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In this paper, the TGA-DSC curve of coal powder explosion inhibitors was analyzed. At the same time, the influence of the explosion inhibitor type and mass fraction on the five explosion intensity parameters of pulverized coal  P ex ,(dp/dt) ex ,K st ,t 1, and  t 2was explored. The results show that CaCl 2  and NH 4 H 2 PO 4  go through three main stages: dehydration stage, decomposition stage and crystal transformation stage after high-temperature heating. Calcium chloride absorbs heat through the process of water volatilization and crystal transformation to prevent the combustion of pulverized coal. Meanwhile, NH 4 H 2 PO 4  absorbs heat through decomposition, evaporation and sublimation reactions to prevent the combustion of pulverized coal. For these two explosion inhibitors, the explosion intensity of pulverized coal decreases with the increase of mass fraction. The increase of Al(OH) 3  mass fraction basically does not enhance its explosion suppression effect. After adding NH 4 H 2 PO 4 , the maximum decrease of  P exwas 32.08%, which was 11.89% and 16.99% higher compared to the addition of CaCl 2  and Al(OH) 3 , respectively. The maximum decrease of  (dp/dt) exwas 98.47%, which was 29.45% and 33.38% higher compared to the addition of CaCl 2  and Al(OH) 3 , respectively. Therefore, the order of explosion suppression performance was determined as: NH 4 H 2 PO 4  &gt; CaCl 2  &gt; Al(OH) 3.

Effect of CaCl 2 , Al(OH) 3 and NH 4 H 2 PO 4 and their dosages on the explosion intensity of pulverized coal