NDLI: Numerical Simulation of Pulverized Coal MILD Combustion Using a New Heterogeneous Combustion Submodel

Content Provider	Springer Nature Link
Author	Vascellari, Michele Schulze, Sebastian Nikrityuk, Petr Safrov, Dmitry Hasse, Christian
Copyright Year	2013
Abstract	The scope of this investigation is the application and analysis of a recently developed submodel (Schulze et al., Oil Gas Science Technol, 2013, doi: 10.2516/ogst/2012069 ) for char particle combustion and gasification. The distinguishing feature of this model is a detailed representation of the diffusion and convection processes as well as the homogeneous reactions in the boundary layer around the char particle. These processes are fully coupled to the heterogeneous particle kinetics. The model was implemented into the CFD code ANSYS-Fluent. The coupled solver is used for simulating the IFRF full scale pulverized coal combustion MILD furnace, for which detailed experimental data are available for model evaluation (Orsino et al., IFRF Doc. No F46/y/3, 2000) The new model yields improved agreement with measured data as compared to the standard modeling approach. This can be directly related to the prediction of the char burnout rate. For further analysis, the mixing field in the IFRF furnace is investigated in detail by introducing four mixture fractions for pyrolysis products, char burn-off gases, primary and secondary air, respectively. The solutions of the respective transport equations are used to define the local stoichiometry both in the gas phase and on the particle surface in such a multi-stream system. The conditions in the particle surrounding gas phase as well as on the particle surface are used to define the regime of particle-gas interaction based on the simulations with the new submodel. It can be shown that for certain conditions the homogeneous reactions in the particle boundary must be accounted for.
Starting Page	319
Ending Page	345
Page Count	27
File Format	PDF
ISSN	13866184
Journal	Flow, Turbulence and Combustion
Volume Number	92
Issue Number	1-2
e-ISSN	15731987
Language	English
Publisher	Springer Netherlands
Publisher Date	2013-06-07
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	CFD Coal Combustion MILD Char burnout Subgrid model Engineering Fluid Dynamics Fluid- and Aerodynamics Engineering Thermodynamics, Heat and Mass Transfer Automotive Engineering
Content Type	Text
Resource Type	Article
Subject	Physics and Astronomy Physical and Theoretical Chemistry Chemical Engineering

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