Selective Catalytic Reduction

Selective catalytic reduction (SCR) is the process of converting NOx emissions from oxygen and water vapor after combustion. SCR can deliver near-zero emissions of N pollutant and greenhouse gas, in highway diesel engines. DEFendal’s Diesel Exhaust as a reductant and reacts with the chemical catalyst and the engine heat to convert gases and water vapor. By-products are then released from the tailpipe. It is the mo and fuel-efficient technology because the process occurs after combustion, which a run smoothly. Furthermore, it does not alter the design of the Common Rail Diesel (therefore can continue making fuel durable and economical. SCR technology has ex several years now, when it was used in passenger cars in 2009 and Class 8 trucks in widely utilized in boilers, diesel engines, ships, locomotives, gas turbines, and autom 2010 EPA requirements.

Process:

NOx reduction starts with a CRD engine design that burns Ultra Low Sulfur Design (inherently lower exhaust emissions. DEF is then delivered in precisely-metered spra exhaust stream by the vehicle’s onboard computer. Exhaust gas and an atomized m the converter simultaneously. DEF undergoes a chemical reaction with catalyst inside and gives off water vapor and nitrogen gas. The sensor then monitors exhaust gases catalyst. The main computer gives feedback to alter the DEF flow when NOx levels f acceptable parameters.

References:

http://en.wikipedia.org/wiki/Selective_catalytic_reduction

http://alternativefuels.about.com/od/researchdevelopment/a/scr.htm