COMPACT SELECTIVE CATALYTIC REDUCTION SYSTEM FOR NITROGEN OXIDE REDUCTION IN OXYGEN-RICH EXHAUST OF 500 TO 4500 kW INTERNAL COMBUSTION ENGINES Russian patent published in 2018 - IPC F01N3/20 B01D53/94 

FIELD: separation.

SUBSTANCE: invention relates to the purification of internal combustion engine exhaust gases. Selective catalytic reduction (SCR) system comprises SCR reactor (3), inlet flow system (1), and a vaporiser module. SCR reactor (3) comprises at least one SCR catalyst and is in communication with inlet flow system (1) and the vaporiser module. Inlet flow system (1) comprises one or more entrances for exhaust gases from an internal combustion engine, wherein the entrance is configured to distribute the flow of gases through at least one flow duct (11, 12) located around SCR reactor (3), flow of exhaust gases through flow ducts (11, 12) around the SCR provides heat to the vaporiser module in which urea, or an ammonia precursor, is introduced into the vaporiser module to be converted to ammonia prior to being introduced into SCR reactor (3), and the flow of gases in each of flow ducts (11, 12) 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 approximately uniform gas velocity and concentration profile across the cross section of SCR reactor (3), and the vaporiser module comprises a means for introducing urea, or an ammonia precursor, into a heated pre-reactor, in which it is at least partially decomposed and subsequently fed into an exhaust gas stream prior to introducing the exhaust gas stream to SCR reactor (1).

EFFECT: compact selective catalytic reduction system comprising an SCR reactor, an inlet flow system, and a vaporizer module is described in which a stream of hot treated exhaust gas is used to provide for decomposition of the urea into its active components including ammonia.

17 cl, 6 dwg