西北林学院学报2018，Vol.33Issue(3)：245-248,296,5.DOI:10.3969/j.issn.1001-7461.2018.03.38
刺猬紫檀材热泵干燥特性及工艺研究
Drying Characteristics and Technology of Pterocarpus erinaceus Based on the Heat pump Drying Process
摘要
Abstract
In order to improve the drying quality of Pterocarpus erinaceus wood,the dehumidification drying and drying characteristics of the wood were analyzed with drying heat pump during the period of drying.Drying curve,moisture content and its deviation,drying stress and dying shrinkage rate were studied.Based on the CT scanning technology,the mathematical model between wood moisture content and CT value was established to study the influence of wood moisture content on drying quality.Based on drying stress,the drying grade was estimated.And drying process was optimized.The results showed that the basic density of the wood was 0.84 g · cm-3,the tangential coefficient of shrinkage was 0.42％,the radial coefficient of shrinkage was 0.32％,the volume coefficient of shrinkage was 0.58％.During the period of drying,the moisture content deviation of thickness was high and the stress gradient was large,indicating that we had to be reduced drying rate.From the linear regression equation of CT value and layer moisture content (y=0.149 8x+18.907 R2 =0.990 3),controllability of stress change and drying quality could be realized during drying.When initial moisture content of the wood was 42.2％,the thickness was 22 mm,optimum drying time was 528 h,the moisture content of is the wood was 10.24％ after drying,from which the drying quality met the requirements of the first grade lumber of Chinese national standard (GB/T6491-1999 sawn timber drying quality regulation level requirements).Technology of drying heat pump could decrease moisture gradient of thickness and drying residual stress effectively during drying.At the same time,technology of drying heat pump could reduce the wood drying shrinkage,deformation,crack defects.关键词
刺猬紫檀材/热泵干燥特性/干燥工艺Key words
Pterocarpus erinaceus/heat pump drying process/drying technology分类
农业科技引用本文复制引用
刘杰,张桂兰,张振涛,山其米克..刺猬紫檀材热泵干燥特性及工艺研究[J].西北林学院学报,2018,33(3):245-248,296,5.基金项目
国家科技部“十二五”科技支撑项目(2015BAD14B04 （）
科技援疆项目(201591116). （201591116）
