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为研究综合管廊内天然气管道泄漏引发的火灾,根据小孔泄漏模型计算了天然气泄漏速率和火焰速度,使用FDS分别对封闭空间中和通风条件下天然气泄漏火灾进行了数值模拟。模拟结果显示:在封闭空间中,一个防火分区的天然气舱内空气仅能支持天然气燃烧3分钟,火灾温度达到1300℃,高温区主要集中在泄漏孔上方;在通风条件下,火灾会持续燃烧,并从出风口溢出,最高温度为840℃,低于封闭空间中的温度。对比两种工况,封闭空间中虽然火灾温度较高,但持续时间短,对结构损害更低,同时可以阻止泄漏天然气扩散到其他区域。
In order to study the fire caused by the natural gas pipeline leakage in the integrated pipe gallery, the natural gas leakage rate and the flame speed were calculated according to the small hole leakage model. The FDS was used to simulate the natural gas leakage fire in closed space and ventilation respectively. The simulation results show that in a confined space, the air in a natural gas compartment of a fireproof zone can only support natural gas combustion for 3 minutes, the fire temperature reaches 1300 ℃, and the high temperature zone mainly concentrates above the leak holes; under the ventilation conditions, the fire will continue to burn, And overflow from the outlet, the maximum temperature of 840 ℃, lower than the enclosed space temperature. Contrasting the two conditions, although the fire temperature in confined space is high, it has a short duration and low damage to the structure, and at the same time can prevent leakage of natural gas from spreading to other areas.