CN114395414A - Rolling oil film method purification system and operation method - Google Patents
Rolling oil film method purification system and operation method Download PDFInfo
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- CN114395414A CN114395414A CN202111497845.2A CN202111497845A CN114395414A CN 114395414 A CN114395414 A CN 114395414A CN 202111497845 A CN202111497845 A CN 202111497845A CN 114395414 A CN114395414 A CN 114395414A
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10G—CRACKING HYDROCARBON OILS; PRODUCTION OF LIQUID HYDROCARBON MIXTURES, e.g. BY DESTRUCTIVE HYDROGENATION, OLIGOMERISATION, POLYMERISATION; RECOVERY OF HYDROCARBON OILS FROM OIL-SHALE, OIL-SAND, OR GASES; REFINING MIXTURES MAINLY CONSISTING OF HYDROCARBONS; REFORMING OF NAPHTHA; MINERAL WAXES
- C10G31/00—Refining of hydrocarbon oils, in the absence of hydrogen, by methods not otherwise provided for
- C10G31/11—Refining of hydrocarbon oils, in the absence of hydrogen, by methods not otherwise provided for by dialysis
Abstract
The invention relates to a rolling oil membrane method purification system and an operation method thereof, and the rolling oil membrane method purification system comprises a crude oil tank, an oil product purification system, a backwashing device and an oil purification tank, wherein the crude oil tank, the oil product purification system and the oil purification tank are sequentially connected so as to convey crude oil to the oil product purification system for filtration, oil liquid formed after filtration enters the oil purification tank for storage, and the backwashing device is respectively connected with the oil purification tank and the oil product purification system so as to convey the oil liquid in the oil purification tank to the oil product purification system for backwashing. The sump oil treatment designed by the invention is carried out by adopting a membrane filtration method, the refining cost is reduced, the refining process is simplified, and the process has the advantages of no phase change, low energy consumption and simple operation; and the phase change separation process is avoided, the dirty oil index is not changed, the oil outlet is stable, the light transmittance is more than 80%, and the stable operation of a rolling oil system is ensured.
Description
Technical Field
The invention relates to the technical field of dirty oil purification, in particular to a rolling oil film method purification system and an operation method.
Background
The rolling oil is required to be continuously sprayed in the production and processing processes of the aluminum plate and the aluminum foil, so that the effects of lubrication, cooling, cleaning, corrosion prevention and the like are achieved. In order to ensure that production is performed normally and stably, management of the use of rolling oil is very important. During the use of the rolling oil, a large amount of aluminum scraps and other impurities are mixed, so that the quality of the rolling oil is reduced, and the stability of production and the quality of products are influenced if the rolling oil is not purified and filtered. The control index of the rolling oil in the using process is mainly light transmittance, and the light transmittance at the wavelength of 800nm is generally required to be tested by a spectrophotometer to be more than 80%.
At present, the method of clay and diatomite adsorption and plate-and-frame filtration is generally adopted for purifying rolling oil in the aluminum processing industry, in order to ensure higher light transmittance of the rolling oil, the diatomite and the clay are required to be continuously added for adsorption, impurities are adsorbed into filter media such as the diatomite and the clay, the diatomite and the clay after saturated adsorption become solid hazardous waste, the treatment cost is high, in addition, 30-40% of oil by weight of the diatomite and the clay can be taken away, the oil loss is caused, the production cost is higher, in addition, the diatomite and the clay are added for manual addition, and the labor intensity is higher.
Disclosure of Invention
The object of the present invention is to solve at least one of the technical drawbacks mentioned.
Therefore, an object of the present invention is to provide a rolling oil film purification system and an operation method thereof, so as to solve the problems mentioned in the background art and overcome the disadvantages in the prior art.
In order to achieve the above object, an embodiment of one aspect of the present invention provides a rolling oil film method purification system, which includes a raw dirty oil tank, an oil purification system, a backwashing device, and an oil purification tank, wherein the raw dirty oil tank, the oil purification system, and the oil purification tank are sequentially connected to convey raw dirty oil into the oil purification system for filtration, oil formed after filtration enters the oil purification tank for storage, the backwashing device is respectively connected to the oil purification tank and the oil purification system to convey the oil in the oil purification system for backwashing, the oil purification system includes a primary oil purification film filtration device and a secondary oil purification film filtration device, an oil inlet of the primary oil purification film filtration device is connected to the raw dirty oil tank to filter the raw dirty oil, an outlet of a backwashing liquid of the primary oil purification film filtration device is communicated with an oil inlet of the secondary oil purification film filtration device, the oil production ports of the primary oil product purification membrane filtering device and the secondary oil product purification membrane filtering device are communicated with the oil purifying tank.
