CN113337309B

CN113337309B - Waste mineral oil purification device and purification method thereof

Info

Publication number: CN113337309B
Application number: CN202110628533.4A
Authority: CN
Inventors: 任杰; 蔡永生; 王海鹏; 周长坤; 王海波; 任勇; 曲克宇; 徐鑫鑫; 李博; 孙壮; 王庚; 王瑞
Original assignee: Panjin Ningtai Energy Technology Co ltd
Current assignee: Yingkou Ningtai Environmental Protection Technology Co ltd
Priority date: 2021-06-07
Filing date: 2021-06-07
Publication date: 2022-09-16
Anticipated expiration: 2041-06-07
Also published as: CN113337309A

Abstract

The invention discloses a waste mineral oil purification device and a purification method thereof, which are characterized in that: the system comprises an instant heating unit, a conditioning unit, a separation unit and a security unit, wherein a complete waste mineral oil purification device is formed by adopting a two-layer process frame platform, and automatic control is realized by an intelligent control system consisting of a PLC (programmable logic controller) or DCS (distributed control system), a display control instrument and a valve; a process for purifying waste mineral oil is also disclosed. The waste mineral oil purification device can realize the purification treatment capacity of waste mineral oil of 3-20 t/h, is suitable for the purification treatment of various waste mineral oils, and has the water content of the treated waste mineral oil less than 0.3 percent (wt%) and the impurity content less than 0.3 percent (wt%); and the series membrane filter unit obtains the regenerated base oil, thereby realizing the regeneration of the waste mineral oil. Compared with the prior art, the invention solves the problems of long time consumption, complex process, complex operation, low treatment efficiency, poor treatment effect, unstable process, poor oil product adaptability and the like of the existing waste mineral oil purification device, and the economic benefit is obviously improved.

Description

Waste mineral oil purification device and purification method thereof

Technical Field

The invention relates to the technical field of comprehensive utilization of waste mineral oil resources, in particular to a waste mineral oil purifying device and a purifying method thereof.

Background

Waste mineral oil is listed in national records of hazardous waste, and is numbered HW08, and the main components of the waste mineral oil are hydrocarbon substances with relatively small carbon atoms, most of the waste mineral oil are unsaturated hydrocarbons, and the waste mineral oil has stable performance. The waste mineral oil is mainly derived from petroleum exploitation, natural gas exploitation, refined petroleum product manufacturing and other related industries, and comprises various waste lubricating oil, waste internal combustion engine oil, waste gear oil, waste hydraulic oil and the like.

The waste mineral oil is a complex mixture composed of a plurality of substances, the main components of the waste mineral oil comprise a plurality of toxic substances such as C15-C36 alkane, Polycyclic Aromatic Hydrocarbons (PAHs), olefin, benzene series, phenols, heavy metal ions and the like, the components in the waste mineral oil have certain toxicity and harm to human bodies, and once a large amount of the waste mineral oil enters an external environment, serious environmental pollution can be caused. The waste mineral oil has higher resource utilization value, and can be effectively and comprehensively utilized, thereby not only effectively promoting the treatment of waste pollutants in China, but also ensuring the sustainable development of the resource comprehensive utilization industry.

The waste resource recycling industry is used as an important component of the circular economy and a strategic emerging industry in China, has various effects of economy, society and environment, and is an effective way for relieving resource pressure, reducing environmental pollution and promoting green development. In order to further promote the comprehensive utilization of resources and environmental protection, the national attention on the comprehensive utilization of the waste mineral oil is higher and higher, the recycling of the waste mineral oil is listed in key products and service guide catalogues of the strategic emerging industries of China, and a series of policies, laws, regulations and specifications are provided to guide the development of the waste mineral oil recycling industry.

The nation puts forward a clear requirement on a recycling process route of waste mineral oil, and according to the relevant content of the waste mineral oil comprehensive utilization industry standard condition (No. 79 of the Ministry of industry and informatization of the people's republic of China, 2015): "New construction, reconstruction and extension of waste mineral oil comprehensive utilization enterprises should adopt energy-saving, environment-friendly technology, safe and mature advanced process and equipment which meet national requirements. The distillation process for refining the regenerated lubricant base oil recommends high vacuum distillation including molecular distillation, thin film evaporation, reduced pressure distillation and the like. The post-refining process of regenerating lube base oils encourages the use of solvent refining or hydrofinishing. The waste mineral oil recycling process comprises a pretreatment process, a distillation process and a refining regeneration process.

The waste mineral oil contains a large amount of metal powder, dust, moisture, oil sludge, gravel, additives, colloid asphaltene, mechanical impurities and other substances, and metal scraps, cotton felt scraps, fibers and other impurities can be mixed in the collecting, storing and transporting processes, so that the waste mineral oil raw material cannot directly enter a waste mineral oil regeneration process device for processing, and the feeding condition of the process device can be met only by purifying the waste mineral oil.

The purification treatment of the waste mineral oil is a crucial link for the recycling of waste mineral oil resources, and can avoid the problems of pipeline blockage of process equipment, coking and scaling of heat exchangers and heating furnace equipment, catalyst inactivation, low linear oil quality, unstable operation of the process equipment and the like caused by non-ideal components such as impurities in the waste mineral oil in the regeneration process of the waste mineral oil.

The method has the advantages of low temperature rise, inaccurate temperature control, long purification time consumption of waste mineral oil pretreatment, low treatment efficiency, poor treatment effect, unstable process, poor oil product adaptability and the like, so that the regenerated base oil of the waste mineral oil has low purity and low regeneration yield, is difficult to be secondarily utilized or sold, and meanwhile, the process device has serious coking, short operation period, short service life of a catalyst, unstable operation of the process device, poor economic benefit and is not beneficial to industrialized integrated production.

Disclosure of Invention

The invention aims to provide a waste mineral oil purification device and a purification method thereof, which are used for solving at least one technical problem of the existing waste mineral oil purification device, such as slow temperature rise, inaccurate temperature control, long treatment time consumption, complex process, complex operation and control, low treatment efficiency, poor treatment effect, unstable process, poor oil product adaptability and the like.

In order to solve the problems, the invention discloses a waste mineral oil purification device and a purification method thereof.

Preferably, the instant heating unit and the conditioning unit are arranged on a lower platform, the separation unit and the security unit are arranged on an upper platform, and the lower platform and the upper platform are combined to form a two-layer process frame platform;

the waste mineral oil purification device is automatically controlled by an intelligent control system consisting of a PLC or DCS, a display control instrument, a valve and a process pipeline.

Preferably, the instant heating unit comprises a self-cleaning filter, a raw material pump, a first flowmeter and a rapid heat exchanger group which are sequentially connected through a process pipeline according to the flow direction of the waste mineral oil, the rapid heat exchanger group is connected with the conditioning unit through the process pipeline, and the self-cleaning filter is communicated with the self-temperature-control dirty oil recovery device through a sewage discharge process pipeline; the raw material pump and the flowmeter are connected with the flow control valve I respectively, a temperature display control instrument I is installed on an outlet pipeline of the rapid heat exchanger group, the rapid heat exchanger group is connected with the heat medium flow control valve I through the temperature display control instrument I, and the rapid heat exchanger group is one or more spiral plate type heat exchangers.

Preferably, the quenching and tempering unit can adopt one or more parallelly connected modes to connect, the quenching and tempering unit includes static mixer, quenching and tempering jar and the circulating pump that connects gradually through the process line according to the waste mineral oil flow direction, be equipped with a plurality of medicament inlets on the static mixer, the static mixer is connected with the automatic feeder apparatus of medicament through a plurality of medicament inlets, the circulating pump pass through the process line with the static mixer is connected.

