本文選題：大佛寺4~#煤 + 潤濕性��； 參考：《西安科技大學(xué)》2017年碩士論文

【摘要】：煤的潤濕性是指煤吸附液體的一種能力,其潤濕性的大小在生產(chǎn)生活中影響深遠(yuǎn)。例如在煤礦開采中產(chǎn)生的煤塵,用普通的水溶液噴霧降低效率差,原因在于煤的潤濕性差,不易被水潤濕。了解研究區(qū)煤的潤濕性,以及找到可以改變水溶液的表面活性劑,對礦井生產(chǎn)有著很大的幫助。本文首先對研究區(qū)的煤質(zhì)進(jìn)行了研究。通過煤巖分析和工業(yè)分析結(jié)果,判定大佛寺4#煤為不黏煤;屬于特低灰,中高級揮發(fā)煙煤;與相同等級的煤對比來看,大佛寺地區(qū)煤的水分和固定碳含量都比較高;元素分析發(fā)現(xiàn)大佛寺4#煤的碳元素含量(83.61%)相對同等級煙煤較高,氧元素含量為10.15%,氫元素含量為4.75%,氮元素含量為0.83%;鏡煤中的碳元素含量(78.70%)小于暗煤的碳元素含量(83.16%),而其余氫元素、氧元素、氮元素的含量,鏡煤都大于暗煤。其次,對煤的孔隙特征和比表面積特征進(jìn)行研究。壓汞實(shí)驗(yàn)和液氮吸附實(shí)驗(yàn)結(jié)果表明,大佛寺4#煤鏡煤的比表面積大于暗煤的比表面,4#煤比表面積介于鏡煤和暗煤之間;鏡煤的孔容(孔體積)、平均孔喉半徑(平均孔徑)大于暗煤;與暗煤相比,鏡煤的分選性更差,孔喉分布不均勻,整體偏粗,整體連通性不好;鏡煤表面因碎屑限制,導(dǎo)致屑間孔連通性差;暗煤表面有高嶺石出現(xiàn),并具有相互垂直的張性裂隙,從而整體的連通質(zhì)量優(yōu)良;鏡煤和暗煤的孔隙中都含有少量的墨水瓶孔(細(xì)瓶頸的孔)。最后對潤濕性進(jìn)行測定。煤水(煤與蒸餾水)界面的接觸角測定結(jié)果表明,接觸角從小到大依次為:暗煤面垂直層理面斜切層理面平行層理面鏡煤面;非離子型表面活性劑6501在溶液濃度為1.6%時,大佛寺4#煤的平行層理,垂直層理,斜切層理,鏡煤面和暗煤面的接觸角基本降為原來的二分之一左右;潤濕反轉(zhuǎn)劑g502在溶液濃度為0.1%時,就可將接觸角增加到原來的1.6倍左右;潤濕效果并不會隨著加入潤濕劑溶液濃度的增加而線性增加,而是會在一定濃度范圍內(nèi)出現(xiàn)臨界膠束濃度(CMC);因此,在考慮加入潤濕劑之前,最好將濃度設(shè)計在臨界膠束濃度之外,避免其影響。
[Abstract]:The wettability of coal refers to the ability of coal to adsorb liquid, and its wettability has a profound influence in production and life. For example, the coal dust produced in coal mining reduces the efficiency by common water spray, because the wettability of coal is poor, it is not easy to be wetted by water. Understanding the wettability of coal in the study area and finding surfactants that can change aqueous solution are of great help to mine production. In this paper, the coal quality in the study area is studied. According to the results of coal and rock analysis and industry analysis, it is determined that Dafosi-coal is non-caking coal, belongs to very low ash, middle and high grade volatile bituminous coal, and compared with the same grade coal, the moisture and fixed carbon content of coal in Dafosi area are relatively high. Element analysis showed that the content of carbon element in Dafusi coal (83.61) was higher than that of bituminous coal of the same grade, oxygen content was 10.15, hydrogen element content was 4.75m, nitrogen element content was 0.83.The carbon element content in mirror coal was 78.70%) lower than that in dark coal (83.161.The rest of hydrogen element was found to be lower than that of dark coal). The content of oxygen element, nitrogen element and mirror coal are higher than that of dark coal. Secondly, the pore characteristics and specific surface area characteristics of coal are studied. The results of mercury injection experiment and liquid nitrogen adsorption test show that the specific surface area of Dafusi coal mirror coal is larger than that of dark coal. The specific surface area of coal is between mirror coal and dark coal. The pore volume (pore volume) of vitrinite is larger than that of dark coal. Compared with dark coal, the separation of vitrinite is worse, the pore throat is uneven, the whole is coarse, and the overall connectivity is not good. The surface of mirror coal is restricted by debris. It leads to poor connectivity between cuttings, kaolinite appearing on the surface of dark coal, and vertical tensile fractures to each other, so that the overall quality of connectivity is good. The pores of mirror coal and dark coal contain a small amount of ink bottle holes (fine bottleneck holes). Finally, wettability was determined. The results of measurement of contact angle between coal and distilled water show that the contact angle is from small to large as follows: dark coal surface vertical bedding surface, oblique bedding surface, parallel stratified surface mirror surface, Nonionic surfactant 6501, when the solution concentration is 1.6, The parallel bedding, vertical bedding, oblique bedding, contact angle between mirror coal surface and dark coal surface are reduced to about 1/2, and the wetting reversal agent g502 is about 0.1 when the solution concentration is 0.1. The contact angle can be increased to about 1.6 times of the original, and the wetting effect will not increase linearly with the increase of the concentration of the wetting agent solution, but the critical micelle concentration will appear in a certain range of concentration; therefore, the wetting effect will not increase linearly with the increase of the concentration of the wetting agent solution. Before adding wetting agent, it is better to design the concentration beyond the critical micelle concentration to avoid its influence.
【學(xué)位授予單位】：西安科技大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TD714

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