Experimental Investigation of Hydrogen Port Fuel Injection with SCR in a DI Diesel Engine

Diesel engines are the main prime movers for public transportation vehicles, stationary power generation units and for agricultural applications. Hence it is very important to find a best alternate fuel, which emits fewer pollutants into the atmosphere from diesel engines. In this regard hydrogen is receiving considerable attention, as an alternative source of energy to replace the rapidly depleting petroleum resources. Its clean burning characteristics provide a strong incentive to study its utilization as a possible alternate fuel. Hydrogen injection along with selective catalytic converter shows very attractive results both from the performance and emissions point of view. A maximum reduction in oxides of nitrogen (NOx) of 74% is achieved for a (ratio of flow rate of ammonia to the flow rate of NO) of 1.1 with a marginal reduction in efficiency. The reduction in both hydrocarbon (HC) and NOx emission is one of the major advantages of Selective Catalytic Reduction (SCR) system. The maximum reduction in HC is about 83% at low loads with an overall reduction of 73%. Carbon monoxide (CO) emission reduced by about 63%. The carbon dioxide (CO2) emission increased by 10%. Selective catalytic reduction technique has been found to be an effective method of reducing pollution form hydrogen fueled diesel engine.