MAN B&W 4.05
Page 2 of 9
MAN Diesel
MAN B&W 98-60 engines
198 57 97-7.5
Exhaust gas
To funnel
TCS-PTG
Frequency converter
Main
switchboard
GenSet
GenSet
Piping
Electrical wiring
Exhaust gas receiver
Main engine
Scavenge
air cooler
TC TC
PTO/
PTI
Power
turbine
~/~ OO
Steam
boiler
Steam for
heating
services
178 63 80-5.0
Fig. 4.05.01: PTG diagram
Power Turbine Generator (PTG)
The power turbines of today are based on the dif-
ferent turbocharger suppliers’ newest designs of
high efficiency turbochargers, i.e. MAN TCA, ABB
A-L and Mitsubishi MET turbochargers.
MAN Diesel & Turbo offers PTG solutions called
TCS-PTG in the range from approx. 1,000 kW to
5,000 kW, see Fig. 4.05.02.
The power turbine basically is the turbine side of
a normal high-efficient turbocharger with some
modifications to the bearings and the turbine
shaft. This is in order to be able to connect it to
a gearbox instead of the normal connection to
the compressor side. The power turbine will be
installed on a separate exhaust gas pipe from the
exhaust gas receiver, which bypasses the turbo-
chargers.
The performance of the PTG and the main engine
will depend on a careful matching of the engine
turbochargers and the power turbine, for which
reason the turbocharger/s and the power turbine
need to be from the same manufacturer. In Fig.
4.05.01, a diagram of the PTG arrangement is
shown.
The newest generation of high efficiency turbo-
chargers allows bypassing of some of the main
engine exhaust gas, thereby creating a new bal-
ance of the air flow through the engine. In this
way, it is possible to extract power from the power
turbine equivalent to 3.5% of the main engine’s
SMCR, when the engine is running at SMCR.
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