果脯隧道式干燥机温湿度监控系统设计与试验

Monitoring and Controlling System of Temperature and Humidity for Tunnel-type Dryer

设计了果脯隧道式干燥机多段温湿度监控系统。系统以可编程控制器与工控机为控制中心,基于组态软件的二次开发,对隧道式干燥机多段变温变湿干燥过程的温度、湿度和干燥时间进行实时监控和集中管理。运行试验表明,该系统实现了温湿度的参数设置、实时动画显示、趋势曲线、数据库查询、报表输出打印等功能,温度控制精度为2℃,相对湿度控制精度达到8%。

The temperature and humidity monitoring and controlling system in a tunnel-type dryer was developed,based on supervisory control and data acquisition（SCADA） systems,industrial personal computer（IPC） and programmable logic controller（PLC）.The customized IPC software of monitoring and controlling system monitors real-time temperature and humidity through the communication between IPC and PLC.The software functions realized drying processing parameters inputting,real-time data acquisition and displaying,dynamic and historical data curves,database inquiry and report forms printout.The accuracy of temperature and humidity controlling meets with the requirement of the drying room,with the maximum track error as 2℃for temperature and 8%for relative humidity.