To efficiently operate at a low cost a waste melting furnace without decreasing coke combustion efficiency even in the case of fine granular coke along with avoiding blow-through phenomena, by setting up the tuyeres of the furnace in tiers in their height direction and changing the air blast ratios for the respective tuyeres according to coke granular size.
The tuyeres of a waste melting furnace A are set up in tiers in their height direction so as to treat wastes; for example, an air blasting is conducted through a primary tuyere and a second tuyere situated at a coke bed height in the furnace A differing in height from the primary tuyere according as choke granular size or a third tuyere at a height the closest to the choke bed height, thereby the air blast ratios for the respective tuyeres are changed according to coke granular size to operate the furnace A.
SHIRAISHI KATSUHIKO
SHIBAIKE HIDEJI
