燃料化学学报2012，Vol.40Issue(10)：1179-1187,9.
基于碱金属和过渡金属修饰铁矿石载氧体的煤催化燃烧
Catalytic combustion of coal using alkali and transition metals loaded on iron ore oxygen carrier
摘要
Abstract
The coal gasification rate is the limiting step during the chemical looping combustion (CLC) process. The effects of Na- and Ni-based additives loaded on the iron ore oxygen carriers on the chemical looping combustion (CLC) of coal were investigated in a fluidized bed. The influences of temperature, loading and cycle number on the performance of compound oxygen carriers were evaluated. The catalytic effect of Na is found to be higher than that of Ni at 920℃. The rate of reaction is enhanced with increasing the loading of Na and Ni. The peaks of all the exit gas concentration appear earlier and in the later stage the decay rate of that becomes larger. The concentration of CO in the exit gas is obviously decreased, whereas that of CO2 and H2 is increased. With a 6% loading of Ni, the catalytic effect of Ni on the carbon conversion is remarkable at 960 t, in which the carbon conversion is up to 92. 7% that is about 15. 5% higher than that using the iron ore. However, the effect of Ni on the carbon conversion is not obvious at 800 ~ 920℃. Compared with Ni, Na shows an obvious catalysis on the coal combustion of CLC in the whole experimental temperature region (800 ~ 960℃). The scanning electron microscope (SEM) and the energy-dispersive X-ray (EDX) analysis show that there is a severe loss of Na on the surface of used Na-based iron ore, but a less loss of Ni on the surface of used Ni-based iron ore.关键词
化学链燃烧/催化气化/铁矿石/钠/镍Key words
chemical-looping combustion/ catalytic gasification/ iron ore/ natrium/ nickel分类
化学化工引用本文复制引用
张思文,沈来宏,肖军,顾海明,宋涛..基于碱金属和过渡金属修饰铁矿石载氧体的煤催化燃烧[J].燃料化学学报,2012,40(10):1179-1187,9.基金项目
国家自然科学基金(50976023). （50976023）
