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Oxy-coal combustion in an entrained flow reactor: Application of specific char and volatile combustion and radiation models for oxy-firing conditions
| Content Provider | Semantic Scholar |
|---|---|
| Author | Alvarez, Laurent Yin, Chungen Riaza, Juan Pevida, Covadonga Rubiera, Fernando Murillo |
| Copyright Year | 2013 |
| Abstract | The deployment of oxy-fuel combustion in utility boilers is one of the major options for CO2 capture. However, combustion under oxy-firing conditions differs from conventional air-firing combustion, e.g., in the aspect of radiative heat transfer, coal conversion and pollutants formation. In this work, a numerical study on pulverised coal combustion was conducted to verify the applicability and accuracy of several sub-models refined for oxy-fuel conditions, e.g., gaseous radiative property model, gas-phase combustion mechanism and heterogeneous char reaction model. The sub-models were implemented in CFD (Computational Fluid Dynamics) simulations of combustion of three coals under air-firing and various oxy-firing (21–35% vol O2 in O2/CO2 mixture) conditions in an EFR (entrained flow reactor). The predicted coal burnouts and gaseous emissions were compared against experimental results. A good agreement between the simulations and experiments was achieved, indicating a good applicability and reliability of the refined sub-models and suitability of use of the experimentally derived kinetic data in coal devolatilisation and char oxidation sub-models. The sub-models and the practices implemented in this work can be used in large-scale oxy-fuel combustion processes for reliable design and optimization. |
| Starting Page | 255 |
| Ending Page | 268 |
| Page Count | 14 |
| File Format | PDF HTM / HTML |
| DOI | 10.1016/j.energy.2013.08.063 |
| Volume Number | 62 |
| Alternate Webpage(s) | http://digital.csic.es/bitstream/10261/103099/1/Oxy-coal_Alvarez.pdf |
| Alternate Webpage(s) | https://doi.org/10.1016/j.energy.2013.08.063 |
| Language | English |
| Access Restriction | Open |
| Content Type | Text |
| Resource Type | Article |
