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Exergy Assessment of the Allothermal Gasification of Maize Cobs in a Concentric Tube Fixed-Bed Reactor

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  • Jesús D. Rhenals-Julio

    (Departamento de Ingeniería Mecánica, Universidad de Córdoba, Cr 6 # 76-103, Montería 230002, Colombia
    Department of Mechanical Engineering, Universidad del Norte, Km. 5 Vía Puerto Colombia, Barranquilla 081007, Colombia)

  • Jorge M. Mendoza

    (Departamento de Ingeniería Mecánica, Universidad de Córdoba, Cr 6 # 76-103, Montería 230002, Colombia)

  • Andrés F. Jaramillo

    (Departamento de Ingeniería Mecánica, Universidad de Córdoba, Cr 6 # 76-103, Montería 230002, Colombia
    Centro de Manejo de Residuos y Bioenergía, Núcleo Científico y Tecnológico en Biorecursos (BIOREN-UFRO) Universidad de La Frontera, 01145 Francisco Salazar, Temuco 4780000, Chile)

  • Alexis Sagastume Gutiérrez

    (Department of Civil Engineering, Facultad de Estudios a Distancia, Universidad Militar Nueva Granada, Cajicá 250247, Colombia)

  • Antonio Bula Silvera

    (Department of Mechanical Engineering, Universidad del Norte, Km. 5 Vía Puerto Colombia, Barranquilla 081007, Colombia)

Abstract

An exergy analysis of maize cob gasification in a concentric tube fixed-bed reactor was conducted to define the relationship between biomass in the combustion and gasification zones. Biomass exergy was estimated based on its elemental composition, and syngas was treated as an ideal gas. The results show a linear correlation between temperature and the mass ratio in both the combustion and gasification zones. The optimum exergy efficiency was 68.2% at a mass ratio of 2. Most irreversibilities were found in the combustion zone, with 42.9 kJ/kg destroyed, compared to 33.7 kJ/kg in the gasification zone. It is concluded that the allothermal gasification of biomass in two-zone gasifiers with concentric tubes improves the syngas LHV, demonstrating good reactor performance.

Suggested Citation

  • Jesús D. Rhenals-Julio & Jorge M. Mendoza & Andrés F. Jaramillo & Alexis Sagastume Gutiérrez & Antonio Bula Silvera, 2025. "Exergy Assessment of the Allothermal Gasification of Maize Cobs in a Concentric Tube Fixed-Bed Reactor," Energies, MDPI, vol. 18(3), pages 1-16, January.
    • Handle: RePEc:gam:jeners:v:18:y:2025:i:3:p:606-:d:1578774
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    References listed on IDEAS

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