Korean Chemical Engineering Research

The Korean Institute of Chemical Engineers (한국화학공학회)
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Pyrolysis, Partial Oxidation, and Combustion Characteristics of Micro Algae

미세 조류의 열분해, 부분산화, 연소 특성 연구

  • Seo, Myung Won (Department of Chemical and Biomolecular Engineering, Energy and Environment Research Center, Korea Advanced Institute of Science and Technology(KAIST)) ;
  • Kim, Sang Done (Department of Chemical and Biomolecular Engineering, Energy and Environment Research Center, Korea Advanced Institute of Science and Technology(KAIST)) ;
  • Na, Jeong Geol (Gasification Research Group, Korea Institute of Energy Research(KIER)) ;
  • Lee, See Hoon (Gasification Research Group, Korea Institute of Energy Research(KIER))
  • 서명원 (한국과학기술원 생명화학공학과 및 에너지환경연구센터) ;
  • 김상돈 (한국과학기술원 생명화학공학과 및 에너지환경연구센터) ;
  • 나정걸 (한국에너지기술연구원 가스화연구그룹) ;
  • 이시훈 (한국에너지기술연구원 가스화연구그룹)
  • Received : 2009.10.07
  • Accepted : 2009.10.21
  • Published : 2009.12.31
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Abstract

Characteristics of pyrolysis, partial oxidation, combustion of chlorella, which is one species of micro-algae, were determined by using thermobalance reactor(I.D. 5.5 cm, Height 1 m). Effect of reaction temperature($500{\sim}800^{\circ}C$), water content in chlorella(0~60%), and oxygen content(0~21vol%) on thermal decomposition of chlorella were also determined and analyzed to investigate the kinetic characteristics of pyrolysis, partial oxidation and combustion. As the temperature and partial pressure increases, the carbon conversion increases. In case of pyrolysis, carbon conversion and reactivity sharply decreased with increasing moisture content. However, carbon conversion and reactivity decreased at 60% water content in case of partial oxidation and combustion. As reaction temperature and oxygen content increased, carbon conversion increased and the combustion reaction rate equation for chlorella has been presented. $\frac{dX}{dt}=(7.41{\times}10^{-1})$exp$\left(-\frac{19600}{RT}\right)(P_{O_{2}})^{0.209}(1-X)^{2/3}$.

미세 조류의 열화학적 반응 특성을 고찰하기 위하여 열중량 반응기(I.D. 5.5 cm, Height 1 m)를 이용하여 클로렐라의 열분해, 연소, 부분 산화에 따른 실험을 수행하였다. 반응 온도($500{\sim}800^{\circ}C$), 클로렐라의 수분 함유량(0~60%), 산소 농도(0~21%)에 따른 클로렐라의 무게 감량 변화를 관찰하였으며 이를 이용하여 열분해, 연소, 부분 산화 반응 특성을 고찰하였다. 수분 함량이 증가함에 따라 탄소 전환율과 반응성이 감소하는 경향이 발견되었다. 열분해의 경우, 건조 시료(수분 함량 0%)에 비하여 수분 함량이 늘어남에 따라 탄소 전환율과 반응성이 급격하게 감소한 반면, 부분 산화(5%) 및 연소의 경우에는 수분 함량이 60%가 되면서 탄소 전환율 및 반응성이 감소하는 경향이 발견되었다. 반응온도 및 산소의 분압이 증가함에 따라 탄소 전환율은 증가하는 경향을 보였으며 chlorella의 연소 반응식은 다음과 같다. $\frac{dX}{dt}=(7.41{\times}10^{-1})$exp$\left(-\frac{19600}{RT}\right)(P_{O_{2}})^{0.209}(1-X)^{2/3}$.

