WO1995007759A1 - Dispositif pour filtre electrostatique et installation comprenant au moins un dispositif de ce type - Google Patents

Dispositif pour filtre electrostatique et installation comprenant au moins un dispositif de ce type Download PDF

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Publication number
WO1995007759A1
WO1995007759A1 PCT/SE1994/000740 SE9400740W WO9507759A1 WO 1995007759 A1 WO1995007759 A1 WO 1995007759A1 SE 9400740 W SE9400740 W SE 9400740W WO 9507759 A1 WO9507759 A1 WO 9507759A1
Authority
WO
WIPO (PCT)
Prior art keywords
plates
plate
casing
installation
air
Prior art date
Application number
PCT/SE1994/000740
Other languages
English (en)
Inventor
Ulf HÖRNQUIST
Göran WIKSTRÖM
Original Assignee
Purocell S.A.
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
Application filed by Purocell S.A. filed Critical Purocell S.A.
Priority to AU77120/94A priority Critical patent/AU7712094A/en
Publication of WO1995007759A1 publication Critical patent/WO1995007759A1/fr

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
    • B03C3/017—Combinations of electrostatic separation with other processes, not otherwise provided for
    • 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
    • B03C3/01—Pretreatment of the gases prior to electrostatic precipitation
    • B03C3/011—Prefiltering; Flow controlling
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03C—MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03C3/00—Separating dispersed particles from gases or vapour, e.g. air, by electrostatic effect
    • B03C3/02—Plant or installations having external electricity supply
    • B03C3/04—Plant or installations having external electricity supply dry type
    • B03C3/12—Plant or installations having external electricity supply dry type characterised by separation of ionising and collecting stations
    • 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
    • B03C3/40—Electrode constructions
    • B03C3/60—Use of special materials other than liquids

