EP0270928A2 - Procédé de nettoyage pour un élément isolant - Google Patents

Procédé de nettoyage pour un élément isolant Download PDF

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Publication number
EP0270928A2
EP0270928A2 EP87117444A EP87117444A EP0270928A2 EP 0270928 A2 EP0270928 A2 EP 0270928A2 EP 87117444 A EP87117444 A EP 87117444A EP 87117444 A EP87117444 A EP 87117444A EP 0270928 A2 EP0270928 A2 EP 0270928A2
Authority
EP
European Patent Office
Prior art keywords
solvent
pcb
insulating
cleaning method
liquid
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.)
Granted
Application number
EP87117444A
Other languages
German (de)
English (en)
Other versions
EP0270928B1 (fr
EP0270928A3 (en
Inventor
Gerhard Dipl.-Ing. Sanders
Erwin Dr. Wessling
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.)
ASEA BROWN BOVERI AKTIENGESELLSCHAFT
Original Assignee
BBC Brown Boveri AG Switzerland
Asea Brown Boveri AG Germany
BBC Brown Boveri AG Germany
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 BBC Brown Boveri AG Switzerland, Asea Brown Boveri AG Germany, BBC Brown Boveri AG Germany filed Critical BBC Brown Boveri AG Switzerland
Publication of EP0270928A2 publication Critical patent/EP0270928A2/fr
Publication of EP0270928A3 publication Critical patent/EP0270928A3/de
Application granted granted Critical
Publication of EP0270928B1 publication Critical patent/EP0270928B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B08—CLEANING
    • B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
    • B08B3/00—Cleaning by methods involving the use or presence of liquid or steam
    • B08B3/04—Cleaning involving contact with liquid
    • B08B3/10—Cleaning involving contact with liquid with additional treatment of the liquid or of the object being cleaned, e.g. by heat, by electricity or by vibration
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B08—CLEANING
    • B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
    • B08B3/00—Cleaning by methods involving the use or presence of liquid or steam
    • B08B3/04—Cleaning involving contact with liquid
    • B08B3/10—Cleaning involving contact with liquid with additional treatment of the liquid or of the object being cleaned, e.g. by heat, by electricity or by vibration
    • B08B3/12—Cleaning involving contact with liquid with additional treatment of the liquid or of the object being cleaned, e.g. by heat, by electricity or by vibration by sonic or ultrasonic vibrations
    • 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
    • C10G21/00—Refining of hydrocarbon oils, in the absence of hydrogen, by extraction with selective solvents
    • C10G21/006—Refining of hydrocarbon oils, in the absence of hydrogen, by extraction with selective solvents of waste oils, e.g. PCB's containing oils

