超声细水雾抑制管内瓦斯爆炸的试验  

Experiment for gas burst or explosion suppression via the ultrasonic water mist

作　　者：王发辉[1] 陈卫 温小萍 余明高[2] WANG Fa-hui;CHEN Wei;WEN Xiao-ping;YU Ming-gao(School of Safety Science and Engineering,Henan Polytechnic University,Jiaozuo 454003,Henan,China;State Key Laboratory ofCoal Mine Disaster Dynamics and Control,Chongqing University,Chongqing 400044,China)

机构地区：[1]河南理工大学安全科学与工程学院,河南焦作454003 [2]重庆大学煤矿灾害动力学与控制国家重点实验室,重庆400044

出　　处：《安全与环境学报》2019年第6期1971-1977,共7页Journal of Safety and Environment

基　　金：国家自然科学基金项目(51774115)

摘　　要：为了研究不同超声细水雾浓度和瓦斯体积分数条件下瓦斯爆炸的火焰结构、火焰传播速度及爆炸压力的变化规律,自行设计搭建了尺寸为150 mm×150 mm×1 700 mm的透明有机玻璃试验台和细水雾生成系统。使用M310高速摄像仪获取火焰传播的动态过程,使用Keller PR-23高频压力传感器获取压力的变化情况。通过分析试验结果,探讨了超声细水雾抑制瓦斯爆炸的机理。结果表明:与无水雾工况相比,添加超声细水雾后,火焰温度降低;瓦斯体积分数为9. 5%时,瓦斯爆炸火焰传播速度的最大值由35. 8m/s降为19. 2 m/s,下降了46. 4%,爆炸压力最大值由1. 53×104Pa降为1. 05×104Pa,下降了31. 4%;瓦斯体积分数为8. 5%时,瓦斯爆炸火焰传播速度的最大值由30. 6 m/s降为19. 8 m/s,下降了35. 3%,爆炸压力最大值由9. 87×103Pa降为4. 60×103Pa,下降了53. 4%;且随喷雾时间增加,水雾质量浓度逐渐增大,火焰传播速度和瓦斯爆炸压力最大值下降程度更加明显。研究表明,超声细水雾具有极好的抑爆效果。The paper has designed a transparent plexiglass chamber with a set of water spray devices,whose tubes are 150 mm × 150 mm × 1 700 mm,so as to investigate the variation of the flame structure,speed and pressure in the gas explosion under different ultrasonic water mist concentration and gas concentration rates. As a matter of fact,the experiments to be done with in this paper have to be conducted at night in hoping to eliminate the interference of other sorts of the light sources besides the ignition signal. Therefore,it is necessary to use a camera that is able to produce a M310 high-speed video to visualize the dynamic process of the flame propagation. In doing so,we have adopted the Keller PR-23 high-frequency pressure transducers to acquire the information of the pressure. At the same time,the synchronous control circuitry has been taken to ensure the synchronization of the ignition,whereas the camera flash and the data acquisition as well as the registration of how the exhaust is done are to be used for register the gas distribution. Thus,based on the experimental results,we have made a careful and detailed discussion of the mechanism of the gas explosion suppression with the ultrasonic water mist. The experimental results we have gained have shown that,as compared with the conditions of the water face mist,the color of the explosion flame has also been found changing from blue-violet to red-yellow. At the same time,the flame temperature has also been decreasing with the addition of the superfine water mist. For example,in case when the volume fraction of the gas is 9. 5%,the greatest flame propagation speed has to drop from 35. 8 m/s to 19. 2 m/s,which has actually been dropped by 46. 4%. On the other hand,the maximum explosion pressure may also tend to fall from 1. 53 × 104 Pa to 1. 05 × 104 Pa,a reduction rate of 31. 4%. On the other hand,when the volume fraction rate of the gas is 8. 5%,the maximum flame propagation velocity of the gas explosion would also be reduced from 30. 6 m/s to 19. 8 m/s,equal

关 键 词：安全工程 瓦斯爆炸 超声细水雾 火焰速度 爆炸压力 抑爆 

分 类 号：X932[环境科学与工程—安全科学]