To reduce the NOx content of the exhaust gas from a refuse gasifying and melting facility by elaborating a plan to improve the two-stage combustion method, used in the secondary combustion chamber of the facility.
A low-NOx combustion equipment is incorporated in a refuse gasifying and melting facility provided with a gasifying furnace 6, which performs partial oxidization and combustion on the refuse supplied from a dryer 3 that dries the refuse at a low air ratio, a melting furnace 10 which burns and melts unburned components and solid contents (char) generated in the furnace 6, the secondary combustion chamber 14 in which the unburned components from the furnace 10 are completely burned, and an exhaust gas treating facility which treats the exhaust gas from the chamber 14. The combustion equipment supplies a waste combustion gas 30, subjected to flue-gas treatment to the secondary combustion chamber 14 on the downstream side of the melting furnace 10 as a gas for complete combustion, by keeping the inside of the furnace 10 in a reduction atmosphere (lower than the theoretical air ratio). Also the exhaust gas from the dryer 3 is used as the gas for complete combustion of the combustion chamber 14, instead of the waste combustion gas.
KOBAYASHI KAZUKI
MORI HIDEJI
