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论文中文题名:

 井巷围岩对风流调热能力模拟研究    

姓名:

 高佳南    

学号:

 201412727    

学科代码:

 085224    

学科名称:

 安全工程    

学生类型:

 工程硕士    

学位年度:

 2017    

院系:

 能源学院    

专业:

 安全工程    

第一导师姓名:

 吴奉亮    

论文外文题名:

 Simulation Research on Heat Regulate Ability of Surrounding Rock of Roadway    

论文中文关键词:

 井巷围岩 ; 调热能力 ; 变化风温 ; 调热圈    

论文外文关键词:

 surrounding rock of roadway ; heat regulating ability ; heat adjustment circle ; vaiable air temperature    

论文中文摘要:
随着矿井开采深度的加大,高温热害问题日益突出。国内高温矿井热害防治普遍采用制冷降温系统,而且多数制冷设备从国外引进,降温费用较高。同时,普通矿井具有的“冬暖夏凉”现象表明井巷围岩对风流具有明显的热调节作用。掌握围岩对风流热调节规律是制定经济高效降温方案的基础,因此对井巷围岩调热能力大小进行研究有重要意义。 研究了入口风温变化下井巷围岩调热能力数值求解模型。采用有限差分法,在井巷轴向和径向上划分单元,通过时间离散为轴向单元入口引入以时间序列记录的风温值,以此建立了入口风温变化下井巷围岩温度场数值求解模型,采用C#语言开发了相应的软件,该软件可进行井巷围岩对风流调热能力模拟研究。 模拟研究了井巷围岩调热能力及调热能力影响因素。利用开发的井巷围岩温度场模拟软件,模拟了入口风温变化下井巷围岩温度场,分析了围岩温度场的变化规律,得出了井巷围岩温度场两区分布的真实结构:在围岩径向浅部(1区),围岩温度随季节波动;在围岩径向深部(2区),围岩温度随径向深度的延伸不断升高,直至趋近于原始岩温。进一步开展了井巷围岩调热能力影响因素研究,得出地面气温年变化幅度、井深、围岩导温系数和风量对井巷围岩调热能力的影响规律,结果表明:地面气温年变化幅度和井深对井巷围岩调热能力影响显著;围岩导温系数是影响井巷围岩调热能力不容忽视的因素;风量对井巷围岩调热能力影响甚微。 建立了济三煤矿井口全风量降温热害防治系统。通过分析济三煤矿热害现状,模拟井巷围岩调热能力,为矿井热害治理拟定方案并提供依据,结果表明:一年内副井围岩累积散热量比吸热量多726477MJ,在12月围岩散热量最大,在6月围岩吸热量最大,换热量最值出现的时刻早于地面气温最值出现的时刻;采用井口全风量降温后,有效地缓解了夏季高温热害现象,副井围岩温度场两区分布特征消失,随着通风时间的延长,围岩调热圈半径逐渐向深部扩展,通风一段时间后,井底围岩调热圈半径基本不变,围岩向风流散热量逐渐减小,副井风流温升减小,井口全风量降温效果明显;当济三煤矿开采深度为1000m时,井底围岩温度场两区分布特征消除,围岩对风流热调节能力减弱,井底围岩温度不再受入口风温变化的影响,达到此开采深度,高温热害受地温影响更明显,此种情况下可考虑采用井下集中制冷降温方式治理热害。
论文外文摘要:
With the depth of mine mining increased, high temperature and heat problems become increasingly prominent. Domestic high temperature mine thermal control commonly used refrigeration cooling system, and most of the refrigeration equipment from abroad, the higher the cost of cooling. At the same time, the common "warm in winter and cool in summer" phenomenon shows that the surrounding rock has obvious heat regulation effect on the wind flow. It is important to study the law of the thermal regulation of the surrounding rock to the economic and efficient cooling scheme. Therefore, it is very important to study the heat transfer capacity of the surrounding rock. The numerical solution model of the thermal conductivity of the surrounding rock of the tunnel under the change of inlet temperature is studied. The finite difference method is used to divide the unit in the axial and radial direction of the well. The time series is used to calculate the air temperature value recorded by the time series. The numerical solution of the temperature field of the surrounding rock under the change of the inlet air temperature is established Model, using C# language developed the corresponding software, the software can be carried out by the surrounding rock on the wind flow heat transfer capacity simulation study. The factors influencing the heat transfer capacity and heat transfer capacity of the surrounding rock are simulated. The temperature field of the surrounding rock of the well under the change of the inlet temperature is simulated by using the simulation software of the surrounding rock temperature field.the variation law of the temperature field of the surrounding rock is analyzed, and the real structure of the two area distribution characteristics of the surrounding rock temperature field is obtained:in the shallow rock (1 zone) of the surrounding rock, the temperature of the surrounding rock fluctuates with the season; in the deep rock (2 zone) of the surrounding rock, the extension of the surrounding rock temperature with the radial depth is increasing until it approaches the original rock temperature.The influence factors of the annual variation range of the surface air temperature, the depth of the deep well, the thermal conductivity of the surrounding rock and the air volume on the heat transfer capacity of the surrounding rock are obtained. The results show that the annual variation of the ground temperature The influence of the amplitude and depth on the heat transfer capacity of the surrounding rock is significant. The thermal conductivity of the surrounding rock is a factor that can not be neglected in the heat transfer capacity of the surrounding rock. The air volume has little effect on the heat transfer capacity of the surrounding rock. The system of the mine ventilation cooling technology of the Jisan coal mine is established.Based on the analysis of the present situation of heat damage in the Jisan coal mine, this paper simulated the heat transfer ability of the surrounding rock of the tunnel, and provided the basis for the development of the mine heat treatment, the results show that the cumulative heat dissipation of the surrounding rock in the year is more than that of the heat absorbed 726477MJ, in December the largest amount of heat dissipation in the surrounding rock, in June the largest amount of heat absorption, the time at which the highest value of heat exchange occurs is earlier than the time at which the maximum value of ground temperature appears; using the system of the mine ventilation cooling technology of the Jisan coal mine, effectively alleviate the phenomenon of heat damage of high temperature in summer, two area distribution characteristics of the temperature field of the surrounding rock disappeared, with the extension of the ventilation time, the radius of control heat circle is gradually expanding to the deep, and the heat dissipation of the surrounding rock is gradually reduced, the system of the mine ventilation cooling technology effect is obvious. When Jisan coal mine mining depth is 1000m, the two area distribution characteristics of the surrounding rock temperature field in the bottom of the well eliminate, weakened ability to regulate the air heat, the surrounding rock temperature field in the bottom of the well is no longer affected by the entrance of air temperature seasonal changes, when mining to this depth, influenced by earth temperature is more obvious heat damage, this situation can be consider using underground centralized cooling methods to deal with heat damage.
中图分类号:

 TD727    

开放日期:

 2017-06-17    

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