OXYGEN INFLUENCE ON ESTONIAN KUKERSITE OIL SHALE DEVOLATILIZATION AND CHAR COMBUSTION

LAURI LOO ； BIRGIT MAATEN ； DMITRI NESHUMAYEV ； ALAR KONIST

《Oil Shale》 34卷3期 (2017/09) Pp. 219-231

https://doi.org/10.3176/oil.2017.3.02

摘要

This work investigated the kinetic parameters of the thermal decomposition of Estonian kukersite oil shale (OS) organic part in air atmospheres at various oxygen-nitrogen ratios. During oil shale combustion, two combustion phases were recognized but could not be separated. Thermo-gravimetric analysis (TGA) of oil shale combustion was conducted in nitrogen-based gases at different oxygen concentrations (5-50% O_2) and heating rates (1, 10, 30 and 50 K/min). The authors modeled oil shale devolatilization and char combustion at different oxygen concentrations by using a discrete activation energy model. The process could be described by four parallel independent reactions. The activation energies were 105- 134 kJ/mol. The combustion rate was found to be dependent on oxygen partial pressure. The power variables of the oxygen concentration for the reaction models were optimized and compared against a unity base case. Using these data, oil shale devolatilization and char combustion in nitrogen-based environments were modeled.

關鍵字

oil shale devolatilization ； thermogravimetric analysis ； oxygen influence ； kukersite kerogen ； combustion kinetics ； parallel reaction model