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Urea Conversion for Low‐Temperature Selective Catalytic Reduction in a Swirled Diesel Exhaust Gas Configuration
Author(s) -
Gierth Sandro,
Hartl Sandra,
Pollack Martin,
Hasse Christian,
Hofmann Uwe,
Zikoridse Gennadi,
Rautenberg Helge,
Will Frank,
Hahn Christoph,
Kureti Sven
Publication year - 2022
Publication title -
chemical engineering and technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.403
H-Index - 81
eISSN - 1521-4125
pISSN - 0930-7516
DOI - 10.1002/ceat.202100571
Subject(s) - test bench , exhaust gas recirculation , exhaust gas , diesel engine , computational fluid dynamics , diesel fuel , flow (mathematics) , selective catalytic reduction , mechanics , mixing (physics) , materials science , diesel exhaust , urea , petroleum engineering , mechanical engineering , chemistry , automotive engineering , catalysis , engineering , waste management , physics , organic chemistry , quantum mechanics
A novel design of an AdBlue mixing unit to reduce urea deposits at low temperatures in diesel exhaust is described. The main principle of the mixer includes the injection of AdBlue in an axisymmetric swirling flow, which is achieved by splitting the exhaust stream and off‐centred introduction of the sub‐flows. Crucial geometric parameters were analyzed by computational fluid dynamics (CFD) simulations towards pressure loss, flow field, and spray morphology. Deposit formation was experimentally investigated on three upscaling levels implying an optical test bench, a diesel engine test bench, and a hydraulic excavator. In particular, the studies with the hydraulic excavator showed neither deposits nor critical back pressure. Overall, the experiments substantiated the working principle of the AdBlue mixer.