基于响应面法的花椒真空干燥工艺参数优化

摘要

In order to improve the drying rate and drying quality of Zanthoxylum bungeanum and optimal vacuum drying parameters,single factor experiment was used at temperature X1 (50,60,70℃),vacuum X2 (-0.06,-0.04,-0.02MPa),loading X3 (30,40,50g) on the drying characteristics and their reasonable ranges.Based on the single factor experiment,three factors quadratic design of rotary combination was established by drying rate (Y1),total chromatic aberration (Y2),and aperture ratio (Y3) as indicators.Response surface analysis was carried out by Design-Expert software,the regression models were built by three indexes and optimized single target.Finally,using the weighted scoring method combined three models into a comprehensive model.After optimization of the model,the optimal process parameters are:X1 =62.18℃,X2 =-0.054 MPa,X3 =37.23 g.Under the above conditions,the drying rate (Y1) was 0.058 9 g/min,the total chromatic aberration (Y2) was 1.3152,the opening rate (Y3) was 98％.The results were similar with the single target optimization which indicated that the model is reliable.%为了提高花椒的干燥速率和干燥品质,寻求花椒真空干燥的最佳工艺参数组合.采用单因素试验,分别考察温度X1(50、60、70℃)、真空度X2(-0.06、-0.04、-0.02 MPa)、装载量X3(30、40、50 g)对花椒干燥特性的影响程度和各因子的合理范围,在此基础上选取干燥速率(Y1)、总色差(Y2)、开口率(Y3)为评价指标,设计三元二次回归旋转试验,利用Design-Expert软件进行响应面分析,分别建立3个指标的回归模型并进行单目标优化.利用响应面分析因素之间交互作用对各指标的影响程度,最后利用加权评分法将3个模型综合为一个模型并利用SPSS软件进行优化,得到最佳工艺优化参数组合为:X1=62.18℃、X2=-0.054 MPa、X3=37.23 9,此时干燥速率(Y1)为0.056 2g/min,总色差(Y2)为1.315 2,开口率(Y3)为98％,与单目标优化结果接近,模型可靠.