Chemical-Looping Combustion of Biomass in a 10 kWth Reactor with Iron Oxide As an Oxygen Carrier

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• 作者：Laihong Shen ; Jiahua Wu ; Jun Xiao ; Qilei Song ; Rui Xiao
• 刊名：Energy & Fuels
• 出版年：2009
• 出版时间：May 21, 2009
• 年：2009
• 卷：23
• 期：5
• 页码：2498-2505
• 全文大小：303K
• 年卷期：v.23,no.5(May 21, 2009)
• ISSN：1520-5029

文摘

Chemical-looping combustion of biomass was carried out in a 10 kW_th reactor with iron oxide as an oxygen carrier. A total 30 h of test was achieved with the same batch of iron oxide oxygen carrier. The effect of the fuel reactor temperature on gas composition of the fuel reactor and the air reactor, the proportion of biomass carbon reacting in the fuel reactor, and the conversion of biomass carbon to CO₂ in the fuel reactor was experimentally investigated. The results showed that the CO production from biomass gasification with CO₂ was more temperature dependent than the CO oxidation with iron oxide in the fuel reactor, and an increase in the fuel reactor temperature produced a higher increase for the CO production from biomass gasification than for the oxidation of CO by iron oxide. Although the conversion of biomass carbon to CO₂ in the fuel reactor decreased with the increase of the fuel reactor temperature, there was a substantial increase in the proportion of biomass carbon reacting in the fuel reactor. X-ray diffraction (XRD) and scanning electron microscopy (SEM) were utilized to characterize fresh and reacted oxygen carrier particles. The results showed that the transformation of Fe₂O₃ to Fe₃O₄ is the favored step in the process of iron oxide reduction with biomass syngas. The low reactivity of reacted oxygen carrier was mainly ascribed to the sintering grains on the particle surface. To restrain the surface sintering of oxygen carrier particles, an intensive oxidization of reduced oxygen carrier with air in the air reactor should be avoided in the process of oxygen carrier regeneration, and air staging should be adopted for the oxidization of reduced oxygen carrier with air in the air reactor.