It is preferred by any of the above-mentioned schemes, one-level oil purification membrane filter equipment and second grade oil purification membrane filter equipment's structure is the same, one-level oil purification membrane filter equipment includes sump oil transport assembly, oil purification membrane filter, oil return subassembly, washing concentrate collection subassembly, oil purification membrane filter's oil inlet is connected with sump oil transport assembly and washing concentrate collection subassembly respectively, oil purification membrane filter's oil return opening is connected the oil return subassembly, oil purification membrane filter's the oil mouth of producing communicates with the oil inlet of purifying box.
Preferably, in any of the above schemes, the oil purification membrane filter is formed by connecting a plurality of groups of hollow fiber external pressure column type oil purification membrane components in parallel.
Preferably by any one of the above schemes, the dirty oil conveying assembly comprises a dirty oil conveying pipeline, one end of the dirty oil conveying pipeline is connected with an oil inlet of the oil purification membrane filter, and a manual valve in front of the lift pump, a dirty oil lift pump, a security filter and an automatic oil supply valve are sequentially installed on the dirty oil conveying pipeline according to the original dirty oil conveying direction.
Preferably, the cleaning concentrate collecting assembly comprises a cleaning concentrate tank and a cleaning concentrate pipeline, one end of the cleaning concentrate pipeline is connected with an oil inlet of the oil purification membrane filter, the other end of the cleaning concentrate pipeline is communicated with an oil inlet of the cleaning concentrate tank, and a cleaning and collecting automatic valve and a cleaning and collecting pump are sequentially installed on the cleaning concentrate pipeline according to the flow direction of the cleaning concentrate.
Preferably, in any one of the above schemes, the other end of the dirty oil conveying pipeline in the primary oil purification membrane filtering device is connected with the oil outlet of the original dirty oil tank, the other end of the dirty oil conveying pipeline in the secondary oil purification membrane filtering device is connected with the oil outlet of the cleaning concentrate tank in the primary oil purification membrane filtering device, the oil outlet of the cleaning concentrate tank in the secondary oil purification membrane filtering device is connected with the solid-liquid separator, and the liquid outlet of the solid-liquid separator is communicated with the oil inlet of the original dirty oil tank.
Preferably by any one of the above schemes, the oil return assembly comprises an oil return pipeline, wherein a backflow electromagnetic flowmeter, a backflow pressure gauge and a backflow automatic valve are sequentially installed on the oil return pipeline according to an oil return direction, and one end of the oil return pipeline is connected with an oil return port of the oil purification membrane filter.
Preferably, in any one of the above schemes, the oil return pipeline in the first-stage oil product purification membrane filtering device is installed between the oil inlet of the original dirty oil tank and the oil return port of the oil product purification membrane filter, and the oil return pipeline in the second-stage oil product purification membrane filtering device is installed between the oil inlet of the cleaning concentrated solution and the oil return port of the oil product purification membrane filter.
Preferably, the backwashing device comprises a backwashing pipeline and backwashing branch pipes, one end of the backwashing pipeline is connected with an oil outlet of the clean oil tank, the other end of the backwashing pipeline is connected with the two backwashing branch pipes, a backwashing pump and a backwashing flow meter are sequentially installed on the backwashing pipeline according to the flowing direction of backwashing liquid, one of the backwashing branch pipes is communicated with an oil production port of the oil purification membrane filter in the first-stage oil purification membrane filtering device, the other backwashing branch pipe is communicated with an oil production port of the oil purification membrane filter in the second-stage oil purification membrane filtering device, and a backwashing automatic valve is installed on the backwashing branch pipe.
