WO1999065608A1 - Method and device for generating voltage peaks in an electrostatic precipitator - Google Patents
Method and device for generating voltage peaks in an electrostatic precipitator Download PDFInfo
- Publication number
- WO1999065608A1 WO1999065608A1 PCT/SE1999/001104 SE9901104W WO9965608A1 WO 1999065608 A1 WO1999065608 A1 WO 1999065608A1 SE 9901104 W SE9901104 W SE 9901104W WO 9965608 A1 WO9965608 A1 WO 9965608A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- precipitator
- pulses
- voltage
- current
- rectifying
- Prior art date
Links
Classifications
-
- 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
- B03C3/34—Constructional details or accessories or operation thereof
- B03C3/66—Applications of electricity supply techniques
- B03C3/68—Control systems therefor
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10S323/00—Electricity: power supply or regulation systems
- Y10S323/903—Precipitators
Definitions
- an electrostatic precipitator makes use of electrostatic forces to separate dust particles from a gas.
- this is effected in the following manner: the gas is led into a chamber which contains vertical metal curtains which divide the chamber into a number of parallel gas passages.
- a frame Arranged centrally in each passage is a frame with electrodes arranged in it, which can often consist of wires. All the frames are interconnected, and form a continuous framework.
- the entire framework is suspended in supporting insulators, which results in the framework being electrically insulated from the other parts of the precipitator.
- US Patent 4,648,887 shows a method for controlling electrostatic precipitators.
- the method shown in this document comprises generating voltage pulse-trains to an electrostatic precipitator by means of current pulses, with the pulses of each voltage pulse-train comprising a number of sub-pulses.
- a drawback of this method is that each voltage sub-pulse corresponds on a one-to-one basis to a current pulse.
- the current pulses come from rectified AC from an ordinary AC-source. The time between the current pulses and thus between the voltage sub-pulses is thus determined by the frequency of the AC-source used, and cannot be varied.
- the first rectifying means in the device according to the invention additionally comprises means for rectifying and smoothing the AC from the power supply into DC in a first step, means for converting and transforming the DC from said first step into high-frequency AC, and means for rectifying said high- frequency AC into corresponding DC-pulses.
- the device according to the invention may additionally comprise means for varying the number of DC-pulses in each DC-pulse group to the precipitator, to reach the desired value of each voltage peak.
- the device according to the invention is provided with means for generating voltage peaks which increase with a derivative which exceeds 30 kV/ms.
- Fig. 2 shows a block diagram of a device used according to the invention
- Fig. 3 shows the current-voltage diagram at various points in the block diagram in Fig. 2, and
- Fig. 1 shows a current-voltage diagram which is obtained in an electrostatic precipitator by virtue of the present invention.
- voltage peaks (U) are obtained with a steep positive growth derivative and a less steep negative derivative.
- each voltage peak is built up by a group of current pulses. The time between each group of current pulses is referred to below as the OFF time, and the time the group of current pulses lasts is referred to below as the ON time.
- Fig. 2 shows a device 200 according to the invention, for generating groups of current pulses which in turn build up the desired individual voltage peaks.
- the device 200 comprises first rectifying means 1-6 for rectifying AC from a power supply into DC, means for monitoring 8,9 and controlling 10 said rectification, means for monitoring 8,9 and controlling 10 the build-up of voltage peaks to the precipitator 7, and means 4,10 for discontinuing each current pulse when the corresponding voltage peak in the precipitator has reached a desired value.
- the first rectifying means preferably also comprise second rectifying means, for converting the high-frequency alternating current from the conversion 4 and transforming means 5 into corresponding direct current pulses, which second rectifying means preferably comprise a rectifier bridge 6.
- the rectifier bridge 6 Connected to the rectifier bridge 6 is the electrostatic precipitator 7, across which the device is to generate voltage peaks.
- the device 200 also comprises controlling means 10.
- the controlling means 10 is used primarily for controlling the build-up of the voltage peaks in the precipitator, for discontinuing each current pulse group when their corresponding voltage peak in the precipitator has reached a desired value, for controlling the above mentioned ON and OFF times as well as the time between the current pulses which form a group of current pulses during the time that a voltage peak is generated, and also the amplitude and frequency of the current pulses.
