US3827217A - Electrostatic precipitator for the collection of particles contained in a gas - Google Patents

Electrostatic precipitator for the collection of particles contained in a gas Download PDF

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US3827217A
US3827217A US00316522A US31652272A US3827217A US 3827217 A US3827217 A US 3827217A US 00316522 A US00316522 A US 00316522A US 31652272 A US31652272 A US 31652272A US 3827217 A US3827217 A US 3827217A
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R Volsy
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Commissariat a lEnergie Atomique et aux Energies Alternatives CEA
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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
    • B03C3/34—Constructional details or accessories or operation thereof
    • B03C3/36—Controlling flow of gases or vapour
    • 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
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
    • Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
    • Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
    • Y02A50/2351—Atmospheric particulate matter [PM], e.g. carbon smoke microparticles, smog, aerosol particles, dust

Definitions

  • the present invention is concerned with a device for the collection of polluting particles contained in a sample of atmospheric air.
  • the device also permits the removal of dust from a gas and consequently the purification of this latter.
  • By collecting the impurities contained in the atmosphere or in any other gas it is possible to carry out both a qualitative and quantitative analysis of said impurities or in other words to determine the concentration of impurities and to perform a chemical analysis of said impurities.
  • inertial systems based on gravity settling, particle impact or centrifugal force; the disadvantage of these systems lies in their low collection efficiency in the case of particles which have a small mass (for example particles smaller than 1 micron in'diameter);
  • thermal precipitation systems (bombardment of photons); on the contrary, these systems permit retention only of particles which have a very small mass;
  • electrostatic precipitation devices consist of a pin or a wire which serves as an ion source and is placed along the axis of a cylinder of revolution, the particles being precipitated on the cylinder walls. Recovery of the deposits thus obtained is a difficult operation and the efficiency of this type of apparatus decreases very rapidly in time as the particle deposits are formed on the wire; moreover, the design concept of these devices precludes any automatic adaptation to the measurement of particle concentration.
  • the precise object of the present invention is to provide an electrostatic precipitator for the collection of particles contained in a gas which overcomes the disadvantages attached to the techniques of the prior art which were mentioned in the foregoing.
  • the electrostatic precipitator for the collection of particles contained in a gas essentially comprises:
  • a leak-tight chamber of substantial length a first inlet duct for the admission of gas to be analyzed and a second inlet duct for the supply of clean gas which are located in parallel relation and have their openings at one end of said chamber, at least one outlet duct located opposite to the first inlet duct at the other end of said chamber, at least two electrodes having different functions being placed within the interior of said chamber, one electrode being a conductive plate located close to that wall of said chamber which is adjacent to the first and third ducts, the geometry of the other electrode or electrodes being such as to produce in conjunction with the conductive plate a corona discharge in the gas which is present within said chamber;
  • deflectors which provide a separation both at the inlet and at the outlet between the gas streams of the ducts while ensuring relative independence between the polluted gas stream which is admitted through the first duct and discharged through the third duct, and
  • the electrode which produces the corona discharge can be, for example, either a conductive wire which is parallel to said plate or a conductive pin which is located at right angles to said plate.
  • the gases are introduced through the first and second ducts.
  • the electrode which produces the corona discharge is placed in the line of extension of the second duct.
  • the same system formed by the electrodes therefore serves to carry out both the charging of the particles contained in the polluted gas to be analyzed and to cause precipitation of said particles.
  • Charging of the particles is produced by the ionized molecules of air resulting from corona discharge by applying a potential difference between the electrodes.
  • the particles which are thus ionized are received by the plate under the action of the electrostatic field applied between the plate and the electrode which produces the corona discharge. Vortices arising from the electric wind are eliminated while ensuring a flow of clean gas between the electrodes, which prevents any loss of aerosols on the walls of the collection chamber. This result is obtained under very good conditions by placing the corona discharge electrode in the axis of the clean gas supply duct or in an extreme position corresponding to the inlet of the two ducts for the admission of clean gas and polluted gas.