Definitions

  • Electrical insulating liquids that consisted of polychlorinated biphenyl - PCB - or contained PCBs were often used in electrical transformers, chokes or capacitors.
  • Known insulating fluids containing PCB have become generally known as Askarele. These ascarels are mixtures of PCB, trichlorobenzene and tetrachlorobenzene.
  • the aforementioned insulating liquids had good electrical properties and flame retardancy, so that a fire in the electrical devices was largely ruled out.
  • the invention is therefore based on the object of specifying a simple possibility for the inexpensive removal of PCB-containing insulating liquids from the pores of such insulating parts.
  • the insulating liquid should not only be removed from those areas of the insulating parts which are close to the surface, rather, the deep-lying areas of the insulating materials should also be cleaned.
  • the solution to this problem is, according to the invention, to use a cleaning method provided for the cleaning of a component which is contaminated on the surface, in which the component is exposed to a liquid solvent which removes the contaminants under the action of ultrasonic waves, for the removal of a polychlorinated biphenyl (PCB) containing Insulating liquid from the pores of a porous, solid electrical insulating part, which was used in an electrical device from the group of transformers, chokes and capacitors and was acted upon by the insulating liquid of the device and which was removed from the device when the electrical device was scrapped, whereby the electrical insulating part in a bath, which contains at least one component from the group of the aliphatic, aromatic, chlorinated and / or fluorinated hydrocarbons as a liquid solvent, with a relative speed between the electrical iso lierteil and the solvent from 0.02 to 0.05 meters per second, preferably 0.05 to 0.15 meters per second, during the period of 8 to 60 minutes, preferably 10 to 30 minutes, and wherein
  • the PCB-containing insulating liquid is removed from the entire pores of the insulating parts, even if the insulating parts have a thickness of 2 to 4 cm or more. Since the PCB-containing insulating liquid is removed from the insulating parts to such an extent that the content drops below 100 ppm, the further elimination or scrapping of these insulating parts is no longer subject to any official regulations.
  • the insulating parts can therefore e.g. can be eliminated by ordinary incineration, with no toxic or harmful emissions.
  • the solvent is kept in a first working stage at the ambient temperature of 15 to 25 ° Celsius, in a subsequent second working stage is heated to an average temperature which is approximately in the middle between the final temperature and the ambient temperature, and heated to the final temperature in a third stage.
  • the first stage is about 10 to 30% of the heating time, the second stage approximately 20 to 35% of the duration and the third stage approximately 70 to 35% of the duration.
  • This procedure first cleans the surface and those pores of the insulating part that are close to the surface of the insulating part at a low temperature of the solvent. All that is required is an ambient temperature of around 15 to 25 ° Celsius and the specified cleaning time.
  • the pores of the insulating part are cleaned, which are arranged deeper in the insulating part, in particular up to about 1/4 to 1/3 of the thickness of the insulating part.
  • the third stage of work covers the remaining, still deeper pores of the insulating part, so that at the end of the entire cleaning process the insulating part is free of PCB-containing insulating material or at most has a proportion of 100 ppm.
  • the PCB content of the solvent is preferably recorded continuously, and that the solvent be exchanged for PCB-free solvent if a predetermined limit value for PCB is exceeded.
  • the limit values for the PCB content are 5000 ppm in the first stage, 500 ppm in the second stage and 70 ppm in the third stage. This measure largely utilizes the absorption capacity of the solvent for PCBs without having to replace the solvent often.
  • the solvent circulate through the bath and at least one heat exchanger.
  • the solvent is below the liquid level by at least one Insert the nozzle into the bath and align the jet of liquid with the insulating part.
  • the insulating liquid that emerges from the pores is drained off very quickly, especially when the solvent is introduced into the bath at a rate of 0.5 to 1 m per second.
  • the insulating part is introduced into the bath together with the component to which the insulating part is attached.
  • the electrical coils, capacitor coils or the entire electrically active inner parts of the electrical devices together with the insulating parts which are present in these coils or capacitor parts are therefore introduced into the bath and subjected to cleaning.
  • the pores of the insulating parts cleaned of PCB-containing insulating liquid but also hair-fine gaps between the insulating parts and the adjacent coil or capacitor parts are freed from the PCB-containing insulating liquid.
  • the time-consuming removal of the insulating parts from the coils or capacitor parts is eliminated.
