Connect public, paid and private patent data with Google Patents Public Datasets

Energizing electrical precipitator

Download PDF

Info

Publication number
US2509548A
US2509548A US2962348A US2509548A US 2509548 A US2509548 A US 2509548A US 2962348 A US2962348 A US 2962348A US 2509548 A US2509548 A US 2509548A
Authority
US
Grant status
Grant
Patent type
Prior art keywords
circuit
precipitator
pulse
condenser
including
Prior art date
Legal status (The legal status 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 status listed.)
Expired - Lifetime
Application number
Inventor
Harry J White
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Research Corp
Original Assignee
Research Corp
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
Grant date

Links

Images

Classifications

    • 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
    • B03C3/66Applications of electricity supply techniques

Description

ma 30, 1950 H. J, WHITE 2,509,548

ENERGIZING ELECTRICAL PRECIPITATOR Filed May 27, 1948 Patented May 30, 1950 ENERGIZIN G ELECTRICAL PRECIPITATOR Harry J. White, Lawrenceville, N. J., assignor to Research Corporation, New York, N. Y., a corporation of New York Application May 27, 1948, Serial No. 29,623

14 Claims.

The present invention relates to electric systems comprising an electrical precipitator for removing suspended particles from gases and a charging circuit for energizing the precipitator. In particular it relates to a charging circuit in which electrical power is supplied to an electrical precipitator in a series of evenly spaced, short duration current pulses of controlled characteristics, provision being made in the circuit for maintaining a supply of such power without interruption arising from the changeable and unpredictable load conditions which are commonly met with in electrical precipitators.

The usefulness of such a circuit depends to I large extent upon the overall efiiciency with which energy is transformed and transferred from one form to another and from one piece of equipment to another. This in turn depends upon the nature, relative rating, and arrangement of the equipment comprised in the circuit. It also depends upon the characteristics of the load, or loads, included in the system and the influence of the load upon the functioning of the energizing circuit.

An electrical precipitator for cleaning gases comprising spacially positioned and insulated complementary electrodes provides a very unpredictable electric load because, in its operation, mixtures of gas and suspended solid and/or liquid particles flow through the inter electrode spaces and these mixtures change in physical, chemical, and electrical characteristics due to changes at the origin of the mixtures, for instance, in the operating conditions in the furnace which may produce such mixtures. The gas may change in composition or temperature and the particles may change in composition, size, and concentration. At times of rapping the precipitator electrodes, the electrical conditions in the spaces between the electrodes, due to falling material, are greatly changed. Such changes alter the dielectric constant of the mixture, thus changing the capacitance of the precipitator; they bring about changes in the conductivity of the gases, and so change the electric power, due largely to corona discharges, required by the precipitator; and, without warning, spark-overs take place between the electrodes which temporarily short circuit the precipitator and initiate transients which will, unless prevented from doing so, travel back through the power supply circuit.

It is an object of the present invention to avoid these objectionable features and conditions by providing a high efficiency circuit for the production of unidirectional current pulses and supplying the unidirectional pulses to the complementary electrodes of a precipitator through a unidirectional current passing device, such as a diode or a metal oxide rectifier.

Preferably the pulse energy is generated at relatively low voltage thus reducing equipment and operating costs and making it possible to transfer the pulse energy under low voltage conditions to the immediate vicinit of the precipitator. At the precipitator, a pulse transformer is provided which steps up the voltage of the pulses but which changes them practically not at all, otherwise. These pulses then flow through a one-way current transfer means to the precipitator. The oneway means causes retention in the precipitator, for use therein, of all energy that reaches it. This makes for economical operation, suppresses transients, and provides conditions which permit the charging circuit to function in an orderly and desired manner. The duration and peak value of the pulses can be largely controlled, conditions which have much to do with the efiiciency of the operation of the precipitator. Use of a pulse transformer is not essential but is preferred in energizing precipitators at high potentials.

The term pulses is used herein to denote a succession of discrete increments of electrical energy separated by intervals of substantially greater duration than the duration of the increments of electrical energy.

Generally, the pulse charging system of the invention comprises a condenser, circuit elements including a series conductive impedance connecting a source of current to the condenser, circuit elements including a periodic circuit closing device, for example, a rotary gap switch, and an inductance connected in series with the condenser to provide a pulsing circuit, and circuit elements including a unidirectional current passing device connecting the pulsing circuit with complementary electrodes of an electrical precipitator. The pulse charging system may be energized with unidirectional current or with alternating current synchronous with the periodic circuit cl-osing device of the system.

The invention will be more particularly described with reference to the accompanying drawing in which Figs. 1 to 5 are diagrammatic representations of five different charging circuits embodying the principles of the invention.

In the various figures like elements are indicated by like reference numerals.

In the drawing circuit of Fig. 1, I!) is a source of unidirectional current, and II and I2 are the discharge electrodes and collecting electrodes of an electrical precipitator, I3 is an inductance,

I 4 a rotary gap switch, I5 a condenser, It an inductance, I I a pulse transformer and I8 a diode.

