CN111621326A - Device and method for purifying waste mineral oil - Google Patents
Device and method for purifying waste mineral oil Download PDFInfo
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- CN111621326A CN111621326A CN202010616159.1A CN202010616159A CN111621326A CN 111621326 A CN111621326 A CN 111621326A CN 202010616159 A CN202010616159 A CN 202010616159A CN 111621326 A CN111621326 A CN 111621326A
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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
- C10G53/00—Treatment of hydrocarbon oils, in the absence of hydrogen, by two or more refining processes
- C10G53/02—Treatment of hydrocarbon oils, in the absence of hydrogen, by two or more refining processes plural serial stages only
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Abstract
The invention relates to a waste mineral oil purification treatment device which comprises a mixer and a three-phase centrifuge, wherein the mixer comprises a first material inlet, a second material inlet and a mixture outlet, the three-phase centrifuge comprises a mixture inlet, a first outlet, a second outlet and a third outlet, and the mixture outlet of the mixer is connected with the mixture inlet of the three-phase centrifuge. The invention also discloses a method for purifying by using the waste mineral oil purifying device. The invention has simple process flow, good purification effect and high efficiency.
Description
Technical Field
The invention relates to a device and a method for purifying waste mineral oil.
Background
The waste mineral oil is oil which is changed from original physical and chemical properties due to the effects of impurity pollution, oxidation and heat and can not be continuously used and replaced, and comprises waste oil such as recycled mineral oil, engine oil, crude oil, hydraulic oil, vacuum pump oil, diesel oil, gasoline, heat treatment oil, lubricating oil and cooling oil, and has the characteristics of long fraction, wide distillation range and wide variety. The comprehensive utilization of the waste mineral oil has important significance for protecting the ecological environment and improving the utilization rate of oil products.
However, the waste mineral oil has a complicated composition, contains metal ions such as iron, calcium, aluminum, and vanadium, solid impurities such as metal scraps, dust, sand, and fiber, and a large amount of water in addition to the original oil, and is seriously emulsified in oil and water. The waste mineral oil is used as a raw material, and the problems of tower flushing, equipment corrosion, pipeline blockage and the like are easily caused in the process of producing fuel oil and base oil. Therefore, before the waste mineral oil is comprehensively utilized by distillation under reduced pressure, hydrogenation, regeneration, etc., necessary demetallization, dehydration and purification for removing solids are usually carried out.
The existing methods for purifying waste mineral oil mainly comprise the following methods. The first is a heating natural sedimentation method, which is also a method mainly adopted by the waste mineral oil comprehensive utilization manufacturers at present. The method is simplest to implement, but has the defects of long purification period, high steam consumption, low impurity removal rate and the like. The "filtering and flash evaporating" method is another commonly used method for purifying waste mineral oil, and is characterized by that it utilizes the filtering process to remove solid impurity from waste mineral oil, then utilizes the flash evaporating process to remove water from oil. However, the method is not thorough in de-solidification and dehydration, and the recovered oil phase still has a large amount of fine solid particles and emulsified water and is not obvious in the removal of metal ions. The ultrasonic technology is a purification treatment method for waste mineral oil which is started in recent years, can effectively remove water in the waste mineral oil, but has no obvious effect on removing solid impurities and metal ions in the waste mineral oil. In addition, the centrifugal separation technology is an effective purification treatment method for waste mineral oil, and particularly under the action of three-phase separation developed in recent years, the separation of three phases of oil, water and solid can be realized. However, the metal ions are dispersed in the oil phase and cannot be removed from the waste mineral oil by means of centrifugation alone.
These problems of the prior art have limited the industrial application of the purification treatment of waste mineral oils.
Disclosure of Invention
The invention aims to improve and innovate the defects and problems existing in the background technology and provides a simple, efficient and low-cost device and a method for purifying and treating waste mineral oil.
The technical scheme is that the waste mineral oil purification treatment device comprises a mixer and a three-phase centrifuge, wherein the mixer comprises a first material inlet, a second material inlet and a mixture outlet, the three-phase centrifuge comprises a mixture inlet, a first outlet, a second outlet and a third outlet, and the mixture outlet of the mixer is connected with the mixture inlet of the three-phase centrifuge.
The mixer is a static mixer or a stirring tank.
