Research On Vibration Characteristics And Vibration Control Of High-power Reciprocating Compressor Pipeline

High-power reciprocating compressor is the core equipment of natural gas storage,its reliability and safety will affect the safe production of gas storage.However,due to the working characteristics of the reciprocating compressor,and with the increase of compressor power and higher gas pressure,it is easy to cause severe vibration of the compressor pipeline,which leads to the reduction of compressor production efficiency,fatigue damage to pipeline accessories,and even Causes safety accidents such as pipeline breaks,gas leaks and explosions.Therefore,based on actual engineering problems,this paper studies the vibration characteristics and control of high-power reciprocating compressor pipelines from theoretical analysis,field testing and numerical simulation.The specific research content is as follows:(1)Firstly,the working principle of the reciprocating compressor,the reason for the vibration of the compressor pipeline and the vibration evaluation method are introduced.Secondly,the vibration and pressure pulsation test and analysis were carried out for the pipeline vibration problem of a high-power reciprocating compressor of a gas storage.The results showed that the pressure pulsation in the compressor pipeline meets the standard requirements,while the compressor's first-stage intake buffer tank and overhead pipelines exist Excessive vibration phenomenon.Further analysis results of the vibration signal in the time domain and frequency domain show that the compressor pipeline vibration is mainly caused by the impact of the alternating gas force in the cylinder,and is mainly manifested in the excessive vibration in the H(horizontal)direction.(2)Based on the test and analysis results of the high-power reciprocating compressor of the gas storage,the cause of the vibration of the compressor pipeline of the gas storage is further studied through numerical simulation analysis.Firstly,the modal analysis of the compressor piping system is carried out,and it is concluded that mechanical resonance is the main reason for the excessive vibration of the compressor piping.Secondly,the transfer matrix method based on the plane wave theory and the finite element method are used to calculate the natural frequency of the air column of the pipeline system.The results show that there is no air column resonance in the pipeline system,and the results of the two calculation methods are basically the same.Finally,the fluid-solid coupling vibration analysis of the compressor piping system shows that the fluid-solid coupling effect has little effect on the modal characteristics of the pipe,and the maximum vibration position of the compressor piping in the vibration response analysis is consistent with the test results.(3)Based on the analysis results of the pipeline vibration of the high-power reciprocating compressor of the gas storage,the corresponding vibration control scheme is proposed,and the effectiveness of the scheme is evaluated through numerical simulation.The results show that the modal characteristics of the compressor piping system under this scheme are improved,and the natural frequency resonance zone of the machine and the air column is avoided,and the vibration velocity response value is significantly reduced.According to the vibration control plan,complete the on-site treatment of the gas storage compressor,and evaluate the application effect of the plan through vibration and pressure pulsation test analysis.The results show that the vibration level and pressure pulsation value of the compressor pipeline of the gas storage after the treatment meet the standard requirements,which verifies the effectiveness of the analysis method and the proposed scheme in this paper.