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Johnson Matthey SCRT System Cut NOx Emissions by 84% in Fleet Trial of Retrofitted Class 8 Trucks

27 March 2008

Retrofit SCRT System Diagram. Click to enlarge.

In a demonstration using 16 older retrofitted Class 8 grocery trucks that are part of Raley’s fleet, the Johnson Matthey (JM) SCRT four-way control heavy-duty system reduced NO_x by an average of 84% compared to pre-retrofit levels.

The trucks involved had 2004 Cummins, 400 hp ISM engines with an EGR (exhaust gas recirculation) system. The ISM is a commonly used engine in Class 8 trucks hauling heavy loads. Working with partner Cummins Emissions Solutions, the Johnson Matthey emissions system was tested for more than 1,000 hours as the trucks traveled throughout Northern California hauling grocery products to Raley’s family of grocery stores.

The demonstration program involved a local partnership between Raley’s, the Sacramento Metropolitan Air Quality Management District (SMAQMD), and the Sacramento Emergency Clean Air and Transportation program (SECAT).

The next stage for this technology is verification by the California Air Resources Board and the US Environmental Protection Agency, which is underway now that the 1,000 hours of real-world use has been completed. Johnson Matthey has nearly 50 demonstration units running in California and Texas. After thousands of hours of operation, the SCRT system retrofits on both EGR and non-EGR engines has reduced NO_x emissions by as much as 84%.

The SCRT system. Click to enlarge.

The 4-way SCRT exhaust emission control system combines Johnson Matthey’s patented two-stage CRT particulate filter system (to reduce particulate matter by more than 85%) with a selective catalytic reduction (SCR) catalyst that reduces oxides of nitrogen (NO_x) between 60 - 80%. It also reduces carbon monoxide (CO) and hydrocarbons (HC) by more than 90%. The result is an older truck with NO_x emissions lower than those of a brand-new 2008 truck.

Engine exhaust first flows through the CRT diesel particulate filter to reduce CO, PM, and HC. A controlled amount of urea is then injected into the exhaust before it enters the SCR catalyst bed. The SCR system consists of a commercially available urea injection system and a JM-developed control system that precisely delivers urea without ammonia slip. The engine also uses JM’s proprietary SCR catalyst technology that can be supported by metal or ceramic monolith substrates of various cell densities for maximum catalyst activity and minimal pressure drop.

Resources

• NO_x and PM Emissions Control on Heavy-duty Diesel Engines Using SCRT System

March 27, 2008 in Diesel, Emissions, Heavy-duty | Permalink | Comments (0) | TrackBack (0)

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