抄録
This paper reports on the pyrolysis and gasification behavior of biomass and the relationship between biomass-char property and gasification rate. The effect of pyrolysis conditions on the product yield has been studied, and the gasification kinetics of biomass-char has been revealed by measuring the rate of weight loss during reaction with CO_2, as a function of temperature. First-order kinetic rate constants are determined by fitting the weight loss data using a random pore model. The relationship between char structure and CO_2 gasification reactivity and pyrolysis product were investigated in the range of 15 to 600℃/min (heating rate) at 0.1Mpa, and 0.1 to 3Mpa (pyrolysis pressure) at 15℃/min. The experimental results indicate that the yields of total volatile matter decrease as pressure increases and the reactivity of the biomass-char is determined by pyrolysis condition. The CO_2 gasification rates in char generated at 0.1MPa exhibited approximately twice values compared to those at 3MPa. This is because the uniformity of carbonaceous structure rises with increasing pyrolysis pressure. The uniformity of carbonaceous structure would affect CO_2 gasification reactivity.
