Analysis of the possibility of using low speed twostroke dual-fuel engines for propulsion of sea-going vessels

• Autorzy: Giernalczyk Mariusz

Identyfikatory

DOI

10.2478/kones-2019-0031

• Języki publikacji: EN

Abstrakty

EN

The use of gas/LNG to supply marine engines in addition to tangible economic benefits is also a method of limiting emissions of harmful substances into the atmosphere and meeting strict environmental protection regulations, especially in special areas. The technology of supplying liquid and gas fuels (Dual Fuel) is most easily used in four-stroke engines but the highest thermal efficiency is ensured by combustion two-stroke piston engines. However, in the first two-stroke dualfuel engines, the gas supply installation was more complicated than in the four-stroke engine. It resulted, among others from the necessity of compressing the gas to high pressures (15÷30 MPa), for which extremely energyconsuming multi-stage compression systems were needed. The complicated technical system is inherently prone to failures, which is why the dual-fuel low-speed two-stroke diesel engines remained for a long period in the design and experimental phase. In recent years, there has been a significant breakthrough thanks to the introduction of new solutions with the possibility of supplying two-stroke engines with low-pressure gas (less than 1.6 MPa). In recent years, many ships powered by two-stroke, dual-fuel internal combustion engines were commissioned. Some shipowners owning a fleet of LNG carriers with two-stroke diesel engines that so far have been powered only by liquid fuels have decided to adapt them to gas combustion. This required the adaptation of the engine for gas combustion and the expansion of the supply gas fuel system. This paper is an attempt to analyse the legitimacy of introducing two-stroke, dual-fuel internal combustion engines into the propulsion system and adaptation of engines that are already used to burn gas in them. It presents the changes introduced on one of the LNG gas carriers consisting in adapting the engine to gas combustion through modification of the cylinder head and fuel supply installation. Parameter results of the modified engines obtained during sea trials have been presented. Both advantages and disadvantages resulting from gas combustion have been pointed out. Finally, the possibility of this solution application to other LNG carriers was assessed.

Słowa kluczowe

EN

natural gas; LNG carriers; low speed 2-stroke dual-fuel engines

• Wydawca: Łukasiewicz Research Network - Institute of Aviation ; European Science Society of Powertrain and Transport KONES Poland ; Wydawnictwo Instytutu Technicznego Wojsk Lotniczych
• Czasopismo: Journal of KONES
• Rocznik: 2019
• Tom: Vol. 26, No. 2
• Strony: 45--52
• Opis fizyczny: Bibliogr. 11 poz., rys.

Twórcy

autor

Giernalczyk Mariusz

• Gdynia Maritime University, Marine Power Plants Department Morska Street 83, 81-225 Gdynia, Poland tel.: [phone]

Bibliografia

• [1] Giernalczyk, M., Analysis possibilities of cost reduction related to boil-off fuel gas being carried on LNG Gas Carriers, PAN Journal of KONES Powertrain and Transport, European Science Society of Powertrain and Transport Publication, Warsaw 2007.
• [2] Giernalczyk, M., Analysis possibilities of the application of dual fuel engines as a main propulsion on LNG Gas Carriers, PAN Journal of KONES Powertrain and Transport, European Science Society of Powertrain and Transport Publication, Warsaw 2008.
• [3] Giernalczyk, M., Łoński, F., Kaniak, W., Ways of adjusting the two-stroke diesel engine to be run on liquefied natural gas, New trends in production engineering, Vol. 1, Is. 1, pp. 317-324.
• [4] Linwood, J., Jong-Pil, Ha, Kjeld, A., Rene, S.L., LNG Gas Carrier with High-pressure Gas Engine Propulsion Application, GasTech, Dubai, United Arab Emirates 2006.
• [5] LNG Carrier Propulsion by ME-GI Engines and/or Reliquefaction, MAN Diesel & Turbo, Denmark 2003.
• [6] LNG Carriers with ME-GI Engine and High-Pressure Gas Supply System, MAN Diesel & Turbo, 5510-0026-04ppr, Denmark 2014.
• [7] MAN, S70 ME-GI Project Guide, 2nd Edition, October 2005.
• [8] Significant Ships of 2013-2018, A publication of the Royal Institution of Naval Architects, London UK 2013-2018.
• [9] www.dnvgl.com/maritime/lng/current-price-development-oil-and-gas.html.
• [10] www.wingd.com/en/documents/rt-flex50df/engine-operation/operation-manual-(om).
• [11] www.wingd.com/en/documents/general/brochures/x-df-faq-brochure.pdf/.

Uwagi

Opracowanie rekordu w ramach umowy 509/P-DUN/2018 ze środków MNiSW przeznaczonych na działalność upowszechniającą naukę (2019).