직접 및 간접열교환에 따른 연속식 반응기 내 바이오매스 저속열분해 특성에 대한 실험적 연구
Experimental Study on Slow Pyrolysis of Biomass by Direct and Indirect Contact Heat Transfer in a Continuous Reactor
2
조회
0
다운로드
0
인용
0
참고문헌
키워드
초록
Biochar from pyrolysis is emerging as a new option for biomass utilization for various purposes including soil amelioration and carbon sequestration. This study investigated the slow pyrolysis characteristics of wood pellet in a continuous reactor varying the heat transfer type (direct and indirect contact) at various temperatures (400~700℃) with different carrier gas compositions (inert, O2 2%, and O2 4%). Direct contact heat transfer by preheated carrier gas accelerated the heat up of biomass, promoting the pyrolysis process as well as the temperature increase of indirect contact cases. The presence of O2 in the carrier gas resulted in limited oxidation reactions with pyrolytic vapor, increasing the reactor temperature to 529.4℃ and 591.7℃ at 2% and 4% O2, respectively, compared to the inert case having a final temperature of 492.4℃. This can be exploited to save the external heat supply but a careful temperature control is required to yield uniform biochar properties. The pyrolysis products from different test conditions were characterized for mass yield and detailed properties of biochar, bio-oil, and non-condensable gases.
Abstract
Biochar from pyrolysis is emerging as a new option for biomass utilization for various purposes including soil amelioration and carbon sequestration. This study investigated the slow pyrolysis characteristics of wood pellet in a continuous reactor varying the heat transfer type (direct and indirect contact) at various temperatures (400~700℃) with different carrier gas compositions (inert, O2 2%, and O2 4%). Direct contact heat transfer by preheated carrier gas accelerated the heat up of biomass, promoting the pyrolysis process as well as the temperature increase of indirect contact cases. The presence of O2 in the carrier gas resulted in limited oxidation reactions with pyrolytic vapor, increasing the reactor temperature to 529.4℃ and 591.7℃ at 2% and 4% O2, respectively, compared to the inert case having a final temperature of 492.4℃. This can be exploited to save the external heat supply but a careful temperature control is required to yield uniform biochar properties. The pyrolysis products from different test conditions were characterized for mass yield and detailed properties of biochar, bio-oil, and non-condensable gases.
참고문헌 (15)
- J. Lehmann, "A handful of carbon", Nature, 447, pp.143~144 (2007)
- J. Lehmann, "Biochar for Environmental Management : Science and Technology", pp.13~32 (2009), Earthscan
- G. Fellet, "Application of biochar on mine tailings:effects and perspectives for land reclamation", Chemosphere, 83, pp.1262~1267 (2011)
- K.M. McElligott, "Biochar amendments to forest soils: effects on soil properties and tree growth", M.S., pp.2011
- J.K. Brennan, "Water in porous carbons", Colloids Surf. A, 187, pp.539~568 (2001)
- H.P. Schmidt, "55 Uses of Biochar", Ithaka Journal, 1, pp.286~289 (2012)
- T. Chen, "Characterization of energy carriers obtained from the pyrolysis of white ash, switchgrass and corn stover - Biochar, syngas and bio-oil", Fuel Process. Technol., 142, pp.124~134 (2016)
- J. Park, "Slow pyrolysis of rice straw: Analysis of products properties, carbon and energy yields", Bioresour. Technol., 155, pp.63~70 (2014)
- Y. Lee, "Characteristics of biochar produced from slow pyrolysis of Geodae-Uksae 1", Bioresour. Technol., 130, pp.345~350 (2013)
- Y. Lee, "Comparison of biochar properties from biomass residues produced by slow pyrolysis at 500 ℃", Bioresour. Technol., 148, pp.196~201 (2013)
- M. Kim, "Clean and energy-efficient mass production of biochar by process integration: Evaluation of process concept", Chem. Eng. J, 355, pp.840~849 (2019)
- S.A. Channiwala, "A unified correlation for estimating HHV of solid, liquid and gaseous fuels", Fuel, 81, pp.1051~1063 (2002)
- T. Qu, "Experimental study of biomass pyrolysis based on three major components: hemicellulose, cellulose, and ligin", Ind. Eng. Chem. Res., 50, pp.10424~10433 (2011)
- K. Chouchene, "Thermal degradation of olive solid waste :influence of particle size and oxygen concentration", Resour. Conserv. Recy., 54, pp.271~277 (2010)
- T. Kan, "Lignocellulosic biomass pyrolysis: A review of product properties and effects of pyrolysis parameters", Renew. Sust. Energ. Rev., 57, pp.1126~1140 (2016)