微波干燥MgO涂层响应曲面法优化工艺研究

Study on Optimization Technology of Microwave Drying of Magnesia Coating by Using Response Surface Methodology

对初始含水率>70%的MgO涂层进行微波干燥实验,采用响应曲面法中心组合设计对工艺参数进行优化,实验结果表明:料功比、干燥时间、初始含水率对微波干燥涂层的相对脱水率都有影响。影响的显著程度顺序为:干燥时间>料功比>初始含水率。结合响应曲面优化及产品质量评分的方法得到了第一阶段干燥的最佳工艺条件:微波功率280 W,干燥时间30 min,涂层厚度2.0 mm干燥效率最高,预测的相对脱水率为37.87%,而实测的相对脱水率为37.55%,实验值与预测值偏差为-0.32%,响应曲面优化有效。

Abstract：A MgO coating with initial moisture content over 70% was studied by microwave drying. A response surface methodology central composite experimental design （CCD） was em- ployed to optimization process parameters. The experimental results and analysis showed that the drying time, material power ratio, the initial moisture content, microwave drying time were all present influence on the relative dehydration rates. The significant order of impact ： drying time 〉 material power ratio 〉 initial moisture. Combined the response smaCaces methodology op- timization and product quality scoring method to get the optimum first phase dry conditions： microwave power 280 W, drying time 30 rain, For coatings with 2.0 mm thickness, the pre- dicted relative dehydration rate was 37.87%, while the measured actual relative dehydration rate was 37.55%, the experimental and predicted values of deviation was only -0. 32%, indi- cating the effective response surface optimization.