PLC在锅炉定期排污顺序控制系统中的应用毕业论文.doc

沈阳工程学院毕业设计（论文） PLC在定期排污顺序控制系统中的应用 PAGE II PAGE III PLC在定期排污顺序控制系统中的应用 1 - -1- 中文摘要 随着机组容量增大，需要监视的测点不断增多，操作项目越来越多，一个大型火电机组需要监视几千个测点，操作项目多达数百个。如果由运行人员进行监视和操作，不仅增加体力和脑力劳动强度，而且引起心里紧张，容易造成误操作。采用顺序控制后，运行员只须通过一个或几个操作按钮，用尽量少的 步骤去完成某个辅机设备或辅机设备，甚至整个机组的启停任务。因此顺序控制系统在各生产领域中应用也越来越广泛。目前125/135M机组上实现了顺序控制，它已经成为热工控制系统的重要组成部分，为机组的安全经济运行发挥着重要作用。其中PLC在125/135MW机组的顺序控制中得到了广泛的应用。 锅炉定期排污系统就是采用的顺序控制方案。锅炉的定期排污对于电厂的安全运行有着重要的意义。在整个控制系统中采用了紫金桥监控软件，使控制更直观，便捷。使自动控制得到了很大的提高。 关键词:顺序控制、定期排污、PLC、紫金桥监控、自动控制 Abstract With the unit capacity increased, the need for surveillance of the measuring points are increasing, operating more projects, a large thermal power generating units need to monitor thousands of measuring points, operating as many as several hundred projects. If operating personnel to carry out monitoring and operation, which not only increased physical and mental strength, but also caused heart tension easily lead to misoperation. Using sequence control, running through the members only one or a few button operation, the exhaustion of less than one step to complete auxiliary equipment or auxiliary equipment, or even the entire unit commitment tasks. Therefore sequence control system in the production areas of application are increasingly widespread. Currently 125 / 135M units achieved sequential control, it has become Thermal Control System important component of Units of the safe and economic operation play an important role. 125/135MW PLC in which the sequence control unit which has been widely used. Boiler regular sewage system is used in order to control the program. Boiler regular sewage plant for the safe operation of great significance. Throughout the control system used in the bridge Zijin monitoring software to enable more intuitive control and convenience. Automatic control has been so greatly improved. Keywords : sequence control, regular sewage, PLC, Zijin bridge control, automatic control 目 录 TOC \o 1-3 \f \h \z \u 中文摘要 h I Abstract h II 目 录 h III 第一章 引言