Study And Application Of Micro-perforation Compound Muffler

Booster compressor is a widely power machinery equipment in oxygen production industry and plays an important role in iron and steel smelting.However,due to the characteristics of high noise level,many noise sources and wide influence area produced during its operation,the booster compressor has become the main noise source in the oxygen production plant,and it is urgent to control the noise of the supercharger.In this thesis,based on the noise test of booster compressor unit,the characteristics of the main noise sources are analyzed,and a new type of compound noise elimination device with micro-perforated plate is designed by combining the noise elimination technology and the theory of micro-perforated sound absorption.Secondly,the acoustic model of the compound muffler is constructed by the sound transfer matrix method,and the acoustic performance of the compound muffler is explored in detail.And then,the muffler performance of the compound muffler is tested and verified by the experimental method.Finally,the compound muffler is successfully applied to the sound insulation cover of the compressor.Specific research contents are as follows:1.On the basis of the detailed understanding of the working principle of the booster compressor,the near-field sound pressure measurement method and the sound array sound source positioning method are adopted to conduct a comprehensive noise testing and noise source identification for the booster unit,and the noise abatement required by the noise elimination device in each frequency band is determined based on the noise characteristics of the main noise source.2.Based on the resistive anechoic unit and the double-layer micro-perforated plate anechoic unit,the acoustic model of the micro-perforated plate compound anechoic device was constructed by the sound transfer matrix method.Then,the accuracy of the transfer loss model of the compound anechoic device was verified by finite element numerical calculation,and the key structural parameters such as micropore diameter,plate thickness,cavity depth and perforation rate were determined.3.According to the structural parameters,a compound micro-perforated plate muffler was developed,and the transmission loss of the muffler was measured by impedance tube.The compound muffler is installed on the hole of the sound insulation cover,and the insertion loss of the integrated sound insulation cover is calculated.The insertion loss reaches 33.2d B(A),which is more than the previous design value25.8d B(A).It is proved that the noise suppression device designed in this thesis can be used to control the noise of the booster compressor in the main workshop of Laiwu Steel Group Oxygen Plant.