Journal of Chemical and Pharmaceutical Research (ISSN : 0975-7384)

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Original Articles: 2016 Vol: 8 Issue: 7

Comparative studies on gasification of corn cob, Casuarina wood and coconut shell in a fixed bed gasifier

Abstract

A 6 kWe, fixed bed, downdraft gasifier was used to compare its performance on 3 fuels: corn cob (CC), casuarina wood (CW) and coconut shell (CS). Air was administered above the throat through 4 equally spaced conduits in forced circulation mode. Gas composition, HHV of gas, specific gas generation (SGG) and cold gas efficiency was compared for the fuels by varying Equivalence Ratio (ER). Studies revealed that all fuels were gasified successfully. CO2/CO of gas was observed as least at an ER of 0.3 for CC & CW while for CS it was at 0.35. Maximum HHV of gas from CC gasification (4.58 MJm-3) is lesser compared with CW (4.81 MJm-3), higher when compared with CS (4.23 MJm-3). SGG associated with least CO2/CO was observed as 2.12 m3kg-1, 2.39 m3 kg-1 and 3.05 m3kg-1 for CC, CW and CS respectively. Optimal cold gas efficiency for CC gasification is 62.83%, whereas it is 70.18% and 72.74% for CW and CS gasification respectively. Tar content was least for CS gas and particulates content was maximum for CC gas.