Abstract
Pyrolysis is considered as an effective thermal decomposition process for the utilization of solid fuels. Moreover, co-pyrolysis of coal and biomass offers the possibility to increase the process efficiency and to reduce the economic and environmental disadvantages of mono-utilization. Thermogravimetric analysis (TGA) provides a feasible way to obtain valuable thermal and kinetic data on the co-pyrolysis process. Kinetic analysis is critical for sizing, design, yield control, and optimization of thermochemical processes such as pyrolysis. In this study, the kinetic characterization was evaluated using the TGA data of Imbat coal, rice straw and their blends at heating rates of 5, 10 and 20 °C/min. The activation energy (Ea) and pre-exponential factor (A) were determined by Doyle's method (model fitting) and the multistep analysis based on a new pyrolysis model for the co-pyrolysis of Imbat coal and rice straw. The correlation coefficient (R2) results for the pyrolysis model were greater than 0.99, and the thermal behaviors of the pseudocomponents were simulated, and the TG curves were estimated at the additional heating rate (40°C/min). In addition, a new Instantaneous Pyrolysis Index (IPI) was introduced in this study. The IPI value provided important information about the severity of pyrolysis at different temperature ranges.
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