基于AKF-PID的航天气化炉氧煤比先进控制

Advanced Control of Oxygen-to-Coal Ratio in Aerospace Gasifier Based on AKF-PID Control

在航天气化炉生产系统中,氧煤比的自动控制对于提高航天气化炉生产效率具有重要意义。氧煤比的调控通常通过控制煤线流量完成,煤线流量具有大噪声、强干扰特性,人工手动控制无法实现氧煤比的精确控制,使用常规PID控制器无法实现对氧煤比的自动控制。为此,提出一种基于AKF-PID的氧煤比先进控制方法,针对煤线流量大噪声的特性,采用自适应卡尔曼滤波器(AKF),在保证滤波效果的同时避免了均值滤波带来的时间滞后;针对强干扰特性,将给料罐与烧嘴压差作为前馈量,克服煤线压力波动干扰造成的产品质量下降问题。该算法已成功投运,极大地改善了氧煤比的控制品质。

In the gasifier production system,the auto-control of oxygen-to-coal ratio means great to improve production efficiency.The control of the oxygen-to-coal ratio is usually implemented by controlling flow rate of the coal line,which boasts of large noise and strong disturbance and the conventional PID controller,including the manual control,fails to control it accurately.In this paper,an advanced control method for the oxygen-to-coal ratio was proposed based on AKF-PID.Through considering the characteristics of large noise in coal flow,it has adaptive Kalman filter(AKF)adopted to avoid the time lag caused by mean filter while ensuring the filtering effect,including aiming at strong interference characteristics,having the pressure difference between feeding tank and burner taken as the feedforward quantity to overcome product quality degradation caused by the coal line’s pressure fluctuation interference.The advanced control method proposed has been put into operation successfully and it can improve control quality of the oxygen-to-coal ratio.