An embodiment of another aspect of the invention provides an operation method of a rolling oil film method purification system, which comprises the following steps of, wherein the rolling oil film method purification system is any one of the rolling oil film method purification systems;
step one, adopting a primary oil product purification membrane filtering device to produce oil, injecting original dirty oil in an original dirty oil tank into an oil product purification membrane filter from bottom to top through a dirty oil lifting pump, enabling redundant original dirty oil filled in the oil product purification membrane filter to flow back into the original dirty oil tank through an oil return pipeline, enabling the original dirty oil in the oil product purification membrane filter to enter the interior of membrane wires from the outer surfaces of the membrane wires under the action of pressure difference, and gathering the original dirty oil and conveying the oil into a clean oil tank through an oil production port;
step two, emptying the oil purification membrane filter in the primary oil purification membrane filtering device, closing the backflow automatic valve, the oil supply automatic valve and the sump oil lifting pump, opening the cleaning and collecting automatic valve, starting the cleaning and collecting pump, discharging oil on the outer surface of membrane wires in the oil purification membrane filter from an oil inlet, and entering a cleaning and concentrating solution tank through a cleaning and concentrating solution pipeline;
step three, after emptying, cleaning an oil purification membrane filter in the primary oil purification membrane filtering device, opening a backwashing automatic valve and a backwashing pump, enabling oil in a clean oil tank to enter an oil production port through a backwashing pipeline and a backwashing branch pipe, conveying the oil into the oil purification membrane filter from top to bottom, and enabling the oil to enter the outside of membrane filaments from the inside of the membrane filaments and be discharged into a cleaning concentrated solution tank through a cleaning collection pump;
step four, after backwashing is finished, sewage is discharged, a backwashing pump and a backwashing automatic valve are closed, a cleaning and collecting pump continues to convey oil in the oil purification membrane filter into a cleaning and concentrating tank until the oil in the oil purification membrane filter is emptied, a process period is finished, and the steps one to four are repeated, so that the cyclic treatment process of the primary oil purification membrane filtering device is finished;
step five, the dirty oil in the cleaning concentrate tank in the primary oil product purification membrane filtering device enters a secondary oil product purification membrane filtering device for purification treatment, and the steps one to four are repeated to complete the dirty oil treatment process in the cleaning concentrate tank in the primary oil product purification membrane filtering device;
and step six, enabling the sump oil in the cleaning concentrated solution tank in the secondary oil product purification membrane filtering device to enter a solid-liquid separator from the oil outlet for solid-liquid separation, transporting the generated solid away by a mobile vehicle, and enabling the supernatant to flow back into the original sump oil tank.
Compared with the prior art, the invention has the advantages and beneficial effects that:
1. the dirty oil treatment is carried out by adopting a membrane filtration method, the refining cost is reduced, the refining process is simplified, and the process has the advantages of no phase change, low energy consumption and simple operation; the phase change separation process is avoided, the dirty oil index is not changed, the oil outlet is stable, the light transmittance is more than 80%, and the stable operation of a rolling oil system is guaranteed;
2. the oil purification membrane is physically cleaned by adopting three combined processes of emptying, backwashing and pollution discharge, wherein the emptying stage is the emptying process in the inner cavity of the membrane component, so that the resistance in the oil backwashing process is reduced; in the oil backwashing stage, the filtering liquid oil is reversely pressurized and permeates the cross section of the hollow fiber membrane, and the pollutants attached to the surface of the membrane filaments are quickly separated from the membrane filaments by oil reverse washing, so that the flux is quickly recovered; in the sewage discharge stage, the separated pollutants are emptied and discharged, so that the pollutant content on the surface of the membrane wire is prevented from being attached again, and the cleaning effect is improved;
3. by adopting two-stage membrane filtration and centrifugal solid-liquid separation, the oil recovery rate reaches more than 99.99 percent, the oil loss is less, the hazardous waste water yield is reduced by half, and the problems of rolling oil loss and production cost increase caused by large hazardous waste amount generated by adopting diatomite and clay filtration are avoided.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
fig. 1 is a schematic diagram of the overall structure of a rolling oil film method purification system according to an embodiment of the present invention.
