EP1024882A1 - Dispositif de traitement de gaz au plasma - Google Patents

Dispositif de traitement de gaz au plasma

Info

Publication number
EP1024882A1
EP1024882A1 EP98946619A EP98946619A EP1024882A1 EP 1024882 A1 EP1024882 A1 EP 1024882A1 EP 98946619 A EP98946619 A EP 98946619A EP 98946619 A EP98946619 A EP 98946619A EP 1024882 A1 EP1024882 A1 EP 1024882A1
Authority
EP
European Patent Office
Prior art keywords
electrode
further characterised
insulating
support
electrodes
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.)
Withdrawn
Application number
EP98946619A
Other languages
German (de)
English (en)
Inventor
David Michael Weeks
David Leslie Segal
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Accentus Medical PLC
Original Assignee
AEA Technology PLC
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 AEA Technology PLC filed Critical AEA Technology PLC
Publication of EP1024882A1 publication Critical patent/EP1024882A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/34—Chemical or biological purification of waste gases
    • B01D53/92—Chemical or biological purification of waste gases of engine exhaust gases
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/32—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by electrical effects other than those provided for in group B01D61/00
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J19/00—Chemical, physical or physico-chemical processes in general; Their relevant apparatus
    • B01J19/08—Processes employing the direct application of electric or wave energy, or particle radiation; Apparatus therefor
    • B01J19/087—Processes employing the direct application of electric or wave energy, or particle radiation; Apparatus therefor employing electric or magnetic energy
    • B01J19/088—Processes employing the direct application of electric or wave energy, or particle radiation; Apparatus therefor employing electric or magnetic energy giving rise to electric discharges
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J2219/00—Chemical, physical or physico-chemical processes in general; Their relevant apparatus
    • B01J2219/08—Processes employing the direct application of electric or wave energy, or particle radiation; Apparatus therefor
    • B01J2219/0894—Processes carried out in the presence of a plasma

Definitions

  • the present invention relates to devices for the processing of gaseous media by means of plasmas, and more particularly, to such devices in which one electrode is positioned axially within another electrode.
  • Such devices in particular for use in the treatment of exhaust gases from an internal combustion engine, operate in a very harsh environment.
  • Hitherto ceramic materials such as alumina have been used to make the support plates and although these are satisfactory in so far as their chemical inertness and insulating properties are concerned, they are brittle and prone to fracture.
  • an apparatus for the processing of gaseous media by means of a plasma wherein there is included at least one electrode which is maintained in position in relation to another by one or more insulating support structures made of a micaceous glass material.
  • the micaceous glass material is that manufactured by Morgan Matroc Limited, a subsidiary of the Morgan Crucible Company, under the Trade Mark MICATHERM.
  • the electrode or a metal attachment member therefor is secured to a said insulating support by in situ moulding of the support material on to the said electrode or metal attachment member.
  • insulating supports and electrodes attached thereto directly or via metal attachment members can be formed as a self supporting removable and replaceable unit.
  • a pair of insulating supports and a pair of electrodes define a space therebetween which is filled with pellets of active material.
  • a reactor 1 for removing pollutants, such as NO ⁇ or carbonaceous combustion products, from the exhaust from an internal combustion engine consists of a cylindrical stainless steel chamber 2 which has an inlet stub 3 and an outlet stub 4 by means of which it can be connected into the exhaust system of an internal combustion engine.
  • the chamber 2 is arranged, in use, to be connected to an earthing point 5.
  • Perforated inner and outer cylindrical electrodes 6 and 14 respectively are positioned co-axially within the chamber 2 by means of two supports 7 and 8.
  • the outer electrode 14 is held at earth potential by connection (not shown) to the earthed chamber 2.
  • the upstream end of the inner electrode 6 is closed off and is arranged to be connected to a source 9 of a pulsed or continuous potential of the order of tens of kilovolts via an insulating feed through 10.
  • Packed within the space 11 formed between the outer electrode 14, the inner electrode 6 and the supports 7 and 8 is a bed of pellets, represented diagramatically at 12, of an active material consisting of or incorporating ferroelectric material such as barium titanate.
  • the upstream support 7 has a series of apertures 13 formed in it whereas the support 8 is impermeable. The exhaust gases therefore are constrained to flow through the reactor 1 in the manner shown in the figure.
  • the selection of material composition of the pellets and the manner of operation of the reactor 1 are in this example based upon the considerations and examples described in our International Patent Application PCT/GB98/02569.
  • the supports 7 and 8 are made of a lead-based glass with a dispersion of mica in it.
  • the material which is marketed by Morgan Matroc Limited under the trade name MICATHERM is particularly suitable for the purposes of the present invention because not only does it have the required electrical properties and can withstand the operating environment of an internal combustion engine exhaust system, but it is resistant to thermal shock and can be formed readily into required shapes by moulding techniques.
  • each of the supports 7 and 8 is moulded onto a concentric pair of cylindrical metal stubs 71, 72 and 81, 82 respectively.
  • the stubs 71, 72 and 81, 82 are firmly fixed and sealed in the respective supports 7 and 8, and provide for attachment of the electrodes 6 and 14.
  • inner electrode 6 is of slightly larger radius than the stubs 71 and 81 so that it can be pushed onto these stubs and fixedly attached to them in any suitable manner (e.g. welding) .
  • Outer electrode 14 is similarly fixed on to stubs 72 and 82.
  • the complete set of components comprising the supports 7 and 8, the electrodes 6 and 14 and the pellet bed 12 form a self supporting removable and replaceable unit, conveniently referred to as a "cassette". Provision for filling, or refilling, with pellets may be made by incorporating one or more removable plugs (not shown) in the support 7 and/or support 8.
  • the feed through 10 need not necessarily be positioned on the side of the chamber 2 but may be positioned to extend through an end wall.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Analytical Chemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Health & Medical Sciences (AREA)
  • Biomedical Technology (AREA)
  • Environmental & Geological Engineering (AREA)
  • Combustion & Propulsion (AREA)
  • General Health & Medical Sciences (AREA)
  • Toxicology (AREA)
  • Organic Chemistry (AREA)
  • Physical Or Chemical Processes And Apparatus (AREA)
  • Exhaust Gas After Treatment (AREA)

