Waste-gasification efficiency of a two-stage fluidized-bed gasification system

The results showed that when the operating temperature increased from 700 to 900 °C, the molar percentage of H2 in the syngas produced by the two-stage gasification process increased from 19.4 to 29.7 mol% and that the total gas yield and gas-heating value also increased. When CaO was used as the additive, the molar percentage of CO2 in the syngas decreased, and the molar percentage of H2 increased. When activated carbon was used, the molar percentage of CH4 in the syngas increased, and the total gas yield and gas-heating value increased. Overall, CaO had better effects on the production of H2, whereas activated carbon clearly enhanced the total gas yield and gas-heating value.143