挤出滚圆法规模制备复合矿石氧载体及长周期反应性能研究

Large-scale Preparation of Composite Cu-Fe Ore Oxygen Carrier by Extrusion-Spheronization and Its long-Periodic Performance Investigation

本文以铜、铁矿石为活性组分,蒙脱石为惰性载体,采用挤出滚圆法批量制备了FeCu-xM(x=10,20,30,40)系列氧载体。首先在热重分析仪上对不同的氧载体进行长周期H_(2)/O_(2)化学链燃烧性能测试,发现FeCu-10M具有最佳的物化性能。随后在批次流化床上对FeCu-10M氧载体进行了煤的化学链燃烧长周期性能评估测试,结果显示该氧载体整个循环过程中均展示出稳定优异的氧化还原性能。XRD和SEM结果显示反应前后氧载体的晶相、表面和内部微观形貌并未发生明显的烧结与团聚。本文研究结果表明采用挤出滚圆法批量制备的铜、铁矿石复合氧载体具有良好的长周期循环反应性能、经济性与工业大规模应用前景。

Large-scale prepared composite oxygen carriers(OCs) by extrusion-spheronization method,using copper ore and iron ore as active components, montmorillonite as inert carrier, are studied in this work. Long-term TGA tests are first conducted to screen out the optimum montmorillonite loading ratio by H_(2)/O_(2)redox testing. The results indicate that FeCu-10M has the optimal reaction performance and mechanical stability. Subsequently, a hundred cycles of tests are further performed over the FeCu-10M oxygen carrier coal based chemical looping combustion test is performed in a batch fluidized bed, using coal as fuel. Results show that the FeCu-10M OC presents stable and excellent redox reaction properties. XRD patterns and SEM images demonstrate that there is no significant sintering or agglomeration occurs in the particles or the inner surface of the particles after reaction. The results attained in this work indicate that iron-copper ore composite oxygen carriers prepared by extrusion-spheronization method have the advantages of stable cyclic reactivity,economy and promising for large-scale industrial application.