Numerical simulation of CO2 injection for fire prevention in a goaf affected by normal fault influence

doi:10.16265/j.cnki.issn1003-3033.2025.04.1231

Abstract

Abstract:

To address the issue of natural coal ignition in goaf under normal fault geological structures, the oxygen consumption rate and heat release intensity of coal samples were measured using a temperature-programmed oxidation device. Based on a porous media model of the goaf and the gas component transport equation, a numerical model for CO₂ injection via side pressure into the goaf influenced by normal faults was established. The numerical model was used to simulate the mechanism by which the variation in the distance between the working face and the fault affects the width of spontaneous combustion oxidation band in the goaf, and analyze gas migration characteristics under different CO₂ injection locations and flow rates. The results indicate that as the distance between the working face and the fault increases, the width of the oxidation band initially increases and then decreases, reaching a maximum width at 70 m from the fault. With the increase of CO₂ injection depth, the oxidation band width initially decreases and then increases again, reaching a minimum width when the CO₂ injection position is 40 m from the working face. Furthermore, with the increase of CO₂ injection volume, the width of the oxidation band width decreases following a negative exponential trend. When the CO₂ injection rate is 1000m³/h and CO₂ volume fraction at the working face is below 0.4% for safety, width of the oxidation band reaches its minimum.

Key words: goaf, normal fault, CO₂ fire prevention, numerical simulation, coal spontaneous combustion, oxidation band width

CLC Number:

X928.7火灾与爆炸事故

ZHANG Jiayong, LYU Zuxin, CUI Xiao, GUO Liwen, WU Jianguo, FU Jingbin. Numerical simulation of CO₂ injection for fire prevention in a goaf affected by normal fault influence[J]. China Safety Science Journal, 2025, 35(4): 9-17.

