GB2139121A - Centrifugal cleaning of used mineral oils - Google Patents

Centrifugal cleaning of used mineral oils Download PDF

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Publication number
GB2139121A
GB2139121A GB08409268A GB8409268A GB2139121A GB 2139121 A GB2139121 A GB 2139121A GB 08409268 A GB08409268 A GB 08409268A GB 8409268 A GB8409268 A GB 8409268A GB 2139121 A GB2139121 A GB 2139121A
Authority
GB
United Kingdom
Prior art keywords
discharge pipe
solids
centrifugal
drum
inlet
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
GB08409268A
Inventor
Aloys Tenthoff
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
GEA Mechanical Equipment GmbH
Original Assignee
Westfalia Separator GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Westfalia Separator GmbH filed Critical Westfalia Separator GmbH
Publication of GB2139121A publication Critical patent/GB2139121A/en
Withdrawn legal-status Critical Current

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Classifications

    • CCHEMISTRY; METALLURGY
    • C10PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10MLUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M175/00Working-up used lubricants to recover useful products ; Cleaning
    • C10M175/0058Working-up used lubricants to recover useful products ; Cleaning by filtration and centrifugation processes; apparatus therefor
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B04CENTRIFUGAL APPARATUS OR MACHINES FOR CARRYING-OUT PHYSICAL OR CHEMICAL PROCESSES
    • B04BCENTRIFUGES
    • B04B1/00Centrifuges with rotary bowls provided with solid jackets for separating predominantly liquid mixtures with or without solid particles
    • B04B1/10Centrifuges with rotary bowls provided with solid jackets for separating predominantly liquid mixtures with or without solid particles with discharging outlets in the plane of the maximum diameter of the bowl
    • B04B1/14Centrifuges with rotary bowls provided with solid jackets for separating predominantly liquid mixtures with or without solid particles with discharging outlets in the plane of the maximum diameter of the bowl with periodical discharge

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Combustion & Propulsion (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Organic Chemistry (AREA)
  • Centrifugal Separators (AREA)
  • Physical Water Treatments (AREA)

Abstract

In a process for centrifugal cleaning of used mineral oils, the solids - liquid mixture is fed to a centrifugal drum (1) by means of a central inlet (2). Solids and water are collected in the solids zone (5) of the drum and the cleaned oil is removed from the central area of the drum by means of a first discharge pipe (9) and a smaller partial oil flow is removed from the peripheral area of the drum by means of passages (7) and a second discharge pipe (10) and is returned to the inlet (2). As soon as the water level in the centrifugal drum reaches the start of the passages (7), water flows in the second discharge pipe (10). This is detected by a conductivity meter (12) located in the second discharge pipe and brings about the switching over of a changeover valve (11) also located in said pipe, so that the return to the inlet is interrupted. <IMAGE>

