摘要
随着国家环保法规的进一步完善,特别是对环境的更高要求,将有更多的电厂和二氧化硫排放企业要进行烟气脱硫(FGD:flue gas desulfurization)改造,电厂所普遍采用的石灰石-石膏湿法脱硫工程规模庞大,为系统开发相关的自动化控制系统成了迫在眉睫的问题。本文研究了当今先进的烟气脱硫技术及其控制系统的发展成果,将先进的设计思想和控制理论应用到了烟气脱硫改造实际生产中,并设计了一套烟气脱硫控制系统。
为了保证FGD装置安全、正常运行,本文设计了一种FGD自动控制系统的方案。针对pH值控制的大滞后、参数时变系统,本文采用了PID控制,并对控制算法进行了仿真。仿真试验结果表明,PID控制的效果较理想,验证了方案的可行性。本文设计的方案对火电厂FGD控制系统的设计具有一定的参考价值。
关键词:烟气脱硫;PID控制;MATLAB仿真
Abstract
As the environment laws become stricter, especially a high demand of the environment is put forward. More and more power plants and enterprises which emit sulfur dioxide will be forced to set up a flue gas desulfurization (FGD) system. It is of great importance to develop a highly automatic control system for the limestone-gypsum wet desulfurization which adopt by many power plants abroad. This thesis brings the advanced design and control theories into the practice of FGD, we have developed a distributed control system for the FGD system .
In order to insure the safety running of the FGD device . A control system of FGD is introduced. Based on the special characteristics of the pH value control, such as Pure-lag, parameters time-variable, PID is applied and computer simulation is used. The result indicates that algorithm is less influenced by the environment , it is robust and contains better track ability. The conclusion of this thesis has reference value for the design of FGD control system.
Key words: flue gas desulfurization (FGD);PID control;MATLAB Simulation