Patent ID: 8173088

Claim:
A method for injection of a liquid reductant into an exhaust gas and for evaporating and decomposing the liquid reductant at an elevated temperature, the method comprising: providing an exhaust pipe having an interior surface and disposing the exhaust pipe in fluid communication with and upstream of a catalyst; disposing an internal cone within the exhaust pipe and disposed generally parallel to the exhaust pipe; mounting an injector to the exterior of the exhaust pipe and in fluid communication with the internal cone; injecting the liquid reductant into the internal cone; directing the exhaust gas in a passage between the interior surface of the exhaust pipe and the internal cone and directing the exhaust gas within the internal cone, the flow of exhaust gas having an elevated temperature compared to an ambient; creating a drag force on the injected liquid reductant to increase the travel time of the injected liquid reductant from the injector to the catalyst.