Experimental study of NaHCO3 spray assisted ferro-nickel foam quenching

• NaHCO 3 powder's impact on flame-quenching of ferro-nickel foam was studied. • NaHCO 3 powder can eliminate the flame oscillations caused by ferro-nickel foam. • NaHCO 3 powder can enhance the flame-quenching capability of iron-nickel foam. • NaHCO3 spray reduces peak overpressure, enhanced by greater mass. To extinguish the methane explosion flame, the method of spraying NaHCO 3 powder combined with ferro-nickel foam was adopted. The results indicate that the flame quenching was related to the amount of NaHCO 3 sprayed and the pore density of the ferro-nickel foam. Using ferro-nickel foam with a pore density of less than 30ppi alone cannot extinguish the flame. However, when spraying a certain amount of NaHCO 3 powder, the flame was quenched. Moreover, when using ferro-nickel foam with a higher pore density, a smaller mass of NaHCO 3 powder is required to reach the critical quenching condition. Spraying NaHCO 3 powder eliminated the oscillations caused by the ferro-nickel foam, but the combustion reaction in the pipe was exacerbated by turbulence, and the flame front arrived at the porous material more swiftly with a brighter flame. An increase in the mass of NaHCO 3 powder led to a reduction in explosion overpressure, and the decrease magnitude was positively correlated with the mass of NaHCO 3 powder.