基于临界比例度法的罗茨风机PID整定

PID tuning of Roots blower based on critical proportioning method

某化工项目中热解炉在正常运行过程中负压需保持稳定。在此采用临界比例度法在PLC调节器中直接进行罗茨风机PID参数的初步整定、计算出整定参数,然后根据实际调节情况进行参数的进一步调整,确定最终的整定值。热解炉进料和喷嘴清洗的实际工况运行,证明了调节器的调节性能好,热解炉的负压稳定性好,满足了工艺要求。该整定方法具有快速性、直观性和适应强的特点。该文对于工艺设备可进行多次试验和允许临界振荡工况的系统具有良好的工程实践和借鉴意义。

The negative pressure in normal running process of the reactor in the chemical project should keep stable. The critical proportioning method is adopted to directly adjust the PID parameters of the Roots blower in preliminarily, and then cal- culate the adjusting parameters. After that the parameters are further adjusted according to the practical adjusting condition to de- termine the final tuning values. The practical running conditions of feedstock and nozzles cleaning of the reactor prove that the regulator has perfect regulating performance, the negative pressure of the reactor has good stability, which can satisfy the process requirement. This parameter tuning method has the characteristics of fast setting speed, good intuition, and strong adaptabili- ty. The method has better engineering practice and reference value for that the process equipment can conduct several tests and the svstern onerates at critical oscillation condition.