  • the system has a cube-shaped container 10 which is provided for the absorption of the solvent.
  • a plurality of ultrasound heads 12 are arranged on all vertical side walls of the container 10.
  • the flat bottom 14 of the container is provided with a multiplicity of ultrasound heads 16. Since the container 10 is shown in the central vertical section in FIG. 1, only the left side wall 18, the right side wall 20, the bottom 14 and the rear wall 22 can be seen. For the sake of clarity, the ultrasound heads arranged on the rear wall 22 are not shown.
  • Each of the ultrasound heads 12, 16 is connected to an ultrasound generator 24 by an electrical line 27. For the sake of clarity, only one of these lines 27 is shown in FIG. 1, although each of the ultrasound heads is connected to an ultrasound generator.
  • a lid 26 forms the upper end of the container 10.
  • a liquid space 28 is provided for the solvent, and an expansion space 30 arranged above it, which is free of solvent and whose height is approximately 10 to 20% of the height of the container 10.
  • the liquid space 28 forms the bath for the insulating parts.
  • a cage 32 is provided in the liquid space 28 and is composed of individual metal bars 34. The The distances between the metal rods are selected so that ultrasonic waves can penetrate the cage unhindered.
  • This cage 32 is provided for receiving the insulating parts that are to be cleaned.
  • the cage 32 is located approximately in the center of the liquid space 28 and has approximately the same distance from the lateral ultrasound heads 12 and from the lower ultrasound heads 16.
  • the cage 32 has at its open upper end a handle 36 which is connected to a vertically extending straight rod 38.
  • the rod 38 extends through an opening 39 of the cover 26 into the outer space 40. There the rod 38 is guided in a bearing block 42 in such a way that the rod can be easily moved in the vertical direction and at the same time a rotary movement is possible.
  • the bearing block 42 is fastened, for example, to a housing or building part 45, which is indicated.
  • the rod 38 is provided with teeth 43 into which the teeth of a gear 44 engage, the axis of rotation of the gear 44 running horizontally.
  • the gear 44 is provided with a drive, not shown. This drive alternately rotates gear 44 counterclockwise and clockwise, the rotational movement being approximately 1/4 to 1/2 of a full revolution. In other words, this means that the rod 38 and thus the cage 32 are continuously moved up and down by the reciprocating rotary movement of the gear 44.
  • the rotational movement of the gear 44 is selected so that the cage 32 performs an up and down movement at a speed of 0.02 to 0.5 meters per second, preferably 0.05 to 0.15 meters per second in the liquid space 28.
  • a further gear 46 is arranged on the rod 38.
  • the Rod in the hub of the gear 46 movable in the vertical direction, so that the position of the gear 46 remains unaffected when the rod 38 moves up and down.
  • the connection of the further gear 46 with the rod 38 is, however, designed such that rotational movements of the gear 46 are transmitted to the rod 38.
  • the rod 38 has a square cross section in the region of the further gear wheel 46, which cooperates with the correspondingly shaped cross section of the gear wheel hub.
  • the additional gear 46 is driven by a third gear 48 which is arranged on the shaft of an electric motor 50.
  • the speed of the electric motor 50 and the translation of the gears 46,48 is now selected so that the rod 38 and thus the cage 32 are set in rotation by the electric motor, the speed of rotation being selected such that the cage 32 is one on the periphery Peripheral speed of 0.02 to 0.5 meters per second, preferably 0.05 to 0.15 meters per second.
  • the ultrasound heads 12, 16 are arranged in the container 10 on the walls such that the ultrasound emitted by the ultrasound heads hits the cage 32.
  • Horizontally extending nozzles 52 are provided between the individual lateral ultrasound heads 12, and vertically extending nozzles 54 are arranged between the lower ultrasound heads 16.
  • the nozzles 52, 54 are inserted into the liquid space 28 from the outside and open there between the ultrasound heads. The outflow direction of the nozzles 52, 54 is aligned with the cage 32.
  • a pump 58, a dirt filter 64 and a heat exchanger 66 are switched on in the pipeline 62.
  • the heat exchanger 66 has a housing 68 in which a heating coil 70 and a cooling coil 72 are arranged, so that the solvent flowing through can optionally be heated or cooled.
  • a heating medium, preferably heating water is supplied to the heating coil 70 through the line 74 and discharged through the line 76.
  • a coolant, preferably cooling brine is fed through the line 78 to the cooling coil 72 and is removed through the line 80 after the heat has been absorbed. In many cases it is advisable to provide an electric heating coil.
  • the pipe 62 divides into the pipes 82 and 84.
  • the pipe 82 leads to the three nozzles 52 of the left side wall 18, the pipe 84 leads to the three nozzles 52 of the right side wall 20 of the container 10.
