Application of electrical capacitance tomography in circulating fluidised beds – A review

Wang, Haigang; Yang, Wuqiang

doi:10.1016/j.applthermaleng.2020.115311

Cited by 71 publications

(25 citation statements)

References 106 publications

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“…Consequently, the electrostatic sensor cannot quantify the pulverized coal concentration in these gas-solid flow systems. Capacitance sensing technique utilizes the difference between gas and solid dielectric constants to measure the solid particle concentration (dos Reis and da Silva, 2014; Wang and Yang, 2020). With necessary measures taken to illuminate the influence of the particle electrification on the capacitance signal, the accurate and reliable measurement of particle concentration can be achieved by capacitance sensing technique (Li et al, 2015a).…”

Section: Introductionmentioning

confidence: 99%

Development of ring-shaped electrostatic coupled capacitance sensor for the parameter measurement of gas-solid flow

Ding

Wang

et al. 2021

Transactions of the Institute of Measurement and Control

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This paper develops a novel non-intrusive ring-shaped electrostatic coupled capacitance sensor (ECCS) for the parameter measurement of gas-solid flow to eliminate the temperature drift of traditional capacitance sensor and to improve the reliability of velocity measurement. In ECCS, one source electrode and two detection electrodes are housed in a sensing head to simultaneously derive two pairs of capacitance and electrostatic signals, which can achieve the simultaneous measurement of the particle velocity, concentration and mass flow rate within the same sensing space of gas-solid flow system. The effects of the isolation electrodes on the capacitance sensitivity and the temperature drift of the sensor standing capacitance are further investigated. Then, a weighted velocity is determined by fusing the capacitance correlation velocity and the electrostatic correlation velocity based on the correlation coefficients, which are useful for the reliable measurement of gas-solid flow. Finally, experiments are carried out to test the performance of the developed ring-shaped ECCS. Results demonstrate that the developed ECCS triples the capacitance sensitivity for the radial position from -15 mm ∼15 mm. The temperature drift of the capacitance signal is less than 0.075 mV/oC from the room temperature to 65 oC, and thus the sensor standing capacitance is almost impervious to the temperature. After calibrating the relationship between the particle concentration and the capacitance signal, the developed ECCS can measure the particle mass flow rate with a relative error less than ±8%.

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Section: Introductionmentioning

confidence: 99%

Development of ring-shaped electrostatic coupled capacitance sensor for the parameter measurement of gas-solid flow

Ding

Wang

et al. 2021

Transactions of the Institute of Measurement and Control

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“…This includes the development of rotatable or 3D sensors [ 18 , 19 , 20 ]. Comprehensive reviews for ECT sensors in circulating fluidized beds can be found in [ 21 , 22 ], and reviews for ERT sensors in chemical engineering can be found in [ 23 ].…”

Section: Electrical Resistance and Electrical Capacitance Tomographymentioning

confidence: 99%

A Review on Fast Tomographic Imaging Techniques and Their Potential Application in Industrial Process Control

Hampel

Babout

Banasiak

et al. 2022

Sensors

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With the ongoing digitalization of industry, imaging sensors are becoming increasingly important for industrial process control. In addition to direct imaging techniques such as those provided by video or infrared cameras, tomographic sensors are of interest in the process industry where harsh process conditions and opaque fluids require non-intrusive and non-optical sensing techniques. Because most tomographic sensors rely on complex and often time-multiplexed excitation and measurement schemes and require computationally intensive image reconstruction, their application in the control of highly dynamic processes is often hindered. This article provides an overview of the current state of the art in fast process tomography and its potential for use in industry.

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“…ECVT has been applied in the investigation of fluidized beds [3]- [6], trickle beds [7], slurry bubble columns [8], phase separators [9] and various other industrial processes that are extensively used in petroleum, pharmaceutical, metallurgical, energy and water treatment industries. It should be noted that ECVT finds its origin in electrical capacitance tomography (ECT), a two-dimensional imaging modality based on capacitance sensors [10]- [12]. As such, many algorithms developed for ECT can be directly translated to ECVT, e.g.…”

Section: Introductionmentioning

confidence: 99%

Robust Automated Stopping Criterion for Semi-Convergent Image and Velocity Reconstruction in Electrical Capacitance Volume Tomography

Chowdhury

Park

Pottimurthy

et al. 2022

IEEE Open J. Instrum. Meas.

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Electrical Capacitance Volume Tomography (ECVT) is a low-cost and high-speed sensing modality with great potential for industrial multiphase flow monitoring. In this work, we examine the use of the slope of the capacitance vector residual curve, as directly provided by the measurement data, to formulate a robust stopping criterion for the iterative image reconstruction in ECVT. The methodology is illustrated based on experimental data from a gas-solid fluidized bed. We show that the proposed stopping criterion can improve the performance of both the image reconstruction and the flow velocity profiling in ECVT applications.For concreteness, we focus on the popular Landweber iterative reconstruction algorithm although other reconstruction algorithms exhibiting semi-convergent behavior might benefit from the present analysis as well.

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Application of electrical capacitance tomography in circulating fluidised beds – A review

Cited by 71 publications

References 106 publications

Development of ring-shaped electrostatic coupled capacitance sensor for the parameter measurement of gas-solid flow

Development of ring-shaped electrostatic coupled capacitance sensor for the parameter measurement of gas-solid flow

A Review on Fast Tomographic Imaging Techniques and Their Potential Application in Industrial Process Control

Robust Automated Stopping Criterion for Semi-Convergent Image and Velocity Reconstruction in Electrical Capacitance Volume Tomography

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