Preferably, the tempering tank comprises an elliptical head, a cylinder, a conical head and supporting legs which are sequentially connected from top to bottom, the lower end of the conical head is provided with a manhole, a drain outlet, an oil outlet and a circulation port, the circulation port is connected with the circulating pump through a process pipeline, the oil outlet is connected with the separation unit through a process pipeline, and the oil outlet is connected with the separation unit through a process pipeline; a temperature maintaining heater I and a coalescing filler are arranged in the tempering tank, a cyclone is arranged in the tempering tank, an inlet of the cyclone is connected with an inlet pipe, a lower outlet of the cyclone is positioned above a sewage discharge outlet, an upper outlet of the cyclone is upward, and the inlet pipe is connected with the static mixer; the upper end of quenching and tempering jar sets up back-fire relief breather valve one, urgent bleeder valve, light trap, oil metering hole, oil water interface control instrument, platform and cat ladder, the side of quenching and tempering jar is equipped with the supplementary breakdown of emulsion of standing wave ultrasonic wave that temperature display control instrument two, PH value display control instrument, liquid level control instrument one and a plurality of equipartitions set up and subsides the device, temperature display control instrument two-way heating medium flow control valve two with keep warm heater one is connected.

Preferably, the separation unit comprises a horizontal screw feeding pump, a horizontal screw flowmeter, a three-way valve, a horizontal screw centrifuge, a crude oil tank, a disc feeding pump, a disc flowmeter, a fiber filter, a disc separator, a back pressure valve and an oil purification tank which are sequentially connected through a process pipeline according to the flow direction of the waste mineral oil, wherein the horizontal screw feeding pump is connected with the conditioning unit through the process pipeline, the horizontal screw feeding pump is connected with a second flow regulating valve, and the second flow regulating valve is connected with the horizontal screw flowmeter; the horizontal decanter centrifuge is respectively connected with a crude oil tank and a slurry tank, a third temperature display control instrument, a second fire-retardant breather valve, a second liquid level control instrument and a stirrer are arranged outside the crude oil tank, a second temperature maintaining heater is arranged inside the crude oil tank, and a third temperature display control instrument, a third heating medium flow regulating valve and the second temperature maintaining heater are connected; the disc feeding pump is connected with a flow regulating valve III, and the flow regulating valve III is connected with the disc flowmeter; the disc separator is respectively connected with the oil purification tank, the slurry tank and the sewage tank, a fire-retardant breather valve III, a liquid level control instrument III and a temperature display control instrument IV are arranged outside the oil purification tank, a temperature maintaining heater III is arranged inside the oil purification tank, a four-way overheat media flow regulating valve IV of the temperature display control instrument is connected with the temperature maintaining heater III, and the oil purification tank is connected with a security unit through a process pipeline.

Preferably, the security unit comprises a feeding pump, a flow meter II, two back-flushing precision filters, a coalescence separator, a temporary storage tank, an output pump, a flow meter III and a membrane filter unit which are sequentially connected through a process pipeline according to the flow direction of the waste mineral oil; the feeding pump is connected with the separation unit through a process pipeline, the feeding pump is connected with a flow regulating valve V, and the flow regulating valve V is connected with the flow meter II; the two back-washing precision filters are arranged in parallel and are respectively connected with an adjustable differential pressure instrument; a water collecting part of the coalescence separator is provided with a first liquid level display control instrument and a heater; a fire-retardant breather valve IV, a liquid level display control instrument II and a temperature display control instrument V are arranged outside the temporary storage tank, a temperature maintaining heater IV is arranged inside the temporary storage tank, and the temperature display control instrument V is connected with the temperature maintaining heater IV through a heat medium flow regulating valve V; the output pump is connected with the flow regulating valve IV, the flow regulating valve IV is connected with the flowmeter III, the output pump is connected with the membrane filter unit, and the membrane filter unit is connected with the automatic temperature control dirty oil recovery device.

Preferably, a purification method of a waste mineral oil purification apparatus includes the steps of:

step 1, heating: removing mechanical impurities with the particle size larger than 1mm from the waste mineral oil through an instant heating unit, heating to 70-90 ℃, entering a tempering tank, and keeping the oil temperature in the tempering tank at 70-90 ℃;

step 2, tempering: adding a PH regulator into the tempering tank by using an automatic reagent adding device, uniformly mixing by using a circulating pump through a static mixer, separating solid impurities by using a cyclone, adjusting the PH value of waste mineral oil in the tempering tank to 7-9, adding fresh water into the tempering tank by using the automatic reagent adding device, wherein the addition amount of the fresh water is 5-8% of the oil amount in the tempering tank, uniformly mixing by using the circulating pump through the static mixer, and separating the solid impurities by using the cyclone;

step 3, demulsification: adding a demulsifier into a conditioning tank through an automatic agent adding device, uniformly mixing the demulsifier by a circulating pump through a static mixer, separating solid impurities through a cyclone, starting a standing wave ultrasonic-assisted demulsification and sedimentation device with the addition of 100-10000 mg/L demulsifier, wherein the oil temperature is 70-90 ℃, the ultrasonic sound intensity is 0.25-0.65W/cm 2, the working frequency is 18-50 KHz, the pulse width is 5-10 ms, and the irradiation time is less than 30 min;

step 4, settling: keeping the oil temperature in the tempering tank at 70-90 ℃, standing for 2-8 h, and discharging water and impurities settled on the lower layer of the tempering tank;

and 5, desalting: adding fresh water into a conditioning tank through an automatic agent adding device, wherein the adding amount of the fresh water is 5-8% of the oil amount in the conditioning tank, uniformly mixing the fresh water and the oil in a static mixer through a circulating pump, separating solid impurities through a cyclone, starting a standing wave ultrasonic-assisted demulsification and sedimentation device, wherein the oil temperature is 70-90 ℃, the ultrasonic sound intensity is 0.25-0.65W/cm 2, the working frequency is 18-50 KHz, the pulse width is 5-10 ms, and the irradiation time is less than 30 min;

step 6, separation: performing liquid-solid separation by using a horizontal screw centrifuge to remove impurities in the waste mineral oil, wherein the working speed of the horizontal screw centrifuge is 3200-4000 rpm, the separation factor is more than 2800, the differential rotation number is 2-8 rpm, the retention time is 5-15 min, the separated liquid phase flows into a crude oil tank, the solid phase and the cleaning residual liquid flow into a slurry tank, a stirrer uniformly mixes the waste mineral oil in the crude oil tank, then the mixture enters a disc separator to perform oil-water-solid three-phase separation, a back pressure valve is adjusted to control the water content of an outlet oil phase, the separated oil phase enters a clean oil tank, a solid phase and deslagging flushing liquid enter the slurry tank, and a water phase flows into a sewage tank;

and 7, purifying: removing water and impurities generated by material fluctuation of the separation unit by using a back flush precision filter and a coalescence separator, ensuring the treatment effect of waste mineral oil purification, wherein the water content of the treated waste mineral oil purified oil is less than 0.3 percent (wt percent), and the solid phase impurity content is less than 0.3 percent (wt percent);

step 8, regeneration: and further removing pollutants, residual additives and colloid asphaltenes in the waste mineral oil by using a membrane filter unit to obtain the high-quality regenerated mineral oil base oil.

Drawings

FIG. 1 is a schematic structural view of the present invention;

FIG. 2 is a schematic diagram of an instant thermal unit of the present invention;

FIG. 3 is a schematic structural diagram of a conditioning unit of the present invention;

FIG. 4 is a schematic view of the structure of the separation unit of the present invention;

fig. 5 is a schematic diagram of the security unit structure of the present invention;

FIG. 6 is a schematic view of a quenching and tempering tank of the invention;

FIG. 7 is a process flow diagram of the present invention;

FIG. 8 is a schematic view of the cleaning device of the present invention;

FIG. 9 is a schematic view of the construction of the push plate of the present invention;

FIG. 10 is a schematic structural view of a self-temperature-control dirty oil recovery device according to the present invention;

FIG. 11 is a schematic view of the housing structure of the present invention;

FIG. 12 is a view of the slide belt A of FIG. 6;

fig. 13 is a view of the separation chamber B in fig. 6.

