NOx Emission Characteristics of Industrial Burners and Control Methods under Oxygen Enriched Combustion Conditions.

摘要

Flame characteristics and emissions of NO(sub x) were measured for four different industrial burners in two test furnaces for firing rates between 0.5 and 10 (times) 10(sup 6) Btu and furnace temperature between 2000 and 2700(degree)F. Both natural gas and No. 6 fuel oil were used. Oxygen concentration of enriched air was varied from 21 to 100%. NO(sub x) emissions with natural gas increased sharply from 0.1 to over 1.85 lb/10(sup 6) Btu at a constant furnace temperature was raised from 2000 to 2700(degree)F the NO(sub x) emissions at 35% O(sub 2) rose about 24%. NO(sub x) emissions diminished with increasing oxygen concentration above 50% O(sub 2) for two oxy-fuel burners due to the rate controlling effect of nitrogen concentration. NO(sub x) emissions of 0.36 to 0.48 lb/10(sup 6) BTU were observed for a high flame temperature oxy-fuel burner at 90 to 100% Btu O(sub 2) and 2000-2700(degree)F furnace temperatures. NO(sub x) concentration as low as 0.01 lb/10(sup 6) Btu was measured for a low flame temperature oxy-fuel burner at 100% O(sub 2) and 2000(degree)F furnace temperature. No(sub x) emissions with No. 6 fuel oil containing 0.54% nitrogen were measured for an air burner and an oxy-fuel burner at 2000(degree)F. Relatively small effect on NO(sub x) emission was observed for the air burner. 12 refs., 11 figs. , 1 tab.