  • the electrostatic device for collecting particles in a gas as shown in FIG. 1 essentially comprises a leak-tight chamber 2 of substantial length and having a parallelepipedal shape, for example, said chamber being connected at one end to the inlet ducts 4 and 6 and at the other end to the outlet duct 8.
  • the chamber 2 is provided internally with a conductive metallic plate 10 which is fixed on the bottom wall of said chamber 2 and electrically insulated from said wall. Provision is also made within the chamber 2 for a conductive wire 12 which is parallel to the axis of this latter and placed in the line of extension of the inlet duct 6. Said wire is maintained in position by means of two insulating supports 14 and 14'.
  • An electric current generator 16 serves to apply between the conductive wire 12 and the plate 10 a direct-current potential difference V
  • the duct 8 is connected to a suction device 17 of known type.
  • the gas streams corresponding to the inlet ,ducts 4 and 6 are partially separated by the deflectors l8 and 18'.
  • the chamber 2 is provided with an outlet duct 20 which is located in the line of extension of the inlet duct 6.
  • the duct 20 is fitted with an adjustable closure system 22.
  • the electric conductor which produces the corona discharge in conjunction with the conductive plate is a conductive wire 12 located parallel to the axis of the chamber 2 but, as has been stated earlier, the electric conductor can consist of a conductive pin placed at right angles to the conductive plate 10.
  • the operation of the device is immediately apparent from the foregoing description.
  • the polluted gas which is introduced into the chamber 2 through the inlet duct 4 is ionized by virtue of the assembly consisting of the conductive wire 12 and the plate 10.
  • the wire 12 behaves as a charge emitter since it is subjected to the corona effect and applies a potential difference V between the wire 12 and the plate 10.
  • the gas is accordingly ionized and the ion space charge confers a charge on the particles in suspension in the gas.
  • These charged particles are then attracted by the plate 10 which has the same effect as a collecting plate and thus collects the particles contained in the polluted gas.
  • the rate of flow of the gas injected into the duct 6 can advantageously represent to 30 percent of the throughput of polluted gas.
  • the rate of flow of the gas within the chamber 2 under the action of the suction device 17 can advantageously be within the range of 10 to 400 cm/second; the direct-current potential difference V applied between the plate 10 and the conductive wire 12 can be within the range of 2 to 40 kV whereas, in a preferred embodiment, the length of the chamber 2 can range from 3 to 30 cm according to the voltage applied, the rate of propagation of the gas and the percentage content of impurities.
  • the collecting plate 10 can be adapted to an automatic measuring device which can be constituted by an electrometer, by a piezo-electric strip or by a moving film and the quantity of polluted gas introduced into the apparatus can be measured by means of a flowmeter.
  • means can be provided for cleaning the plate 10 by scraping or sweeping said plate, for example.
  • An electrostatic precipitator for the collection of particles contained in a gas wherein said precipitator comprises:
  • a leak-tight chamber of substantial length a first inlet duct for the admission of gas to be analyzed and a second inlet duct for the supply of clean gas which are located in parallel relation and have their openings at one end of said chamber, at least one outlet duct or third duct located opposite to said first inlet duct at the other end of said chamber, at least two electrodes having different functions being placed within the interior of said chamber, at least one other of said electrodes being a conductive plate located close to that wall of said chamber which is adjacent to the first and third ducts, the geometry of at least one other of said electrodes being such as to produce in conjunction with the conductive plate a corona discharge in the gas which is present within said chamber;
  • deflectors which provide a separation both at the inlet and at the outlet between the gas streams of the ducts while ensuring relative independence between the polluted gas stream which is admitted through the first duct and discharged through the third duct, and the clean gas stream which is admitted through the second duct;
  • a direct-current generator which applies a directcurrent potential difference between the electrodes.
  • a precipitator according to claim 1, wherein the electrode which produces the corona discharge is a conductive wire in substantially parallel relation to the conductive plate.
  • a precipitator according to claim 1, wherein the electrode which produces the corona discharge is a conductive pin located at right angles to the conductive plate.
  • a precipitator according to claim 1 including a fourth duct opposite to the second duct and said fourth duct having a device for varying the opening of said duct.
  • a precipitator according to claim 1 including a cleaning system for said conductive plate.

