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CFD modeling of gasification process in tapered fluidized bed gasifier

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  • Askaripour, Hossein

Abstract

This article presents a two-dimensional simulation of the coal gasification in tapered fluidized bed gasifier. The effects of tapered angle, gasifier temperature, velocity of gasifying agent, and steam-to-air ratio on the gas compositions, lower heating value (LHV), and higher heating value (HHV) were examined. In order to find the appropriate operating conditions of coal gasification, carbon conversion efficiency (CCE) and cold gas efficiency (CGE) were also explored. It was found that with an increase of the gasifier temperature, CCE and CGE of the tapered gasifier diminishes. Increasing tapered angle results in a decrease of the LHV and HHV of the gas products, whereas the CCE of gasification process increases. The CGE of the gasifier increases as the tapered angle goes up from 3 to 5°, but it slightly varies with a further increase of the tapered angle from 5 to 11°. The results indicate that as the velocity of gasifying agent increases, LHV and HHV of the product gas drop while CCE of the gasifier enhances. It was also found that the concentrations of H2, CO, and CO2 decrease with an increase in the steam-to-air ratio.

Suggested Citation

  • Askaripour, Hossein, 2020. "CFD modeling of gasification process in tapered fluidized bed gasifier," Energy, Elsevier, vol. 191(C).
    • Handle: RePEc:eee:energy:v:191:y:2020:i:c:s0360544219322108
    DOI: 10.1016/j.energy.2019.116515
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    References listed on IDEAS

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    1. Loha, Chanchal & Gu, Sai & De Wilde, Juray & Mahanta, Pinakeswar & Chatterjee, Pradip K., 2014. "Advances in mathematical modeling of fluidized bed gasification," Renewable and Sustainable Energy Reviews, Elsevier, vol. 40(C), pages 688-715.
    2. Couto, Nuno & Silva, Valter & Monteiro, Eliseu & Brito, Paulo & Rouboa, Abel, 2015. "Using an Eulerian-granular 2-D multiphase CFD model to simulate oxygen air enriched gasification of agroindustrial residues," Renewable Energy, Elsevier, vol. 77(C), pages 174-181.
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    Cited by:

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    2. Usmani, Sameer & Gonzalez Quiroga, Arturo & Vasquez Padilla, Ricardo & Palmer, Graeme & Lake, Maree, 2020. "Simulation model of the characteristics of syngas from hardwood biomass for thermally integrated gasification using unisim design tool," Energy, Elsevier, vol. 211(C).
    3. Fang, Yi & Paul, Manosh C. & Varjani, Sunita & Li, Xian & Park, Young-Kwon & You, Siming, 2021. "Concentrated solar thermochemical gasification of biomass: Principles, applications, and development," Renewable and Sustainable Energy Reviews, Elsevier, vol. 150(C).
    4. Wan, Zhanghao & Hu, Jianhang & Qi, Xianjin, 2021. "Numerical analysis of hydrodynamics and thermochemical property of biomass gasification in a pilot-scale circulating fluidized bed," Energy, Elsevier, vol. 225(C).
    5. Zhang, Fengxia & Yang, Shiliang & Yang, Bin & Wang, Hua, 2022. "Mesoscale bubble dynamics in the gasifier of a 1MWth dual fluidized bed gasifier for biomass gasification," Energy, Elsevier, vol. 238(PB).

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