This section is available on request - MAN Diesel & Turbo
This section is available on request - MAN Diesel & Turbo
This section is available on request - MAN Diesel & Turbo
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<strong>MAN</strong> B&W 7.00<br />
Gas System<br />
In order to make it possible to use the Boil Off<br />
Gas from an LNG Carrier as fuel in low speed<br />
diesels as well, <strong>MAN</strong> B&W has readdressed th<str<strong>on</strong>g>is</str<strong>on</strong>g><br />
technology based <strong>on</strong> our ME engine c<strong>on</strong>cept.<br />
The benefits of the greater c<strong>on</strong>trol given tanks to<br />
the ME engine range further enhance the operati<strong>on</strong>al<br />
reas<strong>on</strong>s for introducing th<str<strong>on</strong>g>is</str<strong>on</strong>g> opti<strong>on</strong>.<br />
Some years ago, <strong>MAN</strong> B&W developed the MC<br />
range of engines for dual fuel. These were designated<br />
MC�GI (Gas Injecti<strong>on</strong>). The combusti<strong>on</strong><br />
cycle was initiated by the injecti<strong>on</strong> of pilot fuel<br />
oil, followed by the main gas injecti<strong>on</strong>. The fuel<br />
injecti<strong>on</strong> timing <strong>on</strong> these dual fuel engines was<br />
mechanically c<strong>on</strong>trolled, but in the electr<strong>on</strong>ically<br />
Internal and external systems for dual fuel operati<strong>on</strong><br />
Scav. air receiver<br />
Gas system <strong>on</strong><br />
the engine<br />
(Each cylinder)<br />
Cylinder cover<br />
Fuel oil<br />
pressure<br />
booster<br />
P<br />
CMS<br />
Exhaust receiver<br />
T<br />
Pilot oil<br />
Fuel<br />
Fuel<br />
valve<br />
Sealing oil<br />
valve<br />
Gas<br />
valve<br />
C<strong>on</strong>trol<br />
oil<br />
Gas<br />
valve<br />
V3<br />
V4<br />
ACCU<br />
V5<br />
Valve block<br />
ELGI FIVA<br />
Fig. 7.00.01: �GI engine and gas handling units<br />
P<br />
P<br />
C<strong>on</strong>trol oil / servo oil<br />
Sealing oil system<br />
(Could be outside engine room)<br />
V8<br />
P P<br />
Ventilating system for the engine<br />
Venting<br />
air intake<br />
T S<br />
Air flow switch<br />
Page 1 of 4<br />
c<strong>on</strong>trolled versi<strong>on</strong>, like all ME engines, it can be<br />
user�defined and <str<strong>on</strong>g>is</str<strong>on</strong>g> subject to greater c<strong>on</strong>trol and<br />
flexibility, thereby allowing the dual fuel c<strong>on</strong>cept to<br />
be further optim<str<strong>on</strong>g>is</str<strong>on</strong>g>ed.<br />
The efficiency of �GI dual fuel engines <str<strong>on</strong>g>is</str<strong>on</strong>g> the same<br />
as for ordinary ME engines, owing to the diesel<br />
cycle. The system efficiency will be higher than<br />
that of other gas c<strong>on</strong>suming propulsi<strong>on</strong> systems,<br />
incl. the dual fuel diesel electric even when c<strong>on</strong>sidering<br />
the compressor power.<br />
Full redundancy as required by the Internati<strong>on</strong>al<br />
Associati<strong>on</strong> of Classificati<strong>on</strong> Societies’ (IACS) can<br />
be met with <strong>on</strong>e compressor package with either<br />
<strong>on</strong>e reliquefacti<strong>on</strong> unit or <strong>on</strong>e oxidizer as back�up.<br />
The system c<strong>on</strong>figurati<strong>on</strong> <str<strong>on</strong>g>is</str<strong>on</strong>g> shown in Fig. 7.00.01.<br />
Legend<br />
Double wall pipe<br />
Gas pipe<br />
C<strong>on</strong>trol oil/<br />
servo oil pipe<br />
Air flow directi<strong>on</strong><br />
Gas flow directi<strong>on</strong><br />
PT Pressure sensor<br />
TE, TC Temperature sensor<br />
FS Switch<br />
V1, V2 Valve<br />
K1, K2 Relay<br />
CMS Cylinder M<strong>on</strong>itoring System<br />
ACCU Gas accumulator<br />
Engine room Outside<br />
Pump<br />
unit<br />
K2 Gas supply system<br />
Sucti<strong>on</strong> fan for<br />
double pipe system<br />
V2<br />
P P<br />
V7<br />
V1<br />
Gas<br />
compressor<br />
K3<br />
178 52 96�2.1<br />
<strong>MAN</strong> B&W ME/ME-C/ME-B/-GI 198 48 84-6.2<br />
<strong>MAN</strong> <strong>Diesel</strong><br />
K1<br />
HC<br />
HC HC�sensors<br />
V6<br />
Silencer<br />
CT<br />
Inert gas<br />
P<br />
Inert gas<br />
delivering<br />
K4 unit<br />
Inert gas system<br />
Silencer
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