主管：中华人民共和国应急管理部
主办：应急管理部天津消防研究所
ISSN 1009-0029  CN 12-1311/TU
消防科学与技术

消防科学与技术 ›› 2022, Vol. 41 ›› Issue (10): 1445-1450.

• • 上一篇    下一篇

超细干粉气固两相流在水平直管中的流动特性研究

季经纬1,3，蔡伟明1,3，田志坚2，寇 江1,3   

  1. (1. 中国矿业大学 江苏省城市地下空间火灾防护高校重点实验室,江苏 徐州 221116；2．徐工集团徐工消防安全装备有限公司，江苏 徐州 221004；3. 中国矿业大学 安全工程学院，江苏 徐州 221116)
  • 出版日期:2022-10-15 发布日期:2022-10-15
  • 作者简介:作者简介：季经纬(1976- )，男，江苏泰州人，中国矿业大学安全工程学院教授，博士，主要从事火灾科学与消防工程研究，江苏省徐州市大学路1号，221116。

Research on flow characteristics of ultra-fine dry powder gas-solid two-phase flow in horizontal straight pipe

Ji Jingwei1,3, Cai Weiming1,3,Tian Zhijian2, Kou Jiang1,3   

  1. (1. Jiangsu Key Laboratory of Fire Safety in Urban Underground Space, China University of Mining and Technology, Jiangsu Xuzhou 221116, China; 2. XCMG Fire-Fighting Safety Equipment Co., Ltd., Jiangsu Xuzhou 221004, China; 3. School of Safety Engineering, China University of Mining and Technology, Jiangsu Xuzhou 221116, China)
  • Online:2022-10-15 Published:2022-10-15

摘要： 摘 要：采用Fluent软件，利用欧拉多相流模型模拟了粒径为18m的超细干粉灭火剂在直径8 cm的水平直管内喷射时的沿程阻力、横截面上流速及干粉体积分数分布特点。结果表明，在流速为25~150 m/s和超细干粉体积分数为5%~15%时，水平直管的沿程阻力与流速呈二次函数关系，与干粉的体积分数呈一次函数关系，阻力值为0.003 28~0.259 81 MPa/m。受管壁摩擦力影响，两相流在管道横截面上的流速呈现中间快四周慢的分布特点，而固体颗粒体积分数对流速的影响可以忽略。横截面上速度分布不同所产生的气相曳力导致超细干粉体积分数呈环状分布，气相曳力与初始速度有关，与干粉体积分数无关。流速低于70 m/s时超细干粉呈月牙状分布，管道下部贴近管壁位置体积分数最高，超过此流速时，超细干粉在横截面上0.8r~0.9r范围体积分数最高，呈环状分布，贴近管壁位置体积分数最低，流速大于70 m/s可有效抑制超细干粉沉降。

关键词: 关键词：气固两相流, 超细干粉, 数值模拟, 沿程阻力

Abstract: Abstract: According to the ventilation safety theory and the CFD method based on the component transport model, the ventilation safety characteristics and appropriate performance evaluation indices of the circular coal dome are discussed. Taking the circular coal dome with a diameter of 100 m as an example, the effects of the opening mode, position and geometric size of the circular vent on the distribution, transport characteristics and removal efficiency of coal dust and gas are studied, and the optimal vent design parameters are obtained. The research results show that in the case of single annular opening, the vent is changed from horizontal to lateral, which can improve the internal environment and improve the removal efficiency of pulverized coal dust and harmful gas. The recommended height of the lateral annular vent is 2 m. Adding an annular opening in the middle of the dome can effectively reduce the concentration of suspended pollutants at the height of 30-35 m above the coal dome. The optimal positions of the double ring openings are 15 and 31 m respectively, which can make the dust mass concentration in most areas of the coal dome lower than 10 mg/m3; The mass concentration of CO2 gas is lower than 30 mg/m3; The highest sewage discharge efficiency is nearly 80%. The research results can provide reference for ventilation safety design of super large space circular coal dome.

Key words: Key words: large space circular coal storage dome, ventilation safety, CFD method, opening, optimal design