DUST COLLECTING METHOD AT SLAG TAPPING OPENING OF REFUSE MELTING FURNACE

PROBLEM TO BE SOLVED: To improve a working environment in front of a slag tapping opening, by a method wherein a spouting gas which includes a large amount of dust and smoke and is generated at a slag tapping opening at the time of slag tapping operation in a refuse melting furnace is sucked by a combustion air blower by way of a dust collecting hood disposed above a front portion of the slag tapping operating and is fed to a combustion furnace as a produced gas combustion air. SOLUTION: In a refuse melting furnace 14, a dust collector 40 which is disposed above a front portion of a slag tapping opening 30 is made of an inversely conical dust collecting hood 41 having a suction opening and an air supply duct 42. In a slag tapping operation, a first flow direction control valve 43 is closed and a second flow direction switching valve 44 is opened and thereafter a combustion air blower 19 is operated so as to suck a blow-off gas containing dust and smoke which is produced at the slag tapping opening 30 along with air. Then, the mixture of blow-off gas and air is supplied to the inside of a combustion furnace 17 by way of an air supply duct 42, a combustion air supply pipe 20, the combustion air blower 19 and a combustion air supply pipe 18. Since the combustion air blower 19 has a large capacity, it can completely such the blow-off gas generated at the slag tapping opening 30 and can supply it into the combustion furnace 17 as combustion air for a generated gas.