Emissions from Gas-Turbine-Type Combustors
A combustion rig simulating gas turbine combustion has been used to study pollutant emissions, particularly those of carbon and nitrogen oxides, NOx, as a function of air-fuel mixing pattern. The use of metallic additives to remove carbon has been investigated and mechanisms proposed to account for the action of barium and manganese in this system. The influence of combustion chamber design on NOX emissions has shown that large variations in NOX level may occur and some correlation with primary zone residence time has been found. For a given flame tube design, no influence of either overall or primary zone air-fuel ratio (AFR) on NOX levels (normalized to stoichiometry) has been found. This surprising result is explained by either the existence of a combustion zone of constant AFR or diffusion-flame burning of the fuel.
KeywordsNitric Oxide Combustion Chamber Combustion Zone Smoke Emission Primary Zone
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