For the supply .of pulses at :a peak voltage of 60 kv. and a pulse rate of 240 :per second to an electrical precipitator of approximately 5,000 cubic feet per minute capacity, D. C. power supply I ll may provide D. 0. current at about .7200 volts. The following values of the circuit elements of Fig. 1 will provide the desired pulse energy at the precipitator:

Inductance I3: 43 h.

Rotary gap I4: 8 points, 11890 R. P. M. Condenser I5: 0.048 mf.; 15 kv. Inductance It: 17 mh.

Pulse transformer". I'I: ratio 4.7

Diode I8: Ei-macZBOR The- -provision of a condenser Lainshunt with the load is advantageous in providing further control of .the voltage characteristics of the charging pulses and particularly tor controllin the duration of potentials across "the electrodes of the :precipitator. The shunt condenser 49 is preferably much smaller :in capacity than the charging condenser 1-5 and may be decreased in size and capacity with increasing pulse freguency.

The .tunction of :coil 15 maybe-filled by the provision of sufficient inductive leakage in pulse transformer II.

The charging circuit-of Fig. '2 includes a synchronous rotary gap switch 2!! which functions a commutating switch to distribute the energizing pulses in cyclic succession to a plurality of electrical precipitators through loads 21, 22, ligand 24.

With a direct current supply Ill providing 1'3 kv., 1.8 Amp. direct current, the followingvalues ofrthe circuit elements will supply pulses of peak voltage 100 kv. at a ra-teof 480 per second prosliding -18 kw. for distribution to the tour electrical precipitators:

Inductance", I3: ,3 h.

Rotary gap I4: .8 points, 3600 R. P. M. Condenser it: 0.15 mf.; 25 kv. Inductance It: 19 mh.

Pulse transformer I1: Ratio 7 Rotary switch Z0: 8'points, 3600 RP. M.

In the charging'circuit of Fig. 3, the rotary gap'switch I4 and the condenser t5 are interchanged. In the circuit of Fig. 3, a damping circuit, comprising series res stance 25-and diode 2 5 connected across the primary terminals of the pulse transformer .I 1., is provided. Since the diode 26 conducts whenever the voltage across the primary winding of the transformer becomes posi tive any transient voltages, which might arise in theprimary .due to sparking in the precipitate:- or other operating variables, are rapidly attenuated.

Fig. 4 shows a charging circuit including a plurality ,of pulse condensers I'5a, I5b connected with D. C. power source Ill through inductance I3 and optional diode 28 and connected with inductances Iiia, I 6b and rotary gap switches I and 20 to be charged in parallel and discharged in series.

sible to vary the output frequency over a considerable range without changing the resonant frequency of the charging circuit including inductance I3 and capacity I5. A pulse transformer may be inserted in the circuit between inductance 2'! and diode I8 as in Figs. 1 to 3. The values of the circuit elements will be selected in accordance with the principles illustrated in the illustrative values given for Figs. 1 and 2 to provide the desiredpulse rate and peak voltage at the precipitator. The inductances Ilia and I 5b should be much greater than inductance 21, and inductance I 3 should be much greater than inductances Ida, I6b.

In the charging system of Fig. 5, alternating current from motor-generator set 29 is stepped up to the desired voltage by transformer 30.

"The'rotary gapzswitch I4 is driven in synchronism with the motor-generator set to close the pulsing circuit once each cycle when the A. C. voltage is zero. The pulse frequency will then be equal to the A. 0. frequency and if the charging choke I3 and pulse condenser I5 are selected to be series resonant with the A. 0. frequency the maximum pulse voltage will be 1rV, where V is the peak value of the A. C. voltage at the secondary of transformer .30.

If the transformer 33 is energized with line A. C. current, the rotary ap switch may bedriven by a synchronous motor actuated by the line power. The function of the charging choke I3 may be filled leakage inductance of transformer 38 if desired. I

It will be seen that the construction andvarrangement of the-charging systems "of the invention may be widely varied without departing from the principles of the invention.

By means of minor changes in the circuits a wide range of pulse frequencies, voltages and wave shapes can be provided, thus making it readily possible to adjust the energization of each precipitator installation to the particular condi-- tions involvedand obtain-increasedefiiciencyand smoothness of operation. 1

:Anu-mber of precipitators or precipitatorsections can be energized from a single charging circuit-by commutation arrangementsof the type shown in Fig. 2, without introducing any interaction of the precipitators with each-other.

By the introduction of a pulse transformer into the charging circuits all of the circuit voltages may be kept relatively low, for example of the order-of 5 kv. to 151W. for the direct current power supply and 10 kv. to 30 kv. for the pulsing circuit components. This makes it possible to locate the-direct current power supply and the pulse generating circuit at any convenient loca-- tion or locations, connections being made with relatively cheap power cable. The pulse transformer can be mounted close to or adjacent the precipitator and the high voltage output lead tied directly tothe precipitator by a short direct connection.

