微波干燥锰碳合金球的响应曲面法优化

为了研究微波干燥锰碳合金球新工艺过程,确定各因素对脱水率的影响情况,得到优化工艺参数,文中采用响应曲面法中心组合设计对工艺过程进行设计并分析了干燥温度、干燥时间、物料质量及其交互作用对相对脱水率的影响,建立了关于相对脱水率的数学模型。方差分析表明,干燥温度、干燥时间对相对脱水率有较显著影响,建立的数学模型拟合度良好,获得优化工艺参数:干燥温度90℃,干燥时间176 s,物料质量150.61 g,相对脱水率达到93.96%。实验验证表明,实际值与模型预测值相差0.71%,干燥后锰碳合金球的含水质量分数为0.26%,达到炼钢用锰碳合金球的水分指标。研究表明:模型预测结果可靠有效,应用响应曲面法优化得到微波干燥锰合金球的工艺条件合理可行,为工业化应用提供必要的工艺参数。

Optimization of microwave drying of manganese-carbon alloy ball by using response surface methodology

The process of microwave drying manganese-carbon alloy ball was investigated.The optimum conditions for the process were determined by using response surface methodology(RSM).Central composite experimental design(CCD) was employed to evaluate the relationship between the input variables including drying temperature,drying time,the mass of material,and the interaction on the corresponding relative dehydration rate.A second-order polynomial model was obtained for predicting the response.The analysis of variance(ANOVA) shows that drying temperature and drying time have the most significant influences on the relative dehydration rate.More than 96.73% of the variation was explained by the models.Over the range studied,the optimum conditions for the relative dehydration rate are as follows: temperature 90 ℃,time 176 s,material mass 150.61 g,respectively.The predicted relative dehydration rate is 93.96%.Under these conditions,the actual experimental value is 93.25%,which agrees well with the predicted values.The moisture mass fraction of material is 0.26% after microwave drying,which is able to reach the industrial requirement.The results show that predictive model is accurate and effective and the technology of microwave drying of manganese-carbon alloy ball is reasonable and feasible.