Evolution of the Surface Area of Limestone during Calcination and Sintering

DOI: 10.4236/jpee.2015.34009   PDF   HTML     5,281 Downloads   5,888 Views   Citations

Abstract

The calcination reaction of limestone is always companied by sintering of the calcined product. In addition, accelerated sintering rates and a reduced specific surface area are observed in the presence of steam and carbon dioxide. To simulate the change of surface area and the porosity of limestone samples in a simultaneous calcination and sintering process, a combined model based on both a sintering model and a calcination model is established. The calcination model, which predicts calcination conversion as a function of time, is based on the initial properties of the sorbent. The sintering model is according to the German and Munir model in which the main transport mechanism is supposed to be lattice diffusion. In a flow reactor, the surface area value and calcination rate of limestone in the presence of steam and CO2 are also described by the combined model with modified parameters.

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Liu, Y. and Yang, Y. (2015) Evolution of the Surface Area of Limestone during Calcination and Sintering. Journal of Power and Energy Engineering, 3, 56-62. doi: 10.4236/jpee.2015.34009.

Conflicts of Interest

The authors declare no conflicts of interest.

References

[1] Beruto, D., Barco, L. and Searcy, A.W. (1983) Rearrangement of Porous CaO Aggregates during Calcite Decomposition in Vacuum. Journal of the American Ceramic Society, 66, 893-896. http://dx.doi.org/10.1111/j.1151-2916.1983.tb11008.x
[2] Powell, E.K. and Searcy, A.W. (1982) Surface Areas and Mor-phologies of CaO Produced by Decomposition of Large CaCO3 Crystals in Vacuum. Journal of the American Ceramic Society, 65, C42-C44. http://dx.doi.org/10.1111/j.1151-2916.1982.tb10395.x
[3] Beruto, D., Barco, L., et al. (1980) Characterization of the Porous CaO Particles Formed by Decomposition of CaCO3 and Ca(OH)2 in Vacuum. Journal of the American Ceramic Society, 63, 439-443. http://dx.doi.org/10.1111/j.1151-2916.1980.tb10208.x
[4] Chan, R.K., Murthi, K.S. and Harrison, D. (1970) Thermogra-vimetric Analysis of Ontario Limestone and Dolomites. 1. Calcination, Surface Area and Porosity. Canadian Journal of Chemistry, 48, 2972-2978. http://dx.doi.org/10.1139/v70-503
[5] Fennell, P.S., Pacciani, R., et al. (2007) The Effects of Repeated Cycles of Calcination and Carbonation on a Variety of Different Limestones, as Measured in a Hot Fluidized Bed of Sand. Energy Fuels, 21, 2072-2081. http://dx.doi.org/10.1021/ef060506o
[6] Sun, P., Grace, J.R., et al. (2007) The Effect of CaO Sintering on Cyclic CO2 Capture in Energy Systems. AIChE Journal, 53, 2432-2442. http://dx.doi.org/10.1002/aic.11251
[7] Borgwardt, R.H., Bruce, K.R., et al. (1987) An Investigation of Product-Layer Diffusivity for CaO Sulfation. Industrial & Engineering Chemistry Research, 26, 1993-1998. http://dx.doi.org/10.1021/ie00070a010
[8] Manovic, V., Anthony, E.J., et al. (2008) CO2 Looping Cycle Performance of a High-Purity Limestone after Thermal Activation/Doping. Energy Fuels, 22, 3258-3264. http://dx.doi.org/10.1021/ef800316h
[9] Borgwardt, R.H. (1989) Sintering of Nascent Calcium-Oxide. Chemical Engi-neering Science, 44, 53-60. http://dx.doi.org/10.1016/0009-2509(89)85232-7
[10] German, R.M. and Munir, Z.A. (1976) Surface-Area Reduction during Isothermal Sintering. Journal of the American Ceramic Society, 59, 379-383. http://dx.doi.org/10.1111/j.1151-2916.1976.tb09500.x
[11] Borgwardt, R.H. and Bruce, K.R. (1986) Effect of Specific Sur-face Area on the Reactivity of CaO with SO2. AIChE Journal, 32, 239-246. http://dx.doi.org/10.1002/aic.690320210
[12] Beruto, D. and Searcy, A.W. (1974) Use of the Langmuir Method for Kinetic Studies of Decomposition Reactions: Calcite (CaCO3). Journal of the Chemical Society, Faraday Transactions 1: Physical Chemistry in Condensed Phases, 70, 2145-2153. http://dx.doi.org/10.1039/f19747002145
[13] Borgwardt, R.H. (1985) Cal-cination Kinetics and Surface-Area of Dispersed Limestone Particles. AIChE Journal, 31, 103-111. http://dx.doi.org/10.1002/aic.690310112
[14] Milne, C.R., Silcox, G.D., et al. (1990) Calcination and Sintering Models for Application to High-Temperature, Short- Time Sulfation of Calcium-Based Sorbents. Industrial & Engineering Chemistry Research, 29, 139-149. http://dx.doi.org/10.1021/ie00098a001
[15] Anderson, P.J., Horlock, R.F., et al. (1965) Some Effects of Water Vapour during the Preparation and Calcination of Oxide Powders. Proc. Br. Ceram. Soc, 3, 33.
[16] Beruto, D., Barco, L., et al. (1984) CO2-Catalyzed Surface-Area and Porosity Changes in High-Surface-Area CaO Aggregates. Journal of the American Ceramic Society, 67, 512-515. http://dx.doi.org/10.1111/j.1151-2916.1984.tb19644.x
[17] Borgwardt, R.H. (1989) Calcium-Oxide Sintering in Atmospheres Containing Water and Carbon-Dioxide. Industrial & Engineering Chemistry Research, 28, 493-500. http://dx.doi.org/10.1021/ie00088a019
[18] Bortz, S.T., Roman, V.P., et al. (1986) Precalcination and Its Effect on Sorbent Utilization during Upper Furnace Injection.

  
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