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Large Eddy Simulation of a Novel Gas-Assisted Coal Combustion Chamber

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Abstract

In this work a recently presented combustion chamber that is specifically designed for the investigation of gas-assisted coal combustion and the validation of models is simulated under reactive conditions for the first time. In the configuration coal combustion is assisted and stabilized by a methane flame. In the course of the investigation, the configuration’s complexity is increased successively. Results of the isothermal single-phase flow are discussed first. Subsequently, reproducibility of the single-phase methane flame by means of the applied modeling approach is evaluated. In a further step, coal particles having the same thermal power as the methane flame are injected into the configuration. Particle histories, the conversion of the coal particles as well as its retroactive effect on the gas phase are investigated. Experimental results based on laser diagnostics are provided for all operating points and used for comparison with numerical results. Gas phase velocity fields for all operating points are available. In order to identify the reaction in the reactive single-phase case planar laser induced fluorescence of the OH-radical (OH-PLIF) was applied. Overall good agreement between numerical and experimental results could be obtained. In the Large Eddy Simulation (LES) a Flamelet Generated Manifold (FGM) based model is utilized. The four-dimensional manifold is spanned by two mixture fractions, a reaction progress variable and the enthalpy on which the gas phase chemistry gets mapped onto. Thereby, the model accounts for both, volatiles reaction and char conversion. Furthermore, finite rate chemistry effects as well as non-adiabatic physics are considered.

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Acknowledgements

The authors kindly acknowledge financial support through Deutsche Forschungsgemeinschaft (DFG) through SFB/TRR 129. Computations were performed on the Lichtenberg High Performance Computer in Darmstadt.

Funding

This study was funded by Deutsche Forschungsgemeinschaft (SFB/TRR 129).

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Authors and Affiliations

  1. Institute for Energy and Powerplant Technology, Otto-Berndt-Straße 3, 64287, Darmstadt, Germany

    Robert Knappstein, Guido Kuenne, Amsini Sadiki & Johannes Janicka

  2. Institute for Reactive Flows and Diagnostics, Otto-Berndt-Straße 3, 64287, Darmstadt, Germany

    Lukas G. Becker & Andreas Dreizler

  3. Chair for Thermal Turbomachines and Aircraft Engines, Universitätsstraße 150, 44801, Bochum, Germany

    Francesca di Mare

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  1. Robert Knappstein
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  2. Guido Kuenne
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  5. Amsini Sadiki
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  7. Johannes Janicka
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Knappstein, R., Kuenne, G., Becker, L.G. et al. Large Eddy Simulation of a Novel Gas-Assisted Coal Combustion Chamber. Flow Turbulence Combust 101, 895–926 (2018). https://doi.org/10.1007/s10494-018-9910-x

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