Through the different pyrolysis time tests in 200 kg coke oven of lump coal mainly used in melter gasifier, namely A coal and B coal, the size distribution and strength change of the two coals after coking are compared. Results show that the pulverization of B coal in coke oven was severe, whose size degradation rate (DR) always increases with the coking time prolonging. On the contrary, the DR of A coal decreases once reaching the maximum value. The mineral microstructures of semi coke formed by the two coal pyrolysis in coke oven are also compared. It is found that semi coke formed by A coal is mainly mosaic and isotropy structure, and the other semi coke formed by B coal is mainly fusain and isotropy structure. There is still some coal residue in both semi cokes. Through the mineral microstructure analysis of different particle size of carbon-containing materials in tuyere samples taken out from melter gasifier, it is discovered that the particles less than 6.3 mm in hearth are caused by the semi coke pulverization which is mainly from B coal.%采用200 kg级炼焦炉对熔融气化炉主要使用的2种块煤进行了不同时间的半焦裂解试验，比较了2种块煤成焦后的粒度分布和强度变化，发现B煤在炼焦炉内粉化严重，随结焦时间的延长其粒度降解度一直在升高，而A煤降解度在达到最大值后开始下降.对比了2种块煤生成半焦的矿相微观结构，A煤生成的半焦主要以镶嵌结构和各向同性结构为主，而B煤生成的半焦主要以类丝炭和各向同性结构为主；2种半焦均含有未成焦煤.通过分析熔融气化炉内取出的风口试样中不同粒度的含碳物质其矿相微观结构，认为在炉缸内<6.3 mm的颗粒由2种块煤裂解成焦后的粉化现象所引起，且B煤的粉化是主要因素.
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