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DE19723585B4 - Method for cleaning a loaded filter medium - Google Patents

Method for cleaning a loaded filter medium Download PDF

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Publication number
DE19723585B4
DE19723585B4 DE19723585A DE19723585A DE19723585B4 DE 19723585 B4 DE19723585 B4 DE 19723585B4 DE 19723585 A DE19723585 A DE 19723585A DE 19723585 A DE19723585 A DE 19723585A DE 19723585 B4 DE19723585 B4 DE 19723585B4
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DE
Germany
Prior art keywords
filter medium
cleaning
loaded filter
gas
filter
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Expired - Lifetime
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DE19723585A
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German (de)
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DE19723585A1 (en
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Patentinhaber gleich
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Priority to DE19723585A priority Critical patent/DE19723585B4/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
    • B01D46/10—Particle separators, e.g. dust precipitators, using filter plates, sheets or pads having plane surfaces
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D41/00—Regeneration of the filtering material or filter elements outside the filter for liquid or gaseous fluids
    • B01D41/02—Regeneration of the filtering material or filter elements outside the filter for liquid or gaseous fluids of loose filtering material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
    • B01D46/66—Regeneration of the filtering material or filter elements inside the filter
    • B01D46/70—Regeneration of the filtering material or filter elements inside the filter by acting counter-currently on the filtering surface, e.g. by flushing on the non-cake side of the filter
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2275/00—Filter media structures for filters specially adapted for separating dispersed particles from gases or vapours
    • B01D2275/10—Multiple layers

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Filtering Of Dispersed Particles In Gases (AREA)

Abstract

Verfahren zur Reinigung eines beladenen Filtermediums, bei dem das Filtermedium von einem Reinigungsgas in umgekehrter Richtung wie das Rohgas durchströmt wird, dadurch gekennzeichnet, dass sich auf dem Filtermedium (1) auf der Anströmseite des Reinigungsgases eine Oberflächenveredlung (2) aus PTFE befindet.A method for cleaning a loaded filter medium, wherein the filter medium is flowed through by a cleaning gas in the reverse direction as the raw gas, characterized in that on the filter medium (1) on the upstream side of the cleaning gas is a surface treatment (2) made of PTFE.

Description

Die vorliegende Erfindung betrifft ein Verfahren zur Reinigung eines beladenen Filtermediums.The present invention relates to a method for cleaning a loaded filter medium.

Stand der Technik:State of the art:

Unzählige Verfahren und Trägeranordnungen sind bekannt. Die unzähligen Verfahren sind darin begründet auf der Suche nach einer möglichst langen konstanten Druckdifferenz im Filtriervorgang. In den letzten Jahren verbreitet sich immer mehr, dass ein Filtermedium bzw. -träger mit einer PTFE-Folie beschichtet oder getränkt wird. Die neueste Technik ist das Aufbringen einer Meltblownschicht. Dies geschieht immer auf der Anströmseite im Filtrationsprozess.Innumerous methods and carrier arrangements are known. The countless methods are based on the search for the longest possible constant pressure difference in the filtration process. In recent years, more and more that a filter medium or carrier is coated or impregnated with a PTFE film. The latest technology is the application of a meltblown layer. This always happens on the inflow side in the filtration process.

Die Druckschriften DE 196 18 758 A1 , DE 198 10 880 A1 , DE 44 18 033 A1 , EP 0 395 331 A1 US 4 689 058 , US 5 108 474 beschäftigen sich mit dem Aufbau des Filterträgers und deren Anordnung.The pamphlets DE 196 18 758 A1 . DE 198 10 880 A1 . DE 44 18 033 A1 . EP 0 395 331 A1 US 4,689,058 . US 5,108,474 deal with the structure of the filter carrier and their arrangement.

Aufgabenstellung:Task:

Daraus ergibt sich jetzt die Aufgabenstellung, ein Verfahren zu finden, das die Eigenschaft besitzt, eine möglichst lange konstante Druckdifferenz beim Filtriervorgang zu halten.The task now results in finding a method which has the property of keeping the constant pressure difference as long as possible during the filtering process.

Lösung:Solution:

