Explosion Parameters of Degas-Air Mixtures at Elevated Temperatures

The maximum explosion pressure (pmax), the maximum rate of pressure rise ((dp/dt)max), the deflagration index (KG), the lower explosion limit (LEL), the upper explosion limit (UEL), have been determined in spherical explosion vessel (0.02 m3) for various degas/air mixtures ratios (0.32-2.10) at ambient initial pressure (101 kPa) and four initial temperatures (25 °C, 50 °C,100 °C, 150 °C). The outcome of this preliminary study is to quantify the dependency of explosion parameters on two variables – degas/air equivalence ratios (Φ) and initial temperature (T0). These explosion characteristics are important for design of safety devices (e.g. relief systems, vents), able to ensure active protection of pressure vessels where flammable mixtures are formed.