岩块尺度对采空区煤自燃区域的影响研究  

Study on the influence of rock block scale on coal spontaneous combustion area in goaf

作　　者：高科[1,2] 张瑶 石连增[1,2] 李启文 刘泽毅 刘玉姣 GAO Ke;ZHANG Yao;SHI Lianzeng;LI Qiwen;LIU Zeyi;LIU Yujiao(College of Safety Science and Engineering,Liaoning Technical University,Huludao Liaoning 125105,China;Key Laboratory of Mine Thermodynamic Disasters and Control of Ministry of Education,Liaoning Technical University,Huludao Liaoning 125105,China)

机构地区：[1]辽宁工程技术大学安全科学与工程学院,辽宁葫芦岛125105 [2]辽宁工程技术大学矿山热动力灾害与防治教育部重点实验室,辽宁葫芦岛125105

出　　处：《中国安全生产科学技术》2024年第6期126-132,共7页Journal of Safety Science and Technology

基　　金：国家自然科学基金项目(52074148,52274205,52104194)。

摘　　要：为探究综放采空区岩块尺度对煤自然发火的影响,采用Fluent软件数值模拟不同直径岩块条件下采空区的煤自燃规律,分析采空区氧浓度场和风速场,分别以氧气体积分数和风速为指标,确定采空区氧化带面积并以二场叠加场作为采空区煤自燃危险区划分标准,研究煤自燃危险区域与岩块直径的关系。研究结果表明:当岩块直径由0增加到10 m时,以氧气体积分数为指标,氧化带宽度变小,面积由5563.84 m^(2)减至2602.69 m^(2);以风速为指标,氧化带面积由3376.60 m^(2)减至1262.95 m^(2);将2种指标确定的氧化带进行叠加得到煤自燃危险区,随着岩块直径的增加,其面积由1854.04 m^(2)减至552.91 m^(2),煤自燃危险区最大宽度由20.40 m缩减至9.06 m。研究结果可为采空区煤自燃发火区域的确定提供参考。In order to explore the influence of rock block scale on the spontaneous combustion of coal in the fully-mechanized goaf,the Fluent software was used to numerically simulate the spontaneous combustion law of coal in the goaf under different diameters of rock block,and the oxygen concentration filed air velocity field in the goaf were analyzed.The oxygen volume fraction and air velocity were respectively taken as the index,then the oxidation zone area of goaf was determined and the two-field superimposed field was used as the standard for dividing the coal spontaneous combustion hazardous zone in the goaf,and the relationship between the coal spontaneous combustion hazardous zone and the rock block diameter was studied.The results show that when the diameter of rock block increases from 0 to 10 m,the width of oxidation zone decreases when the oxygen volume fraction is used as the index,and the area decreases from 5563.84 m^(2) to 2602.69 m^(2).Taking the air velocity as the index,the area of oxidation zone decreases from 3376.60 m^(2) to 1262.95 m^(2).The oxidation zone determined by the two indexes is superimposed to obtain the coal spontaneous combustion hazardous zone,and with the increase of rock block diameter,its area decreases from 1854.04 m^(2) to 552.91 m^(2),and its maximum width decreases from 20.40 m to 9.06 m.The research results can provide reference for the determination of the coal spontaneous combustion ignition area in the goaf.

关 键 词：岩块尺度 采空区 氧化带 遗煤自燃 数值模拟 

分 类 号：X936[环境科学与工程—安全科学]