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Development and Demonstration of a Urea-SCR System for NOx Emission Reduction from Diesel Engines with Low-Temperature Duty Cycles
| Sub-Grantees: | Cummins Inc.
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Diesel engines operate over a wide temperature range. In some applications and duty cycles, low exhaust temperatures present challenges for proven diesel exhaust reduction technologies, such as Selective Catalytic Reduction (SCR). Application of SCR to low-temperature duty cycles is hindered by a number of technological challenges. These include the difficulty of converting urea solution into ammonia and achieving adequate efficiency of an SCR catalyst for reacting ammonia with NOx at low temperatures. Other key A/T components for conversion efficiency, like the Diesel Oxidation Catalyst (DOC), also have limited efficiency at these low-temperatures. The objective of this program is to evaluate and integrate aftertreatment components which enable operation of an SCR system with low exhaust temperatures. The system would include such components as an ammonia generation device, a low temperature SCR catalyst and a low-temperature DOC.
The system development in this program will be focused on a Heavy Duty Diesel Engine (the ISL 8.9L platform) applied to the medium duty cycle application. This will address the engine population with the most prevalent low-temperature duty cycles, such as refuse haulers, school buses and delivery trucks. However, it is expected that this technology will be applicable to a broad range of engine platforms, including retrofit.
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| Page Updated/Reviewed: 03/30/2007 10:29 AM |
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