WO2004020071A1 - Method for cleaning a filter - Google Patents

Method for cleaning a filter Download PDF

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Publication number
WO2004020071A1
WO2004020071A1 PCT/EP2003/004318 EP0304318W WO2004020071A1 WO 2004020071 A1 WO2004020071 A1 WO 2004020071A1 EP 0304318 W EP0304318 W EP 0304318W WO 2004020071 A1 WO2004020071 A1 WO 2004020071A1
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WO
WIPO (PCT)
Prior art keywords
filter
cleaning
cleaning device
liquid
dirt
Prior art date
Application number
PCT/EP2003/004318
Other languages
German (de)
French (fr)
Inventor
Thomas Piller
Original Assignee
Piller Entgrattechnik 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 Piller Entgrattechnik Gmbh filed Critical Piller Entgrattechnik Gmbh
Publication of WO2004020071A1 publication Critical patent/WO2004020071A1/en

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D29/00—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor
    • B01D29/11—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor with bag, cage, hose, tube, sleeve or like filtering elements
    • B01D29/114—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor with bag, cage, hose, tube, sleeve or like filtering elements arranged for inward flow filtration
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D29/00—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor
    • B01D29/62—Regenerating the filter material in the filter
    • B01D29/64—Regenerating the filter material in the filter by scrapers, brushes, nozzles, or the like, acting on the cake side of the filtering element
    • B01D29/6438—Regenerating the filter material in the filter by scrapers, brushes, nozzles, or the like, acting on the cake side of the filtering element nozzles
    • B01D29/6446—Regenerating the filter material in the filter by scrapers, brushes, nozzles, or the like, acting on the cake side of the filtering element nozzles with a rotary movement with respect to the filtering element
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D29/00—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor
    • B01D29/62—Regenerating the filter material in the filter
    • B01D29/66—Regenerating the filter material in the filter by flushing, e.g. counter-current air-bumps
    • B01D29/68—Regenerating the filter material in the filter by flushing, e.g. counter-current air-bumps with backwash arms, shoes or nozzles
    • B01D29/682—Regenerating the filter material in the filter by flushing, e.g. counter-current air-bumps with backwash arms, shoes or nozzles with a rotary movement with respect to the filtering element
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D29/00—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor
    • B01D29/62—Regenerating the filter material in the filter
    • B01D29/66—Regenerating the filter material in the filter by flushing, e.g. counter-current air-bumps
    • B01D29/68—Regenerating the filter material in the filter by flushing, e.g. counter-current air-bumps with backwash arms, shoes or nozzles
    • B01D29/684—Regenerating the filter material in the filter by flushing, e.g. counter-current air-bumps with backwash arms, shoes or nozzles with a translatory movement with respect to the filtering element
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D29/00—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor
    • B01D29/62—Regenerating the filter material in the filter
    • B01D29/66—Regenerating the filter material in the filter by flushing, e.g. counter-current air-bumps
    • B01D29/68—Regenerating the filter material in the filter by flushing, e.g. counter-current air-bumps with backwash arms, shoes or nozzles
    • B01D29/686—Regenerating the filter material in the filter by flushing, e.g. counter-current air-bumps with backwash arms, shoes or nozzles with a combination of movements with respect to the filtering elements
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2201/00—Details relating to filtering apparatus
    • B01D2201/58—Power supply means for regenerating the filter
    • B01D2201/583—Power supply means for regenerating the filter using the kinetic energy of the fluid circulating in the filtering device

Definitions

  • the invention relates to a method for cleaning a filter through which a contaminated liquid flows, by means of a cleaning liquid used in the countercurrent direction to remove the dirt deposited on the outside of the filter.
  • Bag and tube filters are used for filtering contaminated liquids. There are many applications in industry, with pore size and retention capacity playing a particularly important role. The selection of the filter type is essentially based on these criteria. If the retention capacity is too small, a cheap bag filter is often used, which can easily be replaced after a short or long time.
