GB2287630A - Apparatus and method for treatment of gas by ionization - Google Patents

Apparatus and method for treatment of gas by ionization Download PDF

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Publication number
GB2287630A
GB2287630A GB9404904A GB9404904A GB2287630A GB 2287630 A GB2287630 A GB 2287630A GB 9404904 A GB9404904 A GB 9404904A GB 9404904 A GB9404904 A GB 9404904A GB 2287630 A GB2287630 A GB 2287630A
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United Kingdom
Prior art keywords
gas
circuit
electrical
ionization device
frequency
Prior art date
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Application number
GB9404904A
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GB9404904D0 (en
Inventor
Jong Johannes De
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ADVANCED ENERGY SYSTEMS
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ADVANCED ENERGY SYSTEMS
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Priority to GB9404904A priority Critical patent/GB2287630A/en
Publication of GB9404904D0 publication Critical patent/GB9404904D0/en
Publication of GB2287630A publication Critical patent/GB2287630A/en
Withdrawn legal-status Critical Current

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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
    • B01D53/94—Chemical or biological purification of waste gases of engine exhaust gases by catalytic processes
    • B01D53/9445—Simultaneously removing carbon monoxide, hydrocarbons or nitrogen oxides making use of three-way catalysts [TWC] or four-way-catalysts [FWC]
    • B01D53/9454—Simultaneously removing carbon monoxide, hydrocarbons or nitrogen oxides making use of three-way catalysts [TWC] or four-way-catalysts [FWC] characterised by a specific device
    • 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
    • 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
    • B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
    • B01D53/86—Catalytic processes
    • B01D53/8643—Removing mixtures of carbon monoxide or hydrocarbons and nitrogen oxides
    • B01D53/8646—Simultaneous elimination of the components
    • B01D53/8653—Simultaneous elimination of the components characterised by a specific device
    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
    • F01N3/0892—Electric or magnetic treatment, e.g. dissociation of noxious components
    • 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
    • B01J2219/0803—Processes employing the direct application of electric or wave energy, or particle radiation; Apparatus therefor employing electric or magnetic energy
    • B01J2219/0805—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
    • B01J2219/0845—Details relating to the type of discharge
    • B01J2219/0849—Corona pulse discharge
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2570/00—Exhaust treating apparatus eliminating, absorbing or adsorbing specific elements or compounds
    • F01N2570/04—Sulfur or sulfur oxides
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2570/00—Exhaust treating apparatus eliminating, absorbing or adsorbing specific elements or compounds
    • F01N2570/14—Nitrogen oxides
    • 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
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/10—Internal combustion engine [ICE] based vehicles
    • Y02T10/12—Improving ICE efficiencies

Abstract

Apparatus 1 for treating a gas to remove gaseous contaminants therefrom, comprising an ionization device 2 and a stabilizing device 3 connected in series and through which gas to be treated flows, wherein the ionization device 2 comprises a corona producing circuit 4 and a pulsed circuit 5 electrically connected to provide substantial electrical resonance in use. The power supplies to such circuits 4, 5 are completely constructed in solid state technology, and provide in the circuit high voltage impulses with short rise to peak times and a pulse frequency which is variable in the range 0-6000 Hz, in the preferred embodiment the frequency being in the range 60-6000 Hz. <IMAGE>

