US2822058A - Electrostatic precipitators - Google Patents
Electrostatic precipitators Download PDFInfo
- Publication number
- US2822058A US2822058A US531416A US53141655A US2822058A US 2822058 A US2822058 A US 2822058A US 531416 A US531416 A US 531416A US 53141655 A US53141655 A US 53141655A US 2822058 A US2822058 A US 2822058A
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- Prior art keywords
- casing
- wire
- screen
- mat
- ionizer
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B03—SEPARATION 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
- B03C—MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03C3/00—Separating dispersed particles from gases or vapour, e.g. air, by electrostatic effect
- B03C3/02—Plant or installations having external electricity supply
- B03C3/04—Plant or installations having external electricity supply dry type
- B03C3/14—Plant or installations having external electricity supply dry type characterised by the additional use of mechanical effects, e.g. gravity
- B03C3/155—Filtration
Definitions
- This invention relates to electrostatic precipitators for removing small foreign particles such as dust from gases such as air.
- Fig. 1 is a side section of an electrostatic precipitator embodying this invention.
- Fig. 2 is a section along the line 2--2 of Fig. l.
- a rectangular metal casing has an open air inlet end l1 and ⁇ an opposite open air outlet end 12.
- a mat 13 of dielectric filaments preferably of the glass wool type, has a meshed metal wire screen 14 in contact with its downstream side, and has a similar screen 15 in contact with its upstream side.
- the downstream screen is grounded to the casing 10 while the upstream screen is insulated from the casing by the insulating plates 16 which extend between its ends and the casing.
- the insulating plates 16 extend from the mat 13 towards the air inlet 11, and have secured to their inner sides, the metal ionizer plates 17, insulating such plates 17 from the casing.
- An ionizer wire 18 is supported by a pair of insulators 19 from opposite side walls of the 2,822,058 Patented Feb. 4, 1958 ice casing midway between the metal plates 17 which are non discharging ionizer electrodes.
- 'I'he ionizer wire 18 is connected to the positive highvoltage terminal of a conventional power pack 20, the negative terminal of which is grounded.
- the upstream screen 15 is connected to the metal plate 17 and to one end of a variable resistor 21, the other end of which is connected to the downstream screen 14 and to ground.
- ionization current instead of owing between an ionizer wire and its grounded non-discharging ionizer electrodes as usually occurs, flows to the plates 17 and through the series resistor 21 to ground.
- This resistor has its ends connected to the upstream and downstream screens 15 and 14 respectively, so that the voltage drop across it is the voltage across the mat 13. This voltage remains substantially constant since using a regulated power pack, the ionization current remains substantially constant.
- the dust particles in the air to be cleaned are given positive electrostatic charges as they pass between the ionizer wire 18 and the metal plates 17, and are collected by the electrostatically charged mat 13.
- An electrostatic precipitator comprising a mat of dielectric filaments, metal screens on opposite sides of said mat, an electric resistor connected at its ends to said screens, an ionizer wire, non-discharging ionizer electrodes on opposite sides of said wire, means connecting said electrodes to one of said screens, a high voltage, direct current power supply, means for connecting said wire to a terminal of said supply having one polarity, and means connecting said other screen to a terminal of said supply having the opposite polarity.
- An electrostatic precipitator comprising a metal casing having an open air inlet and an open air outlet, a mat of dielectric filaments extending cross-wise said casing between said inlet and outlet, a metal screen between said mat vand said outlet in contact with said casing, a second metal screen between said mat and said inlet, said second screen being insulated from said casing, an ionizer wire insulatedly supported from said casing, non-discharging ionizer electrodes on opposite sides of said wire, means insulatedly supporting said electrodes from said casing, an electric resistor connected at its ends to said screens, a high voltage, direct current power supply, means connecting said wire to a positive high voltage terminal of said supply, and means connecting said casing to the negative terminal of said supply.
Description
Feb. 4, 1958 w. J. Roos El' AL ELECTROSTATIC PRECIPITATORS Filed Aug. zo, 1255 4 POWER 2O ff PACK 4 ,Eal L. Zzelzazdia Y zz/ezzvzi l by Maag United states Patent O ELECTROS'I'ATIC PRECIPITATORS William J. Roos, Sharon, and Earl L. Richardson, Hyde Park, Mass., assignors to Westinghouse Electric Corporation, East Pittsburgh, Pa., a corporation of Penn- Sylvania Application August 30, 1955, Serial No. 531,416
2 Claims. (Cl. 183-7) This invention relates to electrostatic precipitators for removing small foreign particles such as dust from gases such as air.
