Comparison of DRM22 and GRI3.0 Combustion Mechanisms in Creating Flameless Combustion in a Lab-Scale Furnace

With the progress of science and technology, new processes were created in combustion, the most important goal of which was to optimize fuel consumption, increase efficiency, and specifically reduce the amounts of gaseous pollutants (such as nitrogen oxides and carbon monoxide). One of these new technologies is flameless combustion, which is based on the preheating of fuel and air and the dilution of oxygen in the air with the recirculation of combustion gases to create a proper mixing of the reactants. In the present study, the flameless combustion of methane gas is simulated in a laboratory combustion chamber. Its results are compared in two modes of using DRM22 (as a reduced mechanism) and GRI3.0 (as a complete mechanism). The results show that the mentioned mechanisms are able to calculate the distribution of temperature and chemical species with an error of 1.66% and 4.7% respectively, and with good accuracy compared to the experimental results. In the case of NOX, despite the 26% difference between the two mechanisms, the GRI3.0 mechanism calculated its concentration slightly more than expected. On average, the DRM22 mechanism is closer to the experimental results and has less calculation time.