尿素抑制甲烷爆炸过程中爆炸压力与自由基变化耦合分析

李孝斌; 张瑞杰; 崔沥巍; 张庆利

doi:10.11883/bzycj-2019-0090

尿素抑制甲烷爆炸过程中爆炸压力与自由基变化耦合分析

doi: 10.11883/bzycj-2019-0090

1.
中国人民警察大学消防工程系，河北廊坊 065000
2.
陕西省安康市消防支队，陕西安康 725700
3.
中国人民警察大学研究生部，河北廊坊 065000
4.
中国人民警察大学消防指挥系，河北廊坊 065000

基金项目: 国家自然科学基金（51774296）

详细信息

作者简介:
李孝斌（1980－　），男，博士，副教授，wjxy_lxb@163.com

中图分类号: O381; TD712.71
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- 被引次数: 0
出版历程
- 收稿日期: 2019-03-26
- 修回日期: 2019-09-30
- 刊出日期: 2020-03-01

Coupling analysis of explosion pressure and free radical change during methane explosion inhibited by urea

1.
Department of Fire Protection Engineering, China People’s Police University, Langfang 065000, Hebei, China
2.
Ankang City Fire Department of Shaanxi Province, Ankang 725700, Shaanxi, China
3.
Graduate Department, China People’s Police University, Langfang 065000, Hebei, China
4.
Department of Fire Commanding, China People’s Police University, Langfang 065000, Hebei, China

摘要

摘要: 为建立抑爆过程中，尿素对甲烷宏观抑爆效果与微观抑爆机理之间的联系，利用20 L球型爆炸测试装置开展实验，测量了尿素粉体抑制甲烷爆炸过程中爆炸压力，利用光栅光谱仪采集火焰发射光谱数据；采用光谱分析和数据同步分析方法，分析该抑爆过程中爆炸压力和NO、CN、CHO、HNO、OH等关键自由基或分子的变化，得出甲烷爆炸压力发展过程与相关自由基含量之间的耦合变化关系。研究表明，加入尿素能有效地降低甲烷的爆炸压力，延长甲烷的爆炸感应期；在尿素的作用条件，NO、HNO含量的升高和CN、CHO、OH含量的降低，可以抑制甲烷爆炸；NO、CN、CHO、HNO自由基分子与甲烷爆炸升压过程有较大联系；OH自由基一直存在于甲烷爆炸的整个过程中且含量较高；对以上自由基的干预，可以在相应阶段发挥抑爆作用。
- 甲烷爆炸 /
- 抑爆 /
- 尿素 /
- 爆炸压力 /
- 自由基 /
- 光谱分析 /
- 耦合分析
Abstract: In order to establish the link between macroscopic explosion suppression effect and the mechanism of microscopic explosion suppression during the methane explosion suppression process, we used the 20 L spherical explosion test devices and grating spectrometer to collect data on the pressure and flame emission spectrum, analyzed changes of some key free radicals or molecules such as NO, CN, CHO, HNO and OH with the methods of spectrum analysis and data synchronization analysis during the suppression of methane explosion, and obtained the coupling relationship between the development of methane explosion pressure and related free radicals’ content. The research suggests that adding urea can effectively reduce the explosion pressure of methane and extend the explosion induction period of methane. Under urea conditions, the contents of NO and HNO increase while those of CN, CHO and OH are reduced, which lead to the suppression of methane explosion; NO radicals are mainly produced during the stage of pressure increase. CN, CHO, and HNO radicals are mainly produced and peaked during the explosion induction period before pressure rises; OH radicals have always existed throughout the methane explosion and are high in content. The interference on the free radicals above can suppress the methane explosion in relevant reaction stages.
- methane explosion /
- explosion suppression /
- urea /
- explosion pressure /
- free radical /
- spectral analysis /
- coupling analysis

HTML全文

图 1 实验设备示意图

Figure 1. Experiment device

下载: 全尺寸图片幻灯片

图 2 甲烷爆炸压力与光谱时间分析耦合图

Figure 2. Time coupling analysis plot of methane explosion spectra and pressure

下载: 全尺寸图片幻灯片

图 3 尿素作用下甲烷爆炸压力与NO耦合变化关系

Figure 3. The coupling relationship plots of methane explosion pressure and the content of NO under urea condition

下载: 全尺寸图片幻灯片

图 4 尿素作用下甲烷爆炸压力与CN耦合变化关系

Figure 4. The coupling relationship plots of methane explosion pressure and the content of CN under urea condition

下载: 全尺寸图片幻灯片

图 5 尿素作用下甲烷爆炸压力与CHO耦合变化关系

Figure 5. The coupling relationship plots of methane explosion pressure and the content of CHO under urea condition

下载: 全尺寸图片幻灯片

图 6 尿素作用下甲烷爆炸压力与HNO耦合变化关系

Figure 6. The coupling relationship plots of methane explosion pressure and the content of HNO under urea condition

下载: 全尺寸图片幻灯片

图 7 尿素作用下甲烷爆炸压力与OH自由基耦合关系

Figure 7. The coupling relationship plots of methane explosion pressure and the content of OH under urea condition

下载: 全尺寸图片幻灯片

图 8 甲烷爆炸反应简化机理图

Figure 8. The reduced chemical mechanism of methane explosion

下载: 全尺寸图片幻灯片

表 1 实验方案详细表

Table 1. Testing program

光源	点火能量/ J	光栅光谱仪拍摄波段/nm	甲烷体积分数/ %	粉体浓度/ (mg∙L⁻¹)	实验组数	用途
甲烷爆炸	10	187～537 537～887 887～1 210	10	0	各3组	甲烷爆炸光谱及压力数据采集
金属丝点火	10	187～537 537～887 887～1 210	0	0	各3组	剔除点火丝火焰对光谱数据的影响
尿素抑爆火焰	10	187～537 537～887 887～1 210	10	10/20/30/40/50	各3组	尿素粉体抑爆火焰光谱及压力数据采集

下载: 导出CSV

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