Abstract
Globally, emissions legislation for combustion engines is becoming increasingly stringent. With the latest initiatives in the marine and stationary sectors, such as IMO III and EPA Tier 4, demand for exhaust aftertreatment is also growing in the large engine segment, i.e. engines with outputs above 560 kW. Selective Catalytic Reduction (SCR) is a robust and proven method of reliably reducing emissions of oxides of nitrogen (NOx) by wide margins in order to achieve compliance with the stringent limits in force or coming into force. For Tenneco, an established specialist in the design, engineering and manufacture of emissions control systems, including diesel aftertreatment systems for cars, light trucks and onand off-road commercial vehicles, it was a natural evolution to extend the current product range into the large engine segment, based on a newly developed SCR system. The diversity of the technical requirements in the market for engines with outputs above 560 kW is even higher than in the market for off-road machinery and mobile applications where smaller displacement industrial engines are used. It includes two-stroke and fourstroke engines with a wide variety of dif© Xxxxxxx
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