闭式空气循环干燥棒香的试验  

Drying Experiments on Tubular Incense Employed Closed Air Drying Cycle

作　　者：郑青榕[1] 蔡振雄[1] 王吉[1] 潘其永[1] 

机构地区：[1]集美大学轮机工程学院,福建厦门361021

出　　处：《集美大学学报（自然科学版）》2010年第2期137-141,共5页Journal of Jimei University：Natural Science

基　　金：福建省科技厅资助项目(2009J10101);福建省高等学校新世纪优秀人才计划支持项目(C14294);福建省教育厅资助项目(JA08148)

摘　　要：依据闭式空气干燥循环的原理建立试验台,选择质量约1.2 kg的大尺寸(直径25 mm、长970 mm)棒香进行试验,分析初始含水率、升温速率、干燥温度和干燥风速对棒香干燥质量的影响.结果表明:棒香与木材的干燥特性相似,升温速率是造成表面开裂的主要原因,而其与干燥温度和循环风量之间的优化匹配则为棒香干燥质量的保障;对试验棒香,初始含水率为66.08%时,循环空气的升温速率、温度和风速应分别控制在0.22℃/min、45～50℃和1.7 m/s;必须根据棒香规格和干燥室容积,确定适宜的干燥运行参数.Analyses were carried out to accurately locate the optimum working condition for tubular incense drying. A closed air drying cycle was employed to set up an experimental unit, about 1.2 kg tubular incense in length of 0. 97 m and diameter 0. 025 m was then selected for comparatively drying tests under different initial water contents, heating rates, drying temperatures as well as circulating velocities of the drying air. Results show that the drying characteristics of the incense are similar to those of timber, and the heating rate iss the most important factor in bending or cracking of incense. Results also reveal that optimization matching on the working condition of the drying air should be undertaken to improve the drying quality, and for the tested sample with an initial water content about 66. 08 %, a better quality of the product incense could be achieved under a drying temperature in range of 45 ～ 50℃ with a circulating velocity and heating rate of the drying air respectively less than 1. 7 m/s and 0. 22 ℃/min. Conclusions are drawn that selection of the working condition for tubular incense drying should be based on the optimization matching results from experiments and dynamic modeling.

关 键 词：棒香 闭式空气干燥循环 升温速率 

分 类 号：TK173[动力工程及工程热物理—热能工程]