L+V51/60DF - MAN Diesel & Turbo - 首页
L+V51/60DF - MAN Diesel & Turbo - 首页
L+V51/60DF - MAN Diesel & Turbo - 首页
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Gaseous fuels<br />
On natural gas, the 51/<strong>60DF</strong> undercuts IMO Tier II<br />
levels by extremely wide margin – indeed, in gaseous<br />
fuel mode, the 51/<strong>60DF</strong> already fulfils the strict IMO<br />
Tier III NOx limitations prescribed for Emissions Control<br />
Zones (ECA’s).<br />
Micropilot ignition<br />
Building on this firm basis for low emissions, the<br />
51/<strong>60DF</strong> employs the latest “micropilot” gas ignition<br />
technology. The gaseous fuel is ignited by injection of a<br />
distillate fuel pilot representing less than 1% of the<br />
quantity of liquid fuel needed to achieve the 51/<strong>60DF</strong>’s<br />
full rated output in its liquid fuel back-up mode.<br />
Liquid fuels<br />
The 51/<strong>60DF</strong> complies with IMO Tier II NOx emissions<br />
limits operating on either distillate (MDO) or heavy fuel<br />
oils (HFO).<br />
RI – Retarded injection<br />
Retarded injection timing delays combustion heat<br />
release and thus lowers combustion chamber temperature<br />
peaks.<br />
Common rail pilot-fuel injection<br />
The 51/<strong>60DF</strong> pilot injection system uses the latest <strong>MAN</strong><br />
<strong>Diesel</strong> common rail technology which allows flexible<br />
setting of injection timing, duration and pressure for<br />
each cylinder. This flexibility allows the fuel consumption<br />
and emissions of the 51/<strong>60DF</strong> to be optimised at any<br />
point on its operating profile. In gaseous fuel mode<br />
<strong>MAN</strong> <strong>Diesel</strong> common rail technology also allows the<br />
gas admission and pilot injection of the 51/<strong>60DF</strong> to be<br />
very closely matched to power demand, even down<br />
to very low engine loads, e.g. when meeting only the<br />
vessel’s hotel load. Likewise, <strong>MAN</strong> <strong>Diesel</strong> common rail<br />
technology also allows the 51/<strong>60DF</strong> to respond rapidly<br />
to combustion knocking and misfiring on a cylinder-bycylinder<br />
basis.<br />
ICC – Intrinsically clean combustion<br />
The 51/<strong>60DF</strong> is designed to burn methane and gases<br />
with high methane content. As the simplest compound<br />
of carbon and hydrogen in the hydrocarbon series,<br />
methane is essentially clean burning.<br />
51/<strong>60DF</strong> – Four-Stroke dual-fuel engine 5
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