Intermeshed dielectric laments such as are used in mechanical filters of the glass and fibre wool type, are easily given electrostatic charges, and many attempts have been made to use them commercially as electrostatic precipitators. They are, however, erratic in that they will not hold a uniform electrostatic charge. Often they are charged to too high a voltage so that sparks occur therein, or to too low a voltage for effective collection. This invention instead of permitting such a filter to float in an electrostatic field where it would assume an uncontrolled charge, connects an electric resistor through which the ionization current is caused to flow, across the filter so that the voltage drop in the resistor determines accurately the charge on the filter, and maintains a uniform charge.
An object of this invention is to improve the methods of applying electrostatic charges to filters of dielectric filaments.
This invention will now be described with reference to the annexed drawings, of which:
Fig. 1 is a side section of an electrostatic precipitator embodying this invention, and
Fig. 2 is a section along the line 2--2 of Fig. l.
A rectangular metal casing has an open air inlet end l1 and `an opposite open air outlet end 12. A mat 13 of dielectric filaments, preferably of the glass wool type, has a meshed metal wire screen 14 in contact with its downstream side, and has a similar screen 15 in contact with its upstream side. The downstream screen is grounded to the casing 10 while the upstream screen is insulated from the casing by the insulating plates 16 which extend between its ends and the casing.
The insulating plates 16 extend from the mat 13 towards the air inlet 11, and have secured to their inner sides, the metal ionizer plates 17, insulating such plates 17 from the casing. An ionizer wire 18 is supported by a pair of insulators 19 from opposite side walls of the 2,822,058 Patented Feb. 4, 1958 ice casing midway between the metal plates 17 which are non discharging ionizer electrodes.
'I'he ionizer wire 18 is connected to the positive highvoltage terminal of a conventional power pack 20, the negative terminal of which is grounded. The upstream screen 15 is connected to the metal plate 17 and to one end of a variable resistor 21, the other end of which is connected to the downstream screen 14 and to ground.
In operation, ionization current instead of owing between an ionizer wire and its grounded non-discharging ionizer electrodes as usually occurs, flows to the plates 17 and through the series resistor 21 to ground. This resistor has its ends connected to the upstream and downstream screens 15 and 14 respectively, so that the voltage drop across it is the voltage across the mat 13. This voltage remains substantially constant since using a regulated power pack, the ionization current remains substantially constant.
The dust particles in the air to be cleaned are given positive electrostatic charges as they pass between the ionizer wire 18 and the metal plates 17, and are collected by the electrostatically charged mat 13.
What we claim as our invention is:
1. An electrostatic precipitator comprising a mat of dielectric filaments, metal screens on opposite sides of said mat, an electric resistor connected at its ends to said screens, an ionizer wire, non-discharging ionizer electrodes on opposite sides of said wire, means connecting said electrodes to one of said screens, a high voltage, direct current power supply, means for connecting said wire to a terminal of said supply having one polarity, and means connecting said other screen to a terminal of said supply having the opposite polarity.
2. An electrostatic precipitator comprising a metal casing having an open air inlet and an open air outlet, a mat of dielectric filaments extending cross-wise said casing between said inlet and outlet, a metal screen between said mat vand said outlet in contact with said casing, a second metal screen between said mat and said inlet, said second screen being insulated from said casing, an ionizer wire insulatedly supported from said casing, non-discharging ionizer electrodes on opposite sides of said wire, means insulatedly supporting said electrodes from said casing, an electric resistor connected at its ends to said screens, a high voltage, direct current power supply, means connecting said wire to a positive high voltage terminal of said supply, and means connecting said casing to the negative terminal of said supply.
