Analysis of influence of laying heat insulation layer on cooling effect of roadway

doi:10.16265/j.cnki.issn1003-3033.2024.11.0315

Abstract

Abstract:

In order to solve the heat damage issue brought by deep mining in coal mines, based on ANSYS simulation software, the roadway heat insulation model was constructed. The influence of basic parameters of different heat insulation layers and laying methods on the roadway wall structure was analyzed, and the cooling effect of the heat insulation roadway was further investigated. The results of the study show that the laying of the heat insulation layer could reduce the radius of the peripheral rock heat-regulating circle and slow down the heat dissipation of the peripheral rock, and the three ways of laying the heat insulation layer have little effect on the temperature field of the peripheral rock. Compared with the temperature of the non-insulated support layer, the average temperature of the support layer is reduced significantly by laying of the heat insulation layer in the rock-adhering type, whereas the opposite is true for wall-adhering type and the sandwich type. The increase in the thickness of the heat insulation layer and the decrease in the heat conduction coefficient of heat-insulating material could increase the heat-insulating effect, and 7cm is the optimal thickness of heat insulation layer. Excessive inlet wind speed or air temperature will affect the cooling effect of heat-insulated roadway. Heat-insulated roadway is suitable for high temperature roadway with low wind speed, low inlet air temperature and long ventilation distance.

Key words: insulation layer, roadway insulation, cooling effect, temperature field of surrounding rock, temperature gradient, airflow temperature

CLC Number:

X936

CUI Daxiong, YOU Bo, GAO Ke, YANG Ming, HAN Qiaoyun, CHEN Yuansen. Analysis of influence of laying heat insulation layer on cooling effect of roadway[J]. China Safety Science Journal, 2024, 34(11): 153-162.

Figures/Tables 14

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材料	密度/ (kg·m^-3)	导热系数/ (W·m^-1·℃^-1)	比热容/ (J·kg^-1·K^-1)	动力黏度/ (Pa·s)
巷道围岩	2 330	2.62	880	—
支护层	2 400	1.74	1 000	—
空气	1.205	0.025 9	1 005	1.81×10^-5

边界条件	参数设置
求解器	压力求解器
湍流强度	5%
求解方法	压力耦合半隐式方法
速度入口/(m·s^-1)	1
入口风温/℃	24
围岩初始温度/℃	50
壁面粗糙度常数	0.5
壁面粗糙高度/m	0.07

入口风速/ (m·s^-1)	巷道出口风流温度/℃		降幅/%
入口风速/ (m·s^-1)	隔热前	隔热后	降幅/%
1	31.40	30.15	3.89
2	28.15	27.37	2.77
3	26.88	26.33	2.04
4	26.21	25.77	1.67

入口风温/℃	巷道出口风流温度/℃		降幅/%
入口风温/℃	隔热前	隔热后	降幅/%
24	31.40	30.15	3.89
26	32.83	31.67	3.53
28	34.26	33.20	3.09
30	35.69	34.73	2.68