Description

APPARATUS AND METHOD FOR TREATMENT OF GAS The invention relates to an apparatus and a method for treatment of gas, particularly gaseous streams or flows.
The efficient destruction of gas and vapour molecules of pollutant compounds and the efficient destruction of air-borne bacteria are of major importance to the populace and the environment.
For example, plant and equipment which rely upon a combustion process for operation will, as a consequence of that combustion process, emit both gaseous and vapour phase compounds from or through an exhaust system, usually to atmosphere. Many if not all of these emitted compounds are known to be harmful to the health of the populace and damaging to the environment. As a further example, motor vehicles emit compounds in gaseous and vapour form from their exhaust systems which contain such compounds as oxides of carbon, oxides of nitrogen and short chain and long chain hydrocarbons, in both gas and vapour forms. Such compounds are harmful both to the health of the populace and to the environment in general.
Systems have been developed which seek electrically to act on gaseous pollutants whereby to convert those having a relatively complex molecular structure to a relatively simple structure. However, such prior systems have difficulty with the development of a reliable and efficient high voltage power supply.
It is an object of the invention to seek to mitigate this disadvantage.
According to the invention there is provided apparatus for treating a gas to remove gaseous contaminants therefrom, comprising an ionization device and a stabilizing device connected in series and through which gas to be treated flows, wherein the ionization device comprises a corona producing circuit and a pulsed circuit electrically connected to provide substantial electrical resonance in use.
The ionization device may comprise a substantially cylindrical body and an internally mounted corona discharge means. This is a relatively simple yet efficient construction.
The corona discharge means may comprise a wire which may extend longitudinally of the cylindrical body.
The wire may comprise a copper wire extending axially of the body. This provides an efficient corona, particularly where the wire and cylindrical body may have substantially the same length.
The cylindrical body may comprise an aluminium tube.
The stabilizing device may comprise a plurality of spaced apart substantially parallel plates.
Suitably there may be six plates. This provides a readily constructible and manageable pack of plates.
The electrical circuits may comprise a DC supply and a pulse generator the frequency of which may be variable between 0 and 6000 Hz, particularly in the range 60-6000 Hz, per second.
The pulse generator may be adapted to provide pulses with a pulse rise time of < 1 CL S and amplitude of < 40 y S.
The circuits may comprise solid state circuits.
According to a second aspect of the invention there is provided a method of treating a gas to remove gaseous contaminants therefrom, comprising providing an ionization device and a stabilizing device in series, providing electrical circuits to produce respective electrical charges at each device and providing an electrical charge at the ionizing device which is a corona discharge and a pulsed circuit in substantial resonance, and passing the gas serially through the ionization device and stabilizing device.
According to a third aspect of the invention there is provided an electrical circuit for producing high voltage impulses with short peak rise times and a pulse frequency variable between 0 and 6000 Hz, comprising a high voltage transformer having a plurality of identical units formed in series.
Apparatus for treating a gas, and a method utilizing the apparatus, are hereinafter described, by way of example, with reference to the accompanying drawings.
Fig. 1 shows a schematic side view of apparatus according to the invention; Fig. 2 is a schematic layout circuit of a high voltage generator used in the invention; Fig. 2A shows a graph of current against time for voltage generation in an ionization device of the apparatus of Fig. 1; Fig. 3 shows schematically an electrical circuit for generating a DC voltage in the ionization device of Fig. 1; Fig. 4 shows schematically an electrical circuit for generating a DC pulse voltage as the ionization device of Fig. 1; Fig. 5 shows a circuit for producing a DC voltage according to the invention; Fig. 6 shows an electrical circuit for producing a pulse DC voltage with a frequency of 60-6000 Hz; Fig. 7 shows an electrical circuit for producing high DC voltage current pulses; and Fig. 8 shows a sectional view of a transformer for transforming DC current to AC current at a desired frequency.
Referring to the drawings, there is shown apparatus 1 for treating a gas to remove gaseous contaminants therefrom, comprising an ionization device 2 and a stabilizing device 3 connected in series and through which gas to be treated flows, wherein the ionization device 2 comprises a corona producing circuit 4 and a pulsed circuit 5 electrically connected to provide substantial electrical resonance in use.
The power supplies to such circuits 4, 5 are completely constructed in solid state technology, and provide in the circuit high voltage impulses with short rise to peak times and a pulse frequency which is variable in the range 0-6000 Hz, in the preferred embodiment the frequency being in the range 60-6000 Hz. In these circuits the circuit for producing a corona in the ionization device 2 and a transformer 6 (Fig. 8) providing the pulsed circuit are in resonance, thus providing a maximum energy transfer to the gas so that the gaseous containments are disassociated into innocuous molecules.
