine and the sludge mixed liquid, and the stirrer 2121 is installed on the washing tank 211 so as to sufficiently mix the liquid medicine and the sludge, so that crude oil in the sludge is sufficiently resolved.

Referring to fig. 2 and 3, the sedimentation layering mechanism 22 in the application can be 3 sets, 4 sets or 5 sets, and in the embodiment, the sedimentation layering tanks 221 are provided with 4 sets, and the 4 sets of sedimentation layering tanks 221 are used alternately, so that the continuous operation of the sludge treatment system is ensured; the sedimentation delamination mechanism 22 includes a sedimentation delamination tank 221, a rotation shaft 224, a scraper 225, an upper link 226, a lower link 228, and at least one helical blade 227; a fourth pipeline 26 is arranged at the feed inlet of the sedimentation layering tank 221, one end, far away from the sedimentation layering tank 221, of the fourth pipeline 26 is connected with the water washing tank 211, the communication between the inner cavity of the sedimentation layering tank 221 and the inner cavity of the water washing tank 211 is realized, and a third lifting pump is arranged on the fourth pipeline 26; The rotating shaft 224 is coaxially arranged with the sedimentation layering tank 221, the rotating shaft 224 is rotationally connected with the sedimentation layering tank 221, a motor 223 is arranged at one end of the rotating shaft 224 extending out of the sedimentation layering tank 221, the rotating shaft 224 is connected with the motor 223 through a coupling, the motor 223 adopts a variable frequency motor, a supporting frame 23 is arranged at one end of the rotating shaft 224 far away from the motor 223, the supporting frame 23 is positioned in the inner cavity of the sedimentation layering tank 221, the supporting frame 23 is welded with the inner wall of the sedimentation layering tank 221, and the supporting frame 23 is rotationally connected with the rotating shaft 224; an oil outlet groove 222 for discharging the oil-water mixture is formed in the sedimentation layering tank 221, the oil outlet groove 222 is welded with the sedimentation layering tank 221, an oil inlet of the oil outlet groove 222 is communicated with the inner cavity of the sedimentation layering tank 221, the oil outlet groove 222 is close to the top wall of the sedimentation layering tank 221, a scraper 225 is mounted on a rotating shaft 224, the scraper 225 is located in the inner cavity of the sedimentation layering tank 221, and the top wall of the scraper 225 is higher than the bottom wall of the oil outlet groove 222; Screw blades 227 are arranged below the scraping plate 225, in the embodiment, two screw blades 227 are arranged, the upper ends of the two screw blades 227 are welded with the upper connecting rod 226, the lower ends of the two screw blades 227 are welded with the lower connecting rod 228, the upper connecting rod 226 and the lower connecting rod 228 are axially arranged in parallel, and the upper connecting rod 226 is arranged along the radial direction of the rotating shaft 224; the stirring blade 229 is disposed between the lower link 228 and the support frame 23, and the stirring blade 229 is disposed near the support frame 23 so as to accelerate the discharge of the sludge deposited at the bottom of the precipitation tank 221; when the sludge is mixed, the rotating shaft 224 rotates at a high speed under the action of the variable frequency stirrer, so that the full stirring of the sludge is realized, the sludge is precipitated after the stirring of the sludge is finished, in the precipitating process, the oil, water and the sludge are gradually layered, the upper layer is an oil layer, the middle layer is an aqueous layer, the lower layer is a sludge layer, after the oil, water and the sludge are precipitated and layered, the motor 223 drives the rotation to rotate at a low speed, the rotating shaft 224 drives the scraping plate 225 to scrape the upper layer into the oil outlet tank 222 for collecting, the water in the middle layer is discharged through two water outlets in the middle layer and flows into the sewage tank 5 for recycling, the sludge in the lower layer is conveyed to the solid-liquid separation device 4 through the conveying pump, in the conveying process, the rotating shaft 224 drives the stirring blade 229 to rotate at a medium speed, the mud-water mixture in the precipitation layering tank 221 is stirred in a middle part, so that precipitation is prevented in the mud-water conveying process, and the mud-water mixture is discharged conveniently.