The agitator tank include a jar body and agitating unit, jar body upper portion be provided with first material entry and second material entry, the bottom of the jar body sets up the mixture export, agitating unit include motor, drive shaft, drive gear and at least two sets of removal agitators, every group removes the agitator and includes a driven gear and sets up in the driven gear below, through (mixing) shaft and driven gear connected's blade, the internal wall of jar on be provided with annular internal gear ring, driven gear, drive gear etc. thick and upper and lower face keep equal, the upper and lower two sides of internal gear ring and drive gear respectively set up a apron that covers the tooth, driven gear be pressed from both sides between the apron, the motor set up at the top of the jar body, connect the top of drive shaft.
The three-phase centrifugal machine is a disc type three-phase centrifugal machine or a horizontal spiral three-phase centrifugal machine.
The invention also provides a method for purifying and treating the waste mineral oil, which utilizes the device and comprises the following steps:
preheating waste mineral oil, and contacting and mixing the waste mineral oil with water injection and a demetallizing agent in a feed mixer to ensure that metal ions in the oil are fully acted and combined with the demetallizing agent and then dissolved in water;
and (3) the mixed and contacted oil-water liquid is treated by a three-phase centrifuge to remove water and solid slag in the oil, and metal ions are removed together with the water to obtain the purified waste mineral oil which can be directly subjected to atmospheric and vacuum rectification, hydrogenation or regeneration.
The preheating temperature is 30-120 ℃.
The demetallization agent is polyacrylic acid solution.
The addition amount of the demetallization agent is 0.005-0.5% of the mass fraction of the waste mineral oil.
The water injection amount is 0.5-10% of the weight fraction of the waste mineral oil.
The invention has the advantages and beneficial effects that: firstly, fully mixing the waste mineral oil and the demetallizing agent by a mixer to ensure that metal ions in the oil fully act with the demetallizing agent to generate a water-soluble metal ion complex; secondly, oil, water and solid slag can be quickly and efficiently separated through a three-phase centrifuge, wherein metal ions are removed from the oil together with the water; in addition, the waste mineral oil is purified by the feed mixer and the three-phase centrifuge, the process flow is simple, the cost and the energy consumption are lower, the device scale is small, the purification effect is good, the efficiency is high, and the industrial application is more facilitated.
The conventional stirring structure with a fixed center causes the directional movement of the content, leads to the premature delamination of the content, and the instability (concentration) of the material flowing into the three-phase centrifuge, and influences the centrifugal separation effect. The stirring structure of the invention can automatically change the stirring center, overcomes the defect and is particularly suitable for HW08 dangerous waste type liquid waste mineral oil.
Drawings
Fig. 1 is a schematic view of the overall structure of the embodiment.
Fig. 2 is a schematic diagram of a mixer structure.
FIG. 3 is a schematic view of a partial structure of the stirring apparatus.
Detailed Description
To facilitate an understanding of the invention, the invention will now be described more fully with reference to the accompanying drawings. Preferred embodiments of the present invention are shown in the drawings. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
It will be understood that when an element is referred to as being "disposed" on another element, it can be directly disposed or attached to the other element or intervening elements may also be present. The terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," and the like are used in an orientation or positional relationship indicated in the drawings for ease of description and simplicity of description, but do not indicate or imply that the referenced device or element must have a particular orientation, be constructed in a particular orientation, and be operated.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.
Example 1
As shown in figure 1, the waste mineral oil purification treatment device comprises a mixer 1 and a three-phase centrifuge 2, wherein the mixer 1 is a stirring tank and comprises a tank body 3 and a stirring device, a first material inlet 5 and a second material inlet 6 are arranged at the upper part of the tank body 3, a mixture outlet 7 is arranged at the bottom of the tank body 3, the stirring device comprises a motor 8, a driving shaft 9, a driving gear 10 and at least two groups of movable stirrers 11, each group of movable stirrers 11 comprises a driven gear 12 and blades 14 which are arranged below the driven gear 12 and connected with the driven gear 12 through a stirring shaft 13, an annular inner toothed ring 15 is arranged on the inner wall of the tank body 3, the inner toothed ring 15, the driven gear 12 and the driving gear 10 are of equal thickness and the upper and lower surfaces are level, a cover plate 16 covering teeth is respectively arranged on the upper and lower surfaces of the inner toothed ring 15 and the driving gear 10, the driven gear 12 is clamped between the cover plates 16, and the motor 8 is arranged at the top of the tank body 3 and connected with the top end of the driving shaft 9.
