Patent ID: 7226570
Filing Date: 2007-06-05
Classification: B01D,F23J,F23N

Abstract:
1. A process for treating fly ash found in flue gas resulting from the burning of coal to prevent rapping reentrainment of fly ash particles said process taking place in a system comprising plates of an electrostatic precipitator, an ESP inlet and an ammonia conditioning control system said process comprising adding ammonia to flue gas containing the fly ash particles and sulfur trioxide and with said ammonia being added in a stoichometric amount of one part or somewhat less of ammonia to one part of sulfur trioxide, such that rapping reentrainment of fly ash particles in the flue gas is prevented and wherein an optimum amount of ammonia to be added is determined by an algorithm which provides step 1) a value for SO step 2) multiplying the SO step 3) outputting the calculated value to the ammonia conditioning control system to add ammonia to the system which ammonia along with sulfur trioxide in the said flue gas produce ammonium bisulfate which increases the cohesivity of fly ash on the plates of said electrostatic precipitator.