Vol. 56

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2013-10-22

Finite Element Modeling of Selective Heating in Microwave Pyrolysis of Lignocellulosic Biomass

By Baishali Dutta, Satyanarayan R. S. Dev, and Vijaya G. S. Raghavan
Progress In Electromagnetics Research B, Vol. 56, 1-24, 2013
doi:10.2528/PIERB13082502

Abstract

Microwave pyrolysis overcomes the disadvantages of conventional pyrolysis methods by efficiently improving the quality of final pyrolysis products. Biochar, one of the end products of this process is considered an efficient vector for sequestering carbon to offset atmospheric carbon dioxide. The dielectric properties of the doping agents (i.e., char and graphite) were assessed over the range of 25°-400°C and used to develop a finite element model (FEM). This model served to couple electromagnetic heating, combustion, and heat and mass transfer phenomena and evaluated the advantages of selective heating of woody biomass during microwave pyrolysis. The dielectric properties of the doping agents were a function of temperature and decreased up to 100°C and thereafter remained constant. Regression analysis indicated that char would be a better doping substance than graphite. The simulation study found that doping helped to provide a more efficient heat transfer within the biomass compared to non-doped samples. Char doping yielded better heat transfer compared to graphite doping, as it resulted in optimal temperatures for maximization of biochar production. The model was then validated through experimental trials in a custom-built microwave pyrolysis unit which confirmed that char doping would be better suited for maximization of biochar.

Citation


Baishali Dutta, Satyanarayan R. S. Dev, and Vijaya G. S. Raghavan, "Finite Element Modeling of Selective Heating in Microwave Pyrolysis of Lignocellulosic Biomass," Progress In Electromagnetics Research B, Vol. 56, 1-24, 2013.
doi:10.2528/PIERB13082502
http://test.jpier.org/PIERB/pier.php?paper=13082502

References


    1. Intergovernmental Panel on Climate Change (IPCC), "IPCC fourth assessment report: Climate change 2007,", 2013.
    doi:http://www.ipcc.ch/publications and data/publications and data

    2. Climate Change, Government of Canada, "Canada's action on climate change,", 2013.
    doi:http://www.climatechange.gc.ca/default.asp?lang=En&n=72F16 A84-1

    3. Environment Canada, "National inventory report 1990--2011: Greenhouse gas sources and sinks in Canada --- Executive summary,", 2013.
    doi:http://www.ec.gc.ca/gesghg/default.asp?lang=En&n=68EE206C-1&ofse

    4. Agriculture and Agri Food Canada (AAFC), "Agriculture residue,", 2008.
    doi:http://www4.agr.gc.ca/AAFC-AAC/display-a±cher.do?id=122651040602

    5. Statistics Canada, "Human activity and the environment: Annual statistics," Catalogue No. 16-201-X, 2009, 2013.
    doi:http://www.statcan.gc.ca/pub/16-201-x/16-201-x2009000-eng.pdf

    6. Wu, H. and H. Abdullah, "Biochar as a fuel: 1. Properties andgrindability of biochars produced from the pyrolysis of Mallee wood under slow-heating conditions," Energy & Fuels, Vol. 23, No. 8, 4174-4181, 2009.
    doi:DOI: 10.1021/ef900494t

    7. Lehmann, J., "Bio-energy in the black," Frontiers in Ecology and the Environment, Vol. 5, No. 7, 381-387, 2007.
    doi:10.1890060133

    8. Joseph, S., C. Peacocke, J. Lehmann, and P. Munroe, "Developing a biochar classification and test methods," Biochar for Environmental Management, Science and Technology, 107-126, 2009.
    doi:10.1080/02773813.2011.607535

    9. Kleiner, K., "The bright prospect of biochar," Nature Reports Climate Change, Vol. 3, 2009.
    doi:DOI:10.1038/climate.2009.48

    10. International Biochar Initiative (IBI), "Biochar is a valuable soil additive,", 2010, 2013.
    doi:http://www.biochar-international.org/biochar

