气固复配灭火剂对瓦斯爆炸引燃初期火焰发展的影响

发布时间：2018-06-09 11:19

本文选题：瓦斯爆炸 + 复配灭火剂　；参考：《西安科技大学》2017年硕士论文

【摘要】：瓦斯爆炸是我国煤矿事故的五大灾害之一,如何有效防治具有十分重要的意义。本文利用具有可视化功能的20L多功能球形气体/粉尘爆炸实验装置和高速数字摄像机,选取C3HF7和NaHCO3作抑爆剂,通过研究不同浓度的CH4在C3HF7、NaHCO3和气固复配灭火剂条件下爆炸火焰图像,分析了其对瓦斯爆炸的火焰结构及传播规律的影响。实验结果表明:(1)随着爆炸总时间的增加,火焰轮廓由圆形逐渐向苹果形发展,再由苹果形状逐渐向蘑菇云形发展,由于NaHCO3的团聚性使得爆炸反应容器中的爆炸混合物分布不均匀,出现火焰轮廓不规则形状;火焰轮廓圆滑的图像都是左右对称图像;随着甲烷爆炸强度的减弱,火焰中心向上发生偏移;由于NaHCO3粉末的反射作用火焰发光相对较强。(2)添加C3HF7,8%、9.5%、11%的CH4爆炸火焰传播速度下降幅度依次为63.7%、84.7%、92.7%;添加NaHCO3,不同浓度的CH4爆炸火焰传播速度明显下降,抑爆效果明显,但NaHCO3量的变化对CH4爆炸的速度影响变化较小;C3HF7气体与NaHC03粉体复配抑制CH4爆炸,火焰传播速度下降幅度最大依次为75.4%、88.8%、100%,说明C3HF7与NaHCO3复配抑制CH4爆炸,对高浓度的CH4的影响较大,对低浓度的CH4的影响较小。瓦斯爆炸引燃初期,火灾引起的损失较小,研究初期火焰发展对抑制瓦斯爆炸具有重要的意义。
[Abstract]:Gas explosion is one of the five major disasters in coal mine accidents in China. C3HF7 and NaHCO3 are selected as explosion-suppressants using 20L multi-function spherical gas / dust explosion experimental device and high-speed digital camera. The effects of different concentrations of Ch _ 4 on the flame structure and propagation law of gas explosion were studied under the condition of C _ 3HF _ 7 NaHCO _ 3 and gas-solid composite fire extinguishing agent. The experimental results show that with the increase of the total explosion time, the flame profile gradually develops from the circle to the apple shape, and then from the apple shape to the mushroom cloud shape. Because of the agglomeration of NaHCO3, the explosive mixture in the explosion reaction vessel is distributed inhomogeneously, and the shape of the flame contour is irregular. The smooth images of the flame contour are all left and right symmetrical images; as the explosion intensity of methane decreases, The flame center shifted upward because of the reflection of NaHCO3 powder, the flame luminescence was relatively strong. (2) the flame propagation velocity of CH4 explosion decreased by 63.7% and 84.7% respectively, and the propagation velocity of CH4 explosive flame with different concentrations decreased obviously when NaHCO3 was added. The effect of explosion suppression was obvious, but the effect of NaHCO3 on the rate of Ch _ 4 explosion was smaller than that of the mixture of C _ 3HF _ 7 and NaHC03 powder. The decrease of flame propagation velocity was 75.488. 8. 8% and 100% respectively, which indicated that the combination of C _ 3HF _ 7 and NaHCO _ 3 inhibited Ch _ 4 explosion. The effect on high concentration of Ch 4 is greater than that on low concentration of Ch 4. In the early stage of gas explosion ignition, the loss caused by fire is relatively small, so it is of great significance to study the development of flame in the early stage to suppress gas explosion.
【学位授予单位】：西安科技大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TD712.7;TD753

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