Analysis of impact factors for exhaust tube vortex flame generation in methane-assisted pulverized coal swirling flames

Choi, Muhan; Li, Xinzhuo; Kim, Kibeom; Park, Yeseul; Sung, Youl-Moon; Choi, Gyung‐Min

doi:10.1016/j.applthermaleng.2019.03.121

Cited by 12 publications

(1 citation statement)

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“…From the literature it has been observed that around 30%-40% of NO can be reduced by using reburn fuel at flame downstream. Some of the authors worked on co-flow methane injection in pulverized coal combustion systems experimentally [18] and computationally [19,20]. But no one investigated the effect of methane on NO reduction rather they used methane as a secondary fuel only.…”

Section: Introductionmentioning

confidence: 99%

No formation and its reduction through co-flow methane reburn in a pulverised coal combustion process under various overall equivalence ratio

Sahu

Ghose

2021

Journal of Thermal Engineering

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Computational simulation has been carried out to investigate the NO formation/depletion in pulverized coal combustion process. Newlands Bituminous coal is injected along with career air through a central hole of an axi-symmetric burner. A certain amount of co-flow methane is injected coaxially as reburn fuel. The effect of overall equivalence ratio on NO formation and NO reburn are mainly focused in this study. Species concentration for various species are also investigated, because both NO formation and depletion are related closely to various species concentration. From the study it is observed that, at overall equivalence ratio φ = 0.8 and 1.0, although the rate of Thermal-NO, Prompt-NO and Fuel-NO formation is high but due to narrow reaction zone and higher air velocity, a weak NO concentration field is observed. On the other hand, a higher NO concentration has been observed with higher equivalence ratio (ratio φ = 3.0, 6.0 and 9.0). It also has been observed, the maximum NO reduction efficiency at φ = 0.8, 1.0 and 3.0 is in between 1% to 7%, whereas for φ = 6.0 and 9.0, the maximum NO reduction efficiency is 27% and 34% respectively. Therefore, co-flow methane injection NO reduction method is more suitable for highly rich mixture conditions. Moreover, the percentage of coal burnout is also relatively higher for higher equivalence ratio condition.Cite this article as: Ajay K S, Prakash G. No formation and its reduction through co-flow methane reburn in a pulverised coal combustion process under various overall equivalence ratio.

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Section: Introductionmentioning

confidence: 99%