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Burner System to Raise Temperature of Diesel Exhaust to Reach SCR Operating Range for NOx Reduction
| Sub-Grantees: | Woodward Governor
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Diesel NOx emissions have been the subject of intense research over the past two decades. Approaches have concentrated on either in-cylinder reductions or aftertreatment. Of the aftertreatment approaches SCR systems have gained the greatest support, promising NOx mitigation up to 90% in certain circumstances. An added benefit with aftertreatment systems is that the base engine is not affected, and a wide range of engines can be serviced by a relatively small number of sizes of SCR systems. The downside of this strategy is that occasional maintenance by the engine owner is required to ensure an uninterrupted urea supply, and the engine owner must bear that cost.
SCR systems work very effectively when the exhaust gases are in the range of 300°C to 450°C. When exhaust gas temperatures are below this range some form of thermal regulation is required. Woodward has developed proprietary technology around its SmartFire™ ion-feedback system with a controller and a burner that can provide the degree of thermal regulation required to ensure the temperatures of exhaust gases are elevated to the range of efficient operation of the SCR, while simultaneously promising to minimize ammonia slip while providing high levels of NOx reduction.
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| Page Updated/Reviewed: 03/30/2007 10:28 AM |
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