化学工程2011，Vol.39Issue(8)：74-78,5.
褐煤干燥特性的实验研究
Experimental study on drying characteristics of lignite
熊程程 1向飞 2吕清刚2
作者信息
- 1. 中国科学院研究生院,北京100049
- 2. 中国科学院工程热物理研究所,北京100190
- 折叠
摘要
Abstract
In order to design a lignite dryer, the proximate and thermo-gravimetric analysis of Ningxia lignite were carried out and the constant-temperature drying characteristics were studied. The relative mass fraction of water and volatilization in lignite was obtained from thermo-gravimetric analysis, showing that the temperature for drying operation should be lower than 250℃. According to the constant-temperature drying experiments, there is not constant-rate drying period for lignite and the drying rate is mainly controlled by water diffusion. The effective moisture diffusion coefficient is varied from 5.912 ×10 -8 to 1.815 ×10 -7 m2/s at 80-120℃. Based on Arrhenius type equation, the relationship between the effective diffusion coefficient and temperature was established, finding that the activation energy for moisture diffusion of lignite drying is 32.44 kJ/mol.关键词
褐煤/热重分析/有效水分扩散系数/干燥/活化能Key words
lignite/ thermo-gravimetric analysis/ effective moisture diffusion coefficient/ drying/ activation energy分类
化学化工引用本文复制引用
熊程程,向飞,吕清刚..褐煤干燥特性的实验研究[J].化学工程,2011,39(8):74-78,5.
