南方农业学报2023，Vol.54Issue(8)：2269-2278,10.DOI:10.3969/j.issn.2095-1191.2023.08.008
初烤烟叶干燥动力学与水分扩散特性分析
Analysis of drying dynamics and moisture diffusion characters of primary cured tobacco leaves
摘要
Abstract
[Objective]To investigate the drying characteristics and moisture diffusion characteristics of different parts of primary cured tobacco leaves,and to provide theoretical basis for optimizing the hot processing techniques of cured to-bacco leaves and reducing energy consumption.[Method]Drying experiments were carried out on leaves and main veins of primary cured tobacco under different hot air temperatures(25,35,45,55 and 65℃)to study the drying kinetics,re-levant drying mathematical models,moisture diffusion coefficients and drying activation energy respectively,and to con-sider the effects of temperature and moisture content on moisture diffusion coefficients to study the changes of moisture diffusion capacity of primary cured tobacco leaves during drying.[Result]The drying rate of both leaves and main veins of primary cured tobacco increased with the increase of temperature,and the overall drying trend was decreasing,and the drying rate of leaves was higher than that of main veins at the same temperature.The fitting results of three models showed that the Page model could accurately describe the drying kinetics of leaves and main veins,with determination coefficients(R2)greater than 0.99000 and root mean square error(RMSE)less than 0.03000.The moisture diffusion coef-ficient of the leaves was 0.97×10-12-14.92×10-12 m2/s,and that of the main veins was 51.72×10-12-1386.53×10-12 m2/s,and the drying activation energy of the leaves and main veins were 58.43 and 69.50 kJ/mol respectively.The moisture diffu-sion coefficients of leaves and main veins both increased with the increase of temperature and moisture content.The rela-tionship models between the moisture diffusion coefficients(D),temperature(T)and moisture content(M)of leaves[D= 2.18×10-10exp(-202.3/T+2.701/M)]and main veins[D=4.60×10-8exp(-245.2/T+1.842/M)]were constructed,accurately describing the changes in moisture diffusion ability of primary cured tobacco leaves during the drying process.[Conclu-sion]The moisture diffusion ability of primary cured tobacco leaves is much smaller than that of the main veins.The estab-lished drying model and moisture diffusion coefficient model can provide support for the process control and numerical simulation of tobacco leaf redrying processing.关键词
初烤烟叶/干燥动力学/水分扩散系数/温度/含水率Key words
primary cured tobacco/drying kinetics/moisture diffusion coefficient/temperature/moisture content分类
农业科技引用本文复制引用
陈家鼎,李爱军,耿宗泽,张豹林,李生栋,任江皓,魏硕,王涛..初烤烟叶干燥动力学与水分扩散特性分析[J].南方农业学报,2023,54(8):2269-2278,10.基金项目
中国烟草总公司科技重点研发项目(110202102007) （110202102007）
中国烟草总公司云南省公司重大科技项目(2021530000241036) Key Research and Development Project of China Tobacco Corporation(110202102007) （2021530000241036）
Major Science and Technology Project of Yunnan Company of China Tobacco Corporation(2021530000241036) （2021530000241036）