Referring to fig. 1, an oil drain pipe 25 and a sludge drain pipe 24 are installed on a precipitation layering tank 221, one end of the oil drain pipe 25 is communicated with the inner cavity of an oil outlet tank 222, the other end of the oil drain pipe is connected with an oil-water separation device 3, and oil-water separation of an oil sludge mixture is performed through the oil-water separation device 3; one end of the sludge discharging pipe 24 is communicated with the inner cavity of the precipitation layering tank 221, the sludge discharging pipe 24 is arranged close to the bottom wall of the precipitation layering tank 221, one end of the sludge discharging pipe 24, far away from the precipitation layering tank 221, is connected with the solid-liquid separation device 4, and mud-water separation of the oil sludge mixture is achieved through the solid-liquid separation device 4.

Referring to fig. 1, the oil-water separator 3 includes a first homogenizing tank 31, a first connecting pipe 35, a three-phase centrifuge 32, and an oil storage tank 34, wherein a feed inlet of the first homogenizing tank 31 is communicated with a liquid outlet of an oil outlet tank 222 through an oil outlet pipe 25, and two ends of the oil outlet pipe 25 are respectively connected with the first homogenizing tank 31 and the oil outlet tank 222 through flanges; the discharge gate of first homogeneity jar 31 and the feed liquor mouth of three-phase centrifuge 32 pass through first connecting pipe 35 intercommunication, install the fourth elevator pump on the first connecting pipe 35 to in transporting the oily water mixture in the homogeneity jar to three-phase centrifuge 32, three-phase centrifuge 32 adopts three-phase horizontal centrifuge in this embodiment, three-phase centrifuge 32's oil-out passes through oil drain pipe 25 and oil storage tank 34 intercommunication, the first collection box 33 that is used for solid sediment to collect in the three-phase centrifuge 32 is installed to three-phase centrifuge 32's discharge gate below, three-phase centrifuge 32's outlet communicates with effluent water sump 5 through first drain pipe 36, in order to collect in a concentrated way of sewage.

Referring to fig. 1, the solid-liquid separation device 4 includes a second homogenizing tank 41, a second connecting pipe 44, and a vertical centrifuge 42, one end of the sludge discharge pipe 24, which is far away from the precipitation layering tank 221, is communicated with a feed inlet of the second homogenizing tank 41, and both ends of the sludge discharge pipe 24 are respectively connected with the second homogenizing tank 41 and the precipitation layering tank 221 through flanges; one end of a second connecting pipe 44 is connected with a discharge port of the second homogenizing tank 41, the other end of the second connecting pipe is communicated with a feed port of the vertical centrifugal machine 42, a second material collecting box 43 for collecting solid slag in the vertical centrifugal machine 42 is arranged below the discharge port of the vertical centrifugal machine 42 so as to collect mud, and the discharge port of the vertical centrifugal machine 42 is communicated with the sewage tank 5 through a second drain pipe 45 so as to collect sewage in a concentrated manner; in this embodiment, a stirrer is installed in the second homogenizing tank 41 to avoid the muddy water from precipitating in the second homogenizing tank 41, so that the muddy water is conveniently conveyed into the vertical centrifuge 42 along the second connecting pipe 44; in addition, the first connecting pipe 35 and the second connecting pipe 44 are respectively provided with a pump body, so that the oil-water mixture and the mud-water mixture can be conveniently conveyed.