  • a backwashing method is known from DE 195 23 463 A1, in which a portion of the filtered liquid from the interior of the tubular filter, which is under a low pressure, is again passed through a changing portion of the filter to the outside and takes on the atmospheric pressure. This can be done by moving an axial channel around the filter that is under atmospheric pressure. The part of the returned filtered liquid pushes off the dirt adhering to the outside of the filter, which collects and is discharged in the lower area of the channel.
  • This backwash process can also be used with a fixed channel and a rotating filter.
  • This known backwashing method is limited in the application if it is a thick-walled tubular filter with a very small pore size and thus a large retention capacity. In such extreme conditions, it is usually unavoidable to replace the filter.
  • a cleaning device is axially adjusted in the interior of the sleeve-shaped filter through which the outside flows and which acts on the wall of the interior of the filter with high-pressure jets of a cleaning liquid and presses through the filter the dirt adhering to the outside thereof ,
  • the pressure of the high-pressure jets can be chosen so high that it can still exert a sufficient push-off force on the dirt adhering through the filter on the outside of the filter. Since this detachment is limited to a small filter area, the cleaning can also take place simultaneously with the filtering.
  • the area in the interior of the filter is determined by the movement of the cleaning device in the axial direction and in the circumferential direction.
  • the area to which the pressure is applied can also be achieved by simultaneously rotating the cleaning device with two diametrically arranged nozzles during the axial adjustment, or by only axially adjusting the cleaning device with two diametrically arranged nozzles, and that during the axial adjustment of the cleaning device Filter is rotated.
  • the number of nozzles on the cleaning device can also be smaller or larger. This depends on the size of the filter and the structure and the adjustment of the cleaning device and / or the filter.
  • the detachment of the dirt on the outside of the filter can be improved according to a further development in that with the axial adjustment of the cleaning device on the outside of the filter a washing device is axially adjusted, with which the outside of the filter is washed off the dirt by means of a washing jet. In this case, the detached dirt can additionally be forced downwards, ie in the direction of collection.
  • washing jet does not weaken the effect of the high-pressure jets too much, it can further be provided that a washing jet is selected which is weaker than the high-pressure jets of the cleaning liquid of the cleaning device or acts on the area offset from the high-pressure jets.
  • the filter is cleaned when the liquid to be cleaned is interrupted or switched off.
  • the operating mode can be adapted more easily to different difficult conditions.
  • an embodiment is advantageous which is characterized in that the pressure of the cleaning liquid and the washing liquid is made adjustable for the high-pressure jets and the washing jet. If a tubular filter is used which has a small pore size and a large retention capacity, the method according to the invention has proven particularly useful.
  • Fig. 1 shows schematically the cleaning of a stationary filter by means of an axially adjustable and rotating cleaning device
  • Fig. 2 schematically shows the cleaning of a rotary filter by means of its adjustable cleaning device in the interior.
  • a thick-walled tubular filter 10 is used, to which the liquid to be cleaned is fed on the outside and is filtered and discharged downward from the interior 11.
  • the liquid has a pressure that is sufficient to pass through the tubular filter 10.
  • the dirt is primarily deposited on the outside of the tubular filter 10. Small dirt particles also penetrate into the porous filter body, the pore size of which determines the size of the dirt particles to be filtered out. The degree of contamination of the liquid to be cleaned can be so great that the filter body clogs up and loses its filter properties. Care is therefore taken to ensure that this blockage not taking place. Therefore, the tube filter 10 is assigned an automatically operating cleaning device 20, which is fed with a high-pressure cleaning liquid 27.
  • This cleaning device 20 has two diametrically arranged nozzles 21 and 22 and, as the double arrow 30 shows, is axially adjusted in the interior 11 of the return filter 10 and is thereby set in rotation, as shown by the arrow 31.
  • the nozzles 21 and 22 direct high-pressure jets 23 and 25 onto the winding of the interior 11 of the tubular filter 10, so that this is fully acted upon both during the downward and upward movement of the cleaning device 20.
  • the high-pressure jets 23 and 24 have so much power that they are still sufficiently strong through the tubular filter 10 to push off adhering dirt from the outside of the tubular filter 10, even if the liquid to be cleaned is still there.
