The present work aims to provide theoretical support to prevent LPG explosion accidents and reduce its hazardous effect. The explosion of LPG-air mixtures (4.0 % - 9.0 % in volume) under N and CO dilution (0.0%-30.0% in volume) was experimentally investigated by using a 20-L vessel at ambient temperature and pressure. The parameters of the maximum explosion pressure (p), time to reach the maximum explosion pressure (t), maximum rate of the pressure rise ((dp/dt)), time to reach the maximum rate of the pressure rise (t), and average velocity of flame propagation (v) were investigated. In addition, the inerting efficiencies of N and CO were compared and analyzed. The results show that there exists a cubic function relation among p, (dp/dt), t, t and LPG volume fraction during the LPG explosion process. At the volume fraction of LPG was 5.7 %, all parameters reached peak values. The addition of N and CO effectively suppressed the explosion of LPG, reduced p, (dp/dt), and v and extended t and t. At a low LPG volume fraction, the inerting efficiency of CO was higher than that of N. At a high LPG volume fraction, the inerting efficiency of N was higher than that of CO.
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