ABB Turbocharging has announced the first application on a marine engine of its Power2 800-M second generation two-stage turbocharger.
The new multi-fuel capable Wärtsilä 31 marine engine, also announced this week at the Nor-Shipping 2015 exhibition in Oslo, is equipped with the Power2 800-M.
The company says the latest generation of Power2 800-M is designed to allow fuel flexibility as it is suitable for engines burning all marine fuel types.
The two-stage turbocharger model has increased pressure ratio capabilities up to 12, from eight in the first generation, and the turbocharger efficiency is beyond 75%. A single-stage turbocharger is typically around 65-70%.
The combination of higher efficiency and a higher pressure ratio increases the engine’s power density, according to ABB, and adds to significant potential savings on fuel consumption and up to 60% lower NOx emissions.
“New marine engine technology needs to offer consistency of performance across conventional and newer marine fuel options, demanding turbochargers that can work with highest pressure ratios in combination with highest efficiencies to minimize fuel consumption,” said Christoph Rofka, Senior General Manager – Products at ABB Turbocharging.
“Power2 800-M second generation has been developed from scratch with the two turbochargers working seamlessly together to extract a higher percentage of residual energy from the exhaust gases,” he said.
The increased pressure ratios and turbocharging efficiencies support engine concepts enabling “six figure savings” on fuel annually, he added.
This second generation of Power2 800-M is also over 20% more compact than conventional two-stage units. It was also designed with high availability and minimum downtime in mind being both easier to accommodate on the engine and, significantly for operators, it enables fast servicing in limited spaces due to the ‘extractable cartridge’ concept. This allows turbocharger overhauls without touching any engine connections, resulting in a significant reduction in servicing time.
ABB Turbocharging’s first generation of Power2 is already used on power plant applications. The second generation is targeted at four-stroke marine engines operating in a wide range of load profiles while helping to meeting emissions requirements.
The technology was developed and is scheduled for production at ABB Turbocharging headquarters in Baden, Switzerland.