  • the cleaning device 20 can be continuously adjusted and rotated or the movement processes can also be repeated periodically. However, the high-pressure cleaning device can only be put into operation when the filtering is switched off. This depends on the given operating conditions of the filtering.
  • a washing device 25 can be axially adjusted and rotated, which acts on the outside of the tubular filter 10 with a washing jet 26, which at the same time also gives up a moving component downward to the loosened dirt ,
  • the dirt is collected in the lower area of the tubular filter 10 and removed.
  • the exemplary embodiment according to FIG. 2 has the same effect and can have the same variants between filtering and cleaning as the exemplary embodiment according to FIG. 1.
  • the only difference is that the cleaning device 20 and the washing device 25 only perform an axial downward and upward movement 30. To do this, however, the tubular filter 10 must perform its own rotary movement 40 so that the entire outside of the tubular filter 10 can be washed off the dirt by the washing device 25.

Abstract

The invention relates to a method for cleaning a filter through which dirty liquid flows. The filter is cleaned by means of a cleaning fluid which passes in the opposite direction to the flow in order to remove the dirt deposited on the outer side of the filter. According to the invention, a cleaning device is displaced in the interior of the cone-shaped filter which is externally cross-flown. Said cleaning device comprises high pressure jets of a cleaning fluid which impinge upon the walls of the inner chamber of the filter and press the adhesive dirt through the filter to the outside thereof. A tube filter having small pores and strong retaining capacity can also be freed from continuously accumulating dirt during filtering.

Description

Verfahren zum Reinigen eines FiltersProcess for cleaning a filter
Die Erfindung betrifft ein Verfahren zum Reinigen eines Filters, das von einer verschmutzten Flüssigkeit durchströmt wird, mittels einer in Gegenstromrichtung verwendeten Reinigungsflüssigkeit zum Entfernen des auf der Außenseite des Filters abgelagerten Schmutz.The invention relates to a method for cleaning a filter through which a contaminated liquid flows, by means of a cleaning liquid used in the countercurrent direction to remove the dirt deposited on the outside of the filter.
Zum Einsatz für die Filterung von schmutzbeladenen Flüssigkeiten kommen Beutel- und Rohrfilter. Dabei gibt es in der Industrie viele Anwendungsfälle, wobei insbesondere die Porengröße und die Rückhaltekapazität eine entscheidende Rolle spielen. Die Auswahl der Filterart richtet sich im Wesentlichen nach diesen Kriterien. Dabei wird bei zu kleiner Rückhaltekapazität oft ein billiges Beutelfilter verwendet, das nach einer kurzen oder längeren Zeit einfach ausgetauscht wird.Bag and tube filters are used for filtering contaminated liquids. There are many applications in industry, with pore size and retention capacity playing a particularly important role. The selection of the filter type is essentially based on these criteria. If the retention capacity is too small, a cheap bag filter is often used, which can easily be replaced after a short or long time.
In vielen Fällen, insbesondere bei großer Menge anfallender und stark verschmutzter Flüssigkeit, ist diese Methode nicht brauchbar, da viele Rüstzeiten anfallen und der Verbrauch an Filtern einen erheblichen Kostenaufwand bedingt. Dies umso mehr, desto kleiner die Porengröße und damit der auszufilternde Schmutz und die anfallende Menge ist.In many cases, especially with a large amount of accumulated and very dirty liquid, this method cannot be used because of the long set-up times incurred and the consumption of filters requires a considerable cost. All the more, the smaller the pore size and thus the dirt to be filtered out and the amount produced.
