On the Influence of Kinetic Uncertainties on the Accuracy of Numerical Modeling of an Industrial Flameless Furnace Fired With NH3/H2 Blends: A Numerical and Experimental Study
Ammonia/hydrogen-fueled combustion represents a very promising solution for the future energy scenario. This study aims to shed light and understand the behavior of ammonia/hydrogen blends under flameless conditions. A first-of-its-kind experimental campaign was conducted to test fuel flexibility fo...
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| Format: | Article |
| Language: | English |
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Frontiers Media S.A.
2020-12-01
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| Series: | Frontiers in Energy Research |
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| Online Access: | https://www.frontiersin.org/articles/10.3389/fenrg.2020.597655/full |
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| author | Marco Ferrarotti Marco Ferrarotti Marco Ferrarotti Andrea Bertolino Andrea Bertolino Andrea Bertolino Ruggero Amaduzzi Ruggero Amaduzzi Alessandro Parente Alessandro Parente |
| author_facet | Marco Ferrarotti Marco Ferrarotti Marco Ferrarotti Andrea Bertolino Andrea Bertolino Andrea Bertolino Ruggero Amaduzzi Ruggero Amaduzzi Alessandro Parente Alessandro Parente |
| author_sort | Marco Ferrarotti |
| collection | DOAJ |
| description | Ammonia/hydrogen-fueled combustion represents a very promising solution for the future energy scenario. This study aims to shed light and understand the behavior of ammonia/hydrogen blends under flameless conditions. A first-of-its-kind experimental campaign was conducted to test fuel flexibility for different ammonia/hydrogen blends in a flameless burner, varying the air injector and the equivalence ratio. NO emissions increased drastically after injecting a small amount of NH3 in pure hydrogen (10% by volume). An optimum trade-off between NOx emission and ammonia slip was found when working sufficiently close to stoichiometric conditions (ϕ = 0.95). In general, a larger air injector (ID25) reduces the emissions, especially at ϕ = 0.8. A well-stirred reactor network with exhaust recirculation was developed exchanging information with computational fluid dynamics (CFD) simulations, to model chemistry in diluted conditions. Such a simplified system was then used in two ways: 1) to explain the experimental trends of NOx emissions varying the ammonia molar fraction within the fuel blend and 2) to perform an uncertainty quantification study. A sensitivity study coupled with latin hypercube sampling (LHS) was used to evaluate the impact of kinetic uncertainties on NOx prediction in a well-stirred reactor network model. The influence of the identified uncertainties was then tested in more complex numerical models, such as Reynolds-averaged Navier–Stokes (RANS) simulations of the furnace. The major over-predictions of existing kinetic scheme was then alleviated significantly, confirming the crucial role of detailed kinetic mechanisms for accurate predictive simulations of NH3/H2 mixtures in flameless regime. |
| first_indexed | 2024-12-22T12:30:55Z |
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| institution | Directory Open Access Journal |
| issn | 2296-598X |
| language | English |
| last_indexed | 2024-12-22T12:30:55Z |
| publishDate | 2020-12-01 |
| publisher | Frontiers Media S.A. |
| record_format | Article |
| series | Frontiers in Energy Research |
| spelling | doaj.art-8154a15fdf9544b58407254df9e4a8e62022-12-21T18:25:40ZengFrontiers Media S.A.Frontiers in Energy Research2296-598X2020-12-01810.3389/fenrg.2020.597655597655On the Influence of Kinetic Uncertainties on the Accuracy of Numerical Modeling of an Industrial Flameless Furnace Fired With NH3/H2 Blends: A Numerical and Experimental StudyMarco Ferrarotti0Marco Ferrarotti1Marco Ferrarotti2Andrea Bertolino3Andrea Bertolino4Andrea Bertolino5Ruggero Amaduzzi6Ruggero Amaduzzi7Alessandro Parente8Alessandro Parente9Aero-Thermo-Mechanics Laboratory, Université Libre de Bruxelles, Ecole Polytechnique de Bruxelles, Bruxelles, BelgiumUniversité Libre de Bruxelles and Vrije Universiteit Brussel, Combustion and Robust Optimization Group (BURN), Bruxelles, BelgiumThermal Engineering and Combustion Unit, University of Mons (UMONS), Mons, BelgiumAero-Thermo-Mechanics Laboratory, Université Libre de Bruxelles, Ecole Polytechnique de Bruxelles, Bruxelles, BelgiumUniversité