Thermal behavior and kinetics of the pyrolysis of the coal used in the COREX process

Study of the pyrolysis kinetics of Datong coal using a sectioning method

“…The semi-coke is coked further in this temperature range. The observed activation energies, particularly in the low-and high-temperature ranges, are lower than that obtained by Zhang (2013), with a value between 100 kJ/mol and 200 kJ/mol determined by the Coasts-Redfern method. The reason is that the experimental data should not have been calculated by G( ) for the entire process, which leads to the error being introduced in the Coasts-Redfern method.…”

“…Regardless of the heating rate employed, the main pyrolysis process of DT coal was roughly divided in two stages by Zhang (2013): the primary pyrolysis temperature range was from 300°C to 600°C; the secondary pyrolysis occurred at temperature from 600°C to 800°C. In this paper because changes of the kinetic mechanism are often accompanied by radical changes in the mass loss rate, the temperature range is divided into three parts at the temperature where the regional variation of mass loss rate reaches the maximum.…”

“…In the Coasts-Redfern method, commonly used mechanism functions are inserted into the non-isothermal kinetic equation to fit the experimental data one-byone. The mechanism function with the largest correlation coefficient is selected as the best (Zhang et al, 2013). In this process, the reaction order is often replaced by the apparent reaction order to obtain the best fit .…”

High ash coal pyrolysis at different heating rates to analyze its char structure, kinetics and evolved species

“…Several researchers [10][11][12][13][14][15] and recently authors [16][17][18][19][20] have reported that thermal analysis techniques such as thermogravimetric analysis and mass spectrometry (TGA-MS) have been widely used to estimate the rapid quantitative methods for the examination of processes under isothermal or non-isothermal conditions and allow for the estimation of effective kinetic parameters for various decomposition reactions and evolved gas analyzes, respectively. Due to its complexity of structure and the heterogeneity of components, the determination of the coal pyrolysis process is very difficult, which consists of a lot of physical changes and chemical reactions.…”

Spectroscopic Elucidation of the Links between Char Morphology and Chemical Structure of Coals of Different Ranks

“…Increased volatile matter release creates fine pores [13], thus increasing the micropore porosity [14] and surface area [15]. All the changes indicate increased graphitization which can be expected to affect the intrinsic reactivity.…”