Patent ID: 7874147
Filing Date: 2011-01-25
Classification: F01N,Y02T

Abstract:
1. A method of reducing NOx in exhaust gases generated by an internal combustion engine, comprising: advancing the exhaust gases along an exhaust path to a selected catalytic reduction (SCR) catalyst positioned downstream from the internal combustion engine, activating a heat source if the exhaust gases are below a predetermined temperature, such that the exhaust gases along a segment of the exhaust path upstream of the SCR catalyst are heated to a temperature of 700-1000° C., positioning a first injector proximate to the heat source and positioning a second injector proximate to an emission abatement component, operating the first injector to inject reductant when the heat source is activated, and injecting reductant into the segment of the exhaust path to react in the segment with NOx in the exhaust gases while the heat source is activated until a sensed temperature reaches the predetermined temperature, and deactivating the heat source if the temperature of the exhaust gases at the catalyst rises above the first predetermined temperature; and operating the second injector to inject reductant when the heat source is deactivated.