Abstract
Frictional processes caused by faults can lead to hot surfaces and mechanical sparks. On this basis, two ignition modes with mechanical spark and hot surface as ignition source are determined to ignite hydrogen. Temperature development tests as well as ignition tests are carried out in friction equipment according to the applied friction strength and different materials. The temperature of the hot surface is detected by thermocouples and an infrared camera. Results show that as the wear rate increases, the maximum temperature decreases. At a friction pressure of 22.24 N and friction speed of 10.47 m/s, the peak temperatures of cast iron, 304 stainless steel, and 316 stainless steel are 750 ± 7.5 °C, 773 ± 7.7 °C and 781 ± 7.8 °C, respectively. The lower the thermal conductivity of the metallic material, the higher the maximum temperature reached by the hot surface. The ignition delay time mainly depends on the friction strength and the thermal conductivity of the metal. The lowest friction-ignitable concentrations (LFCs) of hydrogen are determined under different friction conditions. As the friction strength increases, the LFCs of hydrogen decrease. The LFCs of 304 and 316 stainless steel to ignite hydrogen are lower than those of cast iron.
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