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Computational analysis of the effect of hydrogen peroxide addition on premixed laminar hydrogen/air flames

Tingas, Efstathios-Al.

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Abstract

In the current work, the effect of H2O2 addition on the flame structure, laminar flame speed and NOx emissions is investigated in the context of 1D laminar premixed H2/air flames at Tu = 300 and 600 K, p = 1 and 30 atm, = 0.5. Mathematical tools from the computational singular perturbation approach are used in order to identify the key chemical and transport mechanisms. The H2O2 addition causes a significant increase to the laminar flame speed (sL), heat release (Q) and NOx emissions. Indicatively, 10% H2O2 addition (per fuel volume) at Tu = 300 K, p = 1 atm results in 72% increase of sL, 100% increase of Q, and 140% increase of the mass fraction of NO. Depending the conditions the flame structure is altered through the chain carrying reaction 10f (H2O2 + H H2O + OH) or the chain branching 9f (H2O2 (+M) 2OH (+M)); the first is favored at low temperatures/pressures while the latter is favored at sufficiently high temperatures/pressures. Both reactions boost the radical pool generation, therefore contributing to the broadening of the reaction zone. The reaction with the largest contribution to Q that is mostly affected (decreased) by the addition of H2O2 is reaction 21 (H + O2 (+M) HO2 (+M)). Moreover, the H2O2 addition enhances the stability of the flame. Finally, the increased production of NO is mainly associated with the increased temperature that is reached with the addition of H2O2.

Journal Article Type Article
Acceptance Date May 15, 2021
Online Publication Date May 29, 2021
Publication Date 2021-10
Deposit Date Jun 3, 2021
Publicly Available Date May 30, 2022
Journal Fuel
Print ISSN 0016-2361
Publisher Elsevier
Peer Reviewed Peer Reviewed
Volume 302
Article Number 121081
DOI https://doi.org/10.1016/j.fuel.2021.121081
Keywords Clean fuel, CSP, Explosive mode, Diesel engines, Hydrogen, NOx
Public URL http://researchrepository.napier.ac.uk/Output/2777635

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Computational analysis of the effect of hydrogen peroxide addition on premixed laminar hydrogen/air flames (accepted version) (790 Kb)
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http://creativecommons.org/licenses/by-nc-nd/4.0/

Copyright Statement
Accepted version licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International (CC BY-NC-ND 4.0) license.






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