用可编程调节器实现工业锅炉水位控制

Water Level Control in Industrial Boilers by Programmable Controllers

锅炉汽包水位自动调节的任务，是使给水量与锅炉蒸发量相平衡，并维持汽包中的水位在工艺规定的范围内。实践证明，实现锅炉水位控制比较成熟的方案是三冲量串级控制方案。因此，本文针对锅炉水位三冲量常规控制系统及容错微机控制系统在实际应用中出现和存在的问题，从可编程调节器的原理及可靠性入手，结合它本身所具有的优点和各种功能。采用可编程调节器来控制锅炉水位，实现锅炉汽包水位三冲量自动调节，提高锅炉尤其讨论工业锅炉汽包水位控制系统的可靠性。最后，通过可编程调节器具有较强通讯这一功能，阐述了可编程调节器在应用上的开放和扩展性。

Three-stroke series control is a mature technique applied in industrial boilers,but it is subject to lowreliability and other faults;and itce programmable controller is an advanced product suitable for the control system that requires high reliability.This paper describes PC principal,function,advantages and features,and introduces its application in industrial boilers and ito function extension by means of PC’s communication ability.