木質バイオマスの迅速熱分解における収率, チャー組成の予測

抄録

A method for predicting the yields of products and the elemental composition of char during pyrolysis of biomass was presented. 10 kinds of biomass feedstocks with a focus on wood biomass were pyrolyzed at various temperatures using a Curie-Point Pyrolyzer attached to a gas chromatograph. At moderate tempera-ture not lower than 485°C, the yields of total volatiles linearly increased with the atomic ratio H/C which was also correlated with the lignin content in feedstock. Furthermore, it was clarified that the average elemental composition of total volatiles produced at these temperatures was equal to that of cellulose and that the tar fraction among volatiles consisted of glucosan or cellobiosan, the molecular weight of which was about 300. By combining these results, we developed a new chart for predicting the elemental composition of char pyrolyzed at moderate temperature only from the elemental analysis of feedstock. The presented method is expected to provide a useful guideline for the decision on pyrolysis condition or subsequent conversion such as gasification and combustion.