文档介绍：内蒙古科技大学
本科生毕业设计说明书(毕业论文)
题目:基于PLC的火电厂锅炉控制
系统设计
学生姓名:庄国喜
学号:0967112311
专业:测控技术与仪器
班级:测控09-3班
指导教师:闫俊红讲师
基于PLC的火电厂锅炉控制系统设计
摘要
火电厂锅炉是工业生产过程的必要动力设备,锅炉系统安全、稳定、高效运行是火电厂的重要任务。锅炉存在热效率低,燃煤质量不稳定,排烟温度高等问题,利用PLC对锅炉进行过程控制是火电厂锅炉控制领域的重要研究内容。
本设计通过对炉膛温度、炉膛压力、汽包液位及过热器温度的分析,以PLC为控制器、采用PID算法、运用STEP7—Micro/WIN进行梯形图编程,分别设计了炉膛温度串级控制方案、流量比值控制方案,炉压前馈—反馈控制方案,汽包水位三冲量控制方案和过热器串级控制方案,实现了对各个控制系统的自动控制。最后利用人机交互界面,实现了密码登陆,画面动态显示,数据报表的预览、打印、保存、刷新和调入查询,曲线的更新,画面报警等功能,可达到锅炉控制系统安全、稳定、高效运行。
关键词:锅炉;PLC;组态王
The Boiler Control System of Thermal Power Plant Based on PLC
Abstract
The boiler of thermal power plant is the necessary power equipment during the industrial production, boiler system security, stability and efficient operation of power plants is an important task. But boiler thermal efficiency is low; the coal quality is not stable, exhaust temperature is higher, so the boiler process control is an important research field of thermal power plant boiler control using PLC.
Through the analysis of the furnace temperature, furnace pressure, drum level and superheater temperature, the design takes PLC as controller, and uses PID algorithm, completes programming through STEP7 - Micro/WIN ladder diagram. the temperature cascade control scheme, the pressure feedforward—feedback control scheme and the ratio control scheme of the furnace are designed , three impulses control scheme of the drum level and cascade control scheme of superheater are designed too, finally each control system can be run automatically . The interactive interface is designed using the King view software, finally using a password to land is achieved, screen can show ceaselessly, data report preview, print, save, refresh and transferred to the query pleted ,the curve and alarm screen etc can be updated timely. Finally boiler control system can achieve security, stability and efficient operation.
Keywords : Boiler ;PLC;Kingview
目录
摘要 II
Abstract III
第一章绪论 1
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第二章火电厂锅炉生产工艺 3