EP0332624A1 - An electrostatic precipitator for use in electrofilters. - Google Patents
An electrostatic precipitator for use in electrofilters.Info
- Publication number
- EP0332624A1 EP0332624A1 EP87907361A EP87907361A EP0332624A1 EP 0332624 A1 EP0332624 A1 EP 0332624A1 EP 87907361 A EP87907361 A EP 87907361A EP 87907361 A EP87907361 A EP 87907361A EP 0332624 A1 EP0332624 A1 EP 0332624A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- electrodes
- terminal
- voltage source
- electrically
- precipitator
- 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.)
- Granted
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
- B03C3/70—Applications of electricity supply techniques insulating in electric separators
-
- 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
Definitions
- the present invention relates to an electrostatic precipi ⁇ tator for use in electrostatic filters, so-called electro- filters.
- an electrostatic precipitator comprises a multiple of electrode plates or electrode lamellae which are electrically conductive or semi-conductive and which are arranged in mutually spaced parallel relationship and alternatively connected electrically to a respective termi ⁇ nal of a d.c. voltage source, such as to produce a structur ⁇ al device similar to an air capacitor connected to both terminals of the d.c. voltage source.
- An electrostatic precipitator of this kind is placed in the air flow passage or duct of an electrofilter in a manner such that the elec ⁇ trode plates or lamellae extend transversely across the air duct or air-flow passage in which the filter is placed, with the side surfaces of said plate electrodes parallel with the direction of air flow through the duct.
- the air flow to be cleansed of aerosol contaminants present in the form of solid particles or liquid droplets is driven through the air-flow duct, and therewith through the precipitator, by means of a blower or fan, natural ventilation, forced draught, or with the aid of an electric ion wind (c.f.
- the elec- trofilter incorporates upstream of the electrostatic pre ⁇ cipitator means for electrically charging the aerosol con ⁇ taminants present in the air flow in some suitable known manner, e.g. by means of a corona discharge which generates air ions.
- the purpose of the electrostatic precipitator is therewith to bring the electrically charged contaminants in the air flow passing through the precipitator, between the various plate electrodes thereof, under the influence of the electric field which is generated between adjacent elec- trodes and which extends essentially at right angles to the direction of air flow, such that the contaminants will migrate to one or the other of said electrodes, depending on the electrical polarity of the contaminants, and fasten on said electrodes, therewith cleansing the air flow from said contaminants.
- Such glow discharges occur in particular at the edges of the electrodes, which are normally made of thin sheet metal, and the phenomenon is particularly troublesome when these edges are sharp or irregular, as a result of the method used to manufacture said electrodes, and is heightened still further by the dirt which collects unavoidably on the precipitation electrodes while the precipitator is in use.
- Such glow dis ⁇ charges give rise to highly disturbing noise levels (crack ⁇ les and rattles), and also generate ozone in undesirable and at times unacceptable levels. It will also be under- stood that the precipitation electrodes must be held in position at the required distance apart, in some way or another.
- an electrostatic precipi ⁇ tator will present a significant capacitance. Consequently, a powerful capacitive discharge current will be released, if the electrodes of the precipitator are __x_ ⁇ __d unintentionally. This current is highly unpleasant and may even be dangerous. Consequently, when electrofilters of this kind are to be used in a human environment, e.g. in domestic environments or working environments, it must be ensured that the elec ⁇ trostatic precipitator cannot be touched unintentionally. This often places on the construction of the electrofilter demands which conflict with other structural desiderata, such as small dimensions, low air-flow resistance,, etc.
- One object of the invention is therefore to provide an elec ⁇ trostatic precipitator of the kind described in the intro- duction with which the aforesaid problems and difficulties are overcome, such as to enable a higher voltage and a smaller mutual interspacing to be applied between the ad ⁇ jacent electrodes of said precipitator, thereby achieving a more effective separation of the electrically charged aero- sol contaminants from the air flowing through the precipi ⁇ tator or filter than can be achieved with known electro- filters of this kind.
- This object is achieved in accordance with the invention in that at least the electrodes connected to one terminal of the d.c. voltage source are connected to said terminal individually, i.e. each per se, instead of being connected directly with one another as with electrostatic precipi- tators known hitherto.
