Numerical calculation of combustion flow field of honeycomb ceramics in coal mine low concentration gas thermal oxidation
In order to study the dynamics of low-concentration methane combustion within honeycomb ceramic structures in coal mining environments,advanced numerical simulations were employed.A model,integrating periodic boundary conditions,detailed methane combustion processes,and the interplay of turbulent and laminar flows in rectangular microchannels,was developed.The effect of premixed gas velocity,methane volume fraction,and preheating temperature variation on the combustion characteristics in these structures were investigated.The results reveal that the velocity of the premixed gas predominantly influences the rate of flame spread and the maximum temperature reached within the combustion zone,with higher velocities inducing more pronounced temperature gradients at the flame front.Conversely,decreasing the methane volume fraction results in a significant shift of the flame front towards the back,along with a marked reduction in both the peak temperature and chemical reaction rates,leading to cooler overall flow field temperatures.Furthermore,raising the temperature of the incoming premixed gas enhances the peak flame temperature and accelerates the chemical reactions involved.
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