Charged spray generation for gas cleaning applications

Krupa, A.; Jaworek, A.; Sobczyk, Arkadiusz; Marchewicz, Artur; Szudyga, M.; Antes, Teresa

doi:10.1016/j.elstat.2012.11.022

Cited by 34 publications

(10 citation statements)

References 3 publications

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“…Charged droplets can be produced by different processes with variable charge-to-mass ratio (Bailey, 1988;Vaaraslahti et al, 2002;Pilat et al, 2004;Krupa et al, 2013). Charged droplets may be produced without liquid polarization, by charge separation during breakup of the liquid double layer.…”

Section: Methods For the Production Of Charged Water Droplets For Bipmentioning

confidence: 99%

“…Water droplets can also be charged by Corona ions (Xu DX et al, 2003) to lower levels than by the simplest induction charging by liquid polarization in mechanical nebulizers, achieving up to 10 % of the Rayleigh charge limit (Bailey, 1988). Charge-to-mass ratio from 10 -3 to 1 mC.kg -1 have been measured for 50 µm water droplets from pressure nebulizers where the liquid is pressurized across an orifice (Pilat et al, 2004;Krupa et al, 2013) and from pneumatic nebulizers (Metzler et al, 1997;Yang HT et al, 2003). ES is used to achieve tunable and higher charge per drop -by induction charging as well-, but without dilution of the aerosol to be filtered by additional gas flow for the production of charged droplets (Lear et al, 1975;Hara et al, 1984).…”

Section: Methods For the Production Of Charged Water Droplets For Bipmentioning

confidence: 99%

“…Minimum collection efficiency above 80 % were achieved for submicron test aerosol with MPPS around 0.2 to 0.3 µm with 2 and 1.6 L.m -3 of waste water per unit volume of filtered gas, respectively for pressure (Pilat et al, 1974) and pneumatic nebulizers (Calvert et al, 1978) (see apendix A1). For real exhaust aerosol concentration from diesel engines, up to 10 6-7 cm -3 (~g.m -3 ), similar pressure nebulizer with a full cone spray achieve 93% efficiency with 290 µm droplets (0.135 mC.kg -1 ) for 0.2µm combustion aerosol with half the water consumption (Krupa et al, 2013;Di Natale et al, 2015;Di Natale et al, 2016b). For similar aerosol, the reader can also refer to (Ha et al, 2010) with sea water droplets.…”

Section: Fractional Efficiencies (Vs D P ) Of Bipolar Scrubbersmentioning

confidence: 99%

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Review on water electro-sprays and applications of charged drops with focus on the corona-assisted cone-jet mode for High Efficiency Air Filtration by wet electro-scrubbing of aerosols

Borra

2018

Journal of Aerosol Science

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 electrosprays is a continuous production process of self-dispersed unipolar droplets with monodisperse/unimodal size distributions (0.2 < d modal < 150 µm)  Applications of ES of aqueous solutions are reviewed with special attention for material production and bio-applications  Means to achieve steady water ES are presented with respect to electrical discharges in ambient air around the liquid cone and jet  Streamer discharges with transient and asymmetric space charges disrupt the EHD equilibrium for steady cone-jet mode, while the axisymmetric and quasi-stationary space charge is required to achieve steady water ES in the pulseless corona-assisted cone-jet mode  Empirical scaling laws of droplet properties are reminded for both steady water ES in cone-jet with a pulseless corona and without discharge  High filtration efficiencies of a lab-scale wet bipolar-scrubbers (>99%) supports that Water ES in corona-assisted cone-jet could be applied to low cost Air cleaning

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Section: Methods For the Production Of Charged Water Droplets For Bipmentioning

confidence: 99%

Section: Methods For the Production Of Charged Water Droplets For Bipmentioning

confidence: 99%

Section: Fractional Efficiencies (Vs D P ) Of Bipolar Scrubbersmentioning

confidence: 99%

See 1 more Smart Citation

Review on water electro-sprays and applications of charged drops with focus on the corona-assisted cone-jet mode for High Efficiency Air Filtration by wet electro-scrubbing of aerosols

