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Position: Home > Articles > Research on the Drying Properties of Wood under Vacuum-Floating Pressure Scientia Silvae Sinicae 2004,40 (4) 139-144

木材真空-浮压干燥特性的试验研究

作  者：
伊松林;张璧光;常建民
单  位：
北京林业大学木材干燥中心
关键词：
木材干燥;真空;浮压;预热;干燥特性
摘  要：
以马尾松为试验材料 ,首先分别以过热蒸汽和空气作为干燥介质 ,在预热阶段通过对木材内部温度场和含水率变化的测定 ,探讨了木材真空 -浮压干燥预热阶段的特性 ;然后 ,通过对干燥介质条件与干燥速率之间影响关系的研究 ,总结出木材真空 -浮压干燥的特性。结果表明 :真空 -浮压干燥预热阶段进行得非常迅速 ,同时其表面水分的凝结量也较空气干燥大 ;木材的浮压干燥速率随着干燥介质温度的增加、绝对压力的减小和浮动频率的加大而增加。上述因素中对干燥速率影响程度从大到小的排列顺序为 :介质温度 (T) >压力浮动频率 (Hz) >绝对压力 (P)
译  名：
Research on the Drying Properties of Wood under Vacuum-Floating Pressure
作  者：
Yi Songlin Zhang Biguang Chang Jianmin(Drying Center of Beijing Forestry Universtry Beijing100083)
关键词：
Wood drying, Vacuum, Floating pressure, Preheating, Drying characteristics
摘  要：
Using the Masson Pine as specimen, when the medium were super_heated steam and air respectively, the preheating characteristics of wood in wood drying under vacuum-floating pressure were discussed by the measurement of the internal temperature field and the variation of moisture during the stage of preheating. The relationship between drying medium condition and the rate of drying revealed that: Firstly, compared with the process of air-drying, the time needed to be preheated under vacuum-floating decreased dramatically, meanwhile, the magnitude of condensation on the surface was relatively larger. Secondly, the rate of wood drying under vacuum-floating increases coupled with the temperature of medium, the reduction of absolute pressure, and the raise of fluctuation rate of frequency. The sequence of factors' contribution to drying rate was listed as following: the temperature of medium (T)>the fluctuation rate of pressure (H z)>absolute pressure (P).

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