- This separate connection of the electrodes or precipitation elements to said one pole is achieved by placing a side-edge part of respective elec ⁇ trodes in pressure contact with one side of an individual sheet-like or strip-like member which is made of a highly resistive material and which is provided at its point of contact with said electrode with a separate electrical con ⁇ tact means which is connected electrically to the relevant terminal of the d.c. voltage source.
- One terminal of the high voltage source is normally earthed, wherewith at least the electrodes connected to the high voltage terminal of the d.c. voltage source are connected • individually and each per se to said source in the afore- described manner.
- the aforementioned highly resistive material conveniently consists of a plastic which is highly resistive, so-called antistatic plastic or a plastic treated to become anti ⁇ static, for example a plastic material of the kind used to package semi-conductor components so that said components are protected against the effect of electrostatic voltages.
- anti-static, or anti-static treated, plastic materials are available commercially and normally have a surface re ⁇ sistivity of from 10 -10 jfl, normally in the order of lO 1 ⁇ !.
- At least the electrodes connected to the one terminal of the d.c. voltage source namely the non-earthed high voltage terminal of said source, are connected electrically to said terminal and to each other through very high resistances.
- those currents which are able to occur as a result of electrical discharges from the electrodes or as a result of creep currents along electrically :_nsulating spacer members be ⁇ tween adjacent electrodes with differing voltages will be limited to exceedingly small values, e.g. values in the order of 10-100 nA.
- each electrode of an electrostatic precipitator that is constructed in accordance with the in ⁇ vention will adjust automatically to an individual voltage level in response to extremely moderate discharges and/or extremely low creep currents along the electrically insu ⁇ lating spacer members. Even a direct short circuit between two mutually adjacent electrodes will produce no harmful short-circuit currents, and neither will it affect the voltage level of the remaining electrodes thereby enabling the precipitator to continue to operate practically without interference.
- the invention also eliminates the possible occurrence of powerful comparitive discharge currents in the event of physical contact with the electrodes, thereby also, eliminating the hazards or unpleasantness that such unin- tentional contact would otherwise cause.
- the single Figure of the accompanying drawing is a schematic view of the inventive electrostatic precipitator as seen in the direction of air flow through the precipitator or the electrofilter.
- the air duct in which the precipitator is placed has been omitted from the illustration, for the sake of simplicity and clarity.
- the illustrated precipitator is comprised of a plurality of lamellae-like or plate-like electrodes 1 and 2 which are arranged in mutually parallel and mutually spaced relation ⁇ ship, with the side surfaces of the electrodes 1 and 2 ex ⁇ tending parallel with the direction of air flow, i.e. at right angles to the plane of the drawing.
- These electrodes, or precipitation elements are electrically conductive or semi-conductive. It shall be observed in this regard that the currents to be conducted by the electrodes are very small, since they correspond solely to the electrical charge of the contaminants which precipitate onto the electrodes and to the electrical charge of those air ions which might discharge in the vicinity of the electrodes.
- the electrodes 1, 2 may therefore be made of metal or constructed from a weakly conductive or semi-conductive material, such as a semi-conductive paper or paperboard construction for example.
- Each alternate electrode 1, 2 of the precipitator is con ⁇ nected electrically to a respective terminal or pole of a d.c. voltage source 3.
- this connection of the precipitation electrodes 1, 2 to a respective one of the two terminals of the voltage source 3 is achieved by- bringing one side-edge surface of a respective electrode, or at least parts of said one side- edge surface, into pressure contact with one side of a respective sheet-like or strip-like member 4 or 5 which is made of a highly resistive material, such as a so-called antistatic plastic, or a plastic which has been made anti ⁇ static.
- a so-called antistatic plastic or a plastic which has been made anti ⁇ static.
- antistatic, or antistatic treated materials are well known per se and are used, inter alia, to wrap semi-conductor components so as to protect the same against electrostatic voltages during the transportation and storage of such components.
- These plastic materials have a surface resistivity of from 10 9-1015__1, normally of the order of
- the plastic members 4, 5 may have a thickness of e.g. 1—5 mm, and will be slightly resilient or elastic, such as to enable the side edges of the electrodes 1, 2 to be held in firm abutment with one side surface of respective plastic members, with the aid of a suitably adapted pressure.
