【作者】 姬建虎；

【导师】 廖强；

【作者基本信息】 重庆大学 ， 动力工程及工程热物理， 2014， 博士

【摘要】 世界能源消费结构中，化石能源依然占据主导地位。随着对能源需求的增长，煤矿的开采深度在不断增加，热害矿井数量也越来越多。在高温高湿环境下工作，不仅损害工人的身体健康，降低劳动生产率，而且影响安全生产，对人的伤害大都不可逆转。目前，热害已严重制约了煤矿的发展，成为继瓦斯、火、水、矿压、粉尘之后的第六大灾害。因此，深入研究深井热害问题已成为世界煤炭开采的一项技术发展重点。本文以煤矿热害最为严重的作业点之一——掘进工作面为研究对象，对其换热特性和热害治理进行了实验和数值模拟研究，获得了掘进工作面换热计算关联式；从气候、地温和热源等方面对深部矿井的热害规律进行了系统的研究，推导出冷负荷计算式，提出热害治理的系统设计方案，开发出新型半封闭式矿用局部制冷降温系统。主要研究内容及结论如下：（1）掘进工作面传热研究根据高温矿井掘进工作面的通风和换热特点，对换热特性进行了实验研究和数值模拟分析，数值模拟结果和实验结果吻合较好。在数值模拟和实验研究基础上，得到了掘进工作面换热特性影响因素的具体关联式。为结合实际应用，将掘进面迎头、围岩及风流看作一个整体，对840个组合分别进行数值模拟，并对实验数据进行回归分析，得出了传热系数关系式。（2）深部高温矿井热害规律研究对深部高温矿井热害规律进行研究，得出了地面和井下的温度、相对湿度和气压变化曲线非常相似且同步变化，一般区域矿井地面气候参数对井下气候参数有着显著影响。对于深部高温矿井较远地区，因特殊的开拓条件、进风路线比较长和深度较大等原因，井下气温受地面气温的影响较小，热害出现的主要原因是由地温造成。推导了井下钻孔测地温的原理及巷道调热圈厚度的计算方法。随着矿井开采深度的增加，岩石的原始岩温也在增加。由于地质断层的作用，地温变化有个明显急剧增加的过程。研究确定了地温类型，恒温带的温度和深度，对矿井沿途各种热源散热量进行了定量分析，得出了沿通风线路中各种热源散热量所占的比例。（3）热害治理研究对高温矿井掘进工作面的热害治理进行了较深入的研究，推导了冷负荷计算式，计算了掘进工作面热源的散热量，确定了掘进面制冷负荷，针对掘进工作面设计出降温系统方案，开发出相应装备。实践表明系统运行稳定可靠、制冷效果好。通过PLC对系统进行控制，并可实现多种保护功能。测试结果显示，掘进工作面从迎头到离迎头100m范围内，干球温度平均降低5.6℃，湿球温度平均降低8.5℃，相对湿度平均降低20%，达到了设计要求。掘进工作面热害治理系统是比较成功的，可作为类似高温矿井热害治理的示范矿井，具有推广意义。更多还原

【Abstract】 In the world energy consumption structure, fossil energy still remains the dominantposition. With the growth of energy demand and mining depth, the number of mineswith heat hazard is increasing. It has severely constrained the development of coalmines. Currently, mine heat hazard has become the sixth coal mine disaster followingroof, gas, fire, dust and water. Therefore, further study of heat hazard has become atechnical focal point of the development of coal mining. The high temperature andhumid environment not only harm workers’ health irreversibly, but also reduce laborproductivity. The thesis takes the driving face which is one of the hottest work place asthe study object. According to the study of heat transfer characteristics and mine heatharm control, we can get the heat transfer relationship of driving face. Furthermore,systematic study is done about the law of heat harm in deep mine on the climate,geothermal and heat resources and the calculation formula of cooling load is deduced.Then it puts forward the system design for the specific coal mine and develops theworld’s first semi-closed mine cooling system. Data analysis shows that the coolingeffect is good and meets the design requirements.The thesis’s main research contentsand conclusions are as follows:（1）Study on heat transfer in driving face.According to the ventilation and heat transfer characteristics of driving face in hotmine, and on the basis of theoretical analysis of general parameters in engineeringpractice, the heat transfer characteristics are investigated by ANSYS numericalsimulation and the ratio of1:3similar experiment, the number of numerical simulationand experimental study are respectively840and280group. Through the comparison,simulation and experiment results have high degree of coincidence both on range ofvalue and variation tendency. Then the concrete forms of heat transfer coefficientcorrelation are made through regression analysis of numerical simulation results andexperimental results. Similarly, in order to combine with practical application, thisthesis sees the driving face head-on, wall rock and airflow as a whole, conductsnumerical simulation on840combinations respectively, does regression analysis of theexperimental data and gets the correlation of heat transfer coefficient.（2）Research on the law of heat harm in deep and hot mineBased on the law of heat harm in deep and hot mine, the change curve of temperature, relative humidity and air pressure between the ground and underground isvery similar and synchronous. Generally, the climate parameters on the ground haveremarkable effect on climate parameters under the mine. For the distant areas ofdeep-high temperature mine, because of special conditions of development, long airwayand other reasons, the climate on the ground has a little impact on the coal mine. Theheat damage is mainly caused by high temperature of the geothermal.Geothermal downhole drilling test theory and calculation method of thickness ofheat-adjusting layer are deduced. With the increase of the depth of coal bed, the originalrock temperature is still increasing. As the role of geological faults, the geothermaltemperature has significantly increased dramatically in the process. The thesis hasstudied and confirmed the type of geothermal, temperature and depth of constanttemperature zone. Through quantitative analysis in the heat dissipating of various heatsources along airway, the proportion of heat dissipating of various heat sources isobtained.（3）Research on heat-harm controlThrough the deep study of heat-harm control in high temperature driving face, thecalculation formula of refrigerating capacity is deduced. The heat dissipating capacity ofheat source in driving face is calculated, and the cooling system has been designed andinstalled. The practice shows that the system is stable and reliable, and also has goodcooling effect and meets the design requirements absolutely. Through the PLC tocontrol the system, it can realize many kinds of protection function. Within the100mfrom the heading face, the temperature reduction range of dry bulb mean temperatureaverage is5.6℃, and the maximum is7.5℃.The wet bulb mean temperature is8.5℃,and the maximum is11℃, and the fall scope of the relative humidity is20%on average.YongChuan coal mine local refrigeration cooling system is successful, which verifiesthe rationality of the experiment and the theory in this paper. The refrigeration coolingsystem can be used as a demonstration of mine heat harm control, and it is worthy ofbeing used widely.更多还原