Libre de Bruxelles and Vrije Universiteit Brussel, Combustion and Robust Optimization Group (BURN), Bruxelles, BelgiumDepartment of Chemistry, Materials, and Chemical Engineering “G. Natta”, Politecnico di Milano, Milano, ItalyAero-Thermo-Mechanics Laboratory, Université Libre de Bruxelles, Ecole Polytechnique de Bruxelles, Bruxelles, BelgiumUniversité Libre de Bruxelles and Vrije Universiteit Brussel, Combustion and Robust Optimization Group (BURN), Bruxelles, BelgiumAero-Thermo-Mechanics Laboratory, Université Libre de Bruxelles, Ecole Polytechnique de Bruxelles, Bruxelles, BelgiumUniversité Libre de Bruxelles and Vrije Universiteit Brussel, Combustion and Robust Optimization Group (BURN), Bruxelles, BelgiumAmmonia/hydrogen-fueled combustion represents a very promising solution for the future energy scenario. This study aims to shed light and understand the behavior of ammonia/hydrogen blends under flameless conditions. A first-of-its-kind experimental campaign was conducted to test fuel flexibility for different ammonia/hydrogen blends in a flameless burner, varying the air injector and the equivalence ratio. NO emissions increased drastically after injecting a small amount of NH3 in pure hydrogen (10% by volume). An optimum trade-off between NOx emission and ammonia slip was found when working sufficiently close to stoichiometric conditions (ϕ = 0.95). In general, a larger air injector (ID25) reduces the emissions, especially at ϕ = 0.8. A well-stirred reactor network with exhaust recirculation was developed exchanging information with computational fluid dynamics (CFD) simulations, to model chemistry in diluted conditions. Such a simplified system was then used in two ways: 1) to explain the experimental trends of NOx emissions varying the ammonia molar fraction within the fuel blend and 2) to perform an uncertainty quantification study. A sensitivity study coupled with latin hypercube sampling (LHS) was used to evaluate the impact of kinetic uncertainties on NOx prediction in a well-stirred reactor network model. The influence of the identified uncertainties was then tested in more complex numerical models, such as Reynolds-averaged Navier–Stokes (RANS) simulations of the furnace. The major over-predictions of existing kinetic scheme was then alleviated significantly, confirming the crucial role of detailed kinetic mechanisms for accurate predictive simulations of NH3/H2 mixtures in flameless regime.https://www.frontiersin.org/articles/10.3389/fenrg.2020.597655/fulluncertainty propagationammoniahydrogenflamelesspartially stirred reactor |
| spellingShingle | Marco Ferrarotti Marco Ferrarotti Marco Ferrarotti Andrea Bertolino Andrea Bertolino Andrea Bertolino Ruggero Amaduzzi Ruggero Amaduzzi Alessandro Parente Alessandro Parente On the Influence of Kinetic Uncertainties on the Accuracy of Numerical Modeling of an Industrial Flameless Furnace Fired With NH3/H2 Blends: A Numerical and Experimental Study Frontiers in Energy Research uncertainty propagation ammonia hydrogen flameless partially stirred reactor |
| title | On the Influence of Kinetic Uncertainties on the Accuracy of Numerical Modeling of an Industrial Flameless Furnace Fired With NH3/H2 Blends: A Numerical and Experimental Study |
| title_full | On the Influence of Kinetic Uncertainties on the Accuracy of Numerical Modeling of an Industrial Flameless Furnace Fired With NH3/H2 Blends: A Numerical and Experimental Study |
| title_fullStr | On the Influence of Kinetic Uncertainties on the Accuracy of Numerical Modeling of an Industrial Flameless Furnace Fired With NH3/H2 Blends: A Numerical and Experimental Study |
| title_full_unstemmed | On the Influence of Kinetic Uncertainties on the Accuracy of Numerical Modeling of an Industrial Flameless Furnace Fired With NH3/H2 Blends: A Numerical and Experimental Study |
| title_short | On the Influence of Kinetic Uncertainties on the Accuracy of Numerical Modeling of an Industrial Flameless Furnace Fired With NH3/H2 Blends: A Numerical and Experimental Study |
| title_sort | on the influence of kinetic uncertainties on the accuracy of numerical modeling of an industrial flameless furnace fired with nh3 h2 blends a numerical and experimental study |
| topic | uncertainty propagation ammonia hydrogen flameless partially stirred reactor |
| url | https://www.frontiersin.org/articles/10.3389/fenrg.2020.597655/full |
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