Transactions of the Korean hydrogen and new energy society (한국수소및신에너지학회논문집)

The Korean Hydrogen and New Energy Society (한국수소및신에너지학회)
권호 표지
DOI QR코드

DOI QR Code

Analysis of Slag Behavior near the Slag Tap in an Entrained Flow Coal Gasifier

분류층 석탄가스화기 하부 슬래그 탭 부근의 슬래그 거동 해석

  • 정재화 (한국전력공사 전력연구원 수화력발전연구소) ;
  • 지준화 (한국전력공사 전력연구원 수화력발전연구소) ;
  • 이중원 (한국전력공사 전력연구원 수화력발전연구소) ;
  • 서석빈 (한국전력공사 전력연구원 수화력발전연구소) ;
  • 김기태 (한국전력공사 전력연구원 수화력발전연구소) ;
  • 박호영 (한국전력공사 전력연구원 수화력발전연구소)
  • Received : 2011.10.07
  • Accepted : 2011.12.27
  • Published : 2011.12.31
Download PDF
⟨ Previous Next ⟩

Abstract

A steady-state analysis has been conducted to predict the behavior of the slag layer in the entrained-flow slagging coal gasifier. The analysis takes into consideration the composition dependent slag properties such as density, viscosity, heat capacity, thermal conductivity, and temperature of critical viscosity. The amount of added flux to the design coal and the variation of syngas temperature inside the gasifier have been adopted as calculation parameters. The predicted results are the local thickness of the molten and the solid slag layers, and the slag viscosity and the velocity distribution across the molten slag layer along the gasifier wall near the slag tap.

Keywords

References

  1. M. Seggiani, "Modelling and Simulation of Time Varying Slag Flow in a Prenflo Entrainedflow Gasifier", Fuel, Vol. 77, No. 14, 1998, pp. 1611-1621. https://doi.org/10.1016/S0016-2361(98)00075-1
  2. P. J. Benyon, "Computational modeling of entrained flow slagging gasifiers", University of Sydney, 2002.
  3. M. J. Bockelie, M. K. Denison, Z. Chen, T. L. Linjewile, C. L. Senior, and A. F. Sarofim, "CFD modeling for entrained flow gasifiers in vision 21 systems", Proceedings of the 19th annual international Pittsburgh coal conference, 2002.
  4. S. Z. Yong, M. Gazzino, and A. Ghoniem, "Modeling the slag layer in solid fuel gasification and combustion - Formulation and sensitivity analysis", Fuel, 2011, available on-line.
  5. S. Liu and Y. Hao, "Numerical study on slag flow in an entrained-flow gasifier", Proceedings of International Mechanical Engineering Congress and Exposition, Seattle, 2007.
  6. J. Ni, Z. Zhou, G. Yu, Q. Liang, and F. Wang, "Molten slag flow and phase transformation behaviors in a slagging entrained-flow coal gasifier", Ind. Eng. Chem. Res., Vol. 49, No. 23, 2010, pp. 12302-12310. https://doi.org/10.1021/ie1013844
  7. 이중원, 김미영, 지준화, 김시문, 박세익, "석탄 가스화 공정 모델링에 관한 연구", 한국수소 및 신에너지학회 논문집, Vol. 21, No. 5, 2010, pp. 425-434.
  8. 송지훈, 강민웅, 서동균, 임성진, 백민수, 황정호, "300MW급 Shell형 1단 분류층 석탄 가스화기의 전산수치해석: 산소/스팀/석탄 주입비, 석탄입자 크기, 주입 노즐 각도가 가스화기 성능에 미치는 영향", 한국수소 및 신에너지학회논문집, Vol. 21, No. 3, 2010, pp. 227-240.
  9. 지준화, 오민, 김시문, 김미영, 이중원, 김의식, "석탄 가스화 반응의 동적 거동 전산모사", 한국수소 및 신에너지학회 논문집, Vol. 22, No.3, 2011, pp. 623-630.
  10. 박윤경, 오명숙, "환원 조건에서 석탄 슬래그의 Tcv 예측", 화학공학, Vol. 44, No. 6, 2006, pp. 623-630.
  11. 구자형, 백민수, 유정석, 김봉근, 김유석, 이황직, "300MW IGCC 가스화플랜트의 가스화성능 및 Slag System 용량 예측", 한국신재생에너지학회 2008년도 추계학슬대회논문집, 2008, pp. 234-237.
  12. M. E. Rodgers, "Slag layers in coal-fired MHD generators", Ph.D Thesis, Stanford University, 1978.
  13. K. C. Mills and J. M. Rhine, "The measurements and estimation of the physical properties of slags formed during coal gasification: 1. Properties relevant to fluid flow", Fuel, Vol. 68, 1989, pp. 193-200. https://doi.org/10.1016/0016-2361(89)90322-0
  14. K. C. Mills and J. M. Rhine, "The measurements and estimation of the physical properties of slags formed during coal gasification: 2. Properties relevant to heat transfer", Fuel, Vol. 68, 1989, pp. 904-910. https://doi.org/10.1016/0016-2361(89)90128-2
  15. S. Vargas, F. J. Frandsen, and K. Dam- Johansen, "Rheological properties of hightemperature melts of coal ashes and other silicates", Progress in Energy and Combustion Science, 27, 2001, pp. 273-429.
  16. W. T. Reid and P. Cohen, "The flow characteristics of coal-ash slags in the solidification range", Trans. ASME, Vol. 66, 1944, pp. 83-97.
  17. R. B. Bird, W. E. Stewart, and E. N. Lightfoot, "Transport Phenomena", John Wiley, 1960.
  18. B. Li, A. Brink, and M. Hupa, "Simplified model for determining local heat flux boundary conditions for slagging wall", Energy & Fuels, Vol. 23, 2009, pp. 3418-3422. https://doi.org/10.1021/ef800957k