Research Papers: Internal Combustion Engines

Method and Detailed Analysis of Individual Hydrocarbon Species From Diesel Combustion Modes and Diesel Oxidation Catalyst

[+] Author and Article Information
Manbae Han1

 University of Michigan, 1231 Beal Avenue, Ann Arbor, MI 48109manbaeh@umich.edu

Dennis N. Assanis

 University of Michigan, 1231 Beal Avenue, Ann Arbor, MI 48109assanis@umich.edu

Timothy J. Jacobs

 Texas A&M University, 321 EPB 3123 TAMU, College Station, TX 77843

Stanislav V. Bohac

 University of Michigan, 1231 Beal Avenue, Ann Arbor, MI 48109sbohac@umich.edu


Corresponding author.

J. Eng. Gas Turbines Power 130(4), 042803 (Apr 29, 2008) (10 pages) doi:10.1115/1.2900728 History: Received March 23, 2007; Revised January 28, 2008; Published April 29, 2008

An undiluted exhaust hydrocarbon (HC) speciation method, using flame ionization detector gas chromatographs, is developed to investigate HC species from conventional and low-temperature premixed charge compression ignition (PCI) combustion pre- and postdiesel oxidation catalyst (DOC) exhaust. This paper expands on previously reported work by describing in detail the method and effectiveness of undiluted diesel exhaust speciation and providing a more detailed analysis of individual HC species for conventional and PCI diesel combustion processes. The details provided regarding the effectiveness of the undiluted diesel exhaust speciation method include the use of a fuel response factor for HC species quantification and demonstration of its linearity, detection limit, accuracy, and precision. The listing of individual HC species provides not only the information needed to design surrogate exhaust mixtures used in reactor tests and modeling studies but also sheds light on PCI combustion and DOC characteristics. Significantly increased engine-out concentrations of acetylene, benzene, and toluene support the theory that net soot reduction associated with PCI combustion occurs due to the reduction of soot formation (as opposed to increased soot oxidation). DOC oxidation behavior differs depending on the combustion characteristics, which change exhaust species and temperature.

Copyright © 2008 by American Society of Mechanical Engineers
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Figure 1

RFs with respect to different calculation methods

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Figure 2

Low sulfur Swedish diesel fuel chromatogram analyzed by GC-2; oven temperature profiles: 40°C for 5min, 6°∕min for 43.33min, 300°C for 0min; FID=300°C, injection port=250°C; split ratio 20:1, total flow=27ml∕min, and column flow=1.2ml∕min

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Figure 3

Distribution of n-alkanes in the fuel and DOC-out exhaust samples for each combustion mode

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Figure 4

Correlation between emission bench analyzed HC and GC analyzed HC concentrations from lean conventional, lean PCI, and rich PCI modes

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Figure 5

Correlation between emission bench and GC analyzed HC conversion efficiency during DOC degreening experiments

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Figure 6

Engine-out HC concentration versus carbon number

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Figure 7

Engine-out relative HC composition organized by carbon number

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Figure 8

DOC-out relative HC composition organized by carbon number

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Figure 9

HC conversion efficiency versus carbon number

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Figure 10

Conversion efficiency of CO, alkenes+alkynes, aromatics, nonmethane alkanes, and methane




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