| Compressor piping vibration reasons:(1) compressor in foundation design problems, power imbalance caused vibration.(2) the airflow pulsation caused by forced vibration.(3) the valve open/close frequencies similar to trigger a piping system of the pipeline resonance of the system.(4) the gas column resonance.Common in engineering is the first (2) (3) the causes of vibration.Plane wave equation was deduced in this paper, the simple lines and complicated pipeline system are analyzed in column and the analysis of pressure fluctuation, the air column length calculation formula of natural frequency and resonance.Based on the compressor piping vibration problem of the actual project cases as the background, through the field test found that the compressor piping vibration exceeds bid badly. IN order to solve the problem of the project, this paper using CAESARII software model for engineering example, calculates the mechanical natural frequency, and each order time frequency vibration mode under the figure. Using BENTLEY PULS pipeline vibration analysis software for the compressor import and export, calculate the compressor pressure pulsation and gaseous natural frequency of pipe system. Thus this paper analyzes the reasons of the vibration of the pipeline, find out main position of the vibration of the pipeline. At the early stage of the software designed on the improvement plan, namely the increase of the key position in the line with support, solve the problem of the mechanical resonance of pipeline; Change the compressor of the import and export pipeline decorate, reduce the compressor import and export of the elbow, into a straight tube, increasing the compressor the buffer tank volume of import and export, can well solve the vibration of the compressor body.And the scheme is applied to actual after the rectification, the compressor piping vibration problem after driving operation in practical engineering vibration has been very good to reduce, through field test found that the vibration of compressor pipes comply with relevant standards.In this paper, design and build the compressor complex pipeline vibration experiment platform, through this platform to complete a series of experimental studies. The buffer tank volume is studied, and the experimental results with the calculated value of PULS software are compared.PULS conclusion verified the correctness of the calculation model and calculation method, for PULS applied to solve practical engineering problems provides experimental support flow pulsation, PULS modeling analysis indicates the software flow pulsation practical engineering problems are effective, and reliable.Studied the orifice aperture ratio, found that the percentage of the pressure drop under the condition of meet the selecting principle of orifice plate, in the orifice diameter than the best choices range from 0.5 to 0.6, when the hole surface air pressure pulsation reduction effect is best. Certain, when the pressure in the pipeline flow must flow changes or when the line pressure changes, it is concluded that with the increase of pressure or flow rate, different aperture ratio of hole surface pressure pulsation of subduction did not show the regularity of the change, and the aperture ratio 0.45,0.5, orifice in most of the reduction percentage of pressure pulsation remain around 70%.Studied the orifice aperture ratio, found that the percentage of the pressure drop under the condition of meet the selecting principle of orifice plate, in the orifice diameter than the best choices range from 0.5 to 0.6, when the hole surface air pressure pulsation reduction effect is best. Certain, when the pressure in the pipeline flow must flow changes or when the line pressure changes, it is concluded that with the increase of pressure or flow rate, different aperture ratio of hole surface pressure pulsation of subduction did not show the regularity of the change, and the aperture ratio 0.45,0.5, orifice in most of the reduction percentage of pressure pulsation remain around 70%.For the thickness of the orifice plate for flow pulsation the reduction law of experiment research, it is concluded that the thickness of different orifice can reduce air pressure fluctuation, but the thickness of 8 mm and 20 mm orifice effect is better. Inside of orifice plate for flow pulsation the reduction law of experiment research, it is recommended to use 20 degrees are inside orifice plate is the best. |
