WO1999062617A1 - Method for vibrational cleaning a liquid of foreign particles - Google Patents

Method for vibrational cleaning a liquid of foreign particles Download PDF

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Publication number
WO1999062617A1
WO1999062617A1 PCT/UA1998/000016 UA9800016W WO9962617A1 WO 1999062617 A1 WO1999062617 A1 WO 1999062617A1 UA 9800016 W UA9800016 W UA 9800016W WO 9962617 A1 WO9962617 A1 WO 9962617A1
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WO
WIPO (PCT)
Prior art keywords
liquid
wave
propagating
cleaning
processed
Prior art date
Application number
PCT/UA1998/000016
Other languages
French (fr)
Inventor
Jury Redkoborody
Original Assignee
Jury Redkoborody
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 Jury Redkoborody filed Critical Jury Redkoborody
Priority to AU15814/99A priority Critical patent/AU1581499A/en
Publication of WO1999062617A1 publication Critical patent/WO1999062617A1/en

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D21/00—Separation of suspended solid particles from liquids by sedimentation
    • B01D21/28—Mechanical auxiliary equipment for acceleration of sedimentation, e.g. by vibrators or the like
    • B01D21/283—Settling tanks provided with vibrators
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M175/00—Working-up used lubricants to recover useful products ; Cleaning
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N30/00—Investigating or analysing materials by separation into components using adsorption, absorption or similar phenomena or using ion-exchange, e.g. chromatography or field flow fractionation
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N30/00—Investigating or analysing materials by separation into components using adsorption, absorption or similar phenomena or using ion-exchange, e.g. chromatography or field flow fractionation
    • G01N30/02—Column chromatography

Definitions

  • the invention relates to a method for vibrational cleaning liquids of suspended foreign particles and can be used for cleaning water, oil, liquid fuels, lubricants, food oils, foods, liquid industrial wastes of microparticles sized of more than 0,01 ⁇ m.
  • a method for acoustic cleaning a liquid of foreign inclusions such method being based on a phenomena of acoustic drift of solid particles, suspended in liquid, under the influence of a propagating acoustic wave.
  • the said method includes generating and maintaining in a volume of the cleaned liquid a propagating acoustic wave, such wave being obtained by means of its generating in one part and its artificial attenuating in another part of the processed volume of the liquid.
  • the described method provides for a practically complete withdrawal from any liquid of foreign microparticles of any physical nature sized of 0,01 and more m.
  • resulting from a comparatively small speed of the drift which limits the productivity of respective apparatus, this necessitates high energy consumptions (about 1 kW-hr per 1 litre of cleaned liquid).
  • high energy consumptions about 1 kW-hr per 1 litre of cleaned liquid.
  • the density of acoustic energy flow is of the order of 20 W/cm 2
  • the drift speed of particles suspended in water is of the order of
  • the object of the invention is to substantially reduce energy consumptions for cleaning a liquid of foreign microparticles, while at the same time to safeguarde the universality of the above mentioned acoustic method.
  • this problem is solved by means that while realizing the method for vibrational cleaning a liquide of foreign microparticles, which method includes producing and maintaining in a volume of the cleaned liquid a propagating mechanical wave, such wave being produced by means of its generating in one part and its artificial attenuating in another part of the processed volume of the liquid, the cleaned liquid, in contrast to the prior art, is processed while having in the zone of propagation of the said mechanical wave a free interface, and that the frequency of this wave is set up below the acoustic diapason.
  • this mechanical wave has a frequency within the range of between 0.1 and 5 Hz.
  • the said free interface may be a liquid-gas interface or interface between two liquids, different, for instance, as to their chemical composition, concentration of solutes or physical properties.
  • a amplitude of the propagating wave
  • ⁇ wavelength
  • g acceleration of gravity
  • A mean depth of the liquid .
  • the speed (V) of its flow in the processing zone is to be set not exceeding the rate (V d ) of the opposite drift of the microparticles
  • Fig.1 and 2 represent devices, which may realize the proposed method respectively for discontinuous and continuous cleaning a liquid of therein suspended microparticles.
  • the device represented in fig.1 has an operative reservoir (1) for the processed liquid (2).
  • a generator of low-frequency mechamcal wave (3) is installed on the left end of the reservoir (1), as represented in the drawing, while an absorber of mechanical waves (4) is installed on the right end of it.
  • the operative reservoir (1) is additionally provided with two openings for inflow and outflow of the cleaned liquid with the respective inlet and outlet connections (5) and (6), the inlet connection (5) being installed nearer to the absorber (4) and the outlet connection (6) - nearer to the mechanical vibrator (3).
  • the operative reservoir (1) according to fig.1, 4 m long, 1 m wide and 1 m deep was filled to the depth of 0.5 meter with clear water, and over the water with a 10 cm high layer of waste lubricant oil containing particles of 0.1 to 3 ⁇ m.
  • the vibrator (3) initiated in the operative reservoir (1) a propagating wave with a frequency of 2.9 Hz and amplitude of 10 cm, which wave was absorbed at the opposite end by the absorber (4).
  • the rate of vibrational drift of microparticles under the said parameters of the gravity wave is of the order of 0.04 cm/s. Due to this fact, the time of oil processing was fixed equal to 3 hours. Analyses of probes of the oil taken in the middle of the reservoir did not reveal any traces of foreign particles. The processing had taken 7 kW-hr of electric energy, which makes 0.017 kW-hr per one litre.
  • the invention can be used for cleaning water, oil, liquid fuels, lubricants, food oils, liquid foods, liquid industrial wastes of microparticles sized of more than 0,01 ⁇

