热电化学制水控制系统的设计与实现

发布时间：2018-01-27 04:43

  本文关键词： 化学制水 自动控制 可编程控制器 WinCC　出处：《北京工业大学》2014年硕士论文　论文类型：学位论文

【摘要】：本文主要以河北省邢台钢铁有限责任公司动力厂热电化学制水控制系统升级改造项目为研究对象,论述了可编程序控制器(PLC)技术、PID控制技术以及人机接口技术在化学制水领域中的应用。本文主要研究工作包括:(1)介绍了化学制水系统的工艺特点和控制要求,同时论述了化学制水自动控制系统的设计,包括硬件选型、网络配置以及监控系统组态、软件设计等内容。(2)针对现有化学制水处理设备的特点,本文在进行化学制水系统自动化控制系统设计时,硬件选用了SIEMENS公司的S7-300系列PLC作为控制器并进一步介绍了S7-300 PLC的编程环境及编程特点。人机接口硬件设备选用了台湾研华工控机,监控软件开发平台为SIEMENS公司的WinCC V6.2,并采用分布式现场总线PROFIBUS-DP网络实现CPU主站与各I/O从站之间的信息传输。系统控制方式为控制室集中监控与就地操作相结合,运行人员利用CRT上的监控画面可以对整个生产系统监视和控制操作。另外在系统工艺设备附近设有就地操作箱,箱体上设有远控/手动转换开关,便于设备投运前的调试和运行过程中发生故障后的检修。(3)本文针对热电化学制水系统除盐水恒压外供的问题进行了深入的分析;在分析的基础上对液位的恒定控制提出了液位分段控制的策略,并对该策略进行了编程调试和优化,满足了用户的要求。同时,为了保证PLC供电系统的稳定性,对控制系统的供电方式进行了重新设计改造。(4)热电化学制水自动化控制系统现场运行结果表明,该系统能够满足热电厂锅炉补给水处理的自动化控制要求,并且具有可靠性高、运行平稳、控制灵活等优点,达到了客户的设计要求。
[Abstract]:This paper focuses on the upgrading project of thermoelectrochemical water control system in power plant of Hebei Xingtai Iron and Steel Co., Ltd., and discusses the programmable controller (PLC) technology. The application of PID control technology and man-machine interface technology in chemical water production field. The main research work in this paper includes the introduction of chemical water production system technology characteristics and control requirements. At the same time, the design of chemical water automatic control system is discussed, including hardware selection, network configuration, monitoring system configuration, software design, etc.) aiming at the characteristics of existing chemical water treatment equipment. In this paper, the design of automatic control system of chemical water system is carried out. The S7-300 series PLC of SIEMENS is selected as the controller of the hardware, and the S7-300 is further introduced. The programming environment and programming characteristics of PLC. The hardware equipment of man-machine interface is selected by Taiwan Yanhua Industrial Control computer. The monitoring software development platform is WinCC V6.2 of SIEMENS Company. The distributed fieldbus PROFIBUS-DP network is used to realize the information transmission between the CPU master station and each I / O slave station. The system control mode is the combination of centralized monitoring and local operation in the control room. The operator can monitor and control the operation of the whole production system by using the monitoring screen on CRT. In addition, there is a local operation box near the system process equipment, and a remote control / manual switch is arranged on the box body. This paper makes a deep analysis on the problems of desalination constant pressure and external supply of desalted water in the thermoelectrochemical water making system, which is convenient for the commissioning of the equipment before operation and the maintenance after the failure occurred during the operation. On the basis of the analysis, the paper puts forward the strategy of the level control of the constant level, and the strategy is programmed, debugged and optimized to meet the requirements of the users. In order to ensure the stability of the PLC power supply system, the power supply mode of the control system is redesigned and reformed. The system can meet the automatic control requirements of boiler recharge water treatment in thermal power plant, and has the advantages of high reliability, stable operation and flexible control.
【学位授予单位】：北京工业大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TM621.8;TP273
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本文编号：1467599