The paper deals with the strategy conceived by the authors in order to convert a formerly liquid-fuelled burner technology, of fuel-air (ultra-lean) rapid-mix type, on to a gas-fuelled design, possibly preserving its excellent characteristics of ultra-low emissions and high flame-process stability. To this end, a combined theoretical-numerical and experimental effort has been pursued, typically in parametric mode, in order to find an optimised set of geometrical, fuel injection and functional provisions capable of taking advantage both of the previous experience in connection with liquid-fuel operation and of the necessary design changes required by the new gas-fuel application. The paper discusses, for these new operational conditions, the parametric numerical analysis so far performed, as well as the philosophy underlying the conversion of the burner design criteria from liquid to gaseous fuel operation. For each design variation or adjustment progressively conceived, the corresponding technological implementation has been realized, mounted on the burner test-rig and experimentally tested. Though preliminary, the experimental data presented in the paper confirm, in terms of combustion efficiency, stability and emissions, the attainment of a significant milestone toward the successful conversion of the burner to gas-fuel operation.
Conversion to Natural Gas Operation of a Formerly Liquid-Fuelled Rapid-Mix Ultra-Low NOx Burner
CARUGGI, MARIO;NILBERTO, ALESSANDRO;PITTALUGA, FERRUCCIO
2005-01-01
Abstract
The paper deals with the strategy conceived by the authors in order to convert a formerly liquid-fuelled burner technology, of fuel-air (ultra-lean) rapid-mix type, on to a gas-fuelled design, possibly preserving its excellent characteristics of ultra-low emissions and high flame-process stability. To this end, a combined theoretical-numerical and experimental effort has been pursued, typically in parametric mode, in order to find an optimised set of geometrical, fuel injection and functional provisions capable of taking advantage both of the previous experience in connection with liquid-fuel operation and of the necessary design changes required by the new gas-fuel application. The paper discusses, for these new operational conditions, the parametric numerical analysis so far performed, as well as the philosophy underlying the conversion of the burner design criteria from liquid to gaseous fuel operation. For each design variation or adjustment progressively conceived, the corresponding technological implementation has been realized, mounted on the burner test-rig and experimentally tested. Though preliminary, the experimental data presented in the paper confirm, in terms of combustion efficiency, stability and emissions, the attainment of a significant milestone toward the successful conversion of the burner to gas-fuel operation.
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