Korean Chemical Engineering Research

The Korean Institute of Chemical Engineers (한국화학공학회)
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Migration of Alkali and Alkaline Earth Metallic Species and Structure Analysis of Sawdust Pyrolysis Biochar

  • Zhao, Yijun (School of Energy Science and Engineering, Harbin Institute of Technology) ;
  • Feng, Dongdong (School of Energy Science and Engineering, Harbin Institute of Technology) ;
  • Zhang, Yu (School of Energy Science and Engineering, Harbin Institute of Technology) ;
  • Tang, Wenbo (School of Energy Science and Engineering, Harbin Institute of Technology) ;
  • Meng, Shun (School of Energy Science and Engineering, Harbin Institute of Technology) ;
  • Guo, Yangzhou (School of Energy Science and Engineering, Harbin Institute of Technology) ;
  • Sun, Shaozeng (School of Energy Science and Engineering, Harbin Institute of Technology)
  • Received : 2016.03.13
  • Accepted : 2016.06.16
  • Published : 2016.10.01
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Abstract

In order to resolve the AAEM species migration routes and the interaction relationship between biochar structure and AAEM species during biomass pyrolysis, experiments were performed in an entrained flow reactor with $N_2$ at $500{\sim}900^{\circ}C$. ICP-AES, XPS and SEM-EDX were used to examine content and distribution of AAEM species and the physicochemical structures of biochar. The results show that at $500{\sim}700^{\circ}C$, the precipitation rate of AAEM species is relatively high. At high temperature (>$700^{\circ}C$), the AAEM species continue to migrate from interior to exterior, but little precipitation from biochar surface. And the migration of AAEM species is mainly realized by the C-O bond as the carrier medium. The AAEM species on biochar surface are mainly Na, Mg and Ca (<$700^{\circ}C$), while changing to K, Mg and Ca (${\geq}700^{\circ}C$). From $500^{\circ}C$ to $900^{\circ}C$, the biochar particle morphology gradually changes from fibers to porous structures, finally to molten particles. At $700{\sim}900^{\circ}C$, Ca element is obviously enriched on the molten edge of the biochar porous structures.

