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Title: Single-fuel reactivity controlled compression ignition through catalytic partial oxidation reformation of diesel fuel

Abstract

A single-fuel RCCI concept has been proposed to avoid the need for a secondary fuel system required for conventional RCCI by generating the secondary fuel from the primary fuel through catalytic partial oxidation (CPOX) reformation. In conventional RCCI, gasoline or natural gas can be used as the low-reactivity fuel, and diesel can be used as the high-reactivity fuel. In this study, two reformate mixtures generated by reforming diesel fuel at different operating conditions were used as the low-reactivity fuel, with the parent diesel as the high reactivity fuel. The combustion characteristics of reformate-diesel RCCI were compared with the conventional RCCI. A CFD model was also developed and validated against the experimental results. The model was then used to validate a necessary approximation of the reformate mixture's species concentrations. Compared to conventional RCCI fuel pairs, reformate-diesel RCCI shows marginally better thermal efficiency, approximately 10% better THC emissions, approximately 50% lower NOx emissions, and good controllability. Because the reformate mixture has a high concentration of diluents it displaces a large fraction of intake air and acts similarly to EGR. The combustion behavior of reformate-diesel RCCI is in between that of gasoline-diesel and natural gas-diesel conventional RCCI. From the results, it can bemore » concluded that reformate-diesel RCCI is not overly sensitive to the reformation process itself and the exact species concentrations in the reformate mixture. Finally, a small change in the start of injection of diesel, blend ratio, and EGR fraction can be used to compensate for reformate mixture concentration differences.« less

Authors:
ORCiD logo [1];  [2];  [2]; ORCiD logo [1]; ORCiD logo [2]
  1. Stony Brook Univ., NY (United States)
  2. Clemson Univ., SC (United States)
Publication Date:
Research Org.:
Stony Brook Univ., NY (United States)
Sponsoring Org.:
USDOE Office of Energy Efficiency and Renewable Energy (EERE), Vehicle Technologies Office (EE-3V)
OSTI Identifier:
1607730
Alternate Identifier(s):
OSTI ID: 1580148
Grant/Contract Number:  
EE0007216
Resource Type:
Accepted Manuscript
Journal Name:
Fuel
Additional Journal Information:
Journal Volume: 264; Journal Issue: C; Journal ID: ISSN 0016-2361
Publisher:
Elsevier
Country of Publication:
United States
Language:
English
Subject:
33 ADVANCED PROPULSION SYSTEMS

Citation Formats

Hariharan, Deivanayagam, Rahimi Boldaji, Mozhgan, Yan, Ziming, Mamalis, Sotirios, and Lawler, Benjamin. Single-fuel reactivity controlled compression ignition through catalytic partial oxidation reformation of diesel fuel. United States: N. p., 2019. Web. https://doi.org/10.1016/j.fuel.2019.116815.
Hariharan, Deivanayagam, Rahimi Boldaji, Mozhgan, Yan, Ziming, Mamalis, Sotirios, & Lawler, Benjamin. Single-fuel reactivity controlled compression ignition through catalytic partial oxidation reformation of diesel fuel. United States. https://doi.org/10.1016/j.fuel.2019.116815
Hariharan, Deivanayagam, Rahimi Boldaji, Mozhgan, Yan, Ziming, Mamalis, Sotirios, and Lawler, Benjamin. Fri . "Single-fuel reactivity controlled compression ignition through catalytic partial oxidation reformation of diesel fuel". United States. https://doi.org/10.1016/j.fuel.2019.116815. https://www.osti.gov/servlets/purl/1607730.
@article{osti_1607730,
title = {Single-fuel reactivity controlled compression ignition through catalytic partial oxidation reformation of diesel fuel},
author = {Hariharan, Deivanayagam and Rahimi Boldaji, Mozhgan and Yan, Ziming and Mamalis, Sotirios and Lawler, Benjamin},
abstractNote = {A single-fuel RCCI concept has been proposed to avoid the need for a secondary fuel system required for conventional RCCI by generating the secondary fuel from the primary fuel through catalytic partial oxidation (CPOX) reformation. In conventional RCCI, gasoline or natural gas can be used as the low-reactivity fuel, and diesel can be used as the high-reactivity fuel. In this study, two reformate mixtures generated by reforming diesel fuel at different operating conditions were used as the low-reactivity fuel, with the parent diesel as the high reactivity fuel. The combustion characteristics of reformate-diesel RCCI were compared with the conventional RCCI. A CFD model was also developed and validated against the experimental results. The model was then used to validate a necessary approximation of the reformate mixture's species concentrations. Compared to conventional RCCI fuel pairs, reformate-diesel RCCI shows marginally better thermal efficiency, approximately 10% better THC emissions, approximately 50% lower NOx emissions, and good controllability. Because the reformate mixture has a high concentration of diluents it displaces a large fraction of intake air and acts similarly to EGR. The combustion behavior of reformate-diesel RCCI is in between that of gasoline-diesel and natural gas-diesel conventional RCCI. From the results, it can be concluded that reformate-diesel RCCI is not overly sensitive to the reformation process itself and the exact species concentrations in the reformate mixture. Finally, a small change in the start of injection of diesel, blend ratio, and EGR fraction can be used to compensate for reformate mixture concentration differences.},
doi = {10.1016/j.fuel.2019.116815},
journal = {Fuel},
number = C,
volume = 264,
place = {United States},
year = {2019},
month = {12}
}

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Cited by: 1 work
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