Abstract
Optimization of the urea dosing system to maximize deNOx performance and to minimize NH3 slip during load changes is one of the main challenges for the mobile application of the urea–SCR (selective catalytic reduction) system. A mobile SCR system is restricted to a short distance between the engine exhaust and the catalyst entrance. Therefore, it is likely that urea residence time may not be adequate for complete thermolysis at the catalyst entrance. The key factors affecting the automobile application of SCR technology are the rapid thermolysis, good mixing of ammonia and gas, and reduction of ammonia slip. To this end, in the present study, the effects of the injection angle, urea injector location, and number of injection holes on the uniformity of the ammonia concentration distribution at the entrance of the SCR monolith as well as the maximum ammonia conversion efficiency have been examined in detailed three-dimensional numerical simulations under various engine loads of a heavy-duty diesel engine. A...
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