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《郑州大学学报(工学版)》[ISSN:1671-6833/CN:41-1339/T]

卷:

43

期数:

2022年03期

页码:

81-86

栏目:

出版日期:

2022-04-10

文章信息/Info

Title:

Study on Synergistic Fire Extinguishing Effect of NaHCO3 and Typical Gas

作者:

梁天水; 张俊格; 毛思远; 张华杰

郑州大学力学与安全工程学院;

Author(s):

LIANG Tianshui;  ZHANG Junge;  MAO Siyuan;  ZHANG Huajie

School of Mechanics and Safety, Zhengzhou University, Zhengzhou 450001, China

关键词:

协同灭火; NaHCO_3粉体; 惰性气体; 协同因子

Keywords:

synergistic fire extinguishing effect;  NaHCO3 powder;  inert gas;  cofactor

分类号:

TQ569

DOI:

10.13705/j.issn.1671-6833.2022.03.010

文献标志码:

A

摘要:

为了探究不同粒径 NaHCO3 粉体的灭火效果,对比其与不同典型气体灭火剂之间 的协 同灭火效果,获得协同效果最佳的气固比例,为气固协同灭火相关研究提供数据支持。以 4、10、48 μm 3 种不同粒径的 NaHCO3 粉体为研究对象，采用电子扫描电镜观察不同粒径的 NaHCO3 粉体，确定粉体颗粒均匀分布的状态，基于杯式燃烧器装置开展熄灭甲烷火焰实验，根据实验结果分析粒径大小对粉体灭火作用的影响，选择出灭火效果最好的 4 μm NaHCO3 粉体与典型气体灭火剂 CO2 、N2 、He、Ar 进行气固协同实验，获取 NaHCO3 粉体在不同典型气体灭火剂浓度下的临界灭火浓度，从而计算协同因子定量评价气固的协同灭火效果，选择协同效果最佳的气固比例及典型气体灭火剂。实验结果表明：粉体平均粒径越小，灭火效果越好， 灭火 效能排序为 4 μm Na HCO 3 >10 μm NaHCO3 >48 μm NaHCO3 ，4 μm NaHCO3 粉体的灭火效能约是 10 μm NaHCO3 的 2.2 倍4 μm NaHCO3 粉体与气体灭火剂均有一定的正协同效果，随着气体灭火剂体积分数的增加，NaHCO3 粉体的临界灭火浓度均有下降，且在不同气体灭火剂氛围下，临界 灭 火浓度下降趋势有一定的相似性。当 CO2 、N2 、He、Ar 体积分数为 7.1%、6.4%、8.5%、10.1%时，与 4 μm NaHCO3 粉体的协同效果达到峰值，对应协同因子为 0.58、0.62、0.69、0.764 种典型气体中， CO2 的协 同效果最 好。

Abstract:

This study aimed to explore the fire extinguishing effect of different particle size NaHCO3 powder, to compare the synergistic fire extinguishing effect between it and different typical gas fire extinguishing agents, to obtain the best gas-solid ratio of synergistic effect, and to provide data support for the research of gas-solid synergistic fire extinguishing.Taking 4 μm, 10 μm, and 48 μm NaHCO3 powders with three different particle sizes as the research object, according to the scanning electron microscope observation of different particle sizes of NaHCO3, the uniform distribution of the powder particles was determined, and the extinguishing was carried out based on the cup burner device.In the methane flame experiment, the influence of the particle size on the powder fire extinguishing effect was analyzed according to the critical fire extinguishing concentration relationship obtained from the experiment, and the 4 μm NaHCO3 powder with the best fire extinguishing effect was selected and the typical gas fire extinguishing agent CO2, N2, He, Ar was used for gas solid-solid synergy experiment to obtain the critical fire-extinguishing concentration of NaHCO3 powder at different typical gas fire extinguishing agent concentrations, so as to calculate the synergy factor to quantitatively evaluate the gas-solid synergistic fire extinguishing effect, and select the gas-solid ratio and typical gas fire extinguishing agent with the best synergistic effect.Experimental results showed that the smaller the average particle size of the powder, the better the fire extinguishing effect.The order of fire extinguishing efficiency was 4 μm NaHCO3 >10 μm NaHCO3 >48 μm NaHCO3.The fire extinguishing efficiency of 4 μm NaHCO3 powder was about 2.2 times of 10 μm NaHCO3; 4 μm NaHCO3 powder and gas fire extinguishing agent had a certain positive synergistic effect.With the increase of the volume fraction of gas fire extinguishing agent, the critical fire extinguishing concentration of NaHCO3 powder decreased.In the atmosphere, there was a certain similarity in the downward trend of the critical fire-extinguishing concentration.When the CO2, N2, He, and Ar gas concentrations were 7.1%, 6.4%, 8.5%, 10.1%, the synergistic effect with 4 μm NaHCO3 powder reached its peak, and the corresponding synergy factors were 0.58, 0.62, 0.69, 0.76; Among the typical gases, CO2 had the best synergistic effect.

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更新日期/Last Update: 2022-05-02