Study of the effect of nickel foam synergistic CO2 on low hydrogen ratio methane explosion.

To improve the explosion suppression efficiency of porous media in natural gas hydrogen-doped pipelines, this paper designs and builds an experimental platform with dimensions of 10 cm × 10 cm × 100 cm organ transparent glass explosion pipeline and researches the synergistic effect of the use of nickel foam and CO₂ to inhibit the explosion of hydrogen-doped methane with a hydrogen doping ratio of φ = 10%. Studies have shown that using a dual explosion suppression mechanism, the synergistic effect of nickel foam and CO₂ acting at different jet positions has a significant inhibitory effect on the flame and overpressure of low-hydrogen-ratio methane explosions. The synergistic CO₂ in porous media has a more potent inhibitory effect on the right-side wall jet than on the left-side and left-side jet. When the synergistic impact of nickel foam and CO₂ acts on the right-side wall jet, the flame is quenched, substantially attenuating the overpressure peak. When the nickel foam synergistic CO₂ acts on the right-side wall jet, the optimal effect is achieved when the CO₂ jet pressure is set at 0.3 MPa, which successfully quenches the flame and significantly reduces the overpressure peak. However, the dual explosion suppression mechanism fails when the CO₂ jet pressure is 0.2 MPa. [ABSTRACT FROM AUTHOR]