In the figure: 1. an instantaneous heat unit; 101. a self-cleaning filter; 102. a feedstock pump; 103. a first flowmeter; 104. a rapid heat exchanger group; 105. a first flow regulating valve; 106. a self-temperature-control dirty oil recovery device; 107. a first temperature display control instrument; 108. a first heating medium flow regulating valve; 2. a tempering unit; 201. a static mixer; 202. a tempering tank; 2001. an elliptical end enclosure; 2002. a barrel; 2003. a conical end enclosure; 2004. a support leg; 2005. a temperature maintenance heater I; 2006. a coalescing filler; 2007. a second temperature display control instrument; 2008. a PH value display control instrument; 2009. a first liquid level control instrument; 2010. a fire retardant breather valve I; 2011. an emergency relief valve; 2012. a light-transmitting hole; 2013. an oil metering hole; 2014. an oil-water interface control instrument; 2015. a platform; 2016. climbing a ladder; 2017. a standing wave ultrasonic wave auxiliary demulsification sedimentation device; 2018. a second heating medium flow regulating valve; 2019. a manhole; 2020. a sewage draining outlet; 2021. an oil outlet; 2022. a circulation port; 2023. a swirler; 2024. an inlet pipe; 203. a circulation pump; 204. a medicament automatic feeding device; 3. a separation unit; 301. a horizontal screw feed pump; 302. a horizontal screw flowmeter; 303. a three-way valve; 304. a horizontal screw centrifuge; 305. a crude oil tank; 306. a feed pump; 307. a disc flowmeter; 308. a fiber filter; 309. a disc separator; 310. a back pressure valve; 311. a clean oil tank; 312. a slurry tank; 313. a third temperature display control instrument; 314. a fire retardant breather valve II; 315. a liquid level control instrument II; 316. a stirrer; 317. a temperature maintenance heater II; 318. a heating medium flow regulating valve III; 319. a flow regulating valve II; 320. a flow regulating valve III; 321. a sewage tank; 322. a fire retardant breather valve III; 323. a liquid level control instrument III; 324. a fourth temperature display control instrument; 325. a temperature maintenance heater III; 326. a fourth heating medium flow regulating valve; 4. a security unit; 401. a feed pump; 402. a second flowmeter; 403. backwashing the precision filter; 404. a coalescing separator; 405. a temporary storage tank; 406. an output pump; 407. a flow regulating valve V; 408. a membrane filtration unit; 409. an adjustable differential pressure gauge; 410. a first liquid level display control instrument; 411. a heater; 412. fire retardant breather valve IV; 413. a liquid level display control instrument II; 414. a fifth temperature display control instrument; 415. maintaining the temperature of the heater four; 416. a fifth heating medium flow regulating valve; 417. a flow regulating valve IV; 418. a third flowmeter; 5. a housing; 501. a first cavity; 502. a second cavity; 503. a motor chamber; 504. a third cavity; 505. a fourth cavity; 6. a second bevel gear; 7. a first bevel gear; 8. a first pulley; 9. a double-headed motor; 10. rotating the shaft four; 11. a third bevel gear; 12. a third rotating shaft; 13. a fourth bevel gear; 14. a feed inlet; 15. a centrifugal cylinder; 1501. a filtration pore; 16. a mixing bin; 17. a discharge pipe; 18. a discharge pipe; 19. separating the bins; 20. a water separator; 21. settling the inclined end; 22. a connecting shaft; 23. a third pulley; 24. a sliding belt; 25. fixing a sleeve; 26. a lifting sleeve; 27. rotating the rod; 28. a first fixing plate; 29. a second gear; 30. a first gear; 31. sucking blocks; 32. a magnet; 33. a second rotating shaft; 34. connecting blocks; 35. a supporting seat; 36. placing the tank; 37. a sliding groove; 38. a first sliding block; 39. a sliding seat; 40. a first rotating shaft; 41. a second pulley; 42. a fixed shaft; 43. a fixed block; 44. mounting a plate; 45. a first spring; 46. a fixed seat; 47. a first motor; 48. a rotating plate; 49. mounting the cylinder; 4901. mounting a plate; 50. sealing sleeves; 51. a second motor; 52. a threaded rod; 53. a cutter bar; 5301. mounting blocks; 54. a storage tank body; 55. a power shell; 5501. an annular groove; 56. a second fixing plate; 57. a hydraulic cylinder; 58. a second sliding block; 59. a support block; 60. a push rod; 61. a push block; 62. pushing the plate; 63. cleaning the tube; 64. a blocking plate; 65. positioning blocks; 66. a cavity; 67. a second spring; 68. a base.

Detailed Description

The preferred embodiments of the present invention will be described in conjunction with the accompanying drawings, and it will be understood that they are described herein for the purpose of illustration and explanation and not limitation.

In addition, the descriptions related to the first, the second, etc. in the present invention are only used for description purposes, do not particularly refer to an order or sequence, and do not limit the present invention, but only distinguish components or operations described in the same technical terms, and are not understood to indicate or imply relative importance or implicitly indicate the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In addition, technical solutions and technical features between various embodiments can be combined with each other, but must be realized by a person skilled in the art, and when the technical solutions are contradictory or cannot be realized, the combination of the technical solutions should be considered to be absent and not be within the protection scope of the present invention.

The invention provides the following examples

Example 1

The embodiment of the invention provides a waste mineral oil purification device and a purification method thereof, as shown in figures 1-6, the purification device is characterized in that: the system comprises four unit modules, namely an instant heating unit 1, a conditioning unit 2, a separation unit 3 and a security unit 4, wherein the instant heating unit 1, the conditioning unit 2, the separation unit 3 and the security unit 4 are sequentially communicated;

the instant heating unit 1 and the tempering unit 2 are arranged on a lower-layer platform, the separation unit 3 and the security unit 4 are arranged on an upper-layer platform, and the lower-layer platform and the upper-layer platform are combined to form a two-layer process frame platform;

The beneficial effects of the above technical scheme are:

1. the instant heating unit 1 is adopted to quickly finish heating and warming of the waste mineral oil, and heating and warming are finished while feeding, so that the problems of slow warming, long warming time and inaccurate temperature control of the conventional waste mineral oil purification device are solved;

2. the process comprises the steps of adopting a conditioning unit 2, completing the processes of conditioning, standing wave ultrasonic wave and demulsifier combined demulsification, ultrasonic wave combined coalescer rapid sedimentation, automatic sewage discharge, water injection desalination, self-circulation uniform mixing, cyclone separation of solid-phase impurities and temperature maintenance heating in a conditioning tank, and adopting an intelligent control system consisting of a PLC (programmable logic controller) or a DCS (distributed control System), a display control instrument, a valve and a process pipeline to realize automatic control, thereby solving the problems of long time consumption, complex process, complex operation, low treatment efficiency, poor treatment effect, unstable process, poor oil product adaptability and the like of the existing waste mineral oil purification device;

3. by adopting the separation unit 3, the liquid-solid separation is realized by a horizontal screw centrifuge firstly, and the oil-water-solid three-phase separation is realized by a disc separator, so that the impurity removal and dehydration treatment effect is stable and reliable, the method is suitable for the dehydration and impurity removal operation of various oils, and the problems of the oil product adaptability and the treatment effect stability in the waste mineral oil purification process are solved;

4. by adopting the security unit 4, the backwashing precision filter and the coalescence separator are used for removing water and impurities which are not removed due to the fluctuation of materials of the separation unit, thereby ensuring the treatment effect of pretreatment and purification of the waste mineral oil, greatly improving the regeneration yield of the regenerated base oil, greatly slowing down the coking of a process device, greatly prolonging the service life of the catalyst and obviously improving the economic benefit; according to different purification requirements of the waste mineral oil, a membrane filter unit is connected in series behind the output pump, so that pollutants, residual additives, colloid asphaltenes and the like in the waste mineral oil can be further removed, high-quality regenerated mineral oil is obtained, and the regeneration of the waste mineral oil is realized.

5. The complete professional waste mineral oil purification device is formed by adopting two layers of process frame platforms, the structure is compact, the occupied area is small, the process arrangement is realized by fully utilizing the space, and the automatic control can be realized by utilizing an intelligent control system consisting of a PLC (programmable logic controller) or a DCS (distributed control system), a display control instrument and a valve. Compared with the existing waste mineral oil purification device, the device has the advantages of high specialized integration, simple operation and control, high treatment efficiency, good treatment effect, stable and reliable impurity removal and dehydration, reasonable structure, small occupied area, full utilization of space, strong oil product adaptability and the like, and overcomes the defects and shortcomings of the existing waste mineral oil purification device.

