A Diesel Oxidation Catalyst for Exhaust Emissions Reduction

This paper describes the test results of a program to apply an experimental diesel oxidation catalyst (DOC) to a 2,850 kW freight locomotive. Locomotive emissions and fuel consumption measurements were performed on an Electro-Motive Diesel (EMD) model SD60M locomotive, owned by Union Pacific Railroad company, that had been recently rebuilt to EPA Tier 0 exhaust emission certification levels. Emission testing was performed at the Southwest Research Institute (SwRI) Locomotive Exhaust Emissions Test Center in San Antonio, Texas. US EPA-regulated emission levels of hydrocarbons (HC), carbon monoxide (CO), oxides of nitrogen (NOx), and participate (PM) were measured using U.S. EPA locomotive certification test procedures in three configurations; first a baseline with a relatively high sulfur diesel fuel (2,913 ppm sulfur) meeting EPA locomotive certification test specifications, and another baseline using ultra-low sulfur diesel fuel (ULDS), and finally a test using ULSD after the installation of a diesel oxidation catalyst designed and manufactured by MIRATECH Corporation (patent pending). The DOC was applied pre-turbine, within the exhaust manifold due to both space and exhaust temperature considerations. This paper describes the design of the DOC-equipped exhaust manifold, and reports the changes in the regulated exhaust emission levels between the baseline tests and after installation of the DOC. Also described is a locomotive on-board monitoring system used to monitor DOC performance during ongoing revenue service field testing.

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The effect of biodiesel on activity of diesel oxidation catalyst and selective catalytic reduction catalysts in diesel engine

Renewable and Sustainable Energy Reviews ◽

10.1016/j.rser.2021.111286 ◽

2021 ◽

Vol 148 ◽

pp. 111286

Author(s):

Ibrahim Aslan Resitoglu

Keyword(s):

Diesel Engine ◽

Selective Catalytic Reduction ◽

Catalytic Reduction ◽

Diesel Oxidation Catalyst ◽

Oxidation Catalyst ◽

Diesel Oxidation ◽

Reduction Catalysts

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Development of a Low Emissions Upgrade Kit for EMD GP20D and GP15D Locomotives

ASME 2012 Internal Combustion Engine Division Fall Technical Conference ◽

10.1115/icef2012-92128 ◽

2012 ◽

Author(s):

Steven G. Fritz ◽

John C. Hedrick ◽

Tom Weidemann

Keyword(s):

Fuel Injection ◽

Diesel Oxidation Catalyst ◽

Oxidation Catalyst ◽

Particulate Filter ◽

Injection Timing ◽

Fuel Injection Timing ◽

Tier 1 ◽

Emission Regulations ◽

Diesel Oxidation ◽

Tier 3

This paper describes the development of a low emissions upgrade kit for EMD GP20D and GP15D locomotives. These locomotives were originally manufactured in 2001, and met EPA Tier 1 locomotive emission regulations. The 1,491 kW (2,000 HP) EMD GP20D locomotives are powered by Caterpillar 3516B engines, and the 1,119 kW (1,500 HP) EMD GP15D locomotives are powered by Caterpillar 3512B engines. CIT Rail owns a fleet of 50 of these locomotives that are approaching their mid-life before first overhaul. Baseline exhaust emissions testing was followed by a low emissions retrofit development focusing on fuel injection timing, crankcase ventilation filtration, and application of a diesel oxidation catalyst (DOC), and then later a diesel particulate filter (DPF). The result was a EPA Tier 0+ certification of the low emissions upgrade kit, with emission levels below EPA Line-Haul Tier 3 NOx, and Tier 4 HC, CO, and PM levels.

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