Numerical Simulation of Entrained-flow Coal Gasification: A Study on Particles History

Autor/innen

  • M.S. Alam Shahjalal University of Science & Technology, Bangladesh
  • A.T. Wijayanta Kyushu University, Japan
  • K. Nakaso Kyushu University, Japan
  • J Fukai Kyushu University, Japan

Schlagwörter:

particles history, numerical simulation, coal gasification, coal conversion

Abstract

Studies of coal particle history during coal gasification inside the gasifier are very limited. A comprehensive 3D numerical simulation of entrained-flow coal gasification is conducted. The Eulerian-Lagrangian approach is applied to solve the Navier-Stokes equations and the particle dynamics. The finite rate/eddy dissipation model is used to calculate the rate of gasgas phase reactions, whereas only finite rates are used for solid-gas phase reactions. Turbulence is calculated using the standard k–É› model; the radiation energy is calculated using the discrete ordinates model. The changes in coal particle history such as travelling path, conversion, and position are explained in detail. The calculated outlet species concentrations and centerline gas temperature are compared with those of experimental results. CO and H2 (syngas) were found produced mainly in the reductor during coal gasification, whereas a high-temperature gas with more CO2 and H2O is produced in the combustor. The behavior of combustor coal particles in coal gasification was found to differ significantly from that of reductor coal particles. The average path length for 70 µm particles in the combustor is very large (15.5 m) compared to the 10 µm particles (2.5 m).  Keywords: Particles history, numerical simulation, coal gasification, coal conversion Cite this Article M.S. Alam, A.T. Wijayanta, K. Nakaso, et al. Numerical Simulation of Entrained-flow Coal Gasification: A Study on Particles History. Journal of Energy Environment and Carbon Credits. 2016; 6(3): 9–18p. 

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Veröffentlicht

2017-01-17

Ausgabe

Bd. 6 Nr. 3 (2016)

Rubrik

Research Articles

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