Example 2

On the basis of embodiment 1, as shown in fig. 1-2, the instant heating unit 1 comprises a self-cleaning filter 101, a raw material pump 102, a flow meter 103 and a rapid heat exchanger 104 which are sequentially connected through a process pipeline according to the flow direction of waste mineral oil, wherein the rapid heat exchanger 104 is connected with the conditioning unit 2, and the self-cleaning filter 101 is communicated with a self-temperature-control dirty oil recovery device 106 through a sewage disposal process pipeline; the raw material pump 102 and the flowmeter 103 are respectively connected with the flow control valve 105, a temperature display control instrument 107 is installed on an outlet pipeline of the rapid heat exchanger group 104, the rapid heat exchanger group 104 is connected with the heating medium flow control valve 108 through the temperature display control instrument 107, and the rapid heat exchanger group 104 is one or more spiral plate type heat exchangers.

The beneficial effects of the above technical scheme are:

the flow of a raw material pump 102 is automatically controlled by a flow meter I103 and a flow control valve I105, a self-cleaning filter 101 coarsely filters waste mineral oil and automatically cleans a filter element of the waste mineral oil, the cleaned slag-containing dirty oil flows into a self-temperature-control dirty oil recovery device 106 through a sewage discharge process pipeline, the temperature of an outlet oil of the waste mineral oil is automatically controlled by a temperature display control instrument I107 and a heat medium flow control valve I108, the waste mineral oil is heated by a rapid heat exchanger group 104 and then enters a quality adjusting unit 2, an instant heating unit 1 is adopted to rapidly complete heating and warming of the waste mineral oil, heating and warming are completed while feeding, and the problems of slow warming, long warming time and inaccurate temperature control of the conventional waste mineral oil purification device are solved.

Example 3

On the basis of embodiment 1, as shown in fig. 1, 3, and 6, the tempering unit 2 may be connected in parallel, the tempering unit 2 includes a static mixer 201, a tempering tank 202, and a circulation pump 203, which are sequentially connected through a process pipe in a flow direction of waste mineral oil, the static mixer 201 is provided with a plurality of agent inlets, the static mixer 201 is connected with an automatic agent adding device 204 through the plurality of agent inlets, and the circulation pump 203 is connected with the static mixer 201 through a process pipe;

the conditioning tank 202 comprises an elliptical head 2001, a cylinder 2002, a conical head 2003 and legs 2004 which are sequentially connected from top to bottom, the lower end of the conical head 2003 is provided with a manhole 2019, a drain 2020, an oil outlet 2021 and a circulation port 2022, the circulation port 2022 is connected with the circulation pump 203 through a process pipeline, and the oil outlet 2021 is connected with the separation unit 3 through a process pipeline; a temperature maintaining heater I2005 and a coalescing filler 2006 are arranged in the tempering tank 202, a cyclone 2023 is arranged in the tempering tank 202, the cyclone 2023 is connected with an inlet pipe 2024, the lower outlet of the cyclone 2023 is positioned above a sewage discharge port 2020, the upper outlet of the cyclone 2023 is upward, and the inlet pipe 2024 is connected with the static mixer 201; the upper end of the tempering tank 202 is provided with a fire-retardant breather valve 2010, an emergency relief valve 2011, a light hole 2012, an oil metering hole 2013, an oil-water interface control instrument 2014, a platform 2015 and a ladder 2016, the side end of the tempering tank 202 is provided with a temperature display control instrument II 2007, a pH value display control instrument 2008, a liquid level control instrument I2009 and a plurality of standing wave ultrasonic auxiliary demulsification and sedimentation devices 2017 which are uniformly distributed, and the temperature display control instrument II 2007 is connected with the temperature maintaining heater I2005 through a heat medium flow regulating valve II 2018.

The beneficial effects of the above technical scheme are:

a PH regulator, a demulsifier, a flocculant, fresh water and the like are added into the static mixer 201 through an automatic reagent adding device 204, and a circulating pump 203 is connected with the static mixer 201 through a process pipeline to form a self-circulating uniform mixing system; the oil temperature in the tempering tank 202 is heated by a temperature maintaining heater I2005, the automatic control of the oil temperature in the tempering tank 202 is realized through a temperature display control instrument II 2007 and a heating medium flow regulating valve II 2018, and the automatic control of the liquid level in the tempering tank 202 is realized through an oil-water interface control instrument 2014; the process comprises the steps of tempering, demulsification combining standing wave ultrasonic waves and demulsifiers, rapid sedimentation combining ultrasonic coalescers, automatic sewage discharge, water injection desalination, self-circulation uniform mixing, solid-phase impurity cyclone separation and temperature maintenance heating in a tempering tank 202, and the process is automatically controlled by an intelligent control system consisting of a PLC (programmable logic controller) or a DCS (distributed control system), a display control instrument, a valve and a process pipeline, so that the problems of long time consumption in treatment, complex process, complex operation, low treatment efficiency, poor treatment effect, unstable process, poor oil product adaptability and the like of the conventional waste mineral oil purification device are solved.

Example 4

On the basis of the embodiment 1, as shown in fig. 1 and 4, the separation unit 3 includes a horizontal screw feed pump 301, a horizontal screw flow meter 302, a three-way valve 303, a horizontal screw centrifuge 304, a crude oil tank 305, a disc feed pump 306, a disc flow meter 307, a fiber filter 308, a disc separator 309, a back pressure valve 310 and a clean oil tank 311 which are connected in sequence through a process pipeline according to the flow direction of the waste mineral oil, the horizontal screw feed pump 301 is connected with the conditioning unit 200 through the process pipeline, the horizontal screw feed pump 301 is connected with a second flow regulating valve 319, and the second flow regulating valve 319 is connected with the horizontal screw flow meter 302; the horizontal screw centrifuge 304 is respectively connected with a crude oil tank 305 and a slurry tank 312, a temperature display control instrument III 313, a fire retardant breather valve II 314, a liquid level control instrument II 315 and a stirrer 316 are arranged outside the crude oil tank 305, a temperature maintaining heater II 317 is arranged inside the crude oil tank 305, and the temperature display control instrument III 313 is connected with the temperature maintaining heater II 317 through a heat medium flow regulating valve III 318; the disc feed pump 306 is connected with a flow regulating valve III 320, and the flow regulating valve III 320 is connected with the disc flowmeter 307; the disc separator 309 is connected with the oil purification tank 311, the slurry tank 312 and the sewage tank 321 respectively, the outside of the oil purification tank 311 is provided with a fire-retardant breather valve III 322, a liquid level control instrument III 323 and a temperature display control instrument IV 324, the inside of the oil purification tank 311 is provided with a temperature maintaining heater II 325, the temperature display control instrument IV 324 is connected with the temperature maintaining heater II 325 through a heat medium flow regulating valve IV 326, and the oil purification tank 311 is connected with the security unit 4 through a process pipeline.

The technical scheme has the beneficial effects that;

the separated liquid phase of the horizontal decanter centrifuge 304 flows into a crude oil tank 305, and the solid phase and the cleaning residue flow into a slurry tank 312; a third temperature display control instrument 313 is arranged on the crude oil tank 305, a first temperature maintaining heater 317 is arranged in the crude oil tank 305, and the automatic control of the oil temperature in the crude oil tank 305 is realized through the third temperature display control instrument 313 and a third heat medium flow regulating valve 318; the horizontal screw feeding pump 301 is connected with the tempering unit 2 through a process pipeline, and the feeding flow of the horizontal screw feeding pump 301 is automatically controlled through the horizontal screw flowmeter 302 and the flow regulating valve II 319; the automatic control of the feeding flow of the disc separator 309 is realized by the disc flowmeter 307 and the flow regulating valve III 320, the water content of the oil phase at the outlet is controlled by the back pressure valve 310, the oil phase separated by the disc separator 309 flows into the oil purification tank 311, the solid phase and the cleaning residual liquid flow into the slurry tank 312, and the water phase flows into the sewage tank 321; a temperature maintaining heater II 322 is arranged in the oil purification tank 311, and the automatic control of the oil temperature in the oil purification tank 311 is realized through a temperature display control instrument IV 324 and a heat medium flow regulating valve IV 326; the automatic control of the oil level in the crude oil tank 305 is realized through the second liquid level control instrument 315, the horizontal screw centrifuge 304 is firstly used for realizing liquid-solid separation, and the disc separator 309 is then used for realizing oil-water-solid three-phase separation, so that the impurity removal and dehydration treatment effect is stable and reliable, the method is suitable for the dehydration and impurity removal operation of various oils, and the problems of oil product adaptability and treatment effect stability in the waste mineral oil purification process are solved.

