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

McConnell, Josh; Goshayeshi, Babak; Sutherland, James C.

doi:10.1016/j.fuel.2016.11.052

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

Journal Article · Mon Nov 21 23:00:00 EST 2016 · Fuel

DOI:https://doi.org/10.1016/j.fuel.2016.11.052· OSTI ID:1362068

McConnell, Josh ^[1]; Goshayeshi, Babak ^[2]; Sutherland, James C. ^[2]

Univ. of Utah, Salt Lake City, UT (United States). Dept. of Chemical Engineering; UNIVERSITY OF UTAH
Univ. of Utah, Salt Lake City, UT (United States). Dept. of Chemical Engineering

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 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 O₂ concentrations as well as coal types. A significant overlap in devolatilization and char consumption is observed for both char chemistry and devolatilization models.

View Accepted Manuscript (DOE)

Research Organization:: Univ. of Utah, Salt Lake City, UT (United States)

Sponsoring Organization:: USDOE National Nuclear Security Administration (NNSA)

Grant/Contract Number:: NA0002375

OSTI ID:: 1362068

Report Number(s):: DOE-UTAH-DENA--0002375-SUTHERLAND-11; PII: S001623611631153X

Journal Information:: Fuel, Journal Name: Fuel Journal Issue: C Vol. 201; ISSN 0016-2361

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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