Empirical modeling and control for spray drying of orange juice powder

L. W. Tan, F. Taip, M. N. Ibrahim, R. Kamil
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引用次数: 4

Abstract

Spray drying is a removal of moisture from liquid feed by breaking into droplets in a hot medium to convert into powder form. In order to ensure the product quality is at the desired specification, a good control system and good understanding on the dynamic behavior should be considered. The aims of this study are to develop empirical model of spray drying process and improve the process by implementation of PI controller. A nozzle atomizer spray dryer, Lab-Plant SD 05 Laboratory Scale Spray Dryer was used. The liquid feed was Sunquick Concentrated Orange Juice and DE 10–15 maltodextrin as the drying agent. The effects of inlet air temperature and maltodextrin concentration on final moisture content and outlet air temperature were investigated. From investigation, the effect of inlet air temperature on moisture content and outlet air temperature was greater than maltodextrin concentration. Thus, inlet air temperature was selected as manipulated variable. For modeling, the model obtained can be represented as first order process with time delay (FOPTD). In order to improve the process, the model obtained was used in simulation studies to determine the suitable tuning method by PI controller. The PI controllers were tuned by direct synthesis, min IAE method and Cohen-coon. From the observation, direct synthesis method is the most suitable tuning method for PI controller in spray drying process.
橙汁粉喷雾干燥的经验建模与控制
喷雾干燥是通过在热介质中分解成液滴转化为粉末形式来去除液体饲料中的水分。为了保证产品质量达到所要求的规格,必须考虑良好的控制系统和对动态行为的充分理解。本研究的目的是建立喷雾干燥过程的经验模型,并通过PI控制器的实现对过程进行改进。采用喷嘴式喷雾干燥机,Lab-Plant SD 05实验室规模喷雾干燥机。液体饲料以Sunquick浓缩橙汁和de10 - 15麦芽糊精为干燥剂。考察了进口空气温度和麦芽糊精浓度对最终水分含量和出口空气温度的影响。从研究结果来看,进口空气温度对水分含量和出口空气温度的影响大于麦芽糊精浓度。因此,选取进风温度作为操纵变量。对于建模,得到的模型可以表示为一阶时滞过程(FOPTD)。为了改进这一过程,将得到的模型用于仿真研究,以确定合适的PI控制器整定方法。采用直接合成法、最小IAE法和Cohen-coon法对PI控制器进行了调谐。从观察结果来看,直接综合法是喷雾干燥过程中最适合PI控制器的整定方法。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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