以微波干燥谷物为基础，开展了在谷物微波干燥前使用超声波预处理强化干燥效果的实验。分别从超声强度、预处理时间和不同装载质量方面进行研究，并进行SPSS相关性分析研究。实验表明:将超声波功率提高到 90%，与未经超声预处理的谷物相比，到达安全水分含量所需时间减少约 27%，而 10 min的预处理时间在经济性和能耗方面更合理，且超声波预处理对微波干燥效率的提高不会因更高的装载质量而明显减弱。SPSS相关性分析研究表明:有/无超声波预处理的谷物含水率变化存在显著差异，不同预处理时间之间的含水率变化也存在显著差异，但更高装载质量之间的谷物含水量变化不存在显著性差异。通过对谷物干燥模型拟合发现:Henderson and Pebis模型拟合度较高(R2>0。97)，可以有效描述超声波预处理下谷物微波干燥过程中水分随时间变化的规律。
Ultrasound-microwave Combined with Grain Drying Characteristics
On the basis of microwave drying of grain,the experiment of using ultrasonic pretreatment before microwave drying of grain was carried out.Ultrasonic intensity,pretreatment time and different loading qualities were studied,and SPSS correlation analysis was carried out.Experiments showed that when ultrasonic power was increased to 90%,the time required to reach the safe moisture content was reduced by about 27%compared with the grains without ultrasonic pretreat-ment.The pretreatment time of 10 min was more reasonable in terms of economy and energy consumption.The improve-ment of ultrasonic pretreatment on microwave drying efficiency would not be weakened by higher loading mass.SPSS correlation analysis showed that there were significant differences in grain moisture content changes with or without ultra-sonic pretreatment,and there were also significant differences in moisture content changes between different pretreatment times,but there were no significant differences in grain moisture content changes between higher loading mass.By fitting grain drying models,it was found that Henderson and Pebis models had high fitting degree(R2>0.97),which can effec-tively describe the rule of water variation with time during microwave drying of grains under ultrasonic pretreatment.
国家科技期刊平台
NSTL
万方数据
