CPC F01N 3/2066 (2013.01) [F01N 3/035 (2013.01); F01N 3/022 (2013.01); F01N 3/2892 (2013.01); F01N 2240/16 (2013.01); F01N 2560/021 (2013.01); F01N 2560/026 (2013.01); F01N 2570/14 (2013.01); F01N 2610/02 (2013.01)] | 25 Claims |
1. A diesel-emissions reduction unit adapted for use with a diesel electric locomotive having a diesel engine and an electronic locomotive controller and a traction generator in communication with the diesel engine, the diesel emissions reduction unit comprising:
an inlet (825) adapted to receive an exhaust stream of the diesel engine;
a diesel oxidation trap catalyst (410) located adjacent the inlet and comprised of a substrate (411) including one or more corrugated, micro-expanded metal foil layers (413) containing a plurality of eyes (419) with openings;
a dosing system (33) including:
a dosing controller (39) including an injection lance (805) arranged to meter aqueous NH3 into the exhaust stream;
a nitrogen oxide (“NOx”) concentration sensor (41, 111);
an ammonia (“NH3”) concentration sensor (43, 113), and
at least one oxidation catalyst panel (119) arranged to isolate the NOx concentration sensor from NH3 in the exhaust stream; and
an exhaust heater (50) arranged to heat the exhaust stream of the diesel engine toward the inlet of the diesel emissions reduction unit.
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