METHOD AND APPARATUS FOR BURNING ODOR GAS

A method for burning primary fuel (F1 )， wherein the primary fuel (F1 ) comprises at least a first compound containing nitrogen and a second compound comprising sulfur. The method comprises producing primary combustion gas (G1 ) having a temperature of at least 450 °C and comprising oxygen; feeding the primary fuel (F1 ) and the primary combustion gas (G1 ) to a primary process zone (Z1 ) of a furnace (200); feeding tertiary combustion gas (G3) to a secondary process zone (Z2) of the furnace (200); letting the primary fuel (F1 )， the primary combustion gas (G1 )， and/or their reaction products to move from the primary process zone (Z1 ) via the secondary process zone (Z2) to a tertiary process zone (Z3) of the furnace (200); and feeding quaternary combustion gas (G4) comprising oxygen to the tertiary process zone (Z3) of the furnace (200). An embodiment comprises collecting the primary fuel (F1 ) from a pulp process. A corresponding system. A method for burning primary fuel (F1 )， wherein the primary fuel (F1 ) comprises at least a first compound containing nitrogen and a second compound comprising sulfur. The method comprises producing primary combustion gas (G1 ) having a temperature of at least 450 °C and comprising oxygen; feeding the primary fuel (F1 ) and the primary combustion gas (G1 ) to a primary process zone (Z1 ) of a furnace (200); feeding tertiary combustion gas (G3) to a secondary process zone (Z2) of the furnace (200); letting the primary fuel (F1 )， the primary combustion gas (G1 )， and/or their reaction products to move from the primary process zone (Z1 ) via the secondary process zone (Z2) to a tertiary process zone (Z3) of the furnace (200); and feeding quaternary combustion gas (G4) comprising oxygen to the tertiary process zone (Z3) of the furnace (200). An embodiment comprises collecting the primary fuel (F1 ) from a pulp process. A corresponding system.