The pulse generating circuit of the invention has the advantage that short circuiting the pulse transformer, as would occur in the case of sparking in the precipitator, does not resultin any-increase in power, as contrasted with the usual precipitator energizing circuits which, when the precipitator sparks, draw heavy currents and power and .giver-iseto surges and electrode burning in the precipitator. These heavy sparking currents necessitate a large, power wasting, primary resistance in the high voltage transformer of ordinary energizing circuits in order to .pre-

vent excessive precipitator arcs and current surges on the power line. The circuits of the invention require no such power wasting resistor, nor can any ordinary amount of precipitator sparking be harmful, although excess sparking is undesirable as it reduces precipitator efficiency.

This application is a continuation-in-part of my application Serial No. 774,142 filed September 15, 1947 and now abandoned.

I claim:

1. A charging system for an electrical precipitator comprising a condenser, circuit elements including a series conductive impedance means connecting a source of current to said condenser, circuit elements including a periodic circuit closing device and an inductance means connected in series with said condenser to provide a pulsing circuit, and circuit elements including a unidirectional current passing device connecting said pulsing circuit with the complementary electrodes of a precipitator.

2. A charging system for an electrical precipitator comprising a condenser, circuit elements including a series inductance means connecting a source of current to said condenser, circuit elements including a periodic circuit closing device and an inductance means connected in series with said condenser to provide a pulsing circuit, and circuit elements including a unidirectional current passing device connecting said pulsing circuit with the complementary electrodes of a precipitator.

3. A pulse charging system for an electrical precipitator comprising a condenser, circuit elements including a series inductance means con necting a source of unidirectional current to said condenser, circuit elements including a periodic circuit closing device and an inductance means connected in series with said condenser to provide a pulsing circuit, and circuit elements including a unidirectional current passing device connecting said pulsing circuit with the complementary electrodes of a precipitator,

4. A charging system for an electrical precipitator comprising a condenser, circuit elements including a series conductive impedance means connecting a source of current to said condenser, circuit elements including a periodic circuit closing device and an inductance means connected in series with said condenser to provide a pulsing circuit, and circuit elements including a unidirectional current passing device and a shunt capacity means connecting said pulsing circuit with the complementary electrodes of a precipitator.

5. A charging system for an electrical precipitator comprising a condenser, circuit elements including a series inductance means connecting a source of unidirectional current to said condenser, circuit elements including a periodic circuit closing device and an inductance means connected in series with said condenser to provide a pulsing circuit, and circuit elements including a pulse transformer and a unidirectional current passing device connecting said pulsing circuit with the complementary electrodes of a precipitator.

6. A charging system for an electrical precipitator comprising a condenser, circuit elements including a series conductive impedance means connecting a source of unidirectional current to said condenser, and circuit elements including a periodic circuit closing device, an inductance means and a unidirectional current passing device connecting .said condenser with the complementary electrodes of a precipitator.

7. A charging system as defined in claim 6 wherein the circuit elements connecting the condenser with the complementary electrodes of the precipitator include an inductive coupler.

8. A charging system for an electrical precipitator comprising a pulse transformer, a pulsing circuit including a condenser, an inductance means and a periodic circuit closing device in series with the primary of the pulse transformer, circuit elements including a series impedance means connecting a source of unidirectional electric current to said condenser, and circuit elements including a unidirectional current passing device connecting the secondary of the pulse transformer to the complementary electrodes of the precipitator.

9. A charging system for an electrical precipitator comprising a pulse transformer, a pulsing circuit including a condenser, an inductance means and a periodic circuit closing device in series with the primary of the pulse transformer, circuit elements including a series inductance means connecting a source of unidirectional electric current to said condenser, and circuit elements including a unidirectional current passing device connecting the secondary of the pulse transformer to the complementary electrodes of the precipitator.

10. A charging system for an electrical precipitator comprising a pulse transformer, a pulsing circuit including a condenser, an inductance means and a multiple rotary switch in series with the primary of the pulse transformer, circuit elements including a series impedance means connecting a source of unidirectional electric current to said condenser, and circuit elements including a unidirectional current passing device connecting the secondary of the pulse transformer to the complementary electrodes of the precipitator.

11. A charging system for an electrical precipitator comprising a pulse transformer, a pulsing circuit including a condenser, an inductance means and a periodic circuit closing device in series with the primary of the pulse transformer, circuit elements including a series impedance means connecting a source of unidirectional electric current to said condenser, and circuit elements including a diode connecting the secondary of the pulse transformer to the complementary electrode of the precipitator.

12. A charging system for an electrical precipitator comprising a condenser, circuit elements including a series conductive impedance means and a unidirectional current passing device connecting a source of current to said condenser, circuit elements including a periodic circuit closing device and an inductance means connected in series with said condenser to provide a pulsing circuit, and circuit elements including a unidirectional current passing device connecting said pulsing circuit with the complementary electrodes of a precipitator.

