Abstract
There were several cases in which ash chutes were choked up with bottom ash in a few months at a stoker type municipal refuse incineration plant. The formation mechanism of choking product is considered as follows : (1) The formation of weak cement and pozzolan components were promoted owing to intermittent operation of final burning stoker. (2) Weak cement components, etc absorbed water above the water surface of the ash cooling tank owing to an amount of intermittent fall of ash and fiber type hydrates were produced. So ash chutes were consequently choked up with solid products. Making cross section size of ash chutes expanded and water spray onto the inner surface of ash chutes were effective to protect the formation of choking product at ash chutes.
