MAN B&W 4.05
Page 4 of 9
MAN Diesel
MAN B&W 98-60 engines
198 57 97-7.5
HPsteam
for heating
services
Condenser
Feedwater
pump
Condensater
pump
LP steam drum
HP steam
drum
HP circ. p.
LP circ. pump
LP evaporator
Piping
Electrical wiring
LP superheater
HP evaporator
HP uperheater
Exhaust gas
STG unit
LP
HP
Exh. gas boiler
sections:
LP
HP
Jacket
water
Hot well
tank
Buffer
tank
Exhaust gas receiver
Main engine
Scavenge
air cooler
TC TC
Vacuum deaerator tank
PTO/
PTI
Steam
turbine
Frequency converter
Main
switchboard
GenSet
GenSet
~/~ OO
178 63 82-9.0
Fig. 4.05.03: STG system diagram
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 & Turbo designates this system STG. Fig.
4.05.03 shows an example of the STG diagram.
For WHR matching the engine, a bypass is in-
stalled to increase the temperature of the exhaust
gas and improve the boiler output. The bypass
valve is controlled by the engine control system.
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. A 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 10 bara, and for the dual pressure sys-
tem the high-pressure cycle will be 9 to 10 bara
and the low-pressure cycle will be 4 to 5 bara.
Steam Turbine Generator (STG)
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