The ionization device 2 comprises a cylindrical body in the form of a tube 7, in the embodiment illustrated made of aluminium, with an internal corona discharge means in the form of a metal wire 8 which in the embodiment illustrated is a smooth copper wire mounted axially of the aluminium tube 7 and is of identical length thereto.
The corona wire 8 has an applied pulsing voltage of 20 V DC applied it on which is superimposed, and in resonance therewith, a voltage of 20 kV DC which is applied to the cylinder. Typical parameters for the ionization device are:
Corona wire 8 : diameter [mm] 0,2 length [mm] 120 Cylinder 7 : diameter (inside) [mm] 80 length [mm] 120 Bias voltage : [kV] 0-20 Pulsing : DC voltage [Kv] 0-20 rise time [ijs] 1 pulse duration [ps] 40 The downstream (as considered in gas flow direction use) end of the aluminium tube 7 opens via a flared entry 9 into the stabilizing device 3, which comprises a plurality of spaced plates 10, six in the embodiment, which are mounted to lie in planes substantially parallel to the gas flow direction and across which a voltage of, in the embodiment, 36 kV DC is applied, though the applied voltage can be in the range 0-50 kV. The voltage applied to the stabilizing device 3 comprises two solid state circuits connected in series.
Typical parameters for the stabilizing device 3 are:
Number of plates 10 : 6 size [mml : 300 x 250 inter plate distance [mml 40 voltage (kV] 0-40 In the embodiment, the power source comprises a high voltage interconnecting power supply in which to achieve a maximum interchangeability of components, all voltage sources are constructed on the same principle from solid state components. In addition to the two series-connected DC voltage supply for the stabilizing device, one power supply is used for the DC bias voltage, for the tube, and one power supply as the pulsing DC voltage source for the corona wire, as shown in Fig. 2.
Thus, in use, an electrical force field is applied between the corona wire 8 and the aluminium cylinder 7, the field arising out of the series connection of a DC supply unit with a totally variable output between 0 and 25 kV and a pulse generator 12, the frequency of which is variable between 60 to 6000 Hz. The pulses have a rise to peak time of less than 1 ,u S and a duration of less than 40 CL S. The electrical output from the pulse generator is totally variable in the range 0 to 25 kV. Fig. 2A shows graphically how the pulses 13 are superimposed on the DC current 14, a bias current Fig. 3 shows a circuit for generating the DC voltage applied to the aluminium tube 7. Grid voltage at 220 V loads a condenser map to 300 V DC, through a rectifier 15. An electronic switch 16 changes the DC current into AC current at a frequency of 20 Hz. An applied pulse duration regulator 17 adjusts the voltage level and limits the force of the current in such a way that the device 2 is short circuit steady. A suitable circuit is shown in Fig. 5. The high frequency provides for very small dimensions of transformers which are subsequently connected, the core and copper winding losses also being small compared for example to 50 Hz transformers 6 with the same output capacitance. For maximum transfer of power the resonance frequency of the load capacitance is synchronized at 20kHz with spreading self-conduction of the transformer 6 so that the pulsing voltage has relatively insignificant influence. Outgoing connections are loaded with a condenser 18 of 50 kV which also has a capacitance of 107 pF.
Between the corona wire 8 and the aluminium cylinder 7 a strong electronic field is generated consisting of a bias voltage on which the pulsating DC voltage is superimposed.
Fig. 4 shows a schematic current for generating the pulsing voltage. An adjustable rectifier 19 supplies from the grid a DC voltage of 0-300 V. an electric switch 20 forms pulses with a peak rise time of < 1 p S and a pulse duration of < 40 5. A circuit for the peak voltage generator is shown in Fig.
6. The number of pulses per second is adjusted by a 360O potentiometer to between 60-6000 Hz, using current as shown in Fig. 7.
The high voltage transformer, which is relatively small, has the characteristic that the maximum energy transfer is created when the pulse frequency is in resonance, or harmony, with its own frequency. It will be understood that the use of an AC frequency with a high frequency creates the advantage that transformers 6 of the invention are relatively small in size. Thus the total number of windings decreases substantially, as do the core parameters.
Moreover, the efficiency of the apparatus increase substantially too, as compared with conventional high voltage generators. In order to overcome any limitation of capacity in the secondary windings of the transformer, the volume of the transformers 6 is increased by constructing them of a series of 3 units, each as shown in Fig. 8, in which four coils or secondary windings 22 are mounted in series along a ferrite core 23, there being a single primary winding 24 which is mounted in a PVC duct 25, the whole transformer being within a PVC container 26. The primary winding 24 comprises 120 turns of 0.1 mm diameter copper wire and the four secondary windings 22 each comprise a coil with 5000 turns of 0.11 mm dia copper wire.
Using the above-described transformer 6 of the high voltage power supply and the capacitance formed by the corona wire 8 and aluminium cylinder 7 the current behaves like a resonant circuit, so that a maximum energy transfer is provided, thereby in use leading to effective ionisation of noxious gas molecules which are refined and stabilized as non-noxious molecules in the apparatus 1.
Molecules such as NOX and SO2 are removable from gases in apparatus embodying the invention.

