Abstract
In this work, the process of combustion of coal particles under turbulent regime in a high-temperature reaction chamber is modeled through 3D discrete element method (DEM) simulations. By assuming the occurrence of interfacial transport phenomena between the gas and solid phases, one investigates the influence of the physicochemical properties of particles on the rates of heterogeneous chemical reactions, as well as the influence of eddies present in the gas phase on the mass transport of reactants toward the coal particles surface. Moreover, by considering a simplistic chemical mechanism for the combustion process, thermochemical and kinetic parameters obtained from the simulations are employed to discuss some phenomenological aspects of the combustion process. In particular, the observed changes in the mass and volume of coal particles during the gasification and combustion steps are discussed by emphasizing the changes in the chemical structure of the coal. In addition to illustrate how DEM simulations can be used in the modeling of consecutive and parallel chemical reactions, this work also shows how heterogeneous and homogeneous chemical reactions become a source of mass and energy for the gas phase.
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The first author acknowledges Brazilian Coordination for the Improvement of Higher Education Personnel (CAPES) and Alexander von Humboldt Stiftung for the financial support (Process BEX 8227/14-4).
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Reis, M.C., Alobaid, F. & Wang, Y. Toward the modeling of combustion reactions through discrete element method (DEM) simulations. Comp. Part. Mech. 5, 579–591 (2018). https://doi.org/10.1007/s40571-018-0191-x
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DOI: https://doi.org/10.1007/s40571-018-0191-x