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黄金科学技术 ›› 2020, Vol. 28 ›› Issue (1): 61-69.doi: 10.11872/j.issn.1005-2518.2020.01.099

• 采选技术与矿山管理 • 上一篇    下一篇

配备辅助通风的高温矿井采掘区温度分布数值模拟

田龙(),周智勇(),陈建宏   

  1. 中南大学资源与安全工程学院,湖南 长沙 410083
  • 收稿日期:2019-06-27 修回日期:2019-09-24 出版日期:2020-02-29 发布日期:2020-02-26
  • 通讯作者: 周智勇 E-mail:csultian@163.com;csuzzy@126.com
  • 作者简介:田龙(1995-),男,河南商丘人,硕士研究生,从事矿井通风降温方面的研究工作。csultian@163.com
  • 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)

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

摘要:

巷道高温是制约深部开采的一个重要因素。为了更好地发挥辅助通风设施的作用,提高短距离高温矿井的通风降温效果,采用数值模拟方法研究辅助通风设施对巷道降温效果。通过建立数值模型,设置有无辅助通风设施、不同辅助通风设施长度、不同辅助通风设施与墙壁之间的距离以及不同进气道风速等条件,分析掘进巷道的冷却情况。结果表明:无辅助通风设施的巷道仅靠增加进气道风速无法获得显著的冷却效果;在增加辅助通风设施的情况下,随着辅助通风设施长度的增加,掘进巷道的冷却效果越来越好,当辅助通风设施长度增加到一定程度后通风降温效果开始下降;增加辅助通风设施与墙壁之间的距离可显著提高通风降温效果;在辅助通风设施长度和辅助通风设施与墙壁之间距离固定的前提下,增加进气道风速可改善冷却效果,但随着风速增加,冷却效果改善越来越不明显。

关键词: 掘进巷道, 矿井通风, 辅助通风, 热灾害, 矿井降温, 数值模拟

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

中图分类号: 

  • TD72

图1

计算模型示意图(a)计算模型的3D视图;(b)计算模型的顶视图"

表1

边界条件设定"

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-13/6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

表2

计算模型设置"

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

图2

空气流速随进气速度的变化(无辅助通风)"

图3

温度分布随进气速度的变化(无辅助通风)"

图4

平均温度随掘进面距离的变化(无辅助通风)"

图5

空气流速随辅助通风设施长度的变化"

图6

温度分布随辅助通风设施长度的变化"

图7

平均温度随辅助通风设施长度的变化(v=3 m/s,x=0.4 m)"

图8

速度流线随辅助通风设施长度的变化"

图9

空气流速随辅助通风设施与墙壁距离的变化"

图10

温度分布随辅助通风设施与墙壁距离的变化"

图11

平均温度随辅助通风设施与墙壁距离的变化(v=3 m/s,BL=9 m)"

图12

空气流速随进气速度的变化"

图13

温度分布随进气速度的变化"

图14

进气速度模拟试验(a)及其与现场试验结果的对比(b)"

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