Patent ID: 6168425
Filing Date: 2001-01-02
Classification: C10G,C10J,C10K,F23G,Y02P

Abstract:
A method for treating solid wastes by pyrolysis gasification in a fluidized-bed gasification furnace, and then high-temperature combustion in a melting furnace, characterized in that: a primary combustion in a fluidized-bed of said gasification furnace is carried out at a temperature of 600.+-.50.degree. C., a secondary combustion in a freeboard of said gasification furnace is carried out at a temperature of 725.+-.75.degree. C. by blowing air into a portion immediately above said fluidized-bed, and a tertiary combustion in said melting furnace is carried out at a temperature higher than a fusion temperature of ashes by 50 to 100.degree. C.; an oxygen ratio (a ratio of an amount of oxygen supplied for combustion to a theoretical amount of oxygen for combustion) in said primary combustion is in the range of 0.1 to 0.3, an oxygen ratio in said secondary combustion is in the range of 0.05 to 0.1, an oxygen ratio in said tertiary combustion is in the range of 0.9 to 1.1, and a total oxygen ratio is about 1.3.