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http://dx.doi.org/10.7837/kosomes.2021.27.1.153

Treatment Technology of N2O by using Bunsen Premixed Flame  

Jin, Si Young (Division of Marine System Engineering, Korea Maritime & Ocean University)
Seo, Jaegeun (Division of Marine System Engineering, Korea Maritime & Ocean University)
Kim, Heejae (Division of Marine System Engineering, Korea Maritime & Ocean University)
Shin, Seung Hwan (Division of Marine System Engineering, Korea Maritime & Ocean University)
Nam, Dong Hyun (Division of Marine System Engineering, Korea Maritime & Ocean University)
Kim, Sung Min (Division of Marine System Engineering, Korea Maritime & Ocean University)
Kim, Daehae (Clean Energy System R&D Department, Korea Institute of Industrial Technology (KITECH))
Yoon, Sung Hwan (Division of Marine System Engineering, Korea Maritime & Ocean University)
Publication Information
Journal of the Korean Society of Marine Environment & Safety / v.27, no.1, 2021 , pp. 153-160 More about this Journal
Abstract
Nitrous oxide is a global warming substance and is known as the main cause of the destruction of the ozone layer because its global warming effect is 310 times stronger than carbon dioxide, and it takes 120 years to decompose. Therefore, in this study, we investigated the characteristics of NOx emission from N2O reduction by thermal decomposition of N2O. Bunsen premixed flames were adopted as a heat source to form a high-temperature flow field, and the experimental variables were nozzle exit velocity, co-axial velocity, and N2O dilution rate. NO production rates increased with increasing N2O dilution rates, regardless of nozzle exit velocities and co-axial flow rates. For N2O, large quantities were emitted from a stable premixed flame with suppressed combustion instability (Kelvin Helmholtz instability) because the thermal decomposition time is not sufficient with the relatively short residence time of N2O near the flame surface. Thus, to improve the reduction efficiency of N2O, it is considered effective to increase the residence time of N2O by selecting the nozzle exit velocities, where K-H instability is generated and formed a flow structure of toroidal vortex near the flame surface.
Keywords
Bunsen flame; $N_2O$; Premixed flame; Greenhouse gas; $NO_x$;
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