Enhanced fabric filtration through controlled electrostatically

Details Enhanced fabric filtration through controlled electrostatically Enhanced fabric filtration through controlled electrostatically

1988-10-11

1990-02-27

Nozick, Bernard

Gas separation

Means within gas stream for conducting concentrate to collector

B03C 300

Patent

active

049042831

ABSTRACT:
A simple electrostatically enhanced fabric filtration system for removing fine particulate matter or dust entrained in a gas flow, has a single, elongate, central, corona-generating electrode positioned within a cylindrical fabric filter, closed at one end, into which the particulate bearing gas flow is directed. In one embodiment, a grid-like cylindrical grounded electrode is disposed proximately outside the filter element and establishes a radially directed electrostatic field with the corona electrode. Particles passing through the corona acquire charges of like polarity and are subjected immediately to Coulombic forces driving them radially outward toward the filter fabric where they collect prominently near the filter element inlet, thus allowing easier passage to the gas further downstream. Other embodiments have a plurality of grounded electrodes attached to the inside of the filter element or as wires woven therethrough. Corona concentration near the filter element entrance by known techniques, e.g., roughening, addition of points to, or by changes in cross-section of the corona electrode, can also be utilized to further enhance all embodiments.

REFERENCES:
patent: 945917 (1910-01-01), Cottrell
patent: 1931436 (1933-10-01), Deutsch
patent: 3483671 (1969-12-01), Wiemer
patent: 3577705 (1971-05-01), Sharlit
patent: 3839185 (1974-10-01), Vicard
patent: 3915676 (1975-10-01), Reed et al.
patent: 3930815 (1976-01-01), Masuda
patent: 4481017 (1984-11-01), Furlong
"Fabric Filtration With Integral Particle Charging and collection in a Combined Electric and Flow Field", Norman Plaks, Dissertation Submitted to the Graduate Faculty of Tokyo University, Jan. 30, 1987.

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