The influence of water injected on the reduction of NOx emissions in Diesel engine

Abstract

In recent years, diesel engine manufacturers have been looking for ways to reduce NOx emissions and smoke emissions to meet increasingly stringent standards. Although there are exhaust gases treatment methods to reduce NOX emissions, attempts are being made to control their production in the cylinder. Various methods are used to control the production of NOx in the cylinder: flue gas recirculation, multiple fuel injections. These methods lead to increased fuel consumption and pollutant emissions. To reduce the emission of NOx, the temperature in the combustion chamber must be reduced. By introducing water into the combustion chamber, the desired effect is obtained. In this paper we have studied the effect of lowering the temperature in the combustion chamber on the power of the engine and the emissions of NOx and particles. The study was made on a Renault 4-cylinder diesel engine, water cooled. During operation, a quantity of 5%, 10% and 20% of the amount of diesel introduced into the cylinder was injected into the intake manifold. During the tests, the engine power decreases with 3%. NOx emissions decreased by up to 22%, but particulate emissions increased by about 36%.