13. A charging system for an electrical precipitator comprising a pulse transformer, a closed pulsing circuit including a condenser and a periodic circuit closing device connected in series with the primary of the pulse transformer, circuit elements including a series inductance means connecting a source of unidirectional electric current directly to said condenser to form a second closed circuit, and circuit elements including a unidirectional current passing device connecting the secondary of the pulse transformer to the complementary electrodes of the precipitator.

means 14. A charging-r system for an. electrical precipitator comprising, a pulse; transformer, a closedpulsing circuit including a condenser, an inductance means and a periodic circuit. closing device connected in series with the primary of the pulse transformer, circuit elements including a series inductance means connecting a source of unidirectional electric current directly to said, condenser to form a second closed circuit, circuit elements including a. unidirectional current passing. device connecting the secondary of the pulse transformer to the complementary electrodes of the precipitator, and a damping circuit including a unidirectional current passing device and a series resistor connected in shunt with the 15 primary of the pulse transformer. v

HARRY J. WHITE.

REFERENCES CITED The following references are of record in the file of this. patent:

UNITED STATES PATENTS

US2509548A 1948-05-27 1948-05-27 Energizing electrical precipitator Expired - Lifetime US2509548A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
US2509548A US2509548A (en) 1948-05-27 1948-05-27 Energizing electrical precipitator

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US2509548A US2509548A (en) 1948-05-27 1948-05-27 Energizing electrical precipitator

Publications (1)

Publication Number Publication Date
US2509548A true US2509548A (en) 1950-05-30

Family

ID=21849998

Family Applications (1)

Application Number Title Priority Date Filing Date
US2509548A Expired - Lifetime US2509548A (en) 1948-05-27 1948-05-27 Energizing electrical precipitator

Country Status (1)

Country Link
US (1) US2509548A (en)

Cited By (48)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3443361A (en) * 1965-06-11 1969-05-13 Koppers Co Inc Automatic precipitator voltage control
US3443358A (en) * 1965-06-11 1969-05-13 Koppers Co Inc Precipitator voltage control
US3641740A (en) * 1969-07-09 1972-02-15 Belco Pollution Control Corp Pulse-operated electrostatic precipitator
US3973933A (en) * 1973-08-14 1976-08-10 Senichi Masuda Particle charging device and an electric dust collecting apparatus
US3980455A (en) * 1973-08-14 1976-09-14 Senichi Masuda Particle charging device and an electric dust collecting apparatus making use of said device
US3981695A (en) * 1972-11-02 1976-09-21 Heinrich Fuchs Electronic dust separator system
US4018577A (en) * 1973-04-23 1977-04-19 Ishikawajima-Harima Jukogyo Kabushiki Kaisha Particle charging device for use in an electric dust collecting apparatus
US4094653A (en) * 1973-08-14 1978-06-13 Senichi Masuda Particle charging device and an electric dust collecting apparatus making use of said device
US4133649A (en) * 1975-09-02 1979-01-09 High Voltage Engineering Corporation Reduced power input for improved electrostatic precipitation systems
US4695358A (en) * 1985-11-08 1987-09-22 Florida State University Method of removing SO2, NOX and particles from gas mixtures using streamer corona
US6221136B1 (en) 1998-11-25 2001-04-24 Msp Corporation Compact electrostatic precipitator for droplet aerosol collection
US6362604B1 (en) 1998-09-28 2002-03-26 Alpha-Omega Power Technologies, L.L.C. Electrostatic precipitator slow pulse generating circuit
US20020098131A1 (en) * 1998-11-05 2002-07-25 Sharper Image Corporation Electro-kinetic air transporter-conditioner device with enhanced cleaning features
US20020127156A1 (en) * 1998-11-05 2002-09-12 Taylor Charles E. Electro-kinetic air transporter-conditioner devices with enhanced collector electrode
US20020134665A1 (en) * 1998-11-05 2002-09-26 Taylor Charles E. Electro-kinetic air transporter-conditioner devices with trailing electrode
US20020146356A1 (en) * 1998-11-05 2002-10-10 Sinaiko Robert J. Dual input and outlet electrostatic air transporter-conditioner
US20020155041A1 (en) * 1998-11-05 2002-10-24 Mckinney Edward C. Electro-kinetic air transporter-conditioner with non-equidistant collector electrodes
US20030072697A1 (en) * 2001-01-29 2003-04-17 Sharper Image Corporation Apparatus for conditioning air
US20030170150A1 (en) * 1998-11-05 2003-09-11 Sharper Image Corporation Electrode self-cleaning mechanism for electro-kinetic air transporter-conditioner devices
US20030206840A1 (en) * 1998-11-05 2003-11-06 Taylor Charles E. Electro-kinetic air transporter and conditioner device with enhanced housing configuration and enhanced anti-microorganism capability
US20030206839A1 (en) * 1998-11-05 2003-11-06 Taylor Charles E. Electro-kinetic air transporter and conditioner device with enhanced anti-microorganism capability
US20030206837A1 (en) * 1998-11-05 2003-11-06 Taylor Charles E. Electro-kinetic air transporter and conditioner device with enhanced maintenance features and enhanced anti-microorganism capability
US20030233935A1 (en) * 2002-06-20 2003-12-25 Reeves John Paul Electrode self-cleaning mechanism for electro-kinetic air transporter-conditioner devices
US20040047775A1 (en) * 1998-11-05 2004-03-11 Sharper Image Corporation Personal electro-kinetic air transporter-conditioner
US20040251124A1 (en) * 2003-06-12 2004-12-16 Sharper Image Corporation Electro-kinetic air transporter and conditioner devices with features that compensate for variations in line voltage
US20050061152A1 (en) * 2003-09-23 2005-03-24 Msp Corporation Electrostatic precipitator for diesel blow-by
US20050061344A1 (en) * 1998-09-29 2005-03-24 Sharper Image Corporation Ion emitting brush
US20050082160A1 (en) * 2003-10-15 2005-04-21 Sharper Image Corporation Electro-kinetic air transporter and conditioner devices with a mesh collector electrode
US20050146712A1 (en) * 2003-12-24 2005-07-07 Lynx Photonics Networks Inc. Circuit, system and method for optical switch status monitoring
US20050160906A1 (en) * 2002-06-20 2005-07-28 The Sharper Image Electrode self-cleaning mechanism for air conditioner devices
US7077890B2 (en) 2003-09-05 2006-07-18 Sharper Image Corporation Electrostatic precipitators with insulated driver electrodes
US7220295B2 (en) 2003-05-14 2007-05-22 Sharper Image Corporation Electrode self-cleaning mechanisms with anti-arc guard for electro-kinetic air transporter-conditioner devices
US7285155B2 (en) 2004-07-23 2007-10-23 Taylor Charles E Air conditioner device with enhanced ion output production features
US7291207B2 (en) 2004-07-23 2007-11-06 Sharper Image Corporation Air treatment apparatus with attachable grill
US7311762B2 (en) 2004-07-23 2007-12-25 Sharper Image Corporation Air conditioner device with a removable driver electrode
US7318856B2 (en) 1998-11-05 2008-01-15 Sharper Image Corporation Air treatment apparatus having an electrode extending along an axis which is substantially perpendicular to an air flow path
US7405672B2 (en) 2003-04-09 2008-07-29 Sharper Image Corp. Air treatment device having a sensor
US7517505B2 (en) 2003-09-05 2009-04-14 Sharper Image Acquisition Llc Electro-kinetic air transporter and conditioner devices with 3/2 configuration having driver electrodes
US7517503B2 (en) 2004-03-02 2009-04-14 Sharper Image Acquisition Llc Electro-kinetic air transporter and conditioner devices including pin-ring electrode configurations with driver electrode
US20090277775A1 (en) * 2005-12-14 2009-11-12 Metsa Janet C Reactor for removing chemical and biological contaminants from a contaminated fluid
US7638104B2 (en) 2004-03-02 2009-12-29 Sharper Image Acquisition Llc Air conditioner device including pin-ring electrode configurations with driver electrode
US7724492B2 (en) 2003-09-05 2010-05-25 Tessera, Inc. Emitter electrode having a strip shape
US7767169B2 (en) 2003-12-11 2010-08-03 Sharper Image Acquisition Llc Electro-kinetic air transporter-conditioner system and method to oxidize volatile organic compounds
US7833322B2 (en) 2006-02-28 2010-11-16 Sharper Image Acquisition Llc Air treatment apparatus having a voltage control device responsive to current sensing
US7906080B1 (en) 2003-09-05 2011-03-15 Sharper Image Acquisition Llc Air treatment apparatus having a liquid holder and a bipolar ionization device
US8043573B2 (en) 2004-02-18 2011-10-25 Tessera, Inc. Electro-kinetic air transporter with mechanism for emitter electrode travel past cleaning member
US20160130162A1 (en) * 2014-11-06 2016-05-12 Hoseo University Academic Cooperation Foundation Water treatment device using high voltage impulse
DE102005021220B4 (en) * 2004-05-28 2017-03-02 Cummins Filtration Ip, Inc. An electrostatic precipitator with pulsed high-voltage power supply

