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One axial fuel injected vortex-tube combustor with high capacity of combustion stabilization for NOx reduction

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Listed:
  • Ren, Shoujun
  • Yang, Haolin
  • Jiang, Liqiao
  • Zhao, Daiqing
  • Wang, Xiaohan

Abstract

A novel vortex-tube combustor with axial fuel injection for NOx reduction was proposed to overcome the instability of ultra-lean combustion. The stability limit, flame configuration, NOx and CO emissions, and flame structure were investigated experimentally under various global equivalence ratios and fuel flow rates. The mechanisms of NOx emission reduction were analyzed by numerical simulation. Results show that the limit of global equivalence ratio can be as low as 0.01 and the amplitude of pressure fluctuation is always less than 1300 Pa, indicating fairly good performance in combustion stabilization of the combustor. In the operation range, there is a trade-off region with low NOx and CO simultaneously. The diffusion-like flame structure in this combustor can enhance the local equivalence ratio, whilst the flow field structure can also promote the transport of chemical enthalpy to the flame front, thus facilitating the stabilization. The enhanced stabilization enables the ultra-lean combustion and the ensued small area of the high-temperature zone to conduct, as well as the low NOx formation through reducing thermal NO. The local fuel-rich region and the flow field structure can promote the NOx to be reduced further via the Fenimore mechanism.

Suggested Citation

  • Ren, Shoujun & Yang, Haolin & Jiang, Liqiao & Zhao, Daiqing & Wang, Xiaohan, 2020. "One axial fuel injected vortex-tube combustor with high capacity of combustion stabilization for NOx reduction," Energy, Elsevier, vol. 211(C).
    • Handle: RePEc:eee:energy:v:211:y:2020:i:c:s0360544220317679
    DOI: 10.1016/j.energy.2020.118659
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    References listed on IDEAS

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    1. Ren, Shoujun & Yang, Haolin & Jiang, Liqiao & Zhao, Daiqing & Wang, Xiaohan, 2020. "Stabilization characteristics and mechanisms in a novel tubular flame burner with localized stratified property," Energy, Elsevier, vol. 197(C).
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