热风与射频—热风联合干燥玉米种子的对比研究
发布时间：2018-07-17 17:33
【摘要】：论文采用射频为主要热源、辅以热风对流的方式,研究了不同加热速率下,不同初始含水率玉米种子的射频-热风联合干燥动力学及品质,并与不同温度与缓苏频率下玉米种子的热风缓苏干燥动力学及品质进行对比。主要研究结论如下:(1)缓苏处理可以提高下一阶段热风干燥速率,且缓苏频率与热风温度越高,干燥总时间越短。随着缓苏频率下降、热风温度升高,玉米种子综合品质下降;但热风干燥10min后缓苏时,玉米种子发芽率和脱氢酶活性均劣于干燥20min后缓苏,说明缓苏频率过快易对种胚造成损伤。基于干燥动力学及品质综合评分结果,热风干燥20min后缓苏、热风温度40℃为热风干燥最优工艺。(2)玉米种子射频-热风联合干燥可显著提高干燥速率。相同的玉米初始含水率下,随着极板间距的减小,干燥速率加快,玉米品质综合评分下降;相同极板间距下,玉米初始含水率越高,越有利于保持较好的综合品质。玉米初始含水率越低,其在射频-热风联合干燥初期的干燥速率越高,但射频对其结构的破坏也越大,因此,干燥后期,其干燥速率越慢。基于干燥速率及品质综合评分结果,玉米初始含水率29.21%、极板间距160mm为射频-热风联合干燥最优工艺。(3)射频-热风联合干燥装载量是热风干燥的3倍,但其干燥时间仅为热风缓苏干燥的1/3。与应力损伤、种子活力相关的指标(除发芽率外)明显优于热风干燥;由于射频-热风联合干燥下物料温度略高于热风干燥,其与温度紧密相关的营养成分指标略逊于热风干燥样品,但差异不显著。经射频-热风联合干燥,玉米种子脱氢酶活性更高,但发芽率明显低于热风干燥样品,破休眠试验结果表明,其原因可能是射频处理引起了种子休眠现象。
[Abstract]:In this paper, the radiofrequency (RF) was used as the main heat source and the hot air convection was used to study the drying kinetics and quality of maize seeds with different initial moisture content under different heating rates. The drying kinetics and quality of maize seeds under different temperature and frequency were compared. The main conclusions are as follows: (1) the drying rate of hot air in the next stage can be increased by the gentle Su treatment, and the higher the frequency and the temperature of the hot air, the shorter the total drying time. The comprehensive quality of maize seeds decreased with the decrease of the frequency and the temperature of hot air, but the germination rate and dehydrogenase activity of maize seeds were lower than those of dry 20min, but the germination rate and dehydrogenase activity of maize seeds were lower than those of dry 20min, but the germination rate and dehydrogenase activity of maize seeds decreased after drying 10min. The results showed that the frequency of slow sucrose was too fast and easy to cause damage to embryo. Based on the results of drying kinetics and comprehensive quality score, the optimum drying process was hot air drying after 20min drying with hot air temperature of 40 鈩，
本文编号：2130419
[Abstract]:In this paper, the radiofrequency (RF) was used as the main heat source and the hot air convection was used to study the drying kinetics and quality of maize seeds with different initial moisture content under different heating rates. The drying kinetics and quality of maize seeds under different temperature and frequency were compared. The main conclusions are as follows: (1) the drying rate of hot air in the next stage can be increased by the gentle Su treatment, and the higher the frequency and the temperature of the hot air, the shorter the total drying time. The comprehensive quality of maize seeds decreased with the decrease of the frequency and the temperature of hot air, but the germination rate and dehydrogenase activity of maize seeds were lower than those of dry 20min, but the germination rate and dehydrogenase activity of maize seeds were lower than those of dry 20min, but the germination rate and dehydrogenase activity of maize seeds decreased after drying 10min. The results showed that the frequency of slow sucrose was too fast and easy to cause damage to embryo. Based on the results of drying kinetics and comprehensive quality score, the optimum drying process was hot air drying after 20min drying with hot air temperature of 40 鈩，
本文编号：2130419
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