화학공학소재연구정보센터
Thermochimica Acta, Vol.662, 41-46, 2018
Thermal decomposition mechanisms of coal and coal chars under CO2 atmosphere using a distributed activation energy model
The thermal decomposition characteristics of Sanxing (SX) coal and coal chars (C500 and C850, produced at 500 and 850 degrees C, respectively) were tested by nonisothermal thennogravimetric analysis and a distributed activation energy model used to determine the kinetic parameters. The effects of char-making temperature were investigated. A sharp peak was seen in the relationship between X and activation energy (E) of the SX and C500 samples; no evident peak, but a ladder-shaped decline, was shown by C850. The temperatures at which E was maximized were relatively close for SX coal and C500, while the minimum value of activation energy was almost the same for the three samples. This showed the char-making process had less influence on the gasification reaction under high-temperature conditions. The results of the kinetic compensation effect between E and the pre-exponential factor (k(0)) showed that different kinetic compensation mechanisms occurred for the pyrolysis and gasification-dominated stages.