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  • Electrostatic Separation (AREA)
  • Sampling And Sample Adjustment (AREA)
  • Other Investigation Or Analysis Of Materials By Electrical Means (AREA)

Abstract

Particles suspended in polluted gas or atmospheric air to be analyzed and purified are charged and precipitated in a single unit comprising a leak-tight chamber of substantial length, an admission duct for the gas to be analyzed and a ''''clean'''' gas supply duct which are parallel and open into one end of the chamber, at least one outlet duct being located opposite to the admission duct at the other end of the chamber. The chamber contains at least two electrodes, one of which is a conductive plate adjacent to the admission and outlet ducts, the other being at least one electrode such as a conductive wire which produces a corona discharge in the gas.

Description

nited States Patent [191 Volsy Aug. 6, 1974 ELECTROSTATIC PRECIPITATOR FOR THE COLLECTION OF PARTICLES CONTAINED IN A GAS [30] Foreign Application Priority Data Dec. 31, 1971 France 71.47801 [52] U.S. Cl 55/121, 55/128, 55/146, 55/151, 55/152, 55/270, 73/28, 324/71 CP [51] Int. Cl. B03c 3/04 [58] Field of Search 55/146, 150, 151, 152, 55/128, 129, 120, 121, 270; 324/32, 33, 71
R, 71 CP; 73/23 R, 28; 310/81, 317/3, 4
[56] References Cited UNITED STATES PATENTS 2,097,233 10/1937 Meston 55/152 X 2,868,318 1/1959 Perkins et a1. 55/151 3,331,192 7/1967 Peterson 55/107 3,413,545 11/1968 Whitby 317/3 X 3,516,608 6/1970 Bowen et al. 239/3 X 3,520,172 7/1970 Liu et al. 55/138 X 3,526,828 9/1970 Whitby 324/71 CP X 3,561,253 2/1971 Dorman 310/8.1 X 3,656,440 4/1972 Grey 110/8 R 3,718,029 2/1973 Gourdine et a1 73/28 FOREIGN PATENTS OR APPLICATIONS 833,798 3/1952 Germany 55/D1G. 38
Primary Examiner-Dennis E. Talbert, Jr. Attorney, Agent, or FirmCameron, Kerkam, Sutton, Stowell & Stowell [57] ABSTRACT Particles suspended in polluted gas or atmospheric air to be analyzed and purified are charged and precipitated in a single unit comprising a leak-tight chamber of substantial length, an admission duct for the gas to be analyzed and a clean gas supply duct which are parallel and open into one end of the chamber, at least one outlet duct being located opposite to the admission duct at the other end of the chamber. The chamber contains at least two electrodes, one of which is a conductive plate adjacent to the admission and outlet ducts, the other being at least one electrode such as a conductive wire which produces a corona discharge in the gas.
8 Claims, 1 Drawing Figure ELECTROSTATIC PRECIPITATOR FOR THE COLLECTION OF PARTICLES CONTAINED IN A GAS This invention relates to an electrostatic precipitator for the collection of particles in a gas such as air.
More precisely, the present invention is concerned with a device for the collection of polluting particles contained in a sample of atmospheric air. The device also permits the removal of dust from a gas and consequently the purification of this latter. By collecting the impurities contained in the atmosphere or in any other gas, it is possible to carry out both a qualitative and quantitative analysis of said impurities or in other words to determine the concentration of impurities and to perform a chemical analysis of said impurities.
Control of air pollution, especially in large urban areas, constitutes a problem of considerable importance. Many types of particle collection equipment are already in use and among these can be mentioned:
systems of filtration through porous fabrics; by means of these systems, the pores choke at a very high rate and the device rapidly becomes inoperative;
inertial systems based on gravity settling, particle impact or centrifugal force; the disadvantage of these systems lies in their low collection efficiency in the case of particles which have a small mass (for example particles smaller than 1 micron in'diameter);
the thermal precipitation systems (bombardment of photons); on the contrary, these systems permit retention only of particles which have a very small mass;
electrostatic precipitation devices; as a rule, these devices consist of a pin or a wire which serves as an ion source and is placed along the axis of a cylinder of revolution, the particles being precipitated on the cylinder walls. Recovery of the deposits thus obtained is a difficult operation and the efficiency of this type of apparatus decreases very rapidly in time as the particle deposits are formed on the wire; moreover, the design concept of these devices precludes any automatic adaptation to the measurement of particle concentration.
The precise object of the present invention is to provide an electrostatic precipitator for the collection of particles contained in a gas which overcomes the disadvantages attached to the techniques of the prior art which were mentioned in the foregoing.
The electrostatic precipitator for the collection of particles contained in a gas essentially comprises:
