Electric dust collector

In an electric dust collector, including

• (a) a case (9) having a longitudinal dust treatment travel path defined therein, with a dust-containing gas inlet (10) on one side of said travel path, a clean gas outlet (11) on the other side of said travel path, and, a dust collection zone having an input side at one end receiving dust-containing gas from said gas inlet and an output side at the other end to discharge clean gas through said gas outlet;
• the inprovement in said dust collection zone comprising:
• (b) a charging section (45) on said input side having a corona discharge wire means (42) at said one end and, electrode means (41) within said charging section (45) spaced from said corona discharge wire means (42) whereby gas from the gas inlet (10) passing through said corona discharge wire means (42) is electrically charged in said charging section (45);
• (c) a particle collection section in said particle collection zone, intermediate said zone input side and said zone output side, disposed so as to be fed the charged gas which has passed through the charging section (45) said particle collection section having a plurality of particle attracting alternatively positioned parallel positive and negative electrodes, each consisting of a ribbon-like shaped insulating material having side edges, with an electrically conductive layer thereon, spaced from said side edges and of a width considerably narrower than that of the ribbon-like shaped insulating material so as to define insulating sections on both sides of said conductive layer;
• (d) insulative spacing arrangement means positioned and arranged with respect to said insulating sections to provide air passage gaps between said electrodes;
• and,
• (e) flame arrester net means (47) disposed on the output side to prevent the accidental propagation of fire to the outside of the dust collection zone.