Exploring the Effect Rules of Paddy Drying on a Deep Fixed-Bed

In this paper, a series of paddy drying experiments were conducted on a deep fixed-bed and we investigated the effect rules of five influencing parameters on drying time of paddy. By using the quadratic orthogonal rotation combination design, the nonlinea

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College of Engineering, Shenyang Agricultural University, Shenyang 110866, China 2 Institute of Agricultural Product Processing, Chinese Academy of Agricultural Engineering, Beijing 100125, China 3 College of Mechanical Engineering, Shenyang Ligong University, Shenyang 100168, China Abstract. In this paper, a series of paddy drying experiments were conducted on a deep fixed-bed and we investigated the effect rules of five influencing parameters on drying time of paddy. By using the quadratic orthogonal rotation combination design, the nonlinear function between the drying time and the five influencing parameters are built up. Then a detailed study of the qualitative and quantitative effect rules of each influencing factor is elaborated. The results of this paper conclude the rules of how drying parameters influencing the dry time of paddy. And also, it reveals how to reduce paddy drying time and improve the productivity, which have significance in practical productions. Keywords: Drying time  Paddy  Deep fixed-bed drying  Drying parameters

1 Introduction Drying process is very important to post-harvest paddy rice, and also is the weakest link in modernization technology for grain storage. It costs relatively more energy in paddy rice production, and has a complicated exchange process of heat and moisture. Due to intricate interaction of many influence factors, the system of paddy rice drying process is of multifactor and multicriteria. Therefore, analyzing the effect rules of the drying process to obtain low consumption and quality drying parameters is a hard and important work. Drying time is a direct measure for drying energy consumption and drying efficiency, and it is a important influence factor of drying quality. GB1350-1999 stipulates that the standard moisture content of paddy rice purchasing is 14.5 % (w.b), and the sale total would be reduce 0.75 % if moisture content of paddy rice is per more than 5 %. Besides the end moisture content of paddy rice drying, drying energy and drying quality can be controlled through controlling the drying time [1, 12]. However, empirical drying time data in the past is relatively single, and is hard to the requirements of regional planting for paddy rice. Furthermore, the data is more difficult to adapt to many kinds of new drying equipment and many new drying technology. So, this paper take drying time as evaluation index, and the laws of drying parameters effecting on the drying time is discussed, which would Provide the basis to improve the production efficiency and economic indicators assessment. © IFIP International Federation for Information Processing 2016 Published by Springer International Publishing AG 2016. All Rights Reserved D. Li and Z. Li (Eds.): CCTA 2015, Part I, IFIP AICT 478, pp. 473–484, 2016. DOI: 10.1007/978-3-319-48357-3_45

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2 Experimental Materials and Methods 2.1

Materials

The experimental paddy cultivar is ‘Liaojing-294’ mainly planted in Liaoning Province. This cultivar has a yield of 650 kg per acre and its planting area acco