正断层影响下采空区注CO2防灭火数值模拟研究

doi:10.16265/j.cnki.issn1003-3033.2025.04.1231

中国安全科学学报 ›› 2025, Vol. 35 ›› Issue (4): 9-17.doi: 10.16265/j.cnki.issn1003-3033.2025.04.1231

正断层影响下采空区注CO₂防灭火数值模拟研究

张嘉勇教授¹^,²(), 吕祖欣¹, 崔啸¹^,²^,³^,^**(), 郭立稳教授¹^,², 武建国³, 付京斌⁴

¹ 华北理工大学应急管理与安全工程学院,河北唐山 063210
² 河北省矿业开发与安全技术重点实验室,河北唐山 063210
³ 开滦(集团)有限责任公司,河北唐山 063000
⁴ 冀中能源峰峰集团有限责任公司,河北邯郸 056001

收稿日期:2024-12-05 修回日期:2025-02-18 出版日期:2025-04-28
通信作者:
**崔啸(1992—),男,河北卢龙人,博士,讲师,主要从事矿井瓦斯方面的研究。E-mail:cuixiao@ncst.edu.cn。
作者简介:
张嘉勇 (1977—),男,河南南阳人,博士,教授,主要从事矿山安全理论与技术、安全管理与评价等方面的研究。E-mail:zjy815@163.com。
基金资助:
国家自然科学基金资助(52174182); 河北省省级科技计划项目(21376202D); 河北省自然科学基金资助(E2020209074)

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

ZHANG Jiayong¹^,²(), LYU Zuxin¹, CUI Xiao¹^,²^,³^,^**(), GUO Liwen¹^,², WU Jianguo³, FU Jingbin⁴

¹ School of Emergency Management and Safety Engineering, North China University of Science and Technology, Tangshan Hebei 063210, China
² Key Laboratory of Mining Development and Safety Technology of Hebei Province, Tangshan Hebei 063210, China
³ Kailuan (Group) Limited Liability Company, Tangshan Hebei 063000, China
⁴ Jizhong Energy Fengfeng Group limited Liability Company, Handan Hebei 056001, China

Received:2024-12-05 Revised:2025-02-18 Published:2025-04-28

摘要/Abstract

摘要：

为解决正断层地质构造下采空区遗煤自然发火的问题,利用程序升温氧化装置测定煤样的耗氧速率和放热强度,基于采空区多孔介质模型与气体组分运输方程,构建正断层影响下采空区进风侧压注CO₂数值模型,模拟工作面距断层位置变化对采空区自燃氧化带宽度的影响机制,并分析不同注CO₂位置和注CO₂流量下采空区内气体运移特征。研究结果表明:随着工作面与断层距离的增加,采空区氧化带宽度呈先增大后减小的趋势,在距断层70 m处时,氧化带宽度达到最大。随着CO₂注入位置的深入,氧化带宽度呈先减小后增加的趋势,当CO₂注入位置距工作面40 m时,氧化带宽度达到最小;随着CO₂注入量的增加,氧化带宽度呈负指数减小趋势,当CO₂注入量为1 000 m³/h时,且在工作面CO₂体积分数低于0.4%的安全前提下,氧化带宽度达到最小。

关键词: 采空区, 正断层, CO₂防灭火, 数值模拟, 煤自燃, 氧化带宽度

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

中图分类号:

X928.7火灾与爆炸事故

张嘉勇, 吕祖欣, 崔啸, 郭立稳, 武建国, 付京斌. 正断层影响下采空区注CO₂防灭火数值模拟研究[J]. 中国安全科学学报, 2025, 35(4): 9-17.

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.

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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

正断层影响下采空区注CO₂防灭火数值模拟研究

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

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