- the mutually opposing side surfaces of the plastic members 4, 5 have pro ⁇ vided thereon respective electrical contact means 6, 7, e.g. in the form of metal wires, metal, strips, metal plates or the like which are held pressed against the surfaces of respective plastic members a d which areconnected electri ⁇ cally to a respective terminal of the d.c. voltage source 3, suitably through a respective high-ohmic resistance 8, 9.
- each of the precipitation electrodes 1, 2 is electrically connected individually to its associated terminal of the d.c. voltage source 3, through a very high resistance formed by the respective antistatic plastic member 4 and 5.
- this high resistance will also lie mutually between the various electrodes 1, 2 which are connected in common to the same terminal of the voltage cource 3.
- those electrical discharges which are able to occur at the edges of the electrodes 1, 2 will be limited to such an extent as to be totally inaudible and such as to generate no appreciable amounts of ozone.
- the particular construction of the inventive electrostatic precipitator also ensures that no large, dangerous or unpleasant discharge currents can occur as the result of unintentional physical contact with the elctrodes 1, 2.
- the primary purpose of the high-ohmic resistances 8-, 9 is to prevent the occurrence of large short-circuit currents should one of the plastic members 4, 5 be short-circuited, e.g., as a result of coming into unintentional contact with water.
- one of the terminals of the d.c. voltage source 3 is earthed, as illustrated in the drawing.
- this earthed terminal of the d.c. voltage source 3 directly to corre ⁇ sponding precipitation electrodes 2 in a conventional manner.
- the precipitation electrodes 1, 2 of an electrostatic precipitator constructed in accordance with the illustrated embodiment such that the distance be ⁇ tween the plastic member 4 and the electrodes 2 that are not connected to said member is greater than the mutual distance between mutually adjacent electrodes 1 and 2.
- the distance between the plastic member 5 and the electrodes 1 is greater than the mutual distance between mutually adjacent electrodes 1 and 2. This arrangement of the electrodes will prevent a direct spark-over between the electrodes 2 and the plastic member 4, and between the elec ⁇ trodes 1 and the plastic member 5.
- the electrodes 1 and 2 are held in position, at the desired distance apart, with the aid of spacer members (not shown) which are made of an electrically insulating material.
- spacer members (not shown) which are made of an electrically insulating material.
- the spacer members may be formed from a suitably moldable, electrically insulating resin or glue which is applied at suitable- locations be ⁇ tween the precipitation electrodes 1 and 2.
- the inventive precipitator can be manufactured readily and at low costs. This enables the precipitator to be intended for one-time use only, i.e. the electrostatic precipitator, or at least the part thereof formed by the electrodes 1, 2, can be discarded and replaced with a new precipitator or a new electrode pack when the old precipi ⁇ tator or electrode pack has become too dirty for effective use.
Landscapes
- Electrostatic Separation (AREA)
- Elimination Of Static Electricity (AREA)
- Separation Using Semi-Permeable Membranes (AREA)
Abstract
Description
Claims
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AT87907361T ATE70997T1 (en) | 1986-10-30 | 1987-10-29 | ELECTROSTATIC PRECIPITATION DEVICE FOR USE WITH ELECTRIC FILTERS. |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
SE8604634A SE455170B (en) | 1986-10-30 | 1986-10-30 | ELECTROFILTER Condenser Separator |
SE8604634 | 1986-10-30 |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0332624A1 true EP0332624A1 (en) | 1989-09-20 |
EP0332624B1 EP0332624B1 (en) | 1992-01-02 |
Family
ID=20366124
