CRECK-S: A Detailed Kinetic Mechanism for the Combustion of CO-Rich Streams Carrying HCN, NH 3 , NO x and SO x

No published kinetic mechanism simultaneously describes C1–C4 hydrocarbon oxidation, HCN and NH3 chemistry, selective non-catalytic reduction (SNCR) and reburning of NO, and the influence of SO2 on them. That combination governs combustors fed with CO-rich, nitrogen- and sulfur-laden streams: FCC flue gas, ammonia co-firing and refinery off-gases. Eight nitrogen and two sulfur mechanisms are benchmarked against jet-stirred-reactor, plug-flow and laminar-flame experiments, with deviations quantified by the mean absolute error normalized by the peak measured value (nMAE). CRECK is best overall except for HCN oxidation, where the Glarborg mechanism is more accurate. CRECK-S (209 species, 2816 reactions) adopts those HCN kinetics and adds the Ravikumar sulfur sub-mechanism with complete transport data. It lowers the HCN error in all six validation experiments and three cyanuric-acid deNOx cases, while matching parent NH3, SNCR and reburning predictions within two points. The mechanism is openly released in Cantera format.