Mathematical Modeling of Multi-Phenomena Anisotropic Systems: Ejection of Primary Aerosols during the Fast Pyrolysis of Biomass

Mario A. Sánchez (), Juan C. Maya, Farid Chejne, Brennan Pecha and Adriana M. Quinchía-Figueroa
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Mario A. Sánchez: Escuela de Ingeniería y Ciencias Básicas, Universidad EIA, Envigado 055428, Colombia
Juan C. Maya: Departamento de Procesos y Energía, Facultad de Minas, Universidad Nacional de Colombia Sede Medellín, Medellín 050034, Colombia
Farid Chejne: Departamento de Procesos y Energía, Facultad de Minas, Universidad Nacional de Colombia Sede Medellín, Medellín 050034, Colombia
Brennan Pecha: Renewable Resources and Enabling Sciences Center, National Renewable Energy Laboratory (NREL), Golden, CO 15013, USA
Adriana M. Quinchía-Figueroa: Escuela de Ingeniería y Ciencias Básicas, Universidad EIA, Envigado 055428, Colombia

Mathematics, 2024, vol. 12, issue 6, 1-14

Abstract: This study introduces a novel particle model for biomass fast pyrolysis, incorporating an anisotropic cylindrical particle to address mass and energy transport coupled with aerosol ejection, which previous models have overlooked. The main contribution lies in developing a model that considers aerosol generation in anisotropic cylindrical particles for the first time, addressing bubbling dynamics and bursting within the liquid phase. The population balance equation describes bubble dynamics and aerosol formation, capturing phenomena like nucleation, growth, coalescence, and bursting. The model employs the method of moments with bubble volume as an internal variable, substantially reducing computational costs by eliminating dependence on this variable. Results highlight the significant impact of anisotropy and particle size on aerosol ejection: smaller, less elongated particles experience faster heating, quicker conversion, and the increased accumulation of the liquid intermediate phase. Specifically, 1 mm diameter particles yield higher concentrations of metaplast and bio-oil aerosols, exceeding 15%, compared to concentrations below 11% for 3 mm particles. This model provides insights into aerosol structure (volume, surface area), aiding in understanding aerosol reactivity at the reactor scale.

Keywords: pyrolysis; biomass; single particle model; aerosols; liquid intermediate; population balance (search for similar items in EconPapers)
JEL-codes: C (search for similar items in EconPapers)
Date: 2024
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