Daher hat es nicht an Versuchen gefehlt, das Filter ohne auszuwechseln im eingebauten Zustand zu reinigen und vom ausgefilterten Schmutz zu befreien. Als geeignet hat sich dabei das sogenannte Rückspülen des Filters erwiesen, das insbesondere bei Rohrfiltern eingesetzt wird. So ist aus der DE 195 23 463 A1 ein Rück- spül-Verfahren bekannt, bei dem ein Teil der gefilterten Flüssigkeit aus dem Innenraum des Rohrfilters, die unter einem geringen Druck steht, wieder durch einen sich ändernden Teilbereich des Filters nach außen geleitet wird und dabei den atmosphärischen Druck annimmt. Dazu kann ein axialer Kanal um das Filter bewegt werden, der unter atmosphärischem Druck steht. Der Teil der rückgeführten gefilterten Flüssigkeit drückt den auf der Außenseite des Filters haftenden Schmutz ab, der sich im unteren Bereich des Kanals sammelt und abgeführt wird. Dieses Rückspülverfahren kann auch bei feststehendem Kanal und sich drehendem Filter angewendet werden.There has therefore been no shortage of attempts to clean the filter in the installed state without replacing it and to remove the filtered dirt. So-called backwashing of the filter, which is used in particular with tubular filters, has proven to be suitable. A backwashing method is known from DE 195 23 463 A1, in which a portion of the filtered liquid from the interior of the tubular filter, which is under a low pressure, is again passed through a changing portion of the filter to the outside and takes on the atmospheric pressure. This can be done by moving an axial channel around the filter that is under atmospheric pressure. The part of the returned filtered liquid pushes off the dirt adhering to the outside of the filter, which collects and is discharged in the lower area of the channel. This backwash process can also be used with a fixed channel and a rotating filter.
Dieses bekannte Rückspülverfahren ist im Anwendungsfall dann begrenzt, wenn es sich um dickwandige Rohrfilter mit sehr kleiner Porengröße und damit großer Rückhaltekapazität handelt. Bei derart extremen vorliegenden Bedingungen lässt sich meist ein Filteraustausch nicht vermeiden.This known backwashing method is limited in the application if it is a thick-walled tubular filter with a very small pore size and thus a large retention capacity. In such extreme conditions, it is usually unavoidable to replace the filter.
Es ist Aufgabe der Erfindung, ein Verfahren der eingangs erwähnten Art zu schaffen, das auch bei extremen Gegebenheiten von kleiner Porengröße und großer Rückhaltekapazität bei dickwandigen Rohrfiltern für eine automatisch ablaufende Reinigung eingesetzt werden kann.It is an object of the invention to provide a method of the type mentioned at the outset which is also of extreme size of small pore size and large Retention capacity can be used with thick-walled tube filters for automatic cleaning.
Diese Aufgabe wird nach der Erfindung dadurch gelöst, dass im Innenraum des hülsenförmigen, von außen durchströmten Filters axial eine Reinigungsvorrichtung verstellt wird, die mit Hochdruckstrahlen einer Reinigungsflüssigkeit die Wandung des Innenraumes des Filters beaufschlagt und durch das Filter hindurch den auf der Außenseite desselben haftenden Schmutz abdrückt.This object is achieved according to the invention in that a cleaning device is axially adjusted in the interior of the sleeve-shaped filter through which the outside flows and which acts on the wall of the interior of the filter with high-pressure jets of a cleaning liquid and presses through the filter the dirt adhering to the outside thereof ,
Der Druck der Hochdruckstrahlen kann dabei so groß gewählt werden, dass dieser durch das Filter hindurch auf der Außenseite desselben noch eine ausreichende Abdrückkraft auf den dort haftenden Schmutz ausüben kann. Da diese Ablösung nur auf einen kleinen Filterbereich beschränkt ist, kann die Reinigung auch gleichzeitig mit der Filterung ablaufen. Dabei wird die beaufschlagte Fläche im Innenraum des Filters durch die Bewegung der Reinigungsvorrichtung in axialer Richtung und in Umfangsrichtung festgelegt ist. Die Festlegung der beaufschlagten Fläche kann auch dadurch erreicht werden, dass die Reinigungsvorrichtung mit zwei diametral angeordneten Düsen bei der axialen Verstellung gleichzeitig in Drehbewegung versetzt wird oder dass die Reinigungsvorrichtung mit zwei diametral angeordneten Düsen nur axial verstellt wird und dass bei der axialen Verstellung der Reinigungsvorrichtung das Filter in Drehbewegung versetzt wird.The pressure of the high-pressure jets can be chosen so high that it can still exert a sufficient push-off force on the dirt adhering through the filter on the outside of the filter. Since this detachment is limited to a small filter area, the cleaning can also take place simultaneously with the filtering. The area in the interior of the filter is determined by the movement of the cleaning device in the axial direction and in the circumferential direction. The area to which the pressure is applied can also be achieved by simultaneously rotating the cleaning device with two diametrically arranged nozzles during the axial adjustment, or by only axially adjusting the cleaning device with two diametrically arranged nozzles, and that during the axial adjustment of the cleaning device Filter is rotated.