Figures/Tables 14

Fig.1

Fig.2

Fig.3

Fig.4

Table 1

Fig.5

Fig.7

Fig.8

Fig.9

Fig.10

Fig.11

Fig.12

Fig.13

References 25

[1]	李敏, 林志军, 王德明, 等. 我国煤矿重特大火灾事故统计分析[J]. 中国安全科学学报, 2023, 33(1):115-121.
	LI Min, LIN Zhijun, WANG Deming, et al. Statistical analysis of major coal mine fire accidents in China[J]. China Safety Science Journal, 2023, 33(1):115-121.
[2]	秦波涛, 仲晓星, 王德明, 等. 煤自燃过程特性及防治技术研究进展[J]. 煤炭科学技术, 2021, 49(1):66-99.
	QIN Botao, ZHONG Xiaoxing, WANG Deming. Research progress of coal spontaneous combustion process characteristics and prevention technology[J]. Coal Science and Technology, 2021, 49(1):66-99.
[3]	王连聪, 梁运涛, 罗海珠. 我国矿井热动力灾害理论研究进展与展望[J]. 煤炭科学技术, 2018, 46(7):1-9.
	WANG Liancong, LIANG Yuntao, LUO Haizhu. Research progress and outlook on theory of thermodynamic disaster of coal mine in China[J]. Coal Science and Technology, 2018, 46(7):1-9.
[4]	谢和平, 高峰, 鞠杨, 等. 深部开采的定量界定与分析[J]. 煤炭学报, 2015, 40(1):1-10.
	XIE Heping, GAO Feng, JU Yang, et al. Quantitative definition and investigation of deep mining[J]. Journal of China Coal Society, 2015, 40(1):1-10.
[5]	CHENG Yuanping, PAN Zhejun. Reservoir properties of Chinese tectonic coal: a review[J]. Fuel, 2020, 260: DOI: 10.1016/j.fuel.2019.116350.
[6]	琚宜文, 姜波, 侯泉林, 等. 构造煤结构-成因新分类及其地质意义[J]. 煤炭学报, 2004, 29(5):513-517.
	JU Yiwen, JIANG Bo, HOU Quanlin, et al. The new structure-genetic classification system in tectonically deformed coals and its geological significance[J]. Journal of China Coal Society, 2004, 29(5):513-517.
[7]	郭晓洁. 构造煤的变形变质特征及其对瓦斯吸附的影响[D]. 北京: 中国矿业大学(北京), 2020.
	GUO Xiaojie. Deformation and metamorphism characteristics of deformed coal and its effect on methane adsorption[D]. Beijing: China University of Mining and Technology(Beijijng), 2020.
[8]	李宗翔, 张明乾, 杨志斌, 等. 断层构造对煤结构及氧化自燃特性的影响[J]. 煤炭学报, 2023, 48(3):1246-1254.
	LI Zongxiang, ZHANG Mingqian, YANG Zhibin, et al. Effect of fault structure on the structure and oxidative spontaneous combustion characteristics of coal[J]. Journal of China Coal Society, 2023, 48(3):1246-1254.
[9]	李宗翔, 张明乾, 杨志斌, 等. FTIR和XRD在断层构造煤结构分析中的应用[J]. 光谱学与光谱分析, 2023, 43(2):657-664.
	LI Zongxiang, ZHANG Mingqian, YANG Zhibin, et al. Application of FTIR and XRD in structural analysis of fault tectonic coal[J]. Spectroscopy and Spectral Analysis, 2023, 43(2):657-664.
[10]	DONG Jun, CHENG Yuanping, JIANG Juncheng, et al. Effects of tectonism on the pore characteristics and methane diffusion coefficient of coal[J]. Arabian Journal of Geosciences, 2020, 13(12):151-168.
[11]	杨元勋, 张凌. 易自燃煤层工作面过断层期间自然发火防治技术[J]. 煤矿安全, 2017, 48(7):92-94.
	YANG Yuanxun, ZHANG Ling. Prevention and control of spontaneous combustion during the period of passing through faults in easy self-ignition coal seam[J]. Safety in Coal Mines, 2017, 48(7):92-94.
[12]	王国芝, 姜奎, 王怡, 等. 二氧化碳防灭火技术在采空区发火治理中的应用研究[J]. 金属矿山, 2021(10):214-220.
	WANG Guozhi, JIANG Kui, WANG Yi, et al. Research on application of carbon dioxide fire fighting technology in goaf fire control[J]. Metal Mine, 2021(10):214-220.
[13]	叶庆树. 二氧化碳对煤自燃特性的影响规律[J]. 煤矿安全, 2021, 52(2):43-47.
	YE Qingshu. Effect of carbon dioxide on coal spontaneous combustion characteristics[J]. Safety in Coal Mines, 2021, 52(2):43-47.
[14]	HU Jian, YAO Haifei, WANG Hang, et al. Experimental study on inhibition of spontaneous combustion of coal with different metamorphic degree by CO₂[J]. Solid Fuel Chemistry, 2024, 57(7):494-501.
[15]	李宗翔, 刘宇, 王政, 等. 九道岭矿采空区注CO₂防灭火技术数值模拟研究[J]. 煤炭科学技术, 2018, 46(9):153-157.
	LI Zongxiang, LIU Yu, WANG Zheng, et al. Study on numerical simulation of CO₂ injection fire prevention and extinguishing technique in goaf of Jiudaoling mine[J]. Coal Science and Technology, 2018, 46(9):153-157.
[16]	白刚, 令狐建设, 李耀谦, 等. 基于Box-Behnken设计的CO₂防灭火数值模拟[J]. 煤矿安全, 2023, 54(3):117-122.
	BAI Gang, LINGHU Jianshe, LI Yaoqian, et al. Numerical simulation of CO₂ fire preventing and extinguishing based on Box-Behnken design[J]. Safety in Coal Mines, 2023, 54(3):117-122.
[17]	王继仁, 张英, 郝朝瑜. 半“O”型冒落采空区注CO₂防灭火的数值模拟[J]. 中国安全科学学报, 2015, 25(7):48-54.
	WANG Jiren, ZHANG Ying, HAO Chaoyu. Numerical simulation of fire prevention in gob area with half O-ring risked falling by CO₂ injection[J]. China Safety Science Journal, 2015, 25(7):48-54.
[18]	刘垚, 王福生, 董轩萌, 等. 基于程序升温试验的煤自燃特性及微观机理研究[J]. 煤炭科学技术, 2024, 52(增1):94-106.
	LIU Yao, WANG Fusheng, DONG Xuanmeng, et al. Study on the characteristics and microscopic mechanism of coal spontaneous combustion based on programmed heating experiment[J]. Coal Science and Technology, 2024, 52(S1):94-106.
[19]	张荣刚, 解树亮. 复杂条件下煤自燃特性参数变化规律研究[J]. 煤炭工程, 2023, 55(5):130-134.
	ZHANG Ronggang, XIE Shuliang. Experimental study on coal spontaneous combustion characteristics under complex conditions[J]. Coal Engineering, 2023, 55(5):130-134.
[20]	丁徐琴, 张雷林. 氧气体积分数对煤自燃特性影响的实验研究[J]. 煤矿安全, 2023, 54(7):156-162.
	DING Xuqin, ZHANG Leilin. Experimental study on effect of oxygen volume fraction on spontaneous combustion characteristics of coal[J]. Safety in Coal Mines, 2023, 54(7):156-162.
[21]	刘宏波. 综放工作面采空区自然发火三维数值模拟研究[D]. 北京: 中国矿业大学(北京), 2012.
	LIU Hongbo. Study on three-dimensional numerical simulation of spontaneous ignition in gob of fully mechanized caving face[D]. Beijing: China University of Mining and Technology(Beijing), 2012.
[22]	朱成军, 叶青, 丁文学, 等. 多热源条件下采空区煤自燃CO分布规律研究[J]. 矿山工程, 2024, 12(1):92-102.
	ZHU Chengjun, YE Qing, DING Wenxue, et al. Research on the distribution law of coal spontaneous combustion CO in goaf under the condition of multiple heat sources[J]. Mine Engineering, 2024, 12(1):92-102.
[23]	李敏, 罗欧文, 鲁义, 等. 再生顶板条件下煤自燃危险区域空间分布特征[J]. 中国安全科学学报, 2024, 34(3):129-136.
	LI Min, LUO Ouwen, LU Yi, et al. Research on spatial distribution pattern of coal spontaneous combustion hazardous zone under condition of regenerated roof[J]. China Safety Science Journal, 2024, 34(3):129-136.
[24]	李文川. 高瓦斯矿井采空区注入CO₂防治遗留煤体自燃研究[J]. 煤炭技术, 2023, 42(1):166-170.
	LI Wenchuan. Study on prevention and control of spontaneous combustion of residual coal by injecting CO₂ into gob of high gas mine[J]. Coal Technology, 2023, 42(1):166-170.
[25]	国家安全生产监督管理总局. 煤矿安全规程[EB/OL]. (2016-02-25). https://www.mem.gov.cn/gk/zfxxgkpt/fdzdgknr/gz11/201602/t20160225_417345.shtml