a leak-tight chamber of substantial length, a first inlet duct for the admission of gas to be analyzed and a second inlet duct for the supply of clean gas which are located in parallel relation and have their openings at one end of said chamber, at least one outlet duct located opposite to the first inlet duct at the other end of said chamber, at least two electrodes having different functions being placed within the interior of said chamber, one electrode being a conductive plate located close to that wall of said chamber which is adjacent to the first and third ducts, the geometry of the other electrode or electrodes being such as to produce in conjunction with the conductive plate a corona discharge in the gas which is present within said chamber;
deflectors which provide a separation both at the inlet and at the outlet between the gas streams of the ducts while ensuring relative independence between the polluted gas stream which is admitted through the first duct and discharged through the third duct, and
the clean gas stream which is admitted through the second duct;
a generator which serves to deliver direct or modulated current and applies a direct-current potential difference between the electrodes. The electrode which produces the corona discharge can be, for example, either a conductive wire which is parallel to said plate or a conductive pin which is located at right angles to said plate.
The gases are introduced through the first and second ducts. In a preferred embodiment, provision is made for a suction device within the third duct. In another preferred embodiment, the electrode which produces the corona discharge is placed in the line of extension of the second duct.
By means of the device in accordance with the invention, the same system formed by the electrodes therefore serves to carry out both the charging of the particles contained in the polluted gas to be analyzed and to cause precipitation of said particles.
Charging of the particles is produced by the ionized molecules of air resulting from corona discharge by applying a potential difference between the electrodes.
The particles which are thus ionized are received by the plate under the action of the electrostatic field applied between the plate and the electrode which produces the corona discharge. Vortices arising from the electric wind are eliminated while ensuring a flow of clean gas between the electrodes, which prevents any loss of aerosols on the walls of the collection chamber. This result is obtained under very good conditions by placing the corona discharge electrode in the axis of the clean gas supply duct or in an extreme position corresponding to the inlet of the two ducts for the admission of clean gas and polluted gas.
A clearer understanding of the invention will in any case be gained from the following description of one embodiment of the invention which is given by way of non-limitative example. Reference is made in the description to the single accompanying FIGURE in which the device according to the invention is shown in longitudinal cross-section.
The electrostatic device for collecting particles in a gas as shown in FIG. 1 essentially comprises a leak-tight chamber 2 of substantial length and having a parallelepipedal shape, for example, said chamber being connected at one end to the inlet ducts 4 and 6 and at the other end to the outlet duct 8. The chamber 2 is provided internally with a conductive metallic plate 10 which is fixed on the bottom wall of said chamber 2 and electrically insulated from said wall. Provision is also made within the chamber 2 for a conductive wire 12 which is parallel to the axis of this latter and placed in the line of extension of the inlet duct 6. Said wire is maintained in position by means of two insulating supports 14 and 14'. An electric current generator 16 serves to apply between the conductive wire 12 and the plate 10 a direct-current potential difference V In this example, the duct 8 is connected to a suction device 17 of known type. Within the chamber 2, the gas streams corresponding to the inlet ,ducts 4 and 6 are partially separated by the deflectors l8 and 18'. In this example, the chamber 2 is provided with an outlet duct 20 which is located in the line of extension of the inlet duct 6.
In one alternative form of construction, the duct 20 is fitted with an adjustable closure system 22.
in the precipitator shown in the FIGURE, the electric conductor which produces the corona discharge in conjunction with the conductive plate is a conductive wire 12 located parallel to the axis of the chamber 2 but, as has been stated earlier, the electric conductor can consist of a conductive pin placed at right angles to the conductive plate 10.
