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Diesel Emission Control Systems


Selective catalytic reduction (SCR) is the most effective technique for reducing oxides of nitrogen (NOx) from diesel engines and most other pollution sources. Though SCR has been used for more than 30 years on large, stationary pollution sources such as power plants, until recently, the size, weight, and cost of SCR systems made them impractical for small-scale and mobile applications.  

At EF&EE, we offer Compact SCR™ systems that use the same technology originally developed for heavy-duty diesel truck engines to meet Euro 5 and U.S. 2010 emission standards. EF&EE Compact SCR™ systems are about 1/5th the size and weight of old-style SCR systems. Unlike the systems sold with new engines, however, EF&EE's Compact SCR™ systems are designed as “bolt-on” retrofits, independent of the engine controller. This makes them practical for retrofit—either to existing engines or to new engines not factory-produced with SCR.

Highly effective systems

Compact SCR™ systems can reduce NOx emissions from existing diesels by 90 percent to 98 percent, depending on the exhaust temperature! The Compact SCR™ catalyst is also a highly effective diesel-oxidation catalyst. Diesel particulate matter (PM) emissions are typically reduced by 40 percent to 60 percent, total HC by 80 percent, and carbon monoxide (CO) by more than 90 percent. Even greater PM reductions can be obtained by combining Compact SCR™ with diesel particulate filters. 

EF&EE's Compact SCR™ systems are designed for ruggedness and reliability. Production capabilities make them highly cost-effective, even in small-scale applications. In most cases, a Compact SCR™ retrofit will enable an older diesel to meet current emission standards, avoiding the cost of repowering or replacement.

Compact SCR Applications