Abstract
This experiment aimed at the synergy effect of ripple flame arrester and water mist on hydrogen doped methane explosions. By comparing the dynamic flame resistance process and changes in explosion parameters, the mechanism of synergy inhibition was clarified. Result explains that both synergies enhanced the protection efficiency of gas explosions. Spray conditions could greatly affect the propagation velocity of flames entering narrow channels, thus affecting its stagnation time inside the ripple hole and quenching probability. The synergy was attributed to the combined action of mist parameters on weakening and enhancing effects. As the nozzle type enlarged, the increase in mist parameter promoted a decrease in pressures at both ends, even the complete inhibition was achieved.
Inhibition effect was gradually enhanced as the spray time prolonged, and explosion-resistance parameters were also greatly decreased. But the inhibition result showed a variation process of “failure-success-failure” as the spray pressure enlarged, and explosion-resistance parameters also displayed a change of first reducing and then rising.
Under the synergy effect, the inhibition could be achieved as the generation rate of free radicals was lower than the destruction rate and flame temperature at the ripple hole outlet was lower than the critical flame resistance temperature.
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