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• CN 62-1112/TF
• ISSN 1005-2518
• 创刊于1988年

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

TIAN Long,, ZHOU Zhiyong,, CHEN Jianhong

School of Resources and Safety Engineering，Central South University，Changsha 410083，Hunan，China

 基金资助: 国家自然科学基金项目“基于属性驱动的矿体动态建模及更新方法研究”.  51504286

Received: 2019-06-27   Revised: 2019-09-24   Online: 2020-03-06

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.

Keywords： drivage roadway ; mine ventilation ; auxiliary ventilation ; thermal disaster ; mine cooling ; numerical simulation

TIAN Long, ZHOU Zhiyong, CHEN Jianhong. Numerical Simulation of Temperature Distribution in Mining Area of High Temperature Mine with Auxiliary Ventilation[J]. Gold Science and Technology, 2020, 28(1): 61-69 doi:10.11872/j.issn.1005-2518.2020.01.099

## 1 几何模型设定

### 图1

（a）计算模型的3D视图；（b）计算模型的顶视图

Fig.1   Schematic diagram of calculation model

### 2.2 数学模型

$∇⋅ρCpUT=∇⋅keff+CpμtPrt∇T$

$μt=ρCμk2ε$

K-Epsilon模型是考虑了求解湍流动能k和耗散速率ε的双方程模型，它与湍流黏度相结合。该模型可表示为

### 2.3 边界条件

《金属非金属矿山安全规程》（GB 16423-2006）中规定：运输巷道、采区进风道最高风速为6 m/s。因此，按照规程规定对没有配备辅助通风设施的情况设置了3 m/s和6 m/s的进气道空气流速，对增加辅助通风设施的情况仅设置了3 m/s的进气道空气流速[20]。所有进气温度均设置固定温度为293 K[5]，所有墙壁（除辅助通风设施外）设置318 K的固定温度。假设巷道围岩均质且各向同性；巷道壁面换热条件一致，即：假定在某一条巷道的壁面，其换热条件相同，均在其周长上，热交换的条件也相同；围岩热量完全传递给风流。数值模拟使用商业有限体积求解器ANSYS Fluent求解几何和边界条件。围岩和辅助通风设施均使用Fluent中默认的“wall”设置。气流使用默认空气设置，使用1个大气压时的空气参数。湍流模型选择标准K-Epsilon模型，收敛容差设置为10-4，利用半隐式压力连接方程（SIMPLE）算法，二阶迎风离散化方法和代数多重网格法（AGM）求解方程。该研究的详细边界条件和计算模型设置如表1表2所示。

Table 1  Boundary conditions settings

Table 2  Computing model settings

Solver基于压力法操作压力/kPa1.013

### 图2

Fig. 2   Change of air flow rate with intake air speed （without auxiliary ventilation）

### 图3

Fig.3   Change of temperature distribution with intake air speed （without auxiliary ventilation）

### 图4

Fig.4   Change of average temperature with distance of tunnelling face （without auxiliary ventilation）

### 图5

Fig.5   Change of air flow rate with the length of auxiliary ventilation facilities

### 图6

Fig.6   Change of temperature distribution with the length of auxiliary ventilation facilities

### 图7

Fig.7   Change of average temperature with the length of auxiliary ventilation facilities （v=3 m/s，x=0.4 m）

### 图8

Fig.8   Variation of velocity streamline with the length of auxiliary ventilation facilities

### 图9

Fig.9   Change of air flow rate with the distance of auxiliary ventilation facilities and walls

### 图10

Fig.10   Change of temperature distribution with the distance of auxiliary ventilation facilities and walls

### 图11

Fig.11   Change of average temperature with the distance of auxiliary ventilation facilities and walls

### 图12

Fig.12   Change of air flow rate with intake air speed

### 图13

Fig.13   Change of temperature distribution with intake air speed

### 图14

Fig.14   Simulation experiment of intake air speed （a） and comparison between field test and simulation experiment （b）

## 4 结论

（1） 当没有使用辅助通风设施时，风速的增加不能显著提高进入巷道的风量。

（2） 通过引入辅助通风设施，巷道温度明显降低。对于增加辅助通风设施的全部案例，掘进面附近温度最低，随后温度快速升高，并在中间较长距离保持小幅波动状态，在进气道附近又快速下降。

（3） 辅助通风设施的长度及其与墙壁之间的距离会影响巷道的通风降温效果。随着长度的增加，降温效果先增强后减弱；增加辅助通风设施与墙壁之间的距离可以显著提高通风降温效果。

（4） 固定辅助通风设施的长度及其与墙壁之间的距离，提高进气道风速可以改善巷道内的降温效果。随着风速的增加，改善效果越来越不明显。

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