Applications of Electrical Capacitance Tomography for Research on Phenomena Occurring in the Fluidised Bed Reactors

2014 ◽  
Vol 35 (4) ◽  
pp. 397-408 ◽  
Author(s):  
Jan Porzuczek
Keyword(s):  
Temperature Distribution ◽  
Chemical Engineering ◽  
Electrical Capacitance Tomography ◽  
Fluidised Bed ◽  
Electrical Capacitance ◽  
Process Tomography ◽  
New Research ◽  
Capacitance Tomography ◽  
Data Acquiring ◽  
Metrological Requirements

Abstract The paper presents a review of current achievements in the Electrical Capacitance Tomography (ECT) in relation to its possible applications in the study of phenomena occurring in fluidised bed reactors. Reactors of that kind are being increasingly used in chemical engineering, energetics (fluidised bed boilers) or industrial dryers. However, not all phenomena in the fluidised bed have been thoroughly understood. This results in the need to explore and develop new research methods. Various aspects of ECT operation and data processing are described with their applicability in scientific research. The idea for investigation of temperature distribution in the fluidised bed, using multimodal tomography, is also introduced. Metrological requirements of process tomography such as sensitivity, resolution, and speed of data acquiring are noted.

Electrical Capacitance Tomography Based Sorting Technique for Wasted Plastics

2015 ◽  
Author(s):  
Yusuke Hirose ◽  
Kazuaki Hata ◽  
Sapkota Achyut ◽  
Masahiro Takei
Keyword(s):  
Temperature Distribution ◽  
Relative Permittivity ◽  
Electrical Capacitance Tomography ◽  
Electrical Capacitance ◽  
Time Step ◽  
Cross Sectional ◽  
Sorting Technique ◽  
The Many ◽  
Capacitance Tomography ◽  
Temperature Equation

This study has launched a concept to measure real time two-dimensional temperature distribution non-invasively by a combination of electrical capacitance tomography (ECT) technique and a permittivity-temperature equation for plastic pellets. The concept has two steps which are the relative permittivity calculation from the measured capacitance among the many electrodes by ECT technique, and the temperature distribution calculation from the relative permittivity distribution by permittivity-temperature equation. ECT sensor with 12-electrode is designed to measure and visualize the cross sectional temperature distribution during polymethyl methacrylate (PMMA) pellets cooling process. The images of the normalized relative permittivity distribution are successfully reconstructed at every time step during the process. The images indicate that the normalized relative permittivity of PMMA pellets is decreased as the temperature is decreased.

scholarly journals Multiphase permittivity imaging using absolute value electrical capacitance tomography data and a level set algorithm

2016 ◽  
Vol 374 (2070) ◽  
pp. 20150332 ◽  
Author(s):  
E. Al Hosani ◽  
M. Soleimani
Keyword(s):  
Level Set ◽  
Measurement Data ◽  
Industrial Process ◽  
Experimental Results ◽  
Electrical Capacitance Tomography ◽  
Electrical Capacitance ◽  
Absolute Value ◽  
Reconstruction Methods ◽  
Process Tomography ◽  
Capacitance Tomography

Multiphase flow imaging is a very challenging and critical topic in industrial process tomography. In this article, simulation and experimental results of reconstructing the permittivity profile of multiphase material from data collected in electrical capacitance tomography (ECT) are presented. A multiphase narrowband level set algorithm is developed to reconstruct the interfaces between three- or four-phase permittivity values. The level set algorithm is capable of imaging multiphase permittivity by using one set of ECT measurement data, so-called absolute value ECT reconstruction, and this is tested with high-contrast and low-contrast multiphase data. Simulation and experimental results showed the superiority of this algorithm over classical pixel-based image reconstruction methods. The multiphase level set algorithm and absolute ECT reconstruction are presented for the first time, to the best of our knowledge, in this paper and critically evaluated. This article is part of the themed issue ‘Supersensing through industrial process tomography’.

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