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Title: An evaluation of the efficacy of various coal combustion models for predicting char burnout

Coal combustion is comprised of several subprocesses including devolatilization and heterogeneous reactions of the coal char with O 2, CO 2, H 2O and potentially several other species. Much effort has been put forth to develop models for these processes which vary widely in both complexity and computational cost. This work investigates the efficacy of models for devolatilization and char reactions at either end of the complexity and cost spectrums for a range of particle sizes and furnace temperatures and across coal types. The overlap of simulated devolatilization and char consumption is also examined. In the gas phase, a detailed kinetics model based on a reduced version of the GRI 3.0 mechanism is used. The Char Conversion Kinetics and an n th-order Langmuir-Hinshelwood models are considered for char oxidation. The Chemical Percolation and Devolatilization and a two-step model are considered for devolatilization. Results indicate that high-fidelity models perform better at representing particle temperature and mass data across a wide range of O 2 concentrations as well as coal types. A significant overlap in devolatilization and char consumption is observed for both char chemistry and devolatilization models.
Authors:
 [1] ;  [1] ;  [1]
  1. Univ. of Utah, Salt Lake City, UT (United States). Dept. of Chemical Engineering
Publication Date:
Report Number(s):
DOE-UTAH-DENA-0002375-SUTHERLAND-11
Journal ID: ISSN 0016-2361; PII: S001623611631153X
Grant/Contract Number:
NA0002375
Type:
Accepted Manuscript
Journal Name:
Fuel
Additional Journal Information:
Journal Volume: 201; Journal Issue: C; Journal ID: ISSN 0016-2361
Publisher:
Elsevier
Research Org:
Univ. of Utah, Salt Lake City, UT (United States)
Sponsoring Org:
USDOE National Nuclear Security Administration (NNSA)
Country of Publication:
United States
Language:
English
Subject:
01 COAL, LIGNITE, AND PEAT; Combustion;  Coal;  Simulation;  Char oxidation
OSTI Identifier:
1362068
Alternate Identifier(s):
OSTI ID: 1413372

McConnell, Josh, Goshayeshi, Babak, and Sutherland, James C. An evaluation of the efficacy of various coal combustion models for predicting char burnout. United States: N. p., Web. doi:10.1016/j.fuel.2016.11.052.
McConnell, Josh, Goshayeshi, Babak, & Sutherland, James C. An evaluation of the efficacy of various coal combustion models for predicting char burnout. United States. doi:10.1016/j.fuel.2016.11.052.
McConnell, Josh, Goshayeshi, Babak, and Sutherland, James C. 2016. "An evaluation of the efficacy of various coal combustion models for predicting char burnout". United States. doi:10.1016/j.fuel.2016.11.052. https://www.osti.gov/servlets/purl/1362068.
@article{osti_1362068,
title = {An evaluation of the efficacy of various coal combustion models for predicting char burnout},
author = {McConnell, Josh and Goshayeshi, Babak and Sutherland, James C.},
abstractNote = {Coal combustion is comprised of several subprocesses including devolatilization and heterogeneous reactions of the coal char with O2, CO2, H2O and potentially several other species. Much effort has been put forth to develop models for these processes which vary widely in both complexity and computational cost. This work investigates the efficacy of models for devolatilization and char reactions at either end of the complexity and cost spectrums for a range of particle sizes and furnace temperatures and across coal types. The overlap of simulated devolatilization and char consumption is also examined. In the gas phase, a detailed kinetics model based on a reduced version of the GRI 3.0 mechanism is used. The Char Conversion Kinetics and an nth-order Langmuir-Hinshelwood models are considered for char oxidation. The Chemical Percolation and Devolatilization and a two-step model are considered for devolatilization. Results indicate that high-fidelity models perform better at representing particle temperature and mass data across a wide range of O2 concentrations as well as coal types. A significant overlap in devolatilization and char consumption is observed for both char chemistry and devolatilization models.},
doi = {10.1016/j.fuel.2016.11.052},
journal = {Fuel},
number = C,
volume = 201,
place = {United States},
year = {2016},
month = {11}
}