Experimental study on the effectiveness of inhibitors affected by high-temperature coal bodies

The efficacy of inhibitors differs significantly between laboratory and field applications, primarily due to neglecting the impact of high-temperature coal on inhibition performance. This study evaluated CaCl 2 , EDTMPA, and TBHQ on coal samples heated at 30°C, 60°C, and 90°C using programmed temperature ramping, Electron Paramagnetic Resonance (EPR), Fourier Transform Infrared (FTIR) spectroscopy, and thermogravimetric analysis. Results show that both CaCl 2 and EDTMPA exhibit enhanced inhibition at higher temperatures. Specifically, CO content for 90-CaCl 2 and 90-EDTMPA was 8.68% and 14.96% of that in untreated coal at 30°C, with oxygen consumption rates of 12.78% and 13.16%, respectively. Functional group reductions were also observed. TBHQ showed optimal performance at 60°C, with ignition points for 90-CaCl 2 , 90-EDTMPA, and 60-TBHQ delayed by 54.76°C, 19.69°C, and 12.33°C, respectively, compared to untreated coal at 30°C. These findings suggest selecting inhibitors based on coal body temperature can enhance fire prevention efficiency in mines, optimizing inhibitor use and improving mine safety.