Marine engines are a large scale emitter of oxides of sulphur, soot and other particulate matter. The International Maritime Organization thus prescribed reductions of the exhaust gas threshold levels in stages. Combustion measures and exhaust aftertreatment are required to fulfill the future legislation. To fulfill future emissions legislation, Bosch is developing a 2200 bar common rail system for marine engines. Marine engines can be segmented into the following categories: derivatives of heavy duty truck engines, high-speed engines, medium-speed diesel and heavy fuel engines, low-speed heavy fuel engines. For heavy duty truck derivative marine engines Bosch offers the CRSN3 common rail system, based on commercial vehicle components. For high-speed engines Bosch offers the robust modular common rail system, MCRS. The MCRS-T for medium speed diesel engines with long service intervals has gone into series production in 2011. The MCRS has been developed for high-speed engines with unitary outputs above 120 kW/cylinder and has been adapted to meet the needs of marine engines. The layout of the MCRS is shown in the paper. The challenges for common rail systems in marine applications due to the regional variation in fuel quality are outlined. For medium-speed engines, the MCRS-16T has been developed for engine categories up to 500 kW/cylinder. MCRS-22 offers maximum fuel pressures up to 2200 bar and is being developed for IMO Tier III and EPA Tier 4 emission limits. The characteristic values of the high-pressure injector and key points of injector design and the high-pressure injection pump as well as pump design are outlined. The common rail system for HFO applications to fulfill IMO Tier II emissions regulations and reduce PM emissions CRS Gen 1 is presented. The MCRS-22-HFO combining the advantages of the CRS-HFO Gen 1 with the MCRS-22 for diesel fuelled engines is discussed.
Injection technology for marine diesel engines
Motortechnische Zeitschrift ; 73 , Sonderheft: industrial ; 44-48
2012
5 Seiten, 6 Bilder, 4 Quellen
Article (Journal)
German
INJECTION TECHNOLOGY FOR MARINE DIESEL ENGINES
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