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Study on Wood Drying Properties under Vacuum-floating Pressure

Study on Wood Drying Properties under Vacuum-floating Pressure
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摘要 Using Masson pine as specimens, when drying mediums are overheated steam and hot-air respectively, preheating characteristics of wood under vacuum-floating pressure drying are discussed by measurement of internal temperature field and variation of moisture content during period of preheating. The relationship between drying medium conditions and drying rate of wood reveals that, firstly, compared with process of air-drying, time needed to be preheated under vacuum-floating decreased dramatically, meanwhile,the magnitude of condensation on the surface is relatively larger. Secondly, drying rate of wood under vacuum-floating pressure increases coupled with temperature of medium, reduction of absolute pressure,and raise of fluctuation rate of pressure. The sequence of factors contribution to drying rate is listed as following: temperature of medium (t) > fluctuation rate of pressure (f)> absolute pressure (p). Using Masson pine as specimens, when drying mediums are overheated steam and hot-air respectively, preheating characteristics of wood under vacuum-floating pressure drying are discussed by measurement of internal temperature field and variation of moisture content during period of preheating. The relationship between drying medium conditions and drying rate of wood reveals that, firstly, compared with process of air-drying, time needed to be preheated under vacuum-floating decreased dramatically, meanwhile, the magnitude of condensation on the surface is relatively larger. Secondly, drying rate of wood under vacuum-floating pressure increases coupled with temperature of medium, reduction of absolute pressure, and raise of fluctuation rate of pressure. The sequence of factors contribution to drying rate is listed as following: temperature of medium (t) > fluctuation rate of pressure (f)> absolute pressure (p).
出处 《Chinese Forestry Science and Technology》 2004年第4期65-71,共7页 中国林业科技(英文版)
基金 ThisresearchprojectwasfinancedbyChineseFundCommittee(undertheContractNo59876005)andsupportedbytheFundCultivatingtheYoungTalentsofBeijingForestryUniversity(undertheContractNo200304016)
关键词 wood drying vacuum-floating pressure PREHEATING CHARACTERISTICS 松树 木材干燥 预热特性 真空悬浮压力 干燥速率 干燥条件
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