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Publication numberUS2874802 A
Publication typeGrant
Publication dateFeb 24, 1959
Filing dateJul 6, 1955
Priority dateJul 7, 1954
Also published asDE1009163B
Publication numberUS 2874802 A, US 2874802A, US-A-2874802, US2874802 A, US2874802A
InventorsOhnfeldt Per-Olof, Gustafsson Stig
Original AssigneeSvenska Flaektfabriken Ab
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Method for cleaning the electrodes in electro-filters
US 2874802 A
Abstract  available in
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Claims  available in
Description  (OCR text may contain errors)

Feb. 24, 1959 s. GUSTAFSSON ET AL 2,874,802

METHOD FOR CLEANING 'IHE ELECTRODES IN ELECTRO-FILTERS Filed July 6, 1955 FIE. I.

0. 3 Mu 11. all f n m fl/ "J 7 v/m m M f m n 5 6r 1 l 3 IIIIPIHHHHHIIII United States Patent filic Patented Feb. 24, 1959 METHOD FOR CLEANING THE ELECTRODES IN ELECTRO-FILTERS Stig Gustafsson, Jonkoping, and Per-olof hnfeldt, Lidingo, Sweden, assignors to Aktiebolaget Svenska Flaktfabriken, Stockholm, Sweden Application July 6, 1955, Serial No. 520,344

Claims priority, application Sweden July 7, 1954 2 Claims. (Cl. 183-114) The present invention relates to a method for cleaning of the electrodes of electrical precipitators by flushing the electrodes with liquid. In electrical precipitators for gases which on the electrodes cause deposits which cannot be mechanically removed by vibrating or the like it is common to flush the electrodes. In order to avoid interruption of the operation of the precipitators during the flushing it has previously been necessary to use limited quantities of liquid whereby mainly the collecting electrodes have been subjected to said liquid. Because of this the flushing of said collecting electrodes has been unsatisfactory and, further, it has not been possible to remove the dust being accumulated on the emission electrodes.

It is an object of the method according to the invention to eliminate these drawbacks.

All of the objects of the invention, and a suitable apparatus to which the invention may be applied are set forth more fully hereinafter with reference to the accompanying drawing, wherein:

Fig. 1 is a longitudinal section through a precipitator equipped to perform the method of the present invention;

Fig. 2 is a sectional view taken on the line 2-2 of Fig. 1; and,

Fig. 3 is a sectional view taken on the line 3-3 of Fig. l.

The method is characterized in that the flushing is performed by means of two separate spray systems 11 and 14 in such a manner that the liquid is supplied in part continuously in the form of one or more curtains 16 of liquid atomized by spray nozzles 15 in the system 14, said curtains being perpendicular to the flow direction of the gas, and in part intermittently with greater intensity in form of similar vertical liquid curtains 17 which are parallel to the gas flow and are formed by nozzles or apertures in the system 11.

According to the invention the liquid particles in the continuous flushing system 14 are evenly distributed on the collecting electrodes 12 by the influence of the electrical field in spite of the fact that the quantity of liquid is limited to such an extent which is suitable for the uninterrupted running of the precipitator. By the cooperation between said continuous flushing system 14 and 2' the intermittent but intensive system 11, both the collecting electrodes 12 and the emission electrodes 9 will be thoroughly cleaned.

The illustrated apparatus comprises an electrical precipitator 7 having horizontal gas flow from the inlet 1 to the outlet 13 and being provided with one or more sections of vertical sheet-like collecting electrodes 12 arranged parallel to the gas flow and with intermediate spaced rows of emission electrodes 9. The emission electrodes 9 comprise wires stretched in conventional manner within supporting frames 8 which are supported in the casing 7 by insulators 6. The sheet-like collecting electrodes 12 are arranged intermediate the frames 8.

The continuous flushing system 14 may be connected to a supply pipe 2 by a branch conduit 3. The intermittent flushing system 11 may be connected to the supply pipe 2 by a branch conduit 5 having an automatic valve 4 therein which is actuated by a suitable timing device or the like which effects intermittent operation of the system 11.

While a particular precipitator is shown in the drawing, the invention may be applied to any other suitable precipitator within the scope of the following claims.

What we claim:

1. The method for cleaning electrodes in electrical precipitators having horizontal gas flow therein between vertical sheet-like collecting electrodes arranged parallel to the flow and intermediate rows of emission electrodes, comprising the steps of continuously causing the gas to flow horizontally through said precipitator and forming a vertical curtain of liquid perpendicular to the gas flow within said precipitator in advance of said collecting electrodes whereby liquid particles from said curtain are entrained in said flow and distributed to the collecting electrodes to partially liquify the deposit thereon and flush the same, the flushed deposit continuously flowing downward on said vertical electrodes transversely to said horizontal gas flow, and intermittently forming other curtains of atomized liquid parallel to the sheet-like collecting electrodes and the gas flow intermediate said electrodes to thoroughly clean both the emission and collecting electrodes.

2. A method according to claim 1 wherein the quantity of liquid in the continuous curtain is limited to an extent which is suitable for the uninterrupted running of the precipitator, and wherein further the operation of the intermittent curtain is more intensive than said continuous curtain.

