Development of Biogas-assisted Steam Methane Reforming Process for Power, Hydrogen, and Heat Production

Researchers at the University of Tabriz have developed a novel biogas-assisted steam methane reforming (SMR) process that integrates a supercritical CO2 Brayton cycle for waste heat recovery, aiming to improve thermodynamic efficiency and reduce environmental impacts. The study, published in the International Journal of Hydrogen Energy, demonstrates the technical feasibility of the system, which produces high energy and exergy efficiencies of 84.96% and 59.89%, respectively, with a hydrogen generation rate of 1.35 ton/hr.

Key Takeaways:

• The developed SMR system leverages biogas as a sustainable energy source for heating, reducing the need for fossil fuels and associated environmental challenges.
• The system's thermodynamic efficiency is improved through the integration of a supercritical CO2 Brayton cycle for waste heat recovery, with a minimum exergy destruction of 64% in the combustion chamber.
• The main heat exchanger and reformer demonstrate significant exergy destruction, highlighting the need for further optimization.
• The research concludes that raising the steam-to-carbon (S/C) ratio and reforming temperature improves hydrogen production but lowers net power output.

Statistics:

• Energy efficiency: 84.96%
• Exergy efficiency: 59.89%
• Hydrogen generation rate: 1.35 ton/hr
• Exergy destruction in the combustion chamber: 64%
• Thermodynamic performance metrics evaluated: energetic, exegetic, and environmental

Sources:

• Development and Thermodynamic Analysis of a Biogas-assisted Steam Methane Reforming Process Combined With a Supercritical Co2 Brayton Cycle for Power, Hydrogen, and Heat Production. International Journal of Hydrogen Energy, 2025; 140: 519-531. (Elsevier)
• Pull quote from University of Tabriz research: "This system integrates a supercritical CO2 Brayton cycle for waste heat recovery, aiming to improve thermodynamic efficiency."