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为掌握粉末状与颗粒状木质燃料的动力学特性,选用同一木质成型燃料,通过热重分析仪和管式加热炉系统分别对其粉末状和颗粒状原料进行实验研究。采用双步双等法、等温法等进行动力学拟合推断,求解两者燃烧动力学三因子并进行比较。结果表明:由于燃料内部传热传质性质差异较大,粉末状与颗粒状木质燃料的最概然机理函数并不相同,前者燃烧全过程的燃烧机理基本一致,后者挥发分燃烧阶段与焦炭燃烧阶段的燃烧机理差异较大;粉末与颗粒状活化能值分别为92.33 kJ/mol和71.20 kJ/mol,两者相差21.13 kJ/mol;指前因子值分别为2.55×10~8 s~(-1)和78.55 s~(-1),前者远大于后者,两者相差7个数量级。
In order to understand the kinetic characteristics of powdered and granular woodfuel, the same wood molding fuel was selected and its powdered and granular raw materials were investigated by thermogravimetric analyzer and tube furnace respectively. The two-step double-law, isothermal method and other kinetic fitting deduction, solving the two combustion kinetics three factors and compared. The results show that the most general mechanism of powdery and granular woodfuel is not the same due to the large difference in the heat and mass transfer properties of the fuel. The combustion mechanism of the former is basically the same as that of the combustion of the coke The burning mechanism of the combustion stage is quite different. The activation energy of powder and granule are 92.33 kJ / mol and 71.20 kJ / mol respectively, the difference between them is 21.13 kJ / mol. The pre-exponential factors are 2.55 × 10-8 s ~ -1) and 78.55 s ~ (-1), the former is much larger than the latter, the difference between them is seven orders of magnitude.