超细二氧化硅粉体对淀粉火焰抑制的实验研究

黄楚原; 陈先锋; 张洪铭; 唐文文; 陈曦; 张文博; 刘晅亚

doi:10.11883/bzycj-2016-0235

超细二氧化硅粉体对淀粉火焰抑制的实验研究

doi: 10.11883/bzycj-2016-0235

黄楚原^{1, 2},
陈先锋^1, ,,
张洪铭¹,
唐文文¹,
陈曦¹,
张文博¹,
刘晅亚²

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:

国家重点研发计划项目 2016YFC0802801

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 2017IVA040

详细信息

作者简介:
黄楚原(1991-)，男，硕士研究生

通讯作者:
陈先锋，cxf618@whut.edu.cn

中图分类号: O389
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- 文章访问数: 5676
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- 被引次数: 0
出版历程
- 收稿日期: 2016-08-16
- 修回日期: 2017-02-14
- 刊出日期: 2018-03-25

Experimental investigation on suppression of starch flame by ultrafine silicon dioxide powders

1.
School of Resources and 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: 为了探究不同粒径二氧化硅粉体抑制效果上的差异，采用小尺寸竖直燃烧管道系统，研究添加10 μm和30 nm二氧化硅粉体时，不同粒径小麦淀粉燃烧的火焰传播、温度、速度等参数特性的变化。实验结果表明：超细二氧化硅粉体能减弱小麦淀粉燃烧反应强度；30 nm二氧化硅粉体抑制效果优于10 μm二氧化硅，当小麦淀粉粒径小于25 μm时，质量浓度为0.43 kg/m³、粒径30 nm的超细二氧化硅粉体可使小麦淀粉火焰亮度明显下降，最高温度下降38.07%，最大速度和平均速度分别下降42.25%、65.59%；超细二氧化硅粉体主要起物理抑制作用，抑制效果与小麦粒径成反比关系，小麦粒径越小，二氧化硅抑制效果越好。
- 超细粉体 /
- 粉尘燃烧 /
- 火焰传播 /
- 惰化抑制
Abstract: It is well known that the ultrafine silicon dioxide powder has a certain suppressing effect on the wheat starch flame. In this work, we explore the difference in this effect on the silicon dioxide powder due to different particle sizes, the changes of flame propagation, temperature, velocity and other parameters of the wheat starch combustion by adding 10 μm and 30 nm silicon dioxide powders. The experimental results show that the ultrafine silicon dioxide powder can reduce the wheat starch's burning reaction strength. The 30 nm powder produces a more effective suppression than the 10 μm powder. When the wheat starch powder's particle size is below 25 μm, The ultra fine powders with a mass concentration of 0.43 kg/m³ and a grain size of 30 nm can significantly decrease the wheat starch's flame brightness, reducing its maximum temperature by 38.07%, its maximum and average velocities by 42.25% and 65.59%, respectively. The ultrafine silicon dioxide exerts mainly an effect of physical suppression, which is inversely proportional to the particle size of wheat starch grains. The smaller the wheat starch grain size, the better the effect of silicon dioxide suppression.
- ultrafine powder /
- dust combustion /
- flame propagation /
- inertia and suppression

HTML全文

图 1 实验装置示意图

Figure 1. Schematic diagram of experimental device

下载: 全尺寸图片幻灯片

图 2 粉尘云火焰高速摄影图像

Figure 2. High speed photographic images of dust cloud flame

下载: 全尺寸图片幻灯片

图 3 小麦淀粉粉尘云火焰温度

Figure 3. Dust cloud flame temperature of wheat starch

下载: 全尺寸图片幻灯片

图 4 加入抑制剂后小麦淀粉粉尘云温度变化

Figure 4. Temperature change of wheat starch dust cloud after adding inhibitors

下载: 全尺寸图片幻灯片

图 5 小麦淀粉粉尘云火焰前锋速度

Figure 5. Dust cloud flame front velocity of wheat starch

下载: 全尺寸图片幻灯片

图 6 小麦淀粉粉尘云火焰速度

Figure 6. Dust cloud flame speed of wheat starch

下载: 全尺寸图片幻灯片

表 1 小麦样品筛出粒径

Table 1. Particle size of the wheat sample screened

序号	筛分规格/目	粒径范围/μm
1	200~300	48~75
2	300~400	38~48
3	400~500	25~38
4	500以上	0~25

下载: 导出CSV

表 2 实验工况

Table 2. Experimental condition

工况	小麦淀粉粒径/μm	二氧化硅粒径/μm
1	48~75
2	48~75	10
3	48~75	0.03
4	38~48
5	38~48	10
6	38~48	0.03
7	25~38
8	25~38	10
9	25~38	0.03
10	0~25
11	0~25	10
12	0~25	0.03

下载: 导出CSV

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