摘要
在不同颗粒直径和不同的干燥介质温度下,对褐煤进行干燥动力学实验研究。得到了褐煤的干燥曲线和干燥速率曲线,采用薄层干燥模型对实验数据进行模拟,得到了褐煤的干燥方程和干燥速率方程。提出了褐煤干燥速率常数的经验公式k=A exp[(-E_v(1+C_dlnd))/(RT)],其中指前因子A=5.819min^(-1),界面蒸发活化能E_v=21347.5KJ/mol,经验常数C_d=0.0409m^(-1),干燥时间指数n=1.516。
experiments were performed to study the drying kinetics of lignite, and the drying curves, as well as the drying rate curves were obtained under different drying medium temperatures and different lignite particles diameters, respectively. The experimental data of drying kinetics of lignite satisfied well with Page（ I ） model on that the drying equation and the drying rate equation were derived. Empirical equation of the drying rate constant k was proposed, which is given as k=A exp[-Ev（1＋Cd1nd）/Rt] in that thepre-exponential factor A=5.819min^-l, the activation enery of interface evaporation Ev=21347.5KJ/mol, the experimental constant Ca=0.0409m^-1 and the drying time index n= 1.516.
关键词
褐煤
薄层干燥
干燥动力学
干燥速率常数
lignite
thin-layer drying
drying kinetics
drying rate constant
