Comprehensive improvement of the efficiency of lubrication systems of marine medium-speed diesel engines with high boost

Abstract

The toughening of the conditions for the functioning of lubricating oil in medium-speed diesel engines during their supercharging has put the improvement of their lubrication systems in the category of urgent tasks. The necessity of using motor oils MO with heat-resistant multifunctional ash additives and cleaners capable of removing finely dispersed insoluble products for heavy-duty engine lubrication is shown. The results of operational tests in a forced pressurized diesel engine of a lubrication system of increased efficiency are presented. The complexity of the approach to its improvement, which was the goal of the research, was to provide resource-saving oil use with a combination of multifunctional additives with well-balanced detergent-dispersant, antioxidant and anti-wear properties and cleaning agents that help slow down the aging of the lubricant. The importance of combining full-flow oil filtration for reliable protection of diesel bearings from the ingress of large particles of mechanical impurities that cause abrasive wear with means of centrifugal deep cleaning of oil from finely dispersed insoluble products that intensify the oxidation of MO has been proved. The indicators of filters and centrifuges, the complete set of which lubrication systems of engines makes it possible to fully realize the advantages and benefits of different cleaning methods according to the principle of operation, are substantiated. The originality of the new technical solutions for oil purifiers consisted in increasing the throughput and selectivity of filtering out contaminants by filter elements, improving the speed and spinning characteristics of the centrifuge. A comparison is made of the efficiency of purification of motor oils of medium and high functional levels by filters with a nominal fineness of screenings of 30 microns in combination with a centrifuge equipped with a reactive hydraulic drive. The efficiency of lubrication systems of different configurations is compared. It has been proved by a motor experiment that when operating on distillate oil products - marine low-viscosity fuel MLVF or MDO, resource-saving oil-use in marine forced medium-speed diesel engines with an average effective pressure of 0.8–2.4 MPa is achieved when operating on M-10G2CL oil and cleaning it with full-flow filter and bypass connected centrifuge.