Keywords

References

  1. Basu, P., Biomass Gasification and Pyrolysis: Practical Design and Theory. Academic press: 2010.
  2. Sun, L. and Zhang, X., Biomass Pyrolysis Gasification Principle and Technology. Chemical Industry: 2013.
  3. Lin, X., Wang, C., Ideta, K., Jin, M., Nishiyama, Y., Wang, Y., Yoon, S. and Mochida, I., "Insights into the Functional Group Transformation of a Chinese Brown Coal During Slow Pyrolysis by Combining Various Experiments," Fuel, 118, 257-264(2014). https://doi.org/10.1016/j.fuel.2013.10.081
  4. Zhao, Y., Feng, D., Zhang, Y., Huang, Y. and Sun, S., "Effect of Pyrolysis Temperature on Char Structure and Chemical Speciation of Alkali and Alkaline Earth Metallic Species in Biochar," Fuel Processing Technology, 141, 54-60(2016). https://doi.org/10.1016/j.fuproc.2015.06.029
  5. Li, X., Hayashi, J. I. and Li, C. Z., "FT-Raman Spectroscopic Study of the Evolution of Char Structure During the Pyrolysis of a Victorian Brown Coal," Journal of Clinical Pathology, 2(12), 1700-1707(1969).
  6. Tyler, R. J. and Schafer, H. N. S., "Flash Pyrolysis of Coals: Influence of Cations on the Devolatilization Behaviour of Brown Coals," Fuel, 59(7), 487-494(1980). https://doi.org/10.1016/0016-2361(80)90175-1
  7. Tyler, R. J., "Flash Pyrolysis of Coals. 1. Devolatilization of a Victorian Brown Coal in a Small Fluidized-bed Reactor," Fuel, 58(9), 680-686(1979). https://doi.org/10.1016/0016-2361(79)90223-0
  8. Doolan, K. R., Mackie, J. C. and Tyler, R. J., "Coal Flash Pyrolysis: Secondary Cracking of Tar Vapours in the Range 870-2000 K," Fuel, 66(4), 572-578(1987). https://doi.org/10.1016/0016-2361(87)90166-9
  9. Doolan, K. R., Mackie, J. C., Mulcahy, M. F. R. and Tyler, R. J., "Kinetics of Rapid Pyrolysis and Hydropyrolysis of a Sub-bituminous Coal," Symposium on Combustion, 19(1), 1131-1138(1982).
  10. Solomon, P. R., Serio, M. A., Despande, G. V. and Kroo, E., "Crosslinking Reactions During Coal Conversion," Energy Fuels, 4(1), 42-54(1990). https://doi.org/10.1021/ef00019a009
  11. Wornat, M. J. and Nelson, P. F., "Oxygen-containing Gases from the Rapid Pyrolysis of a Brown Coal: The Effects of Ion-exchanged Calcium," Symposium on Combustion, 23(1), 1239-1245(1991). https://doi.org/10.1016/S0082-0784(06)80386-3
  12. Best, P. E., Solomon, P. R., Serio, M. A., Suuberg, E. M., Mott, W. R. and Bassilakis, R., "Relationship Between Char Reactivity and Physical and Chemical Structural Features," Prepr. Pap., Am. Chem. Soc., Div. Fuel Chem.; (United States), 32, 4(1987).
  13. Yeasmin, H., Mathews, J. F. and Ouyang, S., "Rapid Devolatilisation of Yallourn Brown Coal at High Pressures and Temperatures," Fuel, 78(1), 11-24(1999). https://doi.org/10.1016/S0016-2361(98)00119-7
  14. Hanson, J., "Primary Release of Alkali and Alkaline Earth Metallic Species during the Pyrolysis of Pulverized Biomass," Energy & Fuels, 19(5), 2164-2171(2005). https://doi.org/10.1021/ef050002a
  15. Jordan, C. A. and Akay, G., "Speciation and Distribution of Alkali, Alkali Earth Metals and Major Ash Forming Elements During Gasification of Fuel Cane Bagasse," Fuel, 91(1), 253-263(2012). https://doi.org/10.1016/j.fuel.2011.05.031
  16. Li, C.-Z., Sathe, C., Kershaw, J. and Pang, Y., "Fates and Roles of Alkali and Alkaline Earth Metals During the Pyrolysis of a Victorian Brown Coal," Fuel, 79(3), 427-438(2000). https://doi.org/10.1016/S0016-2361(99)00178-7
  17. Liu, W. J., Jiang, H., and Yu, H. Q., "Development of Biochar-Based Functional Materials: Toward a Sustainable Platform Carbon Material," Chemical Reviews, 115(22), 125-128(2015).
  18. Li, C.-Z., "Some Recent Advances in the Understanding of the Pyrolysis and Gasification Behaviour of Victorian Brown Coal," Fuel, 86(12), 1664-1683(2007). https://doi.org/10.1016/j.fuel.2007.01.008
  19. Li, C.-Z., "Importance of Volatile-char Interactions During the Pyrolysis and Gasification of Low-rank Fuels-a Review," Fuel, 112, 609-623(2013). https://doi.org/10.1016/j.fuel.2013.01.031
  20. Joyce, J., Dixon, T. and Costa, J. C. D. D., "Characterization of Sugar Cane Waste Biomass Derived Chars from Pressurized Gasification," Process Safety & Environmental Protection, 84(B6), 429-439(2006). https://doi.org/10.1205/psep05021
  21. Lapuerta, M., Hernandez, J. J., Pazo, A. and Lopez, J., "Gasification and co-gasification of Biomass Wastes: Effect of the BioMass Origin and the Gasifier Operating Conditions," Fuel Processing Technology, 89(9), 828-837(2010). https://doi.org/10.1016/j.fuproc.2008.02.001
  22. Matsuoka, K., Yamashita, T., Kuramoto, K., Suzuki, Y., Takaya, A. and Tomita, A., "Transformation of Alkali and Alkaline Earth Metals in Low Rank Coal During Gasification," Fuel, 87(6), 885-893(2008). https://doi.org/10.1016/j.fuel.2007.05.031
  23. Song, H., Xiang, J., Sun, L., Xu, M., Qiu, J. and Peng, F., "Characterization of Char from Rapid Pyrolysis of Rice Husk," Fuel Processing Technology, 89(11), 1096-1105(2008). https://doi.org/10.1016/j.fuproc.2008.05.001
  24. Li, D., Xu, G., Suda, T. and Murakami, T., "Potential Approaches to Improve Gasification of High Water Content Biomass Rich in Cellulose in Dual Fluidized Bed," Fuel Processing Technology, 91(91), 882-888(2010). https://doi.org/10.1016/j.fuproc.2009.12.012

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