E202 高圧下における排気再循環を用いたDMEの低NOx燃焼(OS9 熱・流動(試験))

概要

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This study focuses on the fundamental characteristics of DME (Dimethyl ether) combustion with exhaust gas recirculation EGR, aiming at a development of the low NOx combustion technology of DME under the high pressure. EGR reduces the NOx emission by recirculating the exhaust gas into the combustion chamber. DME has high potential of applicability of EGR because of its high burning velocity and low ignition temperature compared with methane and propane. The combustion test is conducted with laboratory-scale 8kW combustor. Initial air ratio λ is 1.5. At the atmospheric pressure, the NOx concentration without EGR is 45ppm at 0%-O_2. At 54% of the maximum EGR ratio, the NOx concentration reduces to 10ppm. By increasing the pressure to 0.3MPa, the NOx concentration without EGR increases to 84ppm. At 59% of the maximum EGR ratio which is almost the same with that at atmosphere pressure, the NOx concentration decreases to 17ppm. The exhaust gas recirculation is effective to the low NOx combustion of DME at the high pressure.
2011-06-22