双闭环交叉限幅比值控制在锅炉加热控制系统上的应用

工业锅炉燃烧整个过程中,必须控制好燃烧介质量与供风量的比例关系,避免出现冒黑烟和冒白烟现象,达到即节约能源又保证最大的燃烧热效率.通过双交叉限幅比值控制方法来控制该比例关系,得到最佳比值并转化为安全闽限值,将安全阀限值交叉回馈,并与设定值进行比较.使用Siemens S7-300系列PLC,实现了一套"温度串级-双交叉限幅比值"燃烧控制系统,满足了锅炉使用中"定烧"及"温度控制"的需求.

Application of Double-cross-limiting Ratio of Closed-loop Control in Boiler Control System

Throughout the burning process of industrial boiler,the proportion between the burning media and air must be controlled well to avoid producing white or black smoke,thus not only can save energy but can keep the maximum burning efficiency.A double-crossing-limiting ratio control method was proposed which can get the best proportion.The best proportion was transferred to a limited safe value of a valve,which feedbacks across the control loop and compares with the setting value.This method realizes the combin...