Claims (16)

1. Apparatus for treating a gas to remove gaseous contaminants therefrom, comprising an ionization device and a stabilizing device connected in series and through which gas to be treated flows, wherein the ionization device comprises a corona producing circuit and a pulsed circuit electrically connected to provide substantial electrical resonance in use.
2. Apparatus according to Claim 1, the ionization device comprising a substantially cylindrical body and an internally mounted corona discharge means.
3. Apparatus according to Claim 2, the corona discharge means comprising a wire extending longitudinally of the cylindrical body.
4. Apparatus according to Claim 3, the wire comprising a copper wire extending axially of the body.
5. Apparatus according to Claim 4, the wire and cylindrical body having substantially the same length.
6. Apparatus according to any of Claims 2 to 5, the cylindrical body comprising an aluminium tube.
7. Apparatus according to any preceding claim, the stabilizing device comprising a plurality of spaced apart substantially parallel plates.
8. Apparatus according to Claim 7, there being six plates.
9. Apparatus according to any preceding claim, the electrical circuits comprising a DC supply and a pulse generator the frequency of which is variable between 0 and 6000 Hz.
10. Apparatus according to Claim 9, the frequency being in the range 60 6000 Hz per second.
11. Apparatus according to Claim 9 or Claim 10, the pulse generator being adapted to provide pulses with a pulse rise time of < 1 y S and amplitude of < 40 ju S.
12. Apparatus according to any of Claims 9 to 11, the circuit comprising solid state circuits.
13. Apparatus for treating a gas to remove gaseous contaminants therefrom, substantially as hereinbefore described with reference to the accompanying drawings.
14. A method of treating a gas to remove gaseous contaminants therefrom, comprising providing an ionization device and a stabilizing device in series providing electrical circuits to produce respective electrical charges to each device and providing an electrical charge at the ionizing device which is a corona discharge and a pulse circuit in substantial resonance, and passing the gas through the serially ionization device and stabilization device.
15. A method according to Claim 14, substantially as hereinbefore described with reference to the accompanying drawings.
16. An electrical circuit for producing high voltage impulses with short peak rise times and a pulse frequency variable between 0 and 6000 kH, comprising a high voltage transformer having a plurality of identical units formed in series.
GB9404904A 1994-03-14 1994-03-14 Apparatus and method for treatment of gas by ionization Withdrawn GB2287630A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB9404904A GB2287630A (en) 1994-03-14 1994-03-14 Apparatus and method for treatment of gas by ionization

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB9404904A GB2287630A (en) 1994-03-14 1994-03-14 Apparatus and method for treatment of gas by ionization

