Abstract
The use of simulation tools such as CFD leads to a detailed fundamental understanding of the complex processes during coal combustion. Thus, mathematical modeling provides an important instrument for research and development of the oxy-coal combustion technology which represents one of the promising CO2 capture and storage (CCS) technologies. In this process, coal is burnt in an atmosphere consisting of pure O2 mixed with recycled flue gas leading to an exhaust gas with high CO2 concentration which is ready for storage after further conditioning. However, the specific conditions of the oxy-coal combustion process require several adjustments in the CFD code which was originally been developed for conventional air-firing combustion. Accordingly, advanced sub-models concerning global homogeneous and heterogeneous chemistry as well as gas phase radiation have been developed and implemented in IFK’s CFD code AIOLOS.
The objective of this study was to investigate the accuracy and prediction quality of the enhanced modeling approach. The simulation results focus on temperature profiles and gas species concentrations. For validation purposes extensive tests have been carried out at IFK’s semi-industrial scale furnace (500 kWth) firing dried pulverized lignite. In general, the simulation results show satisfactory agreement to the corresponding measurements indicating that the developed mathematical models are suitable for the application of the AIOLOS code in the field of oxy-coal combustion.
This is a preview of subscription content, log in via an institution to check access.
Access this chapter
Tax calculation will be finalised at checkout
Purchases are for personal use only
Preview
Unable to display preview. Download preview PDF.
Similar content being viewed by others
References
A. Kather, G. Scheffknecht, The oxycoal process with cryogenic oxygen supply, Naturwissenschaften 96 (2009) 993–1010.
D. Singh, E. Croiset, P. L. Douglas, M. A. Douglas, Techno-economic study of CO2 capture from an existing coal-fired power plant: MEA scrubbing vs. O2/CO2 recycle combustion, Energy Conversion and Management 44 (19) (2003) 3073–3091.
T. F. Wall, Combustion processes for carbon capture, Proceedings of the Combustion Institute 31 (2007) 31–47.
B. J. P. Buhre, L. K. Elliott, C. D. Sheng, R. P. Gupta, T. F. Wall, Oxy-fuel combustion technology for coal-fired power generation, Progress in Energy and Combustion Science 31 (2005) 283–307.
S. P. Khare, T. F. Wall, A. Z. Farida, Y. Liu, B. Moghtaderi, R. P. Gupta, Factors influencing the ignition of flames from air-fired swirl pf burners retrofitted to oxy-fuel, Fuel (87) (2008) 1042–1049.
B. E. Launder, D. B. Spalding, The numerical computation of turbulent flows, Computer Methods in Applied Mechanics and Engineering 3 (2) (1974) 269–289.
A. W. Date, Complete pressure correction algorithm for the solution of compressible Navier-Stokes equations on a nonstaggered grid, Numerical Heat Transfer, Part B: Fundamentals 29 (4) (1996) 441–458.
U. Schnell, Numerical modelling of solid fuel combustion processes using advanced CFD-based simulation tools, Progress in Computational Fluid Dynamics 1 (4) (2001) 208–218.
D. Förtsch, A Kinetic Model of Pulverised Coal Combustion for Computational Fluid Dynamics, Ph.D. thesis, Universität Stuttgart, Stuttgart (2003).
J. Ströhle, Spectral Modelling of Radiative Heat Transfer in Industrial Furnaces, Shaker Verlag, Aachen, 2003.
L. Al-Makhadmeh, Coal Pyrolysis and Char Combustion Under Oxy-Fuel Conditions, Shaker Verlag, Aachen, 2009.
P. Glarborg, L. L. B. Bentzen, Chemical effects of a high CO concentration in oxy-fuel combustion of methane, Energy & Fuels 22 (1) (2008) 291–296.
S. Leiser, Numerical Simulation of Oxy-Fuel Combustion, Shaker Verlag, Aachen, 2010.
E. W. Lemmon, M. O. McLinden, D. G. Friend, NIST Chemistry WebBook (2009).
I. R. Gran, B. F. Magnussen, A numerical study of a bluff-body stabilized diffusion flame. Part 2. Influence of combustion modeling and finite-rate chemistry, Combustion Science and Technology 119 (1) (1996) 191–217.
J. R. Arthur, Reactions between carbon and oxygen, Transactions of the Faraday Society 47 (1951) 164–178.
D. G. Roberts, D. J. Harris, Char gasification in mixtures of CO2 and H2O: Competition and inhibition, Fuel 86 (2007) 2672–2678.
T. Wall, Y. Liu, C. Spero, L. Elliott, S. Khare, R. Rathnam, F. Zeenathal, B. Moghtaderi, B. Buhre, C. Sheng, R. Gupta, T. Yamada, K. Makino, J. Yu, An overview on oxyfuel coal combustion – State of the art research and technology development, Chemical Engineering Research and Design 87 (2009) 1003–1016.
H. C. Hottel, A. F. Sarofim, Radiative Heat Transfer, McGraw-Hill, New York, 1967.
R. Johansson, K. Andersson, B. Leckner, H. Thunman, Models for gaseous radiative heat transfer applied to oxy-fuel conditions in boilers, Journal of Heat and Mass Transfer 53 (2010) 220–230.
R. Johansson, B. Leckner, K. Andersson, F. Johnsson, Account for variations in the H2O to CO2 molar ratio when modelling gaseous radiative heat transfer with the weighted-sum-of-grey-gases model, Combustion and Flame 158 (2011) 893–901.
B. Leckner, Spectral and total emissivity of water vapor and carbon dioxide, Combustion and Flame 19 (1) (1972) 33–48.
N. Lallement, A. Sayre, R. Weber, Evaluation of emissivity correlations for H2O-CO2-N2/air mixtures and coupling with solution methods of the radiative transfer equation, Progress in Energy and Combustion Science 22 (6) (1996) 543–574.
J. H. Joseph, W. J. Wiscombe, The delta-Eddington approximation for radiative flux transfer, Journal of the Atmospheric Sciences 33 (12) (1976) 2452–2459.
S. Grathwohl, O. Lemp, U. Schnell, J. Maier, G. Scheffknecht, F. Kluger, B. Krohmer, P. Mönckert, G. N. Stamatelopoulos, Highly Flexible Burner Concept for Oxyfuel Combustion, in: 1st Oxyfuel Combustion Conference, Cottbus, Germany, 2009.
Author information
Authors and Affiliations
Corresponding author
Editor information
Editors and Affiliations
Rights and permissions
Copyright information
© 2012 Springer-Verlag Berlin Heidelberg
About this paper
Cite this paper
Müller, M., Schnell, U., Scheffknecht, G. (2012). Oxy-coal Combustion Modeling at Semi-industrial Scale. In: Nagel, W., Kröner, D., Resch, M. (eds) High Performance Computing in Science and Engineering '11. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-23869-7_19
Download citation
DOI: https://doi.org/10.1007/978-3-642-23869-7_19
Publisher Name: Springer, Berlin, Heidelberg
Print ISBN: 978-3-642-23868-0
Online ISBN: 978-3-642-23869-7
eBook Packages: Mathematics and StatisticsMathematics and Statistics (R0)