Method for reducing emissions of u00e0xido of nitrogu00canio a boiler of recuperau00c7u00e7o, and recuperau00c7u00e7o boiler.Method for reducing nitrogen oxides of a recovery boiler, and a recovery boiler where the furnace (2) of the recovery boiler is supplied with primary air from a primary air nozzles (4), black liquor nozzle of liquor (6a, 6b), secondary air from the mouth. Is secondary air (5) above the primary air nozzles (4) but still below the nozzles of liquor (6a, 6b)The tertiary air from air nozzles (7) above the tertiary nozzle liquor (6a, 6b) of Quaternary air from air nozzles (8) above the Quaternary tertiary air nozzles (7).The black liquor is supplied to the furnace (2) from the first nozzles of liquor (6a) and second nozzles of liquor (6b), the nozzles of liquor (6a)6B) are arranged substantially on the same level in relation to the height of the furnace (2) and the size of droplets of liquor fed from the second nozzles of liquor (6b) is substantially smaller than the size of goticulas liquor supplied from the first nozzle lic Or (6a).
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