IMPROVING VESSEL’S MAIN ENGINE LUBRICATION ALGORITHM
10.33815/2313-4763.2021.1.24.106–116
Abstract
Timely and accurately dosed oil supply to the cylinders of a diesel engine is the key to its reliable and longterm operation. The article discusses spray lubrication, which is used for lubrication through cylinder liners. The article considers the prospects of changing the oil supply to a cylinder using existing technologies from MAN B&W. Recently, MAN B&W has focused on further enhancing oil savings. For the purpose of oil consumption reduction, the combustion chamber pressure has been increased in the newly built diesel engines. The increase in pressure, together with the increase in operating time at low load, led to increased water and acid condensation on cylinder walls, which in turn, initiates low-temperature corrosion in the combustion chamber. Proper and accurate oil dosage supplied by the lubrication system to the cylinder of a main engine allows not only to ensure the correct mode of lubrication of moving parts, but also to protect against corrosion of the cylinder liners surface. The manufacturers recommend that the settings of the cylinder oil supply system be obtained on the basis of service inspections and measurements that allow to obtain data on the wear of the combustion chamber parts (piston rings, liner, and arch). Carrying out service inspections and the subsequent analysis of its results is most often of subjective nature and depends on a training degree of an engineer performing the procedure. Carrying out measurements of the cylinder-piston group details (on many vessels) is also a subject to a number of difficulties (time, measuring tool, etc.) The authors have performed the analysis of the MAN & BW 6S70MC-C8 main engine lubrication system. The article specifies the required amount of oil to be supplied to the cylinder, as confirmed by the calculations, depending on the mode of ship main engine operation. These measures provide advanced lubrication characteristics, which improve cost efficiency by reducing the cost of the engine repair. The article states that the main engine of the vessel shall be operated at a load of up to 25%. Therefore, the article has presented the relevant diagrams demonstrating the required amount of oil consumption according to the entire engine characteristics modes.
References
2. MAN Diesel & Turbo. MAN Diesel & Turbo 2014. Retrived from http://www.tribocare.com/pdf/MAN%20Diesel%20and%20 Turbo%20SL 2014-571.pdf.
3. MAN Diesel & Turbo. Alpha Adaptive Cylinder-oil Control Alpha ACC. Retrived from http://www.morehod.ru/forum/download/file. php?id=19604.
4. Man&BW 6S70MC-C8 Operation Manual. Retrived from https://manes. com/applications/projectguides/2stroke/content/printed/S70MC-C8_2.pdf
5. Boznickiyj I. B. (2010). Sudovihe dvigateli vnutrennego sgoraniya. Tom 1. Konstrukciya dvigateleyj. Sankt Peterburg : Morkniga.
6. Gribinichenko M. V. (2010). Sudovihe ehnergeticheskie ustanovki : ucheb. posobie. Vladivostok : DVGTU.
7. Osipov O. V. (2011). Ehkspluataciya sudovihkh dvigateleyj vnutrennego sgoraniya : kurs lekciyj : uchebnoe posobie. Vladivostok : MGU im. adm. G.I. Neveljskogo.
8. Mityagin V. G., Okunev V. N., Martjyanov V. V. (2011). Problemih ehkspluatacii sudovihkh dizeleyj na razlichnihkh vidakh topliva. Zhurnal Universiteta vodnihkh kommunikaciyj, 3, 49–53.
9. Deyjnego Yu. G. (2008). Sudovoyj mekhanik. Tekhnicheskiyj minimum. Moskva : Morkniga.
10. Voznickiyj I. V. (2006). Povrezhdeniya i polomka dizeleyj. Primerih i analiz prichin. Sankt Peterburg : Modern.
11. Danichkin V. N. (2011). Analiz sovremennihkh sistem lubrikatornoyj smazki kreyjckopfnihkh malooborotnihkh dizeleyj. Nauchnihe trudih Daljrihbvtuza, 23, 98–108.
12. Provatar A. G., Budin A. A. (2016). Korrozionnaya i kavitacionnaya stoyjkostj cilindrovihkh vtulok sudovihkh dizeleyj. Agentstvo mezhdunarodnihkh issledovaniyj g. Surgut :
materialih mezhdunarodnoyj nauchno-prakticheskoyj konferencii, 194–205.
13. Zlenko M. A., Popovich A. A., Mutihlina I. N. (2016). Zadachi obespecheniya iznosostoyjkosti zerkala cilindrovihkh vtulok sudovihkh dvigateleyj vnutrennego sgoraniya. Vestnik Astrakhanskogo gosudarstvennogo tekhnicheskogo universiteta. Seriya «Morskaya tekhnika i tekhnologiya». Astrakhanj : Izdateljstvo AGTU, 3, 44–47.
14. Dorokhov A. F., Provatar A. G., Vorobjyov A. V. (2015). Kachestvo i nadyozhnostj sudovihkh dizeleyj. Vestnik Astrakhanskogo gosudarstvennogo tekhnicheskogo universiteta. Seriya «Morskaya tekhnika i tekhnologiya». Astrakhanj : Izdateljstvo AGTU, 2, 48–55.
15. Varbanets R., Karianskiy A. (2012). Analyse of marine diesel engine performance. Journal of Polish CIMAC. Energetic Aspects. Gdansk : Faculty of Ocean Engineering and Ship Technology Gdansk University of Technology, Vol. 7, Issue 1, 269–275.
