Samjin Shipbuilding in Weihai, China, has ordered two Turbo Compound Systems including Power Turbine and Generator (TCS-PTG) with MAN Diesel & Turbo. It is the first such instance for a marine application for the new generation of TCS-PTG after previous applications at stationary power plants in London and Panama.
The TCS-PTGs will be employed aboard two 4700 teu container vessels currently under construction, operated by German shipowner Reederei Horst Zeppenfeld, each powered by individual MAN B&W 6S80ME-C9.2 low-speed engines. The order includes an option for two extra vessels. The company will also supply 2 + 2 × TCA88 turbochargers at a total project volume of some 4 million euro. Delivery is scheduled to begin by the end of 2012.
Fuel and Cost Savings
The TCS-PTG units should save fuel and reduce the operating costs of the gensets as these can be run on part-load when the TCS-PTG unit takes over. During sea passage, if no reefer containers are carried, the TCS-PTG may even fully replace a genset. In many cases, the installation of a TCS-PTG unit also allows the user to minimise the installed genset power output and to reduce corresponding investment costs accordingly.
Waste-Heat-Recovery
The TCS-PTG is a waste-heat-recovery systems, which can recover up to five per cent of the energy from a main-engine’s exhaust gases. As an alternative, the company offers an STG (Steam Turbine and Generator) system that recovers energy from an exhaust-gas steam boiler. MAN Diesel & Turbo also offers the MARC_HRSTM system, which is a combination of STG and TCS-PTG that recovers up to ten per cent of the energy from a main-engine’s waste heat.
Picture: MAN Diesel & Turbo’s TCS-PTG system