References Cited in the file of this patent UNITED STATES PATENTS 2,297,601 Williams Sept. 29, 1942 2,579,441 Palmer Dec. 18, 1951 2,579,445 Warburton Dec. 18, 1951
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US531416A US2822058A (en) | 1955-08-30 | 1955-08-30 | Electrostatic precipitators |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US531416A US2822058A (en) | 1955-08-30 | 1955-08-30 | Electrostatic precipitators |
Publications (1)
Publication Number | Publication Date |
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US2822058A true US2822058A (en) | 1958-02-04 |
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Application Number | Title | Priority Date | Filing Date |
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US531416A Expired - Lifetime US2822058A (en) | 1955-08-30 | 1955-08-30 | Electrostatic precipitators |
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Cited By (23)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2973054A (en) * | 1956-02-15 | 1961-02-28 | Philco Corp | Gas cleaning unit |
US3073094A (en) * | 1960-05-23 | 1963-01-15 | Trion Inc | Electrostatic filter panel |
US3201620A (en) * | 1959-12-21 | 1965-08-17 | Earle W Balientine | Triboelectric generator for ionizing air |
US3400513A (en) * | 1966-09-08 | 1968-09-10 | Babcock & Wilcox Co | Electrostatic precipitator |
US3495379A (en) * | 1967-07-28 | 1970-02-17 | Cottrell Res Inc | Discharge electrode configuration |
US3520110A (en) * | 1966-12-19 | 1970-07-14 | Hughes Aircraft Co | Electrical isolator for gas feed line |
US3763633A (en) * | 1971-02-09 | 1973-10-09 | C Soltis | Electrostatic air filter |
US3800509A (en) * | 1972-02-14 | 1974-04-02 | Carrier Corp | Electrostatic precipitator |
DE2622934A1 (en) * | 1975-05-22 | 1976-12-09 | Dart Ind Inc | COLLECTOR ELECTRODES FOR ELECTROSTATIC SEPARATORS |
US4339782A (en) * | 1980-03-27 | 1982-07-13 | The Bahnson Company | Supersonic jet ionizer |
US4533368A (en) * | 1982-09-30 | 1985-08-06 | Black & Decker, Inc. | Apparatus for removing respirable aerosols from air |
US4693733A (en) * | 1986-09-09 | 1987-09-15 | Kankyo Company Limited | Air cleaner |
US4969328A (en) * | 1986-10-21 | 1990-11-13 | Kammel Refaat A | Diesel engine exhaust oxidizer |
USRE33927E (en) * | 1985-11-08 | 1992-05-19 | Kankyo Company Limited | Air cleaner |
US5268009A (en) * | 1992-12-22 | 1993-12-07 | Teledyne Industries, Inc. | Portable air filter system |
WO1998022222A1 (en) * | 1996-11-21 | 1998-05-28 | Blue Air Ab | Device in connection with an electrostatic filter |
US20040129140A1 (en) * | 2002-12-23 | 2004-07-08 | Samsung Electronics Co., Ltd. | Dust collecting apparatus for an air conditioner |
US6805732B1 (en) * | 1999-11-23 | 2004-10-19 | Airinspace Ltd. | Electrostatic treatment of aerosols, devices and method for producing same |
US7025806B2 (en) * | 2003-11-25 | 2006-04-11 | Stri{dot over (o)}nAir, Inc. | Electrically enhanced air filtration with improved efficacy |
US20070137486A1 (en) * | 2005-12-17 | 2007-06-21 | Airinspace Limited | Electrostatic filter |
US7258729B1 (en) * | 2004-08-04 | 2007-08-21 | Air Ion Devices Inc. | Electronic bi-polar electrostatic air cleaner |
US20110056372A1 (en) * | 2009-09-04 | 2011-03-10 | Rutgers, The State University Of New Jersey | Electrostatic screen device and method for emission control |
US20120186233A1 (en) * | 2009-09-14 | 2012-07-26 | Emitec Gesellschaft Fuer Emissionstechnologie Mbh | Device and method for treating exhaust gas containing soot particles and motor vehicle having the device and carrying out the method |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2297601A (en) * | 1940-09-03 | 1942-09-29 | American Air Filter Co | Electric gas cleaner |
US2579441A (en) * | 1950-02-25 | 1951-12-18 | Westinghouse Electric Corp | Electrostatic precipitator |
US2579445A (en) * | 1949-01-28 | 1951-12-18 | Westinghouse Electric Corp | Electrostatic precipitator |
-
1955
- 1955-08-30 US US531416A patent/US2822058A/en not_active Expired - Lifetime
