掘进工作面传热特性及热害治理研究
发布时间：2018-11-27 07:33
【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。
[Abstract]:In the world energy consumption structure, fossil energy still occupies the leading position. With the increase of energy demand, the mining depth of coal mine is increasing, and the number of thermal damage mine is increasing. Working in high temperature and high humidity not only damages workers' health, reduces labor productivity, but also affects production safety. At present, thermal damage has seriously restricted the development of coal mines and has become the sixth major disaster after gas, fire, water, mine pressure and dust. Therefore, it has become a technical development focus of coal mining in the world to study the deep well thermal hazard problem in depth. In this paper, the heat transfer characteristics and heat damage control of tunneling face, one of the most serious working points of coal mine, are studied experimentally and numerically, and the correlation formula of heat transfer calculation is obtained. From the aspects of climate, ground temperature and heat source, this paper systematically studies the heat damage law of deep mine, deduces the calculation formula of cooling load, puts forward the system design scheme of heat damage control, and develops a new type of semi-closed local refrigeration cooling system for mine. The main research contents and conclusions are as follows: (1) the heat transfer in tunneling face is studied experimentally and numerically according to the ventilation and heat transfer characteristics of high temperature mining face. The numerical simulation results are in good agreement with the experimental results. On the basis of numerical simulation and experimental study, the specific correlation formula of factors affecting heat transfer characteristics of heading face is obtained. In order to combine the practical application, 840 combinations were numerically simulated, and the regression analysis of experimental data was carried out, and the heat transfer coefficient relationship was obtained by taking head-on heading, surrounding rock and wind flow as a whole. (2) the study on the thermal damage law of deep high temperature mine. The temperature, relative humidity and pressure change curves of ground and underground are very similar and synchronous. The surface climatic parameters of general regional mines have a significant effect on the underground climatic parameters. For the deep high temperature mine, because of the special developing conditions, the air inlet route is longer and the depth is larger, the underground air temperature is less affected by the surface temperature, and the main reason of the thermal damage is caused by the ground temperature. The principle of underground borehole temperature measurement and the method of calculating the thickness of tunnel heat regulating circle are deduced. As the depth of mining increases, so does the temperature of the original rock. Because of the action of geological fault, the change of ground temperature has a process of sharp increase. The type of ground temperature, the temperature and depth of isothermal zone are determined, the heat emission of various heat sources along the mine is quantitatively analyzed, and the proportion of heat emission of various heat sources along the ventilation line is obtained. (3) the research of heat disaster control has carried on the deeper research to the heat disaster treatment of the high temperature mine driving face, has deduced the cold load calculation formula, has calculated the heat source heat dissipation of the heading face, has determined the driving surface refrigeration load, has carried on the thorough research to the high temperature mine tunneling face. The cooling system is designed for the heading face and the corresponding equipment is developed. Practice shows that the system is stable and reliable, and the refrigeration effect is good. The system is controlled by PLC, and many protection functions can be realized. The test results show that the dry ball temperature decreases 5.6 鈩
本文编号：2359880
[Abstract]:In the world energy consumption structure, fossil energy still occupies the leading position. With the increase of energy demand, the mining depth of coal mine is increasing, and the number of thermal damage mine is increasing. Working in high temperature and high humidity not only damages workers' health, reduces labor productivity, but also affects production safety. At present, thermal damage has seriously restricted the development of coal mines and has become the sixth major disaster after gas, fire, water, mine pressure and dust. Therefore, it has become a technical development focus of coal mining in the world to study the deep well thermal hazard problem in depth. In this paper, the heat transfer characteristics and heat damage control of tunneling face, one of the most serious working points of coal mine, are studied experimentally and numerically, and the correlation formula of heat transfer calculation is obtained. From the aspects of climate, ground temperature and heat source, this paper systematically studies the heat damage law of deep mine, deduces the calculation formula of cooling load, puts forward the system design scheme of heat damage control, and develops a new type of semi-closed local refrigeration cooling system for mine. The main research contents and conclusions are as follows: (1) the heat transfer in tunneling face is studied experimentally and numerically according to the ventilation and heat transfer characteristics of high temperature mining face. The numerical simulation results are in good agreement with the experimental results. On the basis of numerical simulation and experimental study, the specific correlation formula of factors affecting heat transfer characteristics of heading face is obtained. In order to combine the practical application, 840 combinations were numerically simulated, and the regression analysis of experimental data was carried out, and the heat transfer coefficient relationship was obtained by taking head-on heading, surrounding rock and wind flow as a whole. (2) the study on the thermal damage law of deep high temperature mine. The temperature, relative humidity and pressure change curves of ground and underground are very similar and synchronous. The surface climatic parameters of general regional mines have a significant effect on the underground climatic parameters. For the deep high temperature mine, because of the special developing conditions, the air inlet route is longer and the depth is larger, the underground air temperature is less affected by the surface temperature, and the main reason of the thermal damage is caused by the ground temperature. The principle of underground borehole temperature measurement and the method of calculating the thickness of tunnel heat regulating circle are deduced. As the depth of mining increases, so does the temperature of the original rock. Because of the action of geological fault, the change of ground temperature has a process of sharp increase. The type of ground temperature, the temperature and depth of isothermal zone are determined, the heat emission of various heat sources along the mine is quantitatively analyzed, and the proportion of heat emission of various heat sources along the ventilation line is obtained. (3) the research of heat disaster control has carried on the deeper research to the heat disaster treatment of the high temperature mine driving face, has deduced the cold load calculation formula, has calculated the heat source heat dissipation of the heading face, has determined the driving surface refrigeration load, has carried on the thorough research to the high temperature mine tunneling face. The cooling system is designed for the heading face and the corresponding equipment is developed. Practice shows that the system is stable and reliable, and the refrigeration effect is good. The system is controlled by PLC, and many protection functions can be realized. The test results show that the dry ball temperature decreases 5.6 鈩
本文编号：2359880
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