發(fā)布時(shí)間：2019-01-03 16:40

【摘要】：造成井下熱害最主要的原因是地球內(nèi)部熱量通過(guò)煤、巖層不斷地向井巷中的空氣傳遞,煤、巖傳遞熱量的能力與其導(dǎo)熱特性密切相關(guān),熱擴(kuò)散系數(shù)、比熱和導(dǎo)熱系數(shù)是表征煤巖導(dǎo)熱特性的基本參數(shù),煤和巖石的導(dǎo)熱特性參數(shù)的準(zhǔn)確測(cè)定對(duì)井下熱環(huán)境的研究具有重要的實(shí)際意義。本文是國(guó)家自然基金項(xiàng)目“深井開(kāi)采原巖內(nèi)部及其與風(fēng)流的固-液-氣三相耦合傳熱換濕熱害形成機(jī)理研究(51274115)”的煤巖導(dǎo)熱特性基礎(chǔ)研究部分,利用LFA457型激光導(dǎo)熱系數(shù)測(cè)試儀測(cè)定不同溫度下煤和巖石的熱擴(kuò)散系數(shù)和比熱,并通過(guò)計(jì)算得到煤和巖石的導(dǎo)熱系數(shù)。實(shí)驗(yàn)選取同一采樣點(diǎn)的煤和巖石樣品,測(cè)定樣品在原始、浸潤(rùn)水和烘干等狀態(tài)下的熱擴(kuò)散系數(shù)、比熱和導(dǎo)熱系數(shù)。結(jié)果表明：煤的熱擴(kuò)散系數(shù)和導(dǎo)熱系數(shù)遠(yuǎn)小于巖石的熱擴(kuò)散系數(shù)和導(dǎo)熱系數(shù)；煤和巖石的熱擴(kuò)散系數(shù)和導(dǎo)熱系數(shù)與溫度的倒數(shù)呈正相關(guān)；煤和巖石的熱擴(kuò)散系數(shù)、比熱和導(dǎo)熱系數(shù)隨著含水量的增加而增大；煤和巖石的導(dǎo)熱系數(shù)隨著密度的增加而增大。實(shí)驗(yàn)得到的煤和巖石的導(dǎo)熱系數(shù)值及其隨溫度呈負(fù)指數(shù)變化規(guī)律和含水量、密度呈正相關(guān)的變化規(guī)律,為深井熱害防治技術(shù)的研究提供了基礎(chǔ)支撐。
[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.
【學(xué)位授予單位】：遼寧工程技術(shù)大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：TD727.2

【引證文獻(xiàn)】

相關(guān)期刊論文 前1條

1 周西華;王原;宋東平;白剛;李昂;董強(qiáng);;基于Box Behnken設(shè)計(jì)的煤導(dǎo)熱系數(shù)分析與預(yù)測(cè)[J];中國(guó)安全生產(chǎn)科學(xué)技術(shù);2017年09期

相關(guān)博士學(xué)位論文 前1條

1 孔彪;煤巖燃燒及受熱過(guò)程的電磁輻射效應(yīng)研究[D];中國(guó)礦業(yè)大學(xué);2018年

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本文編號(hào)：2399631