Abstract
A stand-alone retrofit urea-SCR after-treatment system has been developed employing a pre-SCR NOx sensor, exhaust flow measurement, wire mesh mixer, clean-up catalyst, open-loop feed-forward control and stoichiometric NOx reduction logic. Demonstration of the urea-SCR system on a 1991 Detroit Diesel Corporation 12L engine in a West Virginia University (WVU) transient test cell achieved a 50% weighted NOx reduction and zero ammonia slip over the ICOMIA E5 marine cycle. The cost-effectiveness of the urea-SCR system was determined, including a $50 000 capital cost and $2705/t NOx reduced annually, which is consistent with Carl Moyer program estimates.
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