文档介绍：摘要
汽包水位是影响锅炉安全运行的一个重要参数,汽包水位过高或者过低的后果都非常严重,因此对汽包水位必须进行严格控制。PLC技术的快速发展使得PLC广泛应用于过程控制领域并极大地提高了控制系统性能,PLC已经成为当今自动控制领域不可缺少的重要设备。
本文从分析影响汽包水位的各种因素出发,重点分析了锅炉汽包水位的“假水位现象”,提出了锅炉汽包水位控制系统的三冲量控制方案。按照工程整定的方法进行了PID参数整定,并进行了仿真研究。根据控制要求和所设计的控制方案进行硬件选型以及系统的硬件设计,利用PLC编程实现控制算法进行系统的软件设计,最终完成PLC在锅炉汽包水位控制系统中应用。
关键词:汽包水位三冲量控制 PLC PID控制
ABSTRACT
The steam drum water level is a very important parameter for the boiler safe operation, both high and low steam drum water level may lead to extremely serious consequence; therefore it must be strictly to be controlled. With the rapid development of PLC technology, it can widely be applied to the process control domain and enhances the performance of control system enormously. PLC has already e the essential important equipment in automatic control domain.
Based on the analysis of all kinds of factors which influence steam drum water level, “unreal water level phenomenon”is analyzed specially, and three impulses control plan for steam drum water level control system is proposed. PID parameters are regulated by engineering regulation method, and simulation study is done. According to the needs of control, the selection of control requirements hardware and system hardware design as well as system software design are carried out. Finally the application of PLC in boiler steam drum water control system pleted.
Key words: Steam drum water level Three impulses control PLC PID control
目录
1绪论 1
1
2
2控制方案设计 4
4
7
3硬件选型 13
13
14
16
17
17
18
18
PLC及相关模块的选型 19
22
4硬件设计 25
25
控制线路设计 28
5控制算法及参数整定 30
PID算法简介 30
三冲量控制系统参数整定 31
6软件设计 39
程序流程设计 39
网络组态 41
RSLogix5000程序设计 44
7监控界面设计 50
8结束语 53
参考文献 55
致谢 56
附录 57
1绪论
蒸汽锅炉是企业重要的动力设备,其任务是供给合格稳定的蒸汽产品,以满足负荷的需要。锅炉是一个十分复杂的控制对象,为保证提供合格的蒸汽产品以适应负荷的需要,与其配套设计的控制系统必须满足各主要工艺参数的需要。保持锅炉汽包水位在正常范