Part-Load Optimisation - Plo - Man L23/30DF Project Manual

MAN Diesel & Turbo
3700499-0.1

Part-load optimisation - PLO

B1100 0
Page 1 (2)
V28/32S, L28/32S, L28/32H, L27/38S, L27/38, L23/30S, L23/30H, L21/31S,
L21/31, L16/24S, L16/24
Description
MAN Diesel & Turbo is continuously adapting our
engine programme to the changing market condi-
tions.
At the request of various shipowners, we have
developed and introduced a new IMO Tier II/III com-
pliant tuning method for GenSets which mostly
operate below the normal 75% MCR.
The new tuning method is referred to as part load
optimisation (PLO), and it is recommended for Gen-
Sets which mostly run below 75% MCR.
Traditionally, GenSets are fuel oil optimised at 85%
MCR, but with PLO tuning, the engine performance
is optimised at approx. 60-65% MCR, which
ensures optimisation in the low-and part-load areas.
The most obvious benefit of applying PLO is the fuel
oil saving of, typically, up to 5 g/kWh, depending on
engine type/model and load point.
Furthermore, thanks to the improved combustion
process resulting from the optimised nozzle ring in
the turbocharger, valuable engine components,
such as pistons, fuel equipment, valves and T/C
nozzle ring, will be operating under optimal condi-
tions at the given load.
The GenSets are fully compliant with IMO Tier II,
even though the fuel oil consumption is reduced in
the low and part load area, as a fuel oil penalty is
imposed in the high load range.
Figure 1: SFOC-curves from first delivery of PLO