Pyrolysis and Carbon Dioxide Gasification Kinetics of Pine Cones and Lignite Blends

This study determines the kinetic parameters of blended Pinus kesiya, Pinus elliottii, and Indonesian lignite in co-pyrolysis and co-gasification. Nine binary blends and three ternary blends were tested using a thermogravimetric analyzer. Pyrolysis was carried out in an argon atmosphere and DTG plots showed that Pinus kesiya had the highest maximum pyrolysis rate while Pinus elliottii had the lowest starting decomposition temperature. Similarly, blends with Pinus elliottii had lower maximum pyrolysis rates and lower starting decomposition temperatures than those with Pinus kesiya. Ternary blends, however, have starting decomposition temperatures and maximum pyrolysis rates close to those of pure Pinus elliottii. The Kissinger-Akahira-Sunose (KAS) model was used to obtain the reaction rate constants and activation energies of the pyrolysis reactions of various blends. Co-gasification of the mixtures was also done in a CO2 environment at gasification temperatures of 700 degrees C, 800 degrees C, and 900 degrees C. The conversion-time data obtained were fitted using five different gas-solid reaction models.