Analysis of Combustion, Extinction and Nox Formation of Oppoded-Jet Ch4/H2/Nh3 Diffusion Flames

Due to the shortage of hydrocarbon fuels and the increasing concerns of greenhouse gas emissions, this research project is aimed at the combustion, extinction and NOx emission of CH4/NH3 and H2/NH3 blended fuels. To reduce the CO2 emission, hydrogen with the advantages of high combustion efficiency and no carbon emission is considered as the future energy carrier, but the cost and the wide flammable range is the primary concern in the storage and utilization. Recently, NH3, as an alternative fuel for the power engines itself, has been viewed as the potential hydrogen carrier since NH3 is more stable and no carbon emission after combustion. Besides, NH3 can be blended with CH4 for future combustion application of gas turbine engines. Therefore, the blended fuels of CH4/NH3 and H2/NH3 make it attractive as a potential alternative fuel toward hydrogen economy. However, the wide variations of compositions in these blended fuels have a direct impact on the combustion, extinction and NOx emission characteristics, which will be the keys in the combustion applications. The numerical model which composed of the conservation equations of mass, momentum, species, and energy with narrowband radiation calculation and detailed chemistry is to resolve the laminar diffusion flames stabilized near the stagnation point region between two opposing jet flows. This research project is to investigate the combustion, extinction and NOx formation of opposed-jet CH4/H2/NH3 diffusion flames. The effects of strain rates, fuel compositions, environmental temperature and pressure on the flame structures, flammability and NOx formation behaviors are analyzed and compared.

Project ID:PB10708-3176
External Project ID:MOST107-2221-E182-034