The three-phase centrifuge 2 comprises a mixture inlet 17, a first outlet 18, a second outlet 19 and a third outlet 20, and the mixture outlet 7 of the mixer 1 is connected with the mixture inlet 17 of the three-phase centrifuge 2.
The three-phase centrifugal machine is a disc type three-phase centrifugal machine or a horizontal spiral three-phase centrifugal machine.
Example 2
The method for purifying and treating the waste mineral oil by utilizing the device comprises the following steps:
(1) preheating waste mineral oil (scum generated by a dissolved air flotation process in the petroleum refining process) to 80 ℃, then fully contacting and mixing in an SV type static feed mixer according to the feeding amount of 100 kg/h, 1 kg/h of water injection and 0.2 kg/h of demetallizing agent injection, so that metal ions in the oil and the demetallizing agent are fully acted and combined, and then dissolving in water;
(2) and (3) the mixed and contacted oil-water liquid is subjected to the action of a disc type three-phase centrifuge to remove water and solid slag in the oil, and metal ions are removed together with the water to obtain the purified waste mineral oil.
The water content and solid content of the waste mineral oil raw material and the purified waste mineral oil, and the oil content of the discharged water were measured, and the results are shown in table 1.
TABLE 1
Example 3
A waste mineral oil purification treatment method comprises the following steps:
(1) preheating waste mineral oil (waste mineral oil produced in the centralized disassembly process of an internal combustion engine) to 60 ℃, fully contacting and mixing in an SK type static feed mixer according to the feeding amount of 100 kg/h, 3 kg/h of water injection and 0.01 kg/h of demetallizing agent, and dissolving in water after metal ions in the oil and the demetallizing agent are fully acted and combined;
(2) and (3) the mixed and contacted oil-water liquid is subjected to the action of a disc type three-phase centrifuge to remove water and solid slag in the oil, and metal ions are removed together with the water to obtain the purified waste mineral oil.
The water content and solid content of the waste mineral oil raw material and the purified waste mineral oil, and the oil content of the discharged water were measured, and the results are shown in table 2.
TABLE 2
| Serial number | Test items | Waste mineral oil feedstock | Purified waste mineral oil | External drainage |
| 1 | Water content% | 0.8 | 0.2 | - |
| 2 | Solids content% | 1.2 | 0.1 | - |
| 3 | Oil content, mg/L | 98.0 | 99.7 | 23 |
| 4 | Calcium content, mg/L | 10.5 | 0 | - |
| 5 | Iron content, mg/L | 23 | 0.3 | - |
Example 4
A waste mineral oil purification treatment method comprises the following steps:
(1) preheating waste mineral oil (waste kerosene, diesel oil, gasoline and other solvent oil produced in the process of cleaning metal parts and produced by refining petroleum and coal) to 50 ℃, then fully contacting and mixing in an SX type static feeding mixer according to the feeding quantity of 100 kg/h, the water injection quantity of 5 kg/h and the demetallizing agent injection quantity of 0.05 kg/h, so that metal ions in the oil and the demetallizing agent are fully acted and combined and then dissolved in water;
(2) and (3) the mixed and contacted oil-water liquid is subjected to the action of a disc type three-phase centrifuge to remove water and solid slag in the oil, and metal ions are removed together with the water to obtain the purified waste mineral oil.
The water content and solid content of the waste mineral oil raw material and the purified waste mineral oil, and the oil content of the discharged water were measured, and the results are shown in Table 3.
TABLE 3
| Serial number | Test items | Waste mineral oil feedstock | Purified waste mineral oil | External drainage |
| 1 | Water content% | 3.5 | 0.3 | - |
| 2 | Solids content% | 2.6 | 0.1 | - |
| 3 | Oil content, mg/L | 93.9 | 99.6 | 38 |
| 4 | Calcium content, mg/L | 4.6 | 0 | - |
| 5 | Iron content, mg/L | 53 | 1.2 | - |
Example 5
A waste mineral oil purification treatment method comprises the following steps:
(1) preheating waste mineral oil (waste anti-rust oil generated in the process of performing anti-rust treatment on the surface of a casting by using the anti-rust oil) to 70 ℃, then fully contacting and mixing in an SH type static feeding mixer according to the feeding amount of 100 kg/h, the water injection amount of 2 kg/h and the metal removing agent injection amount of 0.1 kg/h, so that metal ions in the oil and the metal removing agent are fully acted and combined, and then dissolving in water;
(2) and (3) the mixed and contacted oil-water liquid is subjected to the action of a horizontal screw three-phase centrifuge to remove water and solid slag in the oil, and metal ions are removed together with the water to obtain the purified waste mineral oil.
