点火延迟时间对CO2-超细水雾的抑爆特性影响

doi:10.11949/0438-1157.20221224

化工学报 ›› 2022, Vol. 73 ›› Issue (12): 5672-5684.DOI: 10.11949/0438-1157.20221224

• 过程安全 • 上一篇

点火延迟时间对CO₂-超细水雾的抑爆特性影响

裴蓓¹(), 康亚祥¹, 余明高²(), 郭佳琪¹, 韦双明¹, 陈立伟¹

^1.河南理工大学，煤炭安全生产与清洁高效利用省部共建协同创新中心，河南焦作 454003
^2.重庆大学，煤矿灾害动力学与控制国家重点实验室，重庆 400044

收稿日期:2022-09-07 修回日期:2022-10-31 出版日期:2022-12-05 发布日期:2023-01-17
通讯作者: 余明高
作者简介:裴蓓（1982—），女，博士，副教授，smart128@126.com
基金资助:
河南省高校科技创新人才支持计划项目(22HASTIT027);河南省科技攻关研究项目(212102310006);中国博士后科学基金特别资助项目(2019T120622);河南省高校基本科研业务费专项(NSFRF210344)

Effect of ignition delay time on explosion suppression characteristics of CO₂-ultra-fine water mist

Bei PEI¹(), Yaxiang KANG¹, Minggao YU²(), Jiaqi GUO¹, Shuangming WEI¹, Liwei CHEN¹

^1.Collaborative Innovation Center of Coal Safety Production and Clean and Efficient Utilization, Henan Polytechnic University, Jiaozuo 454003, Henan, China
^2.State Key Laboratory of Coal Mine Disaster Dynamics and Control, Chongqing University, Chongqing 400044, China

Received:2022-09-07 Revised:2022-10-31 Online:2022-12-05 Published:2023-01-17
Contact: Minggao YU

摘要/Abstract

摘要：

利用20 L球爆炸实验平台，系统研究了不同点火延迟时间对CO₂-超细水雾抑制瓦斯/煤尘爆炸特性的影响。结果表明：相比单一抑爆，在CO₂-超细水雾作用下，随着点火延迟时间延长和水雾浓度增大，瓦斯/煤尘爆炸强度削弱，火焰传播速度降低，火焰亮度降低且出现下沉现象，火焰内部煤尘粒子运动状态由向心运动向旋转运动转换。10%CO₂、306 g/m³超细水雾时，在1500 ms点火延迟时的最大爆炸压力和最大压力上升速率比无水雾时分别降低了6.79%和16.14%，最大爆炸压力来临时间延长了24.47%；10%CO₂、204 g/m³超细水雾下，在2000 ms点火延迟时的最大爆炸压力和火焰平均速度比1000 ms点火延迟时分别降低了5.22%和37.5%，最大爆炸压力来临时间延长24.66%。研究结果为气液两相抑爆剂抑制瓦斯/煤尘爆炸控制参数的确定提供了技术指导。

关键词: 点火延迟时间, CO₂, 超细水雾, 瓦斯/煤尘, 抑爆

Abstract:

In order to study the influence of ignition delay time on the characteristics of CO₂-ultra-fine water mist suppression of gas/coal dust explosion, different concentrations of ultra-fine water mist and CO₂ were introduced into 20 L ball through a self-made ultra-fine water mist generator, and the explosion pressure, flame propagation velocity, flame structure and explosion flow field turbulence images of gas/coal dust under different ignition delay time were obtained. The research results show that compared with single explosion suppression, under the action of CO₂-ultra-fine water mist, with the extension of ignition delay time and the increase of water mist concentration, the explosion intensity of gas/coal dust is weakened and the flame propagation speed is reduced. For 10%CO₂ and 306 g/m³ ultra-fine water mist, the maximum explosion pressure and pressure rise rate at 1500 ms ignition delay are reduced by 6.79% and 16.14% respectively compared with those without water mist, and the arrival time of maximum explosion pressure is extended by 24.47%. Under 10%CO₂ and 204 g/m³ ultra-fine water mist, the maximum explosion pressure and average flame speed at 2000 ms ignition delay are reduced by 5.22% and 37.5% respectively compared with 1000 ms ignition delay, and the arrival time of maximum explosion pressure is extended by 24.66%. It can be seen from the explosion flame schlieren image and PIV test that with the increase of water mist concentration and the extension of ignition delay time, the flame brightness decreases and sinks, and the motion state of coal dust particles in the flame changes from centripetal motion to rotational motion. This is because the initial intensity of gas explosion under the action of CO₂ inerting decreases, while the concentration of water mist increases, the energy consumed by water mist endothermic evaporation increases during the explosion process, and the generated water vapor dilutes the oxygen concentration around the flame, further inhibiting the explosion reaction. Prolonging the ignition delay time strengthens the influence of water mist on the movement of pulverized coal, reduces the agglomeration and dispersion of coal dust, weakens the turbulent effect of coal dust cloud, suppresses the combustion and explosion of coal dust clouds, and finally reduces the explosion intensity of gas/coal dust. The research results provide technical guidance for the determination of control parameters of gas/coal dust explosion suppression by gas-liquid two-phase detonation inhibitor.