The operation of the device is immediately apparent from the foregoing description. The polluted gas which is introduced into the chamber 2 through the inlet duct 4 is ionized by virtue of the assembly consisting of the conductive wire 12 and the plate 10. The wire 12 behaves as a charge emitter since it is subjected to the corona effect and applies a potential difference V between the wire 12 and the plate 10. The gas is accordingly ionized and the ion space charge confers a charge on the particles in suspension in the gas. These charged particles are then attracted by the plate 10 which has the same effect as a collecting plate and thus collects the particles contained in the polluted gas. The gas which is introduced through the duct 6 and can be either a clean gas or the gas which is withdrawn from the duct 8 compensates for the electric wind produced by the corona discharge. This prevents any formation of vortices and any deposition of particles on the walls of the chamber 2 other than the plate 10. The rate of flow of the gas injected into the duct 6 can advantageously represent to 30 percent of the throughput of polluted gas.
By way of indication, the rate of flow of the gas within the chamber 2 under the action of the suction device 17 can advantageously be within the range of 10 to 400 cm/second; the direct-current potential difference V applied between the plate 10 and the conductive wire 12 can be within the range of 2 to 40 kV whereas, in a preferred embodiment, the length of the chamber 2 can range from 3 to 30 cm according to the voltage applied, the rate of propagation of the gas and the percentage content of impurities.
In order to perform automatic measurement of the particle concentration of the polluted gas, the collecting plate 10 can be adapted to an automatic measuring device which can be constituted by an electrometer, by a piezo-electric strip or by a moving film and the quantity of polluted gas introduced into the apparatus can be measured by means of a flowmeter.
Should it be desired to remove dust from a gas, means can be provided for cleaning the plate 10 by scraping or sweeping said plate, for example.
Tests carried out with a device of this type on the basis of polluted and opaque gas of a smoke-producing charge have shown that the polluted air delivered at the discharge end was wholly transparent and undetectable by the naked eye. All the particles were precipitated tional design, is therefore inexpensive to produce and also has very high reliability of operation; by virtue of the fact that the particles are collected on a single flat plate, removal of said particles for subsequent chemical analysis presents no difficulty.
It can readily be understood that the present invention is not limited to the example which has been more especially described with reference to the accompanying drawing; on the contrary, all variants are included within its scope, especially the alternative form of construction in which the bottom wall of the chamber 2 is replaced by the plate 10.
What we claim is:
1. An electrostatic precipitator for the collection of particles contained in a gas, wherein said precipitator comprises:
a leak-tight chamber of substantial length, a first inlet duct for the admission of gas to be analyzed and a second inlet duct for the supply of clean gas which are located in parallel relation and have their openings at one end of said chamber, at least one outlet duct or third duct located opposite to said first inlet duct at the other end of said chamber, at least two electrodes having different functions being placed within the interior of said chamber, at least one other of said electrodes being a conductive plate located close to that wall of said chamber which is adjacent to the first and third ducts, the geometry of at least one other of said electrodes being such as to produce in conjunction with the conductive plate a corona discharge in the gas which is present within said chamber;
deflectors which provide a separation both at the inlet and at the outlet between the gas streams of the ducts while ensuring relative independence between the polluted gas stream which is admitted through the first duct and discharged through the third duct, and the clean gas stream which is admitted through the second duct;
a direct-current generator which applies a directcurrent potential difference between the electrodes.
2. A precipitator according to claim 1, wherein the corona-discharge electrode is located in the line of extension of the second duct.
3. A precipitator according to claim 1, wherein the electrode which produces the corona discharge is a conductive wire in substantially parallel relation to the conductive plate.
4. A precipitator according to claim 1, wherein the electrode which produces the corona discharge is a conductive pin located at right angles to the conductive plate.
5. A precipitator according to claim 1 wherein, the third duct includes a suction device.
6. A precipitator according to claim 1, including a fourth duct opposite to the second duct and said fourth duct having a device for varying the opening of said duct.
7. A precipitator according to claim 1 wherein said conductive plate is connected to a measuring apparatus.
8. A precipitator according to claim 1 including a cleaning system for said conductive plate.
l l l

