Study on methane explosion and dynamic discharge testing of rupture discs inside pressure vessels
In the event of an explosion within a pressure vessel due to chemical reaction,the rapidly rising pressure significantly affects the venting performance of rupture discs.A dynamic overpressure test platform for rupture discs was established,and methane-air mixture explosion tests were conducted under different initial pressure and concentration conditions.The results indicate that within the range of methane concentrations from 5.5% to 14%,the maximum explosion pressure and pressure rise rate first increase and then decrease with increasing methane concentration,when methane concentration reaches a peak at 10%,both reach the peak.Fitting relationships among the maximum explosion pressure,pressure rise rate,and methane concentration under different initial pressure conditions were successfully established using the global optimization algorithm,and the fitting effect is good.Under dynamic loading conditions,the actual bursting pressure of both types of rupture discs far exceeds their calibrated bursting pressure,and when the LP25-20.1 type rupture disc reaches an uplift rate of 170 MPa/s,the overpressure multiple reaches as high as 1.7.The results of this study provide an important basis for the study of methane explosion characteristics inside pressure vessels and the design and use of rupture discs under dynamic overpressure conditions.