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Gas engine makes successful debut
Friday, 25 Jan 2013
MAN Diesel & Turbo recently showcased its new rangeof gas
engines and turbines at its Augsburg facility,including the 35/44G
engine, the latest addition to itsfour-stroke power portfolio.
The 20V35/44G engine on the MAN Diesel & Turbo test bed in
Augsburg, Germany
The newly developed Otto gas engine has an electrical
efficiency of 47.2%, and is available for combined heatand power
(CHP) and/or jointly with an MAN steamturbine of the MARC
series.
It features a single-stage turbocharger with variableturbine
area (VTA) technology and many innovativetechnological elements,
the engine manufacturer said.
The spark-ignited unit, which is said to be ideal forcombined
cycle and combined-heat and powerconfiguration with waste-heat
utilisation, has beendeveloped to comply with all current emission
limitssolely by in-engine measures.
http://www.shipandoffshore.net/index.php?eID=tx_cms_showpic&file=uploads/pics/MAN44G-3.jpg&md5=7140623ef5cbf00e00debeaa90fcf3d28e987221¶meters[0]=YTo0OntzOjU6IndpZHRoIjtzOjQ6IjgwMG0iO3M6NjoiaGVpZ2h0IjtzOjM6IjYw¶meters[1]=MCI7czo3OiJib2R5VGFnIjtzOjQyOiI8Ym9keSBiZ0NvbG9yPSIjZmZmZmZmIiBz¶meters[2]=dHlsZT0ibWFyZ2luOjA7Ij4iO3M6NDoid3JhcCI7czozNzoiPGEgaHJlZj0iamF2¶meters[3]=YXNjcmlwdDpjbG9zZSgpOyI+IHwgPC9hPiI7fQ==
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Power density
The 35/44G is offered in a V-type version with 20cylinders and
an output of 10,600 kW (10,200 kW). Its
rated outputs 530 kW per cylinder for 50 Hz power
generation and 510 kW for 60 Hz power generation give the 35/44G
best-in-class power density amonggas engines, MAN noted.
Fuel
In addition to a high supply reliability and the potentialfor
savings in terms of operating and procurementcosts, the advantage
of gas-fired power plants lies in
extremely low emissions coupled with a high level ofefficiency.
Due to the lower carbon content of the fuel,gas engines emit around
25% less CO2 than dieselengines. NOx emissions are roughly 80%
lower, while
emissions of SOx, soot, and particles are virtually
non-existent.Lean-burn concept
In a lean-burn gas engine, the mixture of air and gas inthe
cylinder is lean, that is, more air is present in thecylinder than
is needed for complete combustion. With
leaner combustion, the peak temperature is reduced
and less NOx is produced, MAN said. Higher output canbe reached
while avoiding knocking and increasing
efficiency.Advanced ignition technology
The ignition system comprises a capacitive dischargesystem and
an ignition coil, which delivers thenecessary high voltage via an
ignition lead to the spark
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plug. To improve combustion, the spark plug is locatedin the
pre-chamber.
Gas is precisely metered to the pre-chamber by means
of a separate valve. In conjunction with the leanmixture from
the main chamber, which is fed into thepre-chamber by the
compression cycle, this creates ahighly efficient, almost
stoichiometric mixture. This is
ignited using the spark plug, providing an ignitionamplifier for
the main chamber.
Safety and control system
The 35/44G engine is equipped with the safety andcontrol system
SaCoSone, which guarantees reliable
engine operation with an optimum operation rangebetween knocking
and misfiring. All cylinders areregulated individually.
Cogeneration or combined cycle
In addition to using thermal energy recovered fromengine sources
for heating or cooling in cogeneration or
tri-generation applications, the exhaust heat of the35/44G
engine can be used to produce steam to drivea steam turbine
generator. As a result, the overalloutput and efficiency of the
power plant can beincreased without additional fuel costs.
