To reduce volume of waste and permit effective utilization of waste heat, by a method wherein the waste is decomposed in a pyrolysis furnace into pyrolysis gas and pyrolysis char while the pyrolysis char is gasified by oxygen or oxygen- enriched air, then, the pyrolysis gas and the gasified pyrolysis char are treated through cooling, dust collection and desalting to burn the same and produce superheated steam.
When waste is burnt in a pyrolysis furnace 1, organic substance in the waste is decomposed into pyrolysis gas and pyrolysis char of fine powder. The pyrolysis gas is separated from the pyrolysis char in a cyclone 2 while the pyrolysis gas is burnt in a pyrolysis gas combustion furnace 3 and is cooled by a pyrolysis gas heat recovery boiler 4, then, dust in the same gas is collected by a pyrolysis gas dust collector 5 and the gas is discharged. On the other hand, the pyrolysis char is gasified in a melting furnace 6 by blowing oxygen or oxygen-enriched gas and, next, is cooled in a melting furnace gas cooling furnace 7, then, dust in the same gas is removed by a melting furnace gas dust collector 8 and hydrochloric acid gas in the same gas is removed by a melting furnace gas washing device 9 while clean fuel gas, obtained in such a manner, is incinerated in a melting furnace gas combustion boiler 10 to recover heat.
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NISHIMURA HIDEO
KAWAMURA TAKAFUMI
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