本文選題：低階煤　切入點(diǎn)：吸附孔　出處：《西安科技大學(xué)》2017年碩士論文　論文類型：學(xué)位論文

【摘要】：新疆地區(qū)煤炭資源含量豐富,煤層條件復(fù)雜,阜康礦區(qū)作為其煤炭的重要生產(chǎn)基地之一,資源條件優(yōu)越,具有廣闊的煤層氣開發(fā)前景。研究阜康礦區(qū)低階煤的吸附孔特征和瓦斯放散性能,以及吸附孔特征對(duì)瓦斯放散性能的影響關(guān)系,能夠?yàn)榈V井生產(chǎn)過程中的瓦斯災(zāi)害防治和煤層氣抽采利用提供基礎(chǔ)依據(jù)。本文選取新疆阜康礦區(qū)八個(gè)典型礦井的主采煤層煤樣進(jìn)行實(shí)驗(yàn)研究,實(shí)驗(yàn)煤樣宏觀物理性質(zhì)基本相似。通過煤樣的工業(yè)分析實(shí)驗(yàn)和顯微組分分析實(shí)驗(yàn),分別得到煤樣的化學(xué)組分特征和顯微組分特征,依據(jù)其揮發(fā)分質(zhì)量比和鏡質(zhì)組平均最大反射率可知煤樣變質(zhì)程度均較低。對(duì)煤樣進(jìn)行低溫氮吸附實(shí)驗(yàn)測(cè)試,測(cè)得吸附量隨相對(duì)壓力的變化關(guān)系即為實(shí)驗(yàn)煤樣的吸附等溫線,依據(jù)吸附等溫線形態(tài)可知實(shí)驗(yàn)煤樣吸附孔以一端開口的圓筒形孔和一端封閉的平板形孔為主。根據(jù)氣體吸附理論,采用相應(yīng)的模型計(jì)算煤樣的平均孔隙直徑和孔徑分布特征等結(jié)構(gòu)特征參數(shù)。分析結(jié)果表明,煤樣吸附孔的比表面積以過渡孔為主,孔隙體積以過渡孔和中孔為主。根據(jù)吸附量和相對(duì)壓力的關(guān)系,利用FHH模型計(jì)算煤樣的吸附孔表面分形維數(shù),結(jié)果表明實(shí)驗(yàn)煤樣在研究尺度范圍內(nèi)分形特征明顯,煤樣的化學(xué)組分和吸附孔結(jié)構(gòu)參數(shù)等均對(duì)吸附孔分形維數(shù)的大小有一定影響。通過煤樣的瓦斯放散初速度實(shí)驗(yàn),得到煤樣的瓦斯放散初速度和放散量,利用Knudsen數(shù)判斷實(shí)驗(yàn)煤樣吸附孔內(nèi)的瓦斯放散模式。通過擬合分析可知,煤樣的瓦斯放散初速度與孔隙結(jié)構(gòu)特征參數(shù)和分形維數(shù)均存在一定的線性關(guān)系。實(shí)驗(yàn)范圍內(nèi)10s時(shí)固定空間內(nèi)的瓦斯放散量與吸附孔結(jié)構(gòu)特征參數(shù)和分形維數(shù)均無明顯線性關(guān)系,60 s時(shí)固定空間內(nèi)的瓦斯放散量與吸附孔平均孔隙直徑呈線性正相關(guān),與吸附孔表面分形維數(shù)呈線性負(fù)相關(guān),與吸附孔比表面積和體積無明顯線性關(guān)系。
[Abstract]:Xinjiang is rich in coal resources and complicated in coal seam conditions. As one of the important coal production bases, Fukang mining area has superior resource conditions. This paper studies the characteristics of adsorption hole and gas release of low-rank coal in Fukang mining area, and the relationship between the characteristics of adsorption hole and gas emission. It can provide the basis for gas disaster prevention and coalbed methane extraction and utilization during mine production. This paper selects coal samples from eight typical coal mines in Fukang mining area, Xinjiang, to carry out experimental research. The macroscopic physical properties of experimental coal samples are basically similar. The chemical and maceral characteristics of coal samples are obtained by industrial and maceral analysis experiments. According to the mass ratio of volatile matter and the average maximum reflectance of vitrinite, the metamorphic degree of coal sample is low. According to the adsorption isotherm morphology, the experimental coal sample adsorption holes are mainly cylindrical holes with one end opening and flat plate holes with one end closed. According to the gas adsorption theory, The structural parameters such as average pore diameter and pore size distribution characteristics of coal samples are calculated by using the corresponding model. The results show that the specific surface area of adsorption pores of coal samples is mainly transition pore. The pore volume is mainly transition pore and mesopore. According to the relation between adsorption quantity and relative pressure, the fractal dimension of adsorption pore surface of coal sample is calculated by FHH model. The results show that the fractal characteristics of experimental coal sample are obvious in the study scale. The chemical composition of coal sample and the structure parameters of adsorption pore have certain influence on the fractal dimension of adsorption pore. The Knudsen number is used to judge the gas release model in the adsorption hole of the experimental coal sample. There is a linear relationship between the initial velocity of gas release and the characteristic parameters of pore structure and fractal dimension. There is no relationship between the gas emission and the characteristic parameters and fractal dimension of the pore structure in the fixed space of 10 s in the experimental range. There is a linear positive correlation between the amount of gas emission in the fixed space and the average pore diameter of the adsorption pore at 60 s. There is a linear negative correlation with the fractal dimension of the adsorption pore surface, but no obvious linear relationship with the specific surface area and volume of the adsorption pore.
【學(xué)位授予單位】：西安科技大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TD712