Definitions

  • Device for an electrostatic filter comprising at least one such device
  • the present invention relates to a device for an electrostatic filter for separation of particles.
  • the device comprises a particle-charging unit and a particle- collecting unit.
  • Such devices are known in the art.
  • the invention also relates to an installation comprising such a device.
  • Conventional air cleaners comprise filters with an ionizing sector in which the particles present in the air flowing through the air cleaner are ionized, i.e. acquire an electric charge.
  • the particles then pass through a particle-collecting unit where the charged particles interact with an electric field created by plates which are charged with the opposite electric . charge. In so doing, the particles are driven towards the plates and collide with the plates and are collected.
  • the Swedish patent SE-B-401 327 relates to an electrostatic filter which comprises wires and plates of different electric potentials, the particles charged by the wires being attracted to and adhering to the said plates, which have reversed polarity compared to the particles charged by means of the wires.
  • an insulating plate Arranged between each plate is an insulating plate intended to prevent flash-over between the electrically charged plates, especially on account of the build-up of layers of the particles attracted to the plates.
  • the chief disadvantage of such a filter is that a great many plates - both charged plates and insulating plates - have to be used in order to achieve a suitable overall filter surface.
  • Another important disadvantage is that after a relatively short period of time the filter loses much of its effectiveness and its ability to pick up particles. As a result, the filter must be cleaned at relatively short intervals, which is often laborious and time- consuming work.
  • SE-A-71143309 Another type of device is shown in SE-A-71143309 (372 180) .
  • the collecting elements consist of a network of paper, metal-coated if appropriate, and are earthed.
  • the paper in the network has a low conductivity.
  • paper used for this purpose has a major disadvantage in that it is hygroscopic, since paper, if it takes up moisture, changes its characteristics in respect of conductivity.
  • the object of the present invention is to provide an electrostatic filter device of the type mentioned in the introduction, and an installation having at least one such device, where the above entioned disadvantages are eliminated and where an extremely high degree of particle collection is maintained over a long period of use.
  • a further object of the invention is to provide a device or installation in which the filter is independent of charged control plates and any intermediate insulating plates, it being possible to increase the collector surface (pick-up surfaces for particles) within a given filter volume.
  • a further object is to be independent of the moisture content in the gaseous flow passing through the device.
  • a further object is to be able to produce the device in a simple and economic manner, and at the same time to make it easy to clean.
  • a further object is to improve the particle- collection capacity in the particle-collecting part.
  • the device according to the invention has a number of advantages. By virtue of the fact that the plates, and possibly also the casing around the plates, are earthed and are to be connected to each other, no insulating components are needed between the different parts. In addition, the whole device can be designed, if appropriate, in one piece by compression moulding.
  • the particles are charged by corona discharge in the particle-charging part and are thereafter discharged and collected in the fully or partly earthed particle-collecting part, this is the only place in the device where high voltage and/or voltage is/are required.
  • the particle-collecting part only earthing is required. In order for the particles to adhere to the plates, it is necessary that they be discharged in close contact to the plates and not be discharged at too great a distance from the plates.
  • the distance between the plates can be about 5 - 10 mm, for example, and preferably 5 - 8 mm.
  • soft-earthing or semi-conducting materials refer to the physical designation of materials having a volume resistivity of approximately 10 2 to 10 11 ⁇ cm.
  • Soft-earthing materials used in the invention are preferably plastic materials with suitable properties, for example polypropylene, polyethylene, macrolon or similar. These materials can be doped with charcoal powder, or this material can be provided in another suitable way with an admixture of substances known to the person skilled in the art in order to obtain the desired conductivity.
  • the plates with a variable resistivity such that one or more plates in the particle-collecting part has/have a resistivity which changes along the plate, from the edge nearest the corona wire to the opposite end of the plate, so that, for example, the plate nearest the corona wire has a zone of low resistivity, then an electrically insulating zone, and then once again an electrically conducting zone.
  • the reason for this is that, as a result of the induction effect from the corona wire, it should be possible to obtain an electric field of the desired appearance between certain plates, in order thereby to direct the charged particles.
  • Fig. 1 shows a device according to the invention, seen in perspective in the direction of flow of the stream.
  • Fig. 2 shows the same device in section, seen from the side.
  • Fig. 3 shows a section, in accordance with Fig. 2, through a further embodiment of the invention.
  • Fig. 4 shows a cross-section through a novel installation in which a device according to the invention is included.
  • Fig. 1 shows a device 101 according to the invention for an electrostatic filter.
  • the device 101 has an essentially parallelepipedal casing made of plastic or some other suitable semi-conducting material. This device is thus intended to be fitted in an electrostatic filter with a fan blower unit which forces the air, which is to be cleaned, to pass through the device.
  • the device consists of side walls 102, 103, 104 and 105. Plates 106 are arranged between the walls 102 and 104 of the short sides and essentially along the entire length of the long sides 103, 105.
  • the number of plates is, as the person skilled in the art will understand, a question of size which depends on the flow- through velocity, the flow magnitude and other parameters which can be tested by the person skilled in the art.
  • Several electrically conducting, elongate parts, preferably corona wires 110, are drawn in such a way that they pass through the casing in the longitudinal direction thereof and at a distance from the plates.
  • the walls 102 - 105 and the plates 106 are preferably made of plastic or a similar suitable semi- conducting material, preferably of the same material as the plates.
  • the device can either be injection-moulded in one piece or can be extruded in the form of parts. In the case where the parts for the device are extruded, the parts are assembled at a subsequent stage. In connection with the use of extruded parts, the plates and the casing can of course be made of different materials, should this be desired.
  • the plates in the device are to be earthed, and the casing too is preferably earthed.
  • the device thus formed is intended to be placed in an electrostatic filter and to form the actual filter unit thereof. Since, after a certain period of use, the device 101 no longer cleans in a satisfactory manner, the device must be replaced and/or cleaned. The interval between these replacements or this cleaning of the device depends on the environment in which the filter is set up.
  • Fig. 3 shows how, in a further embodiment, several corona wires are arranged parallel to each other, it being possible for an improvement to be made by allowing some of the plates to protrude further in the direction of the particle-charging part, so that in principle compartments are formed in the particle- collecting part which correspond to each corona wire.
  • the particles which are to be removed from the air flowing through the filter are charged, and the whole device except the wire or wires is earthed.
  • the whole device is earthed.
  • the charged particles will thus be discharged to earth and will be adsorbed onto the surfaces of the units or walls.
  • the filter described above is used with advantage in a novel installation in which a device according to the invention is included. This installation is intended for cleaning air in conjunction with an oxygen-cleaving unit.
  • Combinations of different filters in one unit are known in the art. These combinations are in most cases intended for some special application, and the components involved are then adapted to this application, for example in clean rooms for manufacturing products in the areas of medical or electronic production, where a high degree of cleanliness is sought. In these applications, the most important aspect is often a particle-free room, although the aim may of course be to separate gaseous products which arise during the manufacture or handling of the various products.
  • the installation shown in Fig. 4 comprises, in a casing 201, the following units:
  • an air inlet 202 Arranged at the far bottom is an air inlet 202 where the air which is to be cleaned is admitted.
  • the evacuation air that is the air which is to be cleaned, can of course be conveyed to the air inlet via ventilation channels (not shown) or the like.
  • a cooling unit can be arranged at the air inlet if the temperature of the air to be cleaned is to be lowered before the air is conveyed to the desired locality, which can be the same site from which the air was evacuated or some other site, for example a clean room to which air is to be conveyed which is to a ery large extent free of dust and yeast- ree.
  • Dehumidifiers may also be arranged here, since some of the filter units which can be placed in the device are sensitive to humidity, with a consequent drop in performance, and, as is known, when the temperature is lowered, the relative air humidity increases.
  • an electrostatic filter 203 which comprises at least one device 101, according to the invention, of the type described above.
  • the filter 203 can of course be made up of any chosen number of exchangeable devices 101. This filter separates out essentially all the particles present in the air.
  • a gas-adsorbing or gas-absorbing filter 204 which separates out gases such as ammonia, ethylene, ozone, formaldehyde, and other volatile gases occurring in various types of modern building materials.
  • the filter consists either of a carbon filter granulate or a granulate of ECP or comparable material.
  • ECP is a product consisting of high- grade, hydrated aluminium silicate, which is particularly effective in removing smoke and various odoriferous substances. These materials act by ion action, i.e. the EPC particles have an excess negative charge and attract and adsorb undesired gases. It is of course possible to use a combination of the two types of filtering granulates.
  • the two granulates are then preferably placed each in a separate cartridge, since, depending on the circumstances in each individual case, they may exhibit different degrees of fouling over the course of time, and one filter may need to be replaced more often than the other. It is of course also conceivable to mix the two materials together in the same cartridge, and then possibly in relation to the degree of efficiency of the two substances, so that the decline in the degree of efficiency of the two materials takes place gradually at the same rate.
  • a so-called soda lime filter 205 preferably in the form of a granulate, is placed above the filters consisting of granulate. This filter 205 has the known property of converting carbon dioxide which passes through the filter material, so that the carbon dioxide is split into carbon and oxygen, the carbon remaining in the filter and the oxygen accompanying the cleaned air out of the installation.
  • Fig. 4 shows, by means of arrows, an example of how the air is made to flow through the two units 204 and 205 arranged one above the other.
  • Separating walls 206 have been arranged at the top and bottom of the units in order to force the air to flow through the filter plates 207 and 208, respectively, arranged in the units.
  • Blower fans are arranged above the filters at 209 in order to force the air to pass into the installation for cleaning of the air. These blower fans of course also force the air to pass out of the device through the air outlet 210 arranged at the very top.
  • the embodiments described can of course be modified within the scope of the patent claims attached.
  • the whole installation can be arranged with air intake at the top and with air blown out at the bottom, and a horizontal arrangement of the filters in the abovementioned order is also a possibility.
  • the dimensions of both the device according to Figs. 1 - 3 and the installation according to Fig. 4 can be varied depending on the application.
  • the outer dimensions of the installation casing can be such that they are adapted to an existing ventilation system.
  • the various possible modified variants of the design naturally depend to a great extent on the expected application and the desired effects in terms of air flow and cleaning.

