Revealing the NO Formation Kinetics for NH 3 /CH 4 Blends Under Dual-Flame and Premixed Swirl Flame Configurations

Siqi Wang, Cheng Tung Chong (), Soroush Sheykhbaglou, Jo-Han Ng, Bo Tian and Agustin Valera-Medina
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Siqi Wang: China-UK Low Carbon College, Shanghai Jiao Tong University, Lingang, Shanghai 201306, China
Cheng Tung Chong: China-UK Low Carbon College, Shanghai Jiao Tong University, Lingang, Shanghai 201306, China
Soroush Sheykhbaglou: China-UK Low Carbon College, Shanghai Jiao Tong University, Lingang, Shanghai 201306, China
Jo-Han Ng: Carbon Neutrality Research Group, University of Southampton Malaysia, 79100 Iskandar Puteri, Johor, Malaysia
Bo Tian: School of Engineering, University of Leicester, Leicester LE1 7RH, UK
Agustin Valera-Medina: College of Physical Sciences and Engineering, Cardiff University, Cardiff CF24 3AA, UK

Energies, 2024, vol. 17, issue 23, 1-25

Abstract: Ammonia stands out as a promising zero-carbon fuel and an efficient hydrogen carrier, offering great promise for industrial applications in gas turbines and boilers. However, different combustion modes significantly influence the flame structure and combustion characteristics of ammonia. In this study, two distinct fuel injection strategies were employed in a model combustor: ammonia and methane, under fully premixed and dual-flame combustion modes. Numerical simulations were performed to analyze the flame structure, velocity fields, and temperature distribution, complemented by planar flow field, flame OH* chemiluminescence, and NO emission measurements. Findings reveal that with an increasing NH 3 ratio, the flame front becomes more elongated with more pronounced temperature fluctuations at the swirler exit. Particularly, at 50% NH 3 , a significant reduction in flame temperature is observed, notably at a height of 30 mm from the burner. For dual flames, the reaction NH 2 + O ↔ HNO + H was less significant compared to its effect in premixed flames, whereas the H + O 2 ↔ O + OH reaction demonstrated the highest sensitivity coefficient. An increase in the NH 3 ratio correspondingly led to a reduction in NO consumption reaction rates, heightening the sensitivity coefficient for NO inhibition, and providing critical insights into ammonia combustion optimization.

Keywords: ammonia; swirl flame; PIV; dual flame; FGM model; NO x emissions (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2024
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