| 摘要 |
PROBLEM TO BE SOLVED: To contrive to raise the calorific value of a refined combustible gas by effectively utilizing part of the combustible gas recovered and refined after a top waste gas of a shaft type direct melting furnace is subjected to gas- reforming. SOLUTION: In a waste melting treatment method wherein waste 2, coke 3 and limestone 4 are charged into a shaft type direct melting furnace 10 and oxygen is blown for drying thermal decomposition, combustion and melting, a top waste gas 12 of the shaft type direct melting furnace 10 is separated into a fly ash-containing char 25 and a waste gas 26, and the separated fly ash containing char 25 is gasified and melted in a char gasifying-melting furnace 28 and a char-gasified gas 30 thus produced is reformed together with the waste gas 26 in a gasification reforming furnace 31 so as to recover a crude combustible gas 32, which is then refined, and part 36a of a refined combustible gas 36 thus obtained is blown into the shaft type direct melting furnace 10 so as to raise the calorific value of the refined combustible gas 36.
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