Increasing efficiency of modern turbochargers means that there is a portion of unused exhaust energy available. MAN Diesel & TurboTurbo Compound System Power Turbine and Generator (TCS-PTG) makes use of that excess exhaust energy. 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 . 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. [More]