油茶果热风干燥爆蒲后茶籽传热传质特性及干燥工艺优化  

Heat and mass transfer characteristics and drying process optimization of Camellia oleifera seeds after hot air drying and shelling of the fruits

作　　者：黄建江 郭子洋 李圣陶 张烨[1] 李长友[1] 李涛[2] 李成杰 HUANG Jianjiang;GUO Ziyang;LI Shengtao;ZHANG Ye;LI Changyou;LI Tao;LI Chengjie(College of Engineering,South China Agricultural University,Guangzhou 510642,China;College of Engineering,Jiangxi Agricultural University,Nanchang 330000,China)

机构地区：[1]华南农业大学工程学院,广州510642 [2]江西农业大学工学院,南昌330000

出　　处：《农业工程学报》2024年第23期332-341,共10页Transactions of the Chinese Society of Agricultural Engineering

基　　金：国家自然科学基金项目(32171906,32101637,32401725);广州市科技计划项目(2024A0J3960)。

摘　　要：为深入挖掘油茶果热风干燥爆蒲后茶籽内部水分和温度变化规律,找到一种低耗、高效的干燥工艺参数,该研究通过试验测定了油茶籽导热系数、密度等物性参数,计算得出油茶籽有效水分扩散系数的Arrhenius关系式,引入传热传质的数学建模理念建立了油茶籽传热传质模型,模型预测值与试验数据吻合较好,最大误差不超过8.5%。基于上述模型,研究了油茶籽的变温干燥工艺,经过响应面优化后的干燥参数为前期风温63.7℃、水分转换点38.5%、后期风温74.8℃,在此干燥条件下,单位能耗为5.040 kJ/g,干燥速率为0.048 g/(g·h),与试验指标的回归模型预测结果相比,其相对误差分别为7.4%和12.1%。该研究提出的干燥工艺参数可为油茶果干燥爆蒲方法的产业化推广提供理论依据和应用参考。This study aims to elucidate the dynamics of moisture and temperature alterations in Camellia oleifera seeds during hot air drying and subsequent bursting.A systematic investigation was carried out to optimize the parameters for superior drying.The exceptional energy efficiency was characterized by minimizing energy consumption.The physical attributes of Camellia oleifera seeds were measured to determine their inherent properties,including thermal conductivity and density.The thermodynamic behavior of Camellia oleifera seeds was explored during drying at distinct temperature intervals of 52,62,and 72°C.According to Fick's Second Law,the effective moisture diffusion was then obtained corresponding to each temperature regime.An Arrhenius equation model was constructed in the empirically derived data on effective moisture diffusivity using reverse engineering.There was a significant correlation between effective moisture diffusivity,drying temperature,and activation energy.At the same time,a mathematical framework was designed to combine the heat and mass transfer,in order to simulate the drying of Camellia oleifera seeds.The predictions exhibited striking consistency with the experiments,with a maximum error of 8.5%,indicating the remarkable precision and reliability of the model.The results show that the hot-air drying dynamics of Camellia oleifera seeds were fundamentally dominated by internal mass transfer.The higher moisture gradients were observed than those of temperature ones.The fluctuation of drying rates shared a uniform pattern over the varying drying temperatures.The effective moisture diffusivity of Camellia oleifera seeds increased significantly over the temperature spectrum from 52°C to 72°C,ranging from 3.2994×10-10−5.5826×10-10 m2/s.The energetic transformations were computed as the activation energy of 25.025 kJ/mol during drying.Therefore,the variable temperature drying was performed better for Camellia oleifera seeds.There was the governing impact of three parameters—the initial wind te

关 键 词：工艺优化 模型 油茶 爆蒲 传热传质 热风干燥 

分 类 号：TS222.1[轻工技术与工程—粮食、油脂及植物蛋白工程]