Modeling Effects of Annealing on Coal Char Reactivity to O2 and CO2 , Based on Preparation Conditions
Oxy-fired coal combustion is a promising potential carbon capture technology. Predictive CFD simulations are valuable tools in evaluating and deploying oxy-fuel and other carbon capture technologies either as retrofit technologies or for new construction. However, accurate predictive combustor simulations require physically realistic submodels with low computational requirements. A recent sensitivity analysis of a detailed char conversion model (Char Conversion Kinetics (CCK)) found thermal annealing to be an extremely sensitive submodel. In the present work, further analysis of the previous annealing model revealed significant disagreement with numerous data sets from experiments performed after that annealing model was developed. The annealing model was accordingly extended to reflect experimentally observed reactivity loss due to thermal annealing of a variety of coals in diverse char preparation conditions. The model extension was informed by a Bayesian calibration analysis. Additionally, because oxy-fuel conditions include extraordinarily high levels of CO2, development of a first-ever CO2 reactivity loss model due to annealing is presented.
- Research Organization:
- Los Alamos National Lab. (LANL), Los Alamos, NM (United States); Univ. of Utah, Salt Lake City, UT (United States)
- Sponsoring Organization:
- USDOE National Nuclear Security Administration (NNSA)
- Contributing Organization:
- Los Alamos National Laboratory
- Grant/Contract Number:
- AC52-06NA25396; NA0002375
- OSTI ID:
- 1438106
- Alternate ID(s):
- OSTI ID: 1582443
- Report Number(s):
- LA-UR-17-22587
- Journal Information:
- Energy and Fuels, Vol. 31, Issue 10; ISSN 0887-0624
- Publisher:
- American Chemical Society (ACS)Copyright Statement
- Country of Publication:
- United States
- Language:
- English
Web of Science
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