烟叶加料过程的热质传递特性分析  

Analysis of heat and mass transfer characteristics of tobacco leaf casing process

作　　者：邵禹然 袁锐波[1,2] 陈坤 施涛 李想 胡启明 SHAO Yuran;YUAN Ruibo;CHEN Kun;SHI Tao;LI Xiang;HU Qiming(Mechanical and Electrical Engineering,Kunming University of Science and Technology,Kunming 650504,China;Institute of Hydromechatronics System Integration and Control,Kunming 650504,China)

机构地区：[1]昆明理工大学机电工程学院,昆明650504 [2]光机电液系统集成与控制研究所,昆明650504

出　　处：《重庆理工大学学报（自然科学）》2023年第11期343-351,共9页Journal of Chongqing University of Technology：Natural Science

基　　金：中国烟草总公司科技重点项目(110201402027)。

摘　　要：为探索烟叶加料过程中料液的浸润机制和叶片膨胀变形特性,运用多孔介质连续性理论和弹性理论建立了烟叶加料过程中的热质传递数学模型,基于COMSOL软件实现加料过程中的多物理场耦合,分析了加料过程中烟叶的温度、料液浸润率和膨胀变形的变化规律与相互影响。结果表明:利用COMSOL软件模拟烟叶加料过程,叶片峰值温度为49.25℃,最适加料环境温度为65℃,最终料液浸润率为19.85%,最终叶片膨胀率为8.6%;烟叶的温度变化和料液浸润主要从被料液拍打到的叶片部位开始;叶片内部料液扩散产生的湿应力显著大于温度变化产生的热应力,表明料液的扩散作用对烟叶膨胀变形的影响比温度的影响更大;烟叶的最大等效应力出现在加料过程的15 s左右,并出现在被料液拍打到的部位,表明膨胀变形致使烟叶骨架孔隙变大,扩大了料液扩散通道。烟叶加料过程中的膨胀变形对料液扩散具有积极作用,烟叶内部料液的分布是影响加料均匀性的主要因素。本研究为烟叶加料工艺工序进行优化,可为卷烟数字化生产提供可靠的理论参考。To investigate the infiltration mechanism of material liquid and the expansion and deformation characteristics of tobacco leaves in the casing process,a mathematical model of heat and mass transfer in the process of tobacco leaf casing based on the continuity theory and elastic theory of porous media is built.COMSOL software enables the realization of multi-physical field coupling in the process of casing.An analysis is made of the changes and the influences of temperature,material liquid infiltration rate as well as the expansion and deformation of tobacco leaves in the casing process.The results show:COMSOL software simulating the casing process of tobacco leaves,the peak temperature of leaves is 49.25℃,the optimal casing environment temperature 65℃,the final infiltration rate of material liquid 19.85%,and the final leaf expansion rate 8.6%;the temperature change and material liquid infiltration of tobacco leaves mainly start when the material liquid are beaten onto the leaves;the moisture stress generated by the diffusion of the liquid inside the blade is significantly greater than the thermal stress generated by the temperature change,indicating that the diffusion of the liquid exerts a greater impact than the temperature on the expansion and deformation of the tobacco leaves;the maximum equivalent stress of tobacco leaves occurs at about 15 s after the casing begins,and in the part beaten by the liquid,revealing the expansion and deformation enlarge the tobacco leaf skeleton and the diffusion channel of liquid as well.The expansion and deformation during the tobacco leaf casing process positively affect the diffusion of material liquid,and the distribution of material liquid inside tobacco leaves is the main factor which influences the uniform casing.This study optimizes the tobacco leaf casing process and provides a solid theoretical basis for digital production of cigarettes.

关 键 词：烟叶加料 多孔介质 热质传递 吸湿膨胀 料液浸润率 

分 类 号：F252[经济管理—国民经济]