In coal combustion processes, a large amount of nonvolatile material is emitted as particular matter carried by the gas stream. Moreover, some condensable vapors (usually sulfates and nitrates) are formed by reaction in the flue gases. The control of these particles and vapors is a key factor in clean coal conversion technologies. Thus, the formation of soot and fly ash deposits and the condensation of vapors over heat exchanger tubes and exhaust lines reduce the heat transfer efficiency and promote corrosion problems, leading to shorter lifetimes of the equipment and increasing the production and maintenance costs. Also, the emission of submicron particles to the ambient air is an environmental issue of capital importance. Moreover, the bulk (porosity, hardness) and surface (roughness) properties of the formed deposit depend on the particle arrival dynamics. Therefore, the analysis of particle and vapor transport under controlled conditions and the study of deposit formation from particle laden gases are problems of wide practical implications in coal combustion. In particular, there is a need of theoretical analysis on the dynamics of particles in gases under strong temperature differences and intense radiative fluxes, as well as on the behavior of particles near obstacles to evaluate the deposition rates. Some model problems linked to the behavior of particles and vapors in gases and deposit formation will be discussed here.
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.
References
Castillo, J.L., Garcia-Ybarra, P.L.: Diffusive leakage of small particles towards blowing surfaces. J. Aerosol Sci., 29, S1107 (1998)
Castillo, J.L., Mackowski, D., Rosner, D.E.: Photophoretic modification of the transport of absorbing particles across combustion gas boundary layers. Prog. Energy and Comb. Sci., 16, 253-260 (1990)
Castillo, J.L., Rosner, D.E.: A nonequilibrium theory of surface deposition from particle-laden, dilute condensible vapor-containing laminar boundary layers. Int. J. Multiphase Flow, 14, 99-120 (1988)
Castillo, J.L., Rosner, D.E.: Theory of surface deposition from a unary dilute vapor-containing stream, allowing for condensation within the laminar boundary layer. Chem. Engng. Sci., 44, 925-937 (1989)
Castillo, J.L., Rosner, D.E.: Equilibrium theory of surface deposition from particle-laden dilute, saturated vapor containing laminar boundary layers. Chem. Engng. Sci., 44, 939-956 (1989)
Castillo, J.L., Rosner, D.E.: Theory of turface deposition from a binary dilute vapor-containing stream, allowing for equilibrium condensation within the lam- inar boundary layer. Int. J. Multiphase Flow, 15, 97-118 (1989)
Friedlander, S.K., Fernandez de la Mora, J., Gokoglu, S.A.: Diffusive leakage of small particles across the dust-free layer near a hot wall. J. Colloid Interface Sci., 125, 351-355 (1988)
Garcia-Ybarra, P.L., Castillo, J.L.: Mass transfer dominated by thermal diffu- sion in laminar boundary layers. J. Fluid Mech., 336, 379-409 (1997)
Garcia-Ybarra, P.L., Castillo, J.L., Rosner, D.E.: Drag on a large spherical ag- gregate with self-similar structure: an asymptotic analysis. J. Aerosol Sci., 37, 413-428 (2006)
Goren, S.L.: Thermophoresis of aerosol particles in the laminar boundary layer on a flat plate, J. Colloid Interface Sci., 61, 77-85 (1977)
Konstandopoulos, A.G., Rosner, D.E.: Inertial effects on thermophoretic trans- port of small particles to walls with streamwise curvature-I: Theory. Intl J. Heat Mass Transfer, 38, 2305-2315 (1995), -II: Experiment. Intl J. Heat Mass Transfer, 38, 2317-2327 (1995)
Liang, B., Gomez, A., Castillo, J.L., Rosner, D.E.: Experimental studies of nu- cleation phenomena within thermal boundary layers - influence on chemical vapor deposition rate processes. Chem. Engng. Comm., 85, 113-133 (1989)
Perea, A., Castillo, J.L., Garcia-Ybarra, P.L.: Fickian leakage on boundary lay- ers with blowing. J. Aerosol Sci., 34, S117-118 (2003)
Rodriguez-Perez, D., Castillo, J.L., Antoranz, J.C.: Relationship between particle deposit characteristics and the mechanism of particle arrival. Phys. Rev. E, 72,021403 (2005)
Rosner, D.E., Mackowski, D.W., Garcia-Ybarra, P.L.: Size- and structure- insensitivity of the thermophoretic transport of aggregated soot particles in gases. Comb. Sci. Tech., 80, 87-101 (1991)
Rosner, D.E., Mackowski, D.W., Tassopoulos, M., Castillo, J.L., Garcia-Ybarra, P.L.: Effects of heat transfer on the dynamics and transport of small particles suspended in gases. I&EC Res., 31, 760-769 (1992)
Stratmann, F., Fissan, H., Papperger, A., Friedlander, S.: Suppression of particle deposition to surfaces by the thermophoretic force, Aerosol Sci. Tech., 9, 115-121 (1988)
Talbot, L., Cheng, R.K., Schefer, R.W., Willis, D.R.: Thermophoresis of parti- cles in a heated boundary layer. J. Fluid Mech., 101, 737-758 (1980)
Author information
Authors and Affiliations
Editor information
Editors and Affiliations
Rights and permissions
Copyright information
© 2008 Springer-Verlag Berlin Heidelberg
About this paper
Cite this paper
Castillo, J.L., Garcia-Ybarra, P.L. (2008). Transport of Particles and Vapors in Flue Gases and Deposition on Cold Surfaces. In: Bonilla, L.L., Moscoso, M., Platero, G., Vega, J.M. (eds) Progress in Industrial Mathematics at ECMI 2006. Mathematics in Industry, vol 12. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-540-71992-2_36
Download citation
DOI: https://doi.org/10.1007/978-3-540-71992-2_36
Publisher Name: Springer, Berlin, Heidelberg
Print ISBN: 978-3-540-71991-5
Online ISBN: 978-3-540-71992-2
eBook Packages: Mathematics and StatisticsMathematics and Statistics (R0)