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Modeling of downdraft gasification process: Part I - Studies on shrinkage effect on tabular, cylindrical and spherical geometries

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  • Chaurasia, Ashish

Abstract

This study investigates the effect of shrinkage on the heat-transfer-controlled processes of tabular (slab), cylindrical, and spherical geometries. A model is used to simulate the product yield, pyrolysis time, particle size, specific heat capacity, and Biot number for analyzing the effect of shrinkage on different geometries. Spherical, tabular, and cylindrical biomass briquettes with an equivalent diameter of 0.0002–0.1 m are used for simulation. The proposed model is validated using the experimental product yield data obtained from the two-stage gasifier in this study and the experimental data reported in the literature. Thermal waves are observed with an increase in particle size. The tabular geometry exhibits the maximum number of thermal waves, whereas the spherical geometry exhibits the least number of thermal waves. The shrinking effect favors the formation of volatiles and gases, whereas the nonshrinking effect favors the formation of char. The product yield remains unchanged with an increase in the specific heat capacity and Biot number. However, the production of volatiles and gases increases in the order sphere > cylinder > tabular, whereas the production of char increases in the order tabular > cylinder > sphere for the entire specific heat capacity range.

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  • 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.
    • Handle: RePEc:eee:energy:v:169:y:2019:i:c:p:130-141
    DOI: 10.1016/j.energy.2018.12.038
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    References listed on IDEAS

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    1. Mohammad I. Jahirul & Mohammad G. Rasul & Ashfaque Ahmed Chowdhury & Nanjappa Ashwath, 2012. "Biofuels Production through Biomass Pyrolysis —A Technological Review," Energies, MDPI, vol. 5(12), pages 1-50, November.
    2. 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.
    3. Chaurasia, Ashish, 2018. "Modeling of downdraft gasification process: Studies on particle geometries in thermally thick regime," Energy, Elsevier, vol. 142(C), pages 991-1009.
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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).

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