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Desulfurization and denitrification system
Desulfurization and denitrification system
The diluted liquid ammonia (mass concentration20%~25%) or urea solution (mass concentration 30%~50%) is injected via the atomized spraying system into the proper temperature area of the decomposing furnace (850~1050℃) , and atomized ammonia and NOx (mixture of NO, NO2 , etc.) perform selective non-catalytic reduction reaction to convert NOx into the pollution-free N2. When the temperature in the reaction area is over-low, the reaction efficiency will be decreased; when the temperature in the reaction area is over-high, the ammonia will be oxidized into N2 and NO. After spraying ammonia, the chemical reactions inside the furnace include:
4NO+4NH3+O2→4N2+6H2O
6NO+4NH3→5N2+6H2O
6NO2+8NH3→7N2+12H2O
2NO2+4NH3 +O2→ 3N2+6H2O