Quantifying the effect of CO2 gasification on pulverized coal char oxy-fuel combustion

Shaddix, Christopher R.; Hecht, Ethan S.; Gonzalo-Tirado, Cristina; Haynes, Brian S.

doi:10.1016/j.proci.2022.07.122

Title: Quantifying the effect of CO₂ gasification on pulverized coal char oxy-fuel combustion

Journal Article · Fri Sep 09 00:00:00 EDT 2022 · Proceedings of the Combustion Institute

DOI:https://doi.org/10.1016/j.proci.2022.07.122· OSTI ID:1889105

^[1]; Hecht, Ethan S. ^[1]; Gonzalo-Tirado, Cristina ^[2];

^[3]

Sandia National Laboratory (SNL-CA), Livermore, CA (United States)
Sandia National Laboratory (SNL-CA), Livermore, CA (United States); Delegation of Government of Aragón, Zaragoza (Spain)
University of Sydney, NSW (Australia)

Previous research has provided strong evidence that CO₂ and H₂O gasification reactions can provide non-negligible contributions to the consumption rates of pulverized coal (pc) char during combustion, particularly in oxy-fuel environments. Fully quantifying the contribution of these gasification reactions has proven to be difficult, due to the dearth of knowledge of gasification rates at the elevated particle temperatures associated with typical pc char combustion processes, as well as the complex interaction of oxidation and gasification reactions. Gasification reactions tend to become more important at higher char particle temperatures (because of their high activation energy) and they tend to reduce pc oxidation due to their endothermicity (i.e. cooling effect). The work reported here attempts to quantify the influence of the gasification reaction of CO₂ in a rigorous manner by combining experimental measurements of the particle temperatures and consumption rates of size-classified pc char particles in tailored oxy-fuel environments with simulations from a detailed reacting porous particle model. The results demonstrate that a specific gasification reaction rate relative to the oxidation rate (within an accuracy of approximately +/- 20% of the pre-exponential value), is consistent with the experimentally measured char particle temperatures and burnout rates in oxy-fuel combustion environments. Conversely, the results also show, in agreement with past calculations, that it is extremely difficult to construct a set of kinetics that does not substantially overpredict particle temperature increase in strongly oxygen-enriched N2 environments. This latter result is believed to result from deficiencies in standard oxidation mechanisms that fail to account for falloff in char oxidation rates at high temperatures.

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Research Organization:: Sandia National Lab. (SNL-CA), Livermore, CA (United States)

Sponsoring Organization:: USDOE Office of Fossil Energy (FE), Clean Coal and Carbon Management; USDOE National Nuclear Security Administration (NNSA)

Grant/Contract Number:: NA0003525; NA-0003525

OSTI ID:: 1889105

Alternate ID(s):: OSTI ID: 1984118

Report Number(s):: SAND2022-11453J; 709291

Journal Information:: Proceedings of the Combustion Institute, Vol. 39, Issue 3; ISSN 1540-7489

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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