Abstract

The method for vibrational cleaning liquids of suspended foreign particles may be used for cleaning water, oil, liquid fuels, lubricants, food oils, foods, liquid industrial wastes of microparticles sized of more than 0,01 νm. The proposed method includes generating and maintaining in a volume of the cleaned liquid (2) a propagating mechanical wave, such wave being obtained by means of its generating (3) in one part and its artificial attenuating (4) in another part of the processed volume of the liquid. A substantil reducing of energy consumption for cleaning a liquid of foreign microparticles is achieved by means of that the liquid is processed while having in the zone of propagating of the said mechanical wave a free interface, and that the frequency of this wave is set up below the acoustic diapason. The invention can be widely used both in industries and in housekeeping.

Description

METHOD FOR VEBRATIONAL CLEANING A LIQUIDE OF FOREIGN PARTICLES
Technical field
The invention relates to a method for vibrational cleaning liquids of suspended foreign particles and can be used for cleaning water, oil, liquid fuels, lubricants, food oils, foods, liquid industrial wastes of microparticles sized of more than 0,01 μ m.
Background art
In my Ukrainian Patent Application No.95083830/3/6613 of August 16, 1995, published on August 29, 1997, a method is described for acoustic cleaning a liquid of foreign inclusions,such method being based on a phenomena of acoustic drift of solid particles, suspended in liquid, under the influence of a propagating acoustic wave. The said method includes generating and maintaining in a volume of the cleaned liquid a propagating acoustic wave, such wave being obtained by means of its generating in one part and its artificial attenuating in another part of the processed volume of the liquid.
The described method provides for a practically complete withdrawal from any liquid of foreign microparticles of any physical nature sized of 0,01 and more m. However, resulting from a comparatively small speed of the drift, which limits the productivity of respective apparatus, this necessitates high energy consumptions (about 1 kW-hr per 1 litre of cleaned liquid). For instance, if the density of acoustic energy flow is of the order of 20 W/cm2 , the drift speed of particles suspended in water is of the order of
0.01 cm/s. Disclosure of the invention
The object of the invention is to substantially reduce energy consumptions for cleaning a liquid of foreign microparticles, while at the same time to safeguarde the universality of the above mentioned acoustic method.
According to the proposed invention this problem is solved by means that while realizing the method for vibrational cleaning a liquide of foreign microparticles, which method includes producing and maintaining in a volume of the cleaned liquid a propagating mechanical wave, such wave being produced by means of its generating in one part and its artificial attenuating in another part of the processed volume of the liquid, the cleaned liquid, in contrast to the prior art, is processed while having in the zone of propagation of the said mechanical wave a free interface, and that the frequency of this wave is set up below the acoustic diapason.
Advantageously this mechanical wave has a frequency within the range of between 0.1 and 5 Hz.
The said free interface may be a liquid-gas interface or interface between two liquids, different, for instance, as to their chemical composition, concentration of solutes or physical properties.
During discontinuous cleaning of a liquid, some time after the establishment of the operative conditions all the foreign inclusions accumulate by the side of the reservoir, opposite to the generator of the mechanical wave, wherefrom they can be extracted by any appropriate means.
According to the proposed invention there also can be used a continuous cleaning, by which a flow of processed liquid is created opposite to the direction of propagation of the mechanical wave. In agreement with the results of our analitical, numerical and laboratorial studies, the microparticles, suspended in a liquid, under the influence of a propagating mechanical wave (so-called gravity wave), along with oscillatory movements, take part in a horizontal drift in the wake of the propagating wave. The speed of this drift Vd is the same for all particles, independent of their size, and may be represented as:
Figure imgf000005_0001
where a is amplitude of the propagating wave, λ is wavelength, g is acceleration of gravity, A is mean depth of the liquid .
In case of continuous cleaning of a liquid, the speed (V) of its flow in the processing zone is to be set not exceeding the rate (Vd) of the opposite drift of the microparticles
(V< Vd), wherefore the liquid, leaving the processing zone, is completely cleaned of the microparticles previously kept thereby.
Brief description of the drawings
Fig.1 and 2 represent devices, which may realize the proposed method respectively for discontinuous and continuous cleaning a liquid of therein suspended microparticles.
Best mode for carrying out of the invention
The device represented in fig.1 has an operative reservoir (1) for the processed liquid (2). A generator of low-frequency mechamcal wave (3) is installed on the left end of the reservoir (1), as represented in the drawing, while an absorber of mechanical waves (4) is installed on the right end of it. In the device illustrated by the fig.2 the operative reservoir (1) is additionally provided with two openings for inflow and outflow of the cleaned liquid with the respective inlet and outlet connections (5) and (6), the inlet connection (5) being installed nearer to the absorber (4) and the outlet connection (6) - nearer to the mechanical vibrator (3).
Example
The operative reservoir (1) according to fig.1, 4 m long, 1 m wide and 1 m deep was filled to the depth of 0.5 meter with clear water, and over the water with a 10 cm high layer of waste lubricant oil containing particles of 0.1 to 3 μ m. The vibrator (3) initiated in the operative reservoir (1) a propagating wave with a frequency of 2.9 Hz and amplitude of 10 cm, which wave was absorbed at the opposite end by the absorber (4).
According to the formula [1] the rate of vibrational drift of microparticles under the said parameters of the gravity wave is of the order of 0.04 cm/s. Due to this fact, the time of oil processing was fixed equal to 3 hours. Analyses of probes of the oil taken in the middle of the reservoir did not reveal any traces of foreign particles. The processing had taken 7 kW-hr of electric energy, which makes 0.017 kW-hr per one litre.
Industrial applicability
The invention can be used for cleaning water, oil, liquid fuels, lubricants, food oils, liquid foods, liquid industrial wastes of microparticles sized of more than 0,01 μ

