H2 Ignition by Hot Surfaces: Safety Issues and Test Methods

摘要

Experimental techniques and criteria for estimating the temperature of hot surface ignition have been proposed. The major features of the method are a fine control of fluodynamic conditions, efficient gas analysis, and accurate temperature measurements by real-time thermal imaging of the surface representing the potential ignition source. The ignition phenomenon can be investigated in good detail using resistively heated metal sheets exposed to a flammable mixture under controlled environment. However, electric power generation and dissipation have to be properly managed. By scaling down the testing system to thin filaments, a more versatile procedure can be defined, which provides detailed information on the kinetics of H2 oxidation. These experimental methods can be applied to different metallic materials representing potentials ignition sources and to richer hydrogen mixtures, in order to create a comprehensive database to be utilized in a wide range of risk analysis scenarios.