| 摘要 |
PROBLEM TO BE SOLVED: To solve problems that, a conventional method has a low rate of gas conversion at low temperatures and generation of a large amount of tar components and is inefficient in gasifying biomass and there are many cases that catalysts are expensive, when the catalyst is used in the gasification. SOLUTION: The cost of catalyst is lowered by using natural white clay, natural zeolite, bentonite and the like which are inexpensive as a catalyst and easily available in Japan. The raw biomass material for gasification is mixed with a chip-like crushed material having ca. 30×30×3 mm size and a catalyst and fed to a gasification reaction unit. The gasification reaction unit comprises a rotary kiln on a shaft passing through a heating furnace or a screw conveyor and feeds a nongasified unreacted residue discharged from the gasification reaction unit as a main fuel to the heating furnace. The gasification reaction unit proceeds the gasification reaction of the biomass at 500-750°C by feeding the raw biomass material, the catalyst and steam with insulating from outside air. The catalyst is reheated in the heating furnace and used by recycling, therefore, discharge of waste outside the system is reduced as far as possible. COPYRIGHT: (C)2004,JPO
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