摘要
为解决煤矿开采深度不断增加伴随而来的矿井高温热害问题,基于COMSOL模拟软件,应用水玻璃膨胀蛭石涂层对高地温矿井掘进巷道围岩进行隔热降温研究。讨论了水玻璃膨胀蛭石不同厚度,不同风筒出口风温、风速对围岩调热圈及巷道风流温度变化的影响。结果表明:随着隔热层厚度的增加,掘进工作面处围岩调热圈半径减小,巷道出口风流温度降低,厚度18 cm比12 cm调热圈半径仅减小了2.3%,巷道出口风温仅降低1.2%,隔热层厚度增加到一定程度降温效果不明显;随着风筒出口风温的增大,掘进工作面调热圈半径减小,随着风筒出口风速的增大,掘进工作面调热圈半径增大,掘进工作面处及巷道出口的风流温度对比相应的无隔热工况,降温幅度逐渐减小,在风筒出口风温24℃、风速6 m/s,隔热效果较优;围岩隔热条件下对流换热系数随隔热层厚度的增大而减小,随风筒出口风温、风速的增大而增大。
In order to solve the problem of heat hazard caused by ever deeper mining,this paper applied water glass/expanded vermiculite to construct on surrounding rock wall of digging tunnel to reduce airflow temperature in high ground temperature mine.Based on COMSOL numerical simulation,heat transfer zone of surrounding rock and airflow temperature in tunnel were researched,which were influenced by different thickness of thermal insulation material,different airflow temperature and different speed at the outlet of air duct.The results showed that the radius of heat transfer zone of surrounding rock decreased,and the outlet airflow temperature in excavation roadway reduced gradually,with the increasing of thickness of the thermal insulation layer.But the effect of heat insulation was not obvious when the thickness was increased to a certain extent,the radius of heat regulating circle was reduced only by 2.3%and the airflow temperature at the exit of the tunnel decreased only by 1.2%when the thickness was increased from 12 cm to 18 cm.The radius of heat regulating circle was decreased with the increase of air temperature,but was increased with the increase of the wind speed at the outlet of the air duct,and airflow cooling speed at heading face and roadway exit was decreased compared that with no insulation,the heat insulation effect was better when the air temperature was 24℃,and the wind speed was 6 m/s at the outlet of the air duct.Convective heat transfer coefficient decreased with the increase of insulation thickness,while increased with the increase of air temperature and wind speed at the outlet of the air duct.
作者
薛韩玲
郭佩奇
彭俊杰
郭栋
陈柳
张进
张小艳
XUE Hanling;GUO Peiqi;PENG Junjie;GUO Dong;CHEN Liu;ZHANG Jin;ZHANG Xiaoyan(College of Energy Science and Engineering,Xi’an University of Science and Technology,Xi’an 710054,China)
出处
《西安科技大学学报》
CAS
北大核心
2021年第6期997-1005,共9页
Journal of Xi’an University of Science and Technology
基金
国家自然科学基金项目(51974225)。
关键词
矿井热害
围岩温度场
隔热
对流换热
heat hazard in mine
temperature field of surrounding rock
insulation
convective heat transfer
