酒精污泥干燥特性及数学模型

用红外干燥方法对酒精污泥进行干燥实验,研究了干燥温度和污泥厚度对水分蒸发速率、干燥速率及体积变化率的影响。实验表明,恒速干燥段的干燥速率仅与干燥温度有关;临界湿含量随污泥厚度增加而升高,随干燥温度的升高而下降;污泥体积在恒速干燥段收缩速度较快,在降速干燥段仍有微小的变化。对污泥干燥特性曲线进行分析,建立了恒速干燥段及降速干燥段的干燥模型,并将模型预测与实验结果进行了对比,误差较小。

Drying characteristic and mathematic modeling of alcohol sludge

In this study, the infrared drying method was used to dry the alcohol sludge. The effects of drying temperature and the thickness of sludge on evaporation rate, drying rate and volume change rate were investigated. The results demonstrated that drying speed in the constant drying rate stage is only concerned with the drying temperature; critical moisture content increases with the increase of the sludge thickness, but decreases with the increase of the drying temperature; the volume shrinkage rate of sludge in constant rate drying period is high, and there is still minor changes in falling rate drying period. In addition, based on the analysis of the sludge drying characteristics curve, the mathematical model of the sludge drying in constant rate drying and falling rate was successfully established. Comparing the calculated outcome from the established model with the experiment results, there is little difference between them.