Reduced NO formation models for CFD simulations of MILD combustion

Two reduced kinetic models, incorporating thermal, N(2)0, NNH as well as HNO/NO2 intermediate routes, are proposed for the quick evaluation of NO emissions from MILD combustion of H-2-enriched fuels through post-processing of Computational Fluid Dynamics simulations. The models were derived from a Rate Of Production Analysis carried out with two different detailed kinetic schemes. The models were tested using data from the Adelaide Jet in Hot Coflow burner fed with CH4/H-2 mixture and operated with three different O2 contents. Very satisfactory predictions of in-flame NO measurements were achieved for the three cases, indicating a good applicability of the models across a wide range of MILD combustion conditions. Significant impact of the NNH intermediate path was observed. Copyright (C) 2015, Hydrogen Energy Publications, LLC