Characteristics of Thermal Decomposition of Biomass and Numerical Simulation for the Gasification of Decomposed Mixture

As a first step to clarify the mechanisms of the combustion and gasification of biomass, fundamental experiment for the thermal decomposition and numerical simulation for the elementary reaction of decomposed chemical species have been performed. In the experiment, various kinds of biomass particle were immediately heated by applying the electrically induced magnetic field to the metal tray on which the objective particles were placed. It was clarified that for the two levels of decomposition temperature 590 and 1 040 deg C, the variations of decomposition rate with heating time was same with each other, but the components of decomposed species were largely different ; the mole fraction of C 6-C 9 components for the low temperature 590 deg C were 3-10 times larger than those for 1 040 deg C. Furthermore, the relationship between percentage of C 5, C 6-C 9 species and lignin containing in biomass was ascertained. It was obtained from the numerical simulation that these heavy species could decompose to C 1 and H2 at 1 000 deg C over with H2O acting as the oxidation agent, and that the effect of H2O in the atmospheric pressure became maximum at Ptigr-0.7 atm.