US2874802A - Method for cleaning the electrodes in electro-filters - Google Patents

Method for cleaning the electrodes in electro-filters Download PDF

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Publication number
US2874802A
US2874802A US520344A US52034455A US2874802A US 2874802 A US2874802 A US 2874802A US 520344 A US520344 A US 520344A US 52034455 A US52034455 A US 52034455A US 2874802 A US2874802 A US 2874802A
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Prior art keywords
electrodes
cleaning
liquid
electro
filters
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US520344A
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Gustafsson Stig
Ohnfeldt Per-Olof
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Svenska Flaktfabriken AB
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Svenska Flaktfabriken AB
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    • CCHEMISTRY; METALLURGY
    • C25ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25BELECTROLYTIC OR ELECTROPHORETIC PROCESSES FOR THE PRODUCTION OF COMPOUNDS OR NON-METALS; APPARATUS THEREFOR
    • C25B11/00Electrodes; Manufacture thereof not otherwise provided for
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B03SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03CMAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03C3/00Separating dispersed particles from gases or vapour, e.g. air, by electrostatic effect
    • B03C3/34Constructional details or accessories or operation thereof
    • B03C3/74Cleaning the electrodes
    • B03C3/78Cleaning the electrodes by washing

Description

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
US520344A 1954-07-07 1955-07-06 Method for cleaning the electrodes in electro-filters Expired - Lifetime US2874802A (en)

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SE2874802X 1954-07-07

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DE (1) DE1009163B (en)
FR (1) FR1126708A (en)
GB (1) GB769865A (en)

Cited By (21)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3501898A (en) * 1965-03-05 1970-03-24 Svenska Flaektfabriken Ab Emitting electrode assembly for electrostatic precipitators
US3958960A (en) * 1973-02-02 1976-05-25 United States Filter Corporation Wet electrostatic precipitators
US3958961A (en) * 1973-02-02 1976-05-25 United States Filter Corporation Wet electrostatic precipitators
US3988130A (en) * 1975-09-24 1976-10-26 The Trane Company Electrostatic precipitator with rapper and pneumatic flow blocking
US4265641A (en) * 1979-05-18 1981-05-05 Monsanto Company Method and apparatus for particle charging and particle collecting
US4455155A (en) * 1982-07-30 1984-06-19 Allis-Chalmers Corp. Electrostatic collecting assembly
US5160351A (en) * 1990-06-09 1992-11-03 Metallgesellschaft Aktiengesellschaft Process of and apparatus for cleaning a dedusting electrostatic precipitator
US5624476A (en) * 1991-08-21 1997-04-29 Ecoprocess Method and device for purifying gaseous effluents
US6235088B1 (en) * 1997-04-21 2001-05-22 Kazuo Matsuura Alcohol separator for an alcohol solution
US6488740B1 (en) 2000-03-01 2002-12-03 Electric Power Research Institute, Inc. Apparatus and method for decreasing contaminants present in a flue gas stream
US6533841B1 (en) * 1997-06-30 2003-03-18 Toftejorg A/S Method and rinsing equipment for the cleaning of especially filter plates in an electro-filter
US20040261673A1 (en) * 2003-04-11 2004-12-30 Allen Gary W. Reduced-emissions fossil-fuel-fired system
US20060201328A1 (en) * 2005-03-08 2006-09-14 Fancy Food Service Equipment Co., Ltd. Air filter device for air exhauster
US20060226373A1 (en) * 2005-03-02 2006-10-12 Eisenmann Corporation Wet electrostatic precipitator for treating oxidized biomass effluent
US20060261265A1 (en) * 2005-03-02 2006-11-23 Eisenmann Corporation Dual flow wet electrostatic precipitator
US20070009411A1 (en) * 2005-07-08 2007-01-11 Eisenmann Corporation Method and apparatus for particulate removal and undesirable vapor scrubbing from a moving gas stream
US20070128090A1 (en) * 2005-12-06 2007-06-07 Eisenmann Corporation Wet 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
US20080216658A1 (en) * 2007-03-05 2008-09-11 Hitachi Plant Technologies, Ltd. Wet-type electrostatic precipitator
US20090114092A1 (en) * 2006-06-07 2009-05-07 Sune Bengtsson Wet electrostatic precipitator
US20110252965A1 (en) * 2008-11-20 2011-10-20 Fachhochschule Gelsenkirchen Wet-cleaning electrostatic filter for cleaning exhaust gas and a suitable method for the same
US10926272B2 (en) * 2017-06-30 2021-02-23 Das Environmental Expert Gmbh Electrostatic precipitator and method for electrostatic precipitation of materials out of an exhaust gas flow

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1329737A (en) * 1919-03-19 1920-02-03 Int Precipitation Co Method of precipitating suspended material from furnace-gases
US1329817A (en) * 1917-07-05 1920-02-03 Int Precipitation Co Art of precipitating suspended material from gases
US1905993A (en) * 1930-08-29 1933-04-25 Int Precipitation Co Treatment of gases
US2171617A (en) * 1937-02-13 1939-09-05 Research Corp Gas treatment
US2748889A (en) * 1955-06-08 1956-06-05 Research Corp Electrostatic precipitator

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE597577C (en) * 1930-02-21 1934-05-28 Siemens Ag Process for humidifying gases to be cleaned electrically in the electronic wet filter