The implementation principle of the oil sludge treatment system of the embodiment of the application is as follows: in the sludge treatment process, the sludge stored in the temporary storage tank 11 is regulated to the first lift pump 15, so that the sludge mixed liquid in the temporary storage tank 11 enters the vibrating screen 122 to separate large particles and foreign matters in the sludge, the separated sludge flows into the vibrating screen tank 121, the second lift pump 17 is regulated to enable the sludge in the vibrating screen tank 121 to enter the water washing tank 211, meanwhile, the chemical liquid in the chemical adding system 13 is regulated to be added into the water washing tank 211 through the third pipeline 18, then the sludge and the chemical liquid in the water washing tank 211 are fully stirred through the stirrer 2121 so as to fully analyze crude oil in the sludge, the analyzed sludge enters the sedimentation layering tank 221 through the fourth pipeline 26, the motor 223 is regulated, the driving shaft of the motor 223 drives the rotating shaft 224 to rotate, the rotating shaft 224 drives the scraping plate 225, the spiral blade 227 and the stirring blade 229 to rotate, the rotating shaft 224 rotates at a high speed under the action of the variable frequency stirrer to fully stir the oil sludge, the oil sludge is precipitated after the stirring of the oil sludge is completed, in the precipitation process, oil, water and sludge are gradually layered, the upper layer is an oil layer, the middle layer is a water layer, the lower layer is a sludge layer, after the oil, water and sludge are precipitated and layered, the motor 223 drives the rotation to rotate at a low speed, the rotating shaft 224 drives the scraper 225 to scrape the upper layer into the oil outlet tank 222 to collect oil and water mixture in the oil outlet tank 222, the water and oil mixture flows into the first homogenizing tank 31 along the oil outlet pipe 25, then the oil and water mixture in the first homogenizing tank 31 flows into the three-phase centrifuge 32 by adjusting the pump body on the first connecting pipe 35, oil flows into the oil storage tank 34 under the action of the three-phase centrifuge 32, sewage flows into the sewage pool 5, and the sludge falls into the first material collecting tank 33; the water in the middle layer is discharged through two water outlets in the middle and flows into the sewage tank 5 for recycling; then the motor 223 is regulated, the motor 223 drives the rotating shaft 224 to rotate, the rotating shaft 224 drives the stirring blade 229 to rotate at medium speed, the mud-water mixture at the lower layer of the precipitation layering tank 221 is stirred in a middle way, so that the mud-water mixture at the lower layer is conveyed to the second homogenizing tank 41 through the pump body, after the homogenization of the mud-water mixture is finished, the pump body on the second connecting pipe 44 is regulated, so that the homogenized mud-water mixture is conveyed to the vertical centrifuge 42, mud in the vertical centrifuge 42 falls into the second material collecting tank 43 under the action of the vertical centrifuge 42, sewage flows into the sewage tank 5, and separation of oil, mud and water in the oil-mud mixture is realized.

The above embodiments are not intended to limit the scope of the present application, so: all equivalent changes in structure, shape and principle of the application should be covered in the scope of protection of the application.

Claims

1. The oil sludge treatment system is characterized by comprising a pretreatment device (1), a water washing device (2), an oil-water separation device (3) and a solid-liquid separation device (4) which are sequentially arranged;

The pretreatment device (1) is used for primary screening of the oil sludge; the pretreatment device (1) comprises a temporary storage tank (11), a first pipeline (14), a second pipeline (16) and a vibration mechanism (12), wherein the vibration mechanism (12) comprises a vibration sieve tank (121) and at least one vibration sieve (122), the vibration sieve (122) is arranged right above the vibration sieve tank (121), a discharge hole of the vibration sieve (122) is communicated with an inner cavity of the vibration sieve tank (121), the temporary storage tank (11) is communicated with the vibration sieve (122) through the first pipeline (14), a first lifting pump (15) is arranged on the first pipeline (14), the vibration sieve tank (121) is communicated with a sedimentation layering tank (221) through the second pipeline (16), and a second lifting pump (17) is arranged on the second pipeline (16).

The washing device (2) comprises a washing mechanism (21) and at least three groups of sedimentation layering mechanisms (22) which are arranged in parallel;

the washing mechanism (21) comprises a washing tank (211) and a stirring assembly (212) for stirring the oil sludge and the liquid medicine in the inner cavity of the washing tank (211), and the stirring assembly (212) is arranged on the washing tank (211);

The sedimentation layering mechanism (22) comprises a sedimentation layering tank (221), a rotating shaft (224), a scraping plate (225) and a motor (223);

A fourth pipeline (26) is arranged at the feed inlet of the precipitation layering tank (221), one end, far away from the precipitation layering tank (221), of the fourth pipeline (26) is communicated with the inner cavity of the water washing tank (211), and an oil outlet groove (222) for discharging an oil-water mixture is formed in the precipitation layering tank (221);

The rotating shaft (224) is coaxially arranged with the precipitation layering tank (221), the rotating shaft (224) is rotationally connected with the precipitation layering tank (221), the scraping plate (225) is installed on the rotating shaft (224), the scraping plate (225) is located in an inner cavity of the precipitation layering tank (221), the top wall of the scraping plate (225) is higher than the bottom wall of the oil outlet groove (222), the motor (223) is installed at one end, extending out of the precipitation layering tank (221), of the rotating shaft (224), and the motor (223) drives the rotating shaft (224) to rotate;

