煤厚异常区煤-瓦斯两相流传播特征试验研究  

Experimental study on propagation characteristics of coal-gas two-phase flow in abnormal coal thickness area

作　　者：李亮[1] 高魁[1,2] 乔国栋 李梦娣 LI Liang;GAO Kui;QIAO Guodong;LI Mengdi(School of Safety Science and Engineering,Anhui University of Science and Technology,Huainan 232001,China;MOE Key Lab of Mine Safety and High Efficient Mining,Anhui University of Science and Technology,Huainan 232001,China)

机构地区：[1]安徽理工大学安全科学与工程学院,安徽淮南232001 [2]安徽理工大学煤矿安全高效开采省部共建教育部重点实验室,安徽淮南232001

出　　处：《实验技术与管理》2023年第8期20-26,共7页Experimental Technology and Management

基　　金：安徽省自然科学基金项目(2208085ME125);国家自然科学基金项目(51604010);煤矿深井开采灾害防治技术科技研发平台(安徽理工大学)开放基金项目(DPDCM2204);安徽省高校优秀青年人才支持计划项目(gxyq2022016)。

摘　　要：为充分认识地质构造带煤厚异常区煤-瓦斯两相流的传播规律,该试验借助多场耦合大型真三维液压加载煤与瓦斯突出模拟试验系统,研究煤厚异常区瓦斯突出后冲击气流的动力特征以及煤粉的运移规律。试验结果表明:在瓦斯突出前期,煤-瓦斯两相流的传播特征呈现湍流脉动特性,围绕平均值上下波动;在突出阶段,异常区煤体内部瓦斯积攒的膨胀能得到释放,冲击气流通过曳力作用携带煤粉向管道中运移,气流在管道中扰动时间持续6s左右,冲击压力呈现出先增大后减小的趋势。距离突出口越远,冲击气压峰值衰减幅度越明显,出现压力峰值的时间越是滞后。煤-瓦斯两相流在运移过程中只有少部分气流发生扩散,该部分气流冲击气压峰值远小于主巷道冲击气压峰值,携带煤粉能力也较弱;突出发生后,高速气流携带的煤粉以射流状向管道中运移,煤粉的运移速度分为初期加速和后期衰减两个阶段,煤粉的速度越大,在管道中出现分层现象越明显。突出管道中堆积的煤粉整体近似处于正态分布,中部区域堆积大量煤粉,占管道中总煤粉的68.8%,前后区域煤粉分布较少。In order to fully understand the propagation law of coal-gas two-phase flow in the area with abnormal coal thickness in the geological structure zone,this test studies the dynamic characteristics of the impact gas flow and the migration law of coal powder after gas outburst in the area with abnormal coal thickness through the use of the multi-field coupling large true three-dimensional hydraulic loading coal and gas outburst simulation test system.The test results show that in the early stage of gas outburst,the propagation characteristics of coal-gas two-phase flow show the characteristics of turbulent fluctuation,fluctuating up and down around the average value.In the outburst stage,the expansion energy of gas accumulation in the coal body in the abnormal area is released,and the impact gas carries the pulverized coal into the pipeline through the drag force.The disturbance time of the gas flow in the pipeline lasts about 6 s,and the impact pressure shows a trend of increasing first and then decreasing.The farther away from the protrusion,the more obvious the attenuation amplitude of the peak value of the impact air pressure,and the more delayed the time when the peak value of the pressure occurs.During the migration of coal-gas two-phase flow,only a small part of air flow diffuses,and the peak impact pressure of this part of air flow is far less than the peak impact pressure of the main roadway,and the ability to carry pulverized coal is also weak.After the outburst,the pulverized coal carried by the high-speed airflow moves into the pipeline in a jet shape.The migration speed of pulverized coal is divided into two stages:Initial acceleration and late attenuation.The higher the speed of pulverized coal,the more obvious the stratification phenomenon appears in the pipeline.The pulverized coal accumulated in the protruding pipeline is generally in Normal distribution.A large amount of pulverized coal accumulates in the middle area,accounting for 68.8%of the total pulverized coal in the pipeline.There is less pul

关 键 词：煤与瓦斯突出 冲击气流 压力峰值 煤粉运移 

分 类 号：X936[环境科学与工程—安全科学]