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Pilot scale autothermal gasification of coconut shell with CO2-O2 mixture

Frontiers in Energy 2015年第3期9卷 362-370页

作者： Bayu PRABOWO Herri SUSANTO Kentaro UMEKI Mi YAN Kunio YOSHIKAWA Department of Environmental Science and Technology Tokyo Institute of Technology Yokohama 226-8503 Japan Institute of Energy and Power Engineering Zhejiang University of Technology Hangzhou 310014 China Department of Chemical Engineering Institut Teknologi Bandung Bandung 40132 Indonesia Division of Energy Science Lulea University of Technology Lulea 971 87 Sweden Institute of Energy and Power Engineering Zhejiang University of Technology Hangzhou 310014 China Department of Environmental Science and Technology Tokyo Institute of Technology Yokohama 226-8503 Japan

This paper explored the feasibility and benefit of CO2 utilization as gasifying agent in the autothermal gasification process. The effects of CO2 injection on reaction temperature and producer gas composition were examined in a pilot scale downdraft gasifier by varying the CO2/C ratio from 0.6 to 1.6. O2 was injected at an equivalence ratio of approximately 0.33-0.38 for supply- ing heat through partial combustion. The results were also compared with those of air gasification. In general, the increase in CO2 injection resulted in the shift of combustion zone to the downstream of the gasifier. However, compared with that of air gasification, the long and distributed high temperature zones were obtained in CO2-O2 gasification with a CO2/C ratio of 0.6-1.2. The progress of the expected CO2 to CO conversion can be implied from the relatively insignificant decrease in CO fraction as the CO2/C ratio increased. The producer gas heating value of CO2-O2 gasification was consistently higher than that of air gasification. These results show the potential of CO2-O2 gasification for producing high qualityproducer gas in an efficient manner, and the necessity for more work to deeply imply the observation.

关键词： keywords biomass gasification CO2 downdrafl gasifier,autothermal

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