模糊PID控制器在浸出车间石蜡加热器温度 闭环控制中的应用Application of fuzzy PID controller in temperature closed-loop control of paraffin heater in leaching workshop

石蜡加热器是浸出车间石蜡尾气回收工艺中的重要设备，石蜡加热器温度闭环系统是典型的非线性、时变、不确定性系统，难以建立精确的数学模型。为提高石蜡加热器电动调节阀温度闭环控制效果，以检测石蜡加热器的温度偏差（e）和温度偏差变化率（ec）为输入，模糊PID控制器的KP、KI、KD为输出，构造了二输入三输出的模糊PID控制器。以西门子S7-300 PLC为下位机，WINCC组态软件为上位机，采用STEP 7软件编写模糊PID控制的算法程序，并将程序下载到S7-300 PLC存储卡中,利用S7-300 PLC对电动调节阀开度进行调节，从而实现石蜡加热器温度闭环控制。模糊PID控制器应用于浸出车间石蜡加热器温度闭环控制系统可以减少系统超调量，具有响应速度快、稳定性高等优点，提高了石蜡加热器温度闭环控制系统的运行效率。 Paraffin heater is an important equipment of paraffin vent gas recovery process in leaching workshop. The temperature closed-loop system of paraffin heater is a typical nonlinear, time-varying and uncertain system, which is difficult to establish an accurate mathematical model. In order to improve the temperature closed-loop control effect of electric regulating valve of paraffin heater, taking the temperature deviation e and temperature deviation change rate ec of paraffin heater as inputs and KP, KI and KD of fuzzy PID controller as outputs, a two input three output fuzzy PID controller was constructed. Taking Siemens S7-300 PLC as the lower computer and WINCC configuration software as the upper computer, the algorithm program of fuzzy PID control was compiled with STEP 7 software, and the program was downloaded to S7-300 PLC memory card. S7-300 PLC was used to adjust the opening of electric regulating valve, so as to realize the temperature closed-loop control of paraffin heater. The fuzzy PID controller applied to the temperature closed-loop control system of paraffin heater in leaching workshop can reduce the overshoot of the system, and has the advantages of fast response speed and high stability, thus improving the operating efficiency of the temperature closed-loop control system of paraffin heater.