Research results of marine diesel engine harmful emissions reducing by supplying additional components into the cylinder

A study was conducted in order to reduce harmful emissions of marine diesel by feeding additional components into the cylinder due to stricter requirements for the level of harmful emissions from marine power plants. It is noted that it is most difficult to achieve compliance with environmental requirements for diesel engines that have been built for more than 20 years and have been operated on ships for a long time. The use of complex methods to improve their environmental characteristics can lead to a significant increase in the cost of measures to modernize them and increase operating costs. The supply of additional components to diesel cylinders to reduce harmful NOx and COx emissions is considered. The experiments were carried out on a marine diesel generator based on diesel 1H17.5/24 with the use of water and ethanol supply to the cylinder. As a result of high-pressure water supply, a 30% reduction in NOx was noted, and no reduction in COx was noted. When ethanol is supplied, it is revealed that there is a positive effect on the reduction of NOx, but there is an increase in CO and exhaust gas temperature, which does not make it possible to unambiguously determine the positive effect. Additional research is required on the use of ethanol and other components as additional components to improve the environmental performance (reduce emissions) of marine diesel engines. Conclusions are drawn about the possibility of using alcohol solutions, changing the amount and time of supply of ethanol and other additional components to obtain more effective indicators.