Gas separation – Means within gas stream for conducting concentrate to collector
Patent
1991-06-10
1993-01-19
Chiesa, Richard L.
Gas separation
Means within gas stream for conducting concentrate to collector
55124, 55136, 55151, 31511191, B03C 314
Patent
active
051804042
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to an improvement in corona discharge arrangements for removing and rendering harmless the potentially harmful gaseous products, in particular ozone and nitrogen oxides, that are produced by a corona discharge.
BACKGROUND OF THE INVENTION
A corona discharge arrangement of the kind to which the present invention pertains consists, in principle, of at least one corona electrode and at least one target electrode. The corona and target electrodes are spaced apart, and each of the electrodes is connected to a respective pole of a d.c. source, and the configuration of the corona electrode and the pole voltage of the d.c. source are such as to generate a corona discharge on the corona electrode. This corona discharge results in the generation of electrically charged air-ions of the same polarity as the corona electrode, and the air-ions migrate towards the target electrode, under the influence of the electric field, where they surrender their electric charge.
Corona discharge arrangements of the principle construction are found in many different forms in practice and are used for many different purposes. For example, corona discharge arrangements of this kind are used to a significant extent in air-purifying electrostatic precipitators. In this case, the air ions generated by the corona discharge are operative to charge electrically the contaminants, particles and/or liquid droplets, present in the air in the form of aerosols. These electrically charged impurities are extracted from the air, by being attracted to and bound on collecting surfaces of opposite polarity. Corona discharge arrangements of this kind are also used in air-transportation systems in which air flows are driven with the said of so-called electric ion or corona wind. Various different designs of such air transportation systems are found described in the literature, for instance in international patent applications PCT/SE85/00538, PCT/SE86/00548, PCT/SE87/00595 and PCT/SE88/00365 respectively now U.S. Pat. No. 4,812,711, U.S. Pat. No. 5,006,761, U.S. Pat. No. 5,024,685 and U.S. Ser. No. 07/438,427 now U.S. Pat. No. 5,012,159. Corona discharge arrangements of similar principle construction are also used in various other apparatus, as for instance electrostatic copying machines and laser printers.
A well known and not-readily solved problem encountered with the use of such corona discharge arrangements in spaces or locations in which people are to be found, for instance in dwellings or working places, and also in ventilation systems and air treatment systems which communicate with such spaces or locations, is that the corona discharge will generate chemical compounds, primarily ozone and nitrogen oxides, which are liable to cause an irritating effect and which may even be harmful to people when the compounds are present in excessive quantities. It is also known that a corona discharge will give rise to strong and unpleasant odors, which persist even subsequent to termination of the corona discharge process and subsequent to dispersal of the ozone generated by said process. The nature of these odorous gaseous substances is not known at present, although it is reasonable to assume that they occur as a result of chemical changes in airborne organic compounds in the highly reactive plasma layer of the corona discharge. The odorous substances generated by the discharge may therefore be potentially very harmful.
All of the undesirable, initiating or harmful substances are created in the immediate vicinity of the corona electrode and spread to the ambient air. The substances are produced at a rate which is contingent on the size of the electric corona current, and much higher levels of contaminating substances are produced by a negative corona discharge than by a positive corona discharge. The problem still exists, however, in the case of positive corona discharges. This generation of harmful or irritating substances has seriously limited the possibilities of using corona discharge arrangements in
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Loreth Andrzej
Torok Vilmos
Astra-Vent AB
Chiesa Richard L.
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