SYSTEM AND METHOD FOR SUPPLYING OXYGENATE REDUCTANTS TO AN EMISSION TREATMENT SYSTEM

摘要

The invention provides a method for supplying reductants to an emission treatment unit (32) including supplying a first premixed fuel stream (14) to an engine (12), wherein the engine is configured to create an exhaust stream (30). A second premixed fuel stream (20) is supplied to a separation unit (18), wherein the first and second premixed fuel streams (14, 20) each comprise an oxygenate reductant component and a primary fuel component. At least a portion of the second premixed fuel stream is separated into a first fraction stream (42) and a second fraction stream (44) via the separation unit, wherein the first fraction stream comprises a higher concentration of the oxygenate reductant component than the second fraction stream, and supplying the first fraction stream to an emission treatment unit to treat the exhaust stream. The invention further provides a system to carry out said method.