Die Erfindung löst die Aufgabenstellung in der Form, dass sie sich den Gedanken des Gleichrichters, des Demisters zunutze macht. Entgegen dem jetzigen Stand der Technik (siehe 1) wird in der Erfindung die Oberflächenveredlung (2) (PTFE) auf der Abströmseite (siehe 2) angebracht. Das Fluid, beladen mit den Feststoffen, strömt auf das Filtermedium (1) zu, bildet die Filterhilfsschicht (3), dann den Filterkuchen (4). Dieser Prozess geht solange, bis der Druckverlust den Volumenstrom unter das Minimum drückt. Stand der Technik ist heute, dass mittels des Gegenspülens mit Druckluft, mit Vibrationen, Klopfen der Filterkuchen (4) wieder abgeworfen wird. Dadurch sinkt wieder die Druckdifferenz (von E auf D). Genau in diesem Augenblick durchdringt das Reinigungsgas den Filterträger (1) und wird dann an der Oberflächenveredlung (2) abgebremst, dann in der Filterhilfsschicht (3) abgebremst, erst dann kommt es zum Ablösen des Filterkuchens (4). Die Erfindung macht sich diese Erkenntnis zunutze und bringt die Oberflächenveredlung (2) gegen den Stand der Technik auf der Abströmseite an. Das Reinigungsgas passiert im Reinigungsprozess zuerst die Oberflächenveredlung (2), strömt mit hoher Geschwindigkeit durch die Poren und löst den Filterkuchen (4) sanft ab, fluidisiert diesen aber nicht. Dies erklärt auch den niedrigeren Reingaswert bei dieser Anordnung (siehe 2). Beim Anströmen des Rohgasstromes geschieht es genau umgekehrt, der beladene Rohgasstrom strömt zuerst auf den Träger (1), das Trägergas durchströmt den Filterträger (1), wird etwas abgebremst und seine Energie beim Durchströmen der Oberflächenveredlung (2). Dadurch findet eine bessere Gleichrichterwirkung der Strömung im Filtrations- und Trennprozess statt. Dies ist eine weitere Erklärung, warum bei der Umdrehung der Oberflächenveredlung (2) niedrigere Reingaswerte und bessere Standzeiten erzielt werden.The invention solves the problem in the form that it uses the idea of the rectifier, the demister. Contrary to the current state of the art (see 1 ) in the invention the surface finishing ( 2 ) (PTFE) on the downstream side (see 2 ) appropriate. The fluid loaded with the solids flows onto the filter medium ( 1 ), the filter auxiliary layer ( 3 ), then the filter cake ( 4 ). This process continues until the pressure loss pushes the volume flow below the minimum. The state of the art today is that by means of counter-flushing with compressed air, with vibrations, knocking of the filter cake ( 4 ) is discarded again. This reduces the pressure difference again (from E to D). Just at this moment, the cleaning gas penetrates the filter carrier ( 1 ) and then at the surface finishing ( 2 ), then in the filter auxiliary layer ( 3 ), only then it comes to the detachment of the filter cake ( 4 ). The invention makes use of this finding and brings the surface finishing ( 2 ) against the state of the art on the downstream side. The cleaning gas first passes through the surface finishing in the cleaning process ( 2 ), flows through the pores at high speed and dissolves the filter cake ( 4 ), but does not fluidize it. This also explains the lower clean gas value in this arrangement (see 2 ). When flowing the raw gas stream, it happens exactly the other way around, the loaded raw gas stream flows first on the carrier ( 1 ), the carrier gas flows through the filter carrier ( 1 ), is slowed down a bit and its energy when flowing through the surface treatment ( 2 ). This results in a better rectifying effect of the flow in the filtration and separation process. This is another explanation why during the revolution of the surface finishing ( 2 ) lower clean gas values and better service lives are achieved.

Claims (1)

Verfahren zur Reinigung eines beladenen Filtermediums, bei dem das Filtermedium von einem Reinigungsgas in umgekehrter Richtung wie das Rohgas durchströmt wird, dadurch gekennzeichnet, dass sich auf dem Filtermedium (1) auf der Anströmseite des Reinigungsgases eine Oberflächenveredlung (2) aus PTFE befindet.A method for cleaning a loaded filter medium, wherein the filter medium is flowed through by a cleaning gas in the reverse direction as the raw gas, characterized in that on the filter medium ( 1 ) on the upstream side of the cleaning gas, a surface treatment ( 2 ) is made of PTFE.
DE19723585A 1997-06-05 1997-06-05 Method for cleaning a loaded filter medium Expired - Lifetime DE19723585B4 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE19723585A DE19723585B4 (en) 1997-06-05 1997-06-05 Method for cleaning a loaded filter medium

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19723585A DE19723585B4 (en) 1997-06-05 1997-06-05 Method for cleaning a loaded filter medium

Publications (2)

Publication Number Publication Date
DE19723585A1 DE19723585A1 (en) 1998-12-10
DE19723585B4 true DE19723585B4 (en) 2013-07-25

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Family Applications (1)

Application Number Title Priority Date Filing Date
DE19723585A Expired - Lifetime DE19723585B4 (en) 1997-06-05 1997-06-05 Method for cleaning a loaded filter medium

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DE (1) DE19723585B4 (en)

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4689058A (en) * 1986-02-07 1987-08-25 Kimberly-Clark Corporation Disposable stove hood filter
EP0395331A1 (en) * 1989-04-26 1990-10-31 Japan Gore-Tex, Inc. Electret filter material
US5108474A (en) * 1991-01-03 1992-04-28 W. L. Gore & Associates, Inc. Smoke filter
DE9301950U1 (en) * 1993-02-11 1993-04-01 Airtex Filter GmbH, 7859 Efringen-Kirchen filter
DE4418033A1 (en) * 1994-05-24 1995-11-30 Herding Entstaubung Filter element with fiber coating and process for its production
DE4443158A1 (en) * 1994-12-05 1996-06-13 Gessner & Co Gmbh Cleanable gas filter
DE19610880A1 (en) * 1995-08-15 1997-02-20 Inst Umwelttechnologie Und Umw Filters, especially mouth guards
DE19618758A1 (en) * 1996-05-09 1997-11-13 Gessner & Co Gmbh Single or multi-layer washable filter medium, especially for air

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4689058A (en) * 1986-02-07 1987-08-25 Kimberly-Clark Corporation Disposable stove hood filter
EP0395331A1 (en) * 1989-04-26 1990-10-31 Japan Gore-Tex, Inc. Electret filter material
US5108474A (en) * 1991-01-03 1992-04-28 W. L. Gore & Associates, Inc. Smoke filter
DE9301950U1 (en) * 1993-02-11 1993-04-01 Airtex Filter GmbH, 7859 Efringen-Kirchen filter
DE4418033A1 (en) * 1994-05-24 1995-11-30 Herding Entstaubung Filter element with fiber coating and process for its production
DE4443158A1 (en) * 1994-12-05 1996-06-13 Gessner & Co Gmbh Cleanable gas filter
DE19610880A1 (en) * 1995-08-15 1997-02-20 Inst Umwelttechnologie Und Umw Filters, especially mouth guards
DE19618758A1 (en) * 1996-05-09 1997-11-13 Gessner & Co Gmbh Single or multi-layer washable filter medium, especially for air

Also Published As

Publication number Publication date
DE19723585A1 (en) 1998-12-10

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