高温矿井温度场演化规律与降温技术研究

发布时间：2018-02-28 04:04

本文关键词： 高温矿井耦合放热传热机理温度场演化规律风流温度预测　出处：《辽宁工程技术大学》2014年博士论文　论文类型：学位论文

【摘要】：随着煤炭开采向深部发展,由开采深度的增加和采掘机械化程度的提高所引起的矿井热害问题愈来愈严重,已经成为制约煤矿安全开采的难题之一。矿井的高温环境,不仅影响矿山企业的生产安全和降低作业人员的工作效率,而且还危害职工的身心健康和生命安全。改善井下气候条件,防止热害发生,进行热害防治理论和技术研究,已经成为煤矿安全高效生产的重要任务。论文以传热学、流体力学、地质学、通风安全学、采矿学为基础,在热源传统分类方法的基础上,按照热源的空间尺度不同,将热源分为点源、线源和面源；分析了原岩温度和矿井风流热力学参数的测定方法,完善了矿井热害调查方法和体系；采用Comsol Multiphysics软件分别对巷道内点源、线源、面源与风流的热交换进行了数值仿真分析,得出了不同热源、不同位置等条件下与风流热交换的基本规律和巷道内温度场分布状态。对矿井巷道内的热源分布和风流影响因素进了行研究,建立了井下风流压力和温度预测的热力学参数计算模型,提出了沿风流流动路线对风流温度进行分段迭加的预测方法；对巷道内存在多种热源耦合作用下风流温度进行数值仿真,得到了多热源相互作用下风流温度场的分布状态和演化规律；对矿井降温技术方案采用数值仿真方法进行了优化,结果表明,该方法能够准确预测降温方案后风流的温度,为科学准确地制定降温方案提供依据。以东海矿生产工作面为例,根据实际存在的热害问题,采用现场测试、理论分析等方法,对工作面进行了热源解析,提出了降温技术方案,并采用计算机仿真对降温方案进行优化和温度预测,将预测结果与实际应用效果进行了比较,表明该方法可以用于确定实际矿井降温方案。
[Abstract]:With the development of coal mining to the deep, the problem of thermal damage caused by the increase of mining depth and mechanization of mining is becoming more and more serious, which has become one of the difficult problems restricting the safe mining of coal mine. It not only affects the production safety of mining enterprises and reduces the working efficiency of workers, but also endangers the health of workers and the safety of their lives. The paper is based on heat transfer, fluid mechanics, geology, ventilation safety, mining science, based on the traditional classification method of heat source, according to the space scale of heat source. The heat source is divided into point source, line source and non-point source, the measuring method of original rock temperature and thermodynamic parameters of mine air flow is analyzed, and the investigation method and system of mine thermal hazard are improved. The point source and line source in roadway are analyzed by Comsol Multiphysics software. The heat exchange between the surface source and the air flow is analyzed numerically, and different heat sources are obtained. The basic rules of heat exchange with air flow and the distribution of temperature field in roadway under different positions are studied. The distribution of heat source and the influencing factors of air flow in mine roadway are studied. The calculation model of thermodynamic parameters for the prediction of air flow pressure and temperature is established, and the prediction method of superposition of air flow temperature along the air flow route is put forward. Numerical simulation of air flow temperature under the coupling of multiple heat sources in roadway is carried out, and the distribution state and evolution law of air flow temperature field under the interaction of multiple heat sources are obtained, and the numerical simulation method is used to optimize the mine cooling technology scheme. The results show that the method can accurately predict the air flow temperature after the cooling scheme, and provide the basis for the scientific and accurate formulation of the cooling scheme. Taking the Donghai Coal Mine production face as an example, according to the actual thermal hazard problem, the field test is carried out. Based on the theoretical analysis and other methods, the heat source of the working face is analyzed, and the technical scheme of cooling is put forward, and the optimization and temperature prediction of the cooling scheme are carried out by computer simulation, and the results are compared with the actual application results. It shows that this method can be used to determine the actual mine cooling scheme.
【学位授予单位】：辽宁工程技术大学
【学位级别】：博士
【学位授予年份】：2014
【分类号】：TD727.2

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