Ecoexhaust System / Package
Marine DPF and SCR-DPF systems
Combined SCR-DPF systems reducing both particulate matter and NOx from diesel engines, with passive, active or assisted passive DPF regeneration selected to suit the engine and fuel.
Description
Ecoexhaust marine DPF and SCR-DPF systems combine a diesel particulate filter (DPF) with selective catalytic reduction (SCR) to cut both particulate matter (PM) and nitrogen oxides (NOx), helping diesel engines meet stringent regulations such as Stage V. The DPF traps particulates, while the SCR section injects a urea solution (DEF/AdBlue) to convert NOx into nitrogen and water vapour. A mixing pipe and SCR reactor are installed downstream of the DPF.
Design inputs
- Particulate emissions at defined engine operating points
- NOx emissions
- System operating temperature
- Engine duty cycle
DPF regeneration options
- Passive – for engines whose exhaust outlet temperature stays at or above 270 °C over 2 hours of continuous operation and fuel sulphur does not exceed 0.01%; continuous regeneration by NO2 from an upstream oxidation catalyst, no external heat source.
- Active – where fuel sulphur rules out an oxidation catalyst; implemented with electric heaters, mainly on generators.
- Assisted passive – electric heaters raise exhaust temperature to the level needed for passive regeneration.
Applications
Marine diesel engines, including inland vessels.
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