Fire and Explosion Suppression Performance of Luffa Sponge in Premixed Methane/Air Gas
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摘要: 基于多孔材料阻火隔爆机理，采用管道爆炸系统、压力传感器、高速摄影仪等设备，研究了天然硬质丝瓜络在不同填充位置（距点火端1.9、4.4 m）及不同填充长度（5、8和10 cm）条件下，对甲烷体积分数为9.5%的甲烷-空气预混气体爆炸压力与火焰传播的抑制效果。试验结果表明：丝瓜络在不同工况下均对爆炸压力和火焰传播产生抑制作用，同时又具有障碍物加压效果。具体表现为：丝瓜络填充于距点火端1.9 m时，对爆炸压力与火焰传播速率的抑制效果优于其填充于距点火端4.4 m时；当填充位置一定时，材料的填充长度显著影响爆炸压力与火焰传播速率；当材料填充在距起爆点1.9 m时，3种长度的丝瓜络均完全阻断了火焰传播，尤以填充长度为10 cm时的抑爆效果最佳，相比于未填充工况，其最大爆炸压力和最大爆炸压力上升速率分别降低了73.90%和71.72%。Abstract: Based on the fire and explosion-proof mechanisms of porous materials, pipeline explosion system, pressure sensor, high-speed camera and other equipment were used to study the suppression effects of natural luffa sponge (different filling positions: 1.9 and 4.4 m from the ignition location; different filling lengths: 5, 8 and 10 cm) on the explosion pressure and flame propagation in premixed methane/air gas with methane concentration of 9.5% by volume. The experimental results show that: under different conditions, luffa sponge has inhibitory effect on the explosion pressure and flame propagation. Meanwhile, it has the obstruction pressure effect. When the luffa was filled at a distance of 1.9 m from the ignition location, its inhibition effects on the explosion pressure and flame propagation rate are better than those of filling position at 4.4 m. When the filling position of luffa is constant, the filling length exerts significant influence on the explosion pressure and flame propagation rate. When the material was filled at a distance of 1.9 m from the initial detonation point, the flame propagation was completely blocked by the three lengths of loofah, and the material with the filling length of 10 cm has the best explosion suppression effect. Compared with unfilled condition, its maximum explosion pressure and maximum explosion pressure rising rate decrease by 73.90% and 71.72%, respectively.
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Key words:
- luffa sponge /
- explosion pressure /
- flame propagation /
- filling position /
- filling length
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图 3 填充于位置A时最大爆炸压力随填充长度的变化
Figure 3. Variation of maximum explosion pressure at filling position A with filling length
图 4 填充于位置A时最大爆炸压力上升速率随填充长度的变化
Figure 4. Variation of the maximum explosive pressure rising rate at filling position A with filling length
图 5 填充于位置B时最大爆炸压力随填充长度的变化
Figure 5. Variation of maximum explosion pressure at filling position B with filling length
图 6 填充于位置B时填充管道最大爆炸压力上升速率随填充长度的变化
Figure 6. Variation of the maximum explosive pressure rising rate at filling position B with filling length
图 7 不同长度丝瓜络作用下的火焰传播图像
Figure 7. Flame propagation images with different filling lengths of luffa sponge
图 8 不同长度丝瓜络爆炸测试后数码照片
Figure 8. Digital photographs of luffa sponge with different lengths after explosion test
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