杨木真空与常规干燥的对比研究  

Comparision of vacuum drying and conventional drying for poplar wood.

作　　者：贾东宇[1] 冯小江[1] 伊松林[1] 

机构地区：[1]北京林业大学材料科学与技术学院,木材科学与工程北京市重点实验室,木质材料科学与应用教育部重点实验室

出　　处：《北京林业大学学报》2009年第S1期108-111,共4页Journal of Beijing Forestry University

基　　金：国家自然科学基金项目(30871978);"948"国家林业局引进项目(2005-4-61);教育部科学技术研究重点项目(105026)

摘　　要：该文以尺寸规格为60 mm×60 mm×300 mm的杨木为试材,在干燥温度分别为65、85℃,常规和绝对压力为0.02 MPa的真空干燥条件下,对试件干燥速率及内部温度场进行了测量及对比分析。结果表明:①真空干燥速率是常规干燥速率的2.5~3.2倍,且随着干燥温度的增加,倍率增加。②纤维饱和点(FSP)以上时,真空干燥速率为常规干燥的2.34~2.88倍;而在FSP以下时为2.90~4.14倍,明显大于FSP以上时的比值。③在干燥初期,真空干燥杨木试件的升温速率快于常规干燥;温度越高,升温速率的差异就越大。65℃时真空与常规干燥升温速率比为2.46,85℃升温速率比为2.85。In this research,using the poplar wood samples with the size of 60?mm×60?mm×300?mm,drying rate and the temperature field inside was surveyed and made a contrastive analysis by samples dried in both conventional drying and vacuum drying which was under the absolute pressure of 0.02?MPa,at the drying temperature of 65℃ and 85℃.The results showed that: the vacuum drying rate of poplar samples was 2.5-3.2 times that of conventional drying,and with the drying temperature increasing,the rate multiple increased;above the fiber saturation point(FSP),the vacuum drying rate was 2.34-2.88 times that of conventional drying,while it was 2.90-4.14 times below FSP,which was obviously greater than that above FSP;during the initial period of drying,heating rate of poplar wood samples was faster in vacuum drying than that in conventional drying,and the higher the temperature was,the bigger the speed differences were.The heating speed ratio of vacuum drying to the conventional drying was 2.46 at 65℃,while it was 2.85 at 85℃.

关 键 词：真空干燥 常规干燥 干燥速率 温度场 

分 类 号：TS652[轻工技术与工程]