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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 lump coals used by COREX-C3000 in Baosteel were studied, and the pulverization rate, cold strength and thermal properties, optical microstructure and microstructure of coke formed during the firing of coal A and B were detected and analyzed. The results showed that with the increase of roasting time, the pulverization rate of coal char A decreased continuously from 32% to 11%, while the pulverized coal char B increased continuously from 12% to 22% The cold strength and thermal properties of B changed suddenly at about 6 h, and the formation of coke was completed in about 6 h. The inlay structure of coal A was higher than 4%, far higher than that of coal char B, and replaced the skeleton of coke within COREX The effect is better than that of coal char B, while that of coal char B is more than 25%, which makes it have an obvious effect to replace coke heat source and reductant in COREX furnace. The relationship between optical structure and thermal behavior of coal char It can be obtained by multiple linear regression to establish a reliable coal quality prediction model.