Keywords

References

  1. Lee, S. H., Choi, K. B., Lee, J. G. and Kim, J. H., "Gasification Characteristics of Combustible Wastes in a 5 ton/day Fixed Bed Gasifier," Korean J. Chem. Eng., 23, 576-580(2006) https://doi.org/10.1007/BF02706797
  2. Lee, S. H., Eom, M. S., Yoo, K. S., Kim, N. C., Jeon, J. K., Park, Y. K., Song, B. H. and Lee, S. H., "The Yields and Composition of Bio-oil Produced from Quercus Acutissima in a Bubbling Fluidized Bed Pyrolyzer," J. Anal. Appl. Pyrolysis., 83, 110-114(2008) https://doi.org/10.1016/j.jaap.2008.06.006
  3. Zhu, W., Song, W. and Lin, W., "Catalytic Gasification of Char from Co-pyrolysis of Coal and Biomass", Fuel Process. Technol., 89(9), 890-896(2008) https://doi.org/10.1016/j.fuproc.2008.03.001
  4. Ginzburg, B. Z., 'Liquid Fuel (oil) from Halophilic Algae: A Renewable Source of Non-polluting Energy,' Renewable Energy, 3(2-3), 249-252(1993) https://doi.org/10.1016/0960-1481(93)90031-B
  5. Minowa, T., Yokoyama, S. Y., Kishimoto, M. and Okakurat, T., "Oil Production from Algal Cells of Dgaaliella Tertiolecta by Direct Thermochemical Liquefaction," Fuel, 74(12), 1735-1738(1995) https://doi.org/10.1016/0016-2361(95)80001-X
  6. Park, J. I., Woo, H. C. and Lee, J. W., 'Production of Bio-energy from Marine Algae: Status and Perspectives,' Korean Chem. Eng. Res., 46(5), 833-844(2008)
  7. Amin, S., "Review on Biofuel Oil and Gas Production Processes from Microalgae", Energy Convers. Manage., 50(7), 1834-1840(2009) https://doi.org/10.1016/j.enconman.2009.03.001
  8. Kloareg, B. and Quatrano, R. S., 'Structure of the Cell Walls of Marine Algae and Ecophysical Functions of the Matrix Polysaccharides,' Oceanogr. Mar. Biol. Ann. Rev., 26, 259-315(1988)
  9. Murakami, T., Xu, G., Suda, T., Matsuzawa, Y., Tani, H. and Fujimori, T., "Some Process Fundamentals of Biomass Gasification in Dual Fluidized Bed," Fuel, 86(1-2), 244-255(2007) https://doi.org/10.1016/j.fuel.2006.05.025
  10. Kwon, T. W., Kim, S. D. and Fung, D. P. C., "Reaction Kinetics of Char-CO2 Gasification," Fuel, 67(4), 530-535(1988) https://doi.org/10.1016/0016-2361(88)90350-X
  11. Peng, W., Wu, Q., Tu, P. and Zhao, N., 'Pyrolytic Characteristics of Microalgae as Renewable Energy Source Determined by Thermogravimetric Analysis,' Bioresour. Technol., 80(1), 1-7(2001) https://doi.org/10.1016/S0960-8524(01)00072-4
  12. Sun, H., Song, B. H., Jang, Y. W., Kim, S. D., Li, H. and Chang, J., "The Characteristics of Steam Gasification of Biomass and Waste Filter Carbon", Korean J. Chem. Eng., 24(2), 341-346(2007) https://doi.org/10.1007/s11814-007-5061-9
  13. NamKung, W., Roh, S. A., Guy, C. and Kim, S. D., 'Kinetics and Combustion Characteristics of Deinking Sludge in a Thermobalance and an Internally Circulating Fluidized Bed,' Can. J. Chem. Eng., 82(5), 939-947(2004) https://doi.org/10.1002/cjce.5450820509
  14. Roh, S. A., Son, S. R., Kim, S. D., Lee, W. J., Lee, Y. K., 'Steam Gasification Characteristics of Pine-nut Shell in a Thermobalance and a Fluidized Bed Reactor,' Key Engineering Materials, 276-279(I), 637-643(2005) https://doi.org/10.4028/www.scientific.net/KEM.277-279.637