촉매 연소기에서 희박 예혼합기의 연소특성 = Combustion Characteristics of Lean Premixed Mixture in Catalytic Combustors

다국어 초록 (Multilingual Abstract)

The aim of this paper is to investigate combustion characteristics of lean premixed mixture stabilized by catalytic surface reaction. The catalytic combustor consisted of a catalyst bed and a thermal combustor. The catalyst bed was made of two stage, Pd catalyst in the first stage and Pt catalyst in the second stage. Auto ignition of lean mixture took place in the thermal combustor. Ignition temperature was about 810~820℃ at the fuel-air ratio of 1.5~3.0% and the mixture veiocity of 11~18m/sec. The position of flame front in the thermal combustor moved toward back as preheat temperature increased and fuel-air ration decreased. The flame supported by surface reaction was stabilized without any flame stabilizers. NOx emissions from the catalytic combustor were below 2.0ppm(O₂15%) when gas temperature was limited below 1350℃. This result demonstrates that NOx emission from the catalytic combustor is much low comparing with conventional combustors.