热处理胜利褐煤水分吸附的结合作用及影响因素分析
发布时间：2019-06-21 20:09
【摘要】：本文以胜利褐煤为研究对象,基于其极易吸附水分的特点,为高效清洁利用褐煤资源做基础研究。通过不同温度对胜利褐煤进行热处理后,在不同时间及相对湿度下进行水分吸附,通过低场-1H核磁技术、热重分析、原位红外分析、X射线衍射(XRD)技术对褐煤结合水分过程及特点进行分析,探讨褐煤表面与水分的结合方式及结合作用。主要研究工作及成果如下:结果表明,褐煤吸附水分越多,其表面与水分的结合作用越弱,水分越少其结合作用越强,从脱附过程和原位红外测试也可以发现,大部分水分在80℃前脱除,说明结合较弱,而强结合水分占少数,脱附所需温度较高,随着水分的减少,氢键相对含量逐渐增加后又减少,也说明水分越少结合作用越强,直到水分完全脱除表现出褐煤表面原有氢键。其次,褐煤吸附水分存在多种状态,水分状态不受褐煤热处理温度的影响,分为强结合水分,较强结合水分以及弱结合水分,且强吸附水分主要受含氧官能团影响,当水分越多时,就有越多的水分与含氧官能团结合,而非含氧官能团主要与褐煤碳微晶结构即芳香结构有关,其属于疏水性结合位点,结合作用较弱。研究官能团与水分的结合作用发现,羟基,羧基,酮基均能与水分形成较强的氢键,其中羟基与水分的结合作用最强,且羟基吸附水分的能力最强,同样反映出褐煤中含氧官能团也与水分存在此种关系,由于热处理褐煤在500℃以后基本没有羧基与酮基,与水分结合的主要是羟基,所以导致热处理褐煤吸附水分的主要因素是羟基的存在。
[Abstract]:In this paper, Shengli lignite is taken as the research object, and based on its easy adsorption of water, the basic research is made for the efficient and clean utilization of lignite resources. After heat treatment of Shengli lignite at different temperatures, water adsorption was carried out at different time and relative humidity. The water binding process and characteristics of lignite were analyzed by low field 1H NMR, thermogravimetric analysis, in situ infrared analysis and X ray diffraction (XRD). The binding mode and binding effect of lignite surface and moisture were discussed. The main research work and results are as follows: the more moisture is adsorbed by lignite, the weaker the binding effect between surface and moisture is, and the stronger the binding effect is. From the desorption process and in situ infrared test, it can also be found that most of the moisture is removed before 80 鈩，
本文编号：2504317
[Abstract]:In this paper, Shengli lignite is taken as the research object, and based on its easy adsorption of water, the basic research is made for the efficient and clean utilization of lignite resources. After heat treatment of Shengli lignite at different temperatures, water adsorption was carried out at different time and relative humidity. The water binding process and characteristics of lignite were analyzed by low field 1H NMR, thermogravimetric analysis, in situ infrared analysis and X ray diffraction (XRD). The binding mode and binding effect of lignite surface and moisture were discussed. The main research work and results are as follows: the more moisture is adsorbed by lignite, the weaker the binding effect between surface and moisture is, and the stronger the binding effect is. From the desorption process and in situ infrared test, it can also be found that most of the moisture is removed before 80 鈩，
本文编号：2504317
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