Patent ID: 6447580
Filing Date: 2002-09-10
Classification: B03C,C04B,Y02W

Abstract:
An electrostatic precipitator for separating a low density fly ash faction from an overall group of fly ash entrained in a gas stream generated from the combustion of coal in a power generation facility and passing through the precipitator comprising:an enlarged hollow body containing a plurality of adjacent areas having a gas inlet duct and gas outlet duct; an expansion nozzle mounted between the inlet duct and a first area of the hollow body, said first area being larger than an area of the gas inlet duct to decelerate the gas stream in said first area so that the low density fly ash contained in the gas stream having a specific gravity of 2.0 or less is separated from the gas stream as the gas stream passes through the nozzle and first area of the hollow body; a first hopper positioned adjacent the first area for collecting only the low density fly ash separated from the gas stream; a plurality of energizable fields positioned within certain of the areas of the hollow body; and a mechanism for energizing certain of the energizable fields when the gas stream is passing through the precipitator except for the first area which is free of energization.