Die Anzahl der Düsen an der Reinigungsvorrichtung kann jedoch auch kleiner oder größer sein. Dies richtet sich nach der Größe des Filters und dem Aufbau sowie der Verstellung der Reinigungsvorrichtung und/oder des Filters. Die Ablösung des Schmutzes auf der Außenseite des Filters kann nach einer Weiterbildung dadurch verbessert werden, dass mit der axialen Verstellung der Reinigungsvorrichtung auf der Außenseite des Filters eine Waschvorrichtung axial verstellt wird, mit der mittels eines Waschstrahles die Außenseite des Filters vom Schmutz abgewaschen wird. Dabei kann dem abgelösten Schmutz zusätzlich eine Bewegungskomponente nach unten, d.h. in Auffangrichtung, aufgezwungen werden.However, the number of nozzles on the cleaning device can also be smaller or larger. This depends on the size of the filter and the structure and the adjustment of the cleaning device and / or the filter. The detachment of the dirt on the outside of the filter can be improved according to a further development in that with the axial adjustment of the cleaning device on the outside of the filter a washing device is axially adjusted, with which the outside of the filter is washed off the dirt by means of a washing jet. In this case, the detached dirt can additionally be forced downwards, ie in the direction of collection.
Damit der Waschstrahl die Wirkung der Hochdruckstrahlen nicht zu sehr schwächt, kann weiterhin vorgesehen sein, dass ein Waschstrahl gewählt wird, der schwächer ist als die Hochdruckstrahlen der Reinigungsflüssigkeit der Reinigungsvorrichtung oder gegenüber den Hochdruckstrahlen versetzte Bereich beaufschlagt.So that the washing jet does not weaken the effect of the high-pressure jets too much, it can further be provided that a washing jet is selected which is weaker than the high-pressure jets of the cleaning liquid of the cleaning device or acts on the area offset from the high-pressure jets.
Nach einer weiteren Ausgestaltung ist vorgesehen, dass die Reinigung des Filters bei unterbrochener oder abgeschalteter, zu reinigender Flüssigkeit vorgenommen wird. Die Betriebsweise kann dabei an unterschiedlich schwierige Bedingungen leichter angepasst werden.According to a further embodiment, it is provided that the filter is cleaned when the liquid to be cleaned is interrupted or switched off. The operating mode can be adapted more easily to different difficult conditions.
In manchen Anwendungsfällen hat es sich als ausreichend erwiesen, wenn das Verfahren so abläuft, dass die Reinigung des Filters während der Filtrierung der zu reinigenden Flüssigkeit in Zeitabständen kurzzeitig vorgenommen wird.In some applications, it has proven to be sufficient if the process is carried out in such a way that the filter is cleaned briefly at intervals during the filtration of the liquid to be cleaned.
Von Vorteil ist in jedem Falle eine Ausgestaltung, die dadurch gekennzeichnet ist, dass der Druck der Reinigungsflüssigkeit und der Waschflüssigkeit für die Hochdruckstrahlen und den Waschstrahl einstellbar gemacht wird. Wird ein Rohrfilter verwendet, das kleine Porengröße und große Rückhaltekapazität aufweist, dann bewährt sich das Verfahren nach der Erfindung besonders gut.In any case, an embodiment is advantageous which is characterized in that the pressure of the cleaning liquid and the washing liquid is made adjustable for the high-pressure jets and the washing jet. If a tubular filter is used which has a small pore size and a large retention capacity, the method according to the invention has proven particularly useful.