Wherein: 1. a sewage oil feeding hole; 2. a raw sewage tank; 3. a liquid level meter; 4. a manual valve for discharging the crude dirty oil tank; 5. A manual valve in front of the lift pump; 6. a sump oil lift pump; 7. a rear manual valve for the lift pump; 8. an oil return line; 9. a cartridge filter; 10. an automatic valve for oil supply; 11. an oil purifying membrane filter; 12. a reflux electromagnetic flowmeter; 13. a reflux pressure gauge; 14. a reflux manual valve; 15. a reflux automatic valve; 16. an electromagnetic flow meter for producing oil; 17. cleaning and collecting the automatic valve; 18. cleaning the collection pump; 19. cleaning and collecting the manual valve; 20. cleaning a concentrated solution pipeline; 21. cleaning the concentrated solution tank; 22. The concentrated solution cleaning tank is emptied by a manual valve; 23. an oil production pressure gauge; 24. an automatic valve for oil production; 25. backwashing the automatic valve; 26. backwashing the manual valve; 27. a manual valve in front of the backwashing pump; 28. a backwash pump; 29. a manual valve of a backwashing pump; 30. Backwashing the flow meter; 31. a clean oil tank emptying valve; 32. a clean oil tank; 33. backwashing the pipeline; 34. backwashing the branch pipes; 35. an oil production pipeline; 36. dirty oil conveying pipeline.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.
As shown in fig. 1, an embodiment of the present invention provides a rolling oil film method purification system, which includes a raw oil tank 2, an oil purification system, a backwashing device, and an oil purification tank 32, wherein the raw oil tank 2, the oil purification system, and the oil purification tank 32 are sequentially connected to convey raw dirty oil into the oil purification system for filtration, oil formed after filtration enters the oil purification tank 32 for storage, the backwashing device is respectively connected to the oil purification tank 32 and the oil purification system to convey the oil in the oil purification tank 32 into the oil purification system for backwashing, the oil purification system includes a primary oil purification film filtration device and a secondary oil purification film filtration device, an oil inlet of the primary oil purification film filtration device is connected to the raw dirty oil tank 2 to filter the raw dirty oil, an outlet of a backwashing liquid of the primary oil purification film filtration device is communicated with an oil inlet of the secondary oil purification film filtration device, the oil production ports of the first-stage oil product purification membrane filtering device and the second-stage oil product purification membrane filtering device are communicated with the clean oil tank 32. And a sump oil supplementing feed inlet 1 is formed in the top end of the original sump oil tank 2 and used for supplementing sump oil into the original sump oil tank 2.
The structure of one-level oil purification membrane filter equipment and second grade oil purification membrane filter equipment is the same, one-level oil purification membrane filter equipment includes sump oil transport assembly, oil purification membrane filter 11, oil return subassembly, washing concentrate collection subassembly, oil purification membrane filter 11's oil inlet is connected with sump oil transport assembly and washing concentrate collection subassembly respectively, oil return subassembly is connected to oil purification membrane filter 11's oil return opening, oil purification membrane filter 11's the oil mouth of producing communicates with the oil inlet of purifying box.
The oil product purification membrane filter 11 is formed by connecting a plurality of groups of hollow fiber external pressure column type oil product purification membrane components in parallel, the operating transmembrane pressure difference is less than or equal to 0.15MPa, and the oil inlet pressure is less than or equal to 0.25 MPa. The filtering aperture of the oil product purifying membrane filter 11 is 0.01-0.2 μm, the membrane module outline dimension phi is 160x1500, the single membrane area is 50m2, and the oil production stage time in each process cycle is 50-180 min.
Further, an oil production port of the oil purification membrane filter 11 is communicated with an oil inlet of the clean oil tank 32 through an oil production pipeline 35, and the oil production electromagnetic flowmeter 16, the oil production pressure gauge 23 and the oil production automatic valve 24 are sequentially installed on the oil production pipeline 35 according to an oil production flow direction.
The dirty oil conveying assembly comprises a dirty oil conveying pipeline 36, one end of the dirty oil conveying pipeline 36 is connected with an oil inlet of the oil purifying membrane filter 11, and a front manual valve 5 of the lifting pump, a dirty oil lifting pump 6, a rear manual valve 7 of the lifting pump, a security filter 9 and an automatic oil supply valve 10 are sequentially arranged on the dirty oil conveying pipeline 36 according to the original dirty oil conveying direction. An oil supply pressure gauge is arranged on the security filter 9, and the precision of the security filter 9 is 50-100 mu m.
