低阶煤热破碎研究现状及建议

Status and suggestion of thermal fragmentation of low rank coal

为解决低阶煤的大规模清洁利用问题,分析了国内外煤颗粒受热发生破碎的研究现状,重点介绍了煤燃烧破碎的机理、煤质特性及热转化条件对破碎的影响。针对低阶煤分级转化制备油气产品中粉尘含量高的技术难题,提出了抑制低阶煤热破碎的方法及途径。应以煤的自身物理化学性质(内因)为出发点研究煤热转化过程中的破碎机理,兼顾外部热转化条件(外因),结合热反应产物,建立破碎过程与受热过程的关系,同时对反应器的结构进行优化创新,最小化颗粒的运动抑制粉尘产生,实现低阶煤的清洁高效利用。

In order to cleanly use lignite in large-scale, the status of fragmentation during thermal conversion of coal at home and abroad was analyzed. The fragmentation mechanism, the effects of coal quality and transformation conditions on fragmentation of coal were investigated. Due to the issue such as high content of dust in tar during the utilization of low rank coal, some solutions for inhibit pathway of thermal fragmentation were proposed. The fragmentation mechanism could be revealed by analyzing and regulating the physical and chemical properties of low rank coal and the transformation conditions. Based on the thermal reaction products,the relationship between fragmentation and heating process was established. The amount of dust could be decreased through exploiting new reaetor which minimized the motion of coal partieles. A technology approach for clean and efficient utilization of low rank coal was built.