Brodrick, Christie-Joy, Mohammad Farshchi, Mike Jackson, Harry A. Dwyer, Hongchang Zhou, Daniel Sperling (2000) Urea-SCR System Demonstration and Evaluation for Heavy-Duty Diesel Trucks: Phase I, Preliminary Emissions Test Results and Cost-Effectiveness Analysis. Institute of Transportation Studies, University of California, Davis, Presentation Series UCD-ITS-RP-00-05
As Phase I of a urea selective catalyst reduction (urea-SCR) demonstration and evaluation project, the Institute of Transportation Studies at the University of California, Davis (ITS-Davis) has conducted engine dynamometer emissions tests on the Siemens-Westinghouse urea-SCR system, SINOx™. ITS-Davis also conducted a preliminary cost-effectiveness estimate for urea-SCR technology, in general. ITS-Davis and its partners Freightliner Corporation, Detroit Diesel Corporation, and Siemens-Westinghouse conducted engine dynamometer testing of the SINOx System on the Federal Test Procedure (FTP) using certification diesel fuel. The SINOx System achieved 1.0 g/bhp-hr NOx emissions on the FTP on a 1999 DDC Series 60 engine. The system achieved a 73% reduction from the engine baseline emissions of 3.67 g/bhp-hr on the FTP. There was no measurable effect on fuel economy. Probable limitations of the current generation SINOx demonstration system include size, weight, and the potential for tampering. The cost-effectiveness of SCR technology for 2000 model year HDDVs is estimated at less than $2,000 per ton of NOx removed for new vehicle applications. ITS-Davis is currently evaluating potential barriers to SCR implementation including fleet resistance to adding an additional fluid (urea) and the need for special urea fueling infrastructure. Phase II of the SCR demonstration and evaluation project, scheduled to begin in January 2000, will address durability, consumer acceptance, tampering, catalyst effect on PM size distribution, cost, and on-road emissions levels.