IMPROVEMENT OF THE PROCESS OF PREPARATION OF PETROLEUM FUELS FOR MEDIUM-SPEED MARINE DIESEL ENGINES

Abstract

The issue of improving the process of preparing fuels of petroleum origin for medium-speed marine diesel engines is considered.It was determined that the use of liquid fuels of petroleum origin with increased density in medium-speed marine diesel engines requires its additional processing.One of the common methods of additional processing of fuel is the addition of special fuel additives to its volume.At the same time, manufacturers that ensure their supply to ships of sea and inland waterway transport do not determine the optimal concentration of additives in the volume of fuel, indicating only the possible range of this concentration.This leads to unnecessary consumption of fuel additives (the cost of which is up to three orders of magnitude higher than the cost of fuel), and can also cause an increase in the thermal intensity of the diesel engine and a deterioration in its environmental characteristics.The purpose of the study was to determine the impact of chemical fuel treatment on the main operational indicators of marine diesel engines, which characterize its economic, environmental and thermal intensity.The specific effective fuel consumption, nitrogen oxide emissions with exhaust gases and average exhaust gas temperature were taken as indicators.Studies carried out in the fuel systems of four identical 6L32F diesel engines manufactured by Wartsila yielded experimental results confirming the reduction in specific effective fuel consumption when using fuel additives.For different concentrations of the additive in the base fuel, a different amount of reduction in specific effective fuel consumption is observed, which is 1.8...4.7%.Also, for different concentrations of the fuel additive in the volume of fuel injected into the diesel cylinder, an improvement in the environmental friendliness of the diesel engine was determined, which is reflected in a 13.2...14.5% reduction in nitrogen oxide emissions with exhaust gases and a decrease in temperature stress, as evidenced by a 10...14°C decrease in the average exhaust gas temperature in the diesel cylinders.