名称	参数
能量	打开
湍流模型	k-ε模型
组分运输	甲烷-空气
风流入口类型	速度入口
风流出口类型	自由出口
注气口类型	速度入口
入口风量/(m^-3·s)	19.21
新鲜风流温度/℃	20
风流入口O₂体积分数/%	20.9
注入CO₂体积分数/%	99
重力/(N·kg^-1)	-9.81
组分方程收敛指标	10^-5
能量收敛指标	10^-6

Numerical simulation of CO₂ injection for fire prevention in a goaf affected by normal fault influence

RichHTML

PDF

Knowledge

Abstract

Cite this article

share this article

Figures/Tables 14

References 25

Related Articles 15

Recommended Articles

Metrics

Comments

[1]	Tan Luyao, Yao Yongzheng, Pan Aolan, Hu Maowei. Numerical simulation of hydrogen diffusion from hydrogen dispenser leakage [J]. China Safety Science Journal, 2026, 36(5): 224-233.
[2]	WANG Jiyun, WANG Zichao, ZONG Ruowen, LIU Xuanya. Study on hazard characteristics and onset time of hazard escalation of leakage fires in diesel road tankers [J]. China Safety Science Journal, 2026, 36(3): 194-202.
[3]	AN Xuexu, HU Zhiping, WANG Zhenlin, TIAN An'an, ZHANG Yonghui. Meso response mechanism of diorite under loading and unloading conditions [J]. China Safety Science Journal, 2026, 36(3): 221-228.
[4]	ZHAO Bo. Risk assessment model for embankment slope failure in mining goafs [J]. China Safety Science Journal, 2026, 36(2): 121-126.
[5]	JIN Chenchen, DING Yong, LI Denghua. Equivalent permeation aperture identification method for geomembranes based on seepage-sensing structure [J]. China Safety Science Journal, 2026, 36(2): 145-152.
[6]	ZHANG Hongshuo, GAO Ke, YU Jiankang, LI Qiwen. Reconstruction and analysis of PNM for free accumulation of rock blocks in fully mechanized top-coal caving goaf of coal mines [J]. China Safety Science Journal, 2026, 36(2): 153-162.
[7]	SUN Wei, MENG Shuchi, DING Yonghong, SHI Anzhong. Comparative study on shear stress distribution characteristics of tension-dispersed anchors in rock support [J]. China Safety Science Journal, 2025, 35(S2): 103-109.
[8]	GUO Weiqiang, LAN Tianwei, LU Kaixiang, LI Zhu, YAO Xinyu, FENG Wei. Mechanism analysis of overburden rock damage law and disaster caused by sudden water surge of thick coal seams [J]. China Safety Science Journal, 2025, 35(S2): 110-117.
[9]	DU Wenxiu, YAN Lu. Stability of open-pit mining slope: a case study of Barun mine [J]. China Safety Science Journal, 2025, 35(S2): 196-202.
[10]	LI Lei, WU Di, YANG Guanding. Rheological properties and pipeline transportation of cemented waste rock backfill slurry [J]. China Safety Science Journal, 2025, 35(S2): 29-35.
[11]	LYU Jirui, CUI Ming, CAI Qingchi, ZHAO Yuanye, LI Qingwen. Influence of EPB construction sequence and soil chamber pressure on railway subgrade settlement [J]. China Safety Science Journal, 2025, 35(S2): 58-65.
[12]	WEN Jinglin, YIN Yongming, YU Zhengxing, WANG Yifan, LU Xin'ai. Force deformation and destructive features of mine slopes under varied conditions [J]. China Safety Science Journal, 2025, 35(S2): 66-72.
[13]	ZHANG Yu, ZHAO Meng, WANG Feiyu, WANG Ruixin. Study on distribution characteristics of wind flow in stopes of Haerwusu Open-Pit Coal Mine [J]. China Safety Science Journal, 2025, 35(S1): 130-136.
[14]	HOU Wenbin, LI Shaopeng, LI Wei, YAO Ji, LI Zhiquan. Collaborative fire prevention and extinguishing technology for goaf in shallow-buried and close-distance coal seam groups [J]. China Safety Science Journal, 2025, 35(S1): 59-63.
[15]	ZANG Yanjie. Research on prediction method of coal spontaneous combustion degree based on IWOA-LightGBM [J]. China Safety Science Journal, 2025, 35(S1): 64-70.