Key words: ignition delay time, CO₂, ultra-fine water mist, gas/coal dust, explosion suppression

中图分类号:

TD 712

裴蓓, 康亚祥, 余明高, 郭佳琪, 韦双明, 陈立伟. 点火延迟时间对CO₂-超细水雾的抑爆特性影响[J]. 化工学报, 2022, 73(12): 5672-5684.

Bei PEI, Yaxiang KANG, Minggao YU, Jiaqi GUO, Shuangming WEI, Liwei CHEN. Effect of ignition delay time on explosion suppression characteristics of CO₂-ultra-fine water mist[J]. CIESC Journal, 2022, 73(12): 5672-5684.

图/表 18

图1 实验系统

Fig.1 Experimental system

表1 煤尘工业分析

Table 1 Industrial analysis of coal dust

煤样

水分/%

(质量)

灰分/%

(质量)

挥发分/%

(质量)

固定碳/%

(质量)

图2 煤尘粒径分布

Fig.2 Particle size distributions of coal dust

图3 不同点火延迟时间的瓦斯/煤尘爆炸压力曲线和压升速率曲线（0%CO2+0 g/m3 H2O）

Fig.3 Gas/coal dust explosion pressure curve and pressure rise rate curve with different ignition delay time（0%CO2+0 g/m3H2O）

图4 不同点火延迟时间的瓦斯/煤尘爆炸压力曲线和压升速率曲线（10%CO2+204 g/m3H2O）

Fig.4 Gas/coal dust explosion pressure curve and pressure rise rate curve with different ignition delay time（10%CO2+204 g/m3H2O）

图5 不同浓度超细水雾作用下的瓦斯/煤尘爆炸压力曲线和压升速率曲线(10%CO2+1500 ms)

Fig.5 Gas/coal dust explosion pressure curve and pressure rise rate curve under the action of different concentrations of ultra-fine water mist (10%CO2+1500 ms)

图6 不同体积分数CO2作用时的压力曲线和压力上升速率曲线（204 g/m3H2O+1500 ms）

Fig.6 Gas/coal dust explosion pressure curve and pressure rise rate curve under the action of different volume fraction of CO2（204 g/m3H2O+1500 ms）

图7 不同浓度超细水雾作用下Pmax随点火延迟时间的变化曲线（10%CO2）

Fig.7 Pmaxcurve with ignition delay time under different concentrations of ultra-fine water mist （10%CO2）

图8 不同点火延迟时间的v-r和r-t曲线(0%CO2+0 g/m3H2O)

Fig.8 v-r and r-t curves of different ignition delay time (0%CO2+0 g/m3H2O)

图9 不同点火延迟时间下v-r和r-t曲线(6%CO2+204 g/m3H2O)

Fig.9 v-r and r-t curves of different ignition delay time (6%CO2+204 g/m3H2O)

图10 不同浓度的超细水雾作用下的v-r和r-t曲线（6%CO2+1500 ms）

Fig.10 v-r and r-t curves under the action of different concentrations of ultra-fine water mist（6%CO2+1500 ms）

图11 不同浓度超细水雾作用下火焰平均速度随点火延迟时间的变化曲线(6%CO2)

Fig.11 Curve of flame average velocity changing with ignition delay time under the action of different concentrations of ultra-fine water mist （6%CO2）

图12 不同CO2浓度作用下火焰平均速度随点火延迟时间的变化曲线(204 g/m3H2O)

Fig.12 Curve of flame average velocity changing with ignition delay time under the action of different concentrations of ultra-fine water mist （204 g/m3H2O）

图13 不同点火延迟时间下瓦斯/煤尘爆炸纹影图像(6%CO2+204 g/m3H2O)

Fig.13 Schlieren image of gas/coal dust explosion at different ignition delay time(6%CO2+204 g/m3H2O)

图14 不同浓度超细水雾下瓦斯/煤尘爆炸纹影图像（6%CO2+1500 ms）

Fig.14 Schlieren image of gas/coal dust explosion under different concentrations of ultra-fine water mist（6%CO2+1500 ms）

图15 不同条件CO2和超细水雾作用下的瓦斯/煤尘爆炸纹影图像(1500 ms)

Fig.15 Schlieren image of gas/coal dust explosion under different conditions of CO2 and ultra-fine water mist（1500 ms）

图16 不同点火延迟时间下瓦斯/煤尘爆炸流场图(0%CO2+306 g/m3H2O)

Fig.16 Flow field diagram of gas/coal dust explosion at different ignition delay time (0%CO2+306 g/m3H2O)

图17 不同浓度超细水雾下瓦斯/煤尘爆炸流场图（10%CO2+1500 ms）

Fig.17 Flow field diagram of gas/coal dust explosion under different concentrations of ultra-fine water mist（10%CO2+1500 ms）

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点火延迟时间对CO₂-超细水雾的抑爆特性影响

Effect of ignition delay time on explosion suppression characteristics of CO₂-ultra-fine water mist

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