CFD Modeling of Devolatilization and Combustion of Shredded Tires and Pine Wood in Rotary Cement Kilns

Peter Mtui

doi:doi:10.11648/j.ajee.20130105.11

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CFD Modeling of Devolatilization and Combustion of Shredded Tires and Pine Wood in Rotary Cement Kilns

Peter Mtui

Published in American Journal of Energy Engineering (Volume 1, Issue 5)

Received: 25 September 2013 Published: 10 November 2013

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Abstract

Computational fluid dynamics (CFD) has been used to study the devolatilization and combustion of large particles of shredded scrap tire “rubber” and pulverized pine wood “biomass” in a rotary cement kilns. The CFD model constitutes of modeling the hydrodynamics within the rotary kiln, heat transfer, devolatilization and co-combustion of rubber and biomass blends. Equivalent particle diameters of 1 mm and 2 mm for biomass and rubber, respectively, were used to simulate the process conditions and co-combustion in cement rotary kilns. The ratios of biomass substitution were varied from 5% to 20% on mass basis. The effect of the percentage of biomass content on the temperature distribution and devolatilization rate as well as wall heat transfer rate are presented. Results indicate that up to 20% biomass blend provides improved combustion characteristics compared with combustion of scrap tire alone. Further, the devolatilization rate was found to improve remarkably when scrap tire is blended with biomass. Most importantly, the biomass blend was found to increase the flame spreading and penetration, consequently improving the wall heat transfer rate, therefore providing favorable conditions for heat transfer to the cement clinker. The present study provides additional knowledge for future investigations on the use of biomass residues and some industrial wastes as alternative fuels for rotary cement kilns. That is, the use of alternative fuels in rotary cement kilns has a potential for economic improvement and environmental sustainability.

Published in	American Journal of Energy Engineering (Volume 1, Issue 5)
DOI	10.11648/j.ajee.20130105.11
Page(s)	51-55
Creative Commons	This is an Open Access article, distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution and reproduction in any medium or format, provided the original work is properly cited.
Copyright	Copyright © The Author(s), 2013. Published by Science Publishing Group

Keywords

CFD, Rotary Kiln, Scrap Tire, Biomass, Devolatilization, Combustion

References

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[2]	Cembureau,: Alternative Fuels in Cement Manufacture; 1997, http://www.cembureau.be
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[4]	G. Genon and E. Brizio, "Perspectives and limits for cement kilns as a destination for RDF," Waste Management, Vol. 28, no. 11, pp. 2375–2385, Nov. 2008.
[5]	U. Kaantee, R. Zevenhoven, R. Backman and M. Hupa, "Cement manufacturing using alternative fuels and the advantages of process modelling," Fuel Processing Technology, Vol. 85, no. 4, pp. 293-301, Mar. 2004.
[6]	Conesa J.A., Font R., Marcilla R. Mass spectrometry validation of a kinetic model for the thermal decomposition of tyre wastes. Journal of Analytical and Applied Pyrolysis 43; pp. 83-96; 1997.
[7]	Yang J., Tanguy P. A., Roy C. Heat transfer, mass transfer and kinetics study of the vacuum pyrolysis of a large used tire particle. Chemical Engineering Science 50; pp. 1909-1922; 1995.
[8]	Larsen, M. B.; Schultz, L.; Glarborg, P.; Skaarup-Jensen, L.; Dam-Johansen, K.; Frandsen, F.; Henriksen, U. Fuel 2006, 85, 1335−1345.
[9]	Chinyama, M. P. M; Lockwood, F. C. J. Energy Inst. 2007, 80 (3), 162−167
[10]	Atal, A.; Levendis, Y. A. Fuel 1995, 74 (11), 1570−1581
[11]	de Diego L. F., F. García-Labiano, A. Abad, P. Gayán, J. Adánez Coupled drying and devolatilization of non-spherical wet pine wood particles in fluidized beds. Journal of Analytical and Applied Pyrolysis 65 (2002) 173–184
[12]	Di Blasi, C.; Branca, C. Energy Fuels 2003, 17, 247−254
[13]	C. Di Blasi, Modeling chemical and physical processes of wood and biomass pyrolysis, Progress in Energy and Combustion Science 34 (2008) 47–90
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[15]	M. Juma, Z. Koreňová, J. Marks, J. Annus, L. Jelemensky. Pyrolysis and Combustion of Scrap Tires Petroleum & Coal 48 (1), 15-26, 2006
[16]	H. Kobayashi, J. B. Howard, and A. F. Saro Coal Devolatilization at High Temperatures. In 16th Symp. (Int'l.) on Combustion. The Combustion Institute, 1976
[17]	Braum M. M. and P. J. Street. Predicting the Combustion Behaviour of Coal Particles. Combustion Science and Technology, 3(5), 231-243. (1971)
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Peter Mtui. (2013). CFD Modeling of Devolatilization and Combustion of Shredded Tires and Pine Wood in Rotary Cement Kilns. American Journal of Energy Engineering, 1(5), 51-55. https://doi.org/10.11648/j.ajee.20130105.11

