METHOD FOR FUSION TREATING A SOLID WASTE FOR GASIFICATION

摘要

The present invention relates to a method for treating solid wastes such as refuse-derived fuel or biomass wastes by pyrolysis gasification in a fluidized-bed gasification furnace 1, and then high-temperature combustion in a melting furnace 9. A primary combustion in a fluidized-bed 4 of the gasification furnace is carried out at a temperature of 600 +/- 50 DEG C, a secondary combustion in a freeboard 3 of the gasification furnace is carried out at a temperature of 725 +/- 75 DEG C, and a tertiary combustion in the melting furnace 9 is carried out at a temperature higher than a fusion temperature of ashes by 50 to 100 DEG C. An oxygen ratio (a ratio of an amount of oxygen supplied for combustion to a theoretical amount of oxygen for combustion) in the primary combustion is in the range of 0.1 to 0.3, an oxygen ratio in the secondary combustion is in the range of 0.05 to 0.1, an oxygen ratio in the tertiary combustion is in the range of 0.9 to 1.1, and a total oxygen ratio is about 1.3.