麻栎木材微波干燥中热/质变化行为及能耗特性  

Heat and Mass Transfer Behavior and Energy Consumption Characteristics for Microwave Drying of Quercus acutissima Carruth Wood

作　　者：周泽峰[1,2] 李晓航 潘龙 ZHOU Zefeng;LI Xiaohang;PAN Long(Institute of Ecological Conservation and Restoration,Chinese Academy of Forestry,Beijing 100091,China;Instituted Forest Resource Information Techniques,Chinese Academy of Forestry,Beijing 10093,China;Bluestar(Beijing)Chemical Machinery Co.,Ltd.,Beijing 100176,China)

机构地区：[1]中国林业科学研究院生态保护与修复研究所,北京100091 [2]中国林业科学研究院资源信息研究所,北京100093 [3]蓝星(北京)化工机械有限公司,北京100176

出　　处：《生物质化学工程》2025年第2期39-47,共9页Biomass Chemical Engineering

基　　金：中国林业科学研究院生态保护与修复研究所基本科研业务费(CAFYBB2020SZ009)。

摘　　要：以麻栎木材为原料在自建的微波干燥实验台上考查了其微波干燥过程的热质传递行为以及微波功率和装填量对干燥过程的影响,结合动力学理论分析了麻栎木材微波干燥过程的动力学特征,并探讨了微波干燥过程的能耗变化特性。结果表明:麻栎木材微波干燥过程可分为初期升温干燥段、中期恒温干燥段和后期升温干燥段;中期恒温干燥段为水分脱除的主要阶段。随着微波功率的增加,样品中单位质量水分所吸收的能量随之增加,样品内部水分移动速度和表面水分蒸发速度也随之提高,导致干燥速度加快,干燥所需时间缩短。随着样品装填量的增加,单位质量样品分配的微波密度逐渐降低,导致干燥所需的时间随之延长,干燥速率降低。相比于其他动力学方程,Page动力学模型能更为准确地描述麻栎木材微波干燥过程。装填量25 g时,700 W工况时麻栎木材微波干燥所需的能耗最低;功率500 W时,麻栎木材微波干燥能耗随装填量的增加而减小。Using Quercus acutissima Carruth wood as the raw material,the heat and mass transfer behavior during the microwave drying process and the effects of microwave power and loading amount on the drying process,were investigated on a self-built microwave drying experimental platform.Combined with the kinetic theory,the kinetic characteristics of the microwave drying process of Q.acutissima Carruth wood were analyzed,and the energy consumption variation characteristics during the microwave drying process were explored.The results showed that the microwave drying process of Q.acutissima Carruth wood could be divided into an initial increasing-temperature drying stage,middle constant-temperature drying stage and later increasing-temperature drying stage.The middle constant-temperature drying stage was the main stage for water removal.With the increase of microwave power,the drying speed is increased and the drying time is decreased due to the increasing energy absorbed by unit mass of water in the sample.The moving speed of internal water and the evaporation speed of surface water in the sample also increased,resulting in an accelerated drying rate and a shortened drying time.With the increase of loading capacity,the microwave density allocated to the unit mass of the sample gradually decreased,leading to an increase in the required dring time and a decrease in the drying rate.Compared with other kinetic equations,the Page kinetic model could more accurately describe the microwave drying process of Q.acutissima Carruth wood.When the loading capacity was 25 g,the required energy consumption of microwave drying of Q.acutissima Carruth wood was the lowest under the 700 W working condition.When the power was 500 W,the energy consumption of microwave drying of Q.acutissima Carruth wood decreased with an increase of loading capacity.

关 键 词：麻栎 微波 干燥 传递过程 动力学 能耗 

分 类 号：TQ35[化学工程]