Example 5

On the basis of the embodiment 2, as shown in fig. 1 and fig. 5, the security unit 4 comprises a feeding pump 401, a second flow meter 402, two backwashing precision filters 403, a coalescing separator 404, a temporary storage tank 405, an output pump 406, a third flow meter 418 and a membrane filter unit 408 which are sequentially connected through a process pipeline according to the flow direction of the waste mineral oil; the feed pump 401 is connected with the separation unit 3 through a process pipeline, the feed pump 401 is connected with a flow regulating valve five 407, and the flow regulating valve five 407 is connected with the flow meter two 402; the two backwashing precision filters 403 are arranged in parallel, and the two backwashing precision filters 403 are respectively connected with an adjustable differential pressure meter 409; a first liquid level display control instrument 410 and a heater 411 are arranged at the water collecting part of the coalescence separator 404; a fire-retardant breather valve IV 412, a liquid level display control instrument II 413 and a temperature display control instrument V414 are arranged outside the temporary storage tank 405, a temperature maintaining heater IV 415 is arranged inside the temporary storage tank 405, and the temperature display control instrument V414 is connected with the temperature maintaining heater IV 415 through a heat medium flow regulating valve V416; the output pump 406 is connected with a flow control valve four 417, the flow control valve four 417 is connected with the flow meter three 418, the output pump 406 is connected with a membrane filter unit 408, and the membrane filter unit 408 is connected with the self-temperature-control dirty oil recovery device 106.

The beneficial effects of the above technical scheme are:

automatic control of the oil level in the clean oil tank 311 is achieved by the feed pump 401 and the level control gauge three 324. The flow of the feed pump 401 is automatically controlled by a flow meter II 402 and a flow regulating valve V407; the two backwashing precision filters 403 are connected in parallel to be used and prepared, and the mutual switching is controlled by using a differential pressure signal of the adjustable differential pressure instrument 409 to complete backwashing and sewage discharge; a first liquid level display control instrument 410 and a heater 411 are arranged at the water collecting part of the coalescence separator 404, and the first liquid level display control instrument 410 is used for controlling the water level height of the water collecting part of the coalescence separator 404 so as to realize automatic drainage; a liquid level display control instrument II 413 and a temperature display control instrument V414 are arranged on the temporary storage tank 405, a temperature maintaining heater IV 415 is arranged in the temporary storage tank 405, the automatic control of the oil temperature in the temporary storage tank 405 is realized through the temperature display control instrument V414 and a heating medium flow regulating valve V416, and the automatic control of the oil level in the temporary storage tank 405 is realized through the liquid level display control instrument II 413; the waste mineral oil purified oil is obtained by the output of the output pump 406; according to different purification requirements of the waste mineral oil, a membrane filter unit 408 is connected in series behind the output pump 406; the backwashing precision filter 403 and the coalescence separator 404 are used for removing water and impurities which are not removed due to the fluctuation of materials of the separation unit, so that the treatment effect of pretreatment and purification of the waste mineral oil is ensured, the regeneration yield of the regenerated base oil can be greatly improved, the coking of a process device is greatly slowed down, the service life of the catalyst is greatly prolonged, the economic benefit is obviously improved, according to different purification requirements of the waste mineral oil, a membrane filter unit 408 is connected in series behind an output pump, pollutants, residual additives, colloid asphaltene and the like in the waste mineral oil can be further removed, the high-quality regenerated mineral oil is obtained, and the regeneration of the waste mineral oil is realized.

Example 6

Based on any one of examples 1 to 5, as shown in FIGS. 1 to 5 and 7, a purification method of a waste mineral oil purification apparatus comprises the steps of:

step 1, heating: removing mechanical impurities with the particle size larger than 1mm from the waste mineral oil through the instant heating unit 1, heating to 70-90 ℃, feeding into the tempering tank 202, and keeping the oil temperature in the tempering tank 202 at 70-90 ℃;

step 2, tempering: adding a PH regulator into the conditioning tank 202 by using an automatic reagent adding device 204, uniformly mixing by using a circulating pump 203 through a static mixer 201, separating solid impurities by using a swirler 2023, adjusting the PH value of waste mineral oil in the conditioning tank 202 to be 7-9, adding fresh water into the conditioning tank 202 by using the automatic reagent adding device 204, wherein the addition amount of the fresh water is 5-8% of the oil amount in the conditioning tank 202, uniformly mixing by using the circulating pump 203 through the static mixer 201, and separating the solid impurities by using the swirler 2023;

step 3, demulsification: adding a demulsifier into a conditioning tank 202 through an automatic agent adding device 204, simultaneously uniformly mixing by a circulating pump 203 through a static mixer 201, separating solid impurities through a cyclone 2023, wherein the adding amount of the demulsifier is 100-10000 mg/L, starting a standing wave ultrasonic auxiliary demulsification and sedimentation device, the oil temperature is 70-90 ℃, the ultrasonic sound intensity is 0.25-0.65W/cm 2, the working frequency is 18 KHz-50 KHz, the pulse width is 5-1 Oms, and the irradiation time is less than 30 min;

step 4, settling: keeping the temperature of the oil in the tempering tank 202 at 70-90 ℃, standing for 2-8 hours, and discharging water and impurities settled on the lower layer of the tempering tank 202;

and 5, desalting: fresh water is added into a conditioning tank 202 through an automatic reagent adding device 204, the adding amount of the fresh water is 5% -8% of the oil amount in the tank, meanwhile, a circulating pump 203 is used for uniformly mixing through a static mixer 201, solid impurities are separated through a cyclone 2023, a standing wave ultrasonic auxiliary demulsification and sedimentation device is started, the oil temperature is 70-90 ℃, the ultrasonic sound intensity is 0.25-0.65W/cm 2, the working frequency is 18 KHz-50 KHz, the pulse width is 5-10 ms, and the irradiation time is less than 30 min;

step 6, separation: performing liquid-solid separation by using a horizontal screw centrifuge 304, removing impurities in the waste mineral oil, enabling the working speed of the horizontal screw centrifuge to be 3200-4000 rpm, enabling the separation factor to be larger than 2800, enabling the differential rotation number to be 2-8 rpm, enabling the retention time to be 5-15 min, enabling a separated liquid phase to flow into a crude oil tank 305, enabling a solid phase and a cleaning residual liquid to flow into a slurry tank 312, enabling a stirrer 316 to uniformly mix the waste mineral oil in the crude oil tank 305, enabling the mixture to enter a disc separator 309 for oil-water-solid three-phase separation, adjusting a back pressure valve 310 to control the water content of an outlet oil phase, enabling the separated oil phase to enter a clean oil tank 311, enabling a solid phase and a deslagging flushing liquid to enter the slurry tank 312, and enabling a water phase to flow into a sewage tank 321;

and 7, purifying: the water and impurities generated by the material fluctuation of the separation unit 3 are removed by a back flush precision filter 403 and a coalescence separator 404, so that the treatment effect of waste mineral oil purification is ensured, the water content in the treated waste mineral oil purified oil is less than 0.3 percent (wt percent), and the solid phase impurity content is less than 0.3 percent (wt percent);

step 8, regeneration: and further removing pollutants, residual additives and colloid asphaltenes in the waste mineral oil by using a membrane filter unit 408 to obtain the high-quality regenerated mineral oil base oil.

