Abstract
The viscosity-temperature relation of slag determines its behavior inside an entrained flow coal gasifier. However, existing prediction models give results with large variations among them. We investigated the influence of different viscosity models in the prediction of the steady and transient behaviors of slag flow on the wall of a gasifier undergoing gas temperature changes. Five viscosity models adopted showed differences in the temperature (T250) at 25 Pa∙s as large as 97 K for the selected slag composition, which was used as the interface temperature between the solid and liquid slag. When the predicted viscosity and corresponding T250 increased, the solid slag became thicker and the dynamic response of the slag became slower. In contrast, the differences in the liquid slag thickness were small. The influence of T250 predicted was dominant, compared to that of different viscosity curves of the liquid slag.
Article PDF
Similar content being viewed by others
Avoid common mistakes on your manuscript.
References
L.D. Smoot and P. J. Smith, Coal combustion and gasification, Springer Science & Business Media (2013).
T. K. Kaneko, J. P. Bennett and S. Sridhar, J. Am. Ceram. Soc., 94, 4507 (2011).
G. N. Shannon, P. L. Rozelle, S.V. Pisupati and S. Sridhar, Fuel Process. Technol., 89, 1379 (2008).
W. Song, Y. Sun, Y. Wu, Z. Zhu and S. Koyama, AIChE J., 57, 801 (2011).
C. Higman and S. Tam, Chemical Reviews, 114, 1673 (2013).
M. A. Duchesne, A. Macchi, D.Y. Lu, R.W. Hughes, D. McCalden and E. J. Anthony, Fuel Process. Technol., 91, 831 (2010).
M. Oh, D. Brooker, E. De Paz, J. Brady and T. Decker, Fuel Process. Technol., 44, 191 (1995).
S. Vargas, Straw and coal ash rheology, Department of Chemical Engineering, Technical University of Denmark (2001).
J. Wang, H. Liu, Q. Liang and J. Xu, Fuel Process. Technol., 106, 704 (2013).
K.C. Mills, L. Yuan and R.T. Jones, J. South. Afr. Inst. Min. Metall., 111, 649 (2011).
M. Seggiani, Fuel, 77, 1611 (1998).
S.Z. Yong and A. Ghoniem, Fuel, 97, 457 (2012).
D. Bi, Q. Guan, W. Xuan and J. Zhang, Fuel, 150, 565 (2015).
R. F. Monaghan and A. F. Ghoniem, Fuel, 91, 61 (2012).
G. Urbain, Trans. J. Br. Ceram. Soc., 80, 139 (1981).
W.T. Reid, External corrosion and deposits: Boilers and gas turbines, Fuel and Energy Science Series; American Elsevier Publishing Co., New York (1971).
J. Watt and F. Fereday, J. Inst. Fuel, 42, 99 (1969).
G. Browning, G. Bryant, H. Hurst, J. Lucas and T. Wall, Energy Fuel, 17, 731 (2003).
D. P. Kalmanovitch and M. Frank, An effective model of viscosity for ash deposition phenomena, Proceedings of mineral matter and ash deposition from coal, 22 (1988).
K. Mills, Estimation of physicochemical properties of coal slags and ashes, ACS Publications (1986).
S. Vargas, F. Frandsen and K. Dam-Johansen, Elsam-idemitsu kosan cooperative research project: Performance of viscosity models for hightemperature coal ashes, Department of Chemical Engineer-ing, Technical University of Denmark, CHEC Report (1997).
A. Kondratiev and E. Jak, Fuel, 80, 1989 (2001).
H. Saxén and X. Zhang, Neural-network based model of blast furnace slag viscosity, Proceedings of the International Conference on Engineering Application of Neural Networks, 167 (1997).
M.A. Duchesne, A. M. Bronsch, R.W. Hughes and P. J. Masset, Fuel, 114, 38 (2013).
M. Seggiani, Fuel, 78, 1121 (1999).
S.Z. Yong, M. Gazzino and A. Ghoniem, Fuel, 92, 162 (2012).
I. Ye and C. Ryu, Fuel, 150, 64 (2015).
M. Kim, I. Ye and C. Ryu, Fuel, 196, 532 (2017).
C. Kim, R. Kim, Z. Wu and C. Jeon, Korean J. Chem. Eng., 33, 1767 (2016).
H. Lee, J. Lee, Y. Joo, M. Oh and C. Lee, Appl. Energy, 131, 425 (2014).
Z. Yang, Y. Xue, Y. Wu, Z. Wang, Z. Li and W. Ni, Chem. Eng. Process. Process Intensif., 74, 131 (2013).
K.C. Mills and J.M. Rhine, Fuel, 68, 193 (1989).
K.C. Mills and J.M. Rhine, Fuel, 68, 904 (1989).
B. Zhang, Z. Shen, D. Han, Q. Liang, J. Xu and H. Liu, Appl. Therm. Eng., 112, 1178 (2017).
I. Ye, J. Oh and C. Ryu, Energies, 8, 3370 (2015).
Author information
Authors and Affiliations
Corresponding author
Additional information
To whom correspondence should be addressed.
Rights and permissions
About this article
Cite this article
Kim, M., Ye, I. & Ryu, C. Effect of slag viscosity model on transient simulations of wall slag flow in an entrained coal gasifier. Korean J. Chem. Eng. 35, 1065–1072 (2018). https://doi.org/10.1007/s11814-018-0008-x
Received:
Accepted:
Published:
Issue Date:
DOI: https://doi.org/10.1007/s11814-018-0008-x