The blow-off and transient characteristics of co-firing ammonia/methane fuels in a swirl combustor

By Meng Zhang, Xutao Wei, Jinhua Wang, Zuo-hua Huang, H. Tan. Proceedings of the Combustion Institute, 2020

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Abstract Recent studies have demonstrated that ammonia could be one of the most promising hydrogen carrier candidates which can be used in large-scale power plants. However, it is challenging to burn ammonia in gas turbines due to its narrow flame stabilization limits. This study investigates the blow-off characteristics and flame macrostructure transition behavior of ammonia/air flame (i.e. NH3 flame) and ammonia/methane/air flame (i.e. 50%NH3 flame) in a swirl combustor. Methane/air flame (i.e. CH4 flame) is also demonstrated for comparative purposes. The flow field and instantaneous OH profile are measured with PIV and OH-PLIF technique, respectively. Large eddy simulation (LES) is conducted to extend understandings of the experimental findings. The results show that the NH3 flame possesses a poor lean flame stability limit which can be largely extended by adding CH4 in the fuel. Moreover, changing swirl number (S) shows no apparent effect on the lean blow-off limit (ϕb) for the NH3 flame. On the contrary, a clear extension on ϕb is found for the 50%NH3 flame when increasing S. Four flame macrostructure modes can be identified when decreasing equivalence ratio (ϕ). The transition from flame II to flame III (ϕt describes the transition equivalence ratio) can be considered as the early warning of blow-off for a swirl stabilized flame. It is found that for the NH3 flame, there is no clear flame macrostructure transition at small inlet velocities (U

Subfields: Biomedical Engineering, Computational Mechanics, Fluid Flow and Transfer Processes

View Paper: https://www.semanticscholar.org/paper/7a5c095b46d68c486d4b010aa9ba05640daf4529

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  1. Meng Zhang
  2. Zhenhua An
  3. Liang Wang
  4. Xutao Wei
  5. Jinhua Wang
  6. Zuo-hua Huang
  7. Bieerlan Jianayihan
  8. H. Tan

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