基于plc的燃油锅炉控制系统设计论文.pdf

基于PLC 的燃油锅炉控制系统设计 摘 要 目前燃油锅炉的应用越来越广泛，对燃油锅炉的科学研究也越来越 多。为解决我国燃油锅炉产业现状存在的主要问题，采用PLC 等控制技 术和设备对我国燃油锅炉控制系统进行适当改造。FX2N 系列PLC 改造的 燃油锅炉控制系统，根据自动控制基本原理实现了锅炉更高效率和更高 可靠性的启动、停止、暂停和异常处理；在此控制系统中对锅炉燃烧各 项参数等可进行高效检测、校正和调节；其中锅炉水位、压力等参数控 制亦可由PLC 实现控制。 首先是对燃油锅炉基本结构组成和运行原理进行研究和分析；主要 研究WNS 型卧式燃油锅炉，根据燃油锅炉控制系统的工艺要求设计控制 方案；设置好具体参数，进行PLC 的I/O 口的估算和分配，选择三菱FX2N 系列PLC 作为控制系统核心，在此基础上设计出控制系统外部接线图， 并对其它组成部件如变频器、电机等进行选择；最后根据系统流程图进 行主电路接线图的设计，完成梯形图，最后进行程序的校验和仿真。 关键词 PLC, 燃油锅汽包水位 ： Design of the boiler burner control system based on plc Abstract The application of fuel boiler is more and more extensive, scientific study of the oil-fired boiler is also more and more. In order to solve the current problems of fuel boiler industry in China, using PLC control technology and equipment appropriate modification of control system of fuel boiler in china. Fuel boiler control system of FX2N series PLC transformation, according to the basic principle of the automatic control of boiler high efficiency and high reliability of the start, stop, pause and exception handling; the boiler combustion parameters can effectively detect, correction and adjustment in the control system of boiler water level; wherein, parameters suc as pressure control can realize control by PLC. The first is the researc and Analysis on the basic structure of fuel boiler components and operating principle; the main researc WNS horizontal oil-fired boiler, according to the process control system of fuel boiler design requirements of control scheme; set up specific parameters, estimation and allocation of PLC I/O port, select the Mitsubishi FX2N series PLC as the core of control system, based on the control system design of external wiring diagram, and other components such as the inverter, motor selection; finally, according to the design