Description

SPECIFICATION Process and apparatus for the centrifugal cleaning of used mineral oils The invention relates to a process for the centrifugal cleaning of used mineral oils particularly heavy oils contaminated by dirt and water, whilst using an automatically discharging separator, whose centrifugal drum receives the solids - liquid mixture by means of a central inlet having a first discharge pipe for the liquid drawn from the central area of the centrifugal drum and a second discharge pipe for the liquid drawn off from the peripheral area of the centrifugal drum by means of passages.
Processes of the aforementioned type are generally known, the liquid levels of the liquids drawn from the central and peripheral areas being selected in such a way that there is a so-called separating zone within the centrifugal drum between the specifically heavier water and specifically lighter oil. This separation zone must be located in the vicinity of the feed zone for the centrifugal liquid into the disc stack, in order to achieve an optimum separation effect. If materials with different density differences are to be cleaned or purified, it is necessary to modify the setting of the outlet diameter for the two phases.
Before the start of separation and following each complete emptying, the centrifugal drum must initially be filled with water, in orderto seal offthe outlet from the peripheral area for the oil. This involves a corresponding fresh water consumption.
Another problem is the risk of the oil phase getting into the peripheral area of the drum, which not only leads to oil passing out of the outlet for the water phase and being lost, but also means that the waste water is contaminated. This risk of oil getting through is more particularly encountered when cleaning heavy oils, whose densities are in the range of water, so that it is in part necessary to add heavy water in the form of MgSO4, in order to ensure a completely satisfactory separation. Only oils having a maximum density of 0.991 g/cm3 can be centrifugally cleaned with the known processes without adding MgSO4. Since, for cost reasons, there is an increasing trend towards the use of heavy oils, the problem of the maximum permitted oil density for centrifugal cleaning has become particularly acute.
The problem of the invention is therefore to provide a process enabling oils with a higher density than 0.991 g/cm3 to be centrifugally cleaned in a reliable and loss-free manner. In addition, there is no need to supply water before the start of separation and after emptying processes have taken place, whilst there is no need for the setting of the separation zone.
According to the invention this problem is solved in that solids and water are collected in the solids area of the centrifugal drum and the liquid removed from the peripheral area is returned to the inlet for as long as oil flows out and the return is brought to an end as soon as water flows out.
Due to the fact that the drum is not filled with water before the start of separation, initially cleaned oil flows out of both liquid outlets. Dirt and water collect in the solids area or chamber of the centrifugal drum. As soon as the water reaches the channels for the outflow of liquid from the peripheral area, the way is blocked for the oil and only water passes out of the second discharge pipe. By measuring the conductivity of the outflowing liquid, this change can be established and a changeover valve can be switched over. The return of this liquid flow to the separator inlet is stopped for as long as water is flowing out. If the discharge channels coming from the peripheral area become clogged by collected solids, the liquid flow in the passages and in the second discharge pipe is interrupted.This interruption is detected by a suitable monitoring device and starts the emptying of the centrifugal drum. This cycle is continuously repeated. The process according to the invention consequently permits the optimization of the operation of the centrifugal drum, not only with respect to the cleaning of heavy oils, but simultaneously makes it possible to sense the volume of solids deposited in the centrifugal drum and to initiate an emptying or discharge in good time.
A further advantage provided by the invention is that it is possible to operate with separating temperatures above 1 00 C, because there can be virtually no water evaporation and evaporation cannot influence the separation zone within the centrifugal drum required in the hitherto known processes. As the water content of heavy oils is generally below 1%, following each emptying or discharge, the centrifugal drum initially functions as a clarifying separator, no water being able to evaporate due to the high pressure in the centrifugal drum.
The apparatus for performing the process is characterized in that the second discharge pipe for the liquid coming from the peripheral area of the centrifugal drum is connected to the inlet for the supplied solids - liquid mixture. A changeover valve is provided in the second discharge pipe, which makes it possible to lead the outflowing liquid to some other random point in the installation, instead of to the inlet. The second discharge pipe is provided with a constriction, in order to set the discharge pressure and quantity. The pressure is monitored by a pressure switch located in the discharge pipe. A conductivity meter provided in the second discharge pipe makes it possible to establish the type of liquid flowing in the said pipe.
The invention is described in greater detail hereinafter relative to the drawing, which shows an embodiment according to the invention.
Centrifugal drum 1 is provided with a central inlet 2, through which the solids - liquid mixture is supplied to the centrifugal area or chamber 3, which comprises the separation zone 4 and the solids zone 5, the clarified liquid is removed on the one hand from the central area of the centrifugal drum by means of a paring disk 6 and on the other hand from the peripheral area thereof by means of passages 7 and a paring disk 8. Paring disk 6 is connected to a first discharge pipe 9, through which the cleaned oil is returned to the installation for further use. A second discharge pipe 10 associated with paring disk 8 is connected to inlet 2 in such a way that the liquid flow drawn off from the peripheral area of centrifugal drum 1 is returned to the latter. A changeover valve 11 in the second discharge pipe 10 also makes it possible to drain off the liquid flow to another random point.The second discharge pipe 10 is also equipped with a conductivity meter 12, a pressure switch 13 and a constriction 14. Solids zone 5 is peripherally provided with discharge openings 15, which can be opened or closed by an axially movable sliding piston 16.
Cleaned oil flows out of the two discharge pipes 9 and 10 at the start of separation, because the solids and water initially collect in solds zone 5. Changeover valve 11 is switched in such a way that the oil is returned to inlet 2. The outflowing liquid quantity is set to a relatively low value by means of constriction 14. When sufficient water has collected in solids zone 5 for the water level to reach passages 7, water flows out of the second discharge pipe 10 instead of oil. This is detected by the conductivity meter 12, and this information is supplied to a not shown control unit, which brings about the switching over of changeover valve 11 and consequently interrupts the return to inlet 2. If the solids level also reaches the inlet point to channel 7 the liquid flow in the second discharge pipe 10 is interrupted. The resulting pressure reduction in the second discharge pipe is indicated to the control unit by means of pressure switch 13 and the emptying of the centrifugal drum is started. The possible short pressure drop on changing from oil to water discharge in the second discharge pipe 10 is suppressed in known manner by a time lag provided in the control unit.

