The former experimental fluidized bed dryer did not arrange the liquid distributor to cause to diffi-cultly even wet solid color silica gel to the saturation. This may lead to increase of the experimental data of crit-ical moisture content and decrease of drying rate,which is hard to determine constant the speed stage of drying speed curve. Therefore,this experimental fluidized bed dryer was improved by using of the tubular conical-hole liquid distributor. The flow field of before and after improvement of experimental fluidized bed dryer was analy-sis by FLUNET numerical simulation. The results showed that the water well distributed in the fluidized bed af-ter improvement of experimental fluidized bed dryer,and its range of scatter was wider. Moreover,the velocity of the water was tended to be stable,and then its velocity difference was 0. 12 times of the former experimental fluidized bed dryer. Consequently,the water more evenly wetted granular allochroic silica gel in order to de-crease experimental error and increase accuracy of experimental result after improvement of experimental fluid-ized bed dryer.%原流化床干燥实验装置没有液体分布器,很难使水均匀润湿固体颗粒变色硅胶使其达到饱和,导致学生做实验时所测得的临界含水率增大,干燥速率变小,干燥速度曲线恒速干燥阶段无法确定,鉴于此,采用管式锥形孔液体分布器改进了原流化床干燥实验装置. 经FLUNET数值模拟分析发现,经改进后,水在颗粒床层内流速分布的均匀性显著提高,其扩散范围也明显扩大,流速更加趋于稳定,且进出口速度差显著降低,减小为原实验装置的0. 12倍,则水可以均匀地润湿床层内的固体颗粒变色硅胶使其达到饱和,从而减小了实验误差,提高了实验结果的准确率.
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