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Examination of simplified mechanisms of CH4 combustion in N2/O2 and CO2/O2 atmosphere using mathematical modeling

Bibrzycki J., Poinsot T.

Archivum Combustionis

2011

Vol. 31 nr 4

255-262

The oxy- fuel combustion is one of the most promising facilitation techniques of CO2 sequestration. This technology is founded on absence of nitrogen in the oxidizer, which is replaced by carbon dioxide. Thus, the combustion speed and temperature are limited in comparison with pure CH4-O2 combustion. The usage of the oxidation mechanism of methane combustion depends on the oxidizer composition. For conventional, CH4-air combustion, two found reduced mechanisms in the literature were used in the simulations. Whereas, modified versions of those schemes were employed in the calculation in the nitrogen-free atmosphere. The validation of those mechanisms was performed using detailed methane combustion mechanism (GRI Mech 3.0 [1]) and entire results were collected from COSILAB 1D Stretched Laminar Premixed Flames package. The simulation of one-dimensional stretched premixed laminar flames was performed in order to examine reduced schemes in the conditions, which may occur in real applications. Calculations of the flame for various fresh mixture compositions were performed for equivalence ratio equal to one, initial mixture temperature 300 K and pressure one bar. For two-step mechanism, the minimum velocity, which is an important quantity for premixed stretched laminar flames, for methane-air combustion, was in better agreement with detailed computations compared to the four-step scheme. The comparable outcomes using GRI Mech and reduced mechanisms, for combustion of methane in CO2/O2 atmosphere, were obtained, for two different examined oxidizer compositions.