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1329817A (en) * 1917-07-05 1920-02-03 Int Precipitation Co Art of precipitating suspended material from gases
US1329737A (en) * 1919-03-19 1920-02-03 Int Precipitation Co Method of precipitating suspended material from furnace-gases
US1905993A (en) * 1930-08-29 1933-04-25 Int Precipitation Co Treatment of gases
US2171617A (en) * 1937-02-13 1939-09-05 Research Corp Gas treatment
US2748889A (en) * 1955-06-08 1956-06-05 Research Corp Electrostatic precipitator

Cited By (33)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3501898A (en) * 1965-03-05 1970-03-24 Svenska Flaektfabriken Ab Emitting electrode assembly for electrostatic precipitators
US3958960A (en) * 1973-02-02 1976-05-25 United States Filter Corporation Wet electrostatic precipitators
US3958961A (en) * 1973-02-02 1976-05-25 United States Filter Corporation Wet electrostatic precipitators
US4074983A (en) * 1973-02-02 1978-02-21 United States Filter Corporation Wet electrostatic precipitators
US3988130A (en) * 1975-09-24 1976-10-26 The Trane Company Electrostatic precipitator with rapper and pneumatic flow blocking
US4265641A (en) * 1979-05-18 1981-05-05 Monsanto Company Method and apparatus for particle charging and particle collecting
US4455155A (en) * 1982-07-30 1984-06-19 Allis-Chalmers Corp. Electrostatic collecting assembly
US5160351A (en) * 1990-06-09 1992-11-03 Metallgesellschaft Aktiengesellschaft Process of and apparatus for cleaning a dedusting electrostatic precipitator
US5624476A (en) * 1991-08-21 1997-04-29 Ecoprocess Method and device for purifying gaseous effluents
US6235088B1 (en) * 1997-04-21 2001-05-22 Kazuo Matsuura Alcohol separator for an alcohol solution
US6533841B1 (en) * 1997-06-30 2003-03-18 Toftejorg A/S Method and rinsing equipment for the cleaning of especially filter plates in an electro-filter
US6488740B1 (en) 2000-03-01 2002-12-03 Electric Power Research Institute, Inc. Apparatus and method for decreasing contaminants present in a flue gas stream
US20100024290A1 (en) * 2003-04-11 2010-02-04 Stockhausen, Inc. Fuel usable to control the emissions and/or opacity of gas released into the atmosphere
US8425631B2 (en) 2003-04-11 2013-04-23 Evonik Stockhausen, Llc Fuel usable to control the emissions and/or opacity of gas released into the atmosphere
US20100024697A1 (en) * 2003-04-11 2010-02-04 Stockhausen, Inc. Preparation of fuel usable in a fossil-fuel-fired system
US8257451B2 (en) 2003-04-11 2012-09-04 Evonik Stockhausen, Llc Preparation of fuel usable in a fossil-fuel-fired system
US20040261673A1 (en) * 2003-04-11 2004-12-30 Allen Gary W. Reduced-emissions fossil-fuel-fired system
US8117975B2 (en) 2003-04-11 2012-02-21 Evonik Stockhausen, Llc Fossil-fuel-fired system having reduced emissions and method of operating the same
US20060226373A1 (en) * 2005-03-02 2006-10-12 Eisenmann Corporation Wet electrostatic precipitator for treating oxidized biomass effluent
US7297182B2 (en) 2005-03-02 2007-11-20 Eisenmann Corporation Wet electrostatic precipitator for treating oxidized biomass effluent
US7318857B2 (en) 2005-03-02 2008-01-15 Eisenmann Corporation Dual flow wet electrostatic precipitator
US20060261265A1 (en) * 2005-03-02 2006-11-23 Eisenmann Corporation Dual flow wet electrostatic precipitator
US7132009B2 (en) * 2005-03-08 2006-11-07 Fancy Food Service Equipment Co., Ltd. Air filter device for air exhauster
US20060201328A1 (en) * 2005-03-08 2006-09-14 Fancy Food Service Equipment Co., Ltd. Air filter device for air exhauster
US20070009411A1 (en) * 2005-07-08 2007-01-11 Eisenmann Corporation Method and apparatus for particulate removal and undesirable vapor scrubbing from a moving gas stream
US20070128090A1 (en) * 2005-12-06 2007-06-07 Eisenmann Corporation Wet 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
US8088198B2 (en) * 2006-06-07 2012-01-03 Alstom Technology Ltd Wet electrostatic precipitator
US20090114092A1 (en) * 2006-06-07 2009-05-07 Sune Bengtsson Wet electrostatic precipitator
US7662219B2 (en) * 2007-03-05 2010-02-16 Hitachi Plant Technologies, Ltd. Wet type electrostatic precipitator
US20080216658A1 (en) * 2007-03-05 2008-09-11 Hitachi Plant Technologies, Ltd. Wet-type electrostatic precipitator
US20110252965A1 (en) * 2008-11-20 2011-10-20 Fachhochschule Gelsenkirchen Wet-cleaning electrostatic filter for cleaning exhaust gas and a suitable method for the same
US9321056B2 (en) * 2008-11-20 2016-04-26 Westfaelische Hochschule Gelsenkirchen, Bocholt, Recklinghausen Wet-cleaning electrostatic filter for cleaning exhaust gas and a suitable method for the same
US10926272B2 (en) * 2017-06-30 2021-02-23 Das Environmental Expert Gmbh Electrostatic precipitator and method for electrostatic precipitation of materials out of an exhaust gas flow

Also Published As

Publication number Publication date
FR1126708A (en) 1956-11-29
DE1009163B (en) 1957-05-29
GB769865A (en) 1957-03-13

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