煤岩导热特性实验研究
发布时间：2019-01-03 16:40
【摘要】：造成井下热害最主要的原因是地球内部热量通过煤、岩层不断地向井巷中的空气传递,煤、岩传递热量的能力与其导热特性密切相关,热扩散系数、比热和导热系数是表征煤岩导热特性的基本参数,煤和岩石的导热特性参数的准确测定对井下热环境的研究具有重要的实际意义。本文是国家自然基金项目“深井开采原岩内部及其与风流的固-液-气三相耦合传热换湿热害形成机理研究(51274115)”的煤岩导热特性基础研究部分,利用LFA457型激光导热系数测试仪测定不同温度下煤和岩石的热扩散系数和比热,并通过计算得到煤和岩石的导热系数。实验选取同一采样点的煤和岩石样品,测定样品在原始、浸润水和烘干等状态下的热扩散系数、比热和导热系数。结果表明：煤的热扩散系数和导热系数远小于岩石的热扩散系数和导热系数；煤和岩石的热扩散系数和导热系数与温度的倒数呈正相关；煤和岩石的热扩散系数、比热和导热系数随着含水量的增加而增大；煤和岩石的导热系数随着密度的增加而增大。实验得到的煤和岩石的导热系数值及其随温度呈负指数变化规律和含水量、密度呈正相关的变化规律,为深井热害防治技术的研究提供了基础支撑。
[Abstract]:The main cause of underground thermal damage is the heat transfer from the earth's interior through coal and rock to the air in the roadway. The ability of coal and rock to transmit heat is closely related to its thermal conductivity and thermal diffusion coefficient. Specific heat and thermal conductivity are the basic parameters to characterize the thermal conductivity of coal and rock. The accurate measurement of thermal conductivity of coal and rock is of great practical significance to the study of underground thermal environment. This paper is a part of the basic research on the thermal conductivity characteristics of coal and rock in the National Natural Fund project, "formation mechanism of heat transfer and heat transfer damage caused by solid-liquid-gas three-phase coupling heat transfer and heat transfer (51274115) in the original rock of deep well mining and its interaction with air flow". The thermal diffusivity and specific heat of coal and rock at different temperatures were measured by LFA457 laser thermal conductivity tester, and the thermal conductivity of coal and rock was calculated. The thermal diffusivity, specific heat and thermal conductivity of coal and rock samples at the same sampling point were measured under the condition of raw, infiltrating water and drying. The results show that the thermal diffusivity and thermal conductivity of coal are much smaller than those of rock, and the thermal diffusivity and thermal conductivity of coal and rock are positively correlated with the reciprocal of temperature. The thermal diffusivity, specific heat and thermal conductivity of coal and rock increase with the increase of water content, and the thermal conductivity of coal and rock increase with the increase of density. The experimental results show that the thermal conductivity of coal and rock varies exponentially with temperature, the change of water content and density is positive correlation, which provides the basic support for the research of thermal hazard prevention technology in deep wells.
【学位授予单位】：辽宁工程技术大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TD727.2
本文编号：2399631
[Abstract]:The main cause of underground thermal damage is the heat transfer from the earth's interior through coal and rock to the air in the roadway. The ability of coal and rock to transmit heat is closely related to its thermal conductivity and thermal diffusion coefficient. Specific heat and thermal conductivity are the basic parameters to characterize the thermal conductivity of coal and rock. The accurate measurement of thermal conductivity of coal and rock is of great practical significance to the study of underground thermal environment. This paper is a part of the basic research on the thermal conductivity characteristics of coal and rock in the National Natural Fund project, "formation mechanism of heat transfer and heat transfer damage caused by solid-liquid-gas three-phase coupling heat transfer and heat transfer (51274115) in the original rock of deep well mining and its interaction with air flow". The thermal diffusivity and specific heat of coal and rock at different temperatures were measured by LFA457 laser thermal conductivity tester, and the thermal conductivity of coal and rock was calculated. The thermal diffusivity, specific heat and thermal conductivity of coal and rock samples at the same sampling point were measured under the condition of raw, infiltrating water and drying. The results show that the thermal diffusivity and thermal conductivity of coal are much smaller than those of rock, and the thermal diffusivity and thermal conductivity of coal and rock are positively correlated with the reciprocal of temperature. The thermal diffusivity, specific heat and thermal conductivity of coal and rock increase with the increase of water content, and the thermal conductivity of coal and rock increase with the increase of density. The experimental results show that the thermal conductivity of coal and rock varies exponentially with temperature, the change of water content and density is positive correlation, which provides the basic support for the research of thermal hazard prevention technology in deep wells.
【学位授予单位】：辽宁工程技术大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TD727.2
【引证文献】
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相关博士学位论文 前1条
1 孔彪;煤岩燃烧及受热过程的电磁辐射效应研究[D];中国矿业大学;2018年
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