甘蔗皮热风对流干燥特性及数学模型  

Characteristics and Mathematical Model of Hot Air Convection Drying for Sugarcane Skin

作　　者：张雪波 刘显茜[1] 邹三全 赵振超 ZHANG Xue-bo;LIU Xian-xi;ZOU San-quan;ZHAO Zhen-chao(College of Mechanical and Electrical Engineering,Kunming University of Science and Technology,Kunming Yunnan 650504,China)

机构地区：[1]昆明理工大学机电工程学院,云南昆明650504

出　　处：《食品与发酵科技》2021年第5期57-63,共7页Food and Fermentation Science & Technology

基　　金：国家自然基金项目(编号:51566006)。

摘　　要：以甘蔗皮为试材,研究不同甘蔗皮长度、热风温度及热风速度下甘蔗皮的热风对流干燥特性,利用Origin 2018软件对实验数据进行数学模型拟合,得到甘蔗皮的热风薄层干燥模型。结果表明:热风温度升高,甘蔗皮干燥速率增大;热风干燥温度超过100℃,甘蔗皮不但成品色泽变暗,而且干燥过程中还散发刺鼻焦糊气味。增大风速,可以缩短甘蔗皮干燥周期;但是,风速超过4 m/s,进一步增大风速对提升甘蔗皮干燥速率不明显。甘蔗皮长度过短、过长都不利于提升甘蔗皮干燥速率,25cm甘蔗皮干燥速率最大。甘蔗皮热风干燥下(温度为70~120℃)的有效水分扩散系数为(9.221×10^(-9)~2.6262×10^(-8))m^(2)/s,活化能Ea=13.58 kJ/mol。对9种不同数学模型进行拟合,发现Page模型具有最高的R2值和最低的均方根误差RMSE,更适于评估甘蔗皮热风干燥的水分脱除规律。Based on the sugarcane skin,the drying characteristics of sugarcane skin were studied in terms of hot-air temperature,sugarcane size and hot-air velocity.Origin 2018 software was used to analyze date and optimize the mathematical model of sugarcane skin drying.The results show that the hot air temperature increases,the sugarcane skin drying rate increase;the hot air drying temperature exceeds 100℃,the sugarcane skin not only darkens the finished product,but also diffuse a pungent scent during the drying process.Increasing wind speed can shorten the drying period of sugarcane peel.However,when the wind speed exceeds 4m/s,continue to increasing the wind speed has no obvious effect on improving the drying rate of sugarcane skin.Too short and long length of sugarcane skin is not conductive to improving the drying rate of sugarcane skin,and the maximum drying rate of sugarcane skin is 25cm in length.The effective water diffusion coefficient of sugarcane skin under hot-air drying(temperature 70~120℃)is(9.221×10^(-9)~2.6262×10^(-8))m^(2)/s,and activation energy Ea=13.58 kJ/mol.Fitting 9 different mathematical models,it is found that the Page model has the highest R2 value and the lowest root mean square error RMSE,which is more suitable for evaluating the moisture removal law of hot-air drying of sugarcane skin.

关 键 词：甘蔗皮 热风干燥 干燥特性 数学模型 传热传质 

分 类 号：TS209[轻工技术与工程—食品科学]