本文采用激光衍射法和光学显微计算机图像系统及自行开发的软件,测量了三个典型煤在快速加热初期燃烧、等温加热燃烧和火焰燃烧方式的颗粒尺寸,运用分数维理论,建立了煤燃烧颗粒破碎理论,实验和理论研究揭示了煤燃烧中颗粒尺寸变化的本质,理论计算和实验结果符合良好。 In this paper, the particle size of three typical coal in the rapid heating initial combustion, isothermal heating combustion and flame combustion were measured by laser diffraction and optical microscopic computer image system and the software developed by ourselves. Using the fractal dimension theory, the coal combustion Particle crushing theory, experimental and theoretical studies reveal the nature of particle size changes in coal combustion, the theoretical calculations and experimental results in good agreement.