COMPACT SELECTIVE CATALYTIC REDUCTION SYSTEM FOR NITROGEN OXIDE REDUCTION IN THEOXYGEN-RICH EXHAUST OF 500 TO 4500 KW INTERNAL COMBUSTION ENGINES

摘要

A Selective Catalytic Reduction (SCR) system comprises an SCR reactor (3), comprising at least one SCR catalyst and is in communication with the inlet flow system (1) and the vaporizer module, an inlet flow system (1), comprising one or more entrances for exhaust gases from an engine, wherein the flow of gases through at least one flow duct (11, 12) is located around the SCR reactor (3) and provides heat to the vaporizer module and is introduced into the SCR reactor after the introduction of an ammonia-laden gas stream and after passing through a plurality of baffle plates to provide an uniform gas concentration profile across the cross section of the SCR reactor (3), and a vaporizer module, comprising a means for introducing urea into a heated pre-reactor in which it is at least partially decomposed and prior to introducing the exhaust gas stream to the SCR reactor (3).