Claims (8)

1. An electrostatic precipitator for the collection of particles contained in a gas, wherein said precipitator comprises: a leak-tight chamber of substantial length, a first inlet duct for the admission of gas to be analyzed and a second inlet duct for the supply of ''''clean'''' gas which are located in parallel relation and have their openings at one end of said chamber, at least one outlet duct or third duct located opposite to said first inlet duct at the other end of said chamber, at least two electrodes having different functions being placed within the interior of said chamber, at least one other of said electrodes being a conductive plate located close to that wall of said chamber which is adjacent to the first and third ducts, the geometry of at least one other of said electrodes being such as to produce in conjunction with the conductive plate a corona discharge in the gas which is present within said chamber; deflectors which provide a separation both at the inlet and at the outlet between the gas streams of the ducts while ensuring relative independence between the polluted gas stream which is admitted through the first duct and discharged through the third duct, and the ''''clean'''' gas stream which is admitted through the second duct; a direct-current generator which applies a direct-current potential difference between the electrodes.
2. A precipitator according to claim 1, wherein the corona-discharge electrode is located in the line of extension of the second duct.
3. A precipitator according to claim 1, wherein the electrode which produces the corona discharge is a conductive wire in substantially parallel relation to the conductive plate.
4. A precipitator according to claim 1, wherein the electrode which produces the corona discharge is a conductive pin located at right angles to the conductive plate.
5. A precipitator according to claim 1 wherein, the third duct includes a suction device.
6. A precipitator according to claim 1, including a fourth duct opposite to the second duct and said fourth duct having a device for varying the opening of said duct.
7. A precipitator according to claim 1 wherein said conductive plate is connected to a measuring apparatus.
8. A precipitator according to claim 1 including a cleaning system for said conductive plate.
US00316522A 1971-12-31 1972-12-19 Electrostatic precipitator for the collection of particles contained in a gas Expired - Lifetime US3827217A (en)