- a microprocessor 10 is used as controlling means.
- the conversion means comprises semiconductors which are controlled by the controlling means 10, preferably arranged in a so called H-bridge comprising IGBT-transistors (Insulated Gated Bipolar Transistors).
- IGBT-transistors Insulated Gated Bipolar Transistors
- a capacitance and an inductance in the bridge form an oscillating circuit, with the transformer 5, the rectifier 6 and the precipitator 7 as its load.
- the capacitance in the resonance converter is considerably much larger and the inductance considerably smaller than for a normally dimensioned resonance converter.
- the amplitude of the voltage peaks has been transformed up in the section 5-6, in other words the point between the high- voltage transformer 5 and the rectifier bridge 6.
- Fig. 3 also shows the resulting voltage U L and current l output across the precipitator.
- voltage peaks U L are created out across the precipitator, which have a very steep growth derivative.
- the growth derivative is greater than 30 kV/ms.
- the pulses U decay by self-discharge with a derivative which is smaller than the growth derivative. This is due to the fact that the invention, in contrast to previously known art for generating voltage peaks with such a derivative, does not comprise an oscillating circuit.
- the invention may also be applied to any rectifying means controlled by a control means, for creating voltage peaks in an electrostatic precipitator.
Abstract
Description
Claims
Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19983299T DE19983299T1 (en) | 1998-06-18 | 1999-06-18 | Method and device for generating voltage peaks in an electrostatic separator / separator |
PL99344836A PL344836A1 (en) | 1998-06-18 | 1999-06-18 | Method and device for generating voltage peaks in an electrostatic precipitator |
AU48163/99A AU4816399A (en) | 1998-06-18 | 1999-06-18 | Method and device for generating voltage peaks in an electrostatic precipitator |
US09/719,232 US6373723B1 (en) | 1998-06-18 | 1999-06-18 | Method and device for generating voltage peaks in an electrostatic precipitator |
GB0029928A GB2357198B (en) | 1998-06-18 | 1999-06-18 | Method and device for generating voltage peaks in an electrostatic preciptator |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
SE9802177-7 | 1998-06-18 | ||
SE9802177A SE9802177D0 (en) | 1998-06-18 | 1998-06-18 | Method and apparatus for generating voltage pulses to an electrostatic dust separator |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1999065608A1 true WO1999065608A1 (en) | 1999-12-23 |
Family
ID=20411758
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/SE1999/001104 WO1999065608A1 (en) | 1998-06-18 | 1999-06-18 | Method and device for generating voltage peaks in an electrostatic precipitator |
Country Status (7)
Country | Link |
---|---|
US (1) | US6373723B1 (en) |
AU (1) | AU4816399A (en) |
DE (1) | DE19983299T1 (en) |
GB (1) | GB2357198B (en) |
PL (1) | PL344836A1 (en) |
SE (1) | SE9802177D0 (en) |
WO (1) | WO1999065608A1 (en) |
Families Citing this family (22)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6176977B1 (en) | 1998-11-05 | 2001-01-23 | Sharper Image Corporation | Electro-kinetic air transporter-conditioner |
US7695690B2 (en) * | 1998-11-05 | 2010-04-13 | Tessera, Inc. | Air treatment apparatus having multiple downstream electrodes |
US6632407B1 (en) * | 1998-11-05 | 2003-10-14 | 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 |
US20020155041A1 (en) * | 1998-11-05 | 2002-10-24 | Mckinney Edward C. | Electro-kinetic air transporter-conditioner with non-equidistant collector electrodes |
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 |
US6974560B2 (en) * | 1998-11-05 | 2005-12-13 | Sharper Image Corporation | Electro-kinetic air transporter and conditioner device with enhanced anti-microorganism capability |