Claims (7)

1. A process for the centrifugal cleaning of used mineral oils, particularly heavy oils contaminated by dirt and water, whilst using an automatically discharging separator, whose centrifugal drum receives the solids - liquids mixture by means of a central inlet having a first discharge pipe for the liquid drawn from the central area of the centrifugal drum and a second discharge pipe for the liquid drawn off from the peripheral area of the centrifugal drum by means of passages, wherein solids and water are collected in the solids area of the centrifugal drum and the liquid removed from the peripheral area is returned to the inlet for as long as oil flows out and the return is brought to an end as soon as water flows out.
2. A process according to claim 1, wherein when the passages leading out of the peripheral area are closed by the solids in the drum and the liquid flow flowing out of the second discharge pipe is inter rupted as a result thereof, a pulse is emitted, which initiates the automatic discharge of the centrifugal drum.
3. An apparatus for performing the process according to claims 1 and 2, wherein the second discharge pipe is connected to the inlet.
4. An apparatus according to claim 3, wherein a changeover valve is provided in the second dis charge pipe.
5. An apparatus according to claims 3 and 4, wherein a conductivity meter is provided in the second discharge pipe.
6. An apparatus according to one of the claims 3 to 5, wherein a pressure switch is provided in the second discharge pipe.
7. An apparatus according to one of the claims 3 to 6, wherein the second discharge pipe is provided with a constriction.
List of reference numerals 1 Centrifugal drum 2 Inlet 3 Centrifugal area or chamber 4 Separation zone 5 Solids zone 6 Paring disk 7 Passage 8 Paring disk 9 First discharge pipe 10 Second discharge pipe 11 Changeover valve 12 Conductivity meter 13 Pressure switch 14 Constriction 15 Discharge opening 16 Sleeve valve
GB08409268A 1983-04-23 1984-04-10 Centrifugal cleaning of used mineral oils Withdrawn GB2139121A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19833314859 DE3314859A1 (en) 1983-04-23 1983-04-23 METHOD AND DEVICE FOR CENTRIFUGAL CLEANING OF USED MINERAL OILS

Publications (1)

Publication Number Publication Date
GB2139121A true GB2139121A (en) 1984-11-07

Family

ID=6197258

Family Applications (1)

Application Number Title Priority Date Filing Date
GB08409268A Withdrawn GB2139121A (en) 1983-04-23 1984-04-10 Centrifugal cleaning of used mineral oils

Country Status (8)

Country Link
BE (1) BE899360A (en)
BR (1) BR8401846A (en)
DE (1) DE3314859A1 (en)
ES (1) ES8502154A1 (en)
FR (1) FR2544740A1 (en)
GB (1) GB2139121A (en)
IT (1) IT1178930B (en)
NL (1) NL8401245A (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2584415A1 (en) * 1985-07-04 1987-01-09 Westfalia Separator Ag PROCESS AND DEVICE FOR CENTRIFUGAL PURIFICATION OF WASTE MINERAL OIL
FR2615414A1 (en) * 1987-05-20 1988-11-25 Westfalia Separator Ag SELF-TIPPING CENTRIFUGAL BOWL
FR2626143A1 (en) * 1988-01-27 1989-07-28 Westfalia Separator Ag METHOD AND DEVICE FOR STERILIZING MILK BY CENTRIFUGATION
GB2233258A (en) * 1989-06-29 1991-01-09 Kloeckner Humboldt Deutz Ag Setting the radial liquid level in solid sleeve centrifuges
CN109277206A (en) * 2018-11-12 2019-01-29 无锡中清数控科技有限公司 A kind of portable three-phase sedimentation disk centrifugal separator inner flow passage structure

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1099916A (en) * 1965-08-27 1968-01-17 Alfa Laval Ab Sludge centrifuges
GB1315250A (en) * 1970-12-07 1973-05-02 Alfa Laval Ab Centrifugal separators
GB1359157A (en) * 1970-12-07 1974-07-10 Alfa Laval Ab Centrifugal separators
GB2016963A (en) * 1978-03-25 1979-10-03 Kloeckner Humboldt Deutz Ag Solid sleeve screw centrifuges