    11. Brownsort, P. A., "Biomass pyrolysis processes: Performance parameters and their influence on biochar system benefits," M.Sc. thesis, School of Geosciences, University of Edinburgh, 2009, 2013.
    doi:http://hdl.handle.net/1842/3116

    12. Dutta, B., G. S. V. Raghavan, and M. Ngadi, "Surface characterization and classification of slow and fast pyrolysed biochar using novel methods of pycnometry and hyper-spectral imaging," Journal of Wood Chemistry and Technology, Vol. 32, No. 2, 105-120, 2011.
    doi:DOI: 10.1080/02773813.2011.607535

    13. Copson, D. A., Microwave Heating, 2nd Ed., xi-615, Avi Pub. Co., Westport, Conn., 1975.
    doi:10.1016/S0165-2370(98)00079-5

    14. Metaxas, A. C., Foundations of Electroheat. A Unified Approach, 400, John Wiley & Sons, Baffins Lane, Chichester, West Sussex, 1996.

    15. Thostenson, E. T. and T. W. Chow, "Microwave processing: Fundamentals and applications," Composites: Part A, Vol. 30, 1055-1071, 1999.
    doi:10.2529/PIERS090320171147

    16. Babu, B. V. and A. S. Chaurasia, "Pyrolysis of biomass: Improved models for simultaneous kinetics and transport of heat, mass and momentum," Energy Conversion and Management, Vol. 45, No. 9--10, 1297-1327, 2004.
    doi:DOI: 10.1016/j.enconman.2003.09.013

    17. Blasi, D., "Comparison of semi-global mechanisms for primary pyrolysis of lignocellulosic fuels," Journal of Analytical and Applied Pyrolysis, Vol. 47, No. 1, 43-64, 2008.
    doi:DOI: 10.1016/S0165-2370(98)00079-5

    18. Dutta, B., S. R. S. Dev, Y. Gariepy, and G. S. V. Raghavan, "Finite element modelling of microwave pyrolysis of biomass," Proceedings of 7th International Conference on Heat Transfer, Fluid Mechanics and Thermodynamics (HEFAT), 2010.
    doi:10.1021/ie901336k

    19. Dev, S. R. S., Y. Gariepy, and G. S. V. Raghavan, "Measurement of dielectric properties and finite element simulation of microwave pretreatment for convective drying of grapes," PIERS Online, Vol. 5, No. 7, 690-690, 2009.

    20. Delisle, G. Y., K. L. Wu, and J. Litva, "Couples finite element and boundary element method in electromagnetics," Comp. Phys. Commun., Vol. 68, No. 1--3, 255-278, 1991.
    doi:DOI: 10.1016/0010-4655(91)90203-W

    21. Dev, S. R. S., Y. Gariepy, V. Orsat, and G. S. V. Raghavan, "FDTD modeling and simulation of microwave heating of in-shell eggs," Progress In Electromagnetics Research M, Vol. 13, 229-243, 2010.

    22. Sanga, E. C. M., "Microwave assisted drying of composite materials: Modelling and experimental validation," Dissertation --- Master's Thesis, McGill University, | Master.

    23. Robinson, J. P., S. W. Kingman, R. C. Barranco, E. Snape, and H. Al-Sayegh, "Microwave pyrolysis of wood pellets," Ind. Eng. Chem. Res., Vol. 49, No. 2, 459-463, 2010.
    doi:DOI: 10.1021/ie901336k

    24. Al-Sayegh, H., J. Robinson, G. Dimitrakis, and S. Kingman, "Microwave processing of forestry waste," IET RF and Microwave Network and National Centre for Industrial Microwave Processing (NCIMP), 2010.

