Vibration Analysis of Large Scale Process Reciprocating Compressor System

Abstract

Abstract:

Vibration faults of a large process reciprocating compressor system were analyzed. The unbalanced forces/moments were firstly calculated, and the vibration amplitude of compressor foundation was checked. Finite element models of shafting of compressor-motor and fluid structure interaction of pipeline systems were constructed, respectively. The first six orders vibration mode and frequency of shafting were obtained by the FEM, and the natural frequency of pipeline system was also calculated by FEM. The results show that the vibration amplitude generated by unbalanced moments is acceptable. The main causes of compressor system vibration faults are from fluid structure interaction vibration of pipeline system. Operating speed of compressor has to be changed to avoid the resonance region of shafting vibration. An improvement program of pipeline system was proposed, by which the natural frequency was increased obviously, and the vibration amplitude decreases to 165μm that meets the demands of standard API618 well.

Key words: process reciprocating compressor, vibration, shafting, pipeline, finite element model(FEM)

摘要：

对大型工艺往复式压缩机系统出现振动异常现象的原因进行分析，计算了不平衡力/力矩，在扰力矩计算的基础上对压缩机基础振动状况进行了分析;建立了压缩机-驱动电机轴系模型并进行了有限元模态分析，得到了轴系振动前六阶振型与相应频率;建立了气流脉动与管道系统振动分析的有限元模型，进行了有限元分析计算，得到了管路系统的固有频率和相关研究节点的振幅。分析计算结果表明：由扰力矩引起的机身振动在允许范围内;管路系统的流固耦合振动是导致压缩机系统发生振动故障的主要原因。通过调整压缩机运行转速，改变了激振力频率;提出了管路系统优化方案，优化后的管路系统的固有频率显著提高，能有效避开激振力频率，明显降低管路系统的振幅，其最大振幅降至165μm，满足API618标准要求。

关键词: 工艺往复压缩机, 振动, 轴系, 管路系统, 有限元模型

CLC Number:

TH45

Tang Bin, Liu Guangbin, Xu Haiping, Yang Qichao Wang Le, Zhao Yuanyang, Li Lian. Vibration Analysis of Large Scale Process Reciprocating Compressor System[J]. China Mechanical Engineering, 2014, 25(7): 873-877.

唐斌, 刘广彬, 许海平, 杨启超, 王乐, 赵远扬, 李连生. 大型工艺往复压缩机系统振动分析[J]. 中国机械工程, 2014, 25(7): 873-877.

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