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2297601A (en) * | 1940-09-03 | 1942-09-29 | American Air Filter Co | Electric gas cleaner |
US2579445A (en) * | 1949-01-28 | 1951-12-18 | Westinghouse Electric Corp | Electrostatic precipitator |
US2579441A (en) * | 1950-02-25 | 1951-12-18 | Westinghouse Electric Corp | Electrostatic precipitator |
Cited By (30)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2973054A (en) * | 1956-02-15 | 1961-02-28 | Philco Corp | Gas cleaning unit |
US3201620A (en) * | 1959-12-21 | 1965-08-17 | Earle W Balientine | Triboelectric generator for ionizing air |
US3073094A (en) * | 1960-05-23 | 1963-01-15 | Trion Inc | Electrostatic filter panel |
US3400513A (en) * | 1966-09-08 | 1968-09-10 | Babcock & Wilcox Co | Electrostatic precipitator |
US3520110A (en) * | 1966-12-19 | 1970-07-14 | Hughes Aircraft Co | Electrical isolator for gas feed line |
US3495379A (en) * | 1967-07-28 | 1970-02-17 | Cottrell Res Inc | Discharge electrode configuration |
US3763633A (en) * | 1971-02-09 | 1973-10-09 | C Soltis | Electrostatic air filter |
US3800509A (en) * | 1972-02-14 | 1974-04-02 | Carrier Corp | Electrostatic precipitator |
DE2622934A1 (en) * | 1975-05-22 | 1976-12-09 | Dart Ind Inc | COLLECTOR ELECTRODES FOR ELECTROSTATIC SEPARATORS |
US4339782A (en) * | 1980-03-27 | 1982-07-13 | The Bahnson Company | Supersonic jet ionizer |
US4533368A (en) * | 1982-09-30 | 1985-08-06 | Black & Decker, Inc. | Apparatus for removing respirable aerosols from air |
USRE33927E (en) * | 1985-11-08 | 1992-05-19 | Kankyo Company Limited | Air cleaner |
US4693733A (en) * | 1986-09-09 | 1987-09-15 | Kankyo Company Limited | Air cleaner |
US4969328A (en) * | 1986-10-21 | 1990-11-13 | Kammel Refaat A | Diesel engine exhaust oxidizer |
US5097665A (en) * | 1988-11-01 | 1992-03-24 | Kammel Refaat A | Flattened profile diesel engine exhaust oxidizer |
US5268009A (en) * | 1992-12-22 | 1993-12-07 | Teledyne Industries, Inc. | Portable air filter system |
WO1998022222A1 (en) * | 1996-11-21 | 1998-05-28 | Blue Air Ab | Device in connection with an electrostatic filter |
US6805732B1 (en) * | 1999-11-23 | 2004-10-19 | Airinspace Ltd. | Electrostatic treatment of aerosols, devices and method for producing same |
US7029520B2 (en) * | 2002-12-23 | 2006-04-18 | Samsung Electronics Co., Ltd. | Dust collecting apparatus for an air conditioner |
US20040129140A1 (en) * | 2002-12-23 | 2004-07-08 | Samsung Electronics Co., Ltd. | Dust collecting apparatus for an air conditioner |
US7025806B2 (en) * | 2003-11-25 | 2006-04-11 | Stri{dot over (o)}nAir, Inc. | Electrically enhanced air filtration with improved efficacy |
US20060180023A1 (en) * | 2003-11-25 | 2006-08-17 | Rex Coppom | Electrically enhanced air filtration with improved efficacy |
US7513933B2 (en) * | 2003-11-25 | 2009-04-07 | Strionair, Inc. | Electrically enhanced air filtration with improved efficacy |
US7258729B1 (en) * | 2004-08-04 | 2007-08-21 | Air Ion Devices Inc. | Electronic bi-polar electrostatic air cleaner |
US20070137486A1 (en) * | 2005-12-17 | 2007-06-21 | Airinspace Limited | Electrostatic filter |
US7279028B2 (en) * | 2005-12-17 | 2007-10-09 | Airinspace B.V. | Electrostatic filter |
US20110056372A1 (en) * | 2009-09-04 | 2011-03-10 | Rutgers, The State University Of New Jersey | Electrostatic screen device and method for emission control |
US8721767B2 (en) * | 2009-09-04 | 2014-05-13 | Rutgers, The State University Of New Jersey | Electrostatic screen device and method for emission control |
US20120186233A1 (en) * | 2009-09-14 | 2012-07-26 | Emitec Gesellschaft Fuer Emissionstechnologie Mbh | Device and method for treating exhaust gas containing soot particles and motor vehicle having the device and carrying out the method |
US9010086B2 (en) * | 2009-09-14 | 2015-04-21 | Emitec Gesellschaft Fuer Emissionstechnologie Mbh | Device and method for treating exhaust gas containing soot particles and motor vehicle having the device and carrying out the method |
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