Powertrain | Diesel International 2022-09

H2 - FOCUS
#WINDCAT #SCR # D2862 #HVO
Credits: Windcat Workboats
RENEWABLE FUELS
MAN Engines has approved all marine engines from the current
product range for use with renewable diesel fuel in line with the
standard EN15940 in Europe and the US-American specification
ASTM D975 of the American Society for Testing and Materials. This
will allow customers to replace conventional petroleum-based
diesel fuel with “green” or renewable diesel fuel, obtained from
waste and residues of animal and plant origin, cellulosic biomass
such as crop residues, but also hydrotreated vegetable oils (HVO).
Specifically approved for renewable diesel fuel are the MAN
D2862, D2868 and D2676 series with 12, 8 and 6 cylinders, which
are used in yachts and sport fishing boats as well as work boats.
This includes the full MAN marine engine performance range
from 200 to 2,000 HP (147 to 1,471 kW). They are operated in line
with the emission guidelines issued by EPA, IMO and EU. “With
the approval of marine engines for renewable diesel fuel, MAN
Engines is making an important contribution to sustainability,
both in recreational and professional sailing,” stated Claus Benzler,
Head of Marine MAN Engines. In addition, the combustion of
renewable diesel fuel releases approximately 30% fewer particles
and approximately 10% less nitrogen oxide (NOx). “Renewable
diesel fuel ensures cleaner combustion with fewer emissions.
Despite this, there are neither reductions in performance nor
disadvantages with regard to service and maintenance intervals,”
explained Werner Kübler, Head of Engineering MAN Engines.
test bench, very good values of down
to 5% diesel were achieved, but these
increase in real operation. The diesel
injection parameters are optimized in
dual fuel mode to achieve the lowest
emissions and the best consumption
values. Therefore, in dual fuel mode,
considerably less CO 2
is released in
the exhaust gases in circumstances
where operating behavior and
full load characteristics remain unchanged.
In the event of problems
in the hydrogen circuit or a depleted
hydrogen supply, a switch back to
diesel can be made at any time. This
guarantees uninterrupted operation
with normal reliability. Onboard of
the Hydrocat 48 vessel there are three
H2 stillages modularized from CMB.
Tech. Each has a quantity of 69 kg of
hydrogen. Further, there are two die-
sel tanks with 2,900 litres diesel each
(optional 1,900 litres).
Is the engine otherwise the same:
connecting rods, pistons, common
rail and so on?
MAN V12-2000, YACHT APPLICATION
Beside the interfaces to the hydrogen
system (mechanical as well as electrical),
there are no changes to the
engine. The most important modifications
for optimized operation in dual
fuel mode are on the software-side.
Brand
MAN
Model V12-2000
I. D.
B x S mm - S/B 128 x 157 - 1,23
N. cil. - dm 3 12 - 24,24
Maximum power kW - rpm 1470 - 2.300
Mep at max power bar 32,3
Piston speed m/s 12
Maximum torque Nm - rpm 6.497 - 1.200
Mep at max torque bar 34,4
% power at max torque (kW) 34,2
Torque at max power Nm 6.096
% power at max torque (kW) 55,6 (817)
Work range rpm 1.100
What is the efficiency of D28 when
running on hydrogen?
The efficiency is we reduce CO 2
tailpipe
emissions through the use of
hydrogen by an average of approx.
50%, and even up to 80% as a peak
value. Compared to a pure hydrogen
engine, our dual fuel engine ensures
the operation of the ship even in the
case that hydrogen is not available
on the ship or at the refueling infrastructure.
In terms of effective efficiency,
it can be stated that the delta
diesel to hydrogen in the main driving
range is usually