Journal of the Korean Society of Combustion (한국연소학회지)

The Korean Society of Combustion (한국연소학회)
권호 표지
DOI QR코드

DOI QR Code

The Pollutant Emission Characteristics of Lean-Rich Combustion System with Exhaust Gas Recirculation

배기가스 재순환을 적용한 희박-과농 연소시스템의 공해물질 배출특성 연구

  • Oh, Wheesung (Department of Mechanical Engineering, Inha University) ;
  • Lee, Chang-Eon (Department of Mechanical Engineering, Inha University) ;
  • Yu, Byeonghun (Department of Mechanical Engineering, Inha University)
  • Received : 2015.03.09
  • Accepted : 2015.06.01
  • Published : 2015.06.30
Download PDF
⟨ Previous Next ⟩

Abstract

In this study, the CH4/air lean-rich combustion system with exhaust gas recirculation (EGR) was investigated to explore the potential for lowering pollutant emissions. To achieve this purpose, experiments of lean-rich combustion system with EGR were conducted to measure the changes in the characteristics of the pollutant emission and flame shape with various equivalence ratios and EGR rates. Here, this study was applied to the fuel distribution ratio of 3:1 for the formation of the lean and rich flames. Additionally, the results were compared with $CH_4$/air lean premixed combustion system. The results show that flame shape of lean-rich combustion system was determined by lean and rich equivalence ratios (${\Phi}_L$ and ${\Phi}_R$) and stratified flame was formed with increasing ${\Phi}_R$. According to the pollutant emission characteristics based on experimental results, the NOx and CO emission index (EINOx and EICO) decreased with increasing EGR rate. Especially, in the range needed to form a stable flame, the reduction rates of EINOx and EICO were approximately 47% and 48% for an EGR rate of 25%, global equivalence ratio of 0.85 and ${\Phi}_L$ of 0.80 compared with lean premixed combustion system (${\Phi}$ = 0.78).

Keywords

References

  1. Aurelien G, Elena RV and Oliver W, Development of European Ecolabel Criteria for Hydronic Heaters, European commission: Institute for Prospective technological studies, 2013.
  2. SCAQMD, Rule 1146.2, Emissions of oxides of nitrogen from large water heaters and small boilers and process heaters.
  3. Korea Environment Corporation, Low NOx burner approval test and performance verification test, available from: http://www.keco.or.kr/en/core/prevention_vapor/contentsid/2020/index.do
  4. B. Yu, S.M. Kim, C.E. Lee and S. Lee, Combustion characteristics and thermal efficiency for premixed porous-media types of burners, Energy, 53 (2013) 343-350. https://doi.org/10.1016/j.energy.2013.02.035
  5. S.A. Leonardi, R. Viskanta and J.P. Groe, Analytical and Experimental Study of Combustion and Heat transfer in Submerged Flame Metal Fiber Burners/Heaters, J. Heat Transfer, 125(1) (2003) 118-125. https://doi.org/10.1115/1.1527910
  6. W. Lee, T. Ahn and Y. Nam, Control the Blow-off Characteristics of Lean Premixed Flames Utilizing a Stratified Flame Concept, J. Korean Soc. Combust., 17(4) (2012) 11-20.
  7. T. Ahn, Y. Nam and W. Lee, Flow Stratification and Flmae Blow-Off Characteristics of Co-Flow Lean Premixed Flames, The 43th KOSCO Symposium, 2011, 347-352.
  8. W. Lee and D. Seo, A Study on the Stability of Rich/Lean Methane Premixed Flame, Trans. KSAE, 13(2) (2005) 170-177.
  9. V.S. Yadav, S.L. Soni and D. Sharma, Performance and emission studies of direct injection C.K. engine in duel fuel mode (hydrogen-diesel) with EGR, Int. J. Hydrog. Energy, 37 (2012) 3807-3817. https://doi.org/10.1016/j.ijhydene.2011.04.163
  10. T. Lakshmanan and G. Nagarajan, Study on using acetylene in dual fuel mode with exhaust gas recirculation, Energy, 36 (2011) 3547-3553. https://doi.org/10.1016/j.energy.2011.03.061
  11. B. Yu, S.M. Kum, C.E. Lee, S. Lee, Study on the combustion characteristics of a premixed combustion system with exhaust gas recirculation, Energy, 61 (2013) 345-353. https://doi.org/10.1016/j.energy.2013.08.057
  12. B. Yu, S.M. Kum, C.E. Lee, S. Lee, Effects of exhaust gas recirculation on the thermal efficiency and combustion characteristics for premixed combustion system, Energy, 49 (2013) 375-383. https://doi.org/10.1016/j.energy.2012.10.057
  13. S.R. Turns, An Introduction to Combustion, Mc-Graw-Hill, Singapore, 2000.
  14. C.L. Cha, H.Y. Lee and S.S. Hwang, Visualization of Oxygen Flameless Combustion, The 49th KOSCO Symposium, 2014, 403-404.
  15. C.H. Hwang, S.W. Baek and H.Y. Kim, Numerical Investigation on the Thermal Characteristics of Mild Combustion According to Co-axial Air, J. Korean Soc. Combust., 15(4) (2010) 1-8.
  16. E.S. Cho and S.H. Chung, Experiment on Low NOx Combustion Characteristics by Flue Gas Dilution in Air and Fuel Sides, Proceeding of the KSME 2004 Spring Annual Meeting, 1499-1504.