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

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

doi:10.1088/1361-6501/acbdb6

Cited by 3 publications

(2 citation statements)

References 30 publications

(32 reference statements)

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“…In order to achieve accurate cluster reconstruction, it is necessary to design a compensation method to weaken the effect of background on boundary measurement data. Previously, Wang et al [17] proposed a compensation method for the boundary measurement data, but the compensation model needs to be measured by simulation and experiment in advance, which increases the complexity of the compensation process and the accuracy of the measurement affects the compensation results.…”

Section: Introductionmentioning

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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Section: Introductionmentioning

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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“…It has been applied in industry (e.g. the monitoring of the melting process [1,2], the testing of metal/non-metal components [3][4][5], and the visualization of the multiphase flow processes in fluidized beds [6][7][8][9]) and in biomedicine [10][11][12][13].…”

Section: Introductionmentioning

confidence: 99%

Design of soft-magnetic shield in electromagnetic tomography

Liang,

Wang,

et al. 2023

Meas. Sci. Technol.

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In the electromagnetic tomography (EMT) system, the soft-magnetic shield is employed to avoid the external interference at low frequency. However, the influence of the soft-magnetic shield on the measurement lacks theoretical exploration, and the design of the soft-magnetic shield is arbitrary. To solve this problem, the effect of different thicknesses and locations of the soft-magnetic shield on the measurement is compared by numerical simulation. It is observed that the soft-magnetic shield not only enhances the boundary measurement data and sensitivity but also improves the quality and stability of the reconstructed images. The smaller the distance between the soft-magnetic shield and the pipe, or the bigger the thickness of the soft-magnetic shield, the better the improvement. The physical mechanism of the above results is explicated by the equivalent magnetic circuit analysis method. Based on the above investigation, the optimal structure of the soft-magnetic shield is designed, and it is verified by experiments.by experiments.

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Application of tunneling magnetoresistance in electromagnetic tomography system construction

Wang,

Ye,

Liang

et al. 2024

Review of Scientific Instruments

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Tunneling magnetoresistance (TMR) is a magnetic sensor that measures the magnetic induction component toward a sensitive axis. It is used in electromagnetic tomography (EMT) systems for its high sensitivity, frequency independence, and small size. TMR-based EMT (TMR-EMT) system construction and performance enhancement require a more comprehensive understanding of TMR characteristics. This paper introduces the construction principle of a TMR-EMT system, studies effect of TMR quantity on imaging results, compares the difference between TMR-EMT and coil-based EMT (Coil-EMT) in imaging results, analyzes the influence of TMR characteristics on the measurements, and gives the corresponding solutions. Simulations and experiments indicate that adding more TMRs could enhance imaging quality, obtaining better results than Coil-EMT imaging quality. The experimental results show that dynamically adjusting the excitation amplitude and downward zero-crossing switching can effectively improve the problems of output saturation and deteriorating consistency of measurements caused by TMR nonlinear characteristic.

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

Cited by 3 publications

References 30 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

Design of soft-magnetic shield in electromagnetic tomography

Application of tunneling magnetoresistance in electromagnetic tomography system construction

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