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<p>Biogas, sourced from livestock waste, wastewater treatment plants, and municipal solid waste, offers a promising feedstock for hydrogen production through chemical looping processes. This study focuses on optimizing a Chemical Looping Reforming system for hydrogen production, using different biogas compositions and enhancing efficiency in the Aspen Plus (software). The goal is to maximize hydrogen production while minimizing CO₂ emissions. A sensitivity analysis evaluated the impact of variables such as biogas composition, temperature, water flow, and oxygen carrier quantity. Results show that higher CH₄ fractions in biogas are more favorable for hydrogen production, with an optimal CH₄/CO₂ ratio of 70/30%. The highest H<sub>2</sub> production was achieved at a reactor temperature of 600&#xa0;°C, with flows of H<sub>2</sub>O, CaO, and NiO set at 4&#xa0;mol/h, 1.55&#xa0;mol/h, and 1&#xa0;mol/h per 1.602&#xa0;mol/h of biogas feed. The optimized model produced 3.434&#xa0;mol/h of H₂, with 99.2% CH<sub>4</sub> conversion and 98.5% H<sub>2</sub> purity. Implementing this model at full scale, such as at the Aguas Claras treatment plant (Medellin, Colombia), shows the potential for H<sub>2</sub> production, with an estimated output of 1367 tonnes H₂ year⁻<sup>1</sup>. Beyond technical optimization, a preliminary techno-economic analysis was conducted, estimating a levelized cost of hydrogen of $2.99/kg and identifying a minimum hydrogen selling price of $4.75/kg for economic viability. These results demonstrate that biogas-fed CLR systems are technically feasible and approach commercial competitiveness at scale, particularly when low-cost feedstock and economies of scale are secured.</p>

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Modeling and Optimization of a Chemical Looping Process for Green Hydrogen Production Using Biogas

  • 期刊论文

  • 发表日期：

    2025年10月22日

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  • Esteban Vanegas-Trujillo,
  • Carlos E. Arrieta,
  • Karen Cacua,
  • Bernardo Herrera,
  • Pedro N. Alvarado,
  • Mario Luna-delRisco

摘要

Biogas, sourced from livestock waste, wastewater treatment plants, and municipal solid waste, offers a promising feedstock for hydrogen production through chemical looping processes. This study focuses on optimizing a Chemical Looping Reforming system for hydrogen production, using different biogas compositions and enhancing efficiency in the Aspen Plus (software). The goal is to maximize hydrogen production while minimizing CO₂ emissions. A sensitivity analysis evaluated the impact of variables such as biogas composition, temperature, water flow, and oxygen carrier quantity. Results show that higher CH₄ fractions in biogas are more favorable for hydrogen production, with an optimal CH₄/CO₂ ratio of 70/30%. The highest H2 production was achieved at a reactor temperature of 600 °C, with flows of H2O, CaO, and NiO set at 4 mol/h, 1.55 mol/h, and 1 mol/h per 1.602 mol/h of biogas feed. The optimized model produced 3.434 mol/h of H₂, with 99.2% CH4 conversion and 98.5% H2 purity. Implementing this model at full scale, such as at the Aguas Claras treatment plant (Medellin, Colombia), shows the potential for H2 production, with an estimated output of 1367 tonnes H₂ year⁻1. Beyond technical optimization, a preliminary techno-economic analysis was conducted, estimating a levelized cost of hydrogen of $2.99/kg and identifying a minimum hydrogen selling price of $4.75/kg for economic viability. These results demonstrate that biogas-fed CLR systems are technically feasible and approach commercial competitiveness at scale, particularly when low-cost feedstock and economies of scale are secured.