An experimental investigation of the conversion of NO to NO2 in a simulated gas turbine environment
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Computer modeling utilized the CHEMKIN chemical kinetics program and a subset of a previously published C-H-O-N system mechanism. Experimental work was conducted using a high pressure flow reactor designed and built in the course of the study. The effects of pressure, temperature, and the presence of a N02 promoting hydrocarbon, methane, were investigated. It was discovered that as pressure increased from 1 atm. to 8.5 atm., the rate and amount of NO converted to N02 also increased. There also appeared to be a temperature "window" between approximately 800 and 1000 K in which NO to N02 conversion readily occurred. The presence of methane was seen to enhance NO conversion to N02, and a ratio of [CH4]/[NO] was found to be a useful parameter in predicting N02 formation. Significant NO conversion to N02 was noted for [CH4]/[NO] > 1 at the hydrocarbon injection point. Experimental results validated those trends obtained from modeling with a modified C-H-O-N mechanism.
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