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Research Papers: Internal Combustion Engines

Investigation of Hydrogen Emissions in Partially Premixed Diesel Combustion

[+] Author and Article Information
William F. Northrop, Lucas M. Vanderpool, Praveen V. Madathil, Dennis N. Assanis, Stanislav V. Bohac

Department of Mechanical Engineering, University of Michigan, Ann Arbor, MI 48109

J. Eng. Gas Turbines Power 132(11), 112803 (Aug 16, 2010) (6 pages) doi:10.1115/1.4001069 History: Received September 23, 2009; Revised October 06, 2009; Published August 16, 2010; Online August 16, 2010

Partially premixed combustion strategies offer many advantages for compression ignition engines. One such advantage for those operating on diesel fuels is the simultaneous reduction in soot and NOx achievable over a wide range of equivalence ratios. Though often not measured in engine experiments, gaseous H2 is a byproduct of incomplete combustion and can be useful for the regeneration of aftertreatment devices. Correlations for the exhaust concentration of H2, mostly derived from experiments with homogeneous spark ignition engines, indicate that it is emitted either in proportion to CO directly or as a function of a pseudowater gas shift equilibrium constant. In this work, H2 is measured over a range of equivalence ratios in a multicylinder diesel engine operating in a partially premixed low temperature combustion (LTC) mode using both low sulfur diesel fuel and soy-based biodiesel. Biodiesel was found to have the same bulk gas emissions of major species including H2 over the range of equivalence ratio in LTC for a constant load and combustion phasing. It also was found that the experimental H2 concentration was near the value predicted by the equilibrium constant for equivalence ratios greater that 0.85 but was increasingly lower for leaner points.

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Copyright © 2010 by American Society of Mechanical Engineers
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Figures

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Figure 1

Flow diagram of engine intake and exhaust system

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Figure 2

Heat release data analysis for ULSD richest and leanest points

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Figure 3

BSFC and intake manifold pressure as a function of ΦInt

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Figure 4

Plot of FSN versus NOx emissions as a function of ΦInt for ULSD and B100

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Figure 5

Experimental exhaust concentrations of CO, CO2, THC, H2, H2O, and O2 as a function of ΦInt for ULSD and B100 fuels

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Figure 6

Experimental H2 concentration for ULSD as a function of ΦInt compared with that calculated by Eqs. 2,4

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Figure 7

K calculated from experimental emissions data for B100 and ULSD

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Figure 8

KWGS as calculated by thermodynamic equilibrium of the WGS reaction, Eqs. 1,3

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