Journal of the Korean Society for Aeronautical & Space Sciences (한국항공우주학회지)

The Korean Society for Aeronautical and Space Sciences (한국항공우주학회)
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Experimental Study on Dilution Effect of Exhaust Gas in SNG Combustion on a Model Gas Turbine

가스터빈에서 SNG 연료 조성에 대한 희석제의 배기배출물 저감효과에 대한 실험적 연구

  • Joo, Seongpil (Seoul National University, Department of Mechanical and Aerospace Engineering) ;
  • Yoon, Jisu (Seoul National University, Department of Mechanical and Aerospace Engineering) ;
  • Kim, Jeongjin (Seoul National University, Department of Mechanical and Aerospace Engineering) ;
  • Kim, Seongheon (Seoul National University, Department of Mechanical and Aerospace Engineering) ;
  • Yoon, Youngbin (Seoul National University, Department of Mechanical and Aerospace Engineering)
  • Received : 2016.03.10
  • Accepted : 2016.06.15
  • Published : 2016.07.01
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Abstract

This paper describes experimental results about emission and NOx reduction of dilution effect (Nitrogen and carbon dioxide) about various fuel compositions of synthetic natural gas (SNG). Combustion experiment was performed to investigate the combustion characteristics for SNG with various hydrogen ratio in SNG, heat input and equivalence ratio in a partially premixed model gas turbine combustor. NOx emission was similar to each hydrogen ratio and flame characteristics was investigated from OH chemiluminescence images. There was a singularity of CO emission in stoichiometric condition and it can be identified using OH chemiluminescence intensity. In addition, dilution effect was studied in using nitrogen and carbon dioxide as diluent to reduce the NOx emission. Carbon dioxide diluent was more effective to NOx reduction than nitrogen diluent because of its high diluent specific heat and its heat capacity.

본 논문에서는 석탄으로부터 생성된 합성천연가스(SNG)의 다양한 연료 조성에 대한 배기가스 배출 특성 및 희석제에 대한 NOx배출 저감에 대해 기술하였다. 예혼합거리가 짧은 부분 예혼합 가스터빈 연소기에서 SNG 연료조성에서의 수소 비율과 입열량, 당량비를 조절해 가며 연소특성을 관찰하였다. 수소 비율에 따른 NOx 배출지수는 유사하게 나타났고, 화염가시화를 통해 화염의 특성을 파악할 수 있었다. CO 배출의 경우 당량비 1 구간에서 특이점이 나타났으며, 이를 화염의 자발광 이미지와 자발광 강도를 통하여 원인을 파악할 수 있었다. 또한 높은 NOx 배출을 저감하기 위하여 질소($N_2$)와 이산화탄소($CO_2$) 희석제를 사용하여 희석제 공급량에 대한 저감 효과를 파악하였다. 이로부터 희석제의 비열과 열용량이 연소로부터 발생한 연소열을 흡수하여 열화에 의한 NOx 배출을 저감하는 효과를 확인하였다.

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References

  1. Mangena, S. J., Bunt, J. R., and Waanders, F. B., "Mineralogical behaviour of North Dakota lignite in an oxygen/steam blown moving bed reactor", Fuel Processing Technology, Vol. 106, 2013, pp.474-482. https://doi.org/10.1016/j.fuproc.2012.09.015
  2. Duret, A., Friedli, C., and Marechal, F., "Process design of Synthetic Natural Gas (SNG) production using wood gasification", Journal of Cleaner Production, Vol. 13, 2005, pp.1434-1446. https://doi.org/10.1016/j.jclepro.2005.04.009
  3. Joo, S. P., Yoon J. S., Kim, J. J., Lee M. C., and Yoon, Y. B., "NOx emissions characteristics of the partially premixed combustion of $H_2/CO/CH_4$ syngas using artificial neural networks", Applied Thermal Engineering, Vol. 80, 2015, pp.436-444. https://doi.org/10.1016/j.applthermaleng.2015.01.057
  4. Cliff, K. and Tom, L., "POSCO Gwangyang project for substitute natural gas (SNG)", Gasification Technologies Conference, 2010.
  5. Kim, K. T., Lee, J. G., Lee, H. J., Quay, B. D., and Santavicca, D. A., "Characterization of Forced Flame Response of Swirl-Stabilized Turbulent Lean-Premixed Flames in a Gas Turbine Combustor", Journal of Engineering for Gas Turbines and Power, Vol. 132, pp. 041502-1-8.
  6. Park, S. I., Kim, U. S., Lee, M. C., Kim S. C., and Cha, D. J., "The effects and characteristics of hydrogen in SNG on gas turbine combustion using a diffusion type combustor", International journal of hydrogen energy, Vol. 38, 2013, pp. 12847-12855. https://doi.org/10.1016/j.ijhydene.2013.07.063
  7. Jeong, C. Y., Shin, J. I., Hwang, J. J., Yoon, J. S., and Yoon Y. B., "Effect of Acoustic Excitation on Lean Blowoff in Turbulent Premixed Bluff Body Flames", Combustion Science and Technology, Vol. 188, 2016, pp. 55-76. https://doi.org/10.1080/00102202.2015.1079524
  8. Yoon, J. S., Lee, M. C., Joo, S. P., Kim, J. J., and Yoon Y. B., "Instability mode and flame structure analysis of various fuel compositions in a model gas turbine combustor", Journal of Mechanical Science and Technology, Vol. 29, 2015, pp. 899-907. https://doi.org/10.1007/s12206-015-0203-1
  9. Snyder, T. S., Rosfjord, T. J., McVey, J. B., and Chiappetta, L. M., "Comparison of Liquid Fuel/Air Mixing and NOx Emissions for a Tangential Entry Nozzle", ASME Paper 94-GT-283, 1994.
  10. Lin, J., Qiao, B., Li, L., Guan, H., Ruan, D., Wang, A., Zhang, W., Wanga, X., Zhang, T., "Remarkable effects of hydroxyl species on low-temperature CO (preferential) oxidation over Ir/Fe(OH)x catalyst", Journal of Catalysis, Vol. 319 2014, pp. 142-149. https://doi.org/10.1016/j.jcat.2014.08.011
  11. Rink, K. K., and Lefebvre, A. H., "Influence of Fuel Drop Size and Combustor Operating Conditions on Pollutant Emissions", International Journal of Turbo and Jet Engines, Vol. 6, 1989, pp. 113-122.