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

Porzuczek, Jan

doi:10.2478/cpe-2014-0030

Cited by 9 publications

(6 citation statements)

References 56 publications

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“…This problem has resulted in a number of algorithms for image reconstruction, approximating the solution of the inverse problem. Starting from linear methods (e.g., Linear Back-Projection) through nonlinear and iterative methods (e.g., Gauss–Newton) [2,3,5], the approach to the inverse problem has evolved into a dozen modern algorithms that utilize so-called artificial intelligence methods. For instance, in [22], the authors reviewed almost 70 papers describing novel methods for image reconstruction.…”

Section: Methodsmentioning

confidence: 99%

“…The term ‘tomography’ is common for all measurement and visualization methods that provide information about the spatial distribution of certain material properties within an examined object, using measurements performed at the border of the object [2,3]. The graphical representation of those properties’ distributions can be achieved as a result of measurement.…”

Section: Introductionmentioning

confidence: 99%

“…In the literature, one can find a few examples of the use of electrical tomographic methods for monitoring of the drying processes [8,9], but they relate mainly to applications in pharmacy and use capacitance tomography instead of EIT, as proposed in this paper. Application of the Electrical Capacitance Tomography is suitable in the case of highly dielectric materials or processes in which the contact between electrodes and materials is inadvisable (e.g., fluidized bed processes, due to electrode erosion) [3,10]. Impedance tomography seems to be more adequate than ECT for the considered purpose.…”

Section: Introductionmentioning

confidence: 99%

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Assessment of the Spatial Distribution of Moisture Content in Granular Material Using Electrical Impedance Tomography

Porzuczek

2019

Sensors

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This paper presents a method for the online determination of the spatial distribution of the moisture content in granular material. It might be essential for the monitoring and optimal control of, for example, drying processes. The proposed method utilizes Electrical Impedance Tomography (EIT). As an exemplary material for experimental research, the black chokeberry (Aronia melanocarpa) was used. The relationship between the electrical impedance of the chokeberry and its moisture content was determined for a wide range of frequencies (20 Hz–200 kHz). The EIT research consisted of both simulation and experimental investigation. Experimental studies of the spatial distribution of the moisture content were performed in a cylindrical vessel equipped with 8 electrodes circumferentially arranged. The voltage signal from the electrodes was acquired simultaneously using the data acquisition module. Due to the high impedance of the chokeberries, exceeding 109 Ω for the dried matter, extraordinary instrumentation was necessary to be applied. On the other hand, raw chokeberry was characterized by a several orders of magnitude lower impedance (103–104 Ω), especially for high frequencies. The wide range of the observed impedance was able to be measured owing to its use of the voltage stimulation instead of the current stimulation (which is most common for EIT). The image reconstruction problem was solved using an iterative Gauss–Newton algorithm and the EIDORS (Electrical Impedance Tomography and Diffuse Optical Tomography Reconstruction Software) package. The obtained results showed a satisfactory ability to localize an insufficiently dried part of the material. Prospective ways to improve the imaging quality are also discussed.

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Assessment of the Spatial Distribution of Moisture Content in Granular Material Using Electrical Impedance Tomography

Porzuczek

2019

Sensors

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“…The idea is that ECT will use the capacitance differences from all sets of electrodes to reconstruct a 2-D image of solids concentration distribution within the plane. Usually 2 or more electrode arrays are used, and 2D images from each plane are stacked to obtain a 3-D representation of the fluidized bed (Porzuczek, 2014). The quality of the image can be improved by increasing the number of electrodes, and generally, for good quality images, the number of electrodes must exceed 12 (Peng et al, 2012).…”

Section: Electrical Capacitance Tomographymentioning

confidence: 99%

Hydrodynamic analysis of a liquid-solid fluidized bed via CFD-DEM simulations, stability analysis, and tomography

Zbib¹

2023

Preprint

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A coupled computational fluid dynamics (CFD) and discrete element method (DEM) model was developed to analyze the fluid-particle and particle-particle interactions in a 3D liquid-solid fluidized bed (LSFB). The CFD-DEM model was validated using the Electrical Resistance Tomography (ERT) experimental method. ERT was employed to measure the bed-averaged particle volume fraction (BPVF) of 0.002 m glass beads fluidized with water for various particle numbers and flow rates. It was found that simulations employing the combination of the Gidaspow drag model with pressure gradient and virtual mass forces provided the least percentage error between experiments and simulations. It was also found that contact parameters must be calibrated to account for the particles being wet. The difference between simulations and experiments was 4.74%. The CFD-DEM model was also employed alongside stability analysis to investigate the hydrodynamic behavior within the LSFB and the intermediate flow regime for all cases studied.

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“…Electrical capacitance tomography (ECT) is a non-invasive electrical tomography technique that is widely used in industrial application such as fluidised bed (Porzuczek, 2014; Huang et al , 2019; Wang and Yang, 2021) and multiphase flow measurement (Yao and Takei, 2017; Rodriguez-Frias and Yang, 2020; Ye et al , 2020; Shen et al , 2021). The ECT reconstructs images based on the permittivity distribution by mapping the changes in interelectrode capacitance to the sensitivity distribution.…”

Section: Introductionmentioning

confidence: 99%

Dual-plane miniature planar 3D ECT sensor based on 3 × 3 matrix electrode array

Gooi,

Leow,

Pusppanathan

et al. 2023

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Purpose As one of the tomographic imaging techniques, electrical capacitance tomography (ECT) is widely used in many industrial applications. While most ECT sensors have electrodes placed around a cylindrical chamber, the planar ECT sensor has been investigated for depth and defect detection. However, the planar ECT sensor has limited height and depth sensing capability due to its single-sided assessment with the use of only a single-plane design. The purpose of this paper is to investigate a dual-plane miniature planar 3D ECT sensor design using the 3 × 3 matrix electrode array. Design/methodology/approach The sensitivity map of dual-plane miniature planar 3D ECT sensor was analysed using 3D visualisation, the singular value decomposition and the axial resolution analysis. Then, the sensor was fabricated for performance analysis based on 3D imaging experiments. Findings The sensitivity map analysis showed that the dual-plane miniature planar 3D ECT sensor has enhanced the height sensing capability, and it is less ill-posed in 3D image reconstruction. The dual-plane miniature planar 3D ECT sensor showed a 28% improvement in reconstructed 3D image quality as compared to the single-plane sensor set-up. Originality/value The 3 × 3 matrix electrode array has been proposed to use only the necessary electrode pair combinations for image reconstruction. Besides, the increase in number of electrodes from the dual-plane sensor setup improved the height reconstruction of the test sample.

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

Cited by 9 publications

References 56 publications

Assessment of the Spatial Distribution of Moisture Content in Granular Material Using Electrical Impedance Tomography

Assessment of the Spatial Distribution of Moisture Content in Granular Material Using Electrical Impedance Tomography

Hydrodynamic analysis of a liquid-solid fluidized bed via CFD-DEM simulations, stability analysis, and tomography

Dual-plane miniature planar 3D ECT sensor based on 3 × 3 matrix electrode array

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