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The screened waveguide for intrusive acoustic emission detection and its application in circulating fluidized bed
Author(s) -
Sheng Tao,
Zhang Peng,
Huang Zhengliang,
Yang Yao,
Sun Jingyuan,
Jiang Binbo,
Ding Xingcheng,
Wang Jingdai,
Yang Yongrong,
Liao Zuwei
Publication year - 2021
Publication title -
aiche journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.958
H-Index - 167
eISSN - 1547-5905
pISSN - 0001-1541
DOI - 10.1002/aic.17118
Subject(s) - annulus (botany) , waveguide , noise (video) , materials science , particle (ecology) , flux (metallurgy) , natural rubber , acoustics , flow (mathematics) , mechanics , energy flux , fluidized bed combustion , physics , fluidized bed , composite material , geology , thermodynamics , optoelectronics , oceanography , image (mathematics) , astronomy , artificial intelligence , computer science , metallurgy
A screened waveguide with a 90° elbow, which had a rubber surface to reduce noise generations and a steel/air interface to block noise propagations, was designed to measure local particle movements in certain directions. In the riser of circulating fluidized bed, the noise energy only accounted for 2.1% of the total energy received by the waveguide. Besides, the radial acoustic emission energy distribution detected via the waveguide was highly consistent with the radial solid flux distribution measured by the extraction probe. Furthermore, the radial flow patterns in the riser with Geldart D particles were measured under dense phase conveying by this new method, which always demonstrated as core‐annulus flows and the transition points ( r / R ) increased with decreasing solid–gas ratios.