Abstract: An electric dust precipitator comprising a chamber, a pair of dust collecting electrode groups, disposed in parallel with each other in the gas-flow direction in the chamber, the electrode groups being spaced apart by a distance of more than 400 mm, each electrode being made of a tubular member through which a cooling fluid for controlling the temperature thereof is passed and a plurality of discharging wires disposed in parallel with and between the dust collecting electrode groups wherein a high direct current voltage is applied between the discharging wires and the dust collecting electrodes, and a control system including a detecting means which detects the number and quantity of spark discharges caused by reverse ionization per unit time and a control means which controls the temperature of the cooling fluid with aid of a detected signal.

Abstract: An electric dust precipitator comprising a chamber; a pair of groups of dust collecting electrodes disposed in the chamber; a plurality of discharging wires disposed between the dust-collecting electrode groups, a high d.c. voltage being applied to the wires and electrodes; and two horizontal scraping means each of which includes two sliding bars, adapted to slide along opposite surfaces of the electrodes and having brackets at the inside thereof, and drawing plates, wherein ends of the drawing plates in pairs are pivotally mounted on the brackets and the other ends of the drawing plates in pairs are commonly suspended by chains, respectively, whereby the dust precipitated on the electrodes can be easily and completely removed by winding up the chains and hence moving up the scraping means.