马尾松木材微波干燥特性的研究  

Microwave drying properties of Pinus massoniana lumber

作　　者：刘志军[1] 李延军[2] 张璧光[3] 刘智[1] 

机构地区：[1]河北农业大学木材科学与工程系,河北保定071000 [2]浙江林学院工程学院,浙江临安311300 [3]北京林业大学材料科学与技术学院,北京100083

出　　处：《浙江林学院学报》2006年第5期482-485,共4页Journal of Zhejiang Forestry College

基　　金：国家自然科学基金资助项目(598760005)

摘　　要：研究了马尾松Pinus massoniana木材微波干燥速度、温度梯度和含水率梯度随时间的变化规律。实验结果表明,微波连续干燥过程明显分为加速段、等速段和减速段3个阶段,等速段在整个干燥过程中占的比例最大。微波干燥过程中,温度的变化大致分为初期升温,等温和后期升温3个阶段,初期升温和等温阶段木材内温度分布比较均匀,后期升温阶段木材内的温差逐渐增大。微波干燥过程中,在整个横断面上,木材初含水率梯度没有被加大,而是被均匀化,甚至还出现木材表面含水率提高的情况。The variational regularity of drying microwave drying was studied. The objective is rate, temperature and moisture distribution with time during wood to provide the theoretic accordance for microwave drying technology. The results show that the continuous microwave drying process can be divided into three stages： accelerating （speed-up） stage, constant-speed stage and speed-down stage. The constant-speed stage occupied the largest proportion. In the microwave drying process, temperature change process can be divided into coming-up stage, isothermal stage, and late coming-up stage. The temperature inside of the lumber was even both in coming-up stage and isothermal stage, and in the latter coming-up stage, the wood temperature was increased, and so as the temperature difference. The original moisture content gradient was not raised but was averaged in the whole cross section, and the surface moisture content was increased.

关 键 词：林业工程 马尾松 微波干燥 干燥特性 含水率梯度 

分 类 号：S782.31[农业科学—木材科学与技术]