Effect of hydrogen ratio on inhibition property of wire mesh to propagation of the flame by methane premixed with hydrogen
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摘要: 为进一步揭示金属丝网阻抑掺氢甲烷燃烧火焰传播特征的规律，通过实验研究了掺氢比例对不同孔隙密度金属丝网阻火过程的影响。结果表明：随着掺氢比例的增加，金属丝网的阻火难度加大，金属丝网的阻火效果可由成功转为失败，对火焰传播的影响作用可能从抑制转变为促进；当金属丝网阻火失败时，金属丝网会引起火焰褶皱并导致火焰加速，但郁金香形火焰的首现时间有所延迟；随着掺氢比例的增大，火焰穿过金属丝网后的加速现象更为明显；提高金属丝网孔隙密度可提高金属丝网对掺氢甲烷预混火焰的阻火能力，孔隙密度越大，阻火能力越强；60 mpi以上金属丝网能够有效淬熄掺氢甲烷预混火焰。Abstract: In order to further reveal the characteristic of metal mesh to inhibit the flame propagation of hydrogen-methane premixed mixture, hydrogen and methane mixed gas with hydrogen mixing ratio of 0%, 10%, 20% and 30% were selected to conduct the experimental investigation of the effect of hydrogen mixing ratio inhibiting the fire processing through wire mesh with varied size in an explosion pipeline with an inner diameter of 60 mm and a total visible length of 1024 mm. Firstly, the flame propagation process was recorded by a high-speed camera, and the effect of hydrogen mixing ratio on fire resistance of wire mesh with different mesh numbers and the change of flame morphology were analyzed. Secondly, the average velocity of flame front movement was calculated according to the interval of 50 mm, and the flame propagation velocity within the visible area of the pipeline was analyzed. The interaction law between the metal wire mesh and the flame was mainly characterized by the flame propagation velocity on both sides of the metal wire mesh. The results show that with the increase of hydrogen content, the difficulty of flame retardancy of metal wire mesh increases, and the flame retardancy effect of metal wire mesh can transition from success to failure, and the impact on flame propagation may shift from inhibition to promotion. When the wire mesh fails to resist the fire, the wire mesh will cause the flame to fold and cause the flame to accelerate, but the first appearance of the tulip flame is delayed. With the increase of hydrogen mixing ratio, the acceleration phenomenon of flame passing through the wire mesh is more obvious. Increasing the mesh number of wire mesh can improve the fire resistance of wire mesh to hydrogen-methane premixed flame. The larger the mesh number, the stronger the fire resistance. More than 60 mesh wire mesh can effectively quench hydrogen and methane premixed flame.
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Key words:
- hydrogen-methane /
- flame inhibition /
- wire mesh /
- hydrogen mixing ratio /
- flame propagation velocity
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图 3 空管内不同掺氢比例的火焰传播图像
Figure 3. Flame propagation images with different hydrogen mixing ratios in the empty pipe
图 4 掺氢比例为20%时不同孔隙密度金属丝网管道内的火焰传播图像
Figure 4. Flame propagation images with the hydrogen mixed ratio of 20% in tubes with different mesh density
图 5 不同掺氢比例下的火焰在40 mpi金属丝网管道内的传播图像
Figure 5. Flame propagation images with different hydrogen mixing ratios in a 40 mpi wire mesh pipe
图 6 空管火焰传播速度-距离变化曲线
Figure 6. Variation curves of flame propagation velocity and distance in an empty pipe
图 7 不同掺氢比例下的火焰传播速度-距离变化曲线
Figure 7. Variation curves of flame propagation velocity and distance under different hydrogen mixing ratios
表 1 金属丝网几何参数
Table 1. Geometric parameters of wire mesh
序号 孔隙密度/mpi 孔径/mm 丝径/mm 1 10 2.3 0.35 2 20 1.1 0.21 3 40 0.5 0.13 4 60 0.3 0.10 
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表 2 当量比为1时掺氢甲烷混合气体配比
Table 2. Mixture ratio of hydrogen and methane when equivalent ratio is 1
% 掺氢比例 甲烷体积分数 氢气体积分数 空气体积分数 掺氢比例 甲烷体积分数 氢气体积分数 空气体积分数 0 9.50 0 90.50 20 8.80 2.20 89.00 10 9.18 1.02 89.80 30 8.36 3.58 88.06
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表 3 各工况下金属丝网阻火情况
Table 3. Fire resistance effect of wire mesh under different working conditions
孔隙密度/mpi 阻火效果 孔隙密度/mpi 阻火效果 φ=0% φ=10% φ=20% φ=30% φ=0% φ=10% φ=20% φ=30% 10 N N N N 40 Y N N N 20 N N N N 60 Y Y Y Y
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表 4 不同掺氢比例预混气体的最大试验安全间隙
Table 4. Maximum examination saftey gap of premixed gas with different ratio of hydrogen
掺氢比例/% MESG/mm 掺氢比例/% MESG/mm 0 1.14 20 0.90 10 1.03 30 0.83
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