Estimation of Solid Fraction Based on Equivalent Magnetic Circuit in TMR-Based Electromagnetic Tomography

Liang, Xiao; Wang, Chao; Ye, Jiamin; Wang, Ruichang; Luan, Xinyu

doi:10.1109/tim.2022.3196429

Cited by 5 publications

(2 citation statements)

References 29 publications

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“…According to the equivalent magnetic circuit, the equivalent permeability can be estimated using the boundary measurement data as [20]…”

Section: Establishment Of the Compensation Modelmentioning

confidence: 99%

An approach to solving the effect of background in fluidized bed on electromagnetic tomography

Luan,

Wang,

Liang

2024

Meas. Sci. Technol.

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As a non-invasive measurement technique, electromagnetic tomography (EMT) system based on tunneling magneto resistance (TMR) can detect the distribution of medium in the gas-liquid-solid fluidized bed by the difference of permeability. The distribution of medium in the three-phase fluidized bed is not uniform, and the solid clusters and bubble clusters are formed in the background of the gas-liquid-solid mixture. Since the effect of the background in the pipe of the fluidized bed on the boundary measurement data of the TMR-EMT system is much greater, it is difficult to detect solid clusters and bubble clusters when the image is reconstructed directly using the boundary measurement data. In order to improve the detection of clusters by the TMR-EMT system, a method to weaken the effect of the background is proposed. The equivalent magnetic circuit model is used to estimate the background permeability. Then the magnetic dipole theory and demagnetization effect theory are utilized to establish a simple background compensation model based on the estimated background permeability. Using the compensation model, the effect of the background is weakened from the boundary measurement data and the cluster distribution information is highlighted. Simulation and experimental results demonstrate the effectiveness of the proposed method.

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“…According to the equivalent magnetic circuit, the equivalent permeability can be estimated using the boundary measurement data as [20]…”

Section: Establishment Of the Compensation Modelmentioning

confidence: 99%

An approach to solving the effect of background in fluidized bed on electromagnetic tomography

Luan,

Wang,

Liang

2024

Meas. Sci. Technol.

Self Cite

View full text Add to dashboard Cite

show abstract

“…Ferromagnetic substances affect the distribution of the magnetic field, so the equivalent magnetic circuit is used to analyze the field distribution [29]. In the equivalent magnetic circuit of the TMR-EMT, as shown in figure 2, each path passes through the TMR detection point.…”

Section: Equivalent Thickness Estimation Of the High Solids Holdup Ringmentioning

confidence: 99%

Removal of the effect of the high solids holdup ring in the fluidized bed on electromagnetic tomography

Wang

Luan

Liang

et al. 2023

Meas. Sci. Technol.

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Electromagnetic tomography (EMT) system based on tunneling magneto resistance (TMR) sensor, as a non-invasive multiphase flow measurement technique, can effectively detect the solid-phase distribution in the gas-liquid-solid three-phase fluidized bed with magnetic catalysts by reconstructing the permeability distribution image. The radial distribution of solid particles in the gas-liquid-solid three-phase fluidized bed with uneven fluidization is non-uniform, in which a high solids holdup ring exists near the wall of the riser. When the TMR-EMT system is used directly for image reconstruction, the high solids holdup ring will greatly reduce the image quality, further leading to the inability to detect phase information in the riser. To improve the reconstructed image by the TMR-EMT system, a removal method for the high solids holdup ring is proposed. The method firstly estimates the equivalent thickness of the high solids holdup ring based on the boundary measurement data. Then the influence of the high solids holdup ring on the boundary measurement data is subtracted. By the removal method, the internal phase distribution information is prominent. The simulation and experimental results demonstrate that the proposed method can realize the permeability distribution detection by the TMR-EMT system in the presence of the high solids holdup ring.

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Developments and applications of electromagnetic tomography in process engineering

Sharifi,

Fourie,

Heffernan

et al. 2024

Chemical Engineering Research and Design

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Estimation of Solid Fraction Based on Equivalent Magnetic Circuit in TMR-Based Electromagnetic Tomography

Cited by 5 publications

References 29 publications

An approach to solving the effect of background in fluidized bed on electromagnetic tomography

An approach to solving the effect of background in fluidized bed on electromagnetic tomography

Removal of the effect of the high solids holdup ring in the fluidized bed on electromagnetic tomography

Developments and applications of electromagnetic tomography in process engineering

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