An oil discharge pipe (25) and a mud discharge pipe (24) are arranged on the precipitation layering tank (221), one end of the oil discharge pipe (25) is communicated with the inner cavity of the oil outlet groove (222), and the other end of the oil discharge pipe is connected with the oil-water separation device (3);

The oil-water separation device (3) is used for oil-water separation in an oil sludge mixture, the oil-water separation device (3) comprises a first homogenizing tank (31), a first connecting pipe (35), a three-phase centrifuge (32) and an oil storage tank (34), a feed inlet of the first homogenizing tank (31) is communicated with a liquid outlet of an oil outlet tank (222) through an oil discharge pipe (25), a discharge outlet of the first homogenizing tank (31) is communicated with a liquid inlet of the three-phase centrifuge (32) through the first connecting pipe (35), an oil outlet of the three-phase centrifuge (32) is communicated with the oil storage tank (34), and a first material collecting box (33) used for collecting solid slag in the three-phase centrifuge (32) is arranged below the discharge outlet of the three-phase centrifuge (32);

One end of the mud discharging pipe (24) is communicated with the inner cavity of the precipitation layering tank (221), the mud discharging pipe (24) is arranged close to the bottom wall of the precipitation layering tank (221), and one end of the mud discharging pipe (24) far away from the precipitation layering tank (221) is connected with the solid-liquid separation device (4);

the solid-liquid separation device (4) is used for solid-liquid separation in the fatlute mixture, the solid-liquid separation device (4) includes second homogeneity jar (41), second connecting pipe (44) and vertical centrifuge (42), sediment layering jar (221) one end is kept away from to sediment layering jar (24) with the feed inlet intercommunication of second homogeneity jar (41), second connecting pipe (44) one end with the bin outlet of second homogeneity jar (41) is connected, the other end with the feed inlet intercommunication of vertical centrifuge (42), the bin outlet below of vertical centrifuge (42) is provided with and is used for second collection box (43) that solid sediment was collected in vertical centrifuge (42).

2. The sludge treatment system of claim 1 wherein: the sedimentation layering mechanism (22) further comprises an upper connecting rod (226), a lower connecting rod (228) and at least one helical blade (227), wherein the upper connecting rod (226), the lower connecting rod (228) and the helical blade (227) are all located in an inner cavity of the sedimentation layering tank (221), the upper connecting rod (226) and the lower connecting rod (228) are all connected with the rotating shaft (224), the scraping plate (225) is located above the upper connecting rod (226), the upper connecting rod (226) and the lower connecting rod (228) are all arranged along the radial direction of the rotating shaft (224), one end of the helical blade (227) is connected with the upper connecting rod (226), and the other end of the helical blade (227) is connected with the lower connecting rod (228).

3. The sludge treatment system of claim 2 wherein: the inner cavity of the precipitation layering tank (221) is provided with a supporting frame (23), the supporting frame (23) is in rotary connection with the rotating shaft (224) away from the motor (223), and the spiral blade (227) is located above the supporting frame (23).

4. A sludge treatment system as claimed in claim 3 wherein: the rotating shaft (224) is provided with a stirring blade (229), and the stirring blade (229) is positioned between the spiral blade (227) and the supporting frame (23).

5. The sludge treatment system of claim 1 wherein: the pretreatment device (1) further comprises a dosing system (13) and a third pipeline (18), one end of the third pipeline (18) is connected with the discharge end of the dosing system (13), the other end of the third pipeline is communicated with the water washing tank (211), and a dosing pump (19) is arranged on the third pipeline (18).

6. The sludge treatment system as claimed in claim 1, wherein a first drain pipe (36) is installed at the drain port of the three-phase centrifuge (32), a second drain pipe (45) is installed at the drain port of the vertical centrifuge (42), and a sewage tank (5) for sewage collection is installed at the liquid outlet of the first drain pipe (36) and the liquid outlet of the second drain pipe (45) together.

7. The sludge treatment system of claim 1 wherein the agitation assembly (212) includes an agitator (2121) for agitating the liquid drug and sludge mixture.