Various size of pulverized coal and char were prepared for experiments, also their physical and chemical characters were experimentally analyzed.
制备了不同细度的实验煤粉和煤焦，并对其物理化学特性进行了实验研究。
The primary oxygen concentration obviously affected NO reduction, especially when the reburning coal and char had bigger size.
初始氧浓度对煤粉和煤焦再燃还原NO效率均有明显影响，当粒度较粗时这种影响更加显著。
There may be existed an optimal coal-char size range that makes abundant porosity and bigger pore specific areas to enhance the gasification reaction.
实验中发现在一定的气化工况下，煤焦存在一个合适的颗粒尺寸范围，能形成比较大的孔比表面积和孔容积，有利于增强煤焦的气化反应。
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