摘要
以我国3种典型煤种(褐煤、烟煤和无烟煤)制备的煤灰和铁基载氧体为对象,在热重分析仪上研究了煤灰与铁基载氧体之间的相互作用,考察了煤灰对铁基载氧体反应性能、持续循环性能和物理结构的影响。结果表明,3种煤灰均能够提高还原阶段气体燃料的转化效率使得铁基载氧体的失重量显著增加,其中无烟煤煤灰对气体燃料转化率的提高最为显著,铁基载氧体失重量比未添加煤灰时提高了37%,褐煤灰和烟煤灰表现相似,铁基载氧体失重量提高约35%。未添加煤灰的铁基载氧体循环反应性能表现稳定,而添加3种煤灰后的铁基载氧体持续循环能力呈现不同程度的下降,主要原因是3种煤灰在铁基载氧体颗粒表面的沉积导致铁基载氧体颗粒发生不同程度的烧结,其中无烟煤对铁基载氧体物理结构的影响最小。
The coal ashes derived from three typical Chinese coals( lignite,bitumen,and anthracite) were prepared and used to investigate the interaction between coal ash and iron-based oxygen carrier in a thermogravmetric analyzer,and the effect of coal ash on the reactivity,recyclability and physical structure of iron-based oxygen carrier was evaluated. The results showed that all three coal ashes could enhance the fuel gas conversion in the reduction period,in which anthracite ash behaved the best with the highest fuel conversion achieved. Compared to the stable cyclic performance of iron-based oxygen carrier without coal ash presented,the recyclability of iron-based oxygen carrier showed different degrees of degradation after three coal ashes were added. The reason could be ascribed to the sintering on the surface of oxygen carrier particles,which was mainly caused by the ash deposition on the iron-based oxygen carrier. Of all the prepared coal ashes,anthracite ash was showed to have the minimal impact on the physical structure of iron-based oxygen carrier.
出处
《热能动力工程》
CAS
CSCD
北大核心
2016年第12期81-86,共6页
Journal of Engineering for Thermal Energy and Power
基金
国家杰出青年科学基金资助项目(51525601)
国家自然科学基金资助项目(51476035)
关键词
化学链燃烧
中国煤种
煤灰
铁基载氧体
相互作用
chemical-looping combustion
Chinese coal
coal ash
ironbased oxygen carrier
interaction
