洗化厂DCS改造方案毕业论文.doc

洗化厂DCS改造方案
摘要
洗化厂生产系统存在能耗高、工艺指标波动大、自控仪表落后、自控水平低等问题，如不进行必要的技术改造，在操作工频繁手动操作的情况下，会造成高投入、低产出且系统波动大的后果，进而影响整个联碱系统的稳定高产。本文运用计算机及网络的先进技术，结合洗化厂老生产系统存在的问题，采用集散控制系统对生产系统进行下列技术改造:
本文完成了以下主要工作:
首先在阅读了大量文献资料的基础上，介绍了火电厂烟气脱硫的主要方法，以及DCS的发展状况;通过对本厂装置原有DCS系统的分析，提出了对DCS改造的要求;介绍了拟选择DCS的特点;改造了洗化厂生产系统的连锁紧急停车系统
其次为实现上述技术方案，控制算法、图形、系统管理、引用和报表组态，确定了仪表及材料的选型，完成了改造的工程预算工作。
最后通过分析以及现场实验和实际运行情况，证明:通过DCS系统的改造提高
了系统安全可靠性，解决了由于无备件给生产构成的威胁。同时，改造后的DCS
对系统控制参数的变化反应更快，系统重新建立平衡的时间更短。系统可靠性和
稳定性均得到提高。
关键词：集散控制系统，节能控制系统，DCS组态，控制算法。
Abstract
Washing plant of the existence of high energy consumption and production systems, process indicators of fluctuations in large, backward-controlled instrument, since
Low level control problems, such as the necessary technology is not in frequent manual operatives, the result in high input, low output and the consequences of large fluctuations in the system, thereby affecting the entire Union high alkaline stability of this system. In this paper, the use of computers and networks, advanced technology, combined with washing of plant production systems exist in the old title, the use of distributed control system for technological transformation of production systems to carry out the following:
This article was completed the following major tasks:
The first after reading a lot of literature on the basis of the introduced thermal power plant flue gas desulphurization of the main ways to and the development of DCS;
Factory installed on the DCS system in the original analysis, put forward the request to the DCS transformation; introduced to select the characteristics of DCS; The transformation of the washing system of factory production chain Emergency Shutdown System
Some of the practical operation curve.
The second technology for the realization of the above-mentioned programs, control algorithms, graphics, system management, configuration references and statements to determine the selection of instruments and materials to complete the transformat