MAN B&W 4.05
Page 4 of 8
MAN Diesel
MAN B&W S80MC6, S80MC-C7/8, S80ME-C7/8/9,
K80MC-C6, K80ME-C6/9
198 57 99-0.2
Steam Turbine Generator (STG)
In most cases the exhaust gas pipe system of
the main engine is equipped with a boiler system.
With this boiler, some of the energy in the exhaust
gas is utilised to produce steam for use on board
the ship.
If the engine is WHR matched, the exhaust gas
temperature will be between 50°C and 65°C
higher than on a conventional engine, which
makes it possible to install a larger boiler system
and, thereby, produce more steam. In short, MAN
Diesel designates this system STG. Fig. 4.05.0
shows an example of the arrangement of STG.
For WHR matching the engine, a bypass is in-
stalled to increase the temperature of the exhaust
gas and improve the boiler output.
The extra steam produced in the boiler can be
utilised in a steam turbine, which can be used to
drive a generator for power production on board
the ship. An STG system could be arranged as
shown in Fig. 4.05.04, where a typical system size
is shown with the outline dimensions.
The steam turbine can either be a single or dual
pressure turbine, depending on the size of the
system. Steam pressure for a single pressure sys-
tem is 7 to 0 bara, and for the dual pressure sys-
tem the high-pressure cycle will be 9 to 0 bara
and the low-pressure cycle will be 4 to 5 bara.
178 56 96-4.0
Fig. 4.05.03: Steam diagram
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