Landscapes

  • Electrostatic Separation (AREA)

Abstract

L'invention concerne un dispositif destiné à un filtre électrostatique de séparation de particules, le dispositif comprend une unité (110) de charge de particules agencée en amont et comportant au moins un fil à effet couronne destiné à charger les particules, et une unité (101) collectrice de particules agencée en aval de cette dernière, laquelle est au moins partiellement mise à la terre, l'unité collectrice de particules comprenant au moins une plaque (106, 106', 106'') agencée dans une enveloppe (102, 103, 104, 105), l'enveloppe et la plaque étant agencées pour présenter sensiblement le même potentiel électrique par rapport au fil à effet couronne, de préférence mis à la terre, le matériau de l'enveloppe (102, 103, 104, 105) et la plaque (106, 106', 106'') comprenant chacun un matériau non hygroscopique de haute résistivité, correspondant essentiellement à la résistivité volumique d'un matériau dit de mise à la terre doux. L'invention concerne également une installatiion comprenant le dispositif.
PCT/SE1994/000740 1993-09-17 1994-08-12 Dispositif pour filtre electrostatique et installation comprenant au moins un dispositif de ce type WO1995007759A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU77120/94A AU7712094A (en) 1993-09-17 1994-08-12 Device for an electrostatic filter, and installation comprising at least one such device

