GB2330507A - Corona discharge reactors - Google Patents

Corona discharge reactors Download PDF

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Publication number
GB2330507A
GB2330507A GB9721776A GB9721776A GB2330507A GB 2330507 A GB2330507 A GB 2330507A GB 9721776 A GB9721776 A GB 9721776A GB 9721776 A GB9721776 A GB 9721776A GB 2330507 A GB2330507 A GB 2330507A
Authority
GB
United Kingdom
Prior art keywords
corona discharge
electrode
reactor
electrodes
inner electrode
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Withdrawn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
GB9721776A
Other versions
GB9721776D0 (en
Inventor
John Sydney Carlow
Keith Howard Bayliss
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.)
Ricardo AEA Ltd
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
Priority to GB9721776A priority Critical patent/GB2330507A/en
Publication of GB9721776D0 publication Critical patent/GB9721776D0/en
Publication of GB2330507A publication Critical patent/GB2330507A/en
Withdrawn legal-status Critical Current

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Classifications

    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
    • C01B13/00—Oxygen; Ozone; Oxides or hydroxides in general
    • C01B13/10—Preparation of ozone
    • C01B13/11—Preparation of ozone by electric discharge
    • 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
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B7/00—Heating by electric discharge
    • H05B7/16—Heating by glow discharge
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05H—PLASMA TECHNIQUE; PRODUCTION OF ACCELERATED ELECTRICALLY-CHARGED PARTICLES OR OF NEUTRONS; PRODUCTION OR ACCELERATION OF NEUTRAL MOLECULAR OR ATOMIC BEAMS
    • H05H1/00—Generating plasma; Handling plasma
    • H05H1/24—Generating plasma
    • H05H1/2406—Generating plasma using dielectric barrier discharges, i.e. with a dielectric interposed between the electrodes
    • H05H1/2443—Generating plasma using dielectric barrier discharges, i.e. with a dielectric interposed between the electrodes the plasma fluid flowing through a dielectric tube
    • H05H1/245—Generating plasma using dielectric barrier discharges, i.e. with a dielectric interposed between the electrodes the plasma fluid flowing through a dielectric tube the plasma being activated using internal electrodes
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05H—PLASMA TECHNIQUE; PRODUCTION OF ACCELERATED ELECTRICALLY-CHARGED PARTICLES OR OF NEUTRONS; PRODUCTION OR ACCELERATION OF NEUTRAL MOLECULAR OR ATOMIC BEAMS
    • H05H1/00—Generating plasma; Handling plasma
    • H05H1/24—Generating plasma
    • H05H1/47—Generating plasma using corona discharges

Landscapes

  • Physics & Mathematics (AREA)
  • Plasma & Fusion (AREA)
  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Health & Medical Sciences (AREA)
  • Toxicology (AREA)
  • General Health & Medical Sciences (AREA)
  • Inorganic Chemistry (AREA)
  • Fluid Mechanics (AREA)
  • Physical Or Chemical Processes And Apparatus (AREA)

Abstract

A reactor for the processing of gaseous media has a cylindrical chamber with an axial inner electrode and a coaxial outer electrode. The ratio between the diameters of the two electrodes lies in the range 2.7 (or e) +/- 20%, to reduce the effect of variations in the separation between the electrodes.

