Syngas production by CO₂/O₂ gasification of aquatic biomass
2013
Hanaoka, Toshiaki | Hiasa, Shou | Edashige, Yusuke
In the gasification of an aquatic biomass with He/CO₂/O₂, the effects of the concentration of CO₂ and O₂ in the gasifying agent and the feeding rate on the gasification behavior were investigated using a downdraft fixed-bed gasifier at 900°C. Using CO₂/O₂ as the gasifying agent led to an increase in the conversion to gas and the syngas (CO+H₂) content because the gasification of char with CO₂ (C+CO₂→2CO) and the decomposition of tarry compounds were promoted. Increasing CO₂ content led to the increase in the conversion to gas and CO content and the decrease in the H₂ content. With increasing O2 content, contents of CO and H₂ increased while the conversions to gas remained almost constant. Especially with CO₂/O₂=45/55vol.%, the conversion to gas was 94.0C-mol% and the syngas content exhibited a maximum value of 69.7vol.%. As the feeding rate was decreased, contents of CO and H₂ decreased while the conversion to gas remained almost constant. The nitrogen atoms in the feedstock were mainly converted to form N₂. H₂S and COS were the main sulfurous gases. The sulfur content in the char was much higher than that in the feedstock.
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