Hermanson, James Carl
This project studied the effect of hydrogen addition on blow-off velocity and NOx emissions of a premixed lean methane-air flame at atmospheric conditions. The fuel mixtures were pure methane and a mixture of 9.6 vol% hydrogen in a 90.4 vol% methane. The experimental apparatus consisted of a 1-inch (2.54) diameter combustor with a quartz chimney 13-inch[es] (33 cm) in length. The flame was stabilized on a 0.245-inch (0.62 cm) diameter stainless steel cylindrical bluff-body flame holder with cold gas inlet velocity varying between 4 and 13 m/s. With the hydrogen addition, a decrease in fuel/air ratio and a decrease in NOx emissions were observed for a given cold gas inlet velocity. The experimental results were in reasonable agreement with the theoretical values. The flame became more stable due to the hydrogen addition. In addition, the exhaust gas temperatures at blow-off decreased with hydrogen addition, consistent with the observed decrease in NOx emissions.
Worcester Polytechnic Institute
Major Qualifying Project
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