International Journal of Hydrogen Energy, Vol.45, No.20, 11866-11874, 2020
The influence of a crimped-ribbon plate on gaseous explosion characteristics in a closed vessel
In this paper, experiments were conducted in a cylinder vessel at room temperature (293 K) and initial pressure 100 KPa to study the effect of a crimped-ribbon plate on the explosion behaviors of methane, propane, ethylene, and hydrogen in air. The research gap of using crimped-ribbon plate obstacles to reduce explosion hazard was filled by testing the change of explosion pressure (P-max), explosion time (theta) and maximum rate of pressure rise (dp/dt)(max). The experimental results showed that a crimped-ribbon plate existence resulted in a drop in maximum explosion pressure due to the remarkable heat loss. With the growing activity (or decreasing MESG) of fuels, the effect of the crimped-ribbon plate on explosion pressure reduced. For hydrogen-air mixtures, the explosion time increased when a crimped-ribbon plate present. But for propane-air mixtures and ethylene-air mixtures, there was no obvious variation trend in the explosion time. The maximum pressure rise rate was decreased when the crimped-ribbon plate was introduced for the more sensitive mixtures (i.e., propane-air, ethylene-air and hydrogen-air mixtures). Two stages appeared when the flame quenched in the slit. The first was the extinguishment of the flame, and the second was that the temperature of the inert gas jet got lowered. After the flammable gas reached a certain concentration, it could no longer pass through the slit channel, because of the speed decrease. The smaller the critical speed for the more active gas. (C) 2020 Published by Elsevier Ltd on behalf of Hydrogen Energy Publications LLC.