Laboratory studies of back-discharge in fly ash

Jaworek, A.; Czech, T.; Rajch, E.; Lackowski, M.

doi:10.1016/j.elstat.2005.08.002

Cited by 37 publications

(14 citation statements)

References 31 publications

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“…The ions flowing from the spot to the discharge electrode can recombine, and neutralize the ions emitted by this electrode. In the case of electrostatic precipitator, the ions can also discharge the dust particles, decreasing thus the collection efficiency of the precipitator [5].…”

Section: Resultsmentioning

confidence: 99%

Comparative studies of dc corona and back discharges in different gases

et al. 2006

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Direct-current corona discharge and back-discharge generated in needle-plate electrode configuration in air, Ar, N 2 , or CO 2 , flowing smoothly through a discharge chamber were investigated. The back discharge is dielectric barrier discharge generated in the presence of normal corona discharge, when the plate electrode is covered with a dielectric layer of high resistivity. In the experiments with back discharge a mica plate was used as the dielectric barrier. A small pinhole was made in the plate center to initiate an electrical breakdown through the dielectric layer. Comparative studies of corona and back-corona discharges at normal temperature and pressure were carried out in the aspects of discharge morphology and the current-voltage characteristics.PACS : 52.80.Hc

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Section: Resultsmentioning

confidence: 99%

Comparative studies of dc corona and back discharges in different gases

et al. 2006

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“…In the literature, back corona has been observed at grounded electrodes covered with fly ash [8], [9], and at glass plates and mica plates containing pinholes [11], [23]. In those setups, the intense electric field near the pinholes or near the small craters formed in the ash layer facilitated the formation of an ionized gas cloud that was described as back corona.…”

Section: Discussionmentioning

confidence: 99%

“…Back corona has been widely known for its detrimental effect on electrostatic precipitators and studied in laboratory experiments with grounded plates covered with Manuscript fly ash, acrylic powder, and other insulating materials [8]- [10]. Some useful practical applications of back corona have been suggested such as gas cleaning by decomposing hydrocarbon contaminants [11]; however, such useful applications are not explored extensively.…”

Section: Introductionmentioning

confidence: 99%

Point-to-Point Corona Discharge in Admixtures of Argon, Oxygen, and Acetylene

Islam

Pedrow

Xie

et al. 2015

IEEE Trans. Plasma Sci.

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Multipoint-to-multipoint and multipoint-to-plane electrode geometries have been investigated to enhance corona discharge modes in atmospheric pressure weakly ionized plasma. This paper presents a new geometry approach by a protrusion array over the grounded screen along with a high-voltage (HV) needle array to obtain higher coulombic discharge. It has been observed that needle-to-grounded-screen-protrusion configuration enhances the discharge modes, especially the back corona is enhanced significantly near the protrusions in Ar/C 2 H 2 plasma. A corona mode map has been developed to depict the optimal discharge zones at various HV gaps. Similar investigations were performed in Ar/O 2 plasma to study the nature of the current pulses and discharge modes.Index Terms-Atmospheric pressure plasmas, back corona, point-to-plane corona discharge, weakly ionized plasma.

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“…Back-corona is an abnormal gaseous discharge that occurs at the collector electrode and takes place in the presence of corona discharge. The back-corona discharge occurs when the electric field across the dielectric layer is higher than its breakdown strength [7,8]. Eq.…”

Section: High Resistivity Effects On Esp'smentioning

confidence: 99%

Fly Ash Resistivity Profiling for South African Coal Fired Power Stations

Chauke¹,

Gouws²

2013

JEPE

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Particulate emission is a major problem in industrial processes, mainly power plants that make use of coal as a primary source of energy. Stringent emissions limits, set by government organisations requires industries to conform to these limits to ensure that air quality is sustained and with minimum pollutant present. Electrostatic precipitators are typically used to filter and collect these particulate emissions. Fly ash resistivity is a primary parameter in the collection of particulate emissions, and there is a resistivity range at which electrostatic precipitator collection is most efficient and anything outside this range limits, their operation. High resistivity ash results in back-corona discharge, whilst low resistivity results in particle re-entrainment into the flue gas stream. The purpose of this paper is to investigate and obtain a fly ash resistivity profile for existing power plants in South Africa. Ash samples obtained from power plants are, tested making use of an ash-resistivity test oven, in accordance with IEEE Standard 548-1984. This paper discusses obtained experimental results, to determine the resistivity profile at which South African power plant electrostatic precipitators operate. The electrical efficiency of the electrostatic precipitator system is evaluated based on the obtained resistivity profiles.

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Laboratory studies of back-discharge in fly ash

Cited by 37 publications

References 31 publications

Comparative studies of dc corona and back discharges in different gases

Comparative studies of dc corona and back discharges in different gases

Point-to-Point Corona Discharge in Admixtures of Argon, Oxygen, and Acetylene

Fly Ash Resistivity Profiling for South African Coal Fired Power Stations

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