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2015, Volume 9, Issue 3

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Frontiers in Energy >> 2015, Volume 9, Issue 3 doi: 10.1007/s11708-015-0375-5

Pilot scale autothermal gasification of coconut shell with CO

1. 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.2. Department of Chemical Engineering, Institut Teknologi Bandung, Bandung 40132, Indonesia.3. Division of Energy Science, Luleå University of Technology, Luleå 971 87, Sweden.4. Institute of Energy and Power Engineering, Zhejiang University of Technology, Hangzhou 310014, China.5. Department of Environmental Science and Technology, Tokyo Institute of Technology, Yokohama 226-8503, Japan

Accepted: 2015-08-26 Available online: 2015-09-11
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Abstract

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

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