This work is devoted to the development and verification of a new intrinsic-based subgrid model for moving char particles gasifying in a hot flue gas or syngas environments consisting of CO2/H2O/CO species. The distinguishing feature of our model relative to the submodels published in the literature is that it takes into account the thermal and chemical nonequilibrium between the particle's surface and its center. Thus, our model is able to predict temperature and species gradients inside the particles. The main focus of the new submodel is to demonstrate the crucial role of intrinsic-based heterogeneous reactions in the adequate prediction of carbon conversion rates for char particles gasification in fixed-bed and fluidized-bed gasifiers. The new model is verified against steady-state, particle-resolved computational fluid dynamics (CFD)-based, three-dimensional simulations carried out for different volume fractions of solid phase in a control volume (CV). Acceptable agreement has been demonstrated. Finally, to demonstrate our new model's predictions, we carried out several unsteady simulations for different ambient temperatures and Reynolds numbers. The importance of simultaneous change of char porosity and particles size during gasification has been demonstrated for different regimes indicated by the Damköhler numbers.
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July 2016
Research-Article
A New Subgrid Model for the Heat and Mass Transfer Between a Hot Gas and Char Particles in Dense-Bed Reactors
S. Schulze,
S. Schulze
Institute of Energy Process Engineering and
Chemical Engineering,
Technische Universität Bergakademie Freiberg,
Fuchmühlenweg 9,
Freiberg 09596, Germany
Chemical Engineering,
Technische Universität Bergakademie Freiberg,
Fuchmühlenweg 9,
Freiberg 09596, Germany
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P. Nikrityuk
P. Nikrityuk
Associate Professor
Mem. ASME
Donadeo Innovation Centre for Engineering,
Department of Chemical and
Materials Engineering,
University of Alberta,
9211-116 Street,
Edmonton, AB T6G 1H9, Canada
e-mail: nikrityu@ualberta.ca
Mem. ASME
Donadeo Innovation Centre for Engineering,
Department of Chemical and
Materials Engineering,
University of Alberta,
9211-116 Street,
Edmonton, AB T6G 1H9, Canada
e-mail: nikrityu@ualberta.ca
Search for other works by this author on:
S. Schulze
Institute of Energy Process Engineering and
Chemical Engineering,
Technische Universität Bergakademie Freiberg,
Fuchmühlenweg 9,
Freiberg 09596, Germany
Chemical Engineering,
Technische Universität Bergakademie Freiberg,
Fuchmühlenweg 9,
Freiberg 09596, Germany
P. Nikrityuk
Associate Professor
Mem. ASME
Donadeo Innovation Centre for Engineering,
Department of Chemical and
Materials Engineering,
University of Alberta,
9211-116 Street,
Edmonton, AB T6G 1H9, Canada
e-mail: nikrityu@ualberta.ca
Mem. ASME
Donadeo Innovation Centre for Engineering,
Department of Chemical and
Materials Engineering,
University of Alberta,
9211-116 Street,
Edmonton, AB T6G 1H9, Canada
e-mail: nikrityu@ualberta.ca
1Corresponding author.
Contributed by the Advanced Energy Systems Division of ASME for publication in the JOURNAL OF ENERGY RESOURCES TECHNOLOGY. Manuscript received July 30, 2015; final manuscript received February 8, 2016; published online March 1, 2016. Assoc. Editor: Terry Wall.
J. Energy Resour. Technol. Jul 2016, 138(4): 042206 (7 pages)
Published Online: March 1, 2016
Article history
Received:
July 30, 2015
Revised:
February 8, 2016
Citation
Schulze, S., and Nikrityuk, P. (March 1, 2016). "A New Subgrid Model for the Heat and Mass Transfer Between a Hot Gas and Char Particles in Dense-Bed Reactors." ASME. J. Energy Resour. Technol. July 2016; 138(4): 042206. https://doi.org/10.1115/1.4032732
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