本文選題：蒙特卡洛方法　切入點(diǎn)：無煙煤　出處：《地球物理學(xué)進(jìn)展》2017年04期 　論文類型：期刊論文

【摘要】：瓦斯壓力、溫度和含水率對煤中瓦斯吸附量具有重要影響,從微觀角度進(jìn)行無煙煤中甲烷分子吸附量研究對準(zhǔn)確測定煤層原始瓦斯含量、防治瓦斯災(zāi)害、保障煤礦安全生產(chǎn)以及開發(fā)利用煤層氣能源具有重要意義.本文以山西紅旗一坑無煙煤為研究對象,構(gòu)建了無煙煤大分子結(jié)構(gòu)模型,采用巨正則系綜蒙特卡洛方法(GCMC),通過288~308 K下對甲烷分子吸附熱計算,驗證了模型有效性,據(jù)此分析了瓦斯壓力、溫度和含水率對無煙煤中甲烷分子吸附量影響規(guī)律.研究結(jié)果表明:(1)溫度和含水率一定時,隨瓦斯壓力增加,無煙煤中甲烷分子吸附量與Langmuir吸附模型一致;(2)含水率和瓦斯壓力不變條件下,無煙煤中甲烷分子吸附量隨溫度升高線性減少,瓦斯壓力在0.01~8 MPa范圍內(nèi),隨著瓦斯壓力增加,溫度對無煙煤中甲烷分子吸附量影響程度先減小后增大;(3)含水率在0~6.494%范圍內(nèi),無煙煤中甲烷分子吸附量隨含水率增加線性減少.
[Abstract]:Gas pressure, temperature and moisture content have important influence on gas adsorption capacity in coal. From the microscopic point of view, the study of methane molecular adsorption in anthracite can accurately determine the original gas content in coal seam and prevent gas disaster. It is of great significance to ensure the safe production of coal mines and to develop and utilize CBM energy. In this paper, a large molecular structure model of anthracite is constructed, which is based on Hongqi-Yipeng anthracite in Shanxi Province. The gas pressure is analyzed based on the calculation of the adsorption heat of methane molecules at 288C 308 K by using the grand canonical ensemble Monte Carlo method. The effect of temperature and moisture content on the adsorption capacity of methane in anthracite is studied. The results show that when the temperature and moisture content are constant, the methane adsorption capacity increases with the increase of gas pressure. Under the condition of constant moisture content and gas pressure, the adsorption amount of methane molecule in anthracite decreases linearly with the increase of temperature, and the gas pressure increases with the increase of gas pressure in the range of 0.01 MPa. The effect of temperature on the adsorption of methane in anthracite decreases firstly and then increases in the range of 0 ~ 6.494%. The adsorption of methane in anthracite decreases linearly with the increase of water content.
【作者單位】： 遼寧工程技術(shù)大學(xué)力學(xué)與工程學(xué)院;
【基金】：國家自然科學(xué)基金面上項目(51374119) 國家重點(diǎn)研發(fā)計劃專項(2016YFC0600901) 遼寧省高等學(xué)校優(yōu)秀人才支持計劃(LR2015028) 遼寧省自然科學(xué)基金優(yōu)秀人才培育項目(2014020156)聯(lián)合資助
【分類號】：TD712;TQ531

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