化工学报Issue(2)：476-484,9.DOI:10.11949/j.issn.0438-1157.20150567
填料塔液泛的声发射测量
Measurement of flooding gas velocity in packed column by acoustic emission technique
摘要
Abstract
The acoustic emission (AE) signal characteristics under different operation conditions of packed column were investigated by analyzing standard deviation (STD), power spectrum density (PSD) and multi-scale wavelet transform of acoustic emission signals. Criterions to determine the flooding gas velocity were proposed. The influence of liquid flowrate was investigated by air-water experiments. It was found that the prediction of the flooding gas velocity by AE signal STD was close to that by pressure drop. The power spectrum density of acoustic emission signals under different operation conditions showed that the maximal PSD peak transferred from around 50 kHz and 60 kHz to around 25 kHz when the packed column flooding. 7 scales wavelet transform was used to investigate the acoustic emission signals. Energy fraction of G1 (d4,d5) scale had a sharp rise as the gas velocity came to flooding gas velocity. The prediction of flooding gas velocity by G1 scale energy fraction was close to that by pressure drop. As a non-invasive method, acoustic emission detection can monitor flooding accurately and have a good application prospect.关键词
声发射/塔器/填充床/流动/液泛/标准差/功率谱/小波分析Key words
acoustic emission/column/packed bed/flow/flooding/standard deviation/power spectrum/wavelet analysis分类
化学化工引用本文复制引用
范小强,何乐路,黄正梁,叶向群,李勇,王靖岱,阳永荣..填料塔液泛的声发射测量[J].化工学报,2016,(2):476-484,9.基金项目
国家自然科学基金项目（21406194）；博士后基金项目（528000-X91401）；高等学校博士学科点专项科研基金项目（20130101110063）；浙江省杰出青年科学基金项目（R14B060003）。@@@@supported by the National Natural Science Foundation of China (21406194), the China Postdoctoral Science Foundation (528000-X91401), the Specialized Research Fund for the Doctoral Program of Higher Education of China (20130101110063) and the Zhejiang Provincial Natural Science Foundation of China (R14B060003) （21406194）
