Abstract
This paper deals with the technology of burning natural gas with combustion air preheated to 1300°C. The objective of this work is to assess the potential of several combustion models and NOx postprocessors for their abilities to predict NOx emissions. The steady-state computational results have been compared both with in-furnace measurements and with the measured furnace exit parameters. The following main conclusions have been drawn: (1) with the exception of the small region located within the natural gas jet, the computations resulted in good quality predictions: (2) the NOx has been formed in a thin elongated region (flamelet) located between the natural gas jet and the air jet: (3) the NO has been formed mainly by the thermal path, and the NO-reburning mechanism was of little importance: and (4) there are strong indications that the non-stationary behavior of the weak (fuel) jet must be accounted for if the predictions within the fuel jet were to be perfected.
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