This paper evaluates the effectiveness and durability of a third generation experimental diesel oxidation catalyst (DOC) system on the emissions of a 2,850 kW EMD SD60M US EPA Tier 0 locomotive. The locomotive was originally manufactured in 1989, and the diesel engine was last overhauled and brought into EPA Tier 0 compliance in 2005. The DOC system was positioned in the pre-turbine exhaust flow. Locomotive Federal Test Procedure (FTP) testing was performed on the Union Pacific Railroad locomotive, before and after installation of the oxidation catalyst. The locomotive was then put into revenue service in California, and worked back to SwRI after completing sixmonths and 14-months of service for additional emissions testing and DOC inspection. Two previous generations of this DOC technology were installed on this same locomotive, starting in May 2006. Initial test results showed that the V-CAT produced a 46 percent reduction in brake specific particulate matter (PM) over the locomotive line-haul duty-cycle, and 32 percent reduction over the switcher duty-cycle. Hydrocarbons (HC) and Carbon Monoxide (CO) were reduced by 57 and 78 percent, respectively, over the US EPA line-haul cycle, and 55 and 69 percent over the switcher cycle. Initial testing of the V-CAT also demonstrated minimal fuel penalty, with back-to-back testing of the locomotive with and without the V-CAT showing that brake specific fuel consumption (BSFC) increased over the line-haul cycle by 0.5 percent and essentially no change over the switch cycle. Smoke opacity increased due to reduced engine breathing at Notch 6, but was well below Tier 0+ smoke limits. Testing at six and 14-months showed no significant degradation in emissions performance or engine performance. V-CAT inspections at six and 14-months revealed that there were no major durability issues. There were also no aftertreatment maintenance performed during the 14-month demonstration. Based on the results of this test program, a DOC may be a viable tool for meeting Tier 0+ PM standards for various EMD locomotive models. Additional field operation of any 'retrofit' DOC on EMD locomotives would likely be necessary to further validate the long-term reliability, as these locomotive engines are typically expected to operate for seven to ten years between overhauls.
Exhaust emissions from a 2,850 KW EMD SD60M locomotive equipped with an experimental diesel oxidation catalyst
2010
9 Seiten, 11 Bilder, 4 Tabellen, 5 Quellen
Conference paper
Storage medium
English
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