Power Turbine Generator for Marine Applications

By Keith Henderson at December 20, 2011 12:52
Filed Under: Company News

MAN Diesel & Turbo energy saving combination of high efficiency turbochargers with power turbine generators has already been in use in shore based powergen applications. In a recent announcement, shipping line Reederei Horst Zeppenfeld, Germany has ordered this system in its first marine application. It will be installed in two 4,700 TEU container ships presently building by Samjin Shipbuilding, Weihai, Shandong, China. The vessels, scheduled for delivery mid 2013,. have a LOA of 823 ft (251 m), and are powered by a single MAN B&W 6S80ME-C9.2 low speed two stroke engine with power output of 27MW.

The increasing efficiency of modern turbochargers means that there is a portion of unused exhaust energy available. The Turbo Compound System Power Turbine and Generator (TCS-PTG) makes use of that excess exhaust energy.

Caption: TCS-PTG schematic showing how exhaust is diverted from
the exhaust gas receiver to the power turbine.
Image Credit: MAN Diesel & Turbo SE

The system diverts excess exhaust, up to 13 per cent of exhaust gas flow, from the exhaust gas receiver to a power turbine that is inserted parallel to the turbochargers. The turbo performance and main engine output is not affected by the use of the PTG which can extract up to five per cent of additional power with a maximum of 4,700 kW, depending on the size of the main engine.

The power turbine drives a generator via a reduction gearbox that produces electrical energy at 50 or 60 Hz . Depending on the ship’s energy requirements, the PTG can supplement or replace onboard auxiliary gensets.

MAN Diesel & Turbo recommend the TCS-PTG system for marine applications with main engines above 20 MW and where the electrical power requirement in more than ten per cent of main engine power. A payback period for the system can be as short as 3 to 5 years, depending on usage and of course fuel prices.


Caption: Individual parts of the PTG. The system can extract up to five per cent of additional power
with a maximum of 4,700 kW, depending on the size of the main engine.
Image Credit: MAN Diesel & Turbo SE

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