惰化剂粒径对铝粉火焰传播特性影响的实验研究

陈曦; 陈先锋; 张洪铭; 刘晅亚; 张英; 牛奕; 胡东涛

doi:10.11883/1001-1455(2017)04-0759-07

惰化剂粒径对铝粉火焰传播特性影响的实验研究

doi: 10.11883/1001-1455(2017)04-0759-07

1.
武汉理工大学资源与环境工程学院，湖北武汉 430070
2.
建筑消防工程技术公安部重点实验室，天津 300381

基金项目:

国家自然科学基金项目 51174153

国家自然科学基金项目 51374164

建筑消防工程技术公安部重点实验室开放课题 KFKT2014ZD03

中央高校基本科研业务费专项资金项目 2015-zy-080

详细信息

作者简介:
陈曦(1990-)，男，硕士研究生

通讯作者:
陈先锋，cxf618@whut.edu.cn

中图分类号: O381
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- 被引次数: 0
出版历程
- 收稿日期: 2015-11-24
- 修回日期: 2016-05-03
- 刊出日期: 2017-07-25

Effects of inerting agent with different particle sizes onthe flame propagation of aluminum dust

1.
School of Resources & Environmental Engineering, Wuhan University of Technology, Wuhan 430070, Hubei, China
2.
Key Laboratory of Building Fire Protection Engineering and Technology of MPS, Tianjin 300381, China

摘要

摘要: 为探索惰化剂粒径对可燃工业粉尘火焰传播特性的影响，通过建立竖直粉尘燃烧管道实验平台，在碳酸氢钠质量分数为30%的惰化条件下，就碳酸氢钠粒径对铝粉燃烧火焰传播特性的影响进行了实验研究。结果表明：平均粒径为30 μm的碳酸氢钠粉体对平均粒径为15 μm的铝粉的火焰传播速度具有较好的抑制作用，惰性粉体与可燃工业粉尘应存在粒度匹配效应；碳酸氢钠粉体对铝粉火焰温度的惰化抑制效果与其粒径呈反比关系；碳酸氢钠粉体会减小铝粉火焰预热区厚度，预热区厚度随碳酸氢钠粒径的增加先减小后增大。此外，分析了碳酸氢钠粒径对铝粉火焰传播特性影响的作用机理。
- 惰化剂 /
- 粒径 /
- 铝粉 /
- 燃烧 /
- 火焰传播
Abstract: To explore the influence of the inerting agent with different particle sizes on the flame propagation of the combustible industrial dust, by establishing a vertical dust combustion pipe experiment platform, we investigated the effects of the particle size of sodium bicarbonate on the characteristics of the burning flame propagation of aluminum powder. The results show that, under the condition of 30% mass fraction of sodium bicarbonate, the sodium bicarbonate powder with an average particle size of 30 μm has a good inhibitory effect on the flame propagation speed of aluminum powder with an average particle size of 15 μm, and there exists a correlation between the particle size of the inerting powder and the combustible industrial dust. The inerting inhibiting effect of sodium bicarbonate powder on the flame temperature of aluminum is inversely proportionate to its particle size. It was found that sodium bicarbonate powder can decrease the thickness of the preheating zone of aluminum powder flame, which decreases at first and then increases with the increase of the particle size of the sodium bicarbonate. Finally, we also examined the mechanism underlying the influence of sodium bicarbonate particle size on the flame propagation of aluminum powder.
- inerting agent /
- particle size /
- aluminum powder /
- burning /
- flame propagation

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图 1 实验系统结构

Figure 1. Scheme of experimental system

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图 2 铝粉火焰传播过程

Figure 2. The flame propagation process of aluminum powder

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图 3 铝粉火焰传播图像截图

Figure 3. Partial image of the aluminumpowder flame propagation

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图 4 铝粉火焰结构示意图

Figure 4. Structure of the aluminum powder flame

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图 5 不同工况下铝粉火焰传播速度

Figure 5. Flame propagation speeds under different conditions

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图 6 不同工况下铝粉火焰温度变化

Figure 6. Flame temperature variations under different conditions

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图 7 碳酸氢钠粒径对铝粉火焰形态的影响

Figure 7. Influence of sodium bicarbonate particle size on flame formation

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图 8 不同工况下铝粉火焰预热区厚度

Figure 8. Flame thickness of the preheating zone under different conditions

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表 1 实验样品参数

Table 1. Specific parameters of the sample

样品名称	分子式	相对分子质量	纯度/%	级别	实验用量/g
铝粉	Al	26.98	99.0	分析纯	0.9
碳酸氢钠	NaHCO₃	84.01	99.5	分析纯	0.4

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