LONDON, 11-Sep-2018 — /EuropaWire/ — Rolls-Royce has today launched its latest in a series of liquefied natural gas (LNG) fuelled marine engines at the SMM maritime exhibition in Hamburg. The Bergen B36:45 model is designed in accordance with the Rolls-Royce philosophy of a common platform for all fuel options and applications, and can be configured to meet the specific engine requirements of customers.
Power output of the LNG-fuelled B36:45 engine is identical to that of the liquid-fuelled B33:45 at 600kW per cylinder at 750 rpm. Specific energy consumption is a low 7300kj/kWh mechanical ISO including two engine driven pumps; specific lubricating oil consumption is less than 0.4g/kWh.
The B36:45 is available in six, eight and nine-cylinder in-line configurations. A V-12 version is now in development, which will be followed by a 20-cylinder V-engine for very high-power applications.
The proven lean-burn Otto cycle combustion B36:45 technology has been developed during Bergen Engines’ extensive experience with LNG-fuelled engines so that methane slip, which contributes to greenhouse gas emissions, has been minimised.
Kjell Harloff, Rolls-Royce Commercial Marine, Senior Vice President – Engines, said: “This new engine builds on the success of the Bergen B35:40-series engine and offers a variety of new benefits to our customers, including rapid response to changes in load and speed, high reliability and clean burning.
“This makes the B36:45 ideally suited for mechanical ship propulsion installations, driving either controllable or fixed-pitch propellers. The engine is equally at home operating at constant speed driving alternators in gas-electric propulsion or auxiliary power generation systems.”
The latest Bergen gas engines are able to achieve up to 22 percent lower Green House Gas (GHG) emissions than the equivalent diesel-fuelled version.
“As most LNG is sulphur-free fuel, sulphur oxides (SOx) and particulate matter emissions are virtually eliminated, while emissions of nitrogen oxide (NOx) are reduced by over 90 percent compared to an equivalent diesel engine. This means that the Bergen B36:45 is able to meet IMO Tier III and EPA Tier 3 emission levels without the need for additional selective catalytic reduction (SCR) systems.
In the case of the new B36:45, the main structural components are the same as those used in the B33:45-series liquid fuel engines. The crankcase, common to all engine types, incorporates all air and oil galleries, minimising external pipework and ensuring stiffness and operational safety. Individual cylinder heads and three-piece connecting rods allow the complete head, liner, piston and upper conrod to be withdrawn for overhaul and replaced, as an assembly, without disturbing the engine bottom end.
Leif-Arne Skarbø, Chief Technology Officer at Rolls-Royce Power Systems, Bergen Engines, added: “Other benefits for end users and shipbuilders arising from this modular approach are that the product is configurable, and production is simplified, resulting in a highly competitive cost per kW and straightforward installation and maintenance.”
For the gas version, different liners, pistons and heads are employed, giving a 30mm increase in cylinder bore compared with the existing, well-proven, liquid-fuelled B33:45. The stroke remains unchanged, at 45cm. Other changes involve the fuel system and injectors, which are Bergen Engines’ own design and make for reliable operation with gaseous fuels. The robust variable valve timing system allows optimum response to load changes, regardless of the grade of fuel.
About Rolls-Royce Holdings plc
- Rolls-Royce pioneers cutting-edge technologies that deliver the cleanest, safest and most competitive solutions to our planet’s vital power needs.
- Rolls-Royce has customers in more than 150 countries, comprising more than 400 airlines and leasing customers, 160 armed forces, 4,000 marine customers including 70 navies, and more than 5,000 power and nuclear customers.
- Annual underlying revenue was £13.8 billion in 2016, around half of which came from the provision of aftermarket services. The firm and announced order book stood at £82.7 billion at the end of June 2017.
- In 2016, Rolls-Royce invested £1.3 billion on research and development. We also support a global network of 31 University Technology Centres, which position Rolls-Royce engineers at the forefront of scientific research.
- Rolls-Royce employs almost 50,000 people in 50 countries. More than 16,500 of these are engineers.
- The Group has a strong commitment to apprentice and graduate recruitment and to further developing employee skills. In 2016 we recruited 274 graduates and 327 apprentices through our worldwide training programmes.
Anette Bonnevie Wollebaek
Communications Manager – Nordic Region
SOURCE: Rolls-Royce plc.