Abstract: Four groups of TGA experiments (on raw coal,coal with ammonium bicarbonate,coal with ammonium polyphosphate,coal with PA respectively) were designed and carried out to study inhibiting properties of three inhibitors. Dynamic analysis method was used to examine effects of the inhibitors on activation energies for the samples in three combustion stages. The results show that three kinds of inhibitors have no effects on the normal combustion of coking coal and possess good inhibiting results,that activation energies of oxidation stage are increased to 78.92 kJ/mol in raw coal group, 81.63 kJ/mol in ammonium bicarbonate group, 94.22 kJ/mol in ammonium polyphosphate group and 80.55 kJ/mol in PA group,that ammonium polyphosphate possesses the best inhibiting effect (the activation energy of the sample increases most significantly),that PA can promote coal's complete combustion and efficient utilization (the sample has the lowest activation energy in combustion weight loss stage),and that both ammonium polyphosphate and PA can inhibit coal spontaneous combustion efficiently, they can be used as the optimal inhibitors in actual production.

Key words: coking coal, polyacrylate(PA), thermogravimetric analysis (TGA), dynamic analysis, activation energy, inhibitor optimization