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

E-ISSN： 1099-114x|42|3|1158-1171

ISSN： 0363-907X

Source： INTERNATIONAL JOURNAL OF ENERGY RESEARCH, Vol.42, Iss.3, 2018-03, pp. : 1158-1171

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Abstract

SummaryFive inhibitors—Zn/Mg/Al‐CO₃ layered double hydroxides (LDHs), thermosensitive hydrogel (P(NIPA‐co‐SA)), diammonium phosphate ((NH₄)₂HPO₄), sodium phosphate (Na₃PO₄), and magnesium chloride (MgCl₂)—commonly used to forestall the spontaneous combustion of anthracite and coke coal were investigated in this study, and the inhibition effects were quantified. According to the results of thermogravimetry, differential scanning calorimetry, Fourier transform infrared spectroscopy, and kinetic analysis, Zn/Mg/Al‐CO₃‐LDHs, P(NIPA‐co‐SA), and (NH₄)₂HPO₄ all exert substantial inhibiting effects on anthracite and coke coal. Specifically, P(NIPA‐co‐SA) was altered during the liquid‐to‐gel phase, which isolated the oxygen from the coal surface and produced an endothermic reaction that decreased the environmental temperature; this reaction further inhibited spontaneous combustion. Conversely, MgCl₂ promoted a combustion reaction and reduced the apparent activation energy of coal, increasing the risk of spontaneous combustion. This study provides a reference for selecting suitable inhibitors to prevent the spontaneous combustion of coal.