B - Operations – Transporting – 03 – C
Patent
B - Operations, Transporting
03
C
183/38, 317/2.1
B03C 3/04 (2006.01) B03C 3/38 (2006.01) B03C 3/40 (2006.01) B03C 3/68 (2006.01)
Patent
CA 1135328
17-21-3208 METHOD AND APPARATUS FOR PARTICLE CHARGING AND COLLECTING ABSTRACT Method and apparatus for charging and collecting submicron particles with high efficiency. A gas stream con- taining particles to be collected flows through charging and collecting apparatus at a rate of, e.g. 10 fps. The particles are charged by a needle-to-plate ionizer having offset rows of needles which are spaced from the plate such that voltage gradients of 6 KV/cm and higher are achieved. Needle-to- needle spacing and effective area of the plate are such that a corona current having a density of at least 4 ma/m2 flows between the needles and the plate. Circuitry is provided that in combination with the ionizer quickly quenches arcs while maintaining the voltage across the ionizer. Charged particles are collected in a collecting section having a deflector electrode and a pair of collecting plates. The deflector electrode includes a conductor embedded in a dielectric material having a dielectric constant greater than 1, which dielectric material suppresses arcs between the deflector electrode and the collecting plates. The collecting plates are irrigated by a liquid flowing uni- formly and continuously from wash headers. Each wash header includes a closed low pressure chamber having a plur- ality of large apertures disposed along the upper reach of its respective plate and a high pressure line disposed inside the low pressure chamber to discharge liquid into the chamber. Baffles are provided to collect efficiently and with low pressure drop those charged submicron particles not collected on the collecting plates.
352095
Natarajan Subbiah
Paranjpe Prabhakar D.
Rao Arshanapalli K.
Mcfadden Fincham
Monsanto Company
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