K_xFe_yO_z对煤化学链催化燃烧性能影响研究  

Effect of K_xFe_yO_z on chemical looping catalytic combustion of coal

作　　者：翟春华[1] 郭万军[1] 沈来宏[1] 陈定千[1] 宋涛[1] 肖军[1] 

机构地区：[1]东南大学能源热转换及其过程测控教育部重点实验室,江苏南京210096

出　　处：《燃料化学学报》2014年第3期309-315,共7页Journal of Fuel Chemistry and Technology

基　　金：国家自然科学基金(51276037);江苏省科技支撑项目(BE2012166)

摘　　要：以廉价的钙铝水泥作为载氧体制备过程的载体,并以机械混合-挤压成型造粒法制备了基于Fe2O3为载氧体活性相、钙铝水泥为载体的新型载氧体。在单流化床反应器上研究了钙铝水泥添加比例以及钾添加剂对合成载氧体的化学链燃烧性能的影响。研究结果表明,合成载氧体中载体以Ca2Al2SiO7形式存在,钾的添加显著提高了煤气化反应速率以及煤转化速率,钾在稳定相中以K2Fe22O34存在。K2Fe22O34在煤化学链燃烧过程的催化性能体现在其作为储钾相与KFeO2相的形态转变过程中。The calcium aluminate cement as a cheap material was used to produce a novel cement-supported Fe2O3 oxygen carrier via mechanically mixing and extrusion method. The ratio of cement addition and the effect of K as additive on the CLC performance of coal were experimentally investigated in a single fluidized bed reactor. The results suggest that there is a stable product of Ca2Al2SiO7 formed in the oxygen carders. The coal gasification rate and conversion rate are significantly accelerated by K in the oxygen carrier samples. A stable phase of K2FeE2O34 is found in the oxygen carders. The catalytic effect of K in the coal CLC process depends on the phase transformation of K2Fe22034 and KFeO2.

关 键 词：化学链燃烧 碳捕集 载氧体 催化 

分 类 号：TK546[动力工程及工程热物理—热能工程]