The water content and solid content of the waste mineral oil raw material and the purified waste mineral oil, and the oil content of the discharged water were measured, and the results are shown in Table 4.
TABLE 4
| Serial number | Test items | Waste mineral oil feedstock | Purified waste mineral oil | External drainage |
| 1 | Water content% | 8.9 | 0.4 | - |
| 2 | Solids content% | 5.5 | 0.2 | - |
| 3 | Oil content, mg/L | 85.6 | 99.4 | 92 |
| 4 | Calcium content, mg/L | 6.2 | 0.1 | - |
| 5 | Iron content, mg/L | 72 | 1.5 | - |
Example 6
A waste mineral oil purification treatment method comprises the following steps:
(1) preheating waste mineral oil (floating oil generated in the treatment processes of air flotation, oil removal, flocculation precipitation and the like of petroleum refining wastewater) to 90 ℃, fully contacting and mixing in an SL-type static feeding mixer according to the feeding amount of 100 kg/h, the water injection amount of 8 kg/h and the demetallizing agent injection amount of 0.2 kg/h, and dissolving in water after metal ions in the oil and the demetallizing agent are fully acted and combined;
(2) and (3) the mixed and contacted oil-water liquid is subjected to the action of a horizontal screw three-phase centrifuge to remove water and solid slag in the oil, and metal ions are removed together with the water to obtain the purified waste mineral oil.
The water content and solid content of the waste mineral oil raw material and the purified waste mineral oil, and the oil content of the discharged water were measured, and the results are shown in Table 5.
TABLE 5
| Serial number | Test items | Waste mineral oil feedstock | Purified waste mineral oil | External drainage |
| 1 | Water content% | 39.2 | 0.5 | - |
| 2 | Solids content% | 15.3 | 0.2 | - |
| 3 | Oil content, mg/L | 45.5 | 99.3 | 92 |
| 4 | Calcium content, mg/L | 262 | 1.6 | - |
| 5 | Iron content, mg/L | 38 | 0.5 | - |
The stirred tank used in the examples may in fact also be a static mixer, for example of the SV type, SK type, SX type, SH type or SL type.
The invention mixes the waste mineral oil, water injection and demetallization agent in the feed mixer, to combine the metal ion in the waste mineral oil and demetallization agent, and disperse them in water. The oil phase and the water phase are separated by three-phase centrifugal separation, because metal ions are dispersed in water, the oil-water separation and dehydration process completes demetalization, and simultaneously, the centrifugal separation removes solid residues, thereby realizing the purification treatment process of demetalization, dehydration and solid removal of the waste mineral oil. The method provided by the invention can be used for obtaining the purified waste mineral oil with the contents of metallic calcium ions and iron ions less than 2 mg/L, the solid content less than 0.2 percent and the water content less than 0.5 percent, and can be directly used for carrying out atmospheric and vacuum rectification, hydrogenation or regeneration and the like on the waste mineral oil. In addition, the oil content in the separated wastewater is less than 200 mg/L, and the separated wastewater can be directly conveyed to a sewage treatment system. The method is simple, efficient and low in cost, and provides a new method for purifying and treating the waste mineral oil.
After the waste mineral oil-water mixed liquid enters a three-phase centrifuge, the solid phase is settled by means of centrifugal force, and two liquid phases are layered and are respectively discharged out of the centrifuge body, so that the separation of solid-oil-water three phases is realized. The whole feeding and separating process can be completed under continuous, closed and automatic conditions.
