COREX用煤高温成焦质量分析及预测模型

Analysis on Coking Quality of Coal for COREX and Prediction Model

针对宝钢COREX-C3000所使用的两种块煤展开研究,检测分析了煤A和煤B焙烧过程中成焦的粉化率、冷态强度和热态性能、光学组织结构以及微观形貌.结果表明,随着焙烧时间的增加,煤焦A的粉化率不断下降,由32%下降到11%,而煤焦B的粉化率不断上升,由12%上升到22%;煤焦A和B的冷态强度及热态性能在6 h左右发生突变,成焦在6 h左右完成;煤焦A中镶嵌结构均高于4%,远高于煤焦B,在COREX内代替焦炭的骨架作用优于煤焦B,而煤焦B中类丝碳结构均在25%以上,使得其在COREX炉内代替焦炭热源及还原剂作用明显;煤焦光学组织结构与热态性能之间的关系可通过多元线性回归得到,从而建立可靠的煤焦质量预测模型.

The two coals used in COREX-C3000 process were studied. Pulverization, cold strength, hot performance, optical textures and microstructure of coal chars A and B produced by roasting were measured and analyzed. The results showed that the pulverization rate of coal char A declined from 32% to 11% while that of B rose from 12% to 22% with the increase of roasting time. The cold strength of coal chars A and B changed suddenly in about 6 h, indicating that the coking process was finished in 6 h. The mosaic texture content of coal char A was higher than that of B with over 4%, so its function as skeleton in COREX instead of coke would be better than coal char B. The fusain content of coal char B was much higher than that of A with over 25%, which high lighted its function as heat source and reductant. The relationship between optical texture and hot performance of coal char could be obtained by multiple linear regression for establishment of a reliable prediction model of coal char quality.