The cleaning concentrated solution collecting assembly comprises a cleaning concentrated solution tank 21 and a cleaning concentrated solution pipeline 20, one end of the cleaning concentrated solution pipeline 20 is connected with an oil inlet of the oil product purification membrane filter 11, the other end of the cleaning concentrated solution pipeline is communicated with the oil inlet of the cleaning concentrated solution tank 21, and the cleaning concentrated solution pipeline 20 is sequentially provided with a cleaning and collecting automatic valve 17, a cleaning and collecting pump 18 and a cleaning and collecting manual valve 19 according to the flow direction of the cleaning concentrated solution.
Further, install the particle count appearance on washing concentrate pipeline 20, the particle count appearance is connected with the PLC controller, and the solid particle number content of the discharge liquid after the on-line monitoring washs at every turn characterizes membrane cleaning performance. The particle number content of the initial discharged liquid is higher after each membrane backwashing, and the particle number content in the discharged tail-stage waste liquid is reduced. If the particle number content of the discharged liquid is higher all the time, the particle counter can send a signal, the PLC controller controls the discharged liquid to carry out a cleaning process again until the particle number content of the discharged liquid reaches the standard, the characterization membrane is qualified in cleaning, and the next oil production period is started.
The other end of a dirty oil conveying pipeline 36 in the primary oil purification membrane filtering device is connected with an oil outlet of the original dirty oil tank 2, the other end of the dirty oil conveying pipeline 36 in the secondary oil purification membrane filtering device is connected with an oil outlet of a cleaning concentrated solution tank 21 in the primary oil purification membrane filtering device, an oil outlet of the cleaning concentrated solution tank 21 in the secondary oil purification membrane filtering device is connected with a solid-liquid separator, and a liquid outlet of the solid-liquid separator is communicated with an oil inlet of the original dirty oil tank 2. Solid matters such as aluminum scraps in the aluminum foil rolling oil are suspended in the oil and are not easy to precipitate, the solid-liquid separation efficiency is accelerated by adopting a solid-liquid separator, and the solid-liquid separation quality is improved.
The oil return assembly comprises an oil return pipeline 8, a return electromagnetic flowmeter 12, a return pressure gauge 13, a return manual valve 14 and a return automatic valve 15 are sequentially installed on the oil return pipeline 8 according to the oil return direction, and one end of the oil return pipeline 8 is connected with an oil return port of the oil product purification membrane filter 11.
An oil return pipeline 8 in the first-stage oil purification membrane filtering device is arranged between an oil inlet of the original sewage oil tank 2 and an oil return port of the oil purification membrane filter 11, and an oil return pipeline 8 in the second-stage oil purification membrane filtering device is arranged between an oil inlet of the cleaning concentrated solution and the oil return port of the oil purification membrane filter 11.
The backwashing device comprises a backwashing pipeline 33 and backwashing branch pipes 34, one end of the backwashing pipeline 33 is connected with an oil outlet of a clean oil tank 32, the other end of the backwashing pipeline 33 is connected with two backwashing branch pipes 34, a manual valve 27 in front of a backwashing pump 28, a manual valve of the backwashing pump 28 and a backwashing flow meter 30 are sequentially installed on the backwashing pipeline 33 according to the flowing direction of backwashing liquid, one backwashing branch pipe 34 is communicated with an oil production port of the oil purification membrane filter 11 in the first-stage oil purification membrane filter device, the other backwashing branch pipe 34 is communicated with an oil production port of the oil purification membrane filter 11 in the second-stage oil purification membrane filter device, and the backwashing branch pipe 34 is provided with a backwashing automatic valve 25 and a backwashing manual valve 26. Wherein, the backwashing branched pipe 34 is communicated with the corresponding oil production pipeline 35.
In order to facilitate cleaning of the liquid oil tank, a raw dirty oil tank 2 discharge manual valve is installed at the lower end of the raw dirty oil tank 2, a clean oil tank 32 emptying valve 31 is installed at the lower end of the clean oil tank 32, and cleaning concentrate tanks 21 emptying manual valves are respectively installed at the lower ends of the cleaning concentrate tanks 21.
Further, in order to facilitate liquid level control, liquid level meters 3 are respectively installed in the raw oil tank 2, the clean oil tank 32 and the cleaning concentrated solution tank 21.
