木材真空干燥中蒸汽潜热回收的理论探讨  

Theoretical Discussion on Recovery of Latent Heat of Vapor during Vacuum Drying of Wood

作　　者：何正斌[1] 伊松林[1] 张璧光[1] 

机构地区：[1]北京林业大学材料科学与技术学院,北京100083

出　　处：《安徽农业科学》2010年第24期13266-13268,共3页Journal of Anhui Agricultural Sciences

基　　金：国家自然基金项目(30871978)

摘　　要：通过对真空干燥过程中过饱和蒸汽形成机理的介绍,运用人工降雨的原理,提出了在真空干燥过程中通过向干燥箱内通入凝结核,能让真空干燥箱内过饱和蒸汽由不可能凝结的同质核化转换为容易凝结的异质核化,从而将水蒸汽凝结时释放的潜热重新利用的设想。运用相关理论,对真空干燥过程中理论节能率进行计算,得到干燥1m3杉木(含水率从60%～10%)可以节约75.074W的能量,理论节能率为45.3%。Through the introduction of the formation mechanism of supersaturated steam during vacuum drying process of wood, using the principle of precipitation, a hypothesis was put forward that if the condensation nucleus were put in the vacuum kiln, the supersaturated steam can be transformed into droplets by heterogeneous-nucleation other than homogenous-nucleation that always happen during wood vacuum drying and release its latent heat that could be reused. Using the related theories, the theoretical energy-saving rate during the vacuum drying process was calculated. It was concluded that 75. 074 W energy could be saved during the drying of 1 m3 fir （water content of 60% - 10% ）and the theoretical energy-saving rate was 45.3%.

关 键 词：真空干燥 过饱和蒸汽 汽化潜热 节能率 水蒸气异质核化 

分 类 号：S781.71[农业科学—木材科学与技术]