The beneficial effects of the above technical scheme are:

the high-quality regenerated mineral oil base oil is obtained by carrying out the process operations of heating, tempering, demulsification, sedimentation, desalination, separation, purification and regeneration on the waste mineral oil to remove pollutants, residual additives, colloid asphaltenes and the like in the waste mineral oil.

Example 7

On the basis of embodiment 1, as shown in fig. 8 to 9, the system further comprises a waste mineral oil storage tank with a cleaning device, wherein the waste mineral oil storage tank with the cleaning device is connected with the instant heating unit 1 in the special device for pretreatment and purification of waste mineral oil, and the waste mineral oil storage tank with the cleaning device comprises:

the power shell 55, an annular groove 5501 is formed in the lower end face of the power shell 55, a sealing sleeve 50 is fixedly connected to the lower end of the power shell 55, the lower end of the sealing sleeve 50 is fixedly connected with a storage tank body 54, and a rotating plate 48 is arranged inside the power shell 55;

an output shaft of the first motor 47 penetrates through the upper end of the power shell 55 and is fixedly connected with the upper end of the rotating plate 48;

the mounting cylinder 49 is fixedly connected with the lower end of the rotating plate 48 through the annular groove 5501, the inner wall of the mounting cylinder 49 is fixedly connected with a mounting plate 4901, the left side and the right side of the lower end of the mounting plate 4901 are symmetrically connected with a second fixing plate 56, a threaded rod 52 is fixedly connected between the second fixing plates 56, and the threaded rod 52 penetrates through the second right fixing plate 56 and is fixedly connected with a second motor 51;

the cutter bar 53 is fixedly connected with a mounting block 5301, and the mounting block 5301 is in threaded connection with the threaded rod 52;

the base 68 is fixedly arranged at the lower end of the storage tank body 54, the cleaning pipe 63 is arranged in the middle of the base 68, the cavities 66 are symmetrically arranged at the left side and the right side of the base 68, the cleaning pipe 63 is not communicated with the cavities 66, the side wall of the left cavity 66 of the base 68 is fixedly connected with a supporting shell 69, and the lower end of the supporting shell 69 is fixedly connected with a supporting block 59;

the telescopic rod of the hydraulic cylinder 57 penetrates through the base 68 and is fixedly connected with the second sliding block 58, the second sliding block 58 is arranged in the supporting shell 69 in a sliding mode, the second sliding block 58 is fixedly connected with the push rod 60, the push rod 60 penetrates through the side wall of the supporting shell 69 and is fixedly connected with the push plate 62, the push plate 62 is of a concave structure, and the front side and the rear side of the lower end of the push plate 62 are symmetrically connected with the push blocks 61;

the closure plate 64, the closure plate 64 runs through the right side wall of clean pipe 63 with clean pipe 63 left side wall contact, both sides symmetric connection has locating piece 65 around the closure plate 64 upper end, locating piece 65 corresponds the setting with ejector pad 61, closure plate 64 right-hand member fixedly connected with spring two 67, spring two 67 with base 68 right side cavity 66 right side wall fixed connection.

The beneficial effects of the above technical scheme are:

the waste mineral oil storage tank with the cleaning device can clean and maintain the inside of the storage tank body 54, when the cleaning device cleans the inside of the storage tank body 54, firstly, the motor I47 is started, the motor I47 drives the rotating plate 48 to rotate, the rotating plate 48 drives the mounting cylinder 49 to rotate, the cutter bar 53 starts to rotate, the motor II 51 is started, the mounting block 5301 is driven to move through the screw 52, the cutter bar 53 moves, the distance from the cutter bar 53 to the inner wall of the storage tank body 54 can be gradually adjusted according to dirt with different thicknesses, the cutter bar 53 slowly approaches to the inner wall of the storage tank body 54, the cutter bar 53 continuously rotates under the driving of the motor I47, the dirt is scraped, the cleaning effect is improved, the distance from the cutter bar 53 to the inner wall of the storage tank body 54 is adjusted, the cutter bar 53 is prevented from being damaged due to too short distance from the inner wall of the storage tank body 54, the bottom of the storage tank body 54 is in an oval shape, the bottom is convenient for the dirt to collect, prevent that the dirt after scraping off is everywhere in storage tank body 54 inside, can't reach cleaning performance, the dirt of scraping off enters in the bottom of storage tank body 54 slips into clean pipe 63, start hydraulic cylinder 57, promote the removal of second sliding block 58, make catch bar 60 promote push pedal 62, drive ejector pad 61 and remove, push pedal 62 is concave structure, the notch of push pedal 62 passes through clean pipe 63 in the removal process, the two mutual noninterference, ejector pad 61 promotes the locating piece 65 and removes, drive closure plate 64 and remove, make the dirt flow out from clean pipe 63, and can clean storage tank body 54 bottom from clean pipe 63, the operation flow that the cleaner got into storage tank body 54 and clear away the dirt has been avoided, the cost is saved, dangerousness is reduced.

Example 8

In addition to embodiment 2, as shown in fig. 10 to 13, the self temperature-controlled dirty oil recovery apparatus 105 includes a dirty oil recovery structure, and the dirty oil recovery structure includes:

the motor comprises a shell 5, wherein a first cavity 501, a second cavity 502, a motor chamber 503, a third cavity 504 and a fourth cavity 505 are arranged in the shell 5, the first cavity 501 is arranged at the left end of the shell 5, the second cavity 505 is arranged in the middle of the shell 5, the third cavity 504 is arranged at the upper part of the right end of the shell 5, the fourth cavity 505 is arranged at the lower part of the right end of the shell 5, the motor chamber 503 is arranged between the second cavity 502 and the third cavity 504, the first cavity 501, the second cavity 502, the motor chamber 503 and the third cavity 504 are sequentially communicated from left to right, and the third cavity 504 and the fourth cavity 505 are communicated from top to bottom;

the double-head motor 9 is arranged in the motor chamber 503, a first rotating shaft 40 is fixedly connected to the left end of the double-head motor 9, the first rotating shaft 40 penetrates through the side wall of the second cavity 502 and enters the first cavity 501, a first bevel gear 7 is fixedly connected to the inside of the first cavity 501, the first bevel gear 7 is meshed with a second bevel gear 6, a rotating shaft 33 is fixedly connected to the second bevel gear 6, and the second rotating shaft 33 is rotatably connected with the lower end of the first cavity 501;

the magnet 32 is fixedly arranged on the right wall of the first cavity 501, the lower end of the magnet 32 is slidably connected with the right wall of the first cavity 501 to form an absorption block 31, the left end of the absorption block 32 is connected with a first gear 30, the first gear 30 is slidably connected with a second rotating shaft 33, the first gear 30 is meshed with a gear 29, the second gear 29 is fixedly connected with a rotating rod 27, the rotating rod 27 penetrates through the lower end of the first cavity 501 to be in threaded connection with the lifting sleeve 26, the lifting sleeve 26 is slidably arranged inside the fixed sleeve 25, and the fixed sleeve 25 is fixedly arranged at the lower end of the outer wall of the first cavity 501;

the centrifugal cylinder 15 is arranged inside the mixing bin 16, the mixing bin 16 is arranged inside the fourth cavity 505, filtering holes 1501 are uniformly distributed on the surface of the centrifugal cylinder 15, a feed inlet 14 is formed in the upper end of the centrifugal cylinder 15, the feed inlet 14 is obliquely arranged and penetrates through the outer wall of the right side of the shell 5 to be communicated with the outside, a third rotating shaft 12 is fixedly connected to the upper end of the centrifugal cylinder 15, the third rotating shaft 12 penetrates through the mixing bin 16 and the fourth cavity 505 to enter the third cavity 504 to be fixedly connected with a fourth bevel gear 13, the fourth bevel gear 13 is meshed with a third bevel gear 11, the third bevel gear 11 is fixedly connected with a fourth rotating shaft 10, and the fourth rotating shaft 10 penetrates through the side wall of the third cavity 504 to be fixedly connected with the right end of the double-head motor 9;