Before the system is started, all manual valves except a manual valve for discharging the original sewage oil tank 2, an emptying valve for cleaning a concentrated solution tank 21 and an emptying manual valve for a clean oil tank 32 are required to be opened; before starting the system, dirty oil needs to be added into the crude oil tank 2 to meet the liquid level required by the system starting, the system is stopped when the liquid level reaches the set high liquid level of the crude oil tank 2, and the system is started when the liquid level is lower than the set low liquid level of the crude oil tank 2;
step one, a primary oil product purification membrane filtering device is adopted for oil production, raw dirty oil in a raw dirty oil tank 2 is injected into an oil product purification membrane filter 11 from bottom to top through a dirty oil lifting pump 6, redundant raw dirty oil filled in the oil product purification membrane filter 11 flows back to the raw dirty oil tank 2 through an oil return pipeline 8, the raw dirty oil in the oil product purification membrane filter 11 enters the interior of a membrane wire from the outer surface of the membrane wire under the action of pressure difference and is collected and conveyed into an oil purification tank 32 through an oil production port, and oil production is achieved; the oil production stage time is 60-180min, cross flow filtration is adopted, the flux is 20-50L/square meter.h, and the oil temperature is 30-40 ℃;
step two, emptying dirty oil in an oil purification membrane filter 11 in the primary oil purification membrane filtering device, closing a backflow automatic valve 15, an oil supply automatic valve 10 and a dirty oil lifting pump 6, opening a cleaning and collecting automatic valve 17, starting a cleaning and collecting pump 18, discharging oil on the outer surface of membrane wires in the oil purification membrane filter 11 from an oil inlet, and entering a cleaning concentrated solution tank 21 through a cleaning concentrated solution pipeline 20; the emptying time is 20-30s, and the emptying amount is 1.5-2.5 m3/h according to the oil amount of a single component;
step three, after emptying, cleaning the oil purification membrane filter 11 in the primary oil purification membrane filtering device, opening a backwashing automatic valve 25 and a backwashing pump 28, feeding oil in a clean oil tank 32 into an oil production port through a backwashing pipeline 33 and a backwashing branch pipe 34, conveying the oil into the oil purification membrane filter 11 from top to bottom, and feeding the oil into the outside of membrane filaments from the inside of the membrane filaments and discharging the oil into a cleaning concentrated solution tank 21 through a cleaning collection pump 18; the backwashing time is 20-30s, and the backwashing amount is 1.0-1.5 m3/h according to the oil amount of a single component;
step four, after backwashing is finished, sewage is discharged, the backwashing pump 28 and the backwashing automatic valve 25 are closed, the cleaning and collecting pump 18 continues to convey oil in the oil purification membrane filter 11 into the cleaning and concentrating tank until the oil in the oil purification membrane filter 11 is emptied, a process period is finished, the steps one to four are repeated, and the cyclic treatment process of the primary oil purification membrane filtering device is finished; after backwashing is finished, the sewage discharge time is 10-20 s; the sewage discharge amount is 1.5-2.5 m3/h according to the oil amount of a single component;
step five, the dirty oil in the cleaning concentrate tank 21 in the primary oil purification membrane filtering device enters a secondary oil purification membrane filtering device for purification treatment, and the steps one to four are repeated to complete the dirty oil treatment process in the cleaning concentrate tank 21 in the primary oil purification membrane filtering device so as to realize oil production;
and step six, enabling the sump oil in the cleaning concentrated solution tank 21 in the secondary oil product purification membrane filtering device to enter a solid-liquid separator from an oil outlet for solid-liquid separation, transporting the generated solid away by a mobile vehicle, and enabling the supernatant to flow back to the original sump oil tank 2.
Step two to step four are to the cleaning stage of the oil purification membrane filtration device, the cleaning stage includes evacuation, backwash, blowdown, step two is the evacuation stage, step three to step four are backwash and blowdown stage, the evacuation stage is the evacuation process in the membrane module lumen, reduce the oil and backwash the process resistance; in the oil backwashing stage, the filtering liquid oil is reversely pressurized and permeates the cross section of the hollow fiber membrane, and the pollutants attached to the surface of the membrane filaments are quickly separated from the membrane filaments by oil reverse washing, so that the flux is quickly recovered; and in the sewage discharge stage, the separated pollutants are emptied and discharged, so that the pollutant content on the surface of the membrane wire is prevented from being attached again, and the cleaning effect is improved.
