Heavy-duty designs on aftertreatment

The introduction of stringent EPA 2015 regulations for locomotive/marine engines and IMO 2016 Tier III marine engines precipitated the need to develop large diesel engine aftertreatment systems.

Marine, locomotive, and stationary power generators typically use large diesel engines to deliver the power needed for commercial transportation and electricity generation. These two- or four-stroke engines occupy large spaces and deliver power ratings that range from 800 to 4900 hp (600 to 3650 kW).

Engine emissions are composed of NOx, PM, CO, HC, and SOx, which need to be reduced according to regulations and local municipal rules. In particular, U.S. EPA 2015 introduced stringent rules for NOx, PM, CO, and HC reductions; IMO 2016 Tier III introduced similar rules for NOx and SOx emissions.