Patent ID: 6109911
Filing Date: 2000-08-29
Classification: D21C,F23C,F23G,F23J,Y02E

Abstract:
A method for reducing emissions of nitrogen oxides upon burning of odor gases of a pulp mill in a combustion apparatus provided with a tubular furnace, which has first and second opposite ends and a tubular wall between said first and said second opposite ends and which defines a longitudinal direction and transverse directions, said method comprisingsupplying odor gases, as fuel, and combustion air to the combustion apparatus from said first end of the furnace,and discharging the resulting flue gases from said second end of the furnace,wherein said combustion air is supplied sub-stoichoimetrically to the furnace of the combustion apparatus simultaneously with the odor gases to reduce the formation of nitrogen oxides,and wherein additional air is supplied at one or more points to a middle region of the furnace of the combustion apparatus from the middle of the furnace towards the walls through a separate duct which extends into the furnace from said second end wherein the total amount of said additional air and said combustion air corresponds at least to stoichiometric combustion.