Electrostatic dust precipitators

Claim 2

An electrostatic dust precipitator comprising: a discharge electrode structure comprising: a plurality of rod-shaped parallel electrodes of circular cross-section; and a plurality of pins provided on a predetermined number of less than all of said rod-shaped electrodes and extending in a direction of the flow of a dust containing gas in said electrostatic dust precipitator wherein the rod shaped electrode with pins is upstream of the rod shaped electrode without pins; a dust collection electrode structure, said dust collection electrode structure comprising a plurality of spaced apart rod-shaped parallel electrodes of circular cross-section; means for supporting said discharge electrode structure and said dust collection electrode structure in spaced parallel opposing relationship; and means for supplying DC voltages of opposite polarities upon said discharge electrode structure and said dust collection electrode structure whereby the dust containing gas initially flows between a rod shaped discharge electrode with pins and a rod shaped collecting electrode.

Claim 3

The electrostatic dust precipitator according to claim 1 wherein said discharge electrode structure comprises the plurality of rod shaped parallel electrodes of circular cross-section.

Claim 4

The electrostatic dust precipitator according to claim 2 wherein a predetermined number of said rod shaped electrodes are provided with a plurality of pins having pointed opposite ends and extending in the direction of the flow of dust containing gas, said rod shaped electrodes and rod shaped electrodes provided with pins being spaced by a predetermined number of rod shaped electrodes.

Claim 5

The electrostatic dust precipitator according to claim 1 wherein said dust collection electrode structure comprises a plurality of parallel rod shaped electrodes.

Claim 6

An electrostatic dust precipitator according to claim 1 wherein said discharge electrode structure and said dust collection electrode structure are parallel to the flow of the dust containing gas through said electrostatic dust precipitator.

Claim 7

An electrostatic dust precipitator according to claim 5 wherein the predetermined number of rod-shaped electrodes provided with a plurality of pins comprises one rod-shaped electrode with pins for every five rod-shaped electrodes without pins.

Claim 8

A multi-stage electrostatic dust precipitator comprising: a discharge electrode structure aligned in a direction of the flow of a dust containing gas and comprising a plurality of blocks each of which includes a single rod-shaped electrode, disposed at the entrance of the block, with a plurality of pins extending in said direction of the dust containing gas flow and a predetermined number of spaced apart rod-shaped parallel electrodes without the pins disposed between the single rod-shaped electrode with the pins of one block and that of an adjacent block to prevent interactions between pins provided for the one block and those for an adjacent block, said rod-shaped electrode without the pins having a large longitudinal surface area to promote the attraction thereto of positively charged dust particles; a dust collection electrode structure comprising a plurality of spaced apart rod-shaped parallel electrodes of substantially the same configuration as that of said electrode without the pins; means for supporting said discharge electrode structure and said dust collection electrode structure in spaced parallel opposing relationship, wherein a distance between the pin and one rod-shaped electrode opposing thereto of the dust collection electrode structure is different from a distance between the rod-shaped electrode of the dust collection electrode structure and the opposing rod-shaped electrode without the pins of the discharge electrode structure; means for supplying DC voltages of opposite polarities upon said discharge electrode structure and said dust collection electrode structure; and means, including said single electrode with the pins, said one rod-shaped electrode opposing thereto of the dust collection electrode structure and one rod-shaped electrode without the pins adjacent to said single electrode within the same block, for forming, when applied with the DC voltages of opposite polarities, a steeply localized and highly intensive ionization region between said pin and said one rod-shaped electrode of the dust collection electrode structure.

Claim 9

A multi-stage electrostatic dust precipitator comprising: a discharge electrode structure aligned in a direction of the flow of a dust containing gas and comprising a plurality of blocks each of which includes a single rod-shaped electrode, disposed at the entrance of the block, with a plurality of pins extending in said direction of the dust containing gas flow and a predetermined number of spaced apart rod-shaped parallel electrodes without the pins disposed between the single rod-shaped electrode with the pins of one block and that of an adjacent block to prevent interactions between pins provided for the one block and those for an adjacent block, said rod-shaped electrode without the pins having a large longitudinal surface area to promote the attraction thereto of positively charged dust particles; a dust collection electrode structure comprising a plurality of spaced apart rod-shaped parallel electrodes of substantially the same configuration as that of said electrode without the pins; means for supporting said discharge electrode structure and said dust collection electrode structure in spaced parallel opposing relationship, wherein a distance between the pin and one rod-shaped electrode opposing thereto of the dust collection electrode structure is different from a distance between the rod-shaped electrode of the dust collection electrode structure and the opposing rod-shaped electrode without the pins of the discharge electrode structure; means for supplying DC voltages of opposite polarities upon said discharge electrode structure and said dust collection electrode structure; and means, including said single electrode with the pins, said one rod-shaped electrode opposing thereto of the dust collection electrode structure and one rod-shaped electrode without the pins adjacent to said single electrode within the same block, for forming, when applied with the DC voltages of opposite polarities, a steeply localized and highly intensive ionization region between said pin and said one rod-shaped electrode of the dust collection electrode structure.