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waste heat recovery


Market pressures strengthen case for WHR


control flaps power turbine


+ control cabinet + software


gear box coupling generator


An MAN Diesel & Turbo TCS-PTG waste heat recovery system: some main engine exhaust gas is diverted to drive turbine generators O


rders from China’s Samjin Shipbuilding will see the first marine applications of MAN Diesel & Turbo’s new generation


Turbo Compound system incorporating a power turbine-generator (TCS-PTG). The systems will serve the six-cylinder MAN B&W S80ME-C9.2 low speed main engines of two 4,700 TEU container ships building for the German owner Horst Zeppenfeld. An option is held for two sisterships.


Applications of the new TCS-PTG system have hitherto benefited stationary power generating plants in London and Panama. The debut marine installations will embrace 2 + 2 TCS-PTG20 sets from MAN Diesel & Turbo, which will also supply 2 + 2 TCA88 turbochargers for the engines. The deliveries are due to start by end-2012. Specifying a TCS-PTG unit aims to cut fuel costs as well as reduce the running costs of the diesel gensets as these can be operated on part- load when the TCS-PTG takes over. At sea, if no refrigerated containers are being carried, the


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Fuel prices and tightening emission controls have increased shipowner interest in new generation waste heat recovery systems based on power gas turbines


by Doug Woodyard


unit’s output may even enable a genset to be completely shut down. In many cases, a TCS- PTG also allows an operator to minimise the installed diesel genset power and reduce initial investment costs. Growing potential for waste heat recovery (WHR) systems based on a TCS-PTG is foreseen by MAN Diesel & Turbo, which reports that up to five per cent of the energy from the main engine exhaust gases can be recovered. As an alternative, the German group offers an STG (steam turbine and generator) system that


recovers energy from an exhaust gas boiler for driving a steam turbo-alternator set. A more comprehensive solution – the MARC_


HRSTM system – combines an STG with a TCS- PTG to recover up to 10 per cent of the energy from a main engine’s waste heat.


In the above systems the power gas turbine is placed in parallel with the main engine turbochargers and/or steam turbine to exploit heat from the exhaust gas after the turbochargers.


All MAN B&W ME and MC low speed engines in the MAN Diesel & Turbo portfolio are suitable for association with a WHR system; the larger the engine output, the greater the potential offered by WHR. Such systems have thus traditionally been applied in large container ships and land-based power stations. Installing a WHR system on a container ship calls for a larger exhaust piping system to ensure an even gas distribution within the exhaust boiler. The boiler itself requires a collector to


Marine Propulsion I February/March 2012 I 93


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