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Gold Science and Technology ›› 2020, Vol. 28 ›› Issue (1): 61-69.doi: 10.11872/j.issn.1005-2518.2020.01.099

• Mining Technology and Mine Management • Previous Articles     Next Articles

Numerical Simulation of Temperature Distribution in Mining Area of High Temperature Mine with Auxiliary Ventilation

Long TIAN(),Zhiyong ZHOU(),Jianhong CHEN   

  1. School of Resources and Safety Engineering，Central South University，Changsha 410083，Hunan，China
  • Received:2019-06-27 Revised:2019-09-24 Online:2020-02-29 Published:2020-02-26
  • Contact: Zhiyong ZHOU E-mail:csultian@163.com;csuzzy@126.com

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Abstract:

With the mining activities going deep into the ground，the temperature environment of mining is worse because of the increase of rock temperature and air self compression heat.High temperature environment has seriously affected the development of underground mining.Air ventilation alone is not enough to remove the heat produced by surrounding rock，mining equipment and blasting.In order to reduce the temperature of driving tunnel，it is necessary to redesign the ventilation mode of mine.In this paper，the numerical simulation of the effect of adding auxiliary ventilation facilities on mine ventilation cooling was carried out.Through the establishment of numerical model，the paper set up whether there are auxiliary ventilation facilities，different length of auxiliary ventilation facilities，different distance between auxiliary ventilation facilities and the wall. After optimizing the parameters of auxiliary ventilation facilities，the paper set up conditions such as different inlet wind speed to analyze the cooling condition of driving tunnel.Through the analysis of the air velocity in the driving tunnel，we can preliminarily judge whether the air flow of the air inlet is well into the vicinity of the driving face.Through the temperature distribution of the tunnel section and the average temperature change curve of the cross section of the driving tunnel，we can directly reflect the change of the temperature of the driving tunnel.The results show that in the tunnel without auxiliary ventilation facilities，the air-conditioning flow seldom enters into the driving tunnel.By increasing the air speed of the air inlet alone，the cold air flow can’t flow into the working face more，and increasing the air speed can’t obtain significant cooling effect.By adding auxiliary ventilation facilities，the air-conditioning flow under the guidance of auxiliary ventilation facilities flows into the driving face more.The effect of ventilation and cooling is obviously improved.In the case of adding auxiliary ventilation facilities，with the increase of the length of auxiliary ventilation facilities，the cooling effect of driving roadway is getting better and better at first， but when the length of auxiliary ventilation facilities increases to a certain extent，the cooling effect of ventilation begins to decline.Increasing the distance between auxiliary ventilation facilities and walls can significantly improve the cooling effect of ventilation.In the case of the length of auxiliary ventilation facilities and auxiliary ventilation facilities and walls when the distance between the walls is fixed，the cooling effect can be improved by increasing the inlet air speed，but the cooling effect is not obvious with the increase of the air speed.The research results are helpful to give full play to the role of auxiliary ventilation facilities，effectively reduce the high temperature in the driving tunnel，and have certain reference significance for the ventilation and cooling design of the mine.

Key words: drivage roadway, mine ventilation, auxiliary ventilation, thermal disaster, mine cooling, numerical simulation

CLC Number: 

  • TD72

Fig.1

Schematic diagram of calculation model"

Table 1

Boundary conditions settings"

类型或参数设定类型或参数值类型或参数设定类型或参数值
进气道入口速度入口通风温度/K293
风速/（m·s-1）3/6巷道环境初始温度/K308
进气道出口自由流出口初始岩石温度/K318
其他壁面及辅助通风设施墙

Table 2

Computing model settings"

类型或参数设定类型或参数值类型或参数设定类型或参数值
Solver基于压力法操作压力/kPa1.013
求解格式隐式收敛容差10-4
时间属性稳态最大迭代步数4 000
湍流模型标准K-Epsilon模型

Fig. 2

Change of air flow rate with intake air speed （without auxiliary ventilation）"

Fig.3

Change of temperature distribution with intake air speed （without auxiliary ventilation）"

Fig.4

Change of average temperature with distance of tunnelling face （without auxiliary ventilation）"

Fig.5

Change of air flow rate with the length of auxiliary ventilation facilities"

Fig.6

Change of temperature distribution with the length of auxiliary ventilation facilities"

Fig.7

Change of average temperature with the length of auxiliary ventilation facilities （v=3 m/s，x=0.4 m）"

Fig.8

Variation of velocity streamline with the length of auxiliary ventilation facilities"

Fig.9

Change of air flow rate with the distance of auxiliary ventilation facilities and walls"

Fig.10

Change of temperature distribution with the distance of auxiliary ventilation facilities and walls"

Fig.11

Change of average temperature with the distance of auxiliary ventilation facilities and walls"

Fig.12

Change of air flow rate with intake air speed"

Fig.13

Change of temperature distribution with intake air speed"

Fig.14

Simulation experiment of intake air speed （a） and comparison between field test and simulation experiment （b）"

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