高温井巷隔热材料的性能研究

发布时间：2018-01-07 19:14

本文关键词：高温井巷隔热材料的性能研究　出处：《安徽理工大学》2017年硕士论文　论文类型：学位论文

【摘要】：随着我国工业化进程的持续推进,各产业的用煤量不断上升,地下浅部煤矿资源面临枯竭,进而矿井开采深度不断增加,随之而来热害现象亦日趋严重。矿井热害现象不仅严重危害了井下工作人员的身心健康,同时对煤炭的生产安全与效率产生了影响,热害问题已成为煤炭工业亟需解决的重要问题。目前,国内外学者已在关于矿井降温的理论与技术方面取得一定研究成果。本论文在前人研究成果的基础上,从降低围岩散热量为目的出发,提出了在巷道支护中采用掺有玻化微珠、陶粒的隔热混凝土替代传统普通混凝土以达到延缓围岩放热、降低风流温度、减少矿井机械降温冷负荷的目的。本论文首先在传热学理论的基础上,分析了围岩的传热规律与隔热材料的隔热原理以及对隔热性能的影响因素,重点提出了巷道围岩与支护结构散热量的计算方法与各影响因素对材料有效导热系数贡献的计算公式,为进一步进行隔热材料的试验与理论分析提供了基础。通过设计正交试验,并采用直观分析法与方差分析法综合分析了陶粒用量、玻化微珠用量、粉煤灰用量、砂子用量四个因素对材料隔热性能的影响程度,并得出隔热性能较优的一组配合比。而后利用FLUENT软件对喷射普通混凝土的巷道与喷射玻化微珠陶粒混凝土的巷道温度场进行数值模拟,在理论上进一步分析比较了该隔热材料较普通混凝土关于隔热性能方面的优势;并参考数值模拟所得的计算结果,分别计算了在巷道支护中采用玻化微珠陶粒混凝土与普通混凝土时,巷道围岩散热部分的冷负荷,以此分析了该材料在降低能耗方面的作用。综合以上对本论文所研究的矿井巷道隔热材料的分析,在巷道支护中采用玻化微珠陶粒混凝土确实能够很好的起到延缓围岩散热,降低制冷能耗的作用,从长远考虑,对于矿井热害治理的节能性与经济性具有重要意义。为今后矿井降温技术的发展提供了重要的参考价值。
[Abstract]:With the continuous progress of industrialization in China, the amount of coal used in various industries is increasing, and the underground shallow coal resources are facing depletion, and then the mining depth of the mine is increasing. The phenomenon of mine thermal damage not only seriously endangers the physical and mental health of underground workers, but also has an impact on the safety and efficiency of coal production. Thermal hazard has become an important problem in coal industry. At present, domestic and foreign scholars have achieved some research results in the theory and technology of mine cooling. This paper is based on the previous research results. In order to reduce the heat loss of surrounding rock, it is put forward that the heat-insulating concrete mixed with vitrified microbeads and ceramsite can replace the traditional ordinary concrete in order to delay the heat release of surrounding rock and reduce the temperature of air flow. The purpose of reducing cooling and cooling load of mine machinery. Firstly, on the basis of heat transfer theory, this paper analyzes the heat transfer law of surrounding rock, the thermal insulation principle of thermal insulation material and the influence factors on thermal insulation performance. The calculation method of the heat loss of surrounding rock and supporting structure of roadway and the formula of the contribution of each influencing factor to the effective thermal conductivity of material are put forward. This paper provides a basis for further experimental and theoretical analysis of thermal insulation materials. Through the design of orthogonal experiments, the amount of ceramsite, vitrified microbeads and fly ash are comprehensively analyzed by means of visual analysis and variance analysis. The influence of four factors on the thermal insulation performance of the material. Then the temperature field of the roadway of ordinary shotcrete and that of vitrified vitrified ceramsite concrete is numerically simulated by FLUENT software. In theory, the advantages of the heat insulation material compared with ordinary concrete on thermal insulation performance are further analyzed and compared. With reference to the calculated results of numerical simulation, the cold load of surrounding rock heat dissipation part of roadway is calculated respectively when glass beaded ceramsite concrete and ordinary concrete are used in roadway support. This paper analyzes the effect of this material on reducing energy consumption, and synthesizes the above analysis of the thermal insulation material of mine roadway studied in this paper. In the roadway support the use of vitrified microbead ceramsite concrete can really play a very good role in delaying the heat dissipation of surrounding rock and reducing cooling energy consumption from the long-term perspective. It is of great significance for the energy saving and economy of mine thermal disaster control, and provides an important reference value for the development of mine cooling technology in the future.
【学位授予单位】：安徽理工大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TD727.2;TU551

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