An experimental study on the removal of submicron fly ash and black carbon in a gravitational wet scrubber with electrostatic enhancement

L, Su; Du, Qian; Dai, Xianchao; Gao, Jianmin; Dong, Peng; Wang, Hui

doi:10.1039/c9ra10046f

Cited by 21 publications

(14 citation statements)

References 35 publications

(48 reference statements)

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“…The very same process is also observed in environmental problems, such as accidental oil spills in which oil interacts with sediments to form oil-particle aggregates that may affect the transport of spilled oil and enhance oil biodegradation [4]. In these applications, particle capture occurs in two steps: First, particles move towards the drop/bubble surface under the influence of turbulence in the carrier liquid, possibly aided by external forces as in the case of electrostatic scrubbing [5,6]; then particles stick the drop/bubble surface upon inertial impaction or turbulent diffusion. Particle behaviour upon impaction determines the overall attachment efficiency, which in turn affects the overall capture efficiency of the drop/bubble.…”

Section: Introductionmentioning

confidence: 84%

Particle capture by drops in turbulent flow

Hajisharifi¹,

Marchioli²,

Soldati³

2020

Preprint

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We examine the process of particle capture by large deformable drops in turbulent channel flow. We simulate the solid-liquid-liquid three-phase flow with an Eulerian-Lagrangian method based on Direct Numerical Simulation of turbulence coupled with a Phase Field Model, to capture the interface dynamics, and Lagrangian tracking of small (sub-Kolmogorov) particles. Drops have same density and viscosity of the carrier liquid, and neutrally-buoyant solid particles are one-way coupled with the other phases. Our results show that particles are transported towards the interface by jet-like turbulent motions and, once close enough, are captured by interfacial forces in regions of positive surface velocity divergence. These regions appear to be well correlated with high-enstrophy flow topologies that contribute to enstrophy production via vortex compression or stretching.Examining the turbulent mechanisms that bring particles to the interface, we have been able to derive a simple mechanistic model for particle capture. The model can predict the overall capture efficiency and is based on a single turbulent transport equation in which the only parameter scales with the turbulent kinetic energy of the fluid measured in the vicinity of the drop interface. The model is valid in the limit of non-interacting particles and its predictions agree remarkably well with numerical results.

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Section: Introductionmentioning

confidence: 84%

Particle capture by drops in turbulent flow

Hajisharifi¹,

Marchioli²,

Soldati³

2020

Preprint

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“…Distilled water droplets produced by a specialized contact angle measuring needle of a syringe were then placed onto the tablets. The shape of the droplet on the tablets was captured by a microcamera, and the corresponding hydrophilic angle was analyzed by the tangent method . Each sample was analyzed three times to ensure repeatability.…”

Section: Methodsmentioning

confidence: 99%

Hydrophobic Black Carbon Capture from Ship Emissions Based on a Charger-Coupled Wet Scrubber

Wu,

Zhou,

Zhou

et al. 2023

Energy Fuels

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Black carbon emissions from ships have been identified as a significant contributor to the accelerated melting of Arctic glaciers, and there has been a lack of standardized methods for controlling them. In this study, a comprehensive approach to address ship-based hydrophobic black carbon with simulated nanoparticles (SP-BCs) was developed through enhanced scrubbing by electrostatic charging. The charger-coupled wet scrubber exhibited significant improvement under a low flue gas velocity (1 m/s) and a low liquid-to-gas ratio (L/G ratio, 8 L/m3), where the collection efficiency of the nanoscale SP-BC was increased by over 25%. In addition, many SP-BCs escaped from the outlet of the conventional wet scrubber during a long period of spraying at high intensity. Applying an electrostatic charger, increasing the L/G ratio, and increasing the flow velocity could effectively suppress the escape of black carbon particles during prolonged cyclic spraying. Furthermore, the optimal electric field intensity for the charger was 6.5 kV/cm to ensure a long-term stable operation. The charger-coupled wet scrubber could achieve a minimum emission concentration of SP-BC as low as 4.48 mg/m3, with a corresponding collection efficiency of 91.3%. The results have significant implications for low-resistance and high-efficiency black carbon emission control from ships.

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“…The twin-fluid nozzle, in particular, increases liquid atomization by utilizing an auxiliary gas that aids in liquid atomization. − Twin-fluid nozzles have mostly been employed in industries such as industrial boilers, blast furnaces, and agricultural sprays owing to these advantages . Recent applications include selective catalytic reduction (SCR) injectors, the production of microparticles, and deposition techniques in the fields of biology and pharmaceuticals. − …”

Section: Introductionmentioning

confidence: 99%

Asymmetric Spray Characteristics According to Y-Jet Nozzle Orifice Shape and Spray Conditions

2023

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The Y-jet nozzle is a twin-fluid nozzle that has a larger operating range and simpler structure than other twin-fluid nozzles. Furthermore, it offers outstanding atomization quality even at low flow rates, mak ing it simple to atomize viscous liquids. However, because of the structure of the Y-jet nozzle, having an asymmetrical spray pattern is limited. Most existing experimental studies focused on the orifice diameter and mixing tube length. In this study, two types of elliptical nozzles and one type of circular nozzle were tested. We found that the elliptical nozzle’s asymmetric spray characteristics are different from those of the circular type. Furthermore, it was demonstrated that the spray characteristics were different even in ellipsoids, with only the major and minor axes differing.

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An experimental study on the removal of submicron fly ash and black carbon in a gravitational wet scrubber with electrostatic enhancement

Abstract: The efficiency increases of black carbon and fly ash upon the addition of an electric field to a wet scrubber were expatiated.

Cited by 21 publications

References 35 publications

Particle capture by drops in turbulent flow

Particle capture by drops in turbulent flow

Hydrophobic Black Carbon Capture from Ship Emissions Based on a Charger-Coupled Wet Scrubber

Asymmetric Spray Characteristics According to Y-Jet Nozzle Orifice Shape and Spray Conditions

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