【作者】 赵靖；

【导师】 朱能；

【作者基本信息】 天津大学 ， 供热、供燃气、通风与空调工程， 2010， 硕士

【摘要】 随着社会经济的发展,我国各类矿井开采深度的不断增加,矿井热害越来越严重,机械制冷降温成为矿井降温技术重要的发展方向。要合理选择制冷设备,首先就需要确定巷道内的冷负荷和湿负荷,弄清矿井围岩与风流热湿交换的机理,这是进行一切降温除湿技术的基础。在诸多热源中,巷道围岩的散热散湿是最主要的一项,计算过程也最为复杂。与一般建筑的空调冷负荷相比,矿井冷负荷要复杂的多。因为围岩的散热散湿是一个三维非稳态过程,传热系数与传湿系数的影响因素很多,传热传湿机理相当复杂。而目前,我国矿井一般都是延用前苏联的一些经验计算公式,但是这些公式都存在以下几个问题:一、计算时需要的参数很多,在实际工程上很难被应用;二、忽略湿度对传热的影响,计算结果往往差强人意;三、不能较为准确适用于计算中国矿井独特的情况。本文采用理论分析与模拟实验相结合的方法,首先推导出矿井围岩与风流热湿交换的微分方程组的柱坐标形式,建立一套系统的适用于矿井的数学模型。然后在实地调查、测试的基础上,按照相似理论搭建一矿井风流热湿交换模拟实验台,用与煤矿围岩热工性能相似的混凝土试件代替真实巷道,模拟矿井围岩与风流的热湿交换过程。通过变换风流进口的温度、湿度、速度,监测出口空气状态的变化和围岩内部温度的变化。经过多组实验工况的测试并利用统计学工具进行分析研究,分析出风流经过矿井湿壁巷道,沿途增温增湿的影响因素和变化规律,围岩稳态内壁温度的变化规律,以及围岩传热系数和传湿系数的回归计算公式。更多还原

【Abstract】 With the development of the social economy, the mining depth is increasing and the heat harm of mine becomes increasingly serious. The main development trend of mine temperature drop technology is mechanical refrigeration for lowering temperation. The choosing of refrigeration equipments need the cooling and humidity load of laneway first. Thus, making the mechanism of heat and humidity exchange between rock wall and airflow in mine clear is the base of mine temperature drop and dehumidification technology. The heat and humidity dissipating from the surrounding rock takes a biggest part of the total load, but the calculation of this part is most difficult. Compared with the calculation of cooling load for air conditioning building, the calculation of cooling load for mine has a higher complexity. Because the heat and humidity dissipating from the surrounding rock is a 3D unsteady process, a number of factors can influence heat transfer coefficient and humidity transfer coefficient, and the mechanism of heat and humidity exchange is quite complicated. At present, empirical formulas of former soviet union is usually used to calculate the cooling and humidity load in Chinese mines. However, some weaknesses exist in these formulas:fist, the parameters needed in these formulas are too many to make the formulas feasible; second, the effect of mass transfer is ignored which makes the calculation result not so precise; third, these formulas of former soviet union can’t be applied to calculation for Chinese mines perfectly. In this paper theory analysis and experiment simulation were combined. First, differential equations system of heat and humidity exchange between rock wall and airflow in mine in cylindrical coordinates was derived, and the mathematical modeling was built. Then on the basis of field survey and measurement, the simulation experimental bed system was built under the similarity theory to simulate the process of heat and humidity exchange between rock wall and airflow in mine. The actual sandstone in mine tunnels was replaced with concrete for its similar thermal performance in this experimental bed. The air state parameters at the outlet and temperature distribution in the surrounding rock can be monitored with changing of the temperature, humidity and velocity at the inlet of airflow. By a lot of experimental conditions and statistics methods, the influencing factors and change law of airflow heating and humidifying along the laneway when flowing through wet tunnel walls and surface steady temperature of surrounding rock was concluded, and regressive formulas for heat transfer coefficient and humidity transfer coefficient were obtained.更多还原