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图书分类号：密级：毕业设计(论文)基于PLC的污水处理控制系统设计DESIGNOFSEWAGETREATMENTCONTROLSYSTEMI摘要随着经济社会的发展，污水排放严重危害到了人们的生活环境质量，设计一种有效的污水处理控制系统具有重要意义。本文通过比较国内外污水处理控制系统的基础上，设计了一种基于PLC技术的污水处理控制系统，具体内容如下：(1)叙述了污水处理的基本原理，完成了系统的总体设计，并绘制了系统硬件主电路图、电源控制电路图和PLC控制电路原理图；(2)应用PLC技术，完成了对总系统的手控和自控模式转换以及系统各部分启停在自控模式下运行的软件设计；(3)应用组态软件实现了对系统流程的监控和操作。仿真调试表明，本论文设计的污水处理控制系统具有生产效率高、可靠性高、工序流程易实现、操作简便等特点，可满足污水处理流程的自动控制需要。关键词污水处理；PLC；软件设计；组态软件IIAbstractWiththedevelopmentofsocietyandeconomy,thedischargedsewageisseriouslyharmfultothequalityofpeople'slivingenvironment,thedesignofanefficientsewagetreatmentcontrolsystemhasimportantsignificance.Comparingwiththedomesticsewagetreatmentcontrolsystem,thethesisdesignedasewagetreatmentcontrolsystemthatwasbasedonthetechnologyofPLC,thespecificcontentsareasfollows:(1)Describedthebasicprincipleofsewagetreatment,completedtheoveralldesignofthesystem,anddrawedthesystemhardwarethemaincircuit,powersupplycontrolcircuitandPLCcontrolcircuit;(2)WiththetechnologyofPLC,completedthesoftwaredesignofatotalsystemfortheconversionbetweenhandcontrolandautomaticcontrolmode,andeachpartofthesystem'sstartingandstoppinginautomaticcontrolmode;(3)Ithadfinishedmonitoringandoperatingthesystem'sprocesses,usingthesoftwareofconfiguration.Simulationexperimentsshowedthat,thedesignofsewagetreatmentcontrolsystemhastheadvantagesofhighproductionefficiency,highreliability,easyrealizationofprocessflow,simpleoperation,andsoon.Itcanmeettheneedofautomaticcontrolofsewagetreatmentprocess.KeywordssewagetreatmentPLCsoftwaredesignconfigurationsoftwareI目录1绪论.............................................................................................................................................11.1研究背景..............................................................................................错误!未定义书签。1.2研究意义..............................................................................................错误!未定义书签。1.3污水处理的研究现状..........................................................................................................11.4本文研究的主要内容与章节安排......................................................................................22系统总体设计方案.....................................................................................................................32.1污水处理介绍......................................................................................................................32.1.1污水处理总体概念....................................................................................................32.1.2常用污水处理基本原理............................................................................................32.2系统的总体设计..................................................................................................................32.2.1工艺总流程设计........................................................................................................32.2.2系统各部分功能分析................................................................................................42.3本章小结..............................................................................................................................53基于PLC的电气控制部分设计.................................................................................................63.1PLC的简介...........................................................................................................................63.1.1PLC选型.....................................................................................................................63.2污水处理系统电气控制系统总体设计..............................................................................63.2.1控制系统方案设计....................................................................................................63.2.2控制系统硬件主电路设计........................................................................................73.2.3PLC的I/O资源配置.................................................................................................93.3本章小结............................................................................................................................114污水处理系统软件设计...........................................................................................................124.1污水处理系统软件设计总体概述....................................................................................124.1.1手动控制模式..........................................................................................................124.1.2自动控制模式..........................................................................................................134.2污水处理各个部分软件的设计........................................................................................144.2.1粗细格栅系统程序..................................................................................................144.2.2进水泵程序..............................................................................................................154.2.3污泥回流泵程序......................................................................................................164.2.4模拟/数字量间的转换..........................................................