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GB9404904D0 GB9404904D0 (en) 1994-04-27
GB2287630A true GB2287630A (en) 1995-09-20

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1997024515A1 (en) * 1995-12-28 1997-07-10 Seondo Electric Co., Ltd. Method and apparatus for cleaning exhaust gas and reducing noise by using high voltage electric field
GB2327841A (en) * 1997-07-23 1999-02-03 Aea Technology Plc Combined power supply and reactor bed in a gas purifier
GB2341094A (en) * 1998-09-07 2000-03-08 Aea Technology Plc Treatment of cabin air
GB2346528A (en) * 1999-01-21 2000-08-09 Aea Technology Plc Power supply for processing of gaseous media
WO2001000301A1 (en) * 1999-06-29 2001-01-04 Pretorius, Johannes Filtering device and method for treating a polluted air stream

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4313739A (en) * 1979-10-01 1982-02-02 Avco Everett Research Laboratory, Inc. Removal of contaminants from gases
WO1987002909A1 (en) * 1985-11-08 1987-05-21 The Florida State University METHOD OF REMOVING SO2, NOx AND PARTICLES FROM GAS MIXTURES USING STREAMER CORONA
US4945721A (en) * 1988-04-14 1990-08-07 Environmental Research International, Inc. Electromagnetic converter for reduction of exhaust emissions
WO1991002581A1 (en) * 1989-08-25 1991-03-07 Advanced Energy Systems (Marketing) Limited Apparatus and method for treatment of gas
US5066316A (en) * 1989-10-06 1991-11-19 Niles Parts Co., Ltd. Exhaust gas purifying apparatus

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4313739A (en) * 1979-10-01 1982-02-02 Avco Everett Research Laboratory, Inc. Removal of contaminants from gases
WO1987002909A1 (en) * 1985-11-08 1987-05-21 The Florida State University METHOD OF REMOVING SO2, NOx AND PARTICLES FROM GAS MIXTURES USING STREAMER CORONA
US4945721A (en) * 1988-04-14 1990-08-07 Environmental Research International, Inc. Electromagnetic converter for reduction of exhaust emissions
WO1991002581A1 (en) * 1989-08-25 1991-03-07 Advanced Energy Systems (Marketing) Limited Apparatus and method for treatment of gas
US5066316A (en) * 1989-10-06 1991-11-19 Niles Parts Co., Ltd. Exhaust gas purifying apparatus

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1997024515A1 (en) * 1995-12-28 1997-07-10 Seondo Electric Co., Ltd. Method and apparatus for cleaning exhaust gas and reducing noise by using high voltage electric field
GB2324053A (en) * 1995-12-28 1998-10-14 Seondo Electric Co Ltd Method and apparatus for cleaning exhaust gas and reducing noise by using high voltage electric field
GB2324053B (en) * 1995-12-28 2000-03-29 Seondo Electric Co Ltd Apparatus for cleaning exhaust gas discharged from an internal or external combustion engine by using a high voltage electric field
US6168689B1 (en) 1995-12-28 2001-01-02 Seondo Electric Co., Ltd. Method and apparatus for cleaning exhaust gas discharged from internal or external combustion engine by using high voltage electric field
GB2327841A (en) * 1997-07-23 1999-02-03 Aea Technology Plc Combined power supply and reactor bed in a gas purifier
GB2327841B (en) * 1997-07-23 2001-03-14 Aea Technology Plc Gas purification
US6548027B1 (en) 1997-07-23 2003-04-15 Accentus Gas purification device
GB2341094A (en) * 1998-09-07 2000-03-08 Aea Technology Plc Treatment of cabin air
GB2341094B (en) * 1998-09-07 2003-01-15 Aea Technology Plc Treatment of cabin air
GB2346528A (en) * 1999-01-21 2000-08-09 Aea Technology Plc Power supply for processing of gaseous media
WO2001000301A1 (en) * 1999-06-29 2001-01-04 Pretorius, Johannes Filtering device and method for treating a polluted air stream

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