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1120561A (en) * 1913-02-11 1914-12-08 R B Mellon Art of separating finely-divided particles of solids or liquids from a gas.
US1433699A (en) * 1918-12-14 1922-10-31 Westinghouse Electric & Mfg Co Electrical precipitating system
GB350205A (en) * 1930-05-21 1931-06-11 Lodge Cottrell Ltd Method of and means for obtaining high-tension unidirectional current
DE537101C (en) * 1931-10-30 Lurgi Appbau Ges M B H Method for current limiting in electric plants gas purifier
DE551416C (en) * 1925-05-02 1932-05-31 Lurgi Appbau Ges M B H Method for current limitation during operation of electrical gas purifier
US2000020A (en) * 1931-06-02 1935-05-07 Int Precipitation Co Method of electrical precipitation of suspended particles from gases
US2000017A (en) * 1930-04-05 1935-05-07 Siemens Ag Electrical cleaning of fluids

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE537101C (en) * 1931-10-30 Lurgi Appbau Ges M B H Method for current limiting in electric plants gas purifier
US1120561A (en) * 1913-02-11 1914-12-08 R B Mellon Art of separating finely-divided particles of solids or liquids from a gas.
US1433699A (en) * 1918-12-14 1922-10-31 Westinghouse Electric & Mfg Co Electrical precipitating system
DE551416C (en) * 1925-05-02 1932-05-31 Lurgi Appbau Ges M B H Method for current limitation during operation of electrical gas purifier
US2000017A (en) * 1930-04-05 1935-05-07 Siemens Ag Electrical cleaning of fluids
GB350205A (en) * 1930-05-21 1931-06-11 Lodge Cottrell Ltd Method of and means for obtaining high-tension unidirectional current
US2000020A (en) * 1931-06-02 1935-05-07 Int Precipitation Co Method of electrical precipitation of suspended particles from gases

