Experimental and Numerical Investigations of Emission Characteristics from Diesel-Ammonia-Fueled Industry Engines

Combustion and emission characteristics of diesel- ammonia-fueled internal combustion engines were obtained by simulation and experiment with a multi- cylinder industry engine to reduce nitrous oxide, N2O, emission which has high global warming potential. The test engine was based on 4-stroke-cycle diesel engine with common rail injection system and ammonia gas was introduced in intake air. Simulation result by combustion CFD with detailed chemistry showed N2O remains at unburned ammonia-air mixture region, and simultaneous reduction of both N2O and unburned ammonia has been expected in high in-cylinder temperature. The test result showed unburned ammonia reduced along with increased in-cylinder temperature in high equivalence ratio and advanced injection timing conditions. Also, N2O reduced along with increased in-cylinder temperature in the most cases. 82% reduction of greenhouse gas was achieved compared with conventional diesel engine by applying 94% of ammonia in total fuel energy at full load condition, and it turned out that further reduction of unburned ammonia and NOx were required.