a first fixing plate 28, the first fixing plate 28 is fixedly connected with the lower end of the outer wall of the shell 5, the first fixing plate 28 is fixedly connected with a connecting plate 18, the right end of the connecting plate 18 is fixedly connected with a discharge pipe 17, the upper end of the discharge pipe 17 is rotatably connected with the lower end of the fourth cavity 505,

the lower end of the discharge pipe 17 is arranged corresponding to the left end of the separation bin 19, the left end inside the separation bin 19 is provided with a sedimentation inclined end 21, and the right end inside the separation bin 19 is provided with a water separator 20;

the upper end of the sliding belt 24 penetrates through the bottom end of the second cavity 502 to be connected with a first pulley 8, the first pulley 8 is rotatably connected with the first rotating shaft 40, the left end and the right end of the sliding belt 24 are symmetrically connected with two second pulleys 41, the second pulleys 41 are fixedly connected with a fixed shaft 42, the fixed shaft 42 is fixedly connected with a fixed block 43, the fixed block 43 is slidably arranged at the left end and the right end inside a fixed seat 46, a mounting plate 44 is arranged in the middle inside the fixed seat 46, a first spring 45 is arranged between the mounting plate 44 and the fixed block 43, the lower end of the fixed seat 46 is fixedly connected with the upper end of the connecting plate, the lower end of the sliding belt 24 is connected with a third pulley 23, the third pulley 23 is rotatably connected with a connecting shaft 22, and the connecting shaft 22 penetrates through a sliding groove in the vertical direction of the surface of the fixed sleeve 25 to be fixedly connected with the lifting sleeve 26;

two place jar 36, two are placed jar 36 bottom mounting and are equipped with supporting seat 35, two are placed 36 upper ends of jar fixedly connected with sliding seat 39 respectively, be equipped with sliding tray 37 on the sliding seat 39, sliding tray 37 and a sliding block 38 sliding connection, a sliding block 38 with connecting block 34 fixed connection, connecting block 34 is fixed to be set up both ends about separation chamber 19.

The working principle of the technical scheme is as follows:

when dirty oil flows into the self-temperature-control dirty oil recovery device 105, the dirty oil flows into the centrifugal cylinder 15 through the feed inlet 14, the double-end motor 9 is started, the magnet 32 is in an open state at the moment, the suction block 31 is attached to the magnet 32, the first gear 30 is not meshed with the second gear 29 to drive the rotating shaft four 10 to rotate, the bevel gear three 11 is driven to rotate, the bevel gear four 13 is driven to rotate to drive the rotating shaft three 12 to rotate, the centrifugal cylinder 15 starts to rotate, the dirty oil flowing into the centrifugal cylinder 15 separates impurities in the dirty oil from mineral oil and water under the action of centrifugal force, so that the oil phase and the water phase flow out of the filtering holes 1501 on the surface of the centrifugal cylinder 15, the impurities are retained in the centrifugal cylinder 15, the oil phase and the water phase are mixed together and flow into the mixing bin 16 and flow into the separation bin 19 through the discharge pipe 17, the pipe orifice of the discharge pipe 17 corresponds to the inclined settling end 21 in the separation bin 19, the mineral oil and the water first pass through the settling inclined end 21 to retain a part of water and impurities, the rest water and mineral oil pass through the water separator 20, the water and the mineral oil are separated by utilizing pressure difference according to different densities of the water and the mineral oil, after the water and the mineral oil are separated, the magnet 32 is closed, the suction block 31 slides downwards, the first gear 30 is driven to be meshed with the second gear 29, the first rotating shaft 40 drives the first bevel gear 7 to rotate under the driving of the double-head motor 9, the second bevel gear 6 rotates, the second rotating shaft 33 rotates, the first gear 30 rotates, the second gear 29 rotates, the lifting sleeve 26 moves downwards under the action of the threads of the rotating rod 27, the connecting shaft 22 is driven to move downwards, the separation bin 19 drives the connecting block 34 to move downwards, the connecting block 34 slides downwards along the sliding groove 37, the separation bin 19 is in butt joint with the two placing tanks 36, and the mineral oil and the water flow into the placing tanks 36 respectively to achieve the purpose of recovery.

The beneficial effects of the above technical scheme are:

when the connecting shaft 22 moves downwards, the pulley III 23 is driven to move downwards, the pulley III 23 drives the sliding belt 24 to move, the sliding belt 24 pushes the pulley II 41 to move inwards, the fixing block 43 is driven to move inwards in the fixing seat 46, the spring I45 is compressed, the separation bin 19 ensures a stable state in the descending process, water and mineral oil are prevented from being mixed together due to instability of the separation bin 19 to influence the separation effect, the mineral oil and the water are separated from impurities by arranging the centrifugal cylinder 15 to achieve a filtering effect, the waste mineral oil is conveniently separated and recycled through the separation bin 19, the recycling efficiency of the mineral oil is improved, the separated mineral oil and the separated sewage are conveniently recycled by arranging the two placing tanks 36 respectively, the resource waste and the environmental pollution are avoided, the magnet 32 is arranged, and the ascending and descending of the separation bin 19 are controlled by opening and closing the magnet 32, the rotation of the centrifugal cylinder 15 and the lifting of the separation bin 19 are carried out independently, and the rotation of the centrifugal cylinder 15 and the lifting of the separation bin 19 are realized only through the double-head motor 9, so that the mutual interference between the centrifugal cylinder 15 and the separation bin is avoided, the automatic temperature control sump oil recovery device 105 cannot work normally, and the recovery efficiency is influenced.

The foregoing shows and describes the general principles, general structure and essential features of the invention, together with the advantages thereof. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and are intended to illustrate the basic principles, basic structures and essential features of the invention, but that various changes and modifications may be made without departing from the spirit and scope of the invention, and these changes and modifications are within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.

Claims

1. A waste mineral oil purifier which characterized in that: the system comprises an instant heating unit (1), a conditioning unit (2), a separation unit (3) and a security unit (4), wherein the instant heating unit (1), the conditioning unit (2), the separation unit (3) and the security unit (4) are sequentially communicated through a process pipeline;

the instant heating unit (1) comprises a self-cleaning filter (101), a raw material pump (102), a first flowmeter (103) and a rapid heat exchanger set (104) which are sequentially connected through a process pipeline according to the flow direction of waste mineral oil, wherein the rapid heat exchanger set (104) is connected with the conditioning unit (2), and the self-cleaning filter (101) is communicated with a self-temperature-control dirty oil recovery device (106) through a sewage disposal process pipeline; the raw material pump (102) and the flowmeter I (103) are respectively connected with a flow control valve I (105), a temperature display control instrument I (107) is installed on an outlet pipeline of the rapid heat exchanger group (104), the rapid heat exchanger group (104) is connected with a heat medium flow control valve I (108) through the temperature display control instrument I (107), and the rapid heat exchanger group (104) is one or more spiral plate type heat exchangers;

the conditioning unit (2) comprises a static mixer (201), a conditioning tank (202) and a circulating pump (203) which are sequentially connected through a process pipeline according to the flowing direction of waste mineral oil, the conditioning tank (202) comprises an elliptical head (2001), a cylinder (2002), a conical head (2003) and supporting legs (2004) which are sequentially connected from top to bottom, the lower end of the conical head (2003) is provided with a manhole (2019), a drain outlet (2020), an oil outlet (2021) and a circulating port (2022), the circulating port (2022) is connected with the circulating pump (203) through a process pipeline, and the oil outlet (2021) is connected with the separation unit (3) through a process pipeline; a temperature maintaining heater I (2005) and a coalescing filler (2006) are arranged inside the tempering tank (202), a cyclone (2023) is arranged inside the tempering tank (202), an inlet of the cyclone (2023) is connected with an inlet pipe (2024), a lower outlet of the cyclone (2023) is positioned above a sewage discharge outlet (2020), an upper outlet of the cyclone (2023) faces upwards, and the inlet pipe (2024) is connected with the static mixer (201); the upper end of the tempering tank (202) is provided with a fire-retardant breather valve I (2010), an emergency relief valve (2011), a light hole (2012), an oil metering hole (2013), an oil-water interface control instrument 2014, a platform (2015) and a ladder stand (2016), the side end of the tempering tank (202) is provided with a temperature display control instrument II (2007), a PH value display control instrument (2008), a liquid level control instrument I (2009) and a plurality of standing wave ultrasonic auxiliary demulsification and sedimentation devices (2017) which are uniformly distributed, and the temperature display control instrument II (2007) is connected with the temperature maintaining heater I (2005) through a heat medium flow regulating valve II (2018);

the security unit (4) comprises a feeding pump (401), a second flow meter (402), two backwashing precision filters (403), a coalescing separator (404), a temporary storage tank (405), an output pump (406), a third flow meter (418) and a membrane filter unit (408) which are sequentially connected through a process pipeline according to the flow direction of the waste mineral oil.