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE9303059A SE9303059D0 (sv) 1993-09-17 1993-09-17 Anordning vid ett elektrostatiskt filter och en anläggning innefattande åtminstone en sådan anordning
SE9303059-1 1993-09-17

Publications (1)

Publication Number Publication Date
WO1995007759A1 true WO1995007759A1 (fr) 1995-03-23

Family

ID=20391153

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/SE1994/000740 WO1995007759A1 (fr) 1993-09-17 1994-08-12 Dispositif pour filtre electrostatique et installation comprenant au moins un dispositif de ce type

Country Status (3)

Country Link
AU (1) AU7712094A (fr)
SE (1) SE9303059D0 (fr)
WO (1) WO1995007759A1 (fr)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1996024437A1 (fr) * 1995-02-08 1996-08-15 Purocell S.A. Filtre electrostatique et dispositif d'alimentation en air
WO1997009117A1 (fr) * 1995-09-08 1997-03-13 Strainer Lpb Aktiebolag Precipitateur electrostatique permettant de purifier l'air d'aerosols ayant une charge electrique
US9682345B2 (en) 2014-07-08 2017-06-20 Particle Measuring Systems, Inc. Method of treating a cleanroom enclosure
WO2017149193A1 (fr) * 2016-03-04 2017-09-08 Aavi Technologies Ltd Purificateur d'air
EP3781323A4 (fr) * 2018-04-18 2022-01-05 Eurus Airtech AB Éléments électrode à haute résistivité pour électrofiltre à deux étages

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2234179A1 (de) * 1971-07-28 1973-02-08 Braun Ag Elektrostatisches filter
DE2343900A1 (de) * 1973-08-31 1975-03-27 Metallgesellschaft Ag Kunststoffelektrofilter
EP0084572A1 (fr) * 1981-07-31 1983-08-03 IBBOTT, Jack Kenneth Epurateur d'air electrostatique

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2234179A1 (de) * 1971-07-28 1973-02-08 Braun Ag Elektrostatisches filter
DE2343900A1 (de) * 1973-08-31 1975-03-27 Metallgesellschaft Ag Kunststoffelektrofilter
EP0084572A1 (fr) * 1981-07-31 1983-08-03 IBBOTT, Jack Kenneth Epurateur d'air electrostatique

Non-Patent Citations (3)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN, Vol. 10, No. 373, C-391; & JP,A,61 164 664 (MATSUSHITA ELECTRIC IND CO LTD), 25 July 1986. *
PATENT ABSTRACTS OF JAPAN, Vol. 11, No. 371, C-462; & JP,A,62 144 768 (MITSUBISHI HEAVY IND LTD), 27 June 1987. *
PATENT ABSTRACTS OF JAPAN, Vol. 14, No. 446, C-763; & JP,A,02 174 951 (DAIKIN IND LTD), 6 July 1990. *

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1996024437A1 (fr) * 1995-02-08 1996-08-15 Purocell S.A. Filtre electrostatique et dispositif d'alimentation en air
AU705254B2 (en) * 1995-02-08 1999-05-20 Purocell S.A. Electrostatic filter and supply air terminal
US6090189A (en) * 1995-02-08 2000-07-18 Purocell S.A. Electrostatic filter and supply air terminal
US6241810B1 (en) 1995-02-08 2001-06-05 Purocell S.A. Electrostatic filter and supply air terminal
WO1997009117A1 (fr) * 1995-09-08 1997-03-13 Strainer Lpb Aktiebolag Precipitateur electrostatique permettant de purifier l'air d'aerosols ayant une charge electrique
US6117216A (en) * 1995-09-08 2000-09-12 Strainer Lpb Aktiebolag Precipitator for cleaning of air from electrically charged aerosols
US9682345B2 (en) 2014-07-08 2017-06-20 Particle Measuring Systems, Inc. Method of treating a cleanroom enclosure
US9808760B2 (en) 2014-07-08 2017-11-07 Particle Measuring Systems, Inc. Active filtration system for controlling cleanroom environments
WO2017149193A1 (fr) * 2016-03-04 2017-09-08 Aavi Technologies Ltd Purificateur d'air
EP3781323A4 (fr) * 2018-04-18 2022-01-05 Eurus Airtech AB Éléments électrode à haute résistivité pour électrofiltre à deux étages

Also Published As

Publication number Publication date
SE9303059D0 (sv) 1993-09-17
AU7712094A (en) 1995-04-03

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