毕业设计（论文）-基于PLC的锅炉燃烧控制系统的设计.doc

摘 要 随着社会经济的飞速发展，城市建设规模的不断扩大，以及人们生活水平的不断提高，对城市生活供暖的用户数量和供暖质量提出了原来越高的要求。结合现状，本论文供暖锅炉监控系统，设计了一套基于PLC和变频调速技术的供暖锅炉控制系统。 该控制系统以一台工业控制机作为上位机，以西门子S7-300可编程控制机为下位机，系统通过变频器控制电机的启动，运行和调速。上位机监控采用WinCC设计，主要完成系统操作界面设计，实现系统启停控制，参数设定，报警联动，历史数据查询等功能。下位机控制程序采用西门子公司的STEP7编程软件设计，主要完成模拟量信号的处理，温度和压力信号的PID控制等功能，并接受上位机的控制指令以完成风机启停控制，参数设定，循环泵的控制和其余电动机的控制。 本文设计的变频控制系统实现了锅炉燃烧过程的自动控制，系统运行稳定可靠。采用锅炉的计算机控制和变频控制不仅可大大节约能源，促进环保，而且可以提高生产自动化水平，具有显著的经济效益和社会效益。 关键字：锅炉控制；变频调速；组态软件；PLC Abstract Along with social economy’s swift development, the urban construction scale’s unceasing expansion , as well as the peple living standard’s unceasing enhancement , set more and more high request to the city life heating’s user quantity and the heating quality. The union present situation, the present paper heating boiler supervisory sysem, has designed a set based on PLC and the frequency conversion velocity modulation technology heating boiler control system. This control system takes the superior machine by one Industry cybertrons , west of family household S7-300 programmable controller for lower position machine ,system through frequency changer control motor’s start , movement and vclocity modulation .the superior machine monitoring software uses the three dimensional strength to control the WinCC design , mainly completes the system operation contract surface design ,realizes the system to open/stops functions and so on control ,parameter hypothesis ,warning linkage,historical data inquiry. The lower position machine control procedure uses Siemen’s STEP7 programming software design , mainly completes the simulation quantity signal processing , temperature and pressure signal functions and so on PID control , and receives the superior machine control command to complete the air blower to open/stops the control , the parameter hypothesis, the circulating pump control and other electric motor’s control. This article designs the frequency conversion processs automatic control, the systems operation is stable, i