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LES and RANS modeling of pulverized coal combustion in swirl burner for air and oxy-combustion technologies

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  • Warzecha, Piotr
  • Boguslawski, Andrzej

Abstract

Combustion of pulverized coal in oxy-combustion technology is one of the effective ways to reduce the emission of greenhouse gases into the atmosphere. The process of transition from conventional combustion in air to the oxy-combustion technology, however, requires a thorough investigations of the phenomena occurring during the combustion process, that can be greatly supported by numerical modeling. The paper presents the results of numerical simulations of pulverized coal combustion process in swirl burner using RANS (Reynolds-averaged Navier–Stokes equations) and LES (large Eddy simulation) methods for turbulent flow. Numerical simulations have been performed for the oxyfuel test facility located at the Institute of Heat and Mass Transfer at RWTH Aachen University. Detailed analysis of the flow field inside the combustion chamber for cold flow and for the flow with combustion using different numerical methods for turbulent flows have been done. Comparison of the air and oxy-coal combustion process for pulverized coal shows significant differences in temperature, especially close to the burner exit. Additionally the influence of the combustion model on the results has been shown for oxy-combustion test case.

Suggested Citation

  • Warzecha, Piotr & Boguslawski, Andrzej, 2014. "LES and RANS modeling of pulverized coal combustion in swirl burner for air and oxy-combustion technologies," Energy, Elsevier, vol. 66(C), pages 732-743.
    • Handle: RePEc:eee:energy:v:66:y:2014:i:c:p:732-743
    DOI: 10.1016/j.energy.2013.12.015
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