  • a pipeline 86 is also connected to the pipeline 82, which leads to the nozzles 52 of the left side wall 18, which leads to the three nozzles 54 of the base 14.
  • a pipeline 92 is connected to the pipeline 62, seen in the flow direction, in front of the pump 58, which leads via a pump 94 and a dirt filter 96 to a first storage tank 98.
  • the first storage container 98 is able to hold all of the solvent in the liquid space 28.
  • the first storage container 98 is connected by a pipeline 100 to a processing system 102, in which the PCB contained in the solvent and the insulating liquid are separated from the solvent and discharged through the line 104.
  • the PCB-containing insulating liquid discharged through line 104 is fed to a combustion.
  • the pipeline 140 For the removal of the PCB-free solvent from the processing system 102, the pipeline 140 is provided, which opens into a second storage tank 106.
  • the second storage container 106 is finally connected to the expansion space 30 of the container 10 by a pipe 108.
  • the volume of the second storage container 106 is at least equal to the volume of the liquid space 28.
  • An extraction line 110 leads from the pipeline 84 to an analysis device 112 for PCB.
  • a line 114 also leads back from the analysis device 112 to the line 84 and opens there downstream of the connection point of the extraction line 110.
  • the determined PCB values are entered through an electrical line 116 into an electrical control device 118 which controls the process flow.
  • An electrical input is connected to another input of the control device 118
  • Temperature sensor 120 connected by an electrical line 122.
  • the temperature sensor 120 is arranged between the pump 58 and the dirt filter 64 in the pipeline 62.
  • An electrically operated control and shut-off device 124 is arranged in the pipeline 108 and is connected via an electrical line 126 to an output of the control device 118.
  • an electrical control and shut-off device 128 is inserted into the pipeline 92 upstream of the pump 94 and connected to an output of the control device 118 by an electrical line 130.
  • An electrical control and shut-off device 132 and 134 is also arranged in each of the lines 74 and 78, and each is connected to an output of the control unit 118 by an electrical line 136 and 138, respectively.
  • the PCB-containing insulating liquid is removed from the electrical device, such as a transformer, choke or capacitor, which has been taken out of operation and is to be scrapped, and the device is rinsed with a solvent for PCB, so that the device is roughly cleaned. Then the electrical coils or capacitor parts are removed from the electrical device and, if necessary, the porous insulating parts are removed. For the pore-deep cleaning of these insulating parts, the cover 26 is removed from the container 10 and then the cage 32 is moved upwards with the aid of the gearwheel 44 so that the cage 32 is located above the liquid space 28. Then the parts that are to be freed from the PCB-containing insulating liquid are filled into the cage 32.
  • the electrical device such as a transformer, choke or capacitor
  • the liquid chamber 28 and the second storage container 106 are included the solvent for PCB filled, this solvent is at room temperature and is practically free of PCB.
  • the lid 26 is closed and the gears 44 and 48 are set in motion, so that the cage 23 reciprocates in the vertical direction and at the same time carries out a rotary movement.
  • the ultrasound generators 24 are now switched on, so that ultrasound waves emanate from the ultrasound heads 12, 16 connected to the ultrasound generator and act on the insulating parts and the solvent present in the cage 32.
  • the frequency of the ultrasound is preferably 20 to 30 kHz.
  • the total ultrasonic energy that is supplied to the ultrasonic heads by the ultrasonic generators is 20 to 80 watts per liter of solvent in the liquid chamber 28, preferably approximately 30 to 40 watts per liter. Since the pump 58 is in operation, solvent is drawn off from the lower region of the liquid space 28 through the pipelines 56, dirt particles are removed in the filter 84 and is led to the pipelines 82 and 84 through the heat exchanger 66, which is initially not heated or cooled, which direct the solvent to nozzles 52 and 54.
  • the solvent flows out of the nozzles into the liquid space 28 at a speed of 0.2 to 1 m per second and acts on the cage 32 and the insulating parts contained therein.
  • This operating state which takes place at the ambient temperature of the solvent, lasts approximately 3 minutes, and as a result of the movement of the cage 32 and the strong flow triggered by the nozzles 52, 54 in connection with the exposure to ultrasound, the surfaces and those pores of the insulating parts are cleaned that are near the surface.
  • a partial stream of the circulating solvent is removed from the pipeline 84 through the removal line 110 and the PCB content of the solvent is detected in the analyzer 112. After the measurement, the sample amount is returned through line 114 to pipeline 84. If the concentration of the solvent exceeds a value of 5000 ppm in the current operating state, this value is entered into the control device 118 through the electrical line 116. The control device 118 now opens the electrical control and shut-off device 128 with the help of the electrical line 130, which was previously closed. At the same time, an opening command is fed through the electrical line 126 to the previously closed control and shut-off device 124.
