대한기계학회논문집B (Transactions of the Korean Society of Mechanical Engineers B)

  • 제27권2호
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  • Pages.215-226
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  • 2003
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  • 1226-4881(pISSN)
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  • 2288-5324(eISSN)
대한기계학회 (The Korean Society of Mechanical Engineers)
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동축 공기다단 LPG화염의 NOx 생성특성에 관한 연구

Characteristics of NOB Formation in a Coaxial Multi-Air Staged LPG Flame

  • 발행 : 2003.02.01
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초록

Experimental and numerical studies have been done to examine the effects of excess air ratio and tertiary air swirl number on the formation characteristics of NOx in a pilot scale combustor adopting a multi-air staged burner. In numerical calculation the mathematical models for turbulence, radiation and nitric oxide chemistry were taken into account. The radiative transfer equation was solved using the discrete ordinates method with the weighted sum of gray gases model. In the NOx chemistry model, the chemical reaction rates for thermal and prompt NOx were statistically averaged using a probability density function. The results were validated by comparison with measurements. For the experiment, a 0.2 MW pilot multi-staged air burner has been designed and fabricated. Using the numerical simulation developed here, a variation of thermal and prompt NOx formation was predicted by changing the excess air ratio and tertiary air swirl number. As the excess air ratio increased up to 1.9, the formation of the total as well as thermal NOx at exit increased while the prompt NOx decreased. The formation of thermal NOx was more affected by concentration of $O_2$ and $N_2$ than gas temperature. When the tertiary air swirl number increased, the formation of the total as well as the prompt NOx slightly decreased.

키워드

참고문헌

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피인용 문헌

  1. Effect of Pressure and Stoichiometric Air Ratio on NOx Emissions in Gas-Turbine Dump Combustor with Double Cone Burner vol.36, pp.3, 2012, https://doi.org/10.3795/KSME-B.2012.36.3.251