大颗粒煤流化床燃烧的微观过程

Micro-structure evolution of coarse particles in fluidized bed combustion process

采用电镜扫描和图像处理技术、物理吸附等手段研究了大颗粒煤在流化床燃烧过程中的微观结构变化.结果发现:所研究的烟煤在流化床燃烧过程中,小于400像素的微观孔隙随燃烧过程大量增加,而大于400像素的孔隙数量则没有变化;同时伴随着煤颗粒的比表面积随燃烧时间的增加而明显增加.

Microstructure evolution of coarse particles in fluidized bed combustion （FBC） was investigated by SEM technology, diagram processing technology and physical absorption method. It was found that the quantity of micro-pores increased when their sizes were less than 400 pixels in diagram for bituminous coal, but never changed when their sizes were larger than 400 pixels. The specific surface area of coarse particles obviously increased with increasing combustion time during fluidized bed combustion.