Synthesis and characteristic analysis of coal dust explosion suppressant based on surface modification of ammonium dihydrogen phosphate with methyl hydrogen-containing silicone oil

Abstract

Coal dust explosion is easy to happen in the process of coal pulverization. In order to reduce the risk of coal dust explosion and promote the safety of coal chemical industry, surface modification of the ammonium dihydrogen phosphate (ADP) explosion suppressant was performed with methyl hydrogen-containing silicone oil to obtain modified ammonium dihydrogen phosphate (MADP) powder. The explosion suppression and hydrophobic properties of MADP were tested. The experimental results show that after surface modification, MADP overcomes the defect that the traditional ammonium dihydrogen phosphate explosion suppressant is easily affected by moisture, which results in agglomeration; further, MADP has little or no solubility in water and has excellent hydrophobic properties. After surface modification, MADP has better thermal stability and can withstand higher ambient temperatures. MADP can significantly increase the minimum ignition energy, thus reducing the possibility of combustion and explosion. With the increase in the mass concentration of the explosion suppressant, the maximum explosion pressure gradually decreases and delays. Compared with ADP, MADP has better explosion suppression characteristics and can quickly and efficiently suppress explosion.