• 论文
主办单位:煤炭科学研究总院有限公司、中国煤炭学会学术期刊工作委员会
煤粉粒径对突出瓦斯-煤粉动力特征影响试验研究
  • Title

    Influence of coal powder particle sizes on dynamic characteristics of coal and gas outburst

  • 作者

    王凯王亮杜锋张翔娄振辛程鹏崔心源

  • Author

    WANG Kai1,2,3 ,WANG Liang1,2 ,DU Feng1,2,5 ,ZHANG Xiang1,2 ,LOU Zhen1,2 ,XIN Chengpeng4 ,CUI Xinyuan1

  • 单位

    中国矿业大学(北京) 应急管理与安全工程学院中国矿业大学(北京) 共伴生能源精准开采北京市重点实验室中国矿业大学(北京) 煤炭资源与安全开采国家重点实验室贵州工程应用技术学院 矿业工程学院哥伦比亚大学 土木工程力学系

  • Organization
    1. School of Emergency Management and Safety Engineering,China University of Mining & Technology ( Beijing),Beijing  100083,China; 2. Beijing Key Laboratory for Precise Mining of Intergrown Energy and Resources,China University of Mining & Technology (Beijing),Beijing  100083,China; 3. State Key Laboratory of Coal Resources and Mine Safety,China University of Mining & Technology (Beijing),Beijing  100083,China; 4. School of Mining Engineering, Guizhou University of Engineering Science,Bijie  551700,China; 5. Department of Civil Engineering and Engineering Mechanics,Columbia University,New York  10027,United States
  • 摘要

    为了进一步研究煤与瓦斯突出机理以及突出煤粉粒径对突出瓦斯-煤粉动力特征影响机制,研制了突出粉煤-瓦斯两相流模拟试验系统。设置的管内安装传感器可用于同时测量突出气体冲击力以及运动煤粉对传感器的打击。煤粉在试验巷道内的动态传播特征可由传感器受到的打击情况进行分析。另外,针对目前纹影仪无法观察圆形管道内流场的问题,从纹影效果失效的原理出发,设计了一种用于观察圆形管道内流场的纹影系统直接研究突出激波波阵面的传播。利用试验系统进行4种煤粉粒径的突出试验,重点观测了突出气流冲击力、激波波阵面传播、煤粉冲击等参数。研究结果表明:气流冲击波速度远大于煤粉运动速度,在试验巷道中的突出气流冲击波在时间上会先于煤粉到达试验巷道的任何位置,气流冲击波到达传感器之后压力会在极短的时间内达到最大值,峰值压力能够保持0.01 s左右。气体冲击力随着煤粉粒径目数的增加而增加,试验中4种粒径下气体冲击力平均依次增加10.9%,11.4%,7.6%。气体冲击力在巷道内传播先增强后衰减,粒径80-200目情况下,2.27,4.27,6.27和8.27 m处传感器冲击波强度依次增强13.6%、衰减13.4%、衰减20.6%。随着距离的增加煤粉对传感器的打击力呈明显的减弱趋势。煤粉运动速度随着煤粉粒径目数的增加而增加,试验中4种粒径下,试验巷道内煤粉平均速度分别为34.4,37.3,39.1,41.7 m/s。煤粉速度在巷道内先加速后减速,粒径80-200目情况下,4个巷道内煤粉平均速度依次增加31.4%、减小12.2%、减小13.1%。纹影系统可观测到突出激波波阵面,激波波阵面垂直于试验管道轴线向突出方向高速运动。纹影计算得到波阵面的传播速度与理论间接计算值具有很好的一致性。

  • Abstract
    In order to further study the mechanism of coal and gas outburst and the mechanism of the influence of coal powder particle sizes on the dynamic characteristics of outburst gas and coal,a coal and gas outburst two-phase flow simulation test system is developed. The pressure sensors installed in the test roadways have the ability to measure the impact of the protruding gas and the impact of the moving coal powder on the sensors. In addition,considering the principle why schlieren effect fails in current schlieren system when observing the flow fields in the circular pipe,an improved schlieren system to observe the flow field in a circular pipeline is designed which greatly helps the research on the propagation of the shock wave front. The test system is used to carry out the outburst experiments of four kinds of pulverized coal particle sizes,and the parameters such as the airflow impact force,the shock wave front propagation, and the pulverized coal impact are mainly observed. The results show that the velocity of the airflow shock wave is much larger than that of the coal powders. In the test roadways,the airflow shock wave arrives at any position of the test roadways ahead of the coal powders;the pressure will reach the maximum in an extremely short time after the air- flow shock wave reaches the sensors. The peak pressure could be maintained for about 0. 01 s. The airflow impact force increases with the increase of the particle size of the pulverized coal. The gas impact force of the four selected particle sizes increases by 10. 9% ,11. 4% and 7. 6% . The increase of void ratio is not the main reason for the increase of air- flow impact. The increase of gas analysis speed caused by the increase of specific surface area is the main reason for the increase of airflow impact. The airflow impact is enhanced at first and then attenuated in the roadways,and for the coal powders size of 80-200 mesh,in the position of 2. 27,4. 27,6. 27 and 8. 27 m,the shock wave force on the sensor is increased by 13. 6% ,attenuated by 13. 4% ,and attenuated by 20. 6% . The reflection and re-reflection of the shock wave are normal scenes of the shock waves in the non-uniform propagation paths,which is the case of both coal mine airways and the test experiment. As the distance of the sensors increases,the impacts of the coal powders on the sen- sors are significantly weakened. The speed of the coal powders increases with the increase of coal powders meshes. The average coal powder velocity in the four test roadways are 34. 4,37. 3,39. 1 and 41. 7 m / s,respectively. The coal pow- der speed is accelerated and then decelerated in the roadways,and for the coal powder size of 80-200 mesh,the coal the average coal powder speed increased by 31. 4% ,12. 2% and 13. 1% in the four roadways. Both the airflow impact and the coal powder movement speed have a law of increasing at first and then decreasing,but there is no direct causal relationship between them. The schlieren system observes the prominent shock wave front,which is perpendicular to the roadway axis and moves at high speed. The propagation velocity of the wavefront calculated by schlieren system is consistent with theoretical calculation. The airflow impact denotes the stagnation pressure by the shock wave forefront to the sensor facing instantaneously,while the average speed of coal powders in the roadways indicates the velocity of the particle determined by air flow and resistance within a certain period of time. The gas impact arrival sensor instan- taneously produces a stagnation pressure that represents only the strength of the shock wave front at the forefront of the impinging airflow. The average velocity of pulverized coal in the pipeline indicates the velocity of pulverized coal deter- mined by gas power and other resistance for a certain period of time.
  • 关键词

    煤与瓦斯突出两相流冲击动力纹影系统

  • KeyWords

    coal and gas outburst;two-phase flow;dynamics of impact;schlieren system

  • 基金项目(Foundation)
    国家重点研发计划资助项目(2016YFC0600708);国家自然科学基金资助项目(51874314,51774292)
  • DOI
  • Citation
    WANG Kai,WANG Liang,DU Feng,et al. Influence of coal powder particle sizes on dynamic characteristics of coal and gas outburst[J]. Journal of China Coal Society,2019,44(5):1369-1377.
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