| In 1998, a novel approach called Selective NOx Recirculation (SNR) was used to reduce NOx emissions in diesel engines. The SNR concept relies on two major parts, one to collect the NOx emissions from the exhaust using an adsorber, and another to decompose NOx using the in-cylinder combustion process by injecting the collected NOx emissions into the intake manifold at an elevated concentration. This research assesses the decomposition percentage (%) during the combustion process.; A 1992 DDC series 60, 360 hp, 12.7 liter engine was connected to a 500 hp DC dynamometer. Bottled nitric oxide (NO) gas was injected into the intake manifold through a mass flow controller in order to assess NOx decomposition at various loads and concentrations. It was observed that a highest value of 57% of NO was decomposed when the engine was operated at the intermediate speed (1200 rpm) and 100% load point (1310 ft-lb). |
