3-3-3 水生バイオマスガス化による合成ガス(CO+H_2)製造と窒素・硫黄化合物の排出挙動把握(3-03 ガス化2,Session 3 バイオマス等)

概要

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The Syngas (CO+H_2) production and emission behavior of sulfur and nitrogen compounds were investigated using a down-draft fixed bed gasifier at 1173 K in He/CO_2/O_2 gasification of an aquatic biomass such as gulfweed, which grows faster than woody biomass. The conversions to gas on a carbon basis in the gasification with CO_2/O_2=79/21 (96.9 C-mol%) was higher compared to that with He/O2=79/21 (93.1 C-mol%). The high ash content (11.8 wt%) would promote partial oxidation and Bourdard reaction (C+CO_2→2CO). The nitrogen in the feedstock was converted to N_2 and NH_3. The yields of N_2 and NH_3 were 79.3 and 11.0 N-mol% in the gasification with CO_2/O2=79/21, while those were 63.1 and 27.1 N-mol% with He/O2_=79/21. This result suggested that CO_2 as a gasifying agent prevented nitrogen in the aquatic biomass from forming NH3.
2012-07-30