Borra

2018

Journal of Aerosol Science

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“…For opposite-polarity, charged-droplets and charged-particles WES, particles deposit onto the droplet due to electrostatic attraction forces. Many studies, including numerical simulations (Pilat et al 1974;Wang et al 1986;Jaworek et al 1997Jaworek et al , 2002Kojevnikova and Zimmels 2000;Yang et al 2003;Zhao and Zheng 2008;Carotenuto et al 2010) and experimental tests (Kraemer and Johnstone 1955;Balachandran et al 2003;Jaworek et al 2006b;Krupa et al 2013), suggest that droplet-target deposition of the particles is more effective. One important reason is that the distances of deposition from particles to droplets are much closer than to chamber walls, closer distance in turn strengthens the electrostatic attractions.…”

Section: Introductionmentioning

confidence: 99%

Characteristics of particles deposited on a single free-fall charged droplet

Zuo

Wang

Huo

et al. 2016

Aerosol Science and Technology

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Particles deposited on a free-fall charged droplet were experimentally studied. A droplet, charged under 40% Rayleigh limit, fell through the particle chamber to capture particles by electrostatic attractions. The velocity of the droplet was smaller than 2.1 m/s. The particle-laden droplet eventually spread on a glass slide, which was further analyzed using optical microscope. It was found that the equivalent number of particles captured by the charged droplet were larger than that of uncharged ones by one order of magnitude at least. Remarkably, particles on the charged droplet agglomerated into a large cluster, which indicates that the agglomerated cluster can be actively precipitated due to the gravity force if the droplet completely evaporates. The front side of the charged droplet was the predominant region to capture the particles. However, the actual area of capture was smaller than hemispheric surface.

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“…It is applied in fields such as vehicle transportation, road construction, rock blasting of water conservancy and hydropower project, coal handling systems of power plant, tunnel construction, stock ground of metallurgical enterprise, concentrating mill, mine and other producing dust places,but the dust suppression effect of conventional single nozzle spray was limited. Improving dust suppression effect was researched on charged water spray, high-pressure spray, magnetized water spray ,and pressure gas and water spray,which are limited in term of dust reduction efficiency and applicability [1][2][3][4][5][6][7] . Therefore, the trial tests on self-priming spray magnetization dust suppression were carried out on the basis of previous studies.…”

Section: Introductionmentioning

confidence: 99%

Tests on droplets and dust suppression characteristics with self-priming spray magnetization

Ma¹,

Huang²,

Xiong³

et al. 2017

Proceedings of the 2016 International Conference on Engineering and Advanced Technology

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ABSTRACT:To improve the effect of spray and dust reduction, self-priming spray magnetization dedusting was put forward. Moreover, some experiments on droplets and dedusting characteristics were carried out, such as traditional single-nozzle spray, self-priming non-magnetic spray, selfpriming spray with magnets on throat, self-priming spray with magnets on the diffusion tube, and self-priming spray with magnets both on the throat and diffusion tube respectively. The results showed that the SMD value of the self-priming spray was reduced by approximately 12% to 20% and dust reduction efficiency was increased by approximately 5% to 7% compared with the conventional single nozzle, while the SMD value of self-priming spray with magnets was reduced by approximately 10% to 15% and dust reduction efficiency was increased by approximately 6% to 15% compared with the self-priming spray without magnets, the SMD value of self-priming spray with magnets both on the throat and the diffusion tube was less than that of self-priming spray plus magnets on throat or diffusion tube alone, and the dust reduction efficiency was increased by approximately 5%.

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Charged spray generation for gas cleaning applications

Cited by 34 publications

References 3 publications

Review on water electro-sprays and applications of charged drops with focus on the corona-assisted cone-jet mode for High Efficiency Air Filtration by wet electro-scrubbing of aerosols

Review on water electro-sprays and applications of charged drops with focus on the corona-assisted cone-jet mode for High Efficiency Air Filtration by wet electro-scrubbing of aerosols

Characteristics of particles deposited on a single free-fall charged droplet

Tests on droplets and dust suppression characteristics with self-priming spray magnetization

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