Abstract

L'invention concerne un appareil (1) de traitement de milieux gazeux au moyen de plasma, au moins une électrode (16, 14) étant maintenue dans une position par rapport à une autre électrode par une ou plusieurs structures de support isolantes (7, 8) formées d'une matière de verre micacée.
EP98946619A 1997-10-22 1998-10-09 Dispositif de traitement de gaz au plasma Withdrawn EP1024882A1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
GBGB9722173.3A GB9722173D0 (en) 1997-10-22 1997-10-22 Plasma gas processing device
GB9722173 1997-10-22
PCT/GB1998/003059 WO1999020373A1 (fr) 1997-10-22 1998-10-09 Dispositif de traitement de gaz au plasma

Publications (1)

Publication Number Publication Date
EP1024882A1 true EP1024882A1 (fr) 2000-08-09

Family

ID=10820830

Family Applications (1)

Application Number Title Priority Date Filing Date
EP98946619A Withdrawn EP1024882A1 (fr) 1997-10-22 1998-10-09 Dispositif de traitement de gaz au plasma

Country Status (6)

Country Link
EP (1) EP1024882A1 (fr)
JP (1) JP2001520109A (fr)
KR (1) KR20010031254A (fr)
AU (1) AU9361598A (fr)
GB (1) GB9722173D0 (fr)
WO (1) WO1999020373A1 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB0015952D0 (en) 2000-06-30 2000-08-23 Aea Technology Plc Plasma assisted reactor
JP2002239344A (ja) * 2001-02-19 2002-08-27 Fujitsu Ltd ガス処理装置と方法
GB0107020D0 (en) 2001-03-21 2001-05-09 Aea Technology Plc A reactor for plasma assisted treatment of gaseous media

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3983021A (en) * 1971-06-09 1976-09-28 Monsanto Company Nitrogen oxide decomposition process
US3925673A (en) * 1973-03-12 1975-12-09 Jr Joseph E Wright Apparatus for generating heavy oxygen molecules
US3916057A (en) * 1973-08-31 1975-10-28 Minnesota Mining & Mfg Intumescent sheet material
US4954320A (en) * 1988-04-22 1990-09-04 The United States Of America As Represented By The Secretary Of The Army Reactive bed plasma air purification
JPH038412A (ja) * 1989-06-07 1991-01-16 Sachiko Okazaki 放電法による排気ガスのＮＯｘ除去方法
AU672829B2 (en) * 1992-10-14 1996-10-17 Novozone Limited Ozone generation apparatus and method
US5466424A (en) * 1992-12-28 1995-11-14 Bridgestone Corporation Corona discharge surface treating method
US5609736A (en) * 1995-09-26 1997-03-11 Research Triangle Institute Methods and apparatus for controlling toxic compounds using catalysis-assisted non-thermal plasma

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO9920373A1 *

Also Published As

Publication number Publication date
GB9722173D0 (en) 1997-12-17
WO1999020373A1 (fr) 1999-04-29
JP2001520109A (ja) 2001-10-30
AU9361598A (en) 1999-05-10
KR20010031254A (ko) 2001-04-16

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