Thermal characterisation of microalgae under slow pyrolysis conditions |
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| Affiliation: | 1. Graduate School of the Environment, Macquarie University, North Ryde, NSW 2109, Australia;2. The Crucible Group Pty Ltd., PO Box 183, Mayfield, NSW 2304, Australia;1. Center for Biorefining and Department of Bioproducts and Biosystems Engineering, University of Minnesota, 1390 Eckles Ave., St. Paul, MN 55108, United States;2. GIMSCOP and Department of Chemical Engineering, Federal University of Rio Grande do Sul, Rua Engenheiro Luiz Englert, Prédio 12204, 90040-040, Porto Alegre-RS, Brazil;1. Graduate Institute of Bioresources, National Pingtung University of Science and Technology, Pingtung 91201, Taiwan;2. Department of Environmental Science and Engineering, National Pingtung University of Science and Technology, Pingtung 91201, Taiwan;1. Global Technology, SK innovation, 325 Exporo, Yuseong-gu, Daejeon 305-712, Republic of Korea;2. Department of Chemical Engineering, Sungkyunkwan University, 300 Chunchun, Jangan, Suwon 440-746, Republic of Korea;1. Department of Chemical Engineering, Kangwon National University, 346 Joongang-ro, Samcheok, Gangwon-do 363-883, Republic of Korea;2. Department of Chemical Engineering, Kyung Hee University, 1732 Deogyeong-daero, Giheung-gu, Yongin-si, Gyeonggi-do 446-701, Republic of Korea;3. Department of Chemical Engineering, Pukyong National University, 365 Sinseon-ro, Nam-gu, Busan 608-739, Republic of Korea |
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| Abstract: | Aquatic microalgae have high potential for production of bio-chemicals, liquid transport fuels and charcoal. Their main advantage over existing energy crops is that they have faster growth rates and do not compete with food production. In this study six species of microalgae (Tetraselmis chui, Chlorella like, Chlorella vulgaris, Chaetocerous muelleri, Dunaliella tertiolecta and Synechococcus) were selected, presenting a broad cross-section of physical characteristics and known behaviour under cultivation. The objective of this work was to ascertain differences in thermal conversion behaviour between the microalgae species under slow pyrolysis conditions.The samples were first analysed with a Computer Aided Thermal Analysis (CATA) technique at a standard heating rate of 10 °C/min. For all species, the energy required to achieve thermal conversion was found to be approximately 1 MJ/kg. Gas chromatography was then applied to measure the evolution of biogas compounds with temperature. The heat of combustion of the biogas compounds was estimated to vary significantly between species, ranging from 1.2 to 4.8 MJ/kg.Pyrolysis oil product yields were also estimated at 500 °C. The oils produced at this temperature were collected and their molecular weight distribution assessed by Matrix Assisted Laser Desorption/Ionisation (MALDI). The species were found to produce up to 43% by volume of bio-oils. In all samples the char fraction remained above one third of total sample weight. |
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