  • PCB-free solvent now flows from the second storage container 106 through the pipeline 108 into the liquid space 28, while at the same time PCB-containing solvent is removed through the pipelines 56 and 92 from the solvent circuit.
  • This PCB-containing solvent is passed through the pump 94 and a dirt filter 96 into the first storage container 98. From here, the PCB-containing solvent is fed through the pipeline 100 to the processing system 102.
  • the PCB and the insulating liquid absorbed by the solvent are separated from the solvent and discharged through the line 104, while the PCB-free solvent is transported through the pipeline 140 into the second storage container 106.
  • the limit of 5000 ppm PCB in the solvent is at least 30% lower, this is detected by the measuring device 112 and the control device 118 causes the control and shut-off devices 124 and 128 to close, so that no more solvent is exchanged.
  • the entire solvent is preferably replaced.
  • the control unit 118 switches to the second work stage, which is the same as the first work stage with regard to the movement of the cage 32 and with respect to the solvent circuit.
  • the control device 118 opens the electrically operated control and shut-off device 132 of the line 74, so that the heating coil 70 is acted upon by the heating medium.
  • the heating medium preferably heating water
  • the solvent in the heat exchanger 66 is heated to a temperature value that lies between the ambient temperature and the end temperature. A value is considered as the final temperature, which is preferably 10 to 20 ° Celsius below the boiling point of the solvent.
  • the temperature of the solvent is detected by the temperature sensor 120 and the measurement signal is passed on to the control unit 118 through the electrical line 122.
  • This control device now adjusts the flow of the heating medium with the aid of the control and shut-off device 132 in such a way that the desired solvent temperature is maintained.
  • the limit value of the PCB content of the solvent in the second stage is approximately 500 ppm. If the solvent exceeds this content, as in the first stage of operation, PCB-free solvent is led from the second storage container 106 into the liquid space 28 and at the same time PCB-containing solvent is withdrawn from the solvent circuit and introduced into the first storage container 98. In the second stage of operation, the insulating parts in the cage 32 are freed of PCB-containing insulating liquid to medium depths.
  • the control unit 118 switches to the third stage.
  • the system operates as in stages 1 or 2, but the difference compared to the previous stages is that the third stage lasts approximately 21 minutes and the solvent is heated to a final temperature which is approximately 5 ° C below the boiling temperature.
  • a value of 70 ppm now serves as the limit for the PCB content of the solvent. If this value is exceeded, this is detected by the measuring device 112 and the solvent in the liquid space 28 is exchanged automatically, as in the first working step described further above.
  • the gradual heating of the solvent and the gradual reduction of the maximum permissible limit for the PCB content of the solvent in connection with the exposure to ultrasonic waves and the solvent flow in the liquid space 28 and the movement of the insulating parts with the aid of the cage 32 will remove the PCB Insulating agent obtained from all pores of the insulating parts.
  • the insulating parts are therefore considered to be PCB-free and can be used as required, e.g. as fuel for furnaces.
  • the exposure to ultrasonic waves in the specified frequency range increases the cleaning action of the solvent, so that the PCB-containing insulating liquid is also removed from all pores and from all hair-fine gaps.
  • the cleaning effect is supported by the gradual heating of the solvent and the exchange of the solvent when a maximum value is reached.
  • the movement of the insulating parts in the solvent with the aid of the cage has the result that blind spots are avoided and all areas are hit by the ultrasonic waves.
  • the vigorous flow around the insulating parts with the aid of the nozzles means that the PCB-containing insulating liquid which has been released from the pores is quickly removed from the insulating part.
  • the end of the cleaning process is when the PCB content no longer rises above 70 ppm.
  • the solvent in the liquid space 28 is under ambient pressure.
  • the expansion space 30 is connected to the outer space 40 at the point at which the rod 38 is guided through the cover 26.
  • the solvent is heated to a final temperature which is approximately 10 to 25 ° C below the boiling point. If the boiling point of the solvent is below 90 ° Celsius, then as Final temperature used for heating the solvent is a value which is about 5 to 10 ° Celsius below the boiling temperature.
  • the solvent mentioned under number 4 was used.