2. The waste mineral oil purifying apparatus according to claim 1, wherein: the instant heating unit (1) and the tempering unit (2) are arranged on a lower-layer platform, the separation unit (3) and the security unit (4) are arranged on an upper-layer platform, and the lower-layer platform and the upper-layer platform are combined to form a two-layer process frame platform;

3. The waste mineral oil purifying apparatus according to claim 1, wherein: the conditioning unit (2) can be connected in one or more parallel connection modes, a plurality of medicament adding ports are formed in the static mixer (201), the static mixer (201) is connected with an automatic medicament adding device (204) through the medicament adding ports, and the circulating pump (203) is connected with the static mixer (201) through a process pipeline.

4. The waste mineral oil purifying apparatus according to claim 1, wherein: the separation unit (3) comprises a horizontal spiral feed pump (301), a horizontal spiral flow meter (302), a three-way valve (303), a horizontal spiral centrifuge (304), a crude oil tank (305), a disc feed pump (306), a disc flow meter (307), a fiber filter (308), a disc separator (309), a back pressure valve (310) and an oil purification tank (311) which are sequentially connected through a process pipeline according to the flow direction of waste mineral oil, wherein the horizontal spiral feed pump (301) is connected with the conditioning unit (2) through the process pipeline, the horizontal spiral feed pump (301) is connected with a second flow regulating valve (319), and the second flow regulating valve (319) is connected with the horizontal spiral flow meter (302); the horizontal screw centrifuge (304) is respectively connected with a crude oil tank (305) and a slurry tank (312), a temperature display control instrument III (313), a fire-retardant breather valve II (314), a liquid level control instrument II (315) and a stirrer (316) are arranged outside the crude oil tank (305), a temperature maintaining heater II (317) is arranged inside the crude oil tank (305), and the temperature display control instrument III (313) is connected with the temperature maintaining heater II (317) through a heat medium flow regulating valve III (318); the disc feed pump (306) is connected with a flow regulating valve III (320), and the flow regulating valve III (320) is connected with the disc flowmeter (307); disc separator (309) is connected with respectively oil purification jar (311), sediment thick liquid jar (312) and sewage tank (321), the outside of oil purification jar (311) sets up back-fire relief breather valve three (322), liquid level control instrument three (323) and temperature display control instrument four (324), the inside of oil purification jar (311) sets up dimension temperature heater three (325), temperature display control instrument four (324) through heat medium flow control valve four (326) with dimension temperature heater three (325) are connected, oil purification jar (311) are connected with security unit (4) through the process line.

5. The waste mineral oil purifying apparatus according to claim 1, wherein: the feed pump (401) is connected with the separation unit (3) through a process pipeline, the feed pump (401) is connected with a flow regulating valve five (407), and the flow regulating valve five (407) is connected with the flow meter two (402); the two backwashing precision filters (403) are arranged in parallel, and the two backwashing precision filters (403) are respectively connected with an adjustable differential pressure instrument (409); a first liquid level display control instrument (410) and a heater (411) are arranged at a water collecting part of the coalescence separator (404); a fire-retardant breather valve IV (412), a liquid level display control instrument II (413) and a temperature display control instrument V (414) are arranged outside the temporary storage tank (405), a temperature maintaining heater IV (415) is arranged inside the temporary storage tank (405), and the temperature display control instrument V (414) is connected with the temperature maintaining heater IV (415) through a heat medium flow regulating valve V (416); the output pump (406) is connected with a flow regulating valve four (417), the flow regulating valve four (417) is connected with the flowmeter three (418), the output pump (406) is connected with a membrane filter unit (408), and the membrane filter unit (408) is connected with the automatic temperature control dirty oil recovery device (106).

6. A purification method of a waste mineral oil purification apparatus as described in any one of claims 1 to 5, characterized in that: the method comprises the following steps:

step 1, heating: removing mechanical impurities with the particle size larger than 1mm from the waste mineral oil through an instant heating unit (1), heating to 70-90 ℃, entering a tempering tank (202), and keeping the temperature of the oil in the tempering tank (202) at 70-90 ℃;

step 2, tempering: adding a PH regulator into a conditioning tank (202) by using an automatic reagent adding device (204), uniformly mixing by using a circulating pump (203) through a static mixer (201), separating solid impurities by using a cyclone (2023), adjusting the pH value of waste mineral oil in the conditioning tank (202) to be 7-9, adding fresh water into the conditioning tank (202) by using the automatic reagent adding device (204), wherein the addition amount of the fresh water is 5-8% of the oil amount in the conditioning tank (202), uniformly mixing by using the circulating pump (203) through the static mixer (201), and separating the solid impurities by using the cyclone (2023);

step 3, demulsification: adding a demulsifier into a conditioning tank (202) through an automatic medicament adding device (204), uniformly mixing the demulsifier with a circulating pump (203) through a static mixer (201), separating solid impurities through a cyclone (2023), starting a standing wave ultrasonic auxiliary demulsification and sedimentation device, wherein the oil temperature is 70-90 ℃, the ultrasonic sound intensity is 0.25-0.65W/cm 2, the working frequency is 18 KHz-50 KHz, the pulse width is 5-10 ms, and the irradiation time is less than 30 min;

step 4, settling: keeping the temperature of the oil in the tempering tank (202) at 70-90 ℃, standing for 2-8 h, and discharging water and impurities settled on the lower layer of the tempering tank (202);

and 5, desalting: fresh water is added into a conditioning tank (202) through an automatic reagent adding device (204), the adding amount of the fresh water is 5% -8% of the oil amount in the tank, meanwhile, a circulating pump (203) is used for uniformly mixing through a static mixer (201), solid impurities are separated through a cyclone (2023), a standing wave ultrasonic auxiliary demulsification and sedimentation device is started, the oil temperature is 70-90 ℃, the ultrasonic sound intensity is 0.25-0.65W/cm 2, the working frequency is 18 KHz-50 KHz, the pulse width is 5-10 ms, and the irradiation time is less than 30 min;

step 6, separation: performing liquid-solid separation by using a horizontal screw centrifuge (304), removing impurities in the waste mineral oil, enabling the working speed of the horizontal screw centrifuge to be 3200-4000 rpm, enabling the separation factor to be larger than 2800, enabling the differential rotation number to be 2-8 rpm, enabling the retention time to be 5-15 min, enabling a separated liquid phase to flow into a crude oil tank (305), enabling a solid phase and a cleaning residual liquid to flow into a slurry tank (312), enabling a stirrer (316) to uniformly mix the waste mineral oil in the crude oil tank (305), enabling the mixed waste mineral oil to enter a disc separator (309) for oil-water-solid three-phase separation, adjusting a back pressure valve (310) to control the water content of an outlet oil phase, enabling the separated oil phase to enter a clean oil tank (311), enabling a solid phase and a slag discharge flushing liquid to enter the slurry tank (312), and enabling a water phase to flow into a sewage tank (321);

and 7, purifying: removing water and impurities generated by material fluctuation of the separation unit (3) by using a back flush precision filter (403) and a coalescence separator (404), ensuring the treatment effect of waste mineral oil purification, wherein the water content in the treated waste mineral oil purified oil is less than 0.3 percent (wt%), and the solid phase impurity content is less than 0.3 percent (wt%);

step 8, regeneration: and further removing pollutants, residual additives and colloid asphaltenes in the waste mineral oil by using a membrane filter unit (408) to obtain the high-quality regenerated mineral oil base oil.