热风干燥装置设计与试验

摘要

根据果品干燥特性和热风干燥原理及特点，在分析热风干燥工艺基础上，完成了燃煤热风炉、挡风板和控制系统等主要工作部件及整机的热风干燥装置结构设计，并进行了试验。试验结果表明：将挡风板垂直安装，宽度分别为5、7、10、12cm，距隔板距离分别为0．9、1．9、3．8、5．7m时，干燥室内的风速比较均匀，此时在A面测得各风道处风速在1．5～1．53m／s 的范围内变化。同时，以杏子为研究对象进行干燥试验，将杏子湿基含水率降到15％以下需要64 h，干燥室内干燥不均匀度小于3％，符合结构设计要求。%According to the characteristics of fruit and principle of hot air drying , the drying process is analysised .The main working parts , such as coal stove , wind deflector and circuit control system , and whole drying equipment are de-signed and a test is carried out .Experimental results show that the wind deflector installs vertically , the width are 5 , 7 , 10, and 12 cm, distance from the wall plate are 0.9, 1.9, 3.8, and 5.7 m, the wind speed is relative evenly , and the wind speed is from 1.5 to 1.53m/s on a-side.Apricot is dried by this equipment .It is 64 hours when the apricot mois-ture content on wet basis is below 15%.Dry no-uniformity is less than 3%in dry room .It is meet the requirements of structural design .