【摘要】 本文通过溶胶凝胶法制备了Ca₂Fe₂O₅氧载体用于生物质化学链气化制备富氢合成气研究。结果表明，相比于生物质常规的热解和水蒸气气化，采用Ca₂Fe₂O₅作为氧载体进行化学链气化时水蒸气和氧载体的协同作用大大提高了H₂产率和碳转化率；不同氧载体实验和热力学分析结果对比凸显了Ca₂Fe₂O₅氧载体优异的反应特性；通过对反应工况进行优化得出最佳反应条件为气化温度850?C、水蒸气浓度30%和氧燃比0.2，该工况下H₂产率和总气体产率为0.91 m³/kg和1.83 m³/kg,H₂/CO比接近3；最后，10次循环实验以及氧载体表征结果表明Ca₂Fe₂O₅氧载体的循环稳定性良好，在10次循环过程保持相对稳定的气体产率，且氧载体晶相和微观形貌并无较大改变。更多还原

【Abstract】 In this paper,Ca₂Fe₂O₅ oxygen carrier was prepared by sol-gel method for the production of hydrogen-rich syngas from chemical looping gasification of biomass.The results show that compared with the conventional pyrolysis and steam gasification of biomass,the synergistic effect of steam and oxygen carrier greatly improves the H₂ yield and carbon conversion rate when Ca₂Fe₂O₅is used as oxygen carrier.The comparison of different oxygen carrier and thermodynamic analysis highlights the excellent reaction characteristics of Ca₂Fe₂O₅ oxygen carrier.By optimizing the reaction conditions,the optimum reaction conditions were obtained as follows:gasification temperature850℃,steam concentration 30 % and oxygen-fuel ratio 0.2.Under this condition,the H₂ yield and total gas yield were 0.91 m³/kg and 1.83 m³/kg,respectively,and the H₂/CO ratio was close to 3.Finally,10 cycles of experiments and oxygen carrier characterization results show that the Ca₂Fe₂O₅oxygen carrier has good cycle stability,where the crystal phase and microstructure of the oxygen carrier have almost no change.更多还原