Investigation of gas-solids flow characteristics in a conical fluidized bed dryer by pressure fluctuation and electrical capacitance tomography

被引：15

作者：

Ge, Ruihuan ^{[1
,2
]}

Ye, Jiamin ^{[2
]}

Wang, Haigang ^{[2
]}

Yang, Wuqiang ^{[3
]}

机构：

[1] Monash Univ, Dept Chem Engn, Clayton, Vic, Australia

[2] Chinese Acad Sci, Inst Engn Thermophys, Beijing 100190, Peoples R China

[3] Univ Manchester, Sch Elect & Elect Engn, Manchester, Lancs, England

来源：

DRYING TECHNOLOGY | 2016年 / 34卷 / 11期

基金：

中国国家自然科学基金;

关键词：

Electrical capacitance tomography; fluidized bed drying; hydrodynamics; pressure fluctuation; MULTIRESOLUTION ANALYSIS; HYDRODYNAMIC BEHAVIOR; MONITOR;

D O I：

10.1080/07373937.2015.1116083

中图分类号：

TQ [化学工业];

学科分类号：

0817 ;

摘要：

It is important to investigate the gas-solids flow characteristics of fluidized bed drying processes to improve the operation efficiency and guarantee the product quality. This paper presents research into fluidized bed drying processes measured by high-frequency differential pressure fluctuation and electrical capacitance tomography (ECT). Power spectra analysis is combined with dynamic calibration for ECT to reveal the complex gas-solids flow behavior. Bubble characteristics are visualized by cross-sectional and quasi-3D ECT images. In addition, results by discrete wavelet transform analysis are given and compared with the analysis results of previous sections. It has been found that bubbles would coalesce in different ways under different operation conditions, and discrete wavelet transform sub-signals of ECT measurements are sensitive to particle moisture. This work reveals the complex hydrodynamic behavior in the fluidized bed dryer and provides valuable information for process control.

引用

页码：1359 / 1372

页数：14

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