Numerical Study on Laminar Burning Velocity of Ammonia Flame with Methanol Addition
Combustion characteristics of ammonia/methanol mixed gas were studied through numerical simulations to understand the significant enhancement of methanol on the laminar burning velocity of ammonia.Based on six mechanisms selected from literatures reported,a simplified and reliable chemical reaction mechanism for ammo-nia/methanol combustion was developed,and their accuracy was verified.This mechanism can accurately predict the laminar burning velocity of ammonia/methanol mixture at room temperature.Reaction pathway analysis based on the new mechanism for ammonia/methanol mixture combustion shows that methanol does not directly participate in ammonia oxidation but rather promotes ammonia dehydrogenation through the production of methyl radicals from methanol oxidation.NOx emission analysis indicates that the addition of 60% methanol results in the highest NOx emissions for the mixture gas.Yield analysis identifies the most important reactions which control the genera-tion and consumption of NOx.
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