US6350417B1 (en) | 1998-11-05 | 2002-02-26 | Sharper Image Corporation | Electrode self-cleaning mechanism for electro-kinetic air transporter-conditioner devices |
US6544485B1 (en) * | 2001-01-29 | 2003-04-08 | Sharper Image Corporation | Electro-kinetic device with enhanced anti-microorganism capability |
US20050210902A1 (en) | 2004-02-18 | 2005-09-29 | Sharper Image Corporation | Electro-kinetic air transporter and/or conditioner devices with features for cleaning emitter electrodes |
US20020127156A1 (en) * | 1998-11-05 | 2002-09-12 | Taylor Charles E. | Electro-kinetic air transporter-conditioner devices with enhanced collector electrode |
US6749667B2 (en) * | 2002-06-20 | 2004-06-15 | Sharper Image Corporation | Electrode self-cleaning mechanism for electro-kinetic air transporter-conditioner devices |
US7056370B2 (en) * | 2002-06-20 | 2006-06-06 | Sharper Image Corporation | Electrode self-cleaning mechanism for air conditioner devices |
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 |
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 |
US20060018809A1 (en) | 2004-07-23 | 2006-01-26 | Sharper Image Corporation | Air conditioner device with removable driver electrodes |
US7833322B2 (en) | 2006-02-28 | 2010-11-16 | Sharper Image Acquisition Llc | Air treatment apparatus having a voltage control device responsive to current sensing |
CN102097956A (en) * | 2011-02-25 | 2011-06-15 | 浙江省电力设计院 | High-frequency high-voltage high-power power supply for electrostatic dust removal |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0055525A1 (en) * | 1980-12-17 | 1982-07-07 | F.L. Smidth & Co. A/S | Method of controlling operation of an electrostatic precipitator |
EP0209714A1 (en) * | 1985-06-24 | 1987-01-28 | Metallgesellschaft Ag | Method for operating an electrostatic filter |
US4648887A (en) * | 1984-07-17 | 1987-03-10 | Sumitomo Heavy Industries, Ltd. | Method for controlling electrostatic precipitator |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4600411A (en) * | 1984-04-06 | 1986-07-15 | Lucidyne, Inc. | Pulsed power supply for an electrostatic precipitator |
SE463353B (en) * | 1989-03-28 | 1990-11-12 | Flaekt Ab | SETTING TO REGULATE POWER SUPPLY TO AN ELECTROSTATIC DUST DISPENSER |
SE9103489L (en) * | 1991-11-26 | 1993-02-22 | Flaekt Ab | SETTING TO REGULATE THE POWER SUPPLY TO AN ELECTROSTATIC DUST DISPENSER |
SE501119C2 (en) * | 1993-03-01 | 1994-11-21 | Flaekt Ab | Ways of controlling the delivery of conditioners to an electrostatic dust separator |
-
1998
- 1998-06-18 SE SE9802177A patent/SE9802177D0/en unknown
-
1999
- 1999-06-18 US US09/719,232 patent/US6373723B1/en not_active Expired - Fee Related
- 1999-06-18 DE DE19983299T patent/DE19983299T1/en not_active Withdrawn
- 1999-06-18 GB GB0029928A patent/GB2357198B/en not_active Expired - Fee Related
- 1999-06-18 WO PCT/SE1999/001104 patent/WO1999065608A1/en active Application Filing
- 1999-06-18 PL PL99344836A patent/PL344836A1/en not_active Application Discontinuation
- 1999-06-18 AU AU48163/99A patent/AU4816399A/en not_active Abandoned
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0055525A1 (en) * | 1980-12-17 | 1982-07-07 | F.L. Smidth & Co. A/S | Method of controlling operation of an electrostatic precipitator |
US4648887A (en) * | 1984-07-17 | 1987-03-10 | Sumitomo Heavy Industries, Ltd. | Method for controlling electrostatic precipitator |
EP0209714A1 (en) * | 1985-06-24 | 1987-01-28 | Metallgesellschaft Ag | Method for operating an electrostatic filter |
Also Published As
Publication number | Publication date |
---|---|
GB2357198A (en) | 2001-06-13 |
GB2357198B (en) | 2002-12-04 |
DE19983299T1 (en) | 2001-05-10 |
AU4816399A (en) | 2000-01-05 |
US6373723B1 (en) | 2002-04-16 |
SE9802177D0 (en) | 1998-06-18 |
GB0029928D0 (en) | 2001-01-24 |
PL344836A1 (en) | 2001-11-19 |
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