基于DCS平台的火电厂凝结水精处理自动化控制毕业设计论文

理工类大学本科毕业设计论文

毕业设计(论文)

作者：学号：

学院：自动化工程学院班级：自动095

专业：□√自动化□测控技术与仪器

所在系：□√控制科学与工程□仪器科学与技术

题目：基于wincc的凝结水精处理控制系统设计

指导者：田海军高级实验师签字：

评阅者：

2013 年6 月吉林

东北电力大学自动化工程学院学士学位论文

摘要

随着电子技术和计算机技术的飞速发展，我国电力工业的技术水平不断提高，以计算机为核心的火力发电厂生产自动控制在实际应用中受到了广泛的重视，发挥着越来越重要的作用。火力发电厂辅机系统，如除灰系统、补给水处理系统、凝结水精处理系统、废水处理系统、输煤系统等也应用了自动化程序控制技术。随着机组容量的不断提高，火力发电厂对锅炉给水的要求也越来越严格，因此凝结水精处理的重要性也被越来越多的人所认识和重视。本文针对华能大坝发电有限责任公司凝结水精处理控制回路出现的问题，比较了传统继电器控制、以PLC为核心的集中控制方案以及分散控制系统 DCS （Distributed Control Systerm）方案的优缺点，提出了采用第三代Des产品PCS7系统对其控制回路进行改造，实现了基于DCS平台的火电厂凝结水精处理自动化控制，论文主要完成了以下工作:

①全面介绍了凝结水精处理系统在火电厂的作用，详细阐述了凝结水精处理系统的工艺流程，重点分析了凝结水精处理控制系统的工作原理以及凝结水精处理系统的Pm控制方式。

②比较分析了火电厂中凝结水精处理控制系统的应用现状及其发展趋势，并根据凝结水精处理控制系统的改造要求，结合现场设备的情况，从经济性、安全可靠、实用性等方面，确定了宁夏华能大坝发电有限责任公司凝结水精处理控制系统总体方案。

③参与完成了凝结水精处理控制系统的硬件设计。主要包括PCS7控制系统的网络结构、PCS7控制系统的硬件结构的设计以及PCS7控制系统其它硬件设备的选型。

④参与完成了PCS7控制系统组态软件、操作员站软件、服务器软件和控制站软件的设计。

⑤基于控制方案的选择、硬件选型和软件程序实现，本文所改造和设计的凝结水处理PCS7控制系统，经现场运行调试结果可以来看，改造后系统不但提高了锅炉给水的质量，而且维护方便，达到了的各项性能指标，从而验证了所设计方案的正确性。最后对全文进行了总结，并对凝结水精处理控制系统的发展进行了展望，指出凝结水精处理控制系统还需经过更长时间的检验，而且在抗干扰技术方面还需进一步实现。

关键词：火电厂，DCS，凝结水精处理，自动控制，PCS7

ABSTRACT

ABSTRACT

As the rapid development of electronic technology and computer technology, the technological level of China's power industry continues to improve, as the core of the computer automatic control of power plant production in the practical application received widespread attention, is playing an increasingly important role. Power plant auxiliary systems, such as ash handling systems, water treatment systems, condensate polishing systems, wastewater treatment systems, coal handling system, also applied the automated process control technology. As the increasing capacity of the units,electric power plants for boiler feed water requirements are more stringent, so the importance of condensate polishing are also more and more understanded and paid more attention . In this paper says Huaneng Power Generation Limited Liability Company Dam condensate polishing control loop problems, and comparing the traditional relay control, PLC as the core of the centralized control scheme and a distributed control system DCS (Distributed Control System) advantages and disadvantages, then proposes Dcs using third-generation products Maes (Meet–all-eustomers,system) system to transform its control loop, based on the realization of the thermal power plant DCS platform condensate polishing automation control, the paper completed the following tasks:

①Comprehensive introduction to the condensate polishing system in the role of thermal power plants, elaborated condensate polishing system process, focusing on analysis of the condensate polishing process control system works and condensate polishing system Pm control.

②Comparative analysis of the thermal power plants condensate polishing control system status and trends of, and in accordance condensate polishing process control system transformation requirements, combined with the scene of the device, from the economy, safety and reliability, usability, etc,and last determine the Huaneng Power Generation Company condensate polishing process control systems overall program.

③Participate in the completion of the condensate polishing process control system hardware design, including PCS7 control system network structure, PCS7 control system hardware structure design and other PCS7 control system hardware equipment selection.

④Participate in the completion of the PCS7 control system configuration software, the operator station software, server software and controller software design.

⑤Based on the selection of control scheme, hardware and software program, designed