Application of thermal analysis techniques to assess proneness of coal to spontaneous heating

Low temperature oxidation and its kinetics of cornstalk chars

“…Because the heat evolution is one of the vital properties related to the self-heating, various thermal analysis methods have been developed to directly measure the heat effect and to derive the kinetics of the low temperature oxidation [18]. Among them differential scanning calorimetry (DSC) [19][20][21][22] and isothermal calorimetry [23][24][25][26] are widely employed.…”

Comparison of the inhibition mechanisms of five types of inhibitors on spontaneous coal combustion

“…Inhibition efficiency ¼ ΔH exo of raw coal-ΔH exo of coal=inhibitor ΔH exo of raw coal (1) The temperature ranges of TG, FTIR, and DSC were set from 20 to 800°C at a heating rate of 15.0°C min −1 . The scanning range of infrared spectroscopy was 650 to 4000 cm −1 , with a resolution of 4.0 cm −1 based on the structure of the coal.…”

“…[1][2][3] The main cause of spontaneous coal combustion is oxygen contact with active structures on the surface of coal. However, the proliferation of mined-out areas as a result of this rapid development has increased the risk of spontaneous combustion.…”

Synchronous thermal analyses and kinetic studies on a caged-wrapping and sustained-release type of composite inhibitor retarding the spontaneous combustion of low-rank coal

“…Parameters such as the adiabatic oxidation rate [15], the oxygen consumption combined with the crossing point temperature [16], the greenhouse gases emission concentration [17] in industrial tests and variations of in-situ series FT-IR [14] in laboratory tests were utilized. In particular, synchronous thermal analyses, basing on the simultaneous TGA-DSC measurements of sample, can provide an interrelated mass/heat flow/temperature history of the reaction progress [18], which have been widely used to characterize the reactivity and compositional characteristics of coal, as well as assess the inhibition properties towards the tendency of coal to spontaneous combustion [19]. Avila's research group [20] proposed a reliable criterion for identifying coals prone to self-ignition with two defined parameters, i.e., the mass increase of oxygen adsorption and the spontaneous ignition index relying on TGA/DTG data collected from 27 typical coals.…”