Submicron particles removal by charged sprays. Fundamentals

Jaworek, A.; Krupa, A.; Sobczyk, Arkadiusz; Marchewicz, Artur; Szudyga, M.; Antes, Teresa; Balachandran, W.; Natale, F. Di; Carotenuto, Claudia

doi:10.1016/j.elstat.2012.11.028

Cited by 62 publications

(28 citation statements)

References 69 publications

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“…Particles obtain electric charge by filed charging (Pauthenier and Moreau-Hanot, 1932) or diffusional charging (White, 1951). Considering the size of particles and discharge frequency, the diffusion charging is dominant compared with field charging (Jaworek, et al, 2013). The electric charge by diffusional charging can be estimated by the White's equation (White, 1951) and the theoretical value is 9.3x10 -3 C/g (3.3 e/particle) for the typical experimental conditions of this study.…”

Section: Powder Transportation Characteristicsmentioning

confidence: 92%

Nano powder transportation by combining plasma actuation and electrostatic mixing in a tube

Takana

Nakakawaji

Uehara

et al. 2015

JFST

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Abstract"Plasma Tube" is proposed for nano particle transportation and for particle surface purification in this study. The well-controlled efficient nano particle transportation is realized by combining plasma actuation, electrostatic force and high oxidation potential of produced ozone in a tube. Nano particles in the plasma tube can be transported in axial direction with swirl. Nano particles near the inner electrode wall jump due to electrostatic force, which can suppress particle clogging in a tube. The characteristics of plasma induced flow, particle charging and ozone generation are experimentally clarified in this study for various electrode angles and electrical conditions. Finally, the powder transportation rate is quantitatively evaluated. The alumina powder with average diameter of 30 nm can be transported at the maximum rate of 2.8 mg/s at consumption power of as low as 0.35 W for the transportation distance of 100 mm.

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Section: Powder Transportation Characteristicsmentioning

confidence: 92%

Nano powder transportation by combining plasma actuation and electrostatic mixing in a tube

Takana

Nakakawaji

Uehara

et al. 2015

JFST

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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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“…The same manner, Clair (1994) brought the Smoluchowski's theory which stated that "the reciprocal of the number of particles per unit volume varies as a linear function of time". The said theory is applicable to employ the agglomeration of TSP and PM10 dust after spaying 10-micrometer water drop from 10-micrometer diameters of multiple-phase nozzle orifices on its horizontal and vertical distribution in order to increase the gravitational forces the water-drop-attracted smaller dust particles finally accumulating on the ground floor (Brabec 2003;Charinpanitkul & Tanthapanichakoon 2011;Gardner, 1955;Gaunt et al 2003aGaunt et al , 2003bHidy & Brock 1971;Jaworek et al 2013). …”

Section: Coagulation Between Water Droplets and Dust Particlesmentioning

confidence: 99%

“…Normally, the fly dust (suspended dust) is surely one of the atmospheric component in the state of Brownian motion without direction according to the thermal forces of convectional process as one of heat transfer processes from vertically warmer earth surface to cooler adiabatically atmosphere, and also horizontally warmer to cooler points (Brabec, 2003;Carotenuto et al 2010;Charinpanitkul & Tanthapanichkoon 2011;Hidy & Brock 1971;Gaunt et al 2003aGaunt et al , 2003bJaworek et al 2013). In paralleling of aforementioned statements, Sellers (1969); Linsley et al (1988); Grim (1962); Grunding et al (2006); Hidy and Brock (1971); Baver et al (1972); Gaunt et al (2003aGaunt et al ( , 2003b; Carotenuto et al (2010); Botkin & Keller (2005); Balachandran et al (2003) have done their research works and found that wind is identified as the supporting factors for fly dust moving, particularly turbulent wind and also dry season.…”

mentioning

confidence: 99%

Using Multiple-Phase Nozzles to Produce Water Droplets for Removing Smaller Dust Particles of Below MRT-BTS Saphan Khwai Station in Bangkok Thailand

Duangmal¹,

Bualert²,

Chunkao³

2014

MAS

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The research is intentionally aimed to employ the multiple-phase nozzles to produce the 10-micrometer water droplets in gas form to remove less 100-micrometer smaller dust particles by agglomeration process inside street tunnel on heavy traffic point sources at sky train MRT-BTS Saphan Khwai station in Bangkok. The four sets of 100-m hoses with 52 multiple-phase nozzles (208 nozzles) were established on 100-m beams (four beams), which are 21-m wide (5-m apart) and 5.575-m high, and connecting with high pressure pump (1,000 lbs/min) to press clean water 0.076 liters/min through the 10-micrometer orifice nozzles. The spraying time was about every 10 minutes during collecting TSP and PM10 dust by Hi-Volume Air Sampler on five periods of 05:00-08:00, 08:00-11:00, 11:00-14:00, 14:00-17:00, and 17:00-20:00 for 5-consecutive days, 30 November to 4 December 2008. Also, the air temperature, actual vapor pressure, and speed-direction wind measured at 1.5 and 5.0 meters in height underneath of the ceiling and above the roof of MRT-BTS Saphan Khwai station. Results found that the multiple-phase nozzles showed effectiveness to remove the smaller 100-micrometer dust particles underneath of MRT-BTS Saphan Khwai station by spraying 10-micrometer water droplets through 10-micrometer orifice nozzles. The decreasing concentration of TSP northerly 30.25 %, southerly 26.21 %; and also for PM10 northerly 39.96 %, southerly 40.39 %. Moreover, the concentration between street tunnel and northerly were decreased in both TSP (30.38%) and PM10 (40.17 %), and southerly were decreased in both TSP (30.05%) and PM10 (40.88 %). In case, on the central line effects between street tunnel and northerly found the decreases of TSP (30.64%) and PM10 (37.65%), southerly decreases of TSP (33.71%) and PM10 (43.78%). An increase of the 10-micrometer water droplets spraying frequency through multiple-phase nozzles (208 nozzles) is expected to gain more decreasing concentration down to under standard values. In addition, an applying the concentration of smaller 100-micrometer dust particles is useful for setting the automatic pumping operation that would be acceptable to the public.

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Submicron particles removal by charged sprays. Fundamentals

Cited by 62 publications

References 69 publications

Nano powder transportation by combining plasma actuation and electrostatic mixing in a tube

Nano powder transportation by combining plasma actuation and electrostatic mixing in a tube

Water Electrified Sprays for Emission Control in Energy Production Processes

Using Multiple-Phase Nozzles to Produce Water Droplets for Removing Smaller Dust Particles of Below MRT-BTS Saphan Khwai Station in Bangkok Thailand

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