BTLにおけるバイオマスガス化炉モデリング(<特集>反応モデリング-石炭・重質油・バイオマス-)

概要

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Biomass Technology Research Center of AIST Chugoku has developed the biomass-to-liquid (BTL) process. At first the basic BTL process was simulated, which consisted of woody biomass gasification with steam, wet gas cleaning, gas compression, Fischer-Tropsch (FT) synthesis reaction, hydrocracking, and distillation at 100t/d of collected woody biomass. The simulation results suggested that syngas production in a gasification method with a lower steam to carbon ratio ([H_2O]/[C]) was desirable for decreasing gas compression power and input energy. On a laboratory scale the effect of [H_2O]/[C] and O_2 content on CO_2/O_2 gasification behavior was investigated using a downdraft fixed-bed gasifier, which was one of the options for a gasification method which accomplished the requirements obtained by the system simulation. With increasing O_2 content up to 50vol%, the conversion to gas on a carbon basis and the contents of CO and H_2 were increased up to 89 C-mol%, 42.2vol%, 20.3vol%, respectively. This gasification method was applied to the BTL bench plant operation. In CO_2/O_2/N_2=18/63/19 (vol%) gasification the downdraft fixed-bed gasifier was steadily operated for 7h. The conversion to gas and the contents of CO and H_2 were obtained to 90.1 C-mol%, 40.5vol%, 28.0vol%, respectively.
2011-02-20