To study the law
of influence of an explosion venting door on gas
explosion characteristics and verify its venting effect and fast sealing
performance, a large-sized explosion pipeline experimental system
was used. The gas explosion tests were carried out under the conditions
of 5.5, 7.5, 9.5, and 11.5% gas concentration. The gas explosion characteristic
parameters were measured by a data acquisition system. The laws of
change in characteristic parameters and the flame-proof effect were
analyzed. The results showed that the pressure peak was attenuated
by 42.25, 50.54, 53.27, and 52.88% under the aforementioned four working
conditions. As the gas volume fraction increased, the peak explosion
pressure decayed as a quadratic function, and the average closing
time of the fire zone was 13 h. This showed that the explosion venting
door had significant explosion venting characteristics and the function
of quickly closing the fire zone. The law of temperature change was
basically the same, no matter how the gas concentration changed, and
the explosion venting door had no inhibitory effect on the gas explosion
flame. Under the four operating conditions, the maximum average values
of the flame propagation speed were 103.56, 105.73, 136.67, and 138.34
m/s. The results of the study provide theoretical support for explosion-proof
technology and emergency rescue technology in coal mines.