中文摘要：

煤颗粒的热膨胀破碎特性直接影响流化床锅炉的运行效率。利用热机械分析仪（TMA）测定了不同种类不同密度的型煤受热膨胀的特性，并对部分破碎微观形貌利用场发射扫描电子显微镜（FSEM）进行了观察；通过马弗炉内的燃烧试验研究了热膨胀特性和燃烧破碎的关系。研究表明，煤颗粒在燃烧过程中其热膨胀破碎主要发生在挥发分析出阶段；内部挥发分的析出会使颗粒内压增大而产生膨胀，进而产生细小裂纹并破碎；挥发分越高，颗粒密度越大，其热膨胀形变率越大，越容易发生破碎现象；主要挥发分析出后热膨胀引起的破碎可以忽略。

英文摘要：

The thermal expansion and fragmentation property of coal particle influences the efficiency of CFB boiler directly. The thermal expansion property of shaped coals of different kinds and density were measured by thermal mechanical analyzer （TMA）. At the same time, the micro-configuration of fragmentation was observed by FSEM. The relationship between the thermal expansion property and burning fragmentation was studied by burning experimentation in the muffle furnace. The research shows that the thermal expansion and fragmentation of coal particles mainly occur in the stage of devolatilization during the coal combustion. The interior devolatilization of coal particle can increase the interior pressure which can produce expansion and fine crack leading to fragment. With increased volatility and density of coal, the extent of thermal expansion will be larger, and fragmentation will be more likely to take place. The fragmentation which induces thermal expansion can be neglected after the main devolatilization.