摘要
为研究不同热湿处理过程间的相互关系,利用调温调湿箱模拟片烟干燥和复水过程的工艺条件,考察了干燥介质温湿度及不同初始含水率对片烟复水特性的影响。结果表明:①二元Weibull分布模型可用于描述片烟干燥过程动力学,且模型参数α可作为表征干燥进程快慢的特征时间参量;②较低干燥温度(70,80℃)下,片烟复水速率随干燥介质湿度的增加呈明显减小趋势;较高干燥温度(90℃)下,干燥介质湿度对片烟复水速率影响则相对较小。复水平衡含水率随干燥介质湿度的增大而降低,不同温度干燥后的片烟复水平衡含水率差异不大;③相同干燥条件下,随片烟干燥后含水率的降低,其复水速率增加。片烟初始含水率从14%降至5%时,复水过程中的平衡含水率呈先增加后降低的趋势,初始含水率降至5%时,复水过程的平衡含水率减小更明显。
In order to find out the interaction among different heating and moistening processes, the effects of temperature and humidity of drying medium and initial moisture content in tobacco strips on the rehydration characteristics of strips were investigated by simulating the conditions of strips drying and rehydrating in a climate chamber. The results showed that： 1） Dualistic Weibull distribution model could be used to describe the kinetics of strips drying, and the parameter, a, in Weibull model could be used as a characteristic time parameter to characterize the rate of a drying process. 2） At lower drying temperature （70, 80℃ ）, the rehydration rate decreased significantly with the increase of humidity of drying medium; while at higher drying temperature （90℃）, the humidity of drying medium affected strips＇ rehydration rate relatively slightly. Equilibrium moisture content of rehydration decreased with the increase of humidity of drying medium, and there was no obvious difference between the equilibrium moisture content and drying temperature. 3） At the same drying condition, strips＇ rehydration rate increased with the decrease of moisture content in dried strips.When the initial moisture content in rehydration increased first and then content lowered to 5%. strips reduced from 14% to 5%, the decreased, while it decreased more
出处
《烟草科技》
EI
CAS
北大核心
2013年第4期5-8,15,共5页
Tobacco Science & Technology
基金
郑州烟草研究院科技项目"直接干燥复烤工艺技术研究与设备开发"(212009CZ0430)
关键词
片烟
干燥
含水率
复水
Tobacco strip
Drying
Moisture content
Rehydration equilibrium moisture content during obviously when the initial moisture