In the step (1), the water injection amount is 0.5-10% of the weight fraction of the waste mineral oil. Preferably, the water injection amount is 1-8% of the weight fraction of the waste mineral oil. The aim of injecting water into the feeding mixer is to dilute and disperse the demetallizing agent, so that the demetallizing agent and the waste mineral oil can be more fully mixed, the probability of collision and contact of the demetallizing agent and metal ions in the waste mineral oil is increased, and the demetallizing effect is improved to the maximum extent. The waste mineral oil and water are preheated before being mixed in the feeding mixer, so that the viscosity of the waste mineral oil is reduced, the fluidity of the waste mineral oil is enhanced, and the waste mineral oil and water can be better mixed in the feeding mixer.
The embodiments of the present invention are described only for the preferred embodiments of the present invention, and not for the limitation of the concept and scope of the present invention, and various modifications and improvements made to the technical solution of the present invention by those skilled in the art without departing from the design concept of the present invention shall fall into the protection scope of the present invention, and the technical content of the present invention which is claimed is fully set forth in the claims.
Claims (9)
1. The utility model provides a waste mineral oil purification unit which characterized in that: the mixer comprises a first material inlet, a second material inlet and a mixture outlet, the three-phase centrifuge comprises a mixture inlet, a first outlet, a second outlet and a third outlet, and the mixture outlet of the mixer is connected with the mixture inlet of the three-phase centrifuge.
2. The waste mineral oil purification treatment apparatus according to claim 1, characterized in that: the mixer is a static mixer or a stirring tank.
3. The waste mineral oil purification treatment apparatus according to claim 1, characterized in that: the agitator tank include a jar body and agitating unit, jar body upper portion be provided with first material entry and second material entry, the bottom of the jar body sets up the mixture export, agitating unit include motor, drive shaft, drive gear and at least two sets of removal agitators, every group removes the agitator and includes a driven gear and sets up in the driven gear below, through (mixing) shaft and driven gear connected's blade, the internal wall of jar on be provided with annular internal gear ring, driven gear, drive gear etc. thick and upper and lower face keep equal, the upper and lower two sides of internal gear ring and drive gear respectively set up a apron that covers the tooth, driven gear be pressed from both sides between the apron, the motor set up at the top of the jar body, connect the top of drive shaft.
4. The waste mineral oil purification treatment apparatus according to claim 1, characterized in that: the three-phase centrifugal machine is a disc type three-phase centrifugal machine or a horizontal spiral three-phase centrifugal machine.
5. A waste mineral oil purification treatment method is characterized by comprising the following steps:
preheating waste mineral oil, and contacting and mixing the waste mineral oil with water injection and a demetallizing agent in a feed mixer to ensure that metal ions in the oil are fully acted and combined with the demetallizing agent and then dissolved in water;
and (3) the mixed and contacted oil-water liquid is treated by a three-phase centrifuge to remove water and solid slag in the oil, and metal ions are removed together with the water to obtain the purified waste mineral oil which can be directly subjected to atmospheric and vacuum rectification, hydrogenation or regeneration.
6. The method for purifying waste mineral oil according to claim 5, wherein: the preheating temperature is 30-120 ℃.
7. The method for purifying waste mineral oil according to claim 5, wherein: the demetallization agent is polyacrylic acid solution.
8. The method for purifying waste mineral oil according to claim 5, wherein: the addition amount of the demetallization agent is 0.005-0.5% of the mass fraction of the waste mineral oil.
9. The method for purifying waste mineral oil according to claim 5, wherein: the water injection amount is 0.5-10% of the weight fraction of the waste mineral oil.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112251281A (en) * | 2020-09-30 | 2021-01-22 | 深圳中环易源科技有限公司 | Production process of waste mineral oil regeneration casting release agent |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107418621A (en) * | 2017-07-12 | 2017-12-01 | 宁波中循环保科技有限公司 | The method for removing metallic compound in waste lubricating oil |
| CN111154510A (en) * | 2020-01-22 | 2020-05-15 | 韦祖军 | Waste mineral oil treatment system and application method thereof |
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2020
- 2020-07-01 CN CN202010616159.1A patent/CN111621326A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107418621A (en) * | 2017-07-12 | 2017-12-01 | 宁波中循环保科技有限公司 | The method for removing metallic compound in waste lubricating oil |
| CN111154510A (en) * | 2020-01-22 | 2020-05-15 | 韦祖军 | Waste mineral oil treatment system and application method thereof |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112251281A (en) * | 2020-09-30 | 2021-01-22 | 深圳中环易源科技有限公司 | Production process of waste mineral oil regeneration casting release agent |
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Application publication date: 20200904 |