Dual Fuel Marine Diesel Engine Selection And ER Layout Feasibility Analysis

With the steady development of LNG shipping technology, LNG ship’s propulsion system is also by a conventional steam turbine propulsion system developed to dual fuel diesel electric drive powertrain, combined with stringent emissions regulations limit low pollution dual fuel medium-speed diesel engines and more by the owner of all ages.In the liquefied natural gas (LNG) ship, the use of dual fuel medium-speed diesel electric drive powertrain greater benefit not only to meet the emission requirements for the transport process, carrying liquefied natural gas will continue to produce goods vapor (Boil off Gas, referred BOG), evaporation rate of about0.1%to0.15%, how to handle these vapors to dual fuel medium-speed diesel electric drive powertrain in the LNG transport ship emerged.Dual-fuel medium-speed diesel-electric drive system as the new propulsion system has many technical features and application difficulties, is an integrated research and development need to focus on the content. Compared with conventional LNG ships used steam propulsion system, dual-fuel diesel-electric drive system applied to dual-fuel medium-speed diesel engines, AC motor driven through a reduction gear box, shaft and propeller propulsion device constituted. With inverter control propulsion control system as the core, dedicated gas combustion unit (GCU) and a lot of gas temperature and pressure measurement and control instrumentation and components, quality assurance gas handling equipment, double tubes and other special parts, equipment and components for these functions and performance is different from the conventional tankers, but also different from the conventional LNG carriers, so how will the special equipment and components integrated into a unified and coordinated propulsion system, power plant systems to ensure reliable, safe and economic operation is a major research paper target.In this paper,150,000m3LNG carrier level relying around the dual-fuel medium-speed diesel engine auxiliary systems integration and development, integrated development equipment chosen&engine room arrangement, etc. to carry out related research, the formation of dual-fuel diesel electric drive power system application integration solutions.(1) dual-fuel medium-speed diesel engine auxiliary systems integration research:focus on systems integration will focus on natural gas supply, exhaust systems integration, systems integration and excess oil combustion of natural gas handling system integration research, the formation of each system design.(2) Integration of Equipment Chosen&Engine Room Arrangement:Through research, understand the dual-fuel medium-speed diesel electric drive powertrain configurations, the choice of major equipment inside the cabin, master layout principles and major equipment layout and integrated propulsion shafting design, considering the professional layout features, the completion of150,000m3LNG carrier class cabin layout scheme.