基于热重分析的稻米等温干燥动力学

doi:10.12034/j.issn.1009-606X.217160

过程工程学报 ›› 2017, Vol. 17 ›› Issue (6): 1233-1238.DOI: 10.12034/j.issn.1009-606X.217160

基于热重分析的稻米等温干燥动力学

张静¹, 马培勇^1,2*, 邢献军^1,2, 邢勇强¹, 李永玲¹, 武晋州¹

1. 合肥工业大学机械工程学院，安徽合肥 230009；2. 合肥工业大学先进能源技术与装备研究院，安徽合肥 230009

收稿日期:2017-03-06 修回日期:2017-04-13 出版日期:2017-12-20 发布日期:2017-12-05
通讯作者: 马培勇 mapeiyong@163.com

Isothermal Drying Kinetics of Paddy Based on Thermogravimetric Analysis

Jing ZHANG¹, Peiyong MA^1,2*, Xianjun XING^1,2, Yongqiang XING¹, Yongling LI¹, Jinzhou WU¹

1. School of Mechanical Engineering, Hefei University of Technology, Hefei, Anhui 230009, China; 2. Institute of Advanced Energy Technology & Equipment, Hefei University of Technology, Hefei, Anhui 230009, China

Received:2017-03-06 Revised:2017-04-13 Online:2017-12-20 Published:2017-12-05
Contact: Peiyong Ma mapeiyong@163.com

摘要/Abstract

摘要： 通过热重分析研究了干基含水率为21.05%的稻米在40, 50, 60和70℃下的等温干燥动力学. 结果表明，温度越高，最终含水率越低，干燥速率和峰值干燥速率增大. 采用5种不同的等温干燥模型对不同干燥温度下的实验数据进行拟合，所得相关系数R2均高于0.9653，拟合效果较好，其中Midilli?Kucuk模型的R2均高于0.9994，拟合效果最好. 稻米的有效水分扩散系数随干燥温度升高而增大，干燥活化能为5.23 kJ/mol.

关键词: 热重分析, 稻米, 等温干燥动力学, 有效水分扩散系数, 活化能

Abstract: The isothermal drying kinetics of 21.05% dry basis moisture content paddy was studied by thermogravimetric analysis at experimental temperature of 40, 50, 60 and 70℃. The results indicated that the final moisture content of the sample gradually decreased with the drying temperature increasing, the drying rate and the drying rate peak became higher. The five drying models were utilized to fit the different experimental data. The results showed good fitting effect with all models’ R2 (correlation coefficients) more than 0.9653. The Midilli?Kucuk model’s R2 even more significant than others, due to its value larger than 0.9994, which indicated that the Midilli?Kucuk model was the most appropriate model for this experiment. The effective moisture diffusion coefficient would increase with the drying temperature increasing, and the calculated activation energy was 5.23 kJ/mol.

Key words: thermogravimetric analysis, paddy, isothermal drying kinetics, effective moisture diffusivity, activation energy

张静马培勇邢献军邢勇强李永玲武晋州. 基于热重分析的稻米等温干燥动力学[J]. 过程工程学报, 2017, 17(6): 1233-1238.

Jing ZHANG Peiyong MA Xianjun XING Yongqiang XING Yongling LI Jinzhou WU. Isothermal Drying Kinetics of Paddy Based on Thermogravimetric Analysis[J]. Chin. J. Process Eng., 2017, 17(6): 1233-1238.

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基于热重分析的稻米等温干燥动力学

Isothermal Drying Kinetics of Paddy Based on Thermogravimetric Analysis

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