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OALib Journal期刊
ISSN: 2333-9721
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基于钾基修饰铁矿石载氧体的煤化学链燃烧循环实验
, PP. 927-934
Keywords: 钾,铁矿石,煤,化学链燃烧
Abstract:
？对天然的铁矿石加以钾基修饰,在流化床上进行了煤化学链燃烧循环实验。研究了改性后的铁矿石对气体产物浓度及含碳气体体积分数影响的持续力。钾基铁矿石缩短了反应时间并明显提高了co2浓度;在20次循环中,钾基铁矿石能明显提高co2体积分数并降低co体积分数,11次循环后,co2体积分数稍有减少,co体积分数略有增加。借助于扫描电镜与电子能谱(sem-edx)和x射线衍射(xrd),对不同循环后的载氧体进行表征。与纯铁矿石相比,前10次循环钾基铁矿石载氧体表面严重烧结,20次循环之后烧结减轻,恢复多孔结构。结果表明,钾基铁矿石载氧体中kfe11o17或其衍生物对煤气化有催化作用;在20次循环中存在钾流失现象;20次循环后钾基铁矿石载氧体能完全氧化为fe2o3。
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