| 褐煤干燥特性的实验研究 |
| |
| 引用本文： | 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 |
| |
| 作者姓名： | 熊程程 向飞 吕清刚 |
| |
| 作者单位： | 1. 中国科学院研究生院,北京100049;中国科学院工程热物理研究所,北京100190
2. 中国科学院工程热物理研究所,北京,100190 |
| |
| 摘 要： | 为获得褐煤颗粒干燥器设计的基础数据,对宁夏褐煤进行了工业分析、热重分析,得到了褐煤水分、挥发分的质量分数,确定了宁夏褐煤干燥的温度范围.褐煤的热重分析表明:褐煤干燥温度应不高于250℃.在热重分析确定的温度范围内,采用薄层干燥方式进行了褐煤颗粒的等温干燥实验,获得了褐煤颗粒干燥速率随水分的变化关系,颗粒的干燥主要处于降...
|
| 关 键 词： | 褐煤 热重分析 有效水分扩散系数 干燥 活化能 |
Experimental study on drying characteristics of lignite |
| |
| XIONG Cheng-cheng,XIANG Fei,L Qing-gang. Experimental study on drying characteristics of lignite[J]. Chemical Engineering, 2011, 39(8): 74-78 |
| |
| Authors: | XIONG Cheng-cheng XIANG Fei L Qing-gang |
| |
| Affiliation: | XIONG Cheng-cheng1,2,XIANG Fei2,Lü Qing-gang2(1.Graduate University,Chinese Academy of Sciences,Beijing 100049,China,2.Institute of Engineering Thermophysics,Beijing 100190,China) |
| |
| 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. |
| |
| Keywords: | lignite thermo-gravimetric analysis effective moisture diffusion coefficient drying activation energy |
| 本文献已被 CNKI 万方数据 等数据库收录！ |
|