  • the solvent temperature was approximately 20 ° Cesius, in the second stage approximately 32 ° Cesius and in the third stage approximately 43 ° Celsius. It is often advisable to extend the cleaning process or the duration of a work step to 60 minutes. This is particularly necessary when insulating parts that are thicker than 1 cm are to be cleaned deep down.
  • the gears 44 and 48 can simultaneously impart a lifting and rotating movement to the cage 32. However, it is also possible to drive only one of the gears 44, 48 so that the cage only carries out a lifting or rotating movement.
  • the ultrasound heads 12, 16 arranged next to the nozzles each have a circular outline.
  • the insulating parts are separated from the electrical coils or capacitor components, then introduced into the cage 32 and subjected to cleaning. In many cases, however, it is easier not to remove the insulating parts from the electrical coils or capacitor parts to bring the coils and capacitor parts together with the insulating parts into the liquid space 28 of the container 10 and to clean them overall.
  • An electrical coil 142 is shown in detail in FIG. Such coils are used in electrical transformers and electrical chokes and are exposed to the liquid, PCB-containing insulating liquid, which is accommodated together with the coils in a transformer housing or choke housing.
  • the electrical coil 142 has a plurality of indicated turns 144, e.g. made of copper wire. Insulating parts, such as insulating paper, hard paper, hard tissue, which are not shown in FIG. 2, are inserted between the turns 144, in addition, the electrical connecting conductors 146 of the coil are wrapped with insulating paper 148.
  • insulating parts in the form of rings, beams or rollers made of insulating wood are provided at the top and bottom of the turns 144, with the aid of which the turns 144 are pressed.
  • bars 150 are provided which press the coil 142 together by at least two threaded rods 153 with nuts 155.
  • the connecting conductors 146 are guided through openings in the beams 150 to the outside.
  • the electrical coil 142 together with the parts 148, 150 into the liquid space 28 of the container 10 Cleaning introduced.
  • the electrical coil 142 or the threaded rods 153 is attached to an axial upper end A holder 151 fastens a rod 238, which is identical to the rod 38 of FIG. 1.
  • the rod 238 extends in the axial direction of the coil, as can be clearly seen from FIG. 2. 1, the cage 32 and the rod 38 are removed and instead the electrical coil 142 of FIG. 2 provided with the rod 238 is introduced into the liquid space 28.
  • the rod 238, just like the rod 38 in the exemplary embodiment according to FIG. 1, is driven by the gear wheels 44 and 46.
  • the cleaning process now proceeds as described in connection with FIG. 1.
  • the great advantage here is that in addition to cleaning the pores of the insulating parts, a cleaning of hair-fine gaps is also achieved, which are present between individual turns of the coil or between the insulating parts 146, 150 and the turns 144 or the connecting conductors 146.
  • the active part of the capacitor is shown as a detail.
  • the active part comprises at least one or more thin capacitor bundles wound into a roll pack 152, between which insulating paper (not shown) is inserted.
  • FIG. 4 The roller package 152 has axially extending electrical connecting conductors 154, which are partially surrounded and insulated with insulating paper 156.
  • bandages 158 are provided.
  • FIG. 4 which shows a view of the capacitor roller set from the direction IV of FIG. 3, it can be seen that the roller set has an approximately elliptical cross section.
  • the individual layers of the rolled-up capacitor strips 160 are also indicated with inserted insulating paper.
  • FIG. 5 shows a detail from FIG. 4 in a very large magnification.
  • the roller packet 152 In order to be able to clean the PCB-containing insulating liquid 156, 164 in the assembled state from the PCB-containing insulating liquid, the roller packet 152, like the electrical coil 142 of FIG. 2, is provided with an axially extending rod 338, which is designed in the same way as 1.
  • the rod 38 according to FIG. 1. The rod 38 is then removed in the system according to FIG. 1 and the capacitor roller package 152 together with the rod 338 is introduced into the container 10, it being possible advantageously for several roller packages to be introduced at the same time. Thereafter, the gears 44 and 46 take over the movement and the drive of the rod 338, so that the roller set 152 is moved in the liquid space 28.
  • the transformers, chokes and capacitors which are mentioned in the present invention are devices which are used in electrical power generation systems and power distribution systems.
  • the cooling coil 72 or the cooling coil 88 arranged in the heat exchanger 66 in FIG. 1 is then put into operation when the temperature of the solvent should rise above the respectively provided working temperature. Such an increase in temperature can be triggered by the ultrasound energy supplied to the ultrasound heads.
  • the cooling coil serves to cool the solvent to ambient temperature after the cleaning process has ended.

