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

摘要

The selective catalytic reduction (SCR) system comprises an SCR reactor 3, an inlet flow system 1 and an evaporator module, wherein the SCR reactor 3 comprises at least one SCR catalyst and the inlet flow system 1 and / Wherein the inlet flow system 1 comprises at least one inlet for the exhaust gas from the engine, wherein the flow of gas through the at least one flow duct 11, 12 is in the vicinity of the SCR reactor 3 To provide heat to the evaporator module and into the SCR reactor after introduction of the ammonia-loaded gas stream and after passage through the plurality of baffle plates to provide a uniform gas concentration profile across the cross-section of the SCR reactor 3, The module comprises means for introducing the urea into the heated pre-reactor, wherein the urea is fed at least partially before introducing the exhaust gas stream into the SCR reactor (3) It is decomposed.