乙烯增压机管路振动分析及控制

Vibration Analysis and Control for the Pipeline of the Ethylene Booster

针对某石油化工公司化工厂乙烯输送增压机管道系统存在的局部剧烈振动问题,应用CAESARII管道应力分析软件对其管道系统的固有频率及振型进行了详细的分析。采用Fluent流体分析软件对包括缓冲罐在内的增压机入口吸气管段内部乙烯气流的流动情况进行了非稳态分析计算,得到了吸气管路压力脉动响应频率。分析结果表明,管线中乙烯气体压力脉动响应频率与增压机气阀吸、排气频率同步;管道系统的振动是由于管内乙烯气体压力脉动频率接近局部管路的固有频率而引起的局部共振。通过改变振动管系的支架形式使其结构的固有频率发生变化,有效地控制了管系的振动。

For existing local severe vibration problems on the pipeline system of booster pumping ethylene in a petrochemical company, the detailed analysis by CAESARII was carried out to its pipeline system natural frequency and vibration modal, the ethylene flow unsteady state analysis calculations was carried out within the pipeline from the suction tube inlet to suction valve and from the ex- haust valve to the exhaust tube outlet, the law of the ethylene gas pressure pulsation response was obtained on the suction pipe inlet and the exhaust pipe outlet.The analysis results show that ethylene gas pipeline pressure pulsation frequency response was basically equal to the frequency of the suction and exhaust valve open-closed mouth.The vibration of the pipeline system is due to the pressure pulse frequency of the ethylene gas internal pipeline close to the natural frequency of the local pipeline, caused due to local resonance.The natural frequencys of the structure was changed by altering the Hangers of the piping systems,the vibration of the pipeline system was effectively controlled.