JPS5570356A - Electric dust collector with an excitation control type facial plasma source - Google Patents

Abstract

PURPOSE: To obtain high dust collecting performance by repeatedly making the operation in which exciting voltage is supplied to an excitation control type facial plasma source to generate plasma and the negative charge of dust particles on dust collecting plate is neutralized during the zero voltage period of high-tension ripple main voltage.

CONSTITUTION: A negative high-tension ripple main voltage is applied across the discharge plate group 28 and the dust collecting plates 33 and 33' to supply negative ions to the dust collecting plates 33 and 33', whereby floating dust particles in gas coming into the spaces 40 and 40' from the gas inlet 24 are deposited and adhered to the dust collecting plates 33 and 33'. Then, during the time when the main voltage is zero, an exciting voltage occurs from the exciting power source 6 and a facial plasma appears on the dust collecting plates 33 and 33'. The positive ions in the plasma 9 are attracted by stored negative charge on the dust layer on the strip elec trode groups 2, 2', 2"..., thus resulting in the complete neutralization of negative charge. The repeated neutralization of the negative charge enables dust to be collected while suppressing the generation of reverse electrolytic dissociation even if the electric resistance of dust to be collected is high.

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