Cited By (87)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3443358A (en) * 1965-06-11 1969-05-13 Koppers Co Inc Precipitator voltage control
US3443361A (en) * 1965-06-11 1969-05-13 Koppers Co Inc Automatic precipitator voltage control
US3641740A (en) * 1969-07-09 1972-02-15 Belco Pollution Control Corp Pulse-operated electrostatic precipitator
US3981695A (en) * 1972-11-02 1976-09-21 Heinrich Fuchs Electronic dust separator system
US4018577A (en) * 1973-04-23 1977-04-19 Ishikawajima-Harima Jukogyo Kabushiki Kaisha Particle charging device for use in an electric dust collecting apparatus
US3973933A (en) * 1973-08-14 1976-08-10 Senichi Masuda Particle charging device and an electric dust collecting apparatus
US3980455A (en) * 1973-08-14 1976-09-14 Senichi Masuda Particle charging device and an electric dust collecting apparatus making use of said device
US4094653A (en) * 1973-08-14 1978-06-13 Senichi Masuda Particle charging device and an electric dust collecting apparatus making use of said device
US4133649A (en) * 1975-09-02 1979-01-09 High Voltage Engineering Corporation Reduced power input for improved electrostatic precipitation systems
US4695358A (en) * 1985-11-08 1987-09-22 Florida State University Method of removing SO2, NOX and particles from gas mixtures using streamer corona
US6362604B1 (en) 1998-09-28 2002-03-26 Alpha-Omega Power Technologies, L.L.C. Electrostatic precipitator slow pulse generating circuit
US20050061344A1 (en) * 1998-09-29 2005-03-24 Sharper Image Corporation Ion emitting brush
US20030170150A1 (en) * 1998-11-05 2003-09-11 Sharper Image Corporation Electrode self-cleaning mechanism for electro-kinetic air transporter-conditioner devices
US20020098131A1 (en) * 1998-11-05 2002-07-25 Sharper Image Corporation Electro-kinetic air transporter-conditioner device with enhanced cleaning features
US20020127156A1 (en) * 1998-11-05 2002-09-12 Taylor Charles E. Electro-kinetic air transporter-conditioner devices with enhanced collector electrode
US20020134665A1 (en) * 1998-11-05 2002-09-26 Taylor Charles E. Electro-kinetic air transporter-conditioner devices with trailing electrode
US7662348B2 (en) 1998-11-05 2010-02-16 Sharper Image Acquistion LLC Air conditioner devices
US20020155041A1 (en) * 1998-11-05 2002-10-24 Mckinney Edward C. Electro-kinetic air transporter-conditioner with non-equidistant collector electrodes
US7695690B2 (en) 1998-11-05 2010-04-13 Tessera, Inc. Air treatment apparatus having multiple downstream electrodes
US7767165B2 (en) 1998-11-05 2010-08-03 Sharper Image Acquisition Llc Personal electro-kinetic air transporter-conditioner
US7097695B2 (en) 1998-11-05 2006-08-29 Sharper Image Corporation Ion emitting air-conditioning devices with electrode cleaning features
USRE41812E1 (en) 1998-11-05 2010-10-12 Sharper Image Acquisition Llc Electro-kinetic air transporter-conditioner
US7318856B2 (en) 1998-11-05 2008-01-15 Sharper Image Corporation Air treatment apparatus having an electrode extending along an axis which is substantially perpendicular to an air flow path
US20030206840A1 (en) * 1998-11-05 2003-11-06 Taylor Charles E. Electro-kinetic air transporter and conditioner device with enhanced housing configuration and enhanced anti-microorganism capability
US20030206839A1 (en) * 1998-11-05 2003-11-06 Taylor Charles E. Electro-kinetic air transporter and conditioner device with enhanced anti-microorganism capability
US20030206837A1 (en) * 1998-11-05 2003-11-06 Taylor Charles E. Electro-kinetic air transporter and conditioner device with enhanced maintenance features and enhanced anti-microorganism capability
US20030209420A1 (en) * 1998-11-05 2003-11-13 Sharper Image Corporation Electro-kinetic air transporter and conditioner devices with special detectors and indicators
US7959869B2 (en) 1998-11-05 2011-06-14 Sharper Image Acquisition Llc Air treatment apparatus with a circuit operable to sense arcing
US20040003721A1 (en) * 1998-11-05 2004-01-08 Sharper Image Corporation Electrode self-cleaning mechanism for electro-kinetic air transporter-conditioner devices
US20040047775A1 (en) * 1998-11-05 2004-03-11 Sharper Image Corporation Personal electro-kinetic air transporter-conditioner
US6709484B2 (en) 1998-11-05 2004-03-23 Sharper Image Corporation Electrode self-cleaning mechanism for electro-kinetic air transporter conditioner devices
US20040057882A1 (en) * 1998-11-05 2004-03-25 Sharper Image Corporation Ion emitting air-conditioning devices with electrode cleaning features
US6713026B2 (en) 1998-11-05 2004-03-30 Sharper Image Corporation Electro-kinetic air transporter-conditioner
US6974560B2 (en) 1998-11-05 2005-12-13 Sharper Image Corporation Electro-kinetic air transporter and conditioner device with enhanced anti-microorganism capability
US20040179981A1 (en) * 1998-11-05 2004-09-16 Sharper Image Corporation Electrode cleaning for air conditioner devices
US20040191134A1 (en) * 1998-11-05 2004-09-30 Sharper Image Corporation Air conditioner devices
US20040234431A1 (en) * 1998-11-05 2004-11-25 Sharper Image Corporation Electro-kinetic air transporter-conditioner devices with trailing electrode
US6972057B2 (en) 1998-11-05 2005-12-06 Sharper Image Corporation Electrode cleaning for air conditioner devices
US6953556B2 (en) 1998-11-05 2005-10-11 Sharper Image Corporation Air conditioner devices
US20050147545A1 (en) * 1998-11-05 2005-07-07 Sharper Image Corporation Personal electro-kinetic air transporter-conditioner
US20050000793A1 (en) * 1998-11-05 2005-01-06 Sharper Image Corporation Air conditioner device with trailing electrode
US8425658B2 (en) 1998-11-05 2013-04-23 Tessera, Inc. Electrode cleaning in an electro-kinetic air mover
US6911186B2 (en) 1998-11-05 2005-06-28 Sharper Image Corporation Electro-kinetic air transporter and conditioner device with enhanced housing configuration and enhanced anti-microorganism capability
US7976615B2 (en) 1998-11-05 2011-07-12 Tessera, Inc. Electro-kinetic air mover with upstream focus electrode surfaces
