摘要
为解决木材空气能辅助太阳能干燥设备增湿过程中缺少蒸汽来源的问题,通过“闷窑干燥”工艺(关闭干燥设备内进排气通道,依靠木材中蒸发的水分来增加介质湿度),以期实现其干燥过程的湿度调节、保证杨木干燥品质。采用分层切片及图像解析等方法分析空气能辅助太阳能供热“常规干燥”(Conventional Drying,CD)工艺和空气能辅助太阳能供热“闷窑干燥”(Stuffy Kiln Drying,SKD)工艺杨木锯材的干燥速率、分层含水率、弹性应变的变化趋势以及干燥质量。结果表明,空气能辅助太阳能干燥过程中供热SKD工艺可提高一定阶段的干燥介质湿度。在含水率10%~120%,SKD干燥速率是CD的81.25%,干燥时长较CD的104 h仅延长22 h,同时木材厚度上的含水率偏差降低了12.05%,提高了材堆整体干燥均匀度和木材的干燥质量。
In order to solve the problem of lack of steam source in the humidification process of wood air energy assisted solar drying equipment,this study adopted the process of‘stuffy kiln drying'(closing the inlet and exhaust channels in the drying equipment,and relying on the evaporated moisture in the wood to increase the humidity of the medium).In order to realize the humidity adjustment in the drying process and ensure the drying quality of poplar.The drying rate,stratified moisture content,elastic strain variation trend and drying quality of poplar sawn wood in the process of‘conventional drying'(CD)with air energy assisted solar heating and‘stuffy kiln drying’(SKD)with air energy assisted solar heating were analyzed by using the method of stratified slice and image analysis.The results showed that the SKD process can improve the humidity of the drying medium in a certain stage during the air energy assisted solar heating drying process.In the range of moisture content from 10%to 120%,the drying rate of SKD was 81.25%of CD,and the drying time was only 22 h longer than 104 h of CD.At the same time,the deviation of moisture content in wood thickness was reduced by 12.05%,which improved the overall drying uniformity of the wood pile degree and dry quality of the wood.
作者
汤赛
迟祥
宋晓雪
朱志鹏
蔡英春
程万里
TANG Sai;CHI Xiang;SONG Xiaoxue;ZHU Zhipeng;CAI Yingchun;CHENG Wanli(Engineering Research Center of Advanced Wooden Materials,Ministry of Education,Northeast Forestry University,Harbin 150040,China;University of British Columbia,Forestry College,Vancouver BCV6T1Z4,Canada)
出处
《森林工程》
北大核心
2023年第3期107-115,149,共10页
Forest Engineering
基金
国家自然科学基金项目(31870544)
黑龙江省自然科学基金项目(LH2022060)。
关键词
空气能辅助太阳能干燥
闷窑工艺
杨木锯材
干燥效能
Air energy assisted solar drying
stuffy kiln process
poplar sawn wood
drying efficiency
