Influence of exhaust outlet height on efficiency of removing leaked hydrogen in industrial occasions

Taking a workshop as the research object, the effect of the distance from the upper edge of the exhaust outlet to the top on removing the leaked hydrogen and air mixture is calculated by numerical simulation. The results show that the plume development patterns are different in different air change rates. When the air change rate is 1 h-1, the discharge efficiency within the range of 0-0.7 m from the upper edge of the side wall exhaust outlet to the top is almost unchanged, with an average of 1.20. When the distance is increased to 0.8 m, the discharge efficiency decreases by 54.4%, which is not conducive to the removal of the mixture. When the air change rate is 1, 3 and 6 h-1 respectively, the distance between the upper edge of the side wall exhaust outlet and the top is about 0.1 m, and there is no obvious change in the discharge efficiency. This is different from the relevant provisions of the current specifications that “when used to remove the mixture of hydrogen and air, the distance between the upper edge of the exhaust outlet and the ceiling plane or roof is not more than 0.1 m.”