US6896853B2 (en) 1998-11-05 2005-05-24 Sharper Image Corporation Personal electro-kinetic air transporter-conditioner
US20020146356A1 (en) * 1998-11-05 2002-10-10 Sinaiko Robert J. Dual input and outlet electrostatic air transporter-conditioner
US7404935B2 (en) 1998-11-05 2008-07-29 Sharper Image Corp Air treatment apparatus having an electrode cleaning element
US6221136B1 (en) 1998-11-25 2001-04-24 Msp Corporation Compact electrostatic precipitator for droplet aerosol collection
US6364941B2 (en) 1998-11-25 2002-04-02 Msp Corporation Compact high efficiency electrostatic precipitator for droplet aerosol collection
US6527821B2 (en) 1998-11-25 2003-03-04 Msp Corporation Automatic condensed oil remover
US7517504B2 (en) 2001-01-29 2009-04-14 Taylor Charles E Air transporter-conditioner device with tubular electrode configurations
US20030072697A1 (en) * 2001-01-29 2003-04-17 Sharper Image Corporation Apparatus for conditioning air
US20030147783A1 (en) * 2001-01-29 2003-08-07 Taylor Charles E. Apparatuses for conditioning air with means to extend exposure time to anti-microorganism lamp
US20030165410A1 (en) * 2001-01-29 2003-09-04 Taylor Charles E. Personal air transporter-conditioner devices with anti -microorganism capability
US7056370B2 (en) 2002-06-20 2006-06-06 Sharper Image Corporation Electrode self-cleaning mechanism for air conditioner devices
US20030233935A1 (en) * 2002-06-20 2003-12-25 Reeves John Paul Electrode self-cleaning mechanism for electro-kinetic air transporter-conditioner devices
US6749667B2 (en) 2002-06-20 2004-06-15 Sharper Image Corporation Electrode self-cleaning mechanism for electro-kinetic air transporter-conditioner devices
US20040237787A1 (en) * 2002-06-20 2004-12-02 Sharper Image Corporation Electrode self-cleaning mechanism for air conditioner devices
US20050160906A1 (en) * 2002-06-20 2005-07-28 The Sharper Image Electrode self-cleaning mechanism for air conditioner devices
US6908501B2 (en) 2002-06-20 2005-06-21 Sharper Image Corporation Electrode self-cleaning mechanism for air conditioner devices
US7405672B2 (en) 2003-04-09 2008-07-29 Sharper Image Corp. Air treatment device having a sensor
US7220295B2 (en) 2003-05-14 2007-05-22 Sharper Image Corporation Electrode self-cleaning mechanisms with anti-arc guard for electro-kinetic air transporter-conditioner devices
US20040251124A1 (en) * 2003-06-12 2004-12-16 Sharper Image Corporation Electro-kinetic air transporter and conditioner devices with features that compensate for variations in line voltage
US20040251909A1 (en) * 2003-06-12 2004-12-16 Sharper Image Corporation Electro-kinetic air transporter and conditioner devices with enhanced arching detection and suppression features
US7371354B2 (en) 2003-06-12 2008-05-13 Sharper Image Corporation Treatment apparatus operable to adjust output based on variations in incoming voltage
US6984987B2 (en) 2003-06-12 2006-01-10 Sharper Image Corporation Electro-kinetic air transporter and conditioner devices with enhanced arching detection and suppression features
US7724492B2 (en) 2003-09-05 2010-05-25 Tessera, Inc. Emitter electrode having a strip shape
US7906080B1 (en) 2003-09-05 2011-03-15 Sharper Image Acquisition Llc Air treatment apparatus having a liquid holder and a bipolar ionization device
US7077890B2 (en) 2003-09-05 2006-07-18 Sharper Image Corporation Electrostatic precipitators with insulated driver electrodes
US7517505B2 (en) 2003-09-05 2009-04-14 Sharper Image Acquisition Llc Electro-kinetic air transporter and conditioner devices with 3/2 configuration having driver electrodes
US20050061152A1 (en) * 2003-09-23 2005-03-24 Msp Corporation Electrostatic precipitator for diesel blow-by
US7267711B2 (en) 2003-09-23 2007-09-11 Msp Corporation Electrostatic precipitator for diesel blow-by
US20050082160A1 (en) * 2003-10-15 2005-04-21 Sharper Image Corporation Electro-kinetic air transporter and conditioner devices with a mesh collector electrode
US7767169B2 (en) 2003-12-11 2010-08-03 Sharper Image Acquisition Llc Electro-kinetic air transporter-conditioner system and method to oxidize volatile organic compounds
US20050146712A1 (en) * 2003-12-24 2005-07-07 Lynx Photonics Networks Inc. Circuit, system and method for optical switch status monitoring
US8043573B2 (en) 2004-02-18 2011-10-25 Tessera, Inc. Electro-kinetic air transporter with mechanism for emitter electrode travel past cleaning member
US7638104B2 (en) 2004-03-02 2009-12-29 Sharper Image Acquisition Llc Air conditioner device including pin-ring electrode configurations with driver electrode
US7517503B2 (en) 2004-03-02 2009-04-14 Sharper Image Acquisition Llc Electro-kinetic air transporter and conditioner devices including pin-ring electrode configurations with driver electrode
DE102005021220B4 (en) * 2004-05-28 2017-03-02 Cummins Filtration Ip, Inc. An electrostatic precipitator with pulsed high-voltage power supply
US7285155B2 (en) 2004-07-23 2007-10-23 Taylor Charles E Air conditioner device with enhanced ion output production features
US7311762B2 (en) 2004-07-23 2007-12-25 Sharper Image Corporation Air conditioner device with a removable driver electrode
US7897118B2 (en) 2004-07-23 2011-03-01 Sharper Image Acquisition Llc Air conditioner device with removable driver electrodes
US7291207B2 (en) 2004-07-23 2007-11-06 Sharper Image Corporation Air treatment apparatus with attachable grill
US20090277775A1 (en) * 2005-12-14 2009-11-12 Metsa Janet C Reactor for removing chemical and biological contaminants from a contaminated fluid
US7628927B2 (en) 2005-12-14 2009-12-08 Vesitech, Inc. Reactor for removing chemical and biological contaminants from a contaminated fluid
US7833322B2 (en) 2006-02-28 2010-11-16 Sharper Image Acquisition Llc Air treatment apparatus having a voltage control device responsive to current sensing
US20160130162A1 (en) * 2014-11-06 2016-05-12 Hoseo University Academic Cooperation Foundation Water treatment device using high voltage impulse

