摘要
利用偏差活化能方法研究物料工业干燥动态特性和探索干燥机理的有效途径。通过实验和理论分析,研究了被干燥物料的偏差活化能随其几何尺寸变化的规律,以及相同几何尺寸时偏差活化能随干燥环境温度变化的关系。研究表明,物料在干燥过程中,不同几何尺寸的试样其偏差活化能均呈现波动趋势,环境温度从低温到高温变化过程中出现偏差活化能最低的环境温度最佳区域,并非干燥环境温度越高,干燥率越高;在温度较低的干燥环境下,物料从泥状到小几何尺寸时,偏差活化能变化不大;偏差活化能随着被干燥物料几何尺寸的减小而降低,相对偏差活化能随着干燥温度的升高而较快地接近1。
It is a useful approach for the industrial drying to investigate the dynamical characteristics of materials to be dried by the way of the warp apparent activation energy of materials （WAAEM）.Based on investigating theoretically and experimentally, the relationship,in the paper,between the size of materials and the drying environmental temperature and WAAEM has been studied.It is discovered from the research that （1） there are a few of fluctuating on the dynamic drying curves during drying,and the optimized values of WAAEM corresponding to environmental drying temperature appear in these curves rather than the higher the drying temperature, the stronger the water evaporate.（2） WAAEM varies lightly in the process of drying when the size of test samples is in the status of mashed or small dimensional shape. （3） WAAEM will decease while the size of materials minish,and the relative warp apparent activation energy will approach the value of 1 rapidly while drying temperature rising, and vice versa.
基金
本项目由北京自然科学基金项目资助(编号:3043017)
关键词
干燥
动态特性
偏差活化能
物料尺寸
环境温度
Drying
Dynamic characteristic
warp apparent activation energy
size
temperature
