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师建芳,吴辉煌,娄 正,吴中华,刘 清.豇豆隧道式热风干燥特性和模型[J].农业工程学报,2013,29(11):232-240.DOI:
豇豆隧道式热风干燥特性和模型
投稿时间:2013-01-06  修订日期:2013-05-16
中文关键词:  干燥,模型,动力学,豇豆,隧道式
基金项目:农业部规划设计研究院自选课题(caae201202)
作者单位
师建芳 1. 农业部规划设计研究院农产品加工工程研究所北京 100125 
吴辉煌 2.天津科技大学机械工程学院天津 300222 
娄 正 3. 中国农业大学工学院北京 100083 
吴中华 2.天津科技大学机械工程学院天津 300222 
刘 清 1. 农业部规划设计研究院农产品加工工程研究所北京 100125 
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中文摘要:为了研究豇豆干燥特性以缩短干燥时间,该文利用隧道式热风干燥技术探讨了不同干燥风温(60、70和80℃)、风速(0.3、0.4和0.5 m/s)和料层厚度(6、18和30 mm)对豇豆干燥特性的影响。结果表明:豇豆的隧道式热风干燥前期主要是增速干燥阶段,后期主要是降速干燥阶段。提高干燥风温和风速,较少料层厚度均可缩短干燥时间。豇豆的水分有效扩散系数随着干燥风温和风速的升高而增大,随着料层厚度的增加而降低。通过阿伦尼乌斯公式计算出豇豆的干燥活化能为33.9 kJ/mol。使用决定系数R2、均方根误差RMSE和误差平方和SSE对7种常用干燥模型进行评价,结果表明:Page 模型的平均R2值最大、平均RMSE值和SSE值最小,分别为0.9988、0.01105和0.00286,是描述豇豆隧道式热风干燥的最优模型。研究结果可以为工程实践中预测豇豆隧道式干燥过程的水分变化提供参考。
Shi Jianfang,Wu Huihuang,Lou Zheng,Wu Zhonghua,Liu Qing.Drying characteristics and model of cowpea in tunnel hot air dryer[J].Transactions of the Chinese Society of Agricultural Engineering (Transactions of the CSAE),2013,29(11):232-240.DOI:
Drying characteristics and model of cowpea in tunnel hot air dryer
Author NameAffiliation
Shi Jianfang  
Wu Huihuang  
Lou Zheng  
Wu Zhonghua  
Liu Qing  
Key words:drying, models, dynamics, cowpea, tunnel type
Abstract: Cowpea, also known as beans, black-eyed peas, is an important leguminous vegetable, which is extensively grown in China. Fresh cowpeas having relatively high moisture content must be distributed to customers or processed as quickly as possible in order to prevent microbial fermentation and thermal degradation. Cowpeas resources have great losses as which are putrescible at normal temperatures and pressures, and this severely limits the transportation, storage and process of cowpea, therefore the development of cowpea deep processing is necessary. As Asian people have the habit of eating dried vegetables such as dried cowpea, drying can not only solve the serious problem of huge losses, but also create more economic benefits for farmers; and because most of deep processing technology needs dried cowpea, drying is of great importance as a preprocessing method.  The tunnel type of hot air drying technology has been widely utilized in the drying of carrots, preserved fruits, and plums etc. In this paper, hot air drying characteristics and a drying model of tunnel type of hot air drying technology was studied in drying Cowpea, in order to establish the best model to simulate and predict the water ratio and to provide a technical basis for the industrial application of the control and prediction of the drying process and the tunnel type of hot air drying for cowpea.  The tunnel dryer was made by the Institute of Agricultural Product Processing, Chinese Academy of Agricultural Engineering and College of Mechanical Engineering, Tianjin University of Science and Technology. According to the pre-test results, the drying characteristics of Cowpea was investigated under different air temperatures (70℃、80℃ and 90℃), air velocities (0.3、0.4 and 0.5 m/s) and material thickness (6 mm、18 mm and 30 mm). The empirical relationships between Cowpea moisture then natural logarithmic lnMR and drying time, water effective diffusion coefficient Deff and drying air temperature was established. And then using a MATLAB software system to process a large number of experimental data, afterwards the results were analyzed through nonlinear regression in order to get the function between seven mathematical model equations and the experimental data.  The results show that the drying time can be shortened by increasing air temperature and air velocity and reducing material thickness, and the effect of air temperature and material thickness is more effective than that of air velocity. At different dying conditions, the drying rate always changed from constant-rate drying or quasi-constant-rate drying to falling-rate drying stage at 2.0 g/g dry basis moisture content of cowpea. The moisture effective diffusivity was increased with the addition of the air temperature and air velocity, and decreased with the addition of the material thickness, and the activation energy was 33.9 kJ/mol, which was determined from the Arrhenius equation. According to the statistical parameters, as the correlation coefficient(R2)、root mean square error (RMSE) and sum of squared error (SSE), the Page model was the best suitable to descript the relationship of Cowpea moisture and drying time by the tunnel type of hot air drying, which could be used in production to predict the moisture content on a certain air temperature, air velocities and layer-thickness using tunnel dryer for drying cowpea.
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