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This study explores the effective combination of nitrogen injection and lateral venting in a horizontal pipe to limit flame propagation and, thus, lessen damage from gas explosion. Two nitrogen nozzles were placed downstream of the vents, and the lateral vent was mounted on the upper surface of the pipe for the experiment. According to the results, lateral venting can significantly slow flame propagation speed. The flame propagation speed was lowered from 4.8 m/s to 0.5 m/s, a reduction of 89.5%, giving enough time for the creation of the N 2  flame arresting zone. When the nitrogen pressure reaches or surpasses 0.3 MPa, the nitrogen injection can stop the flame from moving farther downstream of the pressure release port. The study discovered that for horizontal pipes, the synergistic effect of lateral venting and inert gas injection is more effective at preventing methane-air explosions than either mitigation method alone (i.e. ventilation alone or inert gas injection alone). The study’s findings may offer theoretical support for the prevention and control of flame spread during gas explosions in mines.

Methane flame propagation characteristics in pipelines based on the synergistic effect of lateral venting and N 2 injection