特厚煤层分层开采的自燃危险区域演化特征  

Evolution characteristics of spontaneous combustion hazard zone in layered mining of extra thick coal seams

作　　者：张美长 祁云 汪伟 梁然 刘蓉蒸 白晨浩 ZHANG Meichang;QI Yun;WANG Wei;LIANG Ran;LIU Rongzheng;BAI Chenhao(School of Mining,Liaoning Technical University,Fuxin Liaoning 123000,China;College of Mechanical Engineering and Automation,Liaoning University of Technology,Jinzhou Liaoning 121001,China;School of Coal Engineering,Shanxi Datong University,Datong Shanxi 037000,China)

机构地区：[1]辽宁工程技术大学矿业学院,辽宁阜新123000 [2]辽宁工业大学机械工程与自动化学院,辽宁锦州121001 [3]山西大同大学煤炭工程学院,山西大同037000

出　　处：《中国安全科学学报》2024年第8期147-154,共8页China Safety Science Journal

基　　金：辽宁省教育厅基本科研项目(LJKMZ20220690);山西省基础研究计划(自由探索类)青年项目(202203021222300);山西省高等学校科技创新计划项目(2022L448,2022L449)。

摘　　要：为有效且准确地判断特厚煤层开采中采空区内气体浓度场、温度场以及流场分布特征,进而确定特厚煤层分层开采的自燃危险区域,以灵泉矿172307工作面为例,采用数值模拟技术手段,以采空区多场耦合机制为基础,构建特厚煤层分层开采的采空区煤自燃数学模型,并结合煤体耗氧速率、放热强度、自燃临界氧气体积分数以及孔隙率和渗透率的分布模型,通过联立求解,得到稳定状态下特厚煤层分层开采的自燃危险区域演化特征。结果表明:在上分层采空区,高氧气体积分数区域和高温区域均主要位于终采线附近以及进、回风巷上部位置,主要漏风区域位于终采线处。在复合采空区内,高氧气体积分数区域主要位于进风侧和回风侧,随着不断往采空区深部移动,氧气体积分数呈现减小的趋势;且在距离采煤工作面的一定距离出现类似“椭圆”的局部高温区。In order to more effectively and accurately judge the gas concentration field,temperature field,and flow field distribution in the goaf during the mining of extra thick coal seams,and thereby determine the self-ignition risk area for layered mining of extra thick coal seams,taking the 172307 working face of Lingquan mine as an example,numerical simulation technology was used to establish a mathematical model of coal spontaneous combustion in the goaf for layered mining of extra thick coal seams based on the coupling mechanism of multiple fields in the goaf.Combined with the distribution models of coal oxygen consumption rate,heat release intensity,critical oxygen concentration for spontaneous combustion,porosity and permeability,the evolution law of the spontaneous combustion risk zone for layered mining of extra thick coal seams in a stable state was obtained through the simultaneous solution.The results show that in the upper layered goaf,the high oxygen concentration area and the high-temperature area are mainly located near the stop mining line and in the upper part of the intake and return air tunnels,and the main air leakage area is located at the stop mining line.In the composite goaf,the high oxygen concentration area is mainly located on the inlet and return air sides.As it moves towards the deeper part of the goaf,the oxygen concentration shows a decreasing trend.And a local high-temperature zone resembling an ellipse appears at a certain distance from the coal mining face.

关 键 词：特厚煤层 分层开采 自燃危险区域 数值模拟 氧气体积分数 

分 类 号：X936[环境科学与工程—安全科学]