Internal Combustion Engines

Exhaust Emissions Characterization of a Turbocharged 2-Stroke Tier 0+ Locomotive Engine: NOx , Particulate Matter and Soluble Organic Fraction Composition

[+] Author and Article Information
Stanislav V. Bohac1

 University of Michigan, Ann Arbor, MI 48109sbohac@umich.edu

Eric Feiler, Ian Bradbury

Peaker Services, Inc., Brighton, MI 48116


Corresponding author.

J. Eng. Gas Turbines Power 134(7), 072804 (May 23, 2012) (8 pages) doi:10.1115/1.4006006 History: Received November 02, 2011; Revised November 18, 2011; Published May 23, 2012; Online May 23, 2012

This study presents a detailed exhaust emission characterization of a 2-Stroke turbocharged line haul locomotive diesel engine fitted with an early-development Tier 0 + emissions kit. The objective of this work is to use emissions characterization to gain insight into engine operation and mechanisms of pollutant formation for this family of engine, and identify areas of potential future engine emissions improvement. Results show that at the notches tested (notches 3–8) the largest contributor to particulate matter (PM)mass is insolubles (mostly elemental carbon), but that the soluble component of PM, comprising 14–32% of PM, is also significant. Gas chromatography (GC) analysis of the soluble portion shows that it is composed of 55–77% oil-like C22 –C30+ hydrocarbons, with the remainder being fuel-like C9 –C21 hydrocarbons. The emissions characterization suggests that advancing combustion timing should be effective in reducing PM mass by reducing the insoluble portion (elemental carbon) of PM at all notches. NOx will likely increase, but the current level of NOx is sufficiently below Tier 0+ limits to allow a moderate increase. Reducing engine oil consumption should also reduce PM mass at all notches, although to a smaller degree than measures that reduce the insoluble portion of PM.

Copyright © 2012 by American Society of Mechanical Engineers
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Figure 1

PM sampling flow diagram

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Figure 2

Cylinder pressure at notches 3 and 8

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Figure 3

Brake specific fuel consumption versus notch position

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Figure 4

Brake specific NOx emissions versus notch position

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Figure 5

Brake specific PM emissions versus notch position

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Figure 6

Repeatability of GC-FID analysis of SOF composition at notch 3

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Figure 7

Fuel composition by carbon number

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Figure 8

Oil composition by carbon number

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Figure 9

SOF composition at notch 3

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Figure 10

SOF composition at notch 5

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Figure 11

SOF composition at notch 8

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Figure 12

SOF composition, grouped by fuel-like and oil-like HC

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Figure 13

PM composition versus notch position




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