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Diesel Exhaust Emissions

Diesel Exhaust Emissions . PM and NOx After treatment . Terminology . Diesel Emissions Controls . Today, viable emission control technologies exist to reduce exhaust emissions from existing diesel vehicles. Retrofit technologies designed to control particulate matter (PM) include:

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Diesel Exhaust Emissions

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  1. Diesel Exhaust Emissions PM and NOx After treatment

  2. Terminology

  3. Diesel Emissions Controls • Today, viable emission control technologies exist to reduce exhaust emissions • from existing diesel vehicles. • Retrofit technologies designed to control particulate matter (PM) include: • • Diesel oxidation catalysts (DOCs) • • Diesel particulate filters (DPFs) • • Flow through filters (FTFs) • • Closed crankcase ventilation (CCV) • Retrofit technologies designed to control oxides of nitrogen (NOx) include: • • Exhaust gas recirculation (EGR) • • Selective catalytic reduction (SCR) • • Lean NOx catalysts (LNCs or HC-SCR) • • Lean NOx traps (LNTs)

  4. Diesel Oxidation Catalyst

  5. Diesel Oxidation Catalyst • Like catalytic converters already used on all gasoline vehicles, diesel oxidation catalysts (DOCs) cause chemical reactions to reduce emissions without any moving parts. • The catalysts reduce particle emissions by as much as 50%, can reduce visible smoke, and eliminate the odor of diesel exhaust. • The catalysts can reduce the invisible ozone forming hydro-carbon gases by more than 70% and CO by up to 90% • DOCs are used in new vehicles and can be installed on retrofitted vehicles already in use. • Can be used with D2, biodiesel, emulsified diesel, ethanol/diesel blends and other alternative diesel fuels • Usually not a Level 3 device

  6. Diesel Particulate Filter Sintered Metal or Wire Mesh

  7. Diesel Particulate Filter Wall-flow Monolithic Substrate

  8. Wall Flow DPF

  9. DOC / DPF

  10. Diesel EGR

  11. LOW pressure EGR With DPF

  12. 2010 On-Highway

  13. 2010 SCR w/ DEF system

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