3-2-3 動力学因子分布に基づくバイオマス粒子の迅速熱分解挙動の予測(3-2 熱分解2,Session 3 バイオマス等,研究発表)

抄録

Pyrolysis of pulverized biomass was performed with a thermogravimetric analyzer (TGA) and a wire-mesh reactor (WMR). Mass release characteristics during TGA pyrolysis were analyzed by a multi-component model, and then distributions of kinetic parameters such as an activation energy and a frequency factor were obtained for every biomass sample. It was shown that the distributions of the kinetic parameters were influenced by a condition for the TGA pyrolysis, i.e., the initial sample mass, in other words, the initial height of the sample bed formed in a sample cup. Increasing initial mass resulted in less extensive mass release, and this was mainly due to chemical interaction between the nascent volatiles and the pyrolyzing solid within the bed. Among the sample used, a pine sawdust underwent such chemical interaction minimally, and therefore the distributions of the kinetic parameters was little affected by the initial sample mass. It was, moreover, found that the model predicted the mass release characteristics during the pyrolysis of the sawdust in WMR over a range of heating rate from 1 to 1,000 K/s. On the other hand, the model prediction for the WMR pyrolysis of a coffee residue was not successful, because the chemical interaction as mentioned above was eliminated in WMR.