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International Journal of Environment Science and Technology
Center for Environment and Energy Research and Studies (CEERS)
ISSN: 1735-1472 EISSN: 1735-1472
Vol. 13, No. 1, 2016, pp. 221-230
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Bioline Code: st16021
Full paper language: English
Document type: Research Article
Document available free of charge
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International Journal of Environment Science and Technology, Vol. 13, No. 1, 2016, pp. 221-230
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Influence of non-thermal plasma after-treatment technology on diesel engine particulate matter composition and NOx concentration
Babaie, M.; Kishi, T.; Arai, M.; Zama, Y.; Furuhata, T.; Ristovski, Z.; Rahimzadeh, H. & Brown, R. J.
Abstract
The effect of non-thermal plasma technology
for particulate matter removal and nitrogen oxide emission
reduction from diesel exhaust has been investigated. A
sample of exhaust was cooled to the ambient temperature
and passed through a dielectric barrier discharge reactor.
This reactor was employed for producing plasma inside the
diesel exhaust. A range of discharge powers by varying the
applied voltage from 7.5 to 13.5 kV (peak–peak) at a frequency
of 50 Hz has been evaluated during the experiments.
Regarding the NOx emission concentration, the
maximum removal efficiency has been achieved at energy
density of 27 J/L. Soot, soluble organic fraction and sulphate
components of diesel particulate matter have been
analysed separately, and the consequence of plasma
exposure on particle size distribution on both the nucleation
and accumulation modes has been studied. Plasma
was found to be very effective for soot removal, and it
could approach complete removal efficiency for accumulation
mode particles. However, when applied voltage
approached 12 kV, the total number of nucleation mode
particles increased by a factor of 50 times higher than the
total particle numbers at the reactor inlet. This increase in
nucleation mode particles increased even more when
applied voltage was set at 13.5 kV.
Keywords
Dielectric barrier discharge; Diesel emission reduction; Nitrogen oxides; Non-thermal plasma; Particulate matter
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