Similar Documents

Publication Publication Date Title
US3335291A (en) Zero voltage switching circuit using gate controlled conducting devices
US3493718A (en) Semi-conductor welding circuit
US3363143A (en) Alternating current switching power contact with soft start and circuit protection
US3265930A (en) Current level switching apparatus for operating electric discharge lamps
US3152295A (en) Pulsed tank circuit magneto-or electrostrictive device excitation
US3100851A (en) High power synthetic waveform generator
US3450942A (en) Electrical pulse generating system
US3507096A (en) Method and apparatus for automatic voltage control of electrostatic precipitators
US3641740A (en) Pulse-operated electrostatic precipitator
US3525035A (en) Closed loop ferroresonant voltage regulator which simulates core saturation
US4592763A (en) Method and apparatus for ramped pulsed burst powering of electrostatic precipitators
US4060752A (en) Discharge lamp auxiliary circuit with dI/dt switching control
US3075136A (en) Variable pulse width parallel inverters
US3169212A (en) Transistorized ignition system
US3984215A (en) Electrostatic precipitator and method
US3235769A (en) Starting circuit for discharge lamps
US3638087A (en) Gated power supply for sonic cleaners
US3569819A (en) Recovery system for short circuits through switching devices in power circuits
US3621363A (en) An arrangement for premagnetizing a static dc converter
US3849670A (en) Scr commutation circuit for current pulse generators
US4386395A (en) Power supply for electrostatic apparatus
US3330933A (en) Controlled rectifier welding power source
US4017784A (en) DC to DC converter
US3375428A (en) Regulated rectifier circuit
US3728516A (en) Welding power source