【參考文獻(xiàn)】

相關(guān)期刊論文 前10條

1 李明;姜波;秦勇;劉杰剛;;構(gòu)造煤中礦物質(zhì)對(duì)孔隙結(jié)構(gòu)的影響研究[J];煤炭學(xué)報(bào);2017年03期

2 Qi Lingling;Tang Xu;Wang Zhaofeng;Peng Xinshan;;Pore characterization of different types of coal from coal and gas outburst disaster sites using low temperature nitrogen adsorption approach[J];International Journal of Mining Science and Technology;2017年02期

3 鄒俊鵬;陳衛(wèi)忠;楊典森;于洪丹;譚賢君;;基于SEM的琿春低階煤微觀結(jié)構(gòu)特征研究[J];巖石力學(xué)與工程學(xué)報(bào);2016年09期

4 任嚴(yán);崔海軍;劉長(zhǎng)雄;石小軍;;新疆阜康礦區(qū)煤層氣井壓裂施工方案淺析[J];石化技術(shù);2015年07期

5 祁斌;;阜康礦區(qū)煤層氣開發(fā)地質(zhì)特征與鉆井選型[J];中國(guó)煤層氣;2015年03期

6 王健;;煤粒瓦斯放散數(shù)學(xué)模型及數(shù)值模擬[J];煤炭學(xué)報(bào);2015年04期

7 李子文;郝志勇;龐源;高亞斌;;煤的分形維數(shù)及其對(duì)瓦斯吸附的影響[J];煤炭學(xué)報(bào);2015年04期

8 韓貝貝;秦勇;張政;汪崗;喻鵬;;基于壓汞試驗(yàn)的煤可壓縮性研究及壓縮量校正[J];煤炭科學(xué)技術(shù);2015年03期

9 李樂;田繼軍;楊曙光;傅雪海;李展峰;;新疆阜康礦區(qū)瓦斯賦存影響因素分析[J];煤礦安全;2015年03期

10 鄭慶榮;劉鴻福;李偉;要惠芳;閻紀(jì)偉;;煤孔隙結(jié)構(gòu)構(gòu)造變形的壓汞法和小角X射線散射表征[J];中國(guó)礦業(yè);2015年01期

相關(guān)博士學(xué)位論文 前1條

1 劉彥偉;煤粒瓦斯放散規(guī)律、機(jī)理與動(dòng)力學(xué)模型研究[D];河南理工大學(xué);2011年

相關(guān)碩士學(xué)位論文 前4條

1 黎珊珊;新疆煤炭資源開發(fā)的產(chǎn)地回補(bǔ)制度研究[D];新疆財(cái)經(jīng)大學(xué);2014年

2 劉小輝;阜康礦區(qū)H_2S異常煤礦地質(zhì)控制因素分析[D];新疆大學(xué);2014年

3 劉正;低滲透煤層微觀孔隙結(jié)構(gòu)研究及應(yīng)用[D];西安科技大學(xué);2013年

4 帕提古麗·斯地克;準(zhǔn)噶爾盆地阜康礦區(qū)瓦斯地質(zhì)規(guī)律研究[D];新疆大學(xué);2012年

，

本文編號(hào)：1636867