Pilot scale autothermal gasification of coconut shell with CO<sub>2</sub>-O<sub>2</sub> mixture

doi:10.1007/s11708-015-0375-5

Front. Energy

2015, Vol. 9

Issue (3) : 362-370 https://doi.org/10.1007/s11708-015-0375-5

RESEARCH ARTICLE

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

Bayu PRABOWO¹,Herri SUSANTO²,Kentaro UMEKI³,Mi YAN^4,^*(

),Kunio YOSHIKAWA⁵

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

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Abstract

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 supplying 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 quality producer gas in an efficient manner, and the necessity for more work to deeply imply the observation.

Keywords biomass gasification CO₂ downdraft gasifier autothermal

Corresponding Author(s): Mi YAN

Online First Date: 26 August 2015 Issue Date: 11 September 2015

Cite this article:

Bayu PRABOWO,Herri SUSANTO,Kentaro UMEKI, et al. Pilot scale autothermal gasification of coconut shell with CO₂-O₂ mixture[J]. Front. Energy, 2015, 9(3): 362-370.

URL:

https://academic.hep.com.cn/fie/EN/10.1007/s11708-015-0375-5
https://academic.hep.com.cn/fie/EN/Y2015/V9/I3/362

Tab.1 Proximate and ultimate analysis of coconut shell

Fig.1 Gasification system

Fig.2 Detail of gasifier (cm)

Fig.3 Temperature evolution during experimental run

Fig.4 Producer gas evolution during experimental runs

Tab.2 Experimental conditions and gas measurement results

Fig.5 Temperature profile at the measurement zone of 0, 150 and 300 mm from the inlet of gasifying agent

Fig.6 Effect of CO₂/C ratio on producer gas composition

Fig.7 Effect of CO₂/C ratio on combustible gas yield

Fig.8 Effect of CO₂/C ratio on producer gas LHV and H₂/CO ratio

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