On-line Monitoring System for Grain Moisture Content During Dryer Processing

摘要：

A monitoring system was developed for the purpose of measuring and controlling the grain moisture content from the outlet of a dryer during drying process. Concentric cylinder type of capacitance sensor was used to measure the capacitance, which varied with the change of the moisture content and the dielectric constant of grain. The relationship between grain moisture content and oscillation frequency of the sensor as well as grain temperature under uniform flow was determined, and a mathematical model was then developed. In order to achieve the required grain moisture content, the PI control algorithm was used to control the unloading auger speed. Test were conducted with wheat and corn. The experimental result showed that control accuracy at the dryers outlet was within 0.5％ of the required moisture content.

关键词： Moisture content Dielectric constant Capacitance sensor

作者: CHENG Weidong

作者单位: School of Light Industry and Agriculture Engineering,Shangdong University of Technology,P.R.China,255049

会议类型: 国际会议

会议名称: 2007 International Conference on Agriculture Engineering(2007年农业工程国际会议)

会议地点: 河北保定

会议语种:英文

页码: 591-594

在线出版日期: 2007-10-20（万方平台首次上网日期，不代表论文的发表时间）