Die Erfindung wird anhand von zwei in der Zeichnung dargestellten Ausführungsbeispielen näher erläutert. Es zeigen:The invention is explained in more detail with reference to two exemplary embodiments shown in the drawing. Show it:
Fig. 1 schematisch die Reinigung eines feststehenden Filters mittels einer axial verstellbaren und in Drehbewegung versetzten Reinigungsvorrichtung undFig. 1 shows schematically the cleaning of a stationary filter by means of an axially adjustable and rotating cleaning device and
Fig. 2 schematisch die Reinigung eines in Drehbewegung versetzten Filters mittels seiner im Innenraum desselben verstellbaren Reinigungsvorrichtung.Fig. 2 schematically shows the cleaning of a rotary filter by means of its adjustable cleaning device in the interior.
In den Ausführungsbeispielen wird ein dickwandiges Rohrfilter 10 verwendet, dem die zu reinigende Flüssigkeit auf der Außenseite zugeführt und gefiltert aus dem Innenraum 11 nach unten abgeführt wird. Dabei weist die Flüssigkeit einen Druck auf, der ausreicht, um das Rohrfilter 10 zu passieren. Dabei wird der Schmutz in erster Linie auf der Außenseite des Rohrfilters 10 abgelagert. Kleine Schmutzteile dringen auch in den porösen Filterkörper ein, dessen Porengröße die Größe der auszufilternden Schmutzteile bestimmt. Der Verschmutzungsgrad der zu reinigenden Flüssigkeit kann so groß sein, dass der Filterkörper sich zusetzt und seine Filtereigenschaft verliert. Es wird daher dafür Sorge getragen, dass diese Blockade nicht stattfindet. Daher wird dem Rohrfilter 10 eine automatisch arbeitende Reinigungsvorrichtung 20 zugeordnet, die mit einer Hochdruck-Reinigungsflüssigkeit 27 gespeist wird. Diese Reinigungsvorrichtung 20 weist zwei diametral angeordnete Düsen 21 und 22 auf und wird, wie der Doppelpfeil 30 zeigt, axial im Innenraum 1 1 des Rückfilters 10 verstellt und dabei in Drehbewegung versetzt, wie mit dem Pfeil 31 gezeigt wird. Die Düsen 21 und 22 richten Hochdruckstrahlen 23 und 25 auf die Windung des Innenraumes 1 1 des Rohrfilters 10, so dass diese sowohl bei der Abwärts- als auch bei der Aufwärtsbewegung der Reinigungsvorrichtung 20 vollständig beaufschlagt wird. Die Hochdruckstrahlen 23 und 24 besitzen soviel Kraft, dass sie durch das Rohrfilter 10 hindurch noch genügend stark sind, anhaftenden Schmutz von der Außenseite des Rohrfilters 10 abzudrücken, selbst wenn dort die zu reinigende Flüssigkeit noch ansteht.In the exemplary embodiments, a thick-walled tubular filter 10 is used, to which the liquid to be cleaned is fed on the outside and is filtered and discharged downward from the interior 11. The liquid has a pressure that is sufficient to pass through the tubular filter 10. The dirt is primarily deposited on the outside of the tubular filter 10. Small dirt particles also penetrate into the porous filter body, the pore size of which determines the size of the dirt particles to be filtered out. The degree of contamination of the liquid to be cleaned can be so great that the filter body clogs up and loses its filter properties. Care is therefore taken to ensure that this blockage not taking place. Therefore, the tube filter 10 is assigned an automatically operating cleaning device 20, which is fed with a high-pressure cleaning liquid 27. This cleaning device 20 has two diametrically arranged nozzles 21 and 22 and, as the double arrow 30 shows, is axially adjusted in the interior 11 of the return filter 10 and is thereby set in rotation, as shown by the arrow 31. The nozzles 21 and 22 direct high-pressure jets 23 and 25 onto the winding of the interior 11 of the tubular filter 10, so that this is fully acted upon both during the downward and upward movement of the cleaning device 20. The high-pressure jets 23 and 24 have so much power that they are still sufficiently strong through the tubular filter 10 to push off adhering dirt from the outside of the tubular filter 10, even if the liquid to be cleaned is still there.
