模糊PID控制在晶化釜升温曲线控制中的应用

晶化釜是某催化剂生产装置中的关键设备，而其升温曲线的控制精确性直接影响产品的质量，常规PID控制算法难以满足控制要求。针对升温曲线必须严格满足理论曲线的控制问题，提出了采用模糊PID控制策略来控制升温曲线的方法，在仔细分析晶化釜加热系统的构成和控制要素的基础上，采用了以温度值和升温速度为输入，可控硅的开度值为输出的双输入单输出的模糊算法，并根据试验参数设计了模糊算法的推理原则，针对温度曲线恒温段的特点，采用PID算法来控制恒温温度；最后在PCS7系统中，采用参数表和标准温度PID控制功能块相结合的方式，实现了该控制算法。实际的工程应用结果表明，通过采用正确参数的模糊PID控制策略能使晶化釜升温曲线与设定的温度曲线的误差不超过5‰，可以满足实际生产的需要。

Application of fuzzy PID control system for heating curves of crystallization axe

The control of the heating curve of crystallization axe which is the key equipment of the catalyst production device is beyond the performance of the usual PID. Aiming at keeping up the heating curve with the theoretical curve strictly which is critical to the quality of the final production, a new control strategy of fuzzy PID control method was presented to control the heating curve. Based on analysis of the characteristics and elements of the heating system, the two input and one output fuzzy module which the temperature value and rate of temperature were used as inputs and the opening value of controlled silicon was used as output, was adopted as well as to keep the temperature stability in the constant phase of the heating curve, the standard PID module was also adopted. The reasoning principles were also studied. Conbined with parameter list and standard temperrature control function block in PID, the control strategy based on the Siemens SIMATIC PCS7 was introduced in the following. The practical applications results indicate that the error between the heating curve and the theoretical curve could be reduced to within 0. 5 percents by this strategy.