Comparative study on pyrolysis and gasification within CO2 atmosphere of typical forestry biomass in Northeast Asia: Thermal behavior and kinetic analysis. (15th September 2022) - Wang, Bo
Highlights: The pyrolysis behavior of typical forestry biomass in Northeast Asia is close. The char gasification reactivity of Salicaceae is better than that of Pinaceae. The gasification activation energy for samples is between 154.18 and 187.66 kJ/mol. Abstract: The present study provides a comprehensive comparative investigation on feedstock pyrolysis and char gasification performance of typical forestry biomass obtained from Northeast Asia. Firstly, the physicochemical properties were tested and compared in detail. Then, the pyrolysis experiments were carried out on a thermogravimetric analyzer (TGA), which indicated that different forestry biomass has close thermal decomposition characteristics. The initial thermal degradation temperature of different forest biomass varied in 246.18–316.34 °C, and the temperature of maximum reaction rate was between 366.14 °C and 386.70 °C. The slight discrepancy stemmed from the difference in the ash composition and chemical composition. Next, the isothermal char gasification experiment in the CO2 atmosphere was also conducted at TGA, which can be found that all char were completely gasified within 25 min when the temperature exceeded 950 °C. The gasification results showed that the reactivity of Salicaceae char is better than that of Pinaceae char because of high AAEMs content and alkali index. After that, the reaction apparent activation energy ( Ea ) was calculated by the isoconversional method, the average Ea value for different forestry biomass was between 154.18 and 187.66 kJ/mol. In addition, the Ea at different conversion rates and the average value of Salicaceae char is lower than that of Pinaceae char. Through comparison, it is found that the pyrolysis and char gasification performance of Salicaceae is better than that of Pinaceae since its relatively high AAEMs content and different chemical composition.