井巷围岩与风流热湿交换特性研究与分析

发布时间：2018-05-31 20:53

本文选题：风流温度 + 不稳定换热系数　；参考：《安徽理工大学》2013年硕士论文

【摘要】：随着煤炭工业的发展和机械化程度的不断提高,煤矿采深逐年增加,而矿井热害也越来越严重。矿井热害会给井下作业人员的健康和煤矿的安全生产带来很大的威胁。对矿井内风流而言,其热源有多种,如围岩散热、机电设备散热、矿物氧化放热等,而围岩散热是最重要的热源之一,研究围岩与风流间的热湿交换机理和规律,对于提高矿井热参数预测能力、防治矿井热害具有重要意义。本论文通过对井巷围岩与风流间热湿交换相关理论的学习和分析研究,基于不稳定换热系数建立了围岩与风流间的热交换模型。结合两组现场实测数据在计算软件Mathematica环境下分析了相关参数对于风流温升的影响情况,包括壁面粗糙度、巷道断面周长、风流质量流量、岩石热导率、风流含湿量等,并对风流含湿量的变化对风流与围岩间热交换的影响进行了详细分析和讨论。在FLUENT环境下,通过建立相应的物理模型,分析了数值模拟方法计算风流与围岩热交换的特点。分析和研究结果表明壁面粗糙度系数对风流与围岩间的热交换的影响不明显；巷道断面周长和岩石的热导率对热交换有一定的影响；风流的质量流量对热交换的影响比较明显,并且风流量减小时风流温度的升高比风流量增加时风流温度的降低要显著；风流含湿量的变化对热交换的影响最强烈。不适合用数值模拟的方法进行风温的预测和计算。提出也可以采用类似于求解井巷通风阻力的查表法进行井下热计算。
[Abstract]:With the development of coal industry and the improvement of mechanization degree, the mining depth increases year by year, and the thermal damage of coal mine is more and more serious. Mine thermal hazard will bring great threat to the health of underground operators and the safety of coal mine production. For the air flow in mine, there are many heat sources, such as heat dissipation of surrounding rock, heat dissipation of electromechanical equipment, oxidation heat release of minerals, etc. The heat dissipation of surrounding rock is one of the most important heat sources. The heat and moisture exchange mechanism and law between surrounding rock and air flow are studied. It is of great significance to improve the prediction ability of mine thermal parameters and prevent mine thermal damage. Based on the study and analysis of the theory of heat and moisture exchange between surrounding rock and wind flow, a heat exchange model between surrounding rock and air flow is established based on the unstable heat transfer coefficient. Combined with two groups of field measured data, the influence of related parameters on air flow temperature rise is analyzed under the environment of Mathematica software, including wall roughness, tunnel section circumference, air flow mass flow, rock thermal conductivity, wind flow moisture content and so on. The influence of the moisture content of wind flow on the heat exchange between wind flow and surrounding rock is analyzed and discussed in detail. The characteristics of numerical simulation method for calculating heat exchange between wind flow and surrounding rock are analyzed by establishing the corresponding physical model in FLUENT environment. The results show that the influence of wall roughness coefficient on the heat exchange between wind flow and surrounding rock is not obvious, the circumference of roadway section and the thermal conductivity of rock have certain influence on heat exchange, and the influence of air flow mass flow on heat exchange is obvious. When the wind flow decreases, the increase of the air flow temperature is more significant than that of the air flow temperature when the wind flow decreases, and the change of the wind moisture content has the strongest effect on the heat exchange. It is not suitable to predict and calculate the wind temperature by numerical simulation. It can also be used to calculate underground heat by using table checking method similar to solving ventilation resistance of shaft and roadway.
【学位授予单位】：安徽理工大学
【学位级别】：硕士
【学位授予年份】：2013
【分类号】：TD727.2

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