中国安全科学学报 ›› 2017, Vol. 27 ›› Issue (1): 53-58.doi: 10.16265/j.cnki.issn1003-3033.2017.01.010

• 安全工程技术科学 • 上一篇    下一篇

煤粉粒径对粉尘爆炸影响试验研究与数值模拟

何琰儒1,2, 朱顺兵1,2 教授, 李明鑫1,2, 吴倩倩1,2, 曹元1,2, 周征1,2   

  1. 1 江苏省危险化学品本质安全与控制技术重点实验室,江苏 南京 210009
    2 南京工业大学 安全科学与工程学院,江苏 南京 210009
  • 收稿日期:2016-10-19 修回日期:2016-12-16 发布日期:2020-11-23
  • 通讯作者: 朱顺兵(1967—),男,江苏南京人,硕士,教授,主要从事安全监测监控技术、火灾爆炸及其防治研究。E-mail:13913399658@139.com。
  • 作者简介:何琰儒 (1993—),男,广东东源人,硕士研究生,研究方向为工业火灾与爆炸。
  • 基金资助:
    国家自然科学基金资助(21576136)。

Experimental study and numerical simulation of effect of coal particle size on dust cloud explosion

HE Yanru1,2, ZHU Shunbing1,2, LI Mingxin1,2, WU Qianqian1,2, CAO Yuan1,2, ZHOU Zheng1,2   

  1. 1 Jiangsu Key Laboratory of Hazardous Chemicals Safety and Control, Nanjing Jiangsu 210009, China
    2 College of Safety Science and Engineering, Nanjing Tech. University, Nanjing Jiangsu 210009, China
  • Received:2016-10-19 Revised:2016-12-16 Published:2020-11-23

摘要: 为分析煤粉粉尘的爆炸特性,利用20 L爆炸球测试装置与Fluent软件,试验研究煤粉粒径、质量浓度对煤粉云最大爆炸压力、爆炸指数的影响。结果表明,当试验环境温度为293~303 K时,点火能量为10 kJ,粒径为26,73和115 μm等3种粉尘云的最大爆炸压力均随着粉尘质量浓度的增加先升后降,在350 g/m3处达到最大值。同一粉尘质量浓度下,最大爆炸压力、爆炸指数均随着粒径的减小而增大。在60~120 ms时间内,粒径为26 μm、质量浓度为350 g/m3的粉尘颗粒在球体内能保持一定的稳定状态,60 ms左右扩散达到相对均匀状态。爆炸后,燃烧最高温度为2 060 K,未燃区温度由300 K上升至375 K。粒径为26 μm的煤粉尘云爆炸危险性等级为Ⅱ级,粒径为73和115 μm的煤粉尘云爆炸危险性等级为Ⅰ级。

关键词: 粉尘粒径, 爆炸压力, 点火延迟, 数值计算, 湍流

Abstract: To analyze the explosion characteristics of coal dust, the effects of particle size and concentration of coal on the maximum explosion pressure , explosion index were investigated by using a 20 L explosive ball test device and the Fluent software. The results show that in the experimental environment 293-303 K,when the ignition energy is 10 kJ,with the increase of dust concentration, the maximum explosion pressures of three different clouds of coal dust, particle sizes of which are 26,73 and 115 μm respectively, rise first and drop afterwards , reaching their maxima at 350 g/m3, that at the same dust concentration, the maximum explosion pressure and the explosion index all increase with the decrease of the particle size , that the particle size of 26 μm, concentration of 350 g/m3 coal dust can maintain a relatively stable state during the period of 60-120 ms,and the diffusion reaches a relatively uniform state in around 60 ms ,that after the explosion, the highest temperature in the combustion zone reached 2 060 K, and the unburned area temperature increased from 300 K to 375 K, and that 26 μm dust cloud explosion hazard is rated gradeⅡ,73 and 115μm dust clouds explosion hazards are rated gradeⅠ.

Key words: dust particle size, explosion pressure, ignition delay, numerical simulation, turbulence

中图分类号: