Peter Brotherhood, the UK company specialising in the design and manufacture of steam turbines, has delivered six 6 MW turbo-compound systems to Odense Steel Shipyard in Denmark, for waste heat recovery systems. Each turbo-compound system will be installed on-board a large container ship. They will be used to convert energy in the exhaust gases from the main propulsion, slow speed diesel engine into electrical power for use on-board the ship.
The turbo-compound system consists of a 5.25 MW Peter Brotherhood steam turbine, a 2.25 MW Mitsubishi power turbine, two gearboxes and a 6 MW Siemens generator - all on a combined baseframe. An electronic governor and PLC based control system has also been supplied to regulate the start up, shut down and running modes over the full range of the main engine duties. The turbo-compound systems have proved to be the right choice of equipment due to the relatively short pay back period and the efficiency of the system. In most cases, the system generates significant savings in the fuel consumption of the main engine, depending on the operating regime of the ship. Reduction of emissions is also expected in terms of both NOx, SOx and CO2 from the exhaust of the main engine to atmosphere via the ship's stack.