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The dynamic mechanism and emission characteristics of micro-explosion of biodiesel-ethanol-magnesium powder droplets

Author

Listed:
  • Meng, Kesheng
  • Sun, Xiaolei
  • Zhang, Hong
  • Zhang, Wei
  • Tao, Di
  • Zhang, Chen
  • Li, Dong
  • Wang, Gaofeng
  • Lin, Qizhao

Abstract

Biodiesel has significant commercial value and the addition of ethanol and magnesium powder can further enhance its combustion efficiency and improve the emission characteristics of combustion. In this paper, an optimized tube furnace experimental platform was used to investigate the micro-explosion characteristics and carbon monoxide (CO) emission characteristics of blended droplets with different magnesium powder contents (0.01g, 0.02g, 0.04g, and 0.08g) and a fixed volume of biodiesel and ethanol blended fuel (5 ml) under different operating conditions. Through experimental and theoretical analyses, four typical micro-explosion stages of the blended droplets during the heating process were revealed. It was found that the amount of magnesium powder added significantly affects the micro-explosion intensity of the droplets, and a moderate amount of magnesium powder (e.g., 0.02 g) promotes the evaporation and micro-explosion of the droplets, while an excessive amount weakens the micro-explosion intensity. Heating temperature and droplet volume is also an important factor affecting the micro-explosion characteristics of mixed droplets. In addition, the distribution, area and distortion of the secondary droplets generated after the micro-explosion are closely related to the micro-explosion intensity. Emission characteristics analysis shows that the micro-explosion intensity is positively correlated with the CO emission concentration, and the peak value of E50BD50(M0.02g) droplet reaches 68 ppm under 650 °C, but with the increase of temperature, the overall CO concentration shows a downward trend.

Suggested Citation

  • Meng, Kesheng & Sun, Xiaolei & Zhang, Hong & Zhang, Wei & Tao, Di & Zhang, Chen & Li, Dong & Wang, Gaofeng & Lin, Qizhao, 2026. "The dynamic mechanism and emission characteristics of micro-explosion of biodiesel-ethanol-magnesium powder droplets," Renewable Energy, Elsevier, vol. 259(C).
    • Handle: RePEc:eee:renene:v:259:y:2026:i:c:s0960148125027910
    DOI: 10.1016/j.renene.2025.125127
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