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US1318086A (en) * 1919-10-07 And keclaimistg system
US1778831A (en) * 1924-04-29 1930-10-21 Sharples Specialty Co Oil-purifying process
GB279636A (en) * 1926-10-29 1927-11-03 Nevin E Funk Improvements relating to the treatment of lubricating oils
GB409522A (en) * 1933-06-12 1934-05-03 Cornelis Van Grondelle Process of preparing purified lubricating and electrical resistance oil from used or waste oils
GB607739A (en) * 1945-03-03 1948-09-03 Separator Ab Improvements in oil purifying plants for internal combustion engines, gas or steam turbines and the like
US3265212A (en) * 1963-05-09 1966-08-09 Pennsalt Chemicals Corp Process for the purification of rolling mill oil
DE1210744B (en) * 1964-10-01 1966-02-10 Westfalia Separator Ag Procedure and arrangement to prevent excessive heating of the centrifuged material in a solid bowl centrifuge
US3535158A (en) * 1967-10-09 1970-10-20 Cpc International Inc Automatic control of a centrifuge
US3750847A (en) * 1972-05-03 1973-08-07 Master Chemical Corp Method of supplying an aqueous cutting fluid to machine tools
US3819508A (en) * 1973-06-04 1974-06-25 C Mccauley Method of purifying lubricating oils
US3835035A (en) * 1973-07-30 1974-09-10 Auley C Mc Method of purifying lubricating oils
US4033859A (en) * 1975-04-24 1977-07-05 Witco Chemical Corporation Thermal treatment of used petroleum oils
US4069969A (en) * 1976-09-28 1978-01-24 Mitsubishi Kakoki Kaisha, Ltd. Automatic three stage centrifugal sludge separator
JPS5437964A (en) * 1977-08-30 1979-03-20 Mitsubishi Kakoki Kk Centrifugal separator
US4272359A (en) * 1978-11-13 1981-06-09 Waste Lubricating Oils Limited Method and apparatus for re-processing waste oil
DE2926237C2 (en) * 1979-06-29 1981-07-02 Westfalia Separator Ag, 4740 Oelde Self-draining clarification drum
GB2038868B (en) * 1979-11-12 1982-09-22 Waste Lubricating Oils Ltd Method and apparatus for reprocessing waste oils

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1099916A (en) * 1965-08-27 1968-01-17 Alfa Laval Ab Sludge centrifuges
GB1315250A (en) * 1970-12-07 1973-05-02 Alfa Laval Ab Centrifugal separators
GB1359157A (en) * 1970-12-07 1974-07-10 Alfa Laval Ab Centrifugal separators
GB2016963A (en) * 1978-03-25 1979-10-03 Kloeckner Humboldt Deutz Ag Solid sleeve screw centrifuges

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2584415A1 (en) * 1985-07-04 1987-01-09 Westfalia Separator Ag PROCESS AND DEVICE FOR CENTRIFUGAL PURIFICATION OF WASTE MINERAL OIL
FR2615414A1 (en) * 1987-05-20 1988-11-25 Westfalia Separator Ag SELF-TIPPING CENTRIFUGAL BOWL
FR2626143A1 (en) * 1988-01-27 1989-07-28 Westfalia Separator Ag METHOD AND DEVICE FOR STERILIZING MILK BY CENTRIFUGATION
GB2233258A (en) * 1989-06-29 1991-01-09 Kloeckner Humboldt Deutz Ag Setting the radial liquid level in solid sleeve centrifuges
GB2233258B (en) * 1989-06-29 1993-10-06 Kloeckner Humboldt Deutz Ag Solid sleeve centrifuge with adjustable liquid outlets
CN109277206A (en) * 2018-11-12 2019-01-29 无锡中清数控科技有限公司 A kind of portable three-phase sedimentation disk centrifugal separator inner flow passage structure
CN109277206B (en) * 2018-11-12 2023-10-20 无锡水之积工业科技有限公司 Internal flow channel structure of portable three-phase sedimentation disc type centrifugal machine

Also Published As

Publication number Publication date
IT1178930B (en) 1987-09-16
BR8401846A (en) 1984-11-27
IT8467420A1 (en) 1985-10-02
NL8401245A (en) 1984-11-16
DE3314859A1 (en) 1984-10-25
BE899360A (en) 1984-07-31
ES531783A0 (en) 1984-12-16
IT8467420A0 (en) 1984-04-20
ES8502154A1 (en) 1984-12-16
FR2544740A1 (en) 1984-10-26

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