Analysis And Control Of Pipeline Vibration Of Reciprocating Copmpressor

The pipeline vibration and pulsation were studied in this paper through the method of theoretical calculation and experimental test.In the aspect of pipeline structure vibration,according to an engineering example,the pipeline inherent frequency and harmonious response were analyzed using the software CAESAR Ⅱ,at the same time,the excitation frequency and the maximal displacement were calculated in this paper under the condition of vibration of various operating conditions.In order to reduce pipeline vibration,the author have put forward some methods according to the calculation results,for example,adjusting the pipeline arrangement or change the pipe clamp type,location,etc.The largest pipeline vibration intensity decrease from26mm to4mm through improvement,and the effect of reduce vibration is obvious.Also found that, that avoid the resonance can effectively reduce the pipeline vibration;Pipeline stiffness influence pipeline natural frequency.In the aspect of internal gas medium,the pulstion was solved based on the plane wave theory using software PULS,to calculate the specific size and distribution of the pressure pulsation in pipe,and the calculation results was verified through the experiment.By the calculation and improvement,pulse pressure value drop from29.2KPa to14.0KPa,pipe horizontal vibration force drop from2145N to1598N.Experiments show that,simulation results basically agreed with the actual measurement results;The theoretical value slightly higher the experiment test values.The pressure pulsation was studied by pressure pulsation acquisition system that consist with high speed data acquisition instrument and multifunctional configuration software DASYLab.Experiments show that,the Buffer can significantly reduce the pressure pulsation in the piping,the experimental Buffer ripple reduction rate in the range of50%-80%;The Heat Exchanger can also significantly reduce the flow pulsation in tube,but the higher pressure loss was produced,ripple reduction rate was72.4%and the loss of pressure is29.29KPa in this experiment;The Orifice can significantly reduce the pressure pulsation in pipe,the measured ripple reduction rate within the range of9.8%-93.6%.when the aperture ratio equal to0.5,the decrement ability is biggest for that Orifice that with the same thickness and different aperture ratio,Especially to flow pulsation on the orifice side.For Orifice,the variation that the thickness within the scope of4mm-36mm and the angle in the range of5°～45°have no difference to the decrement ability.For the positive angle orifice,ordinary orifice,negative angle orifice,the filter effect is abated in turn,but the pressure loss is gradually increased.The main conclusions in this paper.pipeline structure changes can change pipeline stiffness, so as to change the pipeline natural frequency, and then change the state of the vibration of the pipeline;Reasonable choice of Buffer volume can effectively control flow pulsation;Heat Exchanger that was installed at Compressor exit can greatly reduce the flow pulsation,but will produce larger pressure loss;Orifice can significantly reduce the flow pulsation, but at the same time generate large pressure loss,and cutting efficiency and pressure loss are positively related.