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 ›› 2020, Vol. 39 ›› Issue (5): 596-600.

• • 上一篇    下一篇

浓度对垂直独头管道玉米淀粉火焰传播的影响

杨凯1,2，陈彦斌1，庞磊1,2，张志文1，任佳奇1，李思刚1，刘文帅1   

  1. 1.北京石油化工学院，北京 102617； 2.北京市安全生产工程技术研究院，北京 102617
  • 出版日期:2020-05-15 发布日期:2020-05-15
  • 通讯作者: 刘文帅（1995-），男，北京石油化工学院安全工程学院。
  • 作者简介:杨 凯（1986-），男，北京石油化工学院安全工程学院讲师，博士，主要从事粉尘爆炸方面的研究，北京市大兴区清源北路19号，102617。
  • 基金资助:
    北京市科技新星计划项目（Z181100006218092）；北京市优秀人才培养资助青年拔尖个人项目（2016000026833ZK05）；北京市大学生研究训练[URT]计划项目（2019X00008）

Effect of concentration on flame propagation of corn starch in vertical half-open pipe

YANG Kai1,2， CHEN Yan-bin1， PANG Lei1,2，ZHANG Zhi-wen1， REN Jia-qi1， LI Si-gang1，LIU Wen-shuai1   

  1. 1.School of Safety Engineering, Beijing Institute of Petrochemical Technology, Beijing 102617, China； 2. Beijing Academy of  Safety  Engineering  and  Technology, Beijing 102617, China
  • Online:2020-05-15 Published:2020-05-15

摘要： 选择真空干燥后的食品级玉米淀粉，利用激光粒度分析仪和扫描电镜分析颗粒的形状和几何尺寸。利用高速摄像机技术，在1.2 m长的垂直独头管道内对玉米淀粉粉尘云的爆炸火焰传播行为进行实验研究，考察有、无障碍物的条件下粉尘云浓度对火焰传播的影响。结果表明：火焰整体上呈先增加再降低的发展趋势。粉尘云浓度和障碍物均对玉米淀粉粉尘云火焰传播形态及火焰速度具有显著影响。随粉尘云浓度增加，粉尘燃烧不充分，导致出现最大火焰速度和火焰亮度均逐渐降低，火焰轮廓不清晰,火焰分段等现象。障碍物的湍流效应会加速粉尘燃烧，增加粉尘火焰传播速度，提高火焰亮度和轮廓清晰度，但粉尘云浓度增加会降低障碍物对火焰传播的加速效应，促使最大火焰速度呈先增加再降低的趋势。

关键词: 玉米淀粉, 粉尘云浓度, 火焰速度, 障碍物, 火焰传播形态

Abstract: Taking food grade corn starch after vacuum drying as example, particle shape and size were analyzed by laser particle size analyzer and SEM. High speed camera technology was used to study explosive flame propagation behavior of corn starch dust cloud in a 1.2 m long vertical half-open tube, and the influence of dust cloud concentration on flame propagation with or without obstacle was investigated. The results showed that the flame speed overall increases at first and then decreases. Both dust cloud concentration and obstacle have significant influence on the flame propagation pattern and flame speed of corn starch dust cloud. With the increase of dust cloud concentration, the dust combustion is not sufficient, resulting in the gradual decrease of the maximum flame speed and flame brightness and unclear flame contour and flame segment phenomenon. The turbulence effect of obstacles will accelerate the combustion of dust, increase the speed of dust flame propagation, improve the flame brightness and contour clarity. However, an increase in the concentration of dust clouds will reduce the accelerated effect of obstacles on flame propagation, and promote the maximum flame speed to increase at first and then decrease.

Key words: corn starch, dust cloud concentration, flame velocity, obstacle, flame propagation pattern