Post on 03-Feb-2016
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Diesel Exhaust Emissions
PM and NOx After treatment
Terminology TECHNICAL TERM CUSTOMER TERM OTHER COMMON TERMS
Aftertreatment System Exhaust Filter System Aftertreatment SystemExhaust Filter•Diesel Oxidation Catalyst (DOC)•Diesel Particulate Filter (DPF)
Exhaust Filter•Diesel Oxidation Catalyst (DOC)•Diesel Particulate Filter (DPF)
Aftertreatment Device (ATD)•Diesel Oxidation Catalyst (DOC)•Diesel Particulate Filter (DPF)
Regeneration•Passive•Active (Auto)•Parked (Manual)•Service
Exhaust Filter Cleaning•Natural•Auto•Manual•Service
Regeneration•Passive•Active (Auto)•Parked (Manual)•DPF Recovery
Fuel Dosing System Fuel Dosing System Hydrocarbon Dosing System
Particulate Matter (PM) Soot Soot Particulate Matter
Ash Ash Ash
Ash Removal Ash Removal Ash Cleaning
Diesel Emissions Controls Today, viable emission control technologies exist to reduce exhaust emissionsfrom 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)
Diesel Oxidation Catalyst
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
Diesel Particulate Filter Sintered Metal or Wire Mesh
Diesel Particulate Filter Wall-flow Monolithic Substrate
Wall Flow DPF
DOC / DPF
Diesel EGR
LOW pressure EGR With DPF
2010 On-Highway
2010 SCR w/ DEF system