红枣片远红外辐射干燥的干燥特性及Vc变化课件.doc

红枣片远红外辐射干燥的干燥特性及Vc变化 万江静，郑 霞*，高振江，肖红伟，唐明祥，王 高 （大学机械电气工程学院，新疆石河子832000） 摘 要：采用远红外辐射干燥技术对半干红枣进行了泥制枣片加工，通过单因素实验研究了枣片在不同的辐射温度（55、60、65、7075 ℃）、片厚（2、46 mm）和辐射距离（80、110140 mm）下的干燥特性、水分有效扩散系数、干燥活化能和Vc含量变化，并分析了不同干燥因素对干燥时间和Vc的影响，结果表明：辐射温度、片厚和辐射距离对枣片的红外干燥时间以及Vc含量均显著。在条件内，不同因素对干燥时间的影响显著性顺序为：辐射距离片厚温度，不同因素对Vc含量的影响显著性顺序为：温度辐射距离片厚；枣片整个干燥过程属于降速干燥，水分有效扩散系数在1.10674~9.67179×10-10 m2/s的范围内，干燥所需的干燥活化能为53.79 kJ/mol。辐射温度对枣片的Vc影响最当辐射温度65 ℃，辐射距离110 mm，片厚4 mm时，干燥速率快且Vc含量保持较高。 关键词：远红外枣片干燥活化能Vc 中图分类号：S375 文献标识码：A 文章编号Red jujube sheet of far-infrared drying characteristics and the changes of Vc WAN Jiang-jing, ZHENG Xia*, GAO Zhen-jiang, XIAO Hong-wei, TANG Ming-xiang,WANG Gao （College of Mechanical and Electric Engineering, Shihezi University, Shihezi 832000, China) Abstract: The far-infrared drying technical was used to red Jujube mud on half-drying red jujube at this article. The water effective diffusion coefficient of the red jujube, dry activation energy and the changes of Vc content was studied through the single factor experiment in different radiation temperature (55, 60, 65, 70 and 65 ℃), slice thickness (2, 4 and 6 mm) and radiation distance (80, 110 and 140 mm) of the drying characteristics. The research results showed that it had much significant impact of jujube infrared drying time and Vc content under the different radiation temperature（p＜0.05）, slice thickness and radiation distance. Under the test conditions, the influence of different factors on the drying time significant order: The radiation distance（p=0.001） the piece of thick （p=0.002） the temperature（p=0.003）, and the influence of different factors on the Vc content in significant order: the temperature （p0.001） the radiation distance（p=0.001） the piece of thick（p=0.032）. The whole drying process of Jujube sheet belong to slow down drying. The water effective diffusion coefficient was 1.10674×10-10~ 9.67179×10-10 m2/s and the required drying activation energy was 53.79 kJ/mol. Radiation tem