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Modeling of downdraft gasification process: Studies on particle geometries in thermally thick regime

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  • Chaurasia, Ashish

Abstract

In this study, a downdraft gasifier model is coupled with a single-particle model to analyze the effects of particle geometries such as slab, cylindrical, and spherical on different parameters. Simulations were performed using particles in a thermally thick regime with larger particle sizes of 0.003–0.05 m, which are generally used in commercial gasifiers. This combination of the downdraft gasifier model and single particle model was implemented using Comsol Multiphysics software program. The results obtained are in good agreement with those of obtained in previous studies. The low thermal conductivity of biomass (kB), small particle size (dp), high gas temperature (Tg), higher molar fraction of oxygen in primary air (XO2), and high mass-transfer coefficient (km) favor the formation of carbon monoxide (CO), hydrogen (H2), high tar conversion, and higher lower heating value. To maximize the CO composition and tar conversion, the initial gas temperature (Tg) is more crucial. The least sensitive parameter is the thermal conductivity of biomass (kB) in relation to product composition of CO, carbon dioxide (CO2), H2, and methane (CH4). The sensitivity for all the parameters is found to be the highest for the spherical geometry and is least for the slab geometry.

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  • Chaurasia, Ashish, 2018. "Modeling of downdraft gasification process: Studies on particle geometries in thermally thick regime," Energy, Elsevier, vol. 142(C), pages 991-1009.
    • Handle: RePEc:eee:energy:v:142:y:2018:i:c:p:991-1009
    DOI: 10.1016/j.energy.2017.10.093
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    1. Chaurasia, Ashish, 2016. "Modeling, simulation and optimization of downdraft gasifier: Studies on chemical kinetics and operating conditions on the performance of the biomass gasification process," Energy, Elsevier, vol. 116(P1), pages 1065-1076.
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    1. Gautam, Neha & Chaurasia, Ashish, 2020. "Study on kinetics and bio-oil production from rice husk, rice straw, bamboo, sugarcane bagasse and neem bark in a fixed-bed pyrolysis process," Energy, Elsevier, vol. 190(C).
    2. Chaurasia, Ashish, 2020. "Modeling of downdraft gasification process: Part II - Studies on the effect of shrinking and non-shrinking biomass geometries on the performance of gasification process," Energy, Elsevier, vol. 207(C).
    3. Chaurasia, Ashish, 2019. "Modeling of downdraft gasification process: Part I - Studies on shrinkage effect on tabular, cylindrical and spherical geometries," Energy, Elsevier, vol. 169(C), pages 130-141.

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