目 录1 引言.......................................................................................................................12 设计方案的拟定...................................................................................................13 系统的结构及工作原理.......................................................................................23.1 系统的结构..................................................................................................23.2 系统的控制原理..........................................................................................23.3 系统的运行方式..........................................................................................33.4 变频调速原理..............................................................................................43.5 PID 调节原理介绍......................................................................................54 提高通风机装置综合效率...................................................................................74.1 风机调速......................................................................................................74.2 调整轴流风机叶片安装角度......................................................................84.3 更换电机......................................................................................................84.4 采纳“子母”风机......................................................................................95 硬件的设计...........................................................................................................95.1 PLC 类型的选用.........................................................................................95.2 变频器类型的选用及接线方式................................................................105.3 瓦斯传感器的选择....................................................................................105.4 压力传感器的选择...............................................................................
