Contoured bushings for flame face burners

Abstract

The present invention discloses a novel apparatus and method for reducing the recirculation area at the inlet end of the burner. The recirculation area is reduced by changing the geometry of the inlet end to reduce the blunt body effect at the inlet end of the combustion liner via tapering of the liner wall thickness and tapering of the thermal barrier coating.

Description

technical field [0001] The present invention generally relates to an apparatus and method for directing a fuel-air mixture into a combustion system. More specifically, the hemispherical dome is positioned near the inlet of the combustion liner to direct the fuel-air mixture in a more efficient manner to better control the rate at which the fuel-air mixture enters the combustion liner while allowing the combustion liner Unfavorable aerodynamic effects in the inlet area are as small as possible. Background technique [0002] In order to reduce the amount of polluting emissions from gas-powered turbines, government agencies have enacted numerous regulations requiring reductions in the amount of nitrogen oxides (NOx) and carbon monoxide (CO). Lower combustion emissions are generally attributable to a more efficient combustion process, particularly with regard to fuel injector position, air flow rate, and mixing effectiveness. [0003] Older combustion systems used diffusion-ty...

AI Technical Summary

Problems solved by technology

[0005] However, although premixing fuel and air prior to combustion has been shown to contribute to lower emissions, the amount of fuel-air premix injected has a tendency to vary due to various combustor variables

Therefore, there are still barriers to controlling the amount of fuel-air premix that is injected into the combustor

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