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Impacts of Using Exhaust Gas Recirculation and Various Amount of Dimethyl Ether Premixed Ratios on Combustion and Emissions on a Dual-Fuel Compression Ignition Engine

100%

Stepanenko D. , Rudnicki J. , Kneba Z.

tom Vol. 18, no 2

196--213

In the presented research, the authors dealt with the specific properties of the combustion process of dimethyl ether (DME) in a combustion car (Volkswagen Golf IV) engine AJM 1.9 TDI PDE made by Volkswagen factory. Dimethyl ether is an alternative fuel produced most often from natural gas, which can be used in compression ignition engines as a single fuel or co-burned with diesel oil. This work describes the impacts of using exhaust gas recirculation system and various diesel to DME substitution ratios from 0% to approximately 25% (on an energy basis), on the combustion process in a dual-fuel diesel engine. The engine has been modified so that DME fuel is introduced into the intake manifold just before the intake valves. The diesel fuel supply system, operation algorithms of the engine electronic control unit and other engine elements were left unchanged as it was built by the manufacturer

Alternative propulsion plants for modern LNG carriers

84%

Grzesiak S.

New Trends in Production Engineering

2018

tom Vol. 1, Iss. 1

399--407

This paper shows the latest evolution trends of propulsion plants of modern LNG tankers. Features of conventional and advanced steam plants were confronted with propulsion plants such as Dual Fuel - Diesel electric and plants equipped with slow speed two stroke diesel engines. Propulsion plants were compared in terms of plant efficiency, reliability and environmental. The shipyard’s order book and the active fleet of LNG carriers with a capacity above 65000 m3 were analyzed.