High H2/CO Ratio Syngas Production from Chemical Looping Gasification of Sawdust in a Dual Fluidized Bed Gasifier

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• 作者：Jimin Zeng ; Rui Xiao ; Dewang Zeng ; Yang Zhao ; Huiyan Zhang ; Dekui Shen
• 刊名：Energy & Fuels
• 出版年：2016
• 出版时间：March 17, 2016
• 年：2016
• 卷：30
• 期：3
• 页码：1764-1770
• 全文大小：470K
• ISSN：1520-5029

文摘

Chemical looping gasification (CLG) in a dual fluidized bed gasifier was proposed to increase the H₂/CO ratio and to simplify the process in gasification. The gasifier offered two separate fluidized bed reactors, fuel reactor (FR) and steam reactor (SR), for biomass gasification and H₂ production. Iron ore was used as the oxygen carrier (OC), providing lattice oxygen for gasification in the FR, transferring to the SR for reacting with steam to produce H₂, and then achieving the circulation and reoxidation through the loop seal. The product gas from the FR and the SR could be controlled to make high H₂/CO ratio syngas by this process. The experiment for the CLG of sawdust was conducted in a dual fluidized bed gasifier, regarding the influence of different FR temperatures, SR temperatures, steam/biomass (S/B) ratios, and steam preheating temperatures. The optimum operating condition was obtained by the analysis showed as follows: the FR temperature of 820 °C, the SR temperature of 910 °C, the S/B ratio of 1.50 kg kg^–1, and the steam preheating temperature of 500 °C. At this condition, the cold gas efficiency in the FR was 77.21% and the H₂ yield in the SR was 0.279 Nm³ kg^–1. Overall, the CLG process of sawdust carried out in the present work suggests that a high H₂/CO ratio syngas production was simple and promising.