The Power2® performance package
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Technical information The Power2® performance package NOx down, power up, fuel down Power and productivity for a better world™

Power2 two-stage turbocharging Leading edge technology for large engine turbochargers. Driven by engine builders’ demands for ever lower levels of harmful emissions and greenhouse gases combined with ever higher levels of power density and fuel efficiency, Power2 takes turbocharger performance into a new range.

Power2 is capable of producing pressure ratios up to 12, compared with up to 6 for the best single-stage turbochargers. Emissions imperative The launch of Power2 two-stage turbocharging comes as the large engine industry gears up for its greatest emissions challenges. A major focus is limitations on oxides of nitrogen (NO x ) due in the middle of this decade. They demand reductions as severe as 80 to 90 percent compared with the IMO Tier I requirements. At the same time, governments all round the world have committed themselves to reducing greenhouse gas emissions, including carbon dioxide...

Enabling Miller Miller Cycle versus the NOx-SFC trade-off. Taming the trade-off Power2 two-stage turbocharging is set to be a major factor in tackling one of the dilemmas of engine emissions reduction – the trade-off between NOx formation and specific fuel consumption (SFC). The “NOx-SFC trade-off” reflects the fact that NOx formation decreases with lower combustion temperatures while fuel efficiency increases with higher combustion temperatures. On diesel engines, a widespread measure has been to reduce combustion temperatures and hence NOx formation by fuel injection rate shaping. Thus, a...

How it works The Power2 two-stage turbocharging principle. Intercooling between the two compressor stages reduces the temperature and the volume of the air after the first stage turbocharger which allows the second stage turbocharger to be smaller, making the total system more compact. This arrangement readily produces the high turbocharging pressure ratios needed to create very strong Miller Cycles on four-stroke medium-speed diesel engines. Courtesy Wärtsilä Corporation Achieving the 80 percent NOx reduction required by IMO Tier III compliance in ECAs without aftertreatment would reduce...

Engine control with Power2 Air management. To adapt charge air output to demand from the engine under a full range of load and speed conditions, Power2 two-stage turbocharging can be used with familiar turbocharger control options. Their control organs can be integrated into overriding electronic engine and powertrain management systems. Advanced control for Variable Miller Cycles The strong Miller Cycles which Power2 can enable assume an engine operating at its best point for power and / or fuel consumption and /or emissions, i. e. its maximum continuous rating or “MCR”. However, in many...

ABB Turbocharging A unique partner for advanced engine components. Power2 two-stage turbocharging is a major part of ABB Turbocharging’s growing portfolio of products and services for engine builders and engine end users. They share the common theme of optimizing the performance, economy, reliability, availability, life cycle costs and not least the exhaust emissions of diesel and gas engines – and hence ships, power plants, mobile equipment and locomotives fitted with ABB turbochargers. Proactive solutions For ABB Turbocharging this means proactively addressing the needs and concerns of...

Complementary technologies Power2 is one of two complementary building blocks ABB Turbocharging can offer engine builders as a unique partner to address what are presently their major concerns: – Compliance with the strict limitations on emissions of oxides of nitrogen (NOx ) from engines on land and at sea due to be implemented in the middle of the present decade – Increasing fuel efficiency in the face of the steady rise in the price of fossil fuels and international agreements governing emission of the greenhouse gas carbon dioxide (CO2 ) Power2 and VCM interaction Meshing perfectly with...

Courtesy Dresser Waukesha Emissions compliance IMO Tier III and EPA Tier 4 are typical of the emissions legislation to be enacted in the middle of the present decade affecting engines with outputs over 500 kW. Tier III, from 1 January 2016 IMO Tier III The third stage of marine engine emissions legislation issued by the International Maritime Organisation and due in 2016 builds on IMO Tier II. In 2016 the generally applicable 20 percent reduction in NOx emissions vis-à-vis IMO Tier I (introduced 2000) continues to govern NOx emissions on the high seas. However, IMO Tier III demands an 80...

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