To study the effect of ultra-fine water mist containing potassium oxalate on the effectiveness of suppressing methane explosion

a self-made semi-confined chamber was used for explosion suppression experiments to study the effect of changes in potassium oxalate concentration on the particle size of ultra-fine water mist and the performance of methane explosion suppression. The effects of explosion performance were analyzed. The parameters of flame propagation speed

explosion overpressure

average pressure increase rate and explosion power index were analyzed under different concentrations of potassium oxalate. The experimental results show that the addition of potassium oxalate has little effect on the particle size characteristics of ultra-fine water mist. Under the same spraying time

2% potassium oxalate concentration shows the most significant explosion suppression performance for the 9.5% volume fraction of methane. Compared with the no spraying condition

the flame propagation velocity

maximum explosion overpressure

average pressure rise rate

and explosion power index decreased by 57.1%

66.3%

77.9%

and 91.5%

respectively; compared with pure water ultra-fine water mist suppressing the explosion

those parameters decreased by 43.1%

61.3%

75.3%

and 90.5%

respectively. The lower pyrolysis temperature of potassium oxalate can enhance the physical inserting of ultra-fine water mist and block the chemical chain reaction to suppress the explosion of methane effectively.