CFD simulation of high-temperature effect on EHD characteristics in a wire-plate electrostatic precipitator

Li, Yan; Zheng, Chenghang; Luo, Kun; Gao, Xiang; Fan, Jianren; Cen, Kefa

doi:10.1016/j.cjche.2014.06.038

Cited by 21 publications

(4 citation statements)

References 19 publications

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“…The second region is characterized by a high influence of the drag force, F D . It dominates the electrostatic force, F E , so that the collection efficiency decreases [51,52]. No difference between the two applied field strengths can be identified, as the electrostatic force is not sufficient.…”

Section: Particle Deposition On a Hot Surfacementioning

confidence: 99%

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Design and Characterization of a Melt Electrostatic Precipitator for Advanced Drug Formulations

Justen,

Weltersbach,

Schaldach

et al. 2024

Processes

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Electrostatic precipitators (ESP) are especially known for the efficient separation of micron and submicron particles from aerosols. Wet electrostatic precipitators are particularly suitable for highly resistive materials. Using these, particles can be directly transferred into a liquid for further processing or safer handling, which is advantageous for either hazardous or valuable materials. In this work, a wet ESP, which enables the separation of highly resistive particles into a heated liquid, was designed and investigated. To do this, spray-dried drug particles were embedded in a molten sugar alcohol to enhance the drug dissolution rate. After cooling, the solidified product showed advantageous properties such as a high drug dissolution rate and easy handling for further processing. For the design of the wet ESP, different discharge electrode configurations were tested. A wall film served as the collection electrode, which was generated by a specially designed distributer die. A laminar flow regime was achieved with a homogeneous film serving as the collection electrode, which is particularly important for a high separation efficiency. A prototype was designed and constructed in this respect. The particle separation into hot liquids or onto hot surfaces is challenging due to thermal effects in ESPs. The influence of thermophoresis and drag force on the particle transport was investigated, and optimum operation parameters were found for the present ESP. A broad field of applications can be covered with the presented device, where particles are embedded in even hot liquids to form liquid suspensions or, as it is presented here, solid dispersions. The dissolution of the drug-containing solid dispersion was studied in vitro. A remarkably faster drug dissolution was observed from the solid dispersion, as compared to a powder mixture of the drug and xylitol.

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Section: Particle Deposition On a Hot Surfacementioning

confidence: 99%

“…Secondly, an increase in aerosol temperatures led to an increasing drag force and thereby a decrease in deposition rate. Generally, high temperatures in ESPs are known to reduce collection efficiency due to increased electric wind, elevated drag force, and decreased electrostatic force [52].…”

Section: Particle Deposition On a Hot Surfacementioning

confidence: 99%

Design and Characterization of a Melt Electrostatic Precipitator for Advanced Drug Formulations

Justen,

Weltersbach,

Schaldach

et al. 2024

Processes

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show abstract

“…As expected, the impact of gas velocities on the electric field was negligible due to the mobility of gaseous ions which is hundred times higher than the mobility of the charged particles. In practice, the measured total current, equal to the integral of current density on the collecting plates, is determined by the drift of gaseous ions only, since the mobility of charged particles is much lower [14]. When oil droplets are present, the amount of drift ions to the plates is lower compared with the absence of droplets because of charging particles.…”

Section: A Current and Voltage Characteristicsmentioning

confidence: 99%

“…Kawakami et al [13] studied the performance characteristics between horizontally and vertically oriented electrodes EHD ESP for collection of lowresistive diesel particulates. Li et al [14] simulated the hightemperature effect on EHD characteristics in a wire-plate electrostatic precipitator by the CFD method.…”

Section: Introductionmentioning

confidence: 99%

Experimental Study on EHD Flow Transition in a Small Scale Wire-plate ESP

Wang

Xie

et al. 2016

Measurement Science Review

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The electrohydrodynamic (EHD) flow induced by the corona discharge was experimentally investigated in an electrostatic precipitator (ESP). The ESP was a narrow horizontal Plexiglas box (1300 mm×60 mm×60 mm). The electrode set consisted of a single wire discharge electrode and two collecting aluminum plate electrodes. Particle Image Velocimetry (PIV) method was used to visualize the EHD flow characteristics inside the ESP seeded with fine oil droplets. The influence of applied voltage (from 8 kV to 10 kV) and primary gas flow (0.15 m/s, 0.2 m/s, 0.4 m/s) on the EHD flow transition was elucidated through experimental analysis. The formation and transition of typical EHD flows from onset to the fully developed were described and explained. Experimental results showed that the EHD flow patterns change depends on the gas velocity and applied voltage. EHD flow starts with flow streamlines near collecting plates bending towards the wire electrode, forming two void regions. An oscillating jet forming the downstream appeared and moved towards the wire electrode as voltage increased. For higher velocities (≥0.2 m/s), the EHD transition became near wire phenomenon with a jet-like flow structure near the wire, forming a void region behind the wire and expanding as voltage increased. Fully developed EHD secondary flow in the form of counter-rotating vortices appeared upstream with high applied voltage.

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Operation examples of emission control systems

Okubo¹,

Kuwahara²

2020

New Technologies for Emission Control in Marine Diesel Engines

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CFD simulation of high-temperature effect on EHD characteristics in a wire-plate electrostatic precipitator

Cited by 21 publications

References 19 publications

Design and Characterization of a Melt Electrostatic Precipitator for Advanced Drug Formulations

Design and Characterization of a Melt Electrostatic Precipitator for Advanced Drug Formulations

Experimental Study on EHD Flow Transition in a Small Scale Wire-plate ESP

Operation examples of emission control systems

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