Die Reinigungsvorrichtung 20 kann dabei dauernd verstellt und gedreht werden oder die Bewegungsvorgänge lassen sich auch periodisch wiederholen. Die Hochdruck-Reinigungsvorrichtung kann aber auch nur bei abgeschalteter Filterung in Betrieb genommen werden. Dies richtet sich nach den gegebenen Betriebsbedingungen der Filterung.The cleaning device 20 can be continuously adjusted and rotated or the movement processes can also be repeated periodically. However, the high-pressure cleaning device can only be put into operation when the filtering is switched off. This depends on the given operating conditions of the filtering.
Um die Abführung des abgedrückten Schmutzes zu verbessern, kann mit der axialen Verstellung der Reinigungsvorrichtung 20 eine Wascheinrichtung 25 axial verstellt und verdreht werden, die die Außenseite des Rohrfilters 10 mit einem Waschstrahl 26 beaufschlagt, der dem gelösten Schmutz dabei gleichzeitig noch eine Bewegungskomponente nach unten aufgibt. Der Schmutz wird im unteren Bereich des Rohrfilters 10 gesammelt und abgeführt. Das Ausführungsbeispiel nach Fig. 2 hat dieselbe Wirkung und kann dieselben Varianten zwischen Filterung und Reinigung aufweisen wie das Ausführungsbeispiel nach Fig. 1 . Der Unterschied liegt nur darin, dass die Reinigungsvorrichtung 20 und die Waschvorrichtung 25 nur eine axiale Abwärts- und Aufwärtsbewegung 30 ausführen. Dafür muss aber das Rohrfilter 10 eine eigene Drehbewegung 40 ausführen, damit die gesamte Außenseite des Rohrfilters 10 durch die Waschvorrichtung 25 vom Schmutz abgewaschen werden kann. In order to improve the removal of the removed dirt, with the axial adjustment of the cleaning device 20, a washing device 25 can be axially adjusted and rotated, which acts on the outside of the tubular filter 10 with a washing jet 26, which at the same time also gives up a moving component downward to the loosened dirt , The dirt is collected in the lower area of the tubular filter 10 and removed. The exemplary embodiment according to FIG. 2 has the same effect and can have the same variants between filtering and cleaning as the exemplary embodiment according to FIG. 1. The only difference is that the cleaning device 20 and the washing device 25 only perform an axial downward and upward movement 30. To do this, however, the tubular filter 10 must perform its own rotary movement 40 so that the entire outside of the tubular filter 10 can be washed off the dirt by the washing device 25.

Claims

A n s p r ü c h eExpectations
Verfahren zum Reinigen eines Filters, das von einer verschmutzten Flüssigkeit durchströmt wird, mittels einer in Gegenstromrichtung verwendeten Reinigungsflüssigkeit zum Entfernen des auf der Außenseite des Filters abgelagerten Schmutz, dadurch gekennzeichnet, dass im Innenraum (1 1 ) des hülsenförmigen, von außen durchströmten Filters (10) axial eine Reinigungsvorrichtung (20) verstellt wird, die mit Hochdruckstrahlen (23, 24) einer Reinigungsflüssigkeit (27) die Wandung des Innenraumes (1 1 ) des Filters (10) beaufschlagt und durch das Filter (10) hindurch den auf der Außenseite desselben haftenden Schmutz abdrückt.Method for cleaning a filter through which a contaminated liquid flows, by means of a cleaning liquid used in the countercurrent direction to remove the dirt deposited on the outside of the filter, characterized in that in the interior (1 1) of the sleeve-shaped filter (10 ) a cleaning device (20) is adjusted axially, which acts on the wall of the interior (11) of the filter (10) with high pressure jets (23, 24) of a cleaning liquid (27) and through the filter (10) on the outside thereof adhering dirt.
Verfahren nach Anspruch 1 , dadurch gekennzeichnet, dass die Reinigungsvorrichtung (20) mit zwei diametral angeordneten DüsenA method according to claim 1, characterized in that the cleaning device (20) with two diametrically arranged nozzles
(21 , 22) bei der axialen Verstellung (30) gleichzeitig in Drehbewegung (31 ) versetzt wird (Fig. 1 ).(21, 22) in the axial adjustment (30) is simultaneously rotated (31) (Fig. 1).
