Share This Article:

Mathematical Modelling of Biomass Gasification in a Circulating Fluidized Bed CFB Reactor

Abstract Full-Text HTML Download Download as PDF (Size:564KB) PP. 160-169
DOI: 10.4236/jsbs.2012.24022    5,859 Downloads   11,784 Views   Citations

ABSTRACT

The scope of the present paper is to investigate the suitability of a mathematical model for Circulating Fluidized Bed (CFB) coal combustion (developed by the International Energy Agency), to predict and simulate the performance of the 100 kWth CFB for air-blown biomass gasification. The development of a mathematical model allows to simulate the operative conditions during biomass gasification, control the quality of the synthesis gas and improve the gasifier design. The geometrical, mechanical, hydro dynamical and thermo chemical features were introduced in the model by properly setting the input file and, some changes have been made in the code to assure the final convergence. A sensitivity analysis has been performed to study the variation in the input parameters of the program, and it has been finally verified by comparing the results with the empirical data collected during coal and wood combustion tests. The program, in the same case, could not successfully run; probably depending on wood char density value. For these reason the influence of char density will be investigated. The model predicts the development of tar and other hydrocarbons, valuating the agreement between the measured and calculated efficiency. A further development, to consider solid biomass, with a certain volatile percentages (20% - 40%), as a fuel has been previewed and analyzed. Finally some investigations have been carried out to provide some useful indications for future developments of the code, in the biomass gasification modelling

Conflicts of Interest

The authors declare no conflicts of interest.

Cite this paper

R. Capata and M. Veroli, "Mathematical Modelling of Biomass Gasification in a Circulating Fluidized Bed CFB Reactor," Journal of Sustainable Bioenergy Systems, Vol. 2 No. 4, 2012, pp. 160-169. doi: 10.4236/jsbs.2012.24022.

References

[1] J. Hannes, “Mathematical Modelling of Circulating Fluidized Bed Combustion,” Kartographie und Druck Peter List, Achen, 1996.
[2] M. Siedlecki, “Alkali Measurements: Start-Up of the CFB Combustor and Development of Gas Sample Procedure,” M.Sc. Thesis, Delft University of Technology, Delft, 2003.
[3] M. Siedlecki, K. Van der Nat, E. Simeone and W. De Jong, “The First Results of Gas and Solids Characterization Obtained during Steam-Oxygen Gasification of Biomass in a 100kWth CFB Gasifier,” World Renewable Energy Congress IX, Florence, 19-25 August 2006.
[4] D. Merrick, “Mathematical Models of the Thermal Decomposition of Coal. 1. The Evolution of Volatile Matters,” Fuel, Vol. 62, No. 5, 1983, pp. 534-539. doi:10.1016/0016-2361(83)90222-3
[5] J. F. Stubington and Sumaryono, “Release of Volatiles from Large Coal Particles in a Hot Fluidized Bed Fuel,” Vol. 63, No. 7, 1984, pp. 1013-1019. doi:10.1016/0016-2361(84)90327-2
[6] A. N. Hayhurst and A. D. Lawrence, “The Devolatilization of Coal and a Comparison of Chars Produced in Oxidizing and Inert Atmospheres in Fluidized Beds,” Combustion and flame, Vol. 100, No. 4, 1995, pp. 591-604.
[7] L. Devi, K. J. Ptasinski and F. J. J. G.Jansen. “A Review of the Primary Measures for Tar Elimination in Biomass Gasification Process,” Biomass and Bioenergy, Vol. 24, No. 2, 2003, pp. 125-140.
[8] P. Basu, “Combustion and gasification in fluidized beds,” Taylor and Francis, Oxford, 2006. doi:10.1201/9781420005158
[9] C. Franco, F. Pinto, I. Gulyurtlu and I. Cabrita, “The Study of Reactions Influencing the Biomass Steam Gasification Process,” Fuel, Vol. 82, No. 7, 2003, pp. 835-842.
[10] X. T. Li, J. R. Grace, C. J. Lim, A. P. Watkinson, H. P. Chen and J. R. Kim, “Biomass Gasification in a Circulating Fluidized Bed,” Biomass and Bioenergy, Vol. 26, No. 2, 2004, pp. 171-193.
[11] K. W. Ragland, D. J. Aerts and A. J. Baker, “Properties of Wood for Combustion Analysis,” Bioresource Technology, Vol. 37, No. 4, 1991, pp. 446-452.
[12] D. Merrick, “Mathematical Models of the Thermal Decomposition of Coal. 1. The Evolution of Volatile Matter,” Fuel, Vol. 62, No. 5, 1983, pp. 534-539. doi:10.1016/0016-2361(83)90222-3

  
comments powered by Disqus

Copyright © 2019 by authors and Scientific Research Publishing Inc.

Creative Commons License

This work and the related PDF file are licensed under a Creative Commons Attribution 4.0 International License.