Second-law analysis of the reforming-controlled compression ignition

Amnon Eyal and Leonid Tartakovsky

Applied Energy, 2020, vol. 263, issue C, No S0306261920301343

Abstract: This paper presents the optimization of energy conversion in a novel reforming-controlled compression ignition system, combining the benefits of low-temperature combustion with high-pressure thermochemical recuperation (mostly from the perspective of the second law of thermodynamics). Further, new insights into ways of improving efficiency are provided. A promising renewable fuel dimethyl ether is analyzed for the first time as a primary fuel. A comprehensive analysis of various factors influencing exergy destruction in the reforming-controlled compression ignition system in their complex interdependence is also performed for the first time. Exergy mapping results show that approximately 33% of the exergy supplied to the system is destroyed owing to irreversible processes in the cylinder itself, and approximately 5% is destroyed in the reforming system (intercooler, vaporizer, and reformer). The reformer is the main source of exergy destruction in the reforming system. Approximately 45% and 38% of the engine exergy destruction is related to chemical reaction and in-cylinder-walls heat interaction, respectively. The results indicate that the efficiency improvement due to second-law optimization reaches up to 7.1%, and if the compression ratio is increased to 18:1 instead of 16:1, this reaches up to 9.2%. The higher improvement is achieved at the highest loads.

Keywords: Homogeneous charge compression ignition; Fuel reactivity control; Thermochemical recuperation; Exergy analysis; Hydrogen; Dimethyl ether (search for similar items in EconPapers)
Date: 2020
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Citations: View citations in EconPapers (5)

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DOI: 10.1016/j.apenergy.2020.114622

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