1、 摘摘 要要 汽包水位是影响锅炉安全运行的一个重要参数，汽包水位过高或者过 低的后果都非常严重，因此对汽包水位必须进行严格控制。PLC 技术的快 速发展使得 PLC 广泛应用于过程控制领域并极大地提高了控制系统性能， PLC 已经成为当今自动控制领域不可缺少的重要设备。 本文从分析影响汽包水位的各种因素出发，重点分析了锅炉汽包水位 的“假水位现象” ，提出了锅炉汽包水位控制系统的三冲量控制方案。按照 工程整定的方法进行了 PID 参数整定，并进行了仿真研究。根据控制要求 和所设计的控制方案进行硬件选型以及系统的硬件设计，利用 PLC 编程实 现控制算法进行系统的软件设计，最终完成 PLC 在锅
2、炉汽包水位控制系统 中应用。 关键词：关键词：汽包水位 三冲量控制 PLC PID 控制 ABSTRACT The steam drum water level is a very important parameter for the boiler safe operation, both high and low steam drum water level may lead to extremely serious consequence; therefore it must be strictly to be controlled. With the rapid development
3、 of PLC technology, it can widely be applied to the process control domain and enhances the performance of control system enormously. PLC has already become the essential important equipment in automatic control domain. Based on the analysis of all kinds of factors which influence steam drum water l
4、evel, “unreal water level phenomenon”is analyzed specially, and three impulses control plan for steam drum water level control system is proposed. PID parameters are regulated by engineering regulation method, and simulation study is done. According to the needs of control, the selection of control requirements hardware and system hardware design as well as system software design are carried out. Finally the application of PLC in boiler steam drum water control system is completed. Key words:
