Enhancement of diesel particulate matter collection in an electrostatic water-spraying scrubber

Ha, Tran Hong; Nishida, Osami; Fujita, Hirotsugu; Harano, Wataru

doi:10.1007/s00773-010-0086-x

Cited by 16 publications

(4 citation statements)

References 3 publications

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“…First observed during the fragmentation of liquid films and jets with bursting bubbles (Iribarne et al, 1967) and with pneumatic nebulizers, specific charge from 1 to 100 nC.kg -1 are reported for 100 µm droplets produced at a few L.min -1 (Vaaraslahti et al, 2002). Such scrubber supplied by sea water have been tested (Ha et al, 2010). 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).…”

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

confidence: 99%

“…Different charge-to-mass ratio of the collecting droplets (see next section 4.2.2) and different concentrations from mg to g.m -3 of sub-micron and micron sized particles, as discussed in section 4.3.2, have been tested over large range of exhaust aerosol flowrates. Wet electro-scrubbers have first been tested at higher flowrates up to 1700 Nm 3 .h -1 on exhaust aerosols from spark furnace, industrial boilers, diesel marine engines and other combustion sources (Penney, 1944;Eyraud et al, 1966;Pilat et al, 1974;Pilat et al, 1977;Metzler et al, 1997;Jaworek et al, 1998;Krupa et al, 2004;Jaworek et al, 2006a;Jaworek et al, 2007;Ha et al, 2010;Jaworek et al, 2011;Di Natale et al, 2013;Di Natale et al, 2015;Krupa et al, 2016). The total collection efficiency, defined in Figure 8, increases with electrical forces, especially for bipolar coagulation of oppositely charged particles and collecting droplets.…”

Section: Principle Mechanisms and Modelsmentioning

confidence: 99%

“…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. With higher charge per drop from ES, faster self-repulsions lower the droplets concentration on smaller lengths, a few cm from the ES nozzle, than from other nebulisers, as depicted in 3.3.1.5.…”

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: Principle Mechanisms and Modelsmentioning

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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“…Wet electrostatic scrubber is a spray tower equipped with an electrified spray unit for electrically charged water droplets generation and, optionally, a particle pre-charging unit. The electrostatic forces between droplets and particles lead to a more rapid and effective particle capture onto the droplets compared with conventional spray scrubbers [18,[22][23][24][25][26][27]. Besides, wet electrostatic scrubbers inherit all the structural and process advantages of conventional scrubbers as the low pressure drops and simple design and operation, as well as the ability to simultaneous removal of soluble gases.…”

Section: Water Electrified Sprays For Emission Control In Energy Prodmentioning

confidence: 99%

Water Electrified Sprays for Emission Control in Energy Production Processes

F.¹,

Carotenuto²,

Manna³

et al. 2016

IJHT

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Energy generation by fossil fuels produces significant amount of pollutants. Among the most toxic of them, there are SO2 and particulate matter. The first is a toxic gas that is subjected to severe regulations, the second is only partially regulated since the most toxic fractions of particles, i.e. the ultrafine particles, are nor easily measured neither properly captured by conventional technologies available at commercial level. Electrification of water sprays provide a reliable way to improve both the SO2 mass transfer rates and the particle capture efficiency, thanks to the multiple effects of electric charges imposed on the sprayed droplets. In this paper, we report experimental findings on the use of electrified sprays of water to reduce SO2 and particulate matter form a model flue gas. Tests were performed both laboratory and pilot scale. The experiments are compared with the performances of the same spray operated without electrification. In the pilot scale unit, particle removal efficiency is negligible and SO2 removal is up to 97% with the uncharged spray, The use of induction charging and exposure to corona pre-charging allow achieving >93% reduction of particulate matter and to >99% SO2 reductions. Experiments at laboratory scale shed light on the mechanisms of particle and SO2 capture. In particular, the experimental results revealed that a stochastic scavenging model presented in our former works (data not shown) well described the particle capture and that for charged droplets, the absorption rate for SO2 improved by about 60% respect to uncharged droplets.

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A Novel Approach to Reduce the Environmental Footprint of Maritime Shipping

Flagiello

Esposito

Natale

et al. 2021

J. Marine. Sci. Appl.

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Maritime shipping is a strategic sector with a strong international vocation and management. The need to define regulations valid for many different countries without generating disparities of treatment slowed down the formulation of environmental regulations, especially for atmospheric emissions. In particular, regulations pertaining to the reduction of sulphur compounds allowed two distinct approaches: the use of low-sulphur fuels or exhaust gas cleaning systems, the so-called Scrubbers. The actual implementation of these solutions presents specific concerns either related to the toxicity of atmospheric by-products and to the fuel cost or to the generation of polluting washwaters that may need treatment before discharge. In this paper we analyzed the potential environmental benefit deriving from the use of a distillate fuel, not compliant with current IMO Sulphur Regulations, together with a Scrubber. The pilot-scale experimental results indicated that a limited amount of water and/or scrubber volume is needed to reduce sulphur emissions below regulations on maritime shipping, especially with the addition of NaOH reaching a water-saving between 25%-33% compared to the use of pure seawater. Experiments indicated that scrubber washwater PAHs emissions are within the available water quality standards indicated by EU and USA guidelines. A bottom-up analysis on heavy metals concentration shed light on the prominent role of metal-parts corrosion on the washwater emissions. Taking into account for corrosion phenomena, the actual heavy metals concentration in the washwater deriving from scrubbing was normally below the water quality standards.

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Enhancement of diesel particulate matter collection in an electrostatic water-spraying scrubber

Cited by 16 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

Water Electrified Sprays for Emission Control in Energy Production Processes

A Novel Approach to Reduce the Environmental Footprint of Maritime Shipping

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