Measurement technique for the on-line detection of fines in a fluidized bed

McMillan, Jennifer; Dawe, Matthew; Briens, Cédric; Berruti, Franco

doi:10.1016/j.measurement.2011.05.006

Cited by 4 publications

(4 citation statements)

References 9 publications

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“…al. placed 28 parallel insulated copper wires horizontally in a fluidized bed of silica sand particles [77]. A 5 mm long area of each copper wire was stripped from the insulator.…”

Section: Collision Probes; Measurement Of Cumulative Charge Potential or Currentmentioning

confidence: 99%

An overview of advances in understanding electrostatic charge buildup in gas-solid fluidized beds

Mehrani

Murtomaa

Lacks

2017

Journal of Electrostatics

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Electrostatic charging of particles in gas-solid fluidized beds often results in operational complications in commercial processes. This paper provides a comprehensive review of the advances from the last decade in three key areas, namely the fundamental understanding of triboelectric charging, methods to measure particle charge, and experiments to elucidate particle charging processes in fluidized beds. This review underscores the need for better understanding the mechanisms of triboelectric charging in granular systems, effective online charge monitoring techniques, and experiments under industrially relevant conditions to better comprehend the problems in commercial reactors that can enable strategies to mitigate charging.

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“…al. placed 28 parallel insulated copper wires horizontally in a fluidized bed of silica sand particles [77]. A 5 mm long area of each copper wire was stripped from the insulator.…”

Section: Collision Probes; Measurement Of Cumulative Charge Potential or Currentmentioning

confidence: 99%

An overview of advances in understanding electrostatic charge buildup in gas-solid fluidized beds

Mehrani

Murtomaa

Lacks

2017

Journal of Electrostatics

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“…Online methods used in the pharmaceutical industry , would be challenging to adapt to fluid cokers. Simple triboelectric probes may be able to indicate the proportion of fines in the fluidized particles . Sound emissions have been correlated to particle size in polyethylene reactors and granulators, and vibrations are also affected by the particle size …”

Section: Reactormentioning

confidence: 99%

“…Simple triboelectric probes may be able to indicate the proportion of fines in the fluidized particles. 339 Sound emissions have been correlated to particle size in polyethylene reactors 340 and granulators, 341 and vibrations are also affected by the particle size. 342 The bed level measurement is essential in processes such as fluid coking, where particles are circulated between vessels where they are created or consumed.…”

Section: Alternative Feedstocksmentioning

confidence: 99%

Review of Research Related to Fluid Cokers

Briens

McMillan

2021

Energy Fuels

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Fluid coking is a thermal conversion process that uses a conventional two-vessel circulating fluidized bed to convert heavy hydrocarbon feeds to lighter products. The technology was developed in the 1950s and since then has been used commercially around the world to upgrade heavy oils from various sources. Research work has been summarized related to all aspects of the fluid coking process, including reaction fundamentals, bed hydrodynamics, liquid distribution and jet–bed interaction, mixing of solid particles and agglomerates, mixing of vapors, control of the particle size, cleaning of the vapor stream in the scrubber, cleaning of the cold coke in the stripper, process monitoring, coke transfer lines, and the burner. The fluid coking process involves complex interactions between fluidized bed hydrodynamics, liquid feed injection, and reaction kinetics, and research tools that can take into account all of these interacting variables are requited to test methods to optimize the process. Fluid cokers can process many different types of feeds, and future applications may include blending and co-processing a variety of feedstocks ranging from waste plastics, pyrolytic bio-oil, and off-spec vegetable oils with heavy oil. The findings from this summary are also relevant for other applications that inject liquid into fluidized beds, such as the fluid catalytic cracking process, olefin polymerization cooled by liquid injection, granulators, and coaters.

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“…In recent years, the fluidized bed has been widely used in wastewater treatment, petrochemical industry, biochemistry, and other fields because of its good mass and heat transfer properties [1][2][3][4]. In order to design and optimize the fluidized bed, it is important to accurately measure the distribution and flow characteristics of each phase [5][6][7]. In the liquid-solid fluidized bed with uneven fluidization, the shear stress near the riser wall reduces the velocity of the liquid and solid phase, * Authors to whom any correspondence should be addressed.…”

Section: Introductionmentioning

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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Measurement technique for the on-line detection of fines in a fluidized bed

Cited by 4 publications

References 9 publications

An overview of advances in understanding electrostatic charge buildup in gas-solid fluidized beds

An overview of advances in understanding electrostatic charge buildup in gas-solid fluidized beds

Review of Research Related to Fluid Cokers

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

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