    25. Dominguez, A., et al., "Conventional and microwave induced pyrolysis of coffee hulls for the production of a hydrogen rich fuel gas," J. Anal. Appl. Pyrolysis, Vol. 79, No. 1--2, 128-135, 128.
    doi:DOI: 10.1016/j.jaap.2006.08.003

    26. Goss, W. P. and R. G. Miller, "Thermal properties of wood and wood products," Proceedings of the Thermal Performance of the Exterior Envelopes of Whole Buildings International Conference, 1992, 2013.
    doi:http://web.ornl.gov/sci/buildings/2012/1992%20B5/028.pdf

    27. Center for Solid State Science, "Mass density in Engineered materials," Arizona State University, 2013.
    doi:http://invsee.asu.edu/nmodules/engmod/propdensity.html

    28. Picard, S., D. T. Burns, and P. Roger, "Measurement of the specific heat capacity of graphite," Rapport BIPM-2006/01, 2006.
    doi:www.bipm.org/utils/common/pdf/rapportBIPM/2006/01.pdf.

    29. Clark, R. N., "Dielectric properties of materials," Kaye and Laby Online: Tables of Physical and Chemical Constants, 1995, 2013.
    doi:http://www.kayelaby.npl.co.uk/general physics/2_6/2 6 5.html

    30. Ida, N., "Magnetic properties of materials," Engineering Electromagnetics, 2004.

    31. Ayappa, K. G., H. T. Davis, E. A. Davis, and J. Gordon, "Two-dimensional finite element analysis of microwave heating," AIChE Journal, Vol. 38, No. 10, 1577-1592, 1992.
    doi:DOI: 10.1002/aic.690381009

    32. Zheng, F., Z. Chen, and J. Zhang, "Toward the development of a three-dimensional unconditionally stable finite-difference time-domain method," IEEE Transactions on Microwave Theory And Techniques, Vol. 48, No. 9, 1550-1558, 2000.
    doi:DOI: 10.1109/22.869007

    33. COMSOL Multiphysics, "Chemical reaction engineering module (Version 4.1a),", 2012.
    doi:http://www.comsol.com/

    34. Zuo, W., Y. Tian, and R. Ren, "The important role of microwave receptors in bio-fuel production by microwave-induced pyrolysis of sewage sludge," Waste Management, Vol. 31, 1321-1326, 2011.

    35. Fernandez, Y., A. Arenillas, and J. A. Menendez, "Microwave heating applied to pyrolysis," Advances in Induction and Microwave Heating of Mineral and Organic Materials, 724-752, 2011.
    doi:DOI: 10.5772/13548

    36. Oloyede, A. and P. Groombridge, "The influence of microwave heating on the mechanical properties of wood," Journal of Materials Processing Technology, Vol. 100, 67-73, 2000.
    doi:10.1016/S0021-9673(03)01176-2

    37. Yu, F., P. H. Steele, and R. Ruan, "Microwave pyrolysis of corn cob and characteristics of the pyrolytic chars," Energy Sources , Vol. 32, 475-484, 2010.

    38. Demirbas, A., "Effects of temperature and particle size on biochar yield from pyrolysis of agricultural residues," J. Anal. Appl. Pyrolysis, Vol. 72, 243-248, 2004.

    39. Dutta, B., "Assessment of pyrolysis techniques of lignocellulosic biomass for biochar production," Dissertation --- Master's Thesis, McGill University, 2010.

    40. Uemura, Y., W. N. Omar, S. Razlan, H. Mif, S. Yusup, and K. Onoe, "Mass and energy yields of bio-oil obtained by microwave-induced pyrolysis of oil palm kernel shell," Journal of the Japan Insdture of Energy, Vol. 91, 954-959, 2012.

    41. Dominguez, A., J. A. Menendez, M. Inguanzo, P. L. Bernad, and J. J. Pis, "Gas chromatographic-mass spectrometric study of the oil fractions produced by microwave-assisted pyrolysis of different sewage sludges," Journal of Chromatography A, Vol. 1012, No. 2, 193-206, 2003.
    doi:DOI: 10.1016/S0021-9673(03)01176-2