EXHAUST AFTERTREATMENT SYSTEM
Precisely controlled quantities of 32.5% DEF solution are injected into the exhaust stream. DEF solution hydrolyzes into ammonia gas which mixes with the exhaust gas.
Exhaust gas from DPF Outlet containing Nitrogen Oxides (NO x )
CAC
DEF TANK
SCR CATALYST
DPF
DOC
DEF DOSER
TAILPIPE
HC DOSER
Ammonia and Nitrogen Oxides react in the Catalyst to form Nitrogen (N 3 ) and water (H 2 O)
ENGINE with EGR
THE EXHAUST AFTER TREATMENT SYSTEM
Post-combustion exhaust gases are treated prior to tailpipe emission in a diesel combustion vehicle Unburned hydro carbons (or unburned diesel) is trapped by the Diesel Particulate Filter ( DPF ) and burned with the aid of the Diesel Oxidation Catalyst ( DOC ) When used in conjunction with an Selective Catalytic Reduction Catalyst ( SCR ), the resulting emission is primarily a very friendly mixture of Nitrogen and water in the form of steam
THE REDUCTION PROCESS • The DOC has a metallic or ceramic substrate with channels through which exhaust directly flows • The DPF is usually located past the DOC in the Exhaust After Treatment System (EATS) • The DPF is larger than the DOC, with a ceramic substrate with small channels that are blocked at alternating ends • Exhaust gas flows through the porous walls of the channels, trapping the solid soot particles within the DPF • The DPF is designed to remove particulate matter and soot from the exhaust • DPF S REMOVE UP TO 85% of the soot found in diesel exhaust emissions, reaching greater removal levels when paired with a DOC • Selective Catalytic Reduction (SCR) is an active emissions control technology system that injects a liquid-reductant agent, Diesel Exhaust Fluid (DEF), through a special catalyst into the exhaust stream of a diesel engine
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QUALITY • INNOVATION • DURABILITY
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