基于PLC的锅炉加热温度控制系统设计

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基于PLC的锅炉加热温度控制系统设计 DESIGN OF BOILER TEMPERATURE

CONTROL SYSTEM

学生学号 学生姓名 学院名称 专业名称 指导教师

摘要

本文主要介绍了工业温度控制的发展前景、S7-200系列PLC的基本知识以及锅炉温度控制系统的工作流程、基本原理和组成结构。通过对锅炉温度控制系统设计要求的分析，给出锅炉温度控制系统的I/O口分配表和系统原理图并且以可编程控制器(PLC)为核心，根据系统的控制要求利用STEP 7编程软件设计系统的梯形图。该系统以电热锅炉加热管为被控对象，锅炉水温为被控参数同时兼顾锅炉内压力及水位等条件，以PLC为控制器，锅炉加热管通电时间为控制参数设计了一个温度控制系统。其中调用了西门子公司PLC中自带的PID模块，以更简洁更方便的方法完成了锅炉温度的自动控制设计。本文从系统的工作原理、系统硬件选型、系统软件编程以及组态监控画面设计等方面进行阐述。 关键词 电热锅炉；温度控制；PLC；PID；固态继电器

Abstract

This article focuses on the industrial development prospects of temperature control, basic knowledge of S7-200 series PLC as well as the boiler temperature control system made up of work processes, principles, and structure.Through the analysis of boiler temperature control system design, I/O port allocation table of temperature control system of the boiler,system schematics and a programmable logic controller (PLC) as the core, according to the control system requires the use of STEP 7 programming software system design of ladder diagram.The system to electric boiler heating tubes to a charged object, parameters of boiler water temperature to be controlled both the pressure and the water level in the boiler and other conditions, the PLC controller, boiler heating power parameter design of a temperature control system for control.Which is called the Siemens PLC comes with PID modules, and a more concise and more convenient way to complete the automatic control system design of the boiler temperature. This paper described the working principle of the system, system hardware selection, system software programming and configuration of the monitor screen design.

Keywords Electric boiler Temperature control PLC PID Solid State Relays