文档介绍：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。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 design , pletes 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 , pletes the simulation quantity signal processing , temperature and pressure signal functions and so on PID control , and receives the superior machine mand plete 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, is reliable. Uses boiler’puter control and the freq