豆渣微波热风联合干燥特性研究

【目的】确定豆渣的最佳干燥方法,缩短干燥时间,提高生产效率。【方法】对鲜豆渣进行微波热风联合干燥试验。【结果】在微波功率为80W的条件下微波干燥4min,然后再进行105℃热风干燥75min,豆渣干燥效果良好,较热风干燥时间缩短47.33%。同时构建了豆渣微波热风联合干燥的数学模型ln（-lnMR）=-5.21456＋1.102658P＋0.12594P2＋（1.30009＋0.21457P-0.05214P2）lnt,可较好地描述豆渣干燥过程中物料含水率与干燥时间的关系。【结论】微波热风联合干燥技术能在较短的干燥时间内较大程度地脱除豆渣水分,是一种较佳的豆渣干燥工艺,值得进一步推广应用。

Development of drying method for bean dregs using microwave and hot-air combo

[Objective]A method for drying thin layer bean dregs was developed for reducing the time of drying and enhancing productivity. [Method]The fresh bean dregs were dehydrated using microwave drying, hot-air drying, and combination of microwave and hot-air under different conditions. [Result]The microwave drying of bean dregs for 4 min at 80 W, followed by hot-air drying for 75 min at 105℃ showed the best drying effects on bean dregs. Using the combo method, the drying time was shortened by 47.33% compared to that of hot-air treatment alone without affecting the quality of bean dregs. Further, the mathematical model of combo drying method for thin layer bean dregs was obtained [ln（-lnMR）=-5.21456＋1.102658P＋1.12594P2＋（1.30009＋0.21457P-0.05214P2）lnt], which describes the relationship between water content and drying time during the dehydration process of thin layer bean dregs. [Conclusion]The combo drying method using microwave and hot-air was found very effective for dehydration of bean dregs and reduced the time, and may be recommended for its industrial use.