硅酸铝棉对火焰速度和爆炸超压的抑制作用

Suppression of flame speed and explosion overpressure by aluminum silicate wool

为研究硅酸铝棉位置、长度对预混气体爆炸超压和火焰速度的抑制规律,进行了硅酸铝棉抑制管道内预混气体爆炸实验,在管路内置入硅酸铝棉,以室温常压下化学计量浓度的C2H2/air预混气体为介质。结果表明,当硅酸铝棉长度超过速度临界长度时,能够有效抑制火焰速度。当硅酸铝棉长度超过压力临界长度时,能够有效抑制爆炸超压。速度临界长度的大小与硅酸铝棉入口火焰速度有关。压力临界长度的大小与硅酸铝棉入口爆炸超压有关。压力临界长度小于速度临界长度,说明硅酸铝棉对压力的抑制效果更加显著。

An experimental device was established and it included a test pipeline with 89-mm diameter, 4.5-mm wall thickness and 300-mm length. By choosing the stoichiometric premixed C2 H2-air gas as the objective, the established device was used to experimentally explore the suppression effect of the premixed gas flame propagation and explosion overpressure by the different-length aluminum silicate wool at the different positions in the pipeline. The results demonstrate that when the length of the a- luminum silicate wool surpasses the critical length for the flame speed, the aluminum silicate wool can suppress the flame speed. When the length of the aluminum silicate wool surpasses the critical length for the pressure, the aluminum silicate wool can suppress the explosion overpressure. The critical length of the aluminum silicate wool for the flame speed is related to the flame speed at the inlet, whereas the critical length of the aluminum silicate wool for the explosion overpressure is relevant to the explosion overpressure at the inlet. The critical length for the pressure is smaller than that for the flame speed. It can display that the aluminum silicate wool can suppress the pressure waves more effi- ciently.