Rolls-Royce Power Systems is installing the first of its new MTU Tier 4 natural gas engines on a tug being built for Svitzer this year. Rolls-Royce is working with Dutch shipbuilder Damen Shipyards Group on the gas-fuelled tug project. This will feature a 16-cylinder compressed natural gas (CNG) engine, part of the MTU Series 16V 4000 range.
The engine will be equipped with a multi-point gas injection system, a dynamic motor management system and an advanced turbocharger. The multi-point injection system is designed to provide dynamic acceleration behaviour, increased levels of performance and reduced emissions. Controlled combustion ensures that the CNG fuel is used in a highly efficient way.
There will be additional safety features, including double-walled gas supply lines, to cover the use of CNG as a fuel. This MTU gas engine will deliver 2,000kW with a high power density for high levels of bollard pull.
MTU’s gas engine has successfully completed 3,000 hours on the test bench at the company’s factory in Friedrichshafen, Germany. According to MTU it has been possible, using the test bench, to simulate real-life manoeuvres which have mirrored the dynamic acceleration rates of a diesel engine.
The MTU Series 4000 M05-N pure gas engines will range from 746kW to 2,000kW producing 1,000 to 2,682 bhp. The eight-valve version will have a power range of 746kW to 1,000kW to generate horsepower of 1,000 to 1,340 bhp with a rated speed of 1,600 to 1,800 rpm. The 16-valve version will have a similar speed rating, but will produce 2,000 to 2,682 bhp.
Any installation of an M05-N engine will need a gas regulating unit, CNG storage tank and gas-safe machinery. The engines will meet US EPA Tier 4 and the EU’s Euro V for hydrocarbon emissions. MTU said the engine emits almost zero SOx and NOx and 25 per cent less CO2 than equivalent diesel engines. But there is the risk of methane slip as not all of the gas is burned.