Verfahren nach Anspruch 1 , dadurch gekennzeichnet, dass die Reinigungsvorrichtung (20) mit zwei diametral angeordneten DüsenA method according to claim 1, characterized in that the cleaning device (20) with two diametrically arranged nozzles
(21 , 22) nur axial verstellt wird und dass bei der axialen Verstellung (30) der Reinigungsvorrichtung (20) das Filter (10) in Drehbewegung (40) versetzt wird (Fig. 2).(21, 22) is only adjusted axially and that during the axial adjustment (30) of the cleaning device (20) the filter (10) is rotated (40) (Fig. 2).
4. Verfahren nach Anspruch 2 oder 3, dadurch gekennzeichnet, dass mit der axialen Verstellung (30) der Reinigungsvorrichtung (20) auf der Außenseite des Filters (10) eine Waschvorrichtung (25) axial verstellt wird, mit der mittels eines Waschstrahles (26) die Außenseite des Filters (10) vom Schmutz abgewaschen wird.4. The method according to claim 2 or 3, characterized in that with the axial adjustment (30) of the cleaning device (20) on the outside of the filter (10), a washing device (25) is axially adjusted with which by means of a washing jet (26) the outside of the filter (10) is washed off with dirt.
5. Verfahren nach Anspruch 4, dadurch gekennzeichnet, dass ein Waschstrahl (26) gewählt wird, der schwächer ist als die Hochdruckstrahlen (23, 24) der Reinigungsflüssigkeit (27) der Reinigungsvorrichtung (20) oder gegenüber den Hochdruckstrahlen (23, 24) versetzte Bereich beaufschlagt.5. The method according to claim 4, characterized in that a washing jet (26) is selected which is weaker than the high pressure jets (23, 24) of the cleaning liquid (27) of the cleaning device (20) or offset from the high pressure jets (23, 24) Area acted upon.
6. Verfahren nach einem der Ansprüche 1 bis 5, dadurch gekennzeichnet, dass die Reinigung des Filters (10) bei unterbrochener oder abgeschalteter, zu reinigender Flüssigkeit vorgenommen wird.6. The method according to any one of claims 1 to 5, characterized in that the cleaning of the filter (10) is carried out when the liquid to be cleaned is interrupted or switched off.
7. Verfahren nach einem der Ansprüche 1 bis 5, dadurch gekennzeichnet, dass die Reinigung des Filters (10) während der Filtrierung der zu reinigenden Flüssigkeit in Zeitabständen kurzzeitig vorgenommen wird.7. The method according to any one of claims 1 to 5, characterized in that that the filter (10) is briefly cleaned at intervals during the filtration of the liquid to be cleaned.
8. Verfahren nach einem der Ansprüche 1 bis 7, dadurch gekennzeichnet, dass der Druck der Reinigungsflüssigkeit und der Waschflüssigkeit für die Hochdruckstrahlen (23, 24) und den Waschstrahl (26) einstellbar gemacht wird.8. The method according to any one of claims 1 to 7, characterized in that the pressure of the cleaning liquid and the washing liquid for the high pressure jets (23, 24) and the washing jet (26) is made adjustable.
9. Verfahren nach einem der Ansprüche 1 bis 8, dadurch gekennzeichnet, dass ein Rohrfilter (10) verwendet wird, das kleine Porengröße und große Rückhaltekapazität aufweist. 9. The method according to any one of claims 1 to 8, characterized in that a tubular filter (10) is used, which has a small pore size and large retention capacity.
PCT/EP2003/004318 2002-08-29 2003-04-25 Method for cleaning a filter WO2004020071A1 (en)

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DE10239693A DE10239693A1 (en) 2002-08-29 2002-08-29 Process for cleaning a filter

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CN103140268A (en) * 2010-05-20 2013-06-05 隆·塔尔 Filter cleaning method
CN103140268B (en) * 2010-05-20 2015-12-02 隆·塔尔 Cleaning filter method
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