中国安全科学学报 ›› 2017, Vol. 27 ›› Issue (4): 72-76.doi: 10.16265/j.cnki.issn1003-3033.2017.04.013

• 安全工程技术科学 • 上一篇    下一篇

管内煤粉爆炸特性及抑制技术研究

李小东 副教授, 师峥   

  1. 中北大学 化工与环境学院,山西 太原 030051
  • 收稿日期:2016-12-02 修回日期:2017-02-25 发布日期:2020-11-22
  • 作者简介:李小东 (1978—),男,辽宁昌图人,工学博士,副教授,硕士生导师,主要从事安全技术及工程的教学和科研工作,主要研究方向为气体、粉尘爆炸技术。E-mail:xdlinuc@126.com。

Explosion characteristics of coal dust in a tube and suppressing techniques

LI Xiaodong, SHI Zheng   

  1. College of Chemical Engineering & Environment, North University of China, Taiyuan Shanxi 030051, China
  • Received:2016-12-02 Revised:2017-02-25 Published:2020-11-22

摘要: 为更好地预防煤粉爆炸事故,利用大型水平粉尘爆炸试验管道系统开展试验,探讨煤粉粒度和挥发分含量对爆炸峰值超压的影响,选取ABC粉、CaCO3粉和SiO2粉等3种粉尘抑爆剂,分析抑爆剂种类、浓度和粒度等因素对煤尘爆炸抑制效果的影响。结果表明,煤粉粒度以及挥发分含量对爆炸峰值超压的影响程度随着煤粉质量浓度的增加逐渐减弱。试验所用3种粉尘抑爆剂的抑爆效果由高到低依次为ABC粉,SiO2粉和CaCO3粉。就ABC粉抑爆剂而言,平均粒径越小抑爆效果越好,且只有当其质量浓度超过920 g/m3时,才能完全抑制爆炸波,否则穿越抑爆区后将会重新成长。

关键词: 煤粉爆炸, 粉尘粒径, 超压, 抑爆, 管道

Abstract: To understand and prevent the explosion accidents of coal dust, experiments were carried out by using a large-scale horizontal combustion tube. Influences of both particle size and volatile content of coal dust on the explosion overpressure were investigate. ABC powder, CaCO3 rock dust powder and SiO2 powder were taken as the suppressing agents. The effects of kind, concentration and particle size of suppressing agents on explosion suppression were studied. The experimental results show that the influences of coal dust particle size and volatile content on explosion overpressure gradually diminish with the increasing of coal dust concentration,that for coal dust explosion suppression, the effect order is ABC powder, SiO2 and CaCO3 powder,that for ABC powder, the smaller the average particle sizes are, the better the suppressing effects will be,and that only when the concentrations of suppressing agents are enough high, and more than 920 g/m3, can complete explosion suppression be achieved, otherwise, the explosion wave would newly develop through the explosion suppression zone.

Key words: coal dust explosions, dust particle size, overpressure, explosion suppression, tube

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