原煤可磨性对气流床粉煤气化混配煤煤粉均匀程度的影响

以气流床粉煤气化工业装置不同时期的两组进料煤粉为研究对象,在实验室按粒径对两组煤粉进行了筛分分组,对分组后子煤粉进行了煤质、煤灰特性及反应活性分析,研究了原煤可磨性差异对混配磨制后煤粉均匀程度的影响。结果表明,原煤可磨性对混煤煤粉的颗粒粒径分布及其均匀性均具有影响。混配磨制煤粉的粒径主要取决于原煤中可磨性指数较小的原煤,此原煤可磨性指数越小,煤粉颗粒粒径越大;可磨性相近的原煤混配制得的煤粉混合较均匀,可磨性差异较大的原煤混配煤粉混合不均,煤粉发生偏析,使得大颗粒煤粉中含有过多的难磨煤,导致煤粉的反应性能变差。     

Correlations of Bond and Breakage Parameters of Some Ores with the Corresponding Point Load Index

This paper presents significant correlations of the Bond parameter (work index, W_i and grindability, G) and the breakage parameters (specific rate of breakage, S_i and the fineness value, γ) with the point load index (I_s(50)). The experimental results obtained from calcite, barite, colemanite and bauxite samples have demonstrated that the Bond and breakage parameters were closely correlated with the point load index. That is, the values of G, S_i and a_T parameters decreased with the increase in the values of the point load index; however, the γ parameter of B_i,j increased with increasing I_s(50) values.