The two-stage oil product purification membrane filtering device is adopted for filtering, the net oil filtration yield of the first-stage oil product purification membrane filtering device is more than 95%, the concentrated solution filtered in the previous stage is subjected to second-stage membrane filtration through the second-stage oil product purification membrane filtering device, the second-stage membrane filtration yield reaches more than 90%, and the comprehensive membrane filtration yield can reach more than 99.5%. Each process cycle sequentially comprises an oil production stage and a cleaning stage, wherein the cleaning stage comprises two to four steps; high-intensity cleaning is carried out after a plurality of process cycles, and the cleaning effect is good.
The rolling oil membrane method purification system can also be used for purifying rolling oil in a steel mill, dehydrating light oil, removing impurities and the like.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
It will be understood by those skilled in the art that the present invention includes any combination of the summary and detailed description of the invention described above and those illustrated in the accompanying drawings, which is not intended to be limited to the details and which, for the sake of brevity of this description, does not describe every aspect which may be formed by such combination. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made in the above embodiments by those of ordinary skill in the art without departing from the principle and spirit of the present invention. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (10)
1. The rolling oil film method purification system is characterized by comprising a raw dirty oil tank, an oil purification system, a backwashing device and an oil purification tank, wherein the raw dirty oil tank, the oil purification system and the oil purification tank are sequentially connected to convey raw dirty oil into the oil purification system for filtration, oil formed after filtration enters the oil purification tank for storage, the backwashing device is respectively connected with the oil purification tank and the oil purification system to convey the oil in the oil purification system for backwashing, the oil purification system comprises a primary oil purification film filtration device and a secondary oil purification film filtration device, an oil inlet of the primary oil purification film filtration device is connected with the raw dirty oil tank to filter the raw dirty oil, an backwashing liquid outlet of the primary oil purification film filtration device is communicated with an oil inlet of the secondary oil purification film filtration device, and oil production ports of the primary oil purification film filtration device and the secondary oil purification film filtration device are communicated with the oil purification tank And (4) communicating.
2. The rolling oil film method purification system of claim 1, wherein the primary oil purification film filtering device and the secondary oil purification film filtering device have the same structure, the primary oil purification film filtering device comprises a dirty oil conveying component, an oil purification film filter, an oil return component and a cleaning concentrated solution collecting component, an oil inlet of the oil purification film filter is connected with the dirty oil conveying component and the cleaning concentrated solution collecting component respectively, an oil return port of the oil purification film filter is connected with the oil return component, and an oil production port of the oil purification film filter is communicated with an oil inlet of a purification box.
3. The rolling oil film method purification system of claim 2, wherein the oil purification film filter is formed by connecting a plurality of groups of hollow fiber external pressure column oil purification film components in parallel.
4. The rolling oil membrane method purification system according to claim 2, wherein the dirty oil conveying assembly comprises a dirty oil conveying pipeline, one end of the dirty oil conveying pipeline is connected with an oil inlet of the oil purification membrane filter, and a manual valve before the lift pump, a dirty oil lift pump, a security filter and an automatic oil supply valve are sequentially arranged on the dirty oil conveying pipeline according to the original dirty oil conveying direction.
5. The rolling oil film method purification system of claim 2, wherein the cleaning concentrate collecting assembly comprises a cleaning concentrate tank and a cleaning concentrate pipeline, one end of the cleaning concentrate pipeline is connected with an oil inlet of the oil purification film filter, the other end of the cleaning concentrate pipeline is communicated with an oil inlet of the cleaning concentrate tank, and a cleaning and collecting automatic valve and a cleaning and collecting pump are sequentially arranged on the cleaning concentrate pipeline according to the flow direction of the cleaning concentrate.
6. The rolling oil film method purification system according to claim 4, wherein the other end of the dirty oil conveying pipeline in the primary oil purification film filtering device is connected with an oil outlet of a raw dirty oil tank, the other end of the dirty oil conveying pipeline in the secondary oil purification film filtering device is connected with an oil outlet of a cleaning concentrate tank in the primary oil purification film filtering device, an oil outlet of the cleaning concentrate tank in the secondary oil purification film filtering device is connected with a solid-liquid separator, and a liquid outlet of the solid-liquid separator is communicated with an oil inlet of the raw dirty oil tank.