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ACS Style

Peter Mtui. CFD Modeling of Devolatilization and Combustion of Shredded Tires and Pine Wood in Rotary Cement Kilns. Am. J. Energy Eng. 2013, 1(5), 51-55. doi: 10.11648/j.ajee.20130105.11

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AMA Style

Peter Mtui. CFD Modeling of Devolatilization and Combustion of Shredded Tires and Pine Wood in Rotary Cement Kilns. Am J Energy Eng. 2013;1(5):51-55. doi: 10.11648/j.ajee.20130105.11

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@article{10.11648/j.ajee.20130105.11,
  author = {Peter Mtui},
  title = {CFD Modeling of Devolatilization and Combustion of Shredded Tires and Pine Wood in Rotary Cement Kilns},
  journal = {American Journal of Energy Engineering},
  volume = {1},
  number = {5},
  pages = {51-55},
  doi = {10.11648/j.ajee.20130105.11},
  url = {https://doi.org/10.11648/j.ajee.20130105.11},
  eprint = {https://article.sciencepublishinggroup.com/pdf/10.11648.j.ajee.20130105.11},
  abstract = {Computational fluid dynamics (CFD) has been used to study the devolatilization and combustion of large particles of shredded scrap tire “rubber” and pulverized pine wood “biomass” in a rotary cement kilns. The CFD model constitutes of modeling the hydrodynamics within the rotary kiln, heat transfer, devolatilization and co-combustion of rubber and biomass blends. Equivalent particle diameters of 1 mm and 2 mm for biomass and rubber, respectively, were used to simulate the process conditions and co-combustion in cement rotary kilns. The ratios of biomass substitution were varied from 5% to 20% on mass basis. The effect of the percentage of biomass content on the temperature distribution and devolatilization rate as well as wall heat transfer rate are presented.  Results indicate that up to 20% biomass blend provides improved combustion characteristics compared with combustion of scrap tire alone. Further, the devolatilization rate was found to improve remarkably when scrap tire is blended with biomass.  Most importantly, the biomass blend was found to increase the flame spreading and penetration, consequently improving the wall heat transfer rate, therefore providing favorable conditions for heat transfer to the cement clinker. The present study provides additional knowledge for future investigations on the use of biomass residues and some industrial wastes as alternative fuels for rotary cement kilns.  That is, the use of alternative fuels in rotary cement kilns has a potential for economic improvement and environmental sustainability.},
 year = {2013}
}

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TY  - JOUR
T1  - CFD Modeling of Devolatilization and Combustion of Shredded Tires and Pine Wood in Rotary Cement Kilns
AU  - Peter Mtui
Y1  - 2013/11/10
PY  - 2013
N1  - https://doi.org/10.11648/j.ajee.20130105.11
DO  - 10.11648/j.ajee.20130105.11
T2  - American Journal of Energy Engineering
JF  - American Journal of Energy Engineering
JO  - American Journal of Energy Engineering
SP  - 51
EP  - 55
PB  - Science Publishing Group
SN  - 2329-163X
UR  - https://doi.org/10.11648/j.ajee.20130105.11
AB  - Computational fluid dynamics (CFD) has been used to study the devolatilization and combustion of large particles of shredded scrap tire “rubber” and pulverized pine wood “biomass” in a rotary cement kilns. The CFD model constitutes of modeling the hydrodynamics within the rotary kiln, heat transfer, devolatilization and co-combustion of rubber and biomass blends. Equivalent particle diameters of 1 mm and 2 mm for biomass and rubber, respectively, were used to simulate the process conditions and co-combustion in cement rotary kilns. The ratios of biomass substitution were varied from 5% to 20% on mass basis. The effect of the percentage of biomass content on the temperature distribution and devolatilization rate as well as wall heat transfer rate are presented.  Results indicate that up to 20% biomass blend provides improved combustion characteristics compared with combustion of scrap tire alone. Further, the devolatilization rate was found to improve remarkably when scrap tire is blended with biomass.  Most importantly, the biomass blend was found to increase the flame spreading and penetration, consequently improving the wall heat transfer rate, therefore providing favorable conditions for heat transfer to the cement clinker. The present study provides additional knowledge for future investigations on the use of biomass residues and some industrial wastes as alternative fuels for rotary cement kilns.  That is, the use of alternative fuels in rotary cement kilns has a potential for economic improvement and environmental sustainability.
VL  - 1
IS  - 5
ER  -

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Author Information

Peter Mtui

College of Engineering and Technology, University of Dar es Salaam, ar es Salaam, Tanzania

