加热状态下云南烤烟的热失重特性及动力学分析  

Thermogravimetric Characteristics and Kinetic Analysis of Yunnan Flue-cured Tobacco Materials under Heating

作　　者：吴键[1] 张贾宝 周国俊[1] 王骏[1] 徐建[1] 梁淼 张峻松 蒋健[1] WU Jian;ZHANG Jiabao;ZHOU Guojun;WANG Jun;XU Jian;LIANG Miao;ZHANG Junsong;JIANG Jian(Technology Center,China Tobacco Zhejiang Industrial Co.,Ltd.,Hangzhou 310008,China;College of Food and Biological Engineering,Zhengzhou University of Light Industry,Zhengzhou 450001,China)

机构地区：[1]浙江中烟工业有限责任公司技术中心,浙江杭州310008 [2]郑州轻工业大学食品与生物工程学院,河南郑州450001

出　　处：《河南农业科学》2022年第10期151-160,共10页Journal of Henan Agricultural Sciences

基　　金：浙江中烟工业有限责任公司科技项目(ZJZY2021A005)。

摘　　要：为考察低温加热状态下烟叶的失重行为从而指导加热卷烟产品设计,利用热重分析技术研究云南烤烟叶片在线性升温-恒温烘焙条件下的热失重特性,考察施加甘油对烟叶失重行为的影响,并对失重过程中的非等温干燥、脱挥发分阶段及恒温烘焙阶段进行了动力学分析。结果表明,中上部烟叶干燥温度区间和最大失重温度较下部叶大,且施加甘油使非等温干燥温度区间变窄,并可提高脱挥发分阶段的最大失重速率和失重率,不同部位烟叶失重率平均提升33.1%,促进烟气的释放;非等温Page干燥模型能较好地描述烟叶脱水干燥过程,施加甘油对不同部位烟叶干燥活化能提升度不一;脱挥发分阶段的热分解动力学符合一级化学反应控制模型,活化能值表现为上部叶>中部叶>下部叶,施加甘油可增加活化能和指前因子;恒温烘焙阶段的分解动力学由二维扩散模型描述,反应速率常数随温度升高而升高,施加甘油升高反应速率常数,提高烘焙反应活化能。不同部位云南烤烟烟叶的热失重特性及动力学参数有所不同,施加甘油可增大烟叶在脱挥发分阶段及恒温烘焙阶段的失重率,有利于烟气释放。In order to investigate the weight loss behavior of tobacco leaves under low temperature heating and to guide the design of heated cigarette products,the thermogravimetric analysis technology was used to study the thermogravimetric characteristics of Yunnan flue-cured tobacco leaves under the condition of linear heating and constant temperature baking.The effects of glycerol addition on the thermogravimetric characteristics of tobacco leaves were investigated,and the kinetics analyses at the stages of nonisothermal drying,devolatilization and constant temperature baking were conducted.The results showed that,the drying temperature range and the maximum weight loss temperature of the middle and upper tobacco leaves were higher than those of the lower leaves,and the application of glycerol narrowed the non-isothermal drying temperature range,and improved the maximum weight loss rate and weight loss rate in the devolatilization stage.The weight loss rate of tobacco leaves in different parts increased by33.1%on average,which promoted the release of smoke.The non-isothermal Page drying model could describe the dehydration and drying process of tobacco leaf well,and the activation energy of tobacco leaf drying was increased by glycerol to varying degrees for different parts.The kinetics of devolatilization was in accordance with the first-order chemical reaction control model,and the activation energy was in the order of upper>middle>lower.Glycerol could increase the activation energy and pre-exponential factor.The decomposition kinetic during constant temperature baking stage could be described by a two-dimensional diffusion model.The reaction rate constant increased with the increase of temperature,and the addition of glycerol could further increase the reaction rate constant and the activation energy of baking reaction.The thermal weight loss characteristics and kinetic parameters of Yunnan flue-cured tobacco leaves are different for different parts.The application of glycerol could increase the weight loss rate of

关 键 词：烤烟 烟叶 非等温干燥 热重分析 动力学 烘焙 

分 类 号：TS45[农业科学—烟草工业] S572