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CFD modelling of coal gasification in a fluidized bed with the effects of calcination under different operating conditions

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  • Diba, Mst Farhana
  • Karim, Md Rezwanul
  • Naser, Jamal

Abstract

This paper investigates the thermochemical and physical conversion processes of coal gasification numerically with particular interest on calcination in a bubbling fluidized bed furnace. A comprehensive Eulerian-Eulerian three-dimensional model is developed for studying the gasification process. Three calcination cases are carried out under different operating conditions while one inert case is conducted to evaluate the effect of calcination. The presented numerical results aim at determining the mechanism of coal gasification in an air-steam environment with different flowrates. Evidence of particle segregation is found in the bed of coal and limestone due to density reduction and diameter shrinkage. Char conversion is investigated for different air-coal and steam-coal ratios, also the effect of bed temperature, fluid flowrate and fuel feeding rate on the carbon conversion is studied comprehensively. The highest char conversion rate is observed in the airflow rate of 17.0 kg/h where the bed temperature is found to be maximum. A noticeable impact of calcination is found in the gaseous emission while increasing CO2 concentration. Time averaged solid and gas temperature and species concentration profiles indicate the steady-state condition of numerical simulation.

Suggested Citation

  • Diba, Mst Farhana & Karim, Md Rezwanul & Naser, Jamal, 2022. "CFD modelling of coal gasification in a fluidized bed with the effects of calcination under different operating conditions," Energy, Elsevier, vol. 239(PC).
    • Handle: RePEc:eee:energy:v:239:y:2022:i:pc:s0360544221025329
    DOI: 10.1016/j.energy.2021.122284
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    References listed on IDEAS

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    1. Karim, Md Rezwanul & Bhuiyan, Arafat Ahmed & Sarhan, Abd Alhamid Rafea & Naser, Jamal, 2020. "CFD simulation of biomass thermal conversion under air/oxy-fuel conditions in a reciprocating grate boiler," Renewable Energy, Elsevier, vol. 146(C), pages 1416-1428.
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    1. Thoharudin, & Hsiau, Shu-San & Chen, Yi-Shun & Yang, Shouyin, 2023. "Design optimization of fluidized bed pyrolysis for energy and exergy analysis using a simplified comprehensive multistep kinetic model," Energy, Elsevier, vol. 276(C).
    2. Sunel Kumar & Zhihua Wang & Yong He & Yanqun Zhu & Kefa Cen, 2022. "Numerical Analysis for Coal Gasification Performance in a Lab-Scale Gasifier: Effects of the Wall Temperature and Oxygen/Coal Ratio," Energies, MDPI, vol. 15(22), pages 1-15, November.

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