Claims

C L A I M S
1. A method for vibrational cleaning a liquid of foreign particles, which method includes generating and maintaining in a volume of the cleaned liquid a propagating mechamcal wave, such wave being obtained by means of its generating in one part and its artificial absorbing in another part of the processed volume of the liquid, characterized in that the cleaned liquid is processed while having in the zone of propagating the said mechamcal wave a free interface, and that the frequency of this wave is set up below the acoustic diapason.
2. A method according to Claim 1, characterized in that this mechanical wave has frequency within the range of between 0.1 and 5 Hz.
3. A method according to Claim 1 , characterized in that the liquid is cleaned while flowing in a direction, opposite to the direction of propagation of the mechanical wave, the speed of this flow V being set up in agreement with the following condition:
a
V < " I t
where a is amplitude of the propagating wave, ╬╗ is wavelength, g is acceleration of gravity, h is mean depth of the liquid .
PCT/UA1998/000016 1998-06-02 1998-10-01 Method for vibrational cleaning a liquid of foreign particles WO1999062617A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU15814/99A AU1581499A (en) 1998-06-02 1998-10-01 Method for vibrational cleaning a liquid of foreign particles

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
UA98062842 1998-06-02
UA98062842 1998-06-02

Publications (1)

Publication Number Publication Date
WO1999062617A1 true WO1999062617A1 (en) 1999-12-09

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Country Link
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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4055491A (en) * 1976-06-02 1977-10-25 Porath Furedi Asher Apparatus and method for removing fine particles from a liquid medium by ultrasonic waves
US4280823A (en) * 1979-11-13 1981-07-28 Honeywell Inc. Method and apparatus for sonic separation and analysis of components of a fluid mixture
EP0292470A1 (en) * 1987-05-19 1988-11-23 Wolfgang Dipl.-Ing. Stuckart Process for separating substances from liquids and apparatus for carrying out the process
US4948497A (en) * 1988-05-18 1990-08-14 General Atomics Acoustically fluidized bed of fine particles

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4055491A (en) * 1976-06-02 1977-10-25 Porath Furedi Asher Apparatus and method for removing fine particles from a liquid medium by ultrasonic waves
US4280823A (en) * 1979-11-13 1981-07-28 Honeywell Inc. Method and apparatus for sonic separation and analysis of components of a fluid mixture
EP0292470A1 (en) * 1987-05-19 1988-11-23 Wolfgang Dipl.-Ing. Stuckart Process for separating substances from liquids and apparatus for carrying out the process
US4948497A (en) * 1988-05-18 1990-08-14 General Atomics Acoustically fluidized bed of fine particles

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