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J Korean Soc Environ Eng > Volume 36(12); 2014 > Article
J Korean Soc Environ Eng 2014;36(12): 837-842. doi: https://doi.org/10.4491/KSEE.2014.36.12.837
가습 공기의 LNG 화염 Thermal NOx 저감의 수치 해석적 연구
신미수1, 박미선2, 장동순1
1충남대학교 환경공학과
2한국원자력연구원 원자력환경안전부
Numerical Study on the Thermal NOx Reduction by Addition of Moisture in LNG Flame
Mi-Soo Shin1, Mi-sun Park2, Dong-soon Jang1
1Department of Environmental Engineering, Chungnam National University
2Korea Atomic Energy Research Institute
Corresponding author  Dong-soon Jang ,Tel: 042-821-6677, Fax: 042-823-8362, Email: p_dsjang@cnu.ac.kr
Received: September 3, 2014;  Revised: December 8, 2014;  Accepted: December 26, 2014.  Published online: December 31, 2014.
ABSTRACT
A computer program is developed for the prediction of NO generation by the addition of water moisture and water electrolysis gas in LNG-fired turbulent reacting flow. This study is the first part to deal with the moisture effect on NO generation. In this study, parametric investigation has been made in order to see the reduction of thermal NO as a function of amount of moisture content in a LNG-fired flame together with the swirl and radiation effect. First of all, calculation results show that the flame separation together with the NO concentration separation are observed by the typical flow separation due to strong swirl flow. With a fixed amount of air, the increased amount of water moisture from 0 to 10% by 2% interval shows the decrease of NO concentration and flame temperature at exit are from 973℃ and 139 ppm to 852℃ and 71 ppm. The radiation effects on the generation on NO appears more dominant than swirl strength over the range employed in this study. However, for the strong swirl flow employed in this study, the flow separation cause the relatively high NO concentration observed near exit after peak concentration in the front side of the combustor.
Key Words: NO Reduction, Moist Air, LNG Flame, Numerical Study, Swirl Strength
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