Filter for particulate materials in gaseous fluids

Gas separation: apparatus – Electric field separation apparatus – Electric charge produced by friction

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Details

96 57, 96 63, 96 67, 96 99, B03C 330

Patent

active

053686357

ABSTRACT:
A non-ionizing, clog-resistant filter for extracting fine particulate contaminants such as smoke from a gaseous fluid stream such as air uses interaction between Van der Waals forces and a non-ionizing electrostatic field to efficiently capture the contaminant particles in a filter material whose pores are many times larger than the diameter of the particles to be captured. The filter material is physically so configured to further enhance that interaction, and is disposed between at least a pair of electrodes of opposite polarity. The material may be spaced from the electrodes, but preferably touches one of them. The particles are trapped deeply into the thickness of the filter material and leave ample room for continued air flow. The electrostatic voltage is preferably between 3 and 9 kV and is largely independent or electrode spacing. The configuration of the filter material is such that the flow velocity through the material is less than 0.1 m/sec, preferably on the order of 0.03 m/sec.

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Kanagawa Industrial Tech Development, Japanese Newspaper, Oct., 1989.
Nikkei Mechanical Japanese Publication, p. 81, Oct. 1989.

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