Experimental study on the effect of ammoniumdihydrogen phosphate on the flame structure of methane explosion based on detonation suppression
XU Jingde
LI Ruide
ZHANG Yanwei
Abstract：The aim of this study is to investigate the intuitive effect of ammonium dihydrogen phosphate on the flame propagation and structure of methane/air explosion.Based on the principles of energy conservation and chemical kinetics,methane explosion suppression tests are carried out in a 60L fixed-capacity incendiary bomb,and images of the explosion flame propagation are obtained and analysed by using texture-imaging technology.The test results show that ammonium dihydrogen phosphate has an attenuating effect on the explo-sion flame,and with the increase of its concentration,the flame propagation speed decreases significantly,the flame radius is reduced,and the effect is more obvious when it is close to the optimal methane gas explosion concentration.Among them,150g/m3 ammonium dihydrogen phosphate inhibited the methane explosion at 9.5%and 8.0%concentrations,reflecting the high efficiency.In addition,ammonium dihydrogen phosphate prolonged the reaction time of methane explosion,which is manifested by a significant increase in the autofluo-rescence time in the flow field.From the thermodynamic point of view,the decomposition of ammonium di-hydrogen phosphate heat-absorbing effect reduces the flame temperature,not only slowing down the flame propagation speed,but also leading to the flame boundaries show flaky and thinning characteristics.This phe-nomenon is particularly prominent at a methane concentration of 11 percent,further confirming the potential efficacy of ammonium dihydrogen phosphate as a detonation suppression additive.
Keywords：safety engineeringmethane explosionammonium dihydrogen phosphatestriationsuppression mechanism
Publication Date：2024-04-28
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：10( 90-99 )