Author(s): David Emberson, Associate Professor NTNU Department of Marine Technology
Date: 12.05.2023

WEBINAR: Emissions formation in combustion engines

Smart Maritime WEBINAR on Emissions formation in combustion engines.

Friday May 12, 2023


The marine sector relies on the use heavy duty, compression ignition (Diesel) internal combustion engines, burning fossil derived fuels (marine diesel, heavy fuel oil, diesel fuel, natural gas). They produce emissions that can have negative impacts on human health and the environment. Two of the most significant pollutants emitted by these engines are nitrogen oxides (NOx) and soot, or particulate matter (PM).

NOx is formed when nitrogen and oxygen in the air react at high temperatures and pressures in the engine's combustion chamber. Soot is the result of incomplete combustion of fuel,. Both NOx and soot can contribute to smog and poor air quality, and they have been linked to respiratory problems and other health issues. Reducing these emissions from internal combustion engines is an important goal for improving air quality and mitigating the impacts of climate change.

This webinar will introduce the basics of how these are emissions are formed inside the combustion chamber of a diesel engine.


  • What are the emissions of concern
  • Recap of combustion reaction
  • Emission in Diesel engine
    • Carbon monoxide
    • Nitrogen oxides
    • Soot/PM
    • Unburnt Hydro-Carbons
  • Control of emission formation (mainly NOx)




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