杉木常压过热蒸汽干燥工艺研究  

Study on the Atmospheric Pressure Superheated Steam Drying Technology of Chinese Fir

作　　者：刘颖 李贤军[1] 郝晓峰[1] LIU Ying;LI Xian-jun;HAO Xiao-feng(College of Materials Science and Engineering,Central South University of Forestry and Technology,Changsha 410004,P.R.China)

机构地区：[1]中南林业科技大学材料科学与工程学院,长沙410004

出　　处：《林产工业》2020年第11期4-9,共6页China Forest Products Industry

基　　金：湖南省科技重大专项“速生人工林绿色产业链循环增效关键技术创新与应用”(2017NK1010);“十三五”国家重点研发计划项目“木材节能备料与质量控制技术研究”(2016YFD0600701)。

摘　　要：系统研究了杉木常压过热蒸汽干燥特性,结果表明:初含水率、锯材厚度和干燥温度对杉木过热蒸汽干燥的干燥速率和干燥质量有明显影响。随着初含水率的升高、锯材厚度的降低或干燥温度的升高,其干燥速率逐渐升高;当初含水率不超过30%、干燥温度不超过140℃时,锯材干燥质量较好。通过试验获得优化杉木过热蒸汽干燥工艺,在此基础上进行企业生产性中试研究,最终得出较为成熟的杉木锯材过热蒸汽干燥技术。研究表明:30%左右初含水率的杉木锯材采用140℃过热蒸汽干燥可实现其快速高效干燥,整体干燥质量良好,耗能少,且无废气排出,干燥过程高效、节能、环保。The drying characteristics of Chinese fir by superheated steam under atmospheric pressure were systematically studied.The results showed that the initial moisture content,timber thickness and drying temperature had significant effects on the drying rate and quality of Chinese fir.With the increase of initial moisture content,the decrease of timber thickness,or the increase of drying temperature,the drying rate of sawn timber increased significantly.When the initial moisture content was less than 30%and the drying temperature was not more than 140℃,the drying quality of sawn timber was better.Furthermore,the optimized parameters of superheated steam drying process was obtained,and the pilot production test of the enterprise was carried out.The results showed that the rapid and efficient drying could be achieved by using 140℃superheated steam with 30%initial moisture content.At this time,the drying quality was well,and the overall energy consumption was less with no pollution in gas emission.Hence the drying process is highly efficient,energy-saving and environmental-friendly.

关 键 词：速生杉木 过热蒸汽干燥 优化工艺 干燥质量 生产性中试研究 

分 类 号：TS652[轻工技术与工程]