HYDROGEN AND SYNGAS PRODUCTION VIA PYROLYSIS AND STEAM GASIFICATION OF BAGASSE IN A DUAL BED REACTOR

Morteza Shoja, Ahmad Tavasoli
unpublished
Steam gasification of bagasse followed by thermal cracking of tar was carried out at atmospheric pressure using a dual bed reactor. The first bed was used for the steam gasification and the second bed was used for thermal cracking of tar. Iron fillings were used as the packed bed material in the second bed. The effects of reaction temperature (600 to 900 o C), packed bed height (40-100 mm) and steam/bagasse ratio on the product (char, tar and gas) yield and gas (H 2 , CO, CO 2 , CH 4 , C n H m)
more » ... 2 , CH 4 , C n H m) composition were studied. Over the ranges of the experimental conditions used, the operating conditions were optimized for gasification temperature around 850°C, a steam/bagasse ratio of 0.6 and packed bed height of 100 mm, because a gas richer in hydrogen and carbon monoxide and poorer in carbon dioxide and hydrocarbons. It was observed that the steam gasification of bagasse in a dual bed process increased the gas yield from 0.622 to 0.762 (m 3 /kg) and decreased the tar yield from 0.53 to 0.39 (g/g) compared to single bed process while the heating value of the product gas remained almost constant (10-11MJ/m 3). H 2 and CO yields increased to 18.02 and 49.3 vol.%, respectively and CO 2 yields shifted down to 27.06 vol.%. Methane and heavier hydrocarbon gases yields decreased to 5.34 and 0.262 vol.%. These variations are attributed to reforming of tar compounds with steam and/or CO 2 and water gas shift reactions.
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