Gas separation – Means within gas stream for conducting concentrate to collector
Patent
1988-09-26
1990-09-11
Nozick, Bernard
Gas separation
Means within gas stream for conducting concentrate to collector
55151, 55152, B03C 300
Patent
active
049559915
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to an arrangement for generating an electric corona discharge in air, comprising a corona electrode, a target electrode located at a distance from the corona electrode, and a d.c. voltage source, the two terminals of which are connected to the corona electrode and the target electrode respectively, the voltage between the two terminals of the voltage source and the construction of the corona electrode being such as to generate a corona discharge at the corona electrode.
Corona discharge arrangements of this kind are used to a significant extent in, e.g., electrofilters intended for air purification purposes, in which filters the air ions generated through the corona discharge are utilized to charge electrically the particulate contaminants and/or liquid droplets present in the air. The electrically charged particles/droplets are attracted to and fasten on collecting surfaces which have an opposite polarity to the charged particles or droplets, thus being extracted from the air. The polarity obtained by the particles or droplets is the same polarity as that obtained by the air ions, the polarity of which ions is dependent, in turn, on the polarity of the corona electrode. Electrofilters of this kind are known in many different structural forms. Such corona discharge arrangements may also be used in air transportation systems of the kind which utilize so-called electric ion-winds or corona-winds. Such air transportation systems are found described in, for example, U.S. Pat. No. 4,812,711.
One serious problem encountered with the use of corona discharge generators in localities where people are to be found, such as in domestic dwellings or places of work for instance, and also in ventilation systems or air processing systems which are connected to such localities, is that the corona discharge generates chemical compounds, primarily ozone and nitrogen oxides, which if present in excessively high concentrations can be experienced as irritative, and may also be harmful to the health. The generation of these irritants in conjunction with a corona discharge occurs at a rate which is contingent on the magnitude of the electric corona current, and is much greater in the case of a negative corona discharge than in the case of a positive corona discharge. Consequently, a positive corona discharge has been used practically always when employing such systems and apparatus in human environments However, the aforesaid irritants are still generated even when employing a positive corona discharge, and the problem thus still remains Consequently, it is necessary to limit the corona current in relation to the quantity of air that passes the corona discharge arrangement per unit of time, so that the proportion of irritants present in this quantity of air is restricted to acceptable values. In particular the corona current must be limited quite radically when the arrangement used is one in which the same air passes by the corona discharge arrangement a number of times and therewith results in a successive accumulation of irritants in the air. In the case of electrofilters this necessary radical limitation of the corona current results in a filter of low efficiency and also in filters of large dimensions, while in the case of air transportation systems which operate with ion winds, it is extremely difficult to transport air in quantities which are sufficiently large from a practical point of view The use of pointed or needle-like corona electrodes has been practically excluded by the necessity of working with a positive discharge, despite the fact that such electrodes are beneficial both from an electrotechnical and a mechanical aspect. This is because when using needle-like or pointed corona electrodes and creating a positive corona discharge, so-called streamers, i.e. long thread-like corona discharge channels, readily form in the ambient air, these streamers resulting in an unstable corona discharge and in an increase in the generation of irritants.
Consequently, the object of the present inventi
REFERENCES:
patent: 2004352 (1935-06-01), Simon
patent: 3184901 (1965-05-01), Main
patent: 4339782 (1982-07-01), Yu et al.
patent: 4435190 (1984-03-01), Taillet et al.
Loreth Andrezej
Torok Vilmos
Astra-Vent AB
Nozick Bernard
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