Experimental investigation on the temperature characteristics and hydrogen elimination effect of non-premixed hydrogen-oxygen recombination reaction at ambient temperature

Abstract

Hydrogen-oxygen recombination is a safe and effective method of eliminating hydrogen before the explosion occurs. Most existing studies have focused on material modification, but the dynamic response of this reaction is rarely reported. In this paper, a series of experiments catalyzed by the Platinum-Carbon catalyst was carried out in a cylindrical container of 250 cm3 to study the effects of hydrogen volume fraction, catalyst position, and catalyst usage status on the temperature characteristics and hydrogen conversion. The results show that the reaction temperature on the catalyst surface not only increases and then decreases with the increase of hydrogen volume fraction but also decreases as the distance between the catalyst and the bottom increases, except for the 40 vol% volume fraction of hydrogen, and the maximum value occurs at the hydrogen volume fraction of 70 vol%. Moreover, there is an uncertainty in the temperature relationship between the catalyst surface and below as the volume fraction of hydrogen increases. The temperature peak structure on the catalyst surface is only influenced by the catalyst position and hydrogen volume fraction, and two temperature peaks can be observed in most cases. However, the hydrogen conversion is not affected by the catalyst position and its usage status.