摘要
为解决矿井热害问题,制备了硅橡胶/中空玻璃微珠巷道壁隔热支护材料,应用相似实验系统测试了不同壁面温度、送风风速和送风温度对隔热性能的影响,分析了风流与巷道围岩的传热过程,并利用SPSS分析各因素与对流换热系数的相关性。结果表明:巷道围岩壁添加硅橡胶/中空玻璃微珠阻热材料,壁面温度在前3 min急剧下降后趋于平缓,且变化规律受送风速度影响较大,壁面温差随送风速度的减小而减小,比相同工况的未隔热围岩减小幅度最大约29%,巷道出口风温降低约50%;硅橡胶/中空玻璃微珠隔热材料稳态换热阶段随送风风速的增大,风流温升幅度减小,随送风温度的降低,风流相邻两测点及进出口温差增大。对流换热系数与风流速度、风流温度为正相关,与初始壁温呈负相关,且受风流速度影响程度最大;基于各影响因素分析,得到了隔热支护结构与围岩的换热系数关系准则式,结果可推广至实际矿井的换热过程分析。
To deal with mine heat damage,the silicone rubber/hollow glass beads was prepared as a roadway wall insulation supporting material.Based on similar experiment,the influence of different wall temperature,air supply velocity and temperature on heat insulation performance was tested and heat transfer between air flow and roadway surrounding rock was analyzed.SPSS was used to analyze the correlation between each factor and the convective heat transfer coefficient.The results show that the wall temperature tends to be flat after the sharp decline in the first 3 minutes when the heat-resisting materials was added to the roadway walls,and had great relation to the air supply velocity.The wall temperature difference was decreasing with the decreasing of the air supply velocity,whose maximum reduction was about 29%compared to uninsulated surrounding rock under the same conditions.The outlet wind temperature of the roadway was decreased by about 50%.In steady state heat transfer phase,the amplitude of air temperature rise was decreased with the increasing of air supply velocity.The temperature difference between two measurement points and inlet and outlet of air flow was increased with the decreasing of the air supply temperature.The convective heat transfer coefficient is positively correlated with air velocity and air temperature,but negatively with initial wall temperature,which is affected by the air velocity mostly.Based on the analysis of the above influence factors,a empirical correlation of heat transfer coefficient between heat insulation support structure and surrounding rock was obtained,and its can be used to extend to the heat exchange process analysis in the actual mine.
作者
薛韩玲
彭俊杰
郭佩奇
朱曌
陈柳
张波
张小艳
XUE Hanling;PENG Junjie;GUO Peiqi;ZHU Zhao;CHEN Liu;ZHANG Bo;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
2022年第3期493-500,共8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
新型隔热材料
壁面温度
送风温度
送风速度
传热规律
new heat insulation material
wall temperature
air supply temperature
air supply speed
heat transfer law
