To improve the efficiency at the time of gasifying solid combustibles with a gasifying fluidized bed by making stable burning treatment or melting treatment possible by limiting the unbent ash supplied to an unburnt ash combustion or melting furnace to one kind and making the particle size or component of the unburnt ash uniform.
In a method in which solid combustibles are burned or melted by gasifying the combustibles by supplying them to a gasifying fluidized bed incinerator 10 and introducing an unburnt gas containing unburnt ash to a solid-gas separator 20 from a freeboard 18, and then, burning or melting the solid-gas separated unburnt ash in an unburnt ash combustion furnace or melting furnace 24 the undurnt ash accumulated in the fluidized bed 16 of a gasifying fluidized bed incinerator 10 is extracted together with a fluidized medium and pulverized with a pulverizing machine 30. The pulverized ash is returned to the fluidized bed 16 and introduced to the solid-gas separator 20 for solid-gas separation together with an unburnt gas from the freeboard 18. Thus all unburnt ash is unitarily treated as scattered dust.
FUJIYAMA HIROSHI
YOSHII YASUHIKO
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