Systematic Approach to Optimization of Submicron Particle Agglomeration Using Ionic-Wind-Assisted Pre-Charger

Chang, Qianyun; Zheng, Chenghang; Gao, Xiang; Chiang, Pen‐Chi; Luo, Zhenyue; Cen, Kefa

doi:10.4209/aaqr.2015.06.0418

Cited by 22 publications

(9 citation statements)

References 26 publications

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“…When the applied voltage increased from 0 kV to 8 kV, although the initial particle concentration was lowered, the collision frequency between CFPs increased due to charging, which enhanced the agglomeration of CFPs. 50 Therefore, the concentration no longer showed a linearly declining form but first rapidly decreased due to charging, which enhanced the agglomeration that gradually approached a linear decline due to the limited charge. Moreover, discharge can enhance vapor condensation based on the combination of three phenomena: (1) dielectrophoresis or dielectrophoretic nucleation of the vapor on electrically charged centers; (2) electrohydrodynamic flow of the vapor due to the drag force caused by electrically charged particles; and (3) temporal (until droplets are discharged) storage of heat energy in electrically charged droplets.…”

Section: Resultsmentioning

confidence: 99%

Evolution of Condensable Fine Particle Size Distribution in Simulated Flue Gas by External Regulation for Growth Enhancement

Zheng

Shen

et al. 2020

Environ. Sci. Technol.

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Condensation fine particles (CFPs) from coal-fired flue gas harm humans and the environment after being emitted into the atmosphere. Given their small size (<0.1 μm), difficulty arises in efficiently removing CFPs by wet electrostatic precipitators and mist eliminators. In this work, a laboratory apparatus was used to study the CFP growth under simulated power plant conditions. Four methods were independently investigated to increase the particle size: addition of ammonia, addition of fly ash, decreasing temperature, and applying an electrical discharge. Results demonstrated that the CFP size distribution possessed a unimodal structure with peak at 0.05 μm. At increased ammonia concentration from 10 to 30 ppm, the peak of growth factor shifted rightward and increased from 1.21 to 1.35 and the range of growth factor >1 was significantly broadened due to joint action of multiple mechanisms. Fly ash acted as the core, and CFPs adhered to the ash surface when forming ash−salt droplets. Cooling flue gas could also enhance the CFP growth due to vapor condensation. At decreased temperature from 45 to 30 °C, the median diameter of CFPs increased by 15%. Finally, the growth and agglomeration of CFPs can be further enhanced when an external electrical field was utilized. The size range of growth factor >1 can be broadened, and the peak growth factor significantly increased at 8 kV applied voltage. The research findings provide valuable guidance for effectively improving the CFP removal efficiency by external regulation for growth enhancement.

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Section: Resultsmentioning

confidence: 99%

Evolution of Condensable Fine Particle Size Distribution in Simulated Flue Gas by External Regulation for Growth Enhancement

Zheng

Shen

et al. 2020

Environ. Sci. Technol.

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“…The introduction of the proposed changes to the geometry of the discharge electrodes will not increase the efficiency of extraction of dust with diameter less than 2.5 microns (PM 2.5 ). Effective separation in the electrostatic precipitator of this grain fractions requires special technologies (agglomerators) [8,22].…”

Section: Resultsmentioning

confidence: 99%

Modelling and study the effect of selected design features for the operating parameters

Karwat¹,

Nocuń²,

Machnik³

et al. 2016

EiN

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“…The convergence of particles can be caused by a variety of reasons (Brownian motion, the presence of a velocity gradient in a moving medium, flow turbulization, electrical interaction of particles, hydrodynamic interaction, etc.). The coagulation has different names according to these reasons: Brownian [1], gradient [2], coagulation in a turbulent flow [3], etc.…”

Section: Introductionmentioning

confidence: 99%

The Limits of Fine Particle Ultrasonic Coagulation

et al. 2021

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This paper describes the studies conducted in order to identify the limits of ultrasonic exposure’s effect on the fine particle coagulation process. It has been established as a result of the studies that ultrasonic exposure with a sound pressure level of 160 dB is capable of ensuring coagulation of particles sized 2.5 µm with efficiency δ = 83%. An increase of the coagulation up to 13% is induced with generation of swirling flows. The suggested approach to increasing the coagulation efficiency owing to vortex-type flows between the radiating and reflecting surfaces ensures efficiency of coagulation δ = 96 %. The implementation of this approach has shown that with generation of vortex-type acoustic flows, it makes the most sense for a concentration of particles of 18×10−3 g/m3. Incremental efficiency at such concentrations amounts to 50%.

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Systematic Approach to Optimization of Submicron Particle Agglomeration Using Ionic-Wind-Assisted Pre-Charger

Cited by 22 publications

References 26 publications

Evolution of Condensable Fine Particle Size Distribution in Simulated Flue Gas by External Regulation for Growth Enhancement

Evolution of Condensable Fine Particle Size Distribution in Simulated Flue Gas by External Regulation for Growth Enhancement

Modelling and study the effect of selected design features for the operating parameters

The Limits of Fine Particle Ultrasonic Coagulation

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