References Cited in the file of this patent UNITED STATES PATENTS 1,329,737 Wolcott Feb. 3, 1920 1,329,817 Wolcott Feb. 3, 1920 1,905,993 Buff Apr. 25, 1933 2,171,617 Wintermute Sept. 5, 1939 2,748,889 Rcnwanz June 5, 1956

Patent Citations
Cited PatentFiling datePublication dateApplicantTitle
US1329737 *Mar 19, 1919Feb 3, 1920Int Precipitation CoMethod of precipitating suspended material from furnace-gases
US1329817 *Jul 5, 1917Feb 3, 1920Int Precipitation CoArt of precipitating suspended material from gases
US1905993 *Aug 26, 1931Apr 25, 1933Int Precipitation CoTreatment of gases
US2171617 *Feb 13, 1937Sep 5, 1939Research CorpGas treatment
US2748889 *Jun 8, 1955Jun 5, 1956Research CorpElectrostatic precipitator
Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US3501898 *Mar 3, 1966Mar 24, 1970Svenska Flaektfabriken AbEmitting electrode assembly for electrostatic precipitators
US3958960 *Feb 2, 1973May 25, 1976United States Filter CorporationWet electrostatic precipitators
US3958961 *Oct 15, 1974May 25, 1976United States Filter CorporationWet electrostatic precipitators
US3988130 *Sep 24, 1975Oct 26, 1976The Trane CompanyElectrostatic precipitator with rapper and pneumatic flow blocking
US4074983 *Jan 14, 1976Feb 21, 1978United States Filter CorporationWet electrostatic precipitators
US4265641 *May 18, 1979May 5, 1981Monsanto CompanyMethod and apparatus for particle charging and particle collecting
US4455155 *Jul 30, 1982Jun 19, 1984Allis-Chalmers Corp.Electrostatic collecting assembly
US5160351 *May 24, 1991Nov 3, 1992Metallgesellschaft AktiengesellschaftProcess of and apparatus for cleaning a dedusting electrostatic precipitator
US5624476 *Aug 20, 1992Apr 29, 1997EcoprocessMethod and device for purifying gaseous effluents
US6235088 *May 14, 1999May 22, 2001Kazuo MatsuuraAlcohol separator for an alcohol solution
US6488740Feb 28, 2001Dec 3, 2002Electric Power Research Institute, Inc.Apparatus and method for decreasing contaminants present in a flue gas stream
US6533841 *Jun 29, 1998Mar 18, 2003Toftejorg A/SMethod and rinsing equipment for the cleaning of especially filter plates in an electro-filter
US7132009 *Mar 8, 2005Nov 7, 2006Fancy Food Service Equipment Co., Ltd.Air filter device for air exhauster
US7297182Jun 6, 2006Nov 20, 2007Eisenmann CorporationWet electrostatic precipitator for treating oxidized biomass effluent
US7318857Mar 2, 2006Jan 15, 2008Eisenmann CorporationDual flow wet electrostatic precipitator
US7662219 *Feb 16, 2010Hitachi Plant Technologies, Ltd.Wet type electrostatic precipitator
US8088198 *May 23, 2007Jan 3, 2012Alstom Technology LtdWet electrostatic precipitator
US8117975Oct 12, 2009Feb 21, 2012Evonik Stockhausen, LlcFossil-fuel-fired system having reduced emissions and method of operating the same
US8257451Sep 4, 2012Evonik Stockhausen, LlcPreparation of fuel usable in a fossil-fuel-fired system
US8425631Apr 23, 2013Evonik Stockhausen, LlcFuel usable to control the emissions and/or opacity of gas released into the atmosphere
US9321056 *Nov 19, 2009Apr 26, 2016Westfaelische Hochschule Gelsenkirchen, Bocholt, RecklinghausenWet-cleaning electrostatic filter for cleaning exhaust gas and a suitable method for the same
US20040261673 *Apr 2, 2004Dec 30, 2004Allen Gary W.Reduced-emissions fossil-fuel-fired system
US20060201328 *Mar 8, 2005Sep 14, 2006Fancy Food Service Equipment Co., Ltd.Air filter device for air exhauster
US20060226373 *Jun 6, 2006Oct 12, 2006Eisenmann CorporationWet electrostatic precipitator for treating oxidized biomass effluent
US20060261265 *Mar 2, 2006Nov 23, 2006Eisenmann CorporationDual flow wet electrostatic precipitator
US20070009411 *Jul 7, 2006Jan 11, 2007Eisenmann CorporationMethod and apparatus for particulate removal and undesirable vapor scrubbing from a moving gas stream
US20070128090 *Dec 6, 2006Jun 7, 2007Eisenmann CorporationWet electrostatic liquid film oxidizing reactor apparatus and method for removal of NOx, SOx, mercury, acid droplets, heavy metals and ash particles from a moving gas
US20080216658 *Feb 28, 2008Sep 11, 2008Hitachi Plant Technologies, Ltd.Wet-type electrostatic precipitator
US20090114092 *May 23, 2007May 7, 2009Sune BengtssonWet electrostatic precipitator
US20100024290 *Feb 4, 2010Stockhausen, Inc.Fuel usable to control the emissions and/or opacity of gas released into the atmosphere
US20100024697 *Oct 12, 2009Feb 4, 2010Stockhausen, Inc.Preparation of fuel usable in a fossil-fuel-fired system
US20110252965 *Nov 19, 2009Oct 20, 2011Fachhochschule GelsenkirchenWet-cleaning electrostatic filter for cleaning exhaust gas and a suitable method for the same
Classifications
U.S. Classification95/71, 95/75, 96/44, 96/53
International ClassificationB03C3/78, B03C3/34, C25B11/00
Cooperative ClassificationC25B11/00, B03C3/78
European ClassificationB03C3/78, C25B11/00