Hydrodynamic study of two phase flow of column flotation using electrical resistance tomography and pressure probe techniques

Vadlakonda, Balraju; Mangadoddy, Narasimha

doi:10.1016/j.seppur.2017.04.029

Cited by 25 publications

(15 citation statements)

References 61 publications

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“…The first Electrical Capacitance Tomography (ECT) systems [120,113,158,79], Electrical Resistance Tomography (ERT) systems [33,32,147,127] as well as the Magnetic Induction (MI) [90,119] allowed to obtain only the rough evaluation of the process state because the information encoded in measurement data represents merely the fragment of the process which additionally was approximated into the cross-section surface through the sensor (2D ECT) [60,163,78,128,135]. This kind of imaging, however still commonly applied in many industrial applications [50,66,67,104,75,65], occurs to be insufficient from the process control point of view.…”

Section: Electrical Tomographymentioning

confidence: 99%

“…The still growing interest strongly depends on their great practical significance in many industrial branches like food, biotechnology, bioprocess, environmental, chemistry and petrol engineering. That is because the TPFs are an important and ubiquitous component of numerous industrial processes like the aeration processes [144,68], chemical reactors [72], processes of flotation [147]. Some examples of TFP applications are summarized in Table 1.…”

Section: Introductionmentioning

confidence: 99%

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Computer methods for non-invasive measurement and control of two-phase flows: a review study

Wajman

2019

ITC

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Nowadays, the application of advanced technologies in modern production systems is the main trend of development and technological progress in many industrial sectors. It is due to the still growing trends of energy-saving and production quality enhancement. Wherever in the production process the phase mixture is transported and it is not optimal or not economic, there is a need to develop a system which would be able to prevent any construction disaster, unexpected production line stopping or situation where for reasons of bad flow parameters, the final product is defective. This paper studies various sensors, measurement techniques and computer methods for signal processing and analysis to diagnose and control two-phase flows. Due to the possibility that the invasive measurement disturbs the process and changes it parameters and behavior especially in the location just after the measurement point and simultaneously does not provide any information about these changes it is unreliable for the diagnosis or control. Therefore, the non-invasive techniques commonly used for measurement of flows parameters are described. Depending on the industrial demands many of applications examples for non-invasive two-phase flows measurement and monitoring are given. This description for identifying the flow parameters is divided into features categories of this phenomena as void fraction distribution, velocity profile and flow regime. However, from these methods the high accuracy and short processing time is expected. The continued observation and monitoring of the process abnormalities can provide valuable information about its dynamic state and allow for real-time and automatic monitoring and control. Therefore, the development of advanced process control is one of the most important challenges to keep the flow regime on the given level and for instant and long-term energy saving, quality improvement.

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Section: Electrical Tomographymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Computer methods for non-invasive measurement and control of two-phase flows: a review study

Wajman

2019

ITC

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“…ERT has been utilized for bubble columns by Vakamalla et al [22] for estimating the bubble dynamics thereby measuring the mixing time successfully. Recently, authors have investigated to characterize the column flotation hydrodynamics using the ERT for both air-water and slurry systems (Vadlakonda and Mangadoddy [23,24]) and validated the measured phase holdup with respect to the other conventional approaches. Slurry system was considered to be consisting of hydrophobic silica particles.…”

Section: Introductionmentioning

confidence: 99%

Measurement of Gas–Solid Dispersion Characteristics in a Slurry Flotation Column Using ERT Technique

Vadlakonda

Mangadoddy

2020

Trans Indian Inst Met

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This work mainly aims on the investigation of phase hold-up characteristics in a column flotation at different feed solid concentrations performing for an extensive range of working conditions. Phase hold-ups are measured using the electrical resistance tomography (ERT) coupled with pressure transducers technique. Experiments are conducted for two different nature mineral particles: hydrophilic (silica) and semi-hydrophobic (oxidized coal). The impact of gas superficial velocity, feed superficial velocity and pulp slurry height for a fixed sparger and frother addition on the gas and solid dispersion are studied. Gas hold-up increases with the gas flowrate and slurry feed rate, decreases with solid concentration. Further, bubble dynamics is estimated using coupled ERT with dynamic gas disengagement (DGD) approach. It is found that the solid's presence affect the bubble swarm velocity thereby causing local gas holdup to drop. Possible mechanisms due to solid particles on gas dispersion are discussed and verified in the light of current experimental results.

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“…Electrical resistance tomography (ERT) [1][2][3][4][5][6][7][8][9][10] is a branch of electrical tomography, alongside with electrical capacitance tomography (ECT) [11][12][13][14][15][16], electrical impedance tomography (EIT) [17][18][19][20][21][22][23][24][25] and electromagnetic tomography (EMT) [26][27][28][29]. Compared with traditional detection methods, this novel real-time detection technique satisfies the high accuracy requirement of modern detection tasks, and enjoys broad application prospects in various fields, namely, twophase/multi-phase flow, geophysical exploration and biomedicine.…”

Section: Introductionmentioning

confidence: 99%

Optimization of Hessian Matrix in Modified Newton-Raphson Algorithm for Electrical Resistance Tomography

Xiao¹

2019

EJEE

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To satisfy the accuracy of image reconstruction, this paper carries out offline optimization of the Hessian matrix in the modified Newton-Raphson algorithm (MNRA) for image reconstruction of electrical resistance tomography (ERT). Firstly, the selection strategy of regularization factor, which directly affects the accuracy of the reconstructed image, was discussed in details. Next, the improved particle swarm optimization (PSO) algorithm was adopted to alleviate the ill-posedness of the Hessian matrix through offline optimization. The variables of offline optimization include the radius ratio between each layer of the finiteelement model (FE model) to the sensitive field (SF) during the γ-refinement of the ERT, and the positions of the nodes added through element subdivision. The experimental results show that, under the same conditions, the above optimization measure can improve the solution accuracy of the ERT's inverse problem by alleviating the ill-posedness of the Hessian matrix, which is used to correct the dielectric resistance distribution (DRD) in the SF, without sacrificing the real-time performance of the MNRA.

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Hydrodynamic study of two phase flow of column flotation using electrical resistance tomography and pressure probe techniques

Cited by 25 publications

References 61 publications

Computer methods for non-invasive measurement and control of two-phase flows: a review study

Computer methods for non-invasive measurement and control of two-phase flows: a review study

Measurement of Gas–Solid Dispersion Characteristics in a Slurry Flotation Column Using ERT Technique

Optimization of Hessian Matrix in Modified Newton-Raphson Algorithm for Electrical Resistance Tomography

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