The aim of this research was to examine the possibilities of NOx, emission abatement from high temperature industrial furnaces by controlling the gasdynamic parameters of natural gas flames. The following parameters were investigated: air and gas velocity at burner exit, air swirl angle, position of the burner nozzles and air staging. It has been shown that moderate swirling of the combustion air enhances the level of NOxthe lowest NOx, emissions are observed for parallel air and gas flow burners. It is also demonstrated that to attain successful NOx, abatement it is necessary to realize sufficient mixing of the flue gases with the combustion air before the flame temperature reaches its maximum value. The developed burner, enabling successful abatement of the maximum flame temperature, presents a large potential of industrial applications as a tool for NOxemission reduction from high temperature furnaces.
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