Open Access

ARTICLE

Numerical Simulation of Turbulent Diffusion Flames of a Biogas Enriched with Hydrogen

Naima Krarraz^1,*, Amina Sabeur¹, Khadidja Safer², Ahmed Ouadha¹

1 Laboratoire des Science et Ingénierie Maritimes, Faculté de Génie Mécanique, Université des Sciences et de la Technologie d’Oran Mohamed Boudiaf, Oran, Algérie
2 Laboratoire des Carburants Gazeux et de l’Environnement, Faculté de Génie Mécanique, Université des Sciences et de la Technologie d’Oran Mohamed Boudiaf, Oran, 31000, Algérie

* Corresponding Authors: Naima Krarraz. Email: ;

Fluid Dynamics & Materials Processing 2024, 20(1), 79-96. https://doi.org/10.32604/fdmp.2023.026238

Received 26 August 2022; Accepted 08 June 2023; Issue published 08 November 2023

Abstract

Any biogas produced by the anaerobic fermentation of organic materials has the advantage of being an environmentally friendly biofuel. Nevertheless, the relatively low calorific value of such gases makes their effective utilization in practical applications relatively difficult. The present study considers the addition of hydrogen as a potential solution to mitigate this issue. In particular, the properties of turbulent diffusion jet flames and the related pollutant emissions are investigated numerically for different operating pressures. The related numerical simulations are conducted by solving the RANS equations in the frame of the Reynolds Stress Model in combination with the flamelet approach. Radiation effects are also taken into account and the combustion kinetics are described via the GRI-Mech 3.0 reaction model. The considered hydrogen fuel enrichment spans the range from 0% to 50% in terms of volume. Pressure varies between 1 and 10 atm. The results show that both hydrogen addition and pressure increase lead to an improvement in terms of mixing quality and have a significant effect on flame temperature and height. They also reduce CO₂ emissions but increase NOx production. Prompt NO is shown to be the predominant NO formation mechanism.

---

Graphic Abstract

---

Keywords

---