Electrostatic air treatment and movement system

Details Electrostatic air treatment and movement system Electrostatic air treatment and movement system

1989-06-19

1991-06-18

Nozick, Bernard

Gas separation

Means within gas stream for conducting concentrate to collector

55131, 55135, 55151, 361230, B03C 300

Patent

active

050246852

DESCRIPTION:

BRIEF SUMMARY
The present invention relates to an air transport system and preferably also to further treatment of the transported air, such as cleansing air from aerosol and/or gaseous impurities and/or heating or cooling the air, while using a so-called electric ion wind or corona wind as the actual air transporting medium.
It is known to transport air with the aid of a so-called electric ion-wind or corona-wind. A system constructed to this end will, in principle, comprise a corona electrode and a target electrode which are mutually spaced apart and each connected to a respective terminal or pole of a d.c. voltage source, wherein the configuration of the corona electrode, the mutual potential difference, and the distance between the corona electrode and the target electrode are such as to engender at the corona electrode a corona discharge which generates air ions. The air ions thus generated migrate rapidly to the target electrode under the influence of the electric field extending between the corona electrode and the target electrode, where they surrender their electrode charge. During their movement along this path, the ions collide with electrically neutral air molecules and transfer electrostatic forces thereto, such as to draw these air molecules towards the target electrode and therewith transporting air in the form of a so-called ion wind or corona wind. Air transporting systems of this kind are described and illustrated in International Patent Application PCT/SE 85/00538.
As will be seen from this international patent application, it is possible to achieve significant air flow velocities and air flow throughputs with the aid of such ion or corona winds. High efficiencies, however, are contingent on a large potential differences between corona electrode and target electrode, in order to be able to sustain a corona discharge when the corona electrode and the target electrode are spaced at a considerable distance apart. A large corona current, which per se promotes high air flow velocities and a high air throughput, has the drawback or resulting in an increase in the generation of chemical compounds, primarily ozone and oxides of nitrogen, in the vicinity of the corona electrode, which are recognized as serious irritants and even a health hazard for human beings. Consequently it is desirable to apply a moderate corona current and to space the corona electrode and the target widely apart. It will also be seen from the international patent application that it is necessary to screen carefully the corona electrode of these known systems, in order to prevent the air ions produced from wandering or migrating in directions other than towards the target electrode. Although it is desireable to achieve a high volumetric throughput, when a system of this kind is used not only for transporting air, i.e. purely as a fan, but also for treating the air being transported, i.e. to cleanse the air of contaminants carried thereby and/or to change the temperature of the air, there is not the same need to achieve high flow velocities of the air passing through the system. Low air flow velocities are actually preferred in this dual purpose use of such systems, since low velocities result in longer dwell times of the air in the vicinity of the air treatment devices incorporated in the system, and therewith in greater efficiency, without it being necessary to give said devices an exaggerated axial extension in the direction of the air flow. system constructions in which the target and corona electrodes are enclosed in an air flow duct in which the air treatment devices are located together with or downstream of the target electrode, which is the most natural and most obvious construction, have been found to have significant drawbacks. For example, it has been found very difficult to achieve uniform velocity distribution across the whole cross-section of the flow duct; non-uniform velocity distribution will detract from the efficiency of the air treatment devices. It is also difficult to prevent the air treatment devices from presentin

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