高温条件下湿石英砂干燥过程试验与分析  

Experiments and analysis on drying process of wet quartz sands in high temperature circumstance

作　　者：张毅[1] 张政清[1] 张永健[1] 高振强[1] 何芳[1] 

机构地区：[1]山东理工大学交通与车辆工程学院热能系,山东淄博255049

出　　处：《可再生能源》2015年第11期1706-1711,共6页Renewable Energy Resources

基　　金：国家自然科学基金资助项目(51076087)

摘　　要：高温条件下物料内部的干燥普遍存在于生物质燃烧、垃圾焚烧等领域，计算时常采用面反应模型。为了明确该干燥过程特点及面反应模型计算的准确性，对3种粒径（40～60，80～100，120-140目）、3种含水率（3％，8％，13％）的石英砂床层分别进行了400℃高温条件下的干燥试验。通过分析物料内部温度变化发现．物料内部被干燥前锋分为干区和湿区两部分，湿区的温度梯度比干区小一个数量级。随物料含水率的升高。干燥前锋温度从约70℃逐渐接近100℃，这与多数面反应模型的简单假设（100℃）不同。物料水分蒸发量采用面反应模型的计算值和实验值在含水率低、粒径小的工况下较为接近。Drying in high temperature circumstance is a normal process in biomass combustion and waste incineration, and the front reaction model is often used to calculate it. In order to deeply understand of the process and to assess the reliability of the calculation model, drying experiments of wet quartz sands at the temperature of 400 ℃ with three moisture contents and three particle sizes have been performed. Results showed that the sand bed can be divided into wet zone and dry zone by the drying front. The temperature gradient in wet zone is an order of magnitude smaller than that of in dry zone. The temperature of the drying front increases from about 70 ℃ to nearly 100 ℃ with the increase of the moisture content, which is different from the temperature assumption （100 ℃ ） in front reaction model. The comparison of water evaporation between calculation and experiments showed that front reaction model is reliable only at conditions of low moisture content and small particle size.

关 键 词：高温 干燥 面反应模型 内部温度 水分蒸发 

分 类 号：TK6[动力工程及工程热物理—生物能] S216[农业科学—农业机械化工程]