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http://dx.doi.org/10.15231/jksc.2015.20.3.008

Numerical Study of CO Reduction Characteristics in High-temperature Air Stream Diluted with Exhaust Gas  

Park, Ji-Woong (Pukyong National University, Department of Safety Engineering)
Oh, Chang Bo (Pukyong National University, Department of Safety Engineering)
Publication Information
Journal of the Korean Society of Combustion / v.20, no.3, 2015 , pp. 8-12 More about this Journal
Abstract
The CO reduction characteristics of hot air stream diluted with exhaust gas in a perfectly stirred reactor (PSR) were investigated numerically. The dilution ratio ($\Omega$), inlet temperature ($T_{in}$), and residence time ($\tau$) were considered as parameters to investigate the effects of those on the emission indices for CO and $CO_2$ (EICO and $EICO_2$). The roles of dominant reactions and the production rates of major species were analyzed. It was found from the EICO trend that the supplied CO in the air stream was consumed. The EICO increased negatively with $T_{in}$ at fixed $\tau$ regardless of $\Omega$. However, the magnitude of EICO and minimum inlet temperature for CO reduction showed complicated trend according to the variation of $\tau$. It was identified that the OH radical, generated from the reactions, $O_2+H{\leftrightarrow}O+OH$ and $2OH{\leftrightarrow}H+H_2O$, affected the CO reduction by the reaction, $CO+OH{\leftrightarrow}H+CO_2$. However, the CO emission ratio increased at sufficiently high inlet temperature range due to the thermal dissociation of $CO_2$.
Keywords
MILD combustion; Emission index; CO emission; PSR;
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Times Cited By KSCI : 1  (Citation Analysis)
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