Description

Corona Discharae Reactors The present invention relates to corona discharge reactors for the processing of gaseous media, and more particularly to the type of corona discharge reactor consisting of a cylindrical chamber having an axial electrode surrounded by a coaxial outer electrode. See, for example, our earlier patent GB 2 282 738.
The radial distribution of the electric field between the electrodes of such a corona discharge reactor is a function of a number of parameters, including the separation between the electrodes. In general, the field distribution is a saddle-shaped curve the shape of which is sensitive to localised variations in the separation between the electrodes. Localised rapid changes in the electric field can lead to the breakdown of the corona discharge and the formation of arcs, which not only can overload the power supply to the reactor concerned but do not act in the same way as corona discharges so far as the processing of the gaseous media is concerned.
It is an object of the present invention to provide a corona discharge reactor of the type described, for the processing of gaseous media, in which the sensitivity of the maintenance of the corona discharge to variations in the separation between the electrodes is reduced.
According to the present invention there is provided a reactor for the processing of gaseous media, including a cylindrical reactor chamber having an axial inner electrode and an outer electrode coaxial with the inner electrode, wherein the ratio between the diameters of the outer and inner electrodes lies in the range 2.7 + 20%.
If either of the electrodes has radial projections thereon, as do those of the reactor disclosed in our earlier patent GB 2 282 738, the diameter of the envelope of the ends of the projections on the electrode is considered as the diameter of that electrode.
The invention will now be described, by way of example, with reference to the accompanying drawing which is a diagrammatic longitudinal section of a corona discharge reactor embodying the invention.
Referring to the drawing, a corona discharge reactor for the processing of gaseous media comprises a cylindrical reactor chamber 1 which has an inlet port 2 for a gaseous medium to be processed and an outlet port 3 for the gaseous medium. Positioned axially within the chamber 1 by means of insulating spiders 4 is an inner electrode 5 in the form of a rod 6 which has radial projections 7 formed thereon. The inner electrode 5 is connected to a high voltage power supply 8 which is capable of producing fast rise time pulses having a voltage of 100 kV, a duration of 100 nanoseconds and a repetition frequency of 100 Hz to 500 Hz. An earthed outer electrode 9 surrounds the inner electrode 5. The outer electrode 9 has radial projections 10 formed thereon which are opposite those formed on the inner electrode 5.
The ratio between the inner diameter of the outer electrode 9, as measured from the envelope of the projections 10 on the outer electrode 9, to that of the inner electrode 5, as measured from the envelope of the projections 7 on the inner electrode 5, is equal ideally to the mathematical constant e-, although values of up to + 20% from this value are effective.
In this example the inner electrode 5 has a diameter 50 mm and the inner diameter of the outer electrode is 136 mm. However, it will be appreciated that larger or smaller reactors can be constructed whilst maintaining the required ratio of electrode diameters.

Claims (3)

  1. Claims 1. A reactor for the processing of gaseous media, including a cylindrical reactor chamber having an axial inner electrode and an outer electrode coaxial with the inner electrode, wherein the ratio between the diameters of the outer and inner electrodes lies in the range 2.7 + 20%.
  2. 2. A corona discharge reactor according to Claim 1 wherein the ratio of the diameters of the outer and inner electrodes is 2.7.
  3. 3. A corona discharge reactor substantially as hereinbefore described and with reference to the accompanying drawing.
GB9721776A 1997-10-15 1997-10-15 Corona discharge reactors Withdrawn GB2330507A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB9721776A GB2330507A (en) 1997-10-15 1997-10-15 Corona discharge reactors

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB9721776A GB2330507A (en) 1997-10-15 1997-10-15 Corona discharge reactors

Publications (2)

Publication Number Publication Date
GB9721776D0 GB9721776D0 (en) 1997-12-10
GB2330507A true GB2330507A (en) 1999-04-21

Family

ID=10820545

Family Applications (1)

Application Number Title Priority Date Filing Date
GB9721776A Withdrawn GB2330507A (en) 1997-10-15 1997-10-15 Corona discharge reactors

Country Status (1)

Country Link
GB (1) GB2330507A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2012178201A1 (en) * 2011-06-24 2012-12-27 Jtw, Llc Advanced nano technology for growing metallic nano-clusters

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4656010A (en) * 1984-06-22 1987-04-07 Messer Griesheim Gmbh Device for producing ozone
US4834948A (en) * 1986-07-10 1989-05-30 E. M. Heinkel K.G. Device for enriching a fluid with ozone

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4656010A (en) * 1984-06-22 1987-04-07 Messer Griesheim Gmbh Device for producing ozone
US4834948A (en) * 1986-07-10 1989-05-30 E. M. Heinkel K.G. Device for enriching a fluid with ozone

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2012178201A1 (en) * 2011-06-24 2012-12-27 Jtw, Llc Advanced nano technology for growing metallic nano-clusters
US8753488B2 (en) 2011-06-24 2014-06-17 Jtw, Llc Advanced nano technology for growing metallic nano-clusters
US9446372B2 (en) 2011-06-24 2016-09-20 Jtw, Llc. Advanced nano technology for growing metallic nano-clusters

Also Published As

Publication number Publication date
GB9721776D0 (en) 1997-12-10

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Legal Events

Date Code Title Description
WAP Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1)