This paper investigates a case study of the use of a passive acoustic sensor for online measurement of the dilute phase gas-solid pipeline flows.The acoustic emission Replacement Foil sensor is mounted externally on a stainless steel line conveying silica powders.For different experimental conditions, including the solid to air mass ratios from 0.6 to 1.
4 and the gas volume flows from 160 to 240 m3/h, the sound signals in the pipeline are discussed using the wavelet transform technique.The measured values of transmission mechanism of two different lengths, 25 mm and 35 mm, are analyzed.The results show that Sale the variation tendency of standard deviations is consistent and that the noninvasive, online acoustic detect technique can be regarded as a satisfactory tool in gas-solid flows.