title: Waste-gasification efficiency of a two-stage fluidized-bed gasification system.
abstract: This study employed a two-stage fluidized-bed gasifier as a gasification reactor and two additives (CaO and activated carbon) as the Stage-II bed material to investigate the effects of the operating temperature (700°C, 800°C, and 900°C) on the syngas composition, total gas yield, and gas-heating value during simulated waste gasification. 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 29.7mol% 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.
authors.affiliation: Department of Safety, Health and Environmental Engineering, Ming Chi University of Technology, New Taipei City, Taiwan.
authors.forename: Zhen-Shu
authors.initials: ZS
authors.lastname: Liu
authors.affiliation: Department of Civil and Environmental Engineering, National University of Kaohsiung, Kaohsiung 811, Taiwan. Electronic address: cllin0407@nuk.edu.tw.
authors.forename: Chiou-Liang
authors.initials: CL
authors.lastname: Lin
authors.affiliation: Department of Civil and Environmental Engineering, National University of Kaohsiung, Kaohsiung 811, Taiwan.
authors.forename: Tsung-Jen
authors.initials: TJ
authors.lastname: Chang
authors.affiliation: Department of Civil and Environmental Engineering, National University of Kaohsiung, Kaohsiung 811, Taiwan.
authors.forename: Wang-Chang
authors.initials: WC
authors.lastname: Weng
mesh_terms: D056804:Biofuels; D017610:Calcium Compounds; D002245:Carbon Dioxide / Q000032:analysis; D004867:Equipment Design; D006859:Hydrogen / Q000032:analysis; D010087:Oxides; D012037:Refuse Disposal / Q000295:instrumentation* / Q000379:methods*; D013696:Temperature
chemical_list: D056804:Biofuels; D017610:Calcium Compounds; D010087:Oxides; D002245:Carbon Dioxide; D006859:Hydrogen; C016538:lime
keywords: Activated carbon; Biomass; CaO; Fluidized bed; Gasification; Syngas