Energetic analysis of gasification of biomass by partial oxidation in supercritical water |
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Authors: | Qingqing Guan Chaohai Wei Xinsheng Chai Ping Ning Senlin Tian Junjie Gu Qiuling Chen Rongrong Miao |
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Affiliation: | 1.Faculty of Environmental Science and Engineering, Kunming University of Science and Technology, Kunming 650500, China;2.The Key Lab of Pollution Control and Ecosystem Restoration in Industry Clusters, College of Environment and Energy, South China University of Technology, Guangzhou 510006, China;3.State Key Laboratory of Pulp and Paper Engineering, South China University of Technology, Guangzhou 510006, China |
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Abstract: | Partial oxidation gasification in supercriticalwater could produce fuel gases (such as H2, COand CH4) and significantly reduce the energy consumption. In this work, an energetic model was developed to analyze the partial oxidative gasification of biomass (glucose and lignin) in supercritical water and the related key factors on which gasification under autothermal condition depended upon. The results indicated that the oxidant equivalent ratio (ER) should be over 0.3 as the concern about energy balance but less than 0.6 as the concern about fuel gas production. Feedstocks such as glucose and lignin also had different energy recovery efficiency. For materials which can be efficiently gasified, the partial oxidation might be a way for energy based on the combustion of fuel gases. Aromatic materials such as lignin and coal are more potential since partial oxidation could produce similar amount of fuel gases as direct gasification and offer additional energy. Energy recovered pays a key role to achieve an autothermal process. Keeping heat exchanger efficiency above 80% and heat transfer coefficient below 15 kJ·s-1 is necessary to maintain the autothermal status. The results also indicated that the biomass loading should be above 15% but under 20% for an autothermal gasification, since the increase of biomass loading could improve the energy supplied but decrease the efficiency of gasification and gaseous yields. In general, some specific conditions exist among different materials. |
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Keywords: | Autothermal Gasification Supercritical water Biomass Energetic model |
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