基于模糊控制的火电厂湿法烟气脱硫系统

摘要

火电厂湿法脱硫为多变量、强耦合的连续控制过程,具有控制系统复杂、控制精度不高以及工艺过程复杂和难以建立准确数学模型的特点,因此提出了利用可编程控制器(PLC)对系统进行模糊控制的方法,建立了湿法脱硫系统主参数pH值的模糊自适应PID控制器.通过在张庄电厂湿法烟气脱硫上的应用证明,该方法实现的脱硫效率达到96％以上,将设计脱硫率提高了4个百分点.系统运行稳定、可靠,响应速度快,抗干扰能力强,有较高的推广、应用价值.%According to the wet flue gas desulfurization( WFGD) device of power plant which is a multivari-able, strong-coupling serial control process, and complexity of process engineering and hard-establishment of mathematical model, a plan which implements fuzzy-control algorithm in programmable logic controller( PLC) is put forward, and fuzzy adaptive PID controller for pH is designed. The experience shows that desulfurization ratio is up to 96%, and the desulfurization ratio is improved to 4 percentage point. The system can run reliably, stably, and has fast response and good anti-interference ability as well as promotion and good application value