【摘要】 生物质能源的开发与利用有助于缓解日益严重的能源危机与环境污染。在生物质能源的利用中,生物质化学链气化技术展现了较好的发展前景。以来源广泛、经济友好的赤铁矿为载体,在小型流化床反应器中进行了生物质化学链气化制备合成气实验研究,研究了O/C、水蒸气流速、反应温度对合成气产率的影响,同时进行生物质焦油分析和循环实验。结果表明:在O/C为0.2,水蒸气流量为0.15 mL/min,反应器温度为850℃时,6 g松木屑CO、CH₄、H₂产量分别为2.43,0.77,1.4 L。XRD结果表明:在水蒸气存在的条件下,赤铁矿的还原受到抑制,Fe₂O₃只能被转化为Fe₃O₄;多次循环后,赤铁矿比表面积由2.63 m²/g变为1.35 m²/g;SEM分析多次循环的赤铁矿发现,氧载体颗粒表面烧结现象明显。更多还原

【Abstract】 The development and utilization of biomass energy contributes to easing the increasingly serious energy crisis and environmental pollution, and in utilization of biomass energy, biomass chemical looping gasification technology shows a bright development prospect. In this study, the experiment of syngas prepared by chemical looping gasification of biomass was conducted in a small fluidized-bed rector using friendly hematite of extensive sources as the carrier. The influence of O/C ratio, steam flow rate and reaction temperature on syngas yield were investigated, and biomass tar analysis and cyclic tests were also performed. The results indicated that good effect with the yields of CO, CH₄ and H₂ being 2.43 L, 0.77 L and 1.4 L respectively was achieved when O/C ratio was 0.2, steam flow rate was 0.15 mL/min and reaction temperature was 850 ℃. The XRD result showed that: the reduction of hematite was inhibited when vapor exists so that Fe₂O₃ could only be reduced into Fe₃O₄; after repeated cycles, hematite’s specific surface area was decreased from 2.63 m²/g to 1.35 m²/g; SEM analysis on the multi-cycled hematite found that the surface sintering of oxygen carrier particulate matters was obvious.更多还原