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  • Chemical & Material Sciences (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Cleaning By Liquid Or Steam (AREA)
  • Cleaning And De-Greasing Of Metallic Materials By Chemical Methods (AREA)
EP87117444A 1986-11-29 1987-11-26 Procédé de nettoyage pour un élément isolant Expired - Lifetime EP0270928B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3640949 1986-11-29
DE3640949 1986-11-29

Publications (3)

Publication Number Publication Date
EP0270928A2 true EP0270928A2 (fr) 1988-06-15
EP0270928A3 EP0270928A3 (en) 1989-09-06
EP0270928B1 EP0270928B1 (fr) 1992-01-15

Family

ID=6315171

Family Applications (1)

Application Number Title Priority Date Filing Date
EP87117444A Expired - Lifetime EP0270928B1 (fr) 1986-11-29 1987-11-26 Procédé de nettoyage pour un élément isolant

Country Status (3)

Country Link
US (1) US4826538A (fr)
EP (1) EP0270928B1 (fr)
DE (2) DE3740067A1 (fr)

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EP0387886A2 (fr) * 1989-03-16 1990-09-19 Dürr GmbH Procédé de nettoyage des articles
AU621027B3 (en) * 1989-02-14 1992-01-15 High Tech Auto Tools Pty Ltd A method of cleaning an electronic fuel injector
AU621447B2 (en) * 1989-02-14 1992-03-12 High-Tech Auto Tools Pty Limited An electronic fuel injector cleaner apparatus and method
EP0620052A1 (fr) * 1993-04-16 1994-10-19 Martin Marietta Corporation Système de nettoyage à agitation contrôlée
AU657539B2 (en) * 1989-02-14 1995-03-16 High Tech Auto Tools Pty Ltd An electronic fuel injector cleaner apparatus and method
EP2228144A1 (fr) * 2009-03-10 2010-09-15 BANDELIN electronic GmbH & Co. KG Dispositif supplémentaire pour appareils de nettoyage à ultrasons

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US4983222A (en) * 1988-04-14 1991-01-08 Union Carbide Chemicals And Plastics Company Inc. Vapor solvent decontamination of PCB transformer components
JP2832443B2 (ja) * 1988-11-22 1998-12-09 本多電子株式会社 マルチ周波数超音波洗浄方法及び洗浄装置
CA2021352C (fr) * 1989-08-08 1994-03-22 Lothar Stein Dispositif de nettoyage pour pieces coulees de precision
JP3336323B2 (ja) * 1993-10-28 2002-10-21 本多電子株式会社 超音波洗浄方法及びその装置
US5762084A (en) * 1994-07-15 1998-06-09 Ontrak Systems, Inc. Megasonic bath
DE4427748C1 (de) * 1994-08-05 1996-02-29 Peter Rusbuelt Verfahren und Vorrichtung zum Reinigen von Transformatoren
US5996596A (en) * 1997-11-19 1999-12-07 Coburn Optical Industries, Inc. Method and apparatus for cleaning ophthalmic lenses and blocks
US6401731B2 (en) 1999-01-19 2002-06-11 William Robertson Method of decontaminating PCB transformers
US6536450B1 (en) 1999-07-07 2003-03-25 Semitool, Inc. Fluid heating system for processing semiconductor materials
WO2001002108A1 (fr) 1999-07-06 2001-01-11 Semitool, Inc. Systeme de chauffage de fluides pour le traitement de materiaux semiconducteurs
US6423151B1 (en) 2000-02-29 2002-07-23 Kinectrics Inc. Removal of toxic contaminants from porous material
US8978673B2 (en) * 2007-08-09 2015-03-17 Asm Assembly Automation Ltd Megasonic cleaning system
CN104438204A (zh) * 2014-12-07 2015-03-25 重庆三好纸业有限公司 带有锥形转子的木片清洗装置
US10875059B2 (en) 2017-11-21 2020-12-29 Automatic Spring Products Corp. Method and apparatus for automated particulate extraction from solid parts
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US3702795A (en) * 1968-02-21 1972-11-14 Grace W R & Co Apparatus for ultrasonic etching of polymeric printing plates
US4409999A (en) * 1981-08-07 1983-10-18 Pedziwiatr Edward A Automatic ultrasonic cleaning apparatus
EP0098811A1 (fr) * 1982-07-02 1984-01-18 S.R.L. Sirea Procédé pour désinfecter les dispositifs électro-mécaniques de polychlorobiphényl
EP0188698A2 (fr) * 1984-11-27 1986-07-30 Union Carbide Corporation Procédé de remplacement d'un agent réfrigérant contenant du PCB dans un appareil électrique d'induction par un agent réfrigérant essentiellement libre de PCB

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AU621027B3 (en) * 1989-02-14 1992-01-15 High Tech Auto Tools Pty Ltd A method of cleaning an electronic fuel injector
AU621447B2 (en) * 1989-02-14 1992-03-12 High-Tech Auto Tools Pty Limited An electronic fuel injector cleaner apparatus and method
AU657539B2 (en) * 1989-02-14 1995-03-16 High Tech Auto Tools Pty Ltd An electronic fuel injector cleaner apparatus and method
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Also Published As

Publication number Publication date
DE3740067C2 (fr) 1993-08-12
DE3740067A1 (de) 1988-07-28
DE3776107D1 (de) 1992-02-27
EP0270928B1 (fr) 1992-01-15
EP0270928A3 (en) 1989-09-06
US4826538A (en) 1989-05-02

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