针对精馏塔温度系统结构复杂和精确度要求高等特点,采用西门子S7-300可编程控制器PIE对系统温度进行控制.控制回路采用单参数模糊PID调制法;同时,将单参数模糊PID控制和可编程控制器的逻辑判断指令结合起来,使PID控制更为灵活,较好地满足了生产过程的要求.实际运行结果验证了PLC应用于精馏塔温度控制系统的可行性及精确性.%Aiming at the features of the temperature system of fractionating tower, i.e.complex structure and high precision requirement, the temperature is controlled by adopting Siemens S7-300 programmable controller.The single parameter fuzzy PID modulation method is used in the control loop.In addition, the single parameter fuzzy PID control is combined with the logic judgment instruction in programmable controller,thus PID control becomes more flexible, and better meets the requirements of productive process.The result of practical operation verifies the feasibility and precision of using PLC in temperature control system of fractionating tower.
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