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US3986111A (en) * 1974-12-24 1976-10-12 The United States Of America As Represented By The Secretary Of The Navy Inverted voltage Gerdien Condenser
US4338568A (en) * 1980-03-28 1982-07-06 Nasa Method and device for detection of a substance
US4376637A (en) * 1980-10-14 1983-03-15 California Institute Of Technology Apparatus and method for destructive removal of particles contained in flowing fluid
US4693733A (en) * 1986-09-09 1987-09-15 Kankyo Company Limited Air cleaner
USRE33927E (en) * 1985-11-08 1992-05-19 Kankyo Company Limited Air cleaner
US5439513A (en) * 1992-05-29 1995-08-08 Research Triangle Institute Device for focussing particles suspended in a gas stream
US6752003B2 (en) * 2000-05-02 2004-06-22 Dr. Foedisch Umweltmesstechnik Gmbh Method and device for the extractive triboelectric measurements of dust and aerosols in streaming gases
US20040151672A1 (en) * 2001-07-23 2004-08-05 Matsushita Electric Industrial Co., Ltd. Particle counting method and particle counter
US6773674B2 (en) * 1999-01-25 2004-08-10 University Of Massachusetts Thermal analysis for detection and identification of explosives and other controlled substances
US6964189B2 (en) 2004-02-25 2005-11-15 Westinghouse Savannah River Company, Llc Portable aerosol contaminant extractor
US20110072887A1 (en) * 2009-06-02 2011-03-31 Panasonic Corporation Method for detecting a chemical substance
US20110238348A1 (en) * 2008-12-05 2011-09-29 Michael Klockner Test installation for electrical filters
US20190039076A1 (en) * 2015-09-08 2019-02-07 Rutgers, The State University Of New Jersey Personal Electrostatic Bioaerosol Sampler with High Sampling Flow Rate
US20220176384A1 (en) * 2019-04-09 2022-06-09 Technische Universität Dortmund Electrostatic precipitator

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Cited By (18)

* Cited by examiner, † Cited by third party
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US3986111A (en) * 1974-12-24 1976-10-12 The United States Of America As Represented By The Secretary Of The Navy Inverted voltage Gerdien Condenser
US4338568A (en) * 1980-03-28 1982-07-06 Nasa Method and device for detection of a substance
US4376637A (en) * 1980-10-14 1983-03-15 California Institute Of Technology Apparatus and method for destructive removal of particles contained in flowing fluid
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
US5439513A (en) * 1992-05-29 1995-08-08 Research Triangle Institute Device for focussing particles suspended in a gas stream
US6773674B2 (en) * 1999-01-25 2004-08-10 University Of Massachusetts Thermal analysis for detection and identification of explosives and other controlled substances
US6752003B2 (en) * 2000-05-02 2004-06-22 Dr. Foedisch Umweltmesstechnik Gmbh Method and device for the extractive triboelectric measurements of dust and aerosols in streaming gases
US20040151672A1 (en) * 2001-07-23 2004-08-05 Matsushita Electric Industrial Co., Ltd. Particle counting method and particle counter
US7145320B2 (en) * 2001-07-23 2006-12-05 Matsushita Electric Industrial Co., Ltd. Particle counting method and particle counter
US6964189B2 (en) 2004-02-25 2005-11-15 Westinghouse Savannah River Company, Llc Portable aerosol contaminant extractor
US20110238348A1 (en) * 2008-12-05 2011-09-29 Michael Klockner Test installation for electrical filters
US8756034B2 (en) * 2008-12-05 2014-06-17 Siemens Aktiengesellschaft Test installation for electrical filters
US20110072887A1 (en) * 2009-06-02 2011-03-31 Panasonic Corporation Method for detecting a chemical substance
US8056395B2 (en) 2009-06-02 2011-11-15 Panasonic Corporation Method for detecting a chemical substance
US20190039076A1 (en) * 2015-09-08 2019-02-07 Rutgers, The State University Of New Jersey Personal Electrostatic Bioaerosol Sampler with High Sampling Flow Rate
US10919047B2 (en) * 2015-09-08 2021-02-16 Rutgers, The State University Of New Jersey Personal electrostatic bioaerosol sampler with high sampling flow rate
US20220176384A1 (en) * 2019-04-09 2022-06-09 Technische Universität Dortmund Electrostatic precipitator

Also Published As

Publication number Publication date
FR2165801A1 (en) 1973-08-10
DE2264036A1 (en) 1973-07-12
JPS4875094A (en) 1973-10-09
DE2264036B2 (en) 1976-07-01
GB1378029A (en) 1974-12-18
FR2165801B1 (en) 1974-08-30
IT976339B (en) 1974-08-20
BE792785A (en) 1973-03-30

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