石家庄科技信息职业学院
毕 业 论 文
题目： 变频调速在供暖锅炉控制（PLC控制）
学 号： 姓 名： 专业班级： 指导教师： 完成日期： 2010-12-07
变频调速在供暖锅炉控制（PLC控制）
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越来越高的要求。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。
该控制系统以两台工业控制机作为上位机，以西门子S7-300可编程控制器为下位机，系统通过变频器控制电动机的启动、运行和调速。上位机监控软件采用三维力控PCAuto3.6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，并接收上位机的控制指令以完成风机启/停控制、参数设定、循环泵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。
关键词: 锅炉控制;变频调速技术;PLC;组态软件
Abstract
Along with social economy's swift development, the urban construction scale's unceasing expansion, as well as the people 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 system, 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 two industry cybertrons, west of family household S7-300 programmable controller for lower position machine, system through frequency changer control motor's start, movement and velocity modulation. The superior machine monitoring software uses the three dimensional strength to control the PCAuto3.6 design, mainly completes the system operation contact 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 Siemens'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 control system has realized the boiler combustion process automatic control, the systems operation is stable, is reliable. Uses boiler's computer control and the frequency conversion control not only may save the energy greatly, the promotion environmental protection, moreover may raise the production automation level, has the remarkable economic efficiency and the social efficiency.
Key word: Boiler control; Frequency conversion velocity modulation technology; PLC; Configuration software
目录
摘要 ......................................................... 2 Abstract ..................................................... 3 目录 ................................................................... 4 第一章绪论 ................................................... 7
1.1 项目背景及课题的研究意义 .............................. 7 1.2 供暖锅炉控制的国内外研究现状 .......................... 8 1.3 本文所做工作 .......................................... 9 第二章 变频调速在供暖锅炉控制中的应用 ......................... 9
2.1变频调速基本原理 ....................................... 9 2.2变频调速在供暖锅炉系统中的应用 ........................ 10 2.3变频调速节能分析 ...................................... 11 第三章 锅炉控制系统原理 ...................... 错误！未定义书签。
3.1引言 ................................................. 13
3.1.1偏差控制方式 ..................................... 13 3.1.2 PID控制方式 ..................................... 14 3.2循环流量控制 .......................................... 17 3.3燃烧过程控制 .......................................... 17 第四章 锅炉控制系统总体设计 .................. 错误！未定义书签。
4.1系统功能分析 ........................... 错误！未定义书签。 4.2系统方案设计 ........................... 错误！未定义书签。
4.2.1总体设计思路 ...................... 错误！未定义书签。
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