Combustion apparatus provided with spray nozzle

Provided is a combustion apparatus provided with spray nozzles which can spread atomized particles of reductant over a wide range within a furnace, so that combustion gas passing through the inside of the furnace is uniformly mixed with the reductant, to promote a reaction between the reductant and the combustion gas, and to reduce the amount of nitrogen oxide emitted from the combustion apparatus. In the combustion apparatus provided with the spray nozzles, a reductant supply system (14) for supplying a furnace (1) with a reductant fluid that contributes to the reduction of nitrogen oxide contained in combustion gas is disposed; spray nozzles (13) for spraying the reductant supplied from the reductant supply system (14) as atomized particles toward combustion gas passing through the inside of the furnace, are provided in the wall surface of the furnace downstream of burners (2); and a plurality of spray ports (30, 31) for forming flat fan-like spray shapes having different angles of spread of the atomized particles of reductant sprayed into the furnace, are provided in the tip portions of the spray nozzles (13).