Three-dimensional modeling study of the oxy-fuel co-firing of coal and biomass in a bubbling fluidized bed

Mengmeng Zhou, Shuai Wang, Kun Luo and Jianren Fan

Energy, 2022, vol. 247, issue C

Abstract: In this work, the co-firing of biomass and coal in an oxy-fuel bubbling fluidized bed combustor is numerically explored using a multiphase particle-in-cell reactive model. After model validation, the complex in-furnace phenomena and thermochemical properties are thoroughly studied. The results show that the lateral injection of solid fuels and secondary gas flow results in the non-uniform distributions of gas-solid fluxes and gas products. Segregation makes sand particles concentrate in the bottom region. Particle mass decreases axially, corresponding to the coal in the medium region and biomass in the upper region. Higher oxygen concentration leads to higher gas temperature and lower gas density attributed to the enhanced oxidation reactions. Elevating superficial gas velocity causes a lower gas temperature, higher gas density, lower CO2 and H2O concentrations because of the reduced residence time of gas-solid flow. A larger portion of primary gas flow causes the reduced O2 concentration, increased H2O concentration, but unchanged CO2 concentration in the lower region.

Keywords: Oxy-fuel combustion; Biomass and coal; Bubbling fluidized bed; Numerical simulation; Co-combustion (search for similar items in EconPapers)
Date: 2022
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (4)

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Persistent link: https://EconPapers.repec.org/RePEc:eee:energy:v:247:y:2022:i:c:s0360544222003991

DOI: 10.1016/j.energy.2022.123496

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