7. The rolling oil film method purification system according to claim 1, wherein the oil return assembly comprises an oil return pipeline, a return electromagnetic flowmeter, a return pressure gauge and a return automatic valve are sequentially installed on the oil return pipeline according to an oil return direction, and one end of the oil return pipeline is connected with an oil return port of the oil product purification film filter.
8. The rolling oil film method purification system according to claim 7, wherein the oil return pipeline in the primary oil purification film filter device is installed between the oil inlet of the original dirty oil tank and the oil return port of the oil purification film filter, and the oil return pipeline in the secondary oil purification film filter device is installed between the oil inlet of the cleaning concentrate and the oil return port of the oil purification film filter.
9. The rolling oil membrane method purification system as claimed in claim 1, wherein the backwashing device comprises a backwashing pipeline and backwashing branch pipes, one end of the backwashing pipeline is connected with an oil outlet of a clean oil tank, the other end of the backwashing pipeline is connected with two backwashing branch pipes, a backwashing pump and a backwashing flow meter are sequentially installed on the backwashing pipeline according to the flowing direction of backwashing liquid, one backwashing branch pipe is communicated with an oil production port of the oil purification membrane filter in the first-stage oil purification membrane filtration device, the other backwashing branch pipe is communicated with an oil production port of the oil purification membrane filter in the second-stage oil purification membrane filtration device, and a backwashing automatic valve is installed on the backwashing branch pipe.
10. A rolling oil film method purification system operation method is characterized in that: the method comprises the following steps, wherein the rolling oil film method purification system is the rolling oil film method purification system of any one of claims 1 to 9;
step one, adopting a primary oil product purification membrane filtering device to produce oil, injecting original dirty oil in an original dirty oil tank into an oil product purification membrane filter from bottom to top through a dirty oil lifting pump, enabling redundant original dirty oil filled in the oil product purification membrane filter to flow back into the original dirty oil tank through an oil return pipeline, enabling the original dirty oil in the oil product purification membrane filter to enter the interior of membrane wires from the outer surfaces of the membrane wires under the action of pressure difference, and gathering the original dirty oil and conveying the oil into a clean oil tank through an oil production port;
step two, emptying the oil purification membrane filter in the primary oil purification membrane filtering device, closing the backflow automatic valve, the oil supply automatic valve and the sump oil lifting pump, opening the cleaning and collecting automatic valve, starting the cleaning and collecting pump, discharging oil on the outer surface of membrane wires in the oil purification membrane filter from an oil inlet, and entering a cleaning and concentrating solution tank through a cleaning and concentrating solution pipeline;
step three, after emptying, cleaning an oil purification membrane filter in the primary oil purification membrane filtering device, opening a backwashing automatic valve and a backwashing pump, enabling oil in a clean oil tank to enter an oil production port through a backwashing pipeline and a backwashing branch pipe, conveying the oil into the oil purification membrane filter from top to bottom, and enabling the oil to enter the outside of membrane filaments from the inside of the membrane filaments and be discharged into a cleaning concentrated solution tank through a cleaning collection pump;
step four, after backwashing is finished, sewage is discharged, a backwashing pump and a backwashing automatic valve are closed, a cleaning and collecting pump continues to convey oil in the oil purification membrane filter into a cleaning and concentrating tank until the oil in the oil purification membrane filter is emptied, a process period is finished, and the steps one to four are repeated, so that the cyclic treatment process of the primary oil purification membrane filtering device is finished;
step five, the dirty oil in the cleaning concentrate tank in the primary oil product purification membrane filtering device enters a secondary oil product purification membrane filtering device for purification treatment, and the steps one to four are repeated to complete the dirty oil treatment process in the cleaning concentrate tank in the primary oil product purification membrane filtering device;
and step six, enabling the sump oil in the cleaning concentrated solution tank in the secondary oil product purification membrane filtering device to enter a solid-liquid separator from the oil outlet for solid-liquid separation, transporting the generated solid away by a mobile vehicle, and enabling the supernatant to flow back into the original sump oil tank.
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