Role of hydrogen in improving performance and emission characteristics of homogeneous charge compression ignition engine fueled with graphite oxide nanoparticle-added microalgae biodiesel/diesel blends

• Published in: International journal of hydrogen energy 2022-10, Vol.47 (88), p.37617-37634
• Main Authors: Murugesan, Parthasarathy, Hoang, Anh Tuan, Perumal Venkatesan, Elumalai, Santosh Kumar, Dash, Balasubramanian, Dhinesh, Le, Anh Tuan, Pham, Van Viet
• Format: Article
• Language: English
• Subjects: Biodiesel; Engine behavior; Graphite oxide; HCCI engine; Hydrogen enrichment; Microalgae
• ISSN: 0360-3199; 1879-3487
• DOI: 10.1016/j.ijhydene.2021.08.107

The development of low-temperature combustion models combined with the use of biofuels has been considered as an efficient strategy to reduce pollutant emissions like CO, HC. NOx, and smoke. Indeed, Homogeneous Charge Compression Ignition (HCCI) is the new approach to drastically minimize NOx emissions and smoke owing to the lower cylinder temperature and a higher rate of homogeneous A/F mixture as compared to compression ignition (CI) engines. The present research deal with the behavior analysis of a CI engine powered by diesel, Euglena Sanguinea (ES), and their blends (ES20D80, ES40D60, ES60D40, ES80D20). The experimental results revealed the highest brake thermal efficiency for ES20D80 although it decreased by 4.1% compared to diesel at normal mode. The average drop in HC, CO, and smoke was 2.1, 2.3, and 5.7% for ES20D80 as opposed to diesel fuel. Therefore, in the next stage, ES20D80 with various concentrations of graphite oxide (GO) nanoparticle (20, 40, 60, and 80 ppm) was chosen to carry out experiments in the HCCI mode, in which hydrogen gas was induced along with air through the intake pipe at a fixed flow rate of 3 lpm for the enrichment of the air-fuel mixture. As a result, the combination of hydrogen-enriched gas and GO-added ES20D80 in the HCCI mode showed similar performance to the CI engine but registered a major reduction of NOx and smoke emissions, corresponding to 75.24% and 53.07% respectively, as compared to diesel fuel at normal mode. [Display omitted] •Dropped harmful emission by combination of GO and H2-enriched ES20D80 in HCCI mode.•Superior performance of HCCI mode for H2-enriched ES20D80 containing 80 ppm GO.•Slight increase in HC and CO emissions with lower GO concentration in the HCCI mode.•Drastic reduction in NOx and smoke emissions in the HCCI combustion mode.•Smooth HCCI-based operation for H2-enriched ES20D80 blending 80 ppm GO at peak load.