Abstract: In order to study the effect of explosion venting door on gas explosion characteristics, explosion experimental system for large diameter gas pipeline was constructed, and the gas explosion tests were carried out under two conditions with and without explosion venting door. The gas explosion characteristic parameters were measured by high speed data acquisition system and industrial personal computer, and the change laws of characteristic parameters and explosion venting effects were analyzed. The results show that under the condition of gas concentration 9.5%, although the maximum pressure of explosion venting door condition is 1.65 times of that under the condition of empty pipe, the time of pressure reaching steady state is reduced, that when the explosion shock wave propagates from the measuring point 1 to point 3, explosion pressure decay rate of explosion venting door condition is 62.5%, while that is only 14.3% under the condition of empty pipe, that the venting door can significantly attenuate explosion pressure, that the attenuation of temperature has nothing to do with explosion venting door, and that the maximum average flame propagation velocity is 136.67 and 113.56 m/s under two conditions.

Key words: gas explosion, explosion venting door, large-diameter pipeline, peak pressure, flame propagation velocity