Shock-tube measurements of ignition delay times for ammonia

Ammonia is a common impurity that can be found in many gas turbine-type fuels derived from coal or biomass and can also be used directly as a fuel in internal combustion engines. Past research showed that ammonia can be the source of" fuel NOx" during its combustion but can also be used in NOx reduction strategies in industrials processes. It is therefore important to understand the details of the high-temperature oxidation of ammonia. Unfortunately, a strong disagreement was observed amongst detailed kinetics mechanisms from the literature for predictions under conditions of practical interest. Ignition delay time measurements for ammonia have been performed several decades ago and conditions are not well reported into the literature. To have well characterized data and to assess the validity of the models, new measurements have been performed in diluted conditions (98 and 99% Ar) and for large pressure (around 1.4, 11.0, and 30 atm), temperature (1560-2490 K), and equivalence ratio ranges (0.5, 1.0, and 2.0). Only one mechanism from the literature was capable of modeling these data with good accuracy. On the other hand, comparison with H2/O2/NOx literature data shows that this model requires improvements.

Shock-tube measurements of ignition delay times for ammonia Conference Paper