Power Turbine Generator (PTG)
The power turbines of today are based on the dif-
ferent turbocharger suppliers’ newest designs of
high-efciency turbochargers, i.e. MAN Diesel’s
TCA, ABB’s TPL and Mitsubishi’s MA turbocharg-
ers.
The power turbine basically is the turbine side of
a normal high-efcient turbocharger with some
modications 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.
4.05.0, a simple diagram of the PTG arrangement
is shown. The quick-opening and quick-closing
valves are used in the event of a blackout of the
grid, in which case the exhaust gas will bypass
the power turbine.
The newest generation of high-efciency turbo-
chargers allows bypassing of some of the main
engine exhaust gas, thereby creating a new bal-
ance of the air ow through the engine. In this
way, it is possible to extract power from the power
turbine equivalent to 4% of the main engine’s
SMCR, when the engine is running at SMCR.
178 57 09-8.0
Fig. 4.05.01: PTG diagram
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