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Plain Text BibTeX RIS

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Peter Mtui. (2013). CFD Modeling of Devolatilization and Combustion of Shredded Tires and Pine Wood in Rotary Cement Kilns. American Journal of Energy Engineering, 1(5), 51-55. https://doi.org/10.11648/j.ajee.20130105.11

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ACS Style

Peter Mtui. CFD Modeling of Devolatilization and Combustion of Shredded Tires and Pine Wood in Rotary Cement Kilns. Am. J. Energy Eng. 2013, 1(5), 51-55. doi: 10.11648/j.ajee.20130105.11

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AMA Style

Peter Mtui. CFD Modeling of Devolatilization and Combustion of Shredded Tires and Pine Wood in Rotary Cement Kilns. Am J Energy Eng. 2013;1(5):51-55. doi: 10.11648/j.ajee.20130105.11

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@article{10.11648/j.ajee.20130105.11,
  author = {Peter Mtui},
  title = {CFD Modeling of Devolatilization and Combustion of Shredded Tires and Pine Wood in Rotary Cement Kilns},
  journal = {American Journal of Energy Engineering},
  volume = {1},
  number = {5},
  pages = {51-55},
  doi = {10.11648/j.ajee.20130105.11},
  url = {https://doi.org/10.11648/j.ajee.20130105.11},
  eprint = {https://article.sciencepublishinggroup.com/pdf/10.11648.j.ajee.20130105.11},
  abstract = {Computational fluid dynamics (CFD) has been used to study the devolatilization and combustion of large particles of shredded scrap tire “rubber” and pulverized pine wood “biomass” in a rotary cement kilns. The CFD model constitutes of modeling the hydrodynamics within the rotary kiln, heat transfer, devolatilization and co-combustion of rubber and biomass blends. Equivalent particle diameters of 1 mm and 2 mm for biomass and rubber, respectively, were used to simulate the process conditions and co-combustion in cement rotary kilns. The ratios of biomass substitution were varied from 5% to 20% on mass basis. The effect of the percentage of biomass content on the temperature distribution and devolatilization rate as well as wall heat transfer rate are presented.  Results indicate that up to 20% biomass blend provides improved combustion characteristics compared with combustion of scrap tire alone. Further, the devolatilization rate was found to improve remarkably when scrap tire is blended with biomass.  Most importantly, the biomass blend was found to increase the flame spreading and penetration, consequently improving the wall heat transfer rate, therefore providing favorable conditions for heat transfer to the cement clinker. The present study provides additional knowledge for future investigations on the use of biomass residues and some industrial wastes as alternative fuels for rotary cement kilns.  That is, the use of alternative fuels in rotary cement kilns has a potential for economic improvement and environmental sustainability.},
 year = {2013}
}

Copy | Download

TY  - JOUR
T1  - CFD Modeling of Devolatilization and Combustion of Shredded Tires and Pine Wood in Rotary Cement Kilns
AU  - Peter Mtui
Y1  - 2013/11/10
PY  - 2013
N1  - https://doi.org/10.11648/j.ajee.20130105.11
DO  - 10.11648/j.ajee.20130105.11
T2  - American Journal of Energy Engineering
JF  - American Journal of Energy Engineering
JO  - American Journal of Energy Engineering
SP  - 51
EP  - 55
PB  - Science Publishing Group
SN  - 2329-163X
UR  - https://doi.org/10.11648/j.ajee.20130105.11
AB  - Computational fluid dynamics (CFD) has been used to study the devolatilization and combustion of large particles of shredded scrap tire “rubber” and pulverized pine wood “biomass” in a rotary cement kilns. The CFD model constitutes of modeling the hydrodynamics within the rotary kiln, heat transfer, devolatilization and co-combustion of rubber and biomass blends. Equivalent particle diameters of 1 mm and 2 mm for biomass and rubber, respectively, were used to simulate the process conditions and co-combustion in cement rotary kilns. The ratios of biomass substitution were varied from 5% to 20% on mass basis. The effect of the percentage of biomass content on the temperature distribution and devolatilization rate as well as wall heat transfer rate are presented.  Results indicate that up to 20% biomass blend provides improved combustion characteristics compared with combustion of scrap tire alone. Further, the devolatilization rate was found to improve remarkably when scrap tire is blended with biomass.  Most importantly, the biomass blend was found to increase the flame spreading and penetration, consequently improving the wall heat transfer rate, therefore providing favorable conditions for heat transfer to the cement clinker. The present study provides additional knowledge for future investigations on the use of biomass residues and some industrial wastes as alternative fuels for rotary cement kilns.  That is, the use of alternative fuels in rotary cement kilns has a potential for economic improvement and environmental sustainability.
VL  - 1
IS  - 5
ER  -

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