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP87907361A Expired - Lifetime EP0332624B1 (en) | 1986-10-30 | 1987-10-29 | An electrostatic precipitator for use in electrofilters |
Country Status (7)
Country | Link |
---|---|
EP (1) | EP0332624B1 (en) |
JP (1) | JPH0773685B2 (en) |
AT (1) | ATE70997T1 (en) |
AU (1) | AU8230287A (en) |
DE (1) | DE3775779D1 (en) |
SE (1) | SE455170B (en) |
WO (1) | WO1988003057A1 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5993521A (en) * | 1992-02-20 | 1999-11-30 | Tl-Vent Ab | Two-stage electrostatic filter |
Families Citing this family (20)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH0522044U (en) * | 1991-09-06 | 1993-03-23 | 山武ハネウエル株式会社 | Dust collection cell |
SE9400110L (en) * | 1994-01-17 | 1995-07-18 | Tl Vent Ab | air cleaning apparatus |
US6176977B1 (en) | 1998-11-05 | 2001-01-23 | Sharper Image Corporation | Electro-kinetic air transporter-conditioner |
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 |
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 |
US6632407B1 (en) | 1998-11-05 | 2003-10-14 | Sharper Image Corporation | Personal electro-kinetic air transporter-conditioner |
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 |
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 |
US20060016333A1 (en) | 2004-07-23 | 2006-01-26 | Sharper Image Corporation | Air conditioner device with removable driver electrodes |
CN1911526B (en) * | 2005-08-10 | 2010-08-18 | 金烈水 | High efficiency electrostatic dust separator |
US7833322B2 (en) | 2006-02-28 | 2010-11-16 | Sharper Image Acquisition Llc | Air treatment apparatus having a voltage control device responsive to current sensing |
JP2010063964A (en) * | 2008-09-09 | 2010-03-25 | Panasonic Corp | Dust collecting apparatus |
US9005347B2 (en) | 2011-09-09 | 2015-04-14 | Fka Distributing Co., Llc | Air purifier |
US10882053B2 (en) | 2016-06-14 | 2021-01-05 | Agentis Air Llc | Electrostatic air filter |
US20170354980A1 (en) | 2016-06-14 | 2017-12-14 | Pacific Air Filtration Holdings, LLC | Collecting electrode |
US10828646B2 (en) | 2016-07-18 | 2020-11-10 | Agentis Air Llc | Electrostatic air filter |
US10875034B2 (en) | 2018-12-13 | 2020-12-29 | Agentis Air Llc | Electrostatic precipitator |
US10792673B2 (en) | 2018-12-13 | 2020-10-06 | Agentis Air Llc | Electrostatic air cleaner |
JP7015596B1 (en) * | 2021-06-18 | 2022-02-03 | エステアール株式会社 | Transparent electrostatic adsorption partition and transparent electrostatic adsorption partition system |
Family Cites Families (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
AT377204B (en) * | 1980-11-05 | 1985-02-25 | Hans Oppitz | ELECTRODE FOR PREFERRED ELECTROSTATIC APPLICATIONS |
US4477268A (en) * | 1981-03-26 | 1984-10-16 | Kalt Charles G | Multi-layered electrostatic particle collector electrodes |
-
1986
- 1986-10-30 SE SE8604634A patent/SE455170B/en not_active IP Right Cessation
-
1987
- 1987-10-29 AU AU82302/87A patent/AU8230287A/en not_active Abandoned
- 1987-10-29 WO PCT/SE1987/000509 patent/WO1988003057A1/en active IP Right Grant
- 1987-10-29 JP JP62506846A patent/JPH0773685B2/en not_active Expired - Fee Related
- 1987-10-29 AT AT87907361T patent/ATE70997T1/en not_active IP Right Cessation
- 1987-10-29 EP EP87907361A patent/EP0332624B1/en not_active Expired - Lifetime
- 1987-10-29 DE DE8787907361T patent/DE3775779D1/en not_active Expired - Fee Related
Non-Patent Citations (1)
Title |
---|
See references of WO8803057A1 * |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5993521A (en) * | 1992-02-20 | 1999-11-30 | Tl-Vent Ab | Two-stage electrostatic filter |
Also Published As
Publication number | Publication date |
---|---|
WO1988003057A1 (en) | 1988-05-05 |
SE8604634D0 (en) | 1986-10-30 |
SE8604634L (en) | 1988-05-01 |
DE3775779D1 (en) | 1992-02-13 |
SE455170B (en) | 1988-06-27 |
ATE70997T1 (en) | 1992-01-15 |
AU8230287A (en) | 1988-05-25 |
EP0332624B1 (en) | 1992-01-02 |
JPH0773685B2 (en) | 1995-08-09 |
JPH02500727A (en) | 1990-03-15 |
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