关键词: 离心压缩机, 管道振动, 模态分析, 离散元仿真, 颗粒阻尼器, 流体脉动, 颗粒碰撞,

Abstract:

The outlet pipeline of a centrifugal compressor in a certain enterprise vibrates violently, and on site vibration measurement finds that the maximum vibration acceleration of the pipeline is as high as 185.84 m/s². The particle collision damping technology is used to reduce vibration in the outlet pipeline. An analysis of the causes of pipeline vibration is conducted using ANSYS finite element analysis software. It is found that the second-order modal frequency of 13.195 Hz is almost consistent with the measured excitation frequency of 13 Hz. It is concluded that the reason for the severe vibration of the pipeline is due to the resonance caused by the similarity between the natural frequency of the pipeline machinery and the excitation frequency. Using the discrete element analysis software EDEM to explore the optimal vibration reduction scheme of particle dampers, it is found that when the filling rate is 50%, the structural energy consumption rate is the highest and the vibration reduction effect is the best. On site installation, a vibration reduction scheme with a particle size of 20 mm and a filling rate of 50% is selected, and then the vibration acceleration decreased from 185.84 m/s² to 50.549 m/s², with a maximum reduction of 72.80%, the average reduction in other positions is over 65%. The pipeline vibration is significantly suppressed, the safety of the compressor outlet pipeline is ensured.

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