先锋褐煤在水热处理过程中的结构演绎
发布时间：2019-02-09 07:27
【摘要】：以先锋褐煤(XF)为原料,在高压反应釜中考察了水热处理过程中褐煤的结构变化,通过13C固体核磁共振(NM R)和傅里叶变换红外光谱进行了分析表征。结果表明,在低于240℃的水热处理条件下,煤有机分子结构中的弱化学键有一定断裂,含氧官能团逐步减少;水中氢以离子形态迁移至褐煤中,处理后褐煤结构中甲基比例先增加后减少,次甲基比例由原煤的4.80%增加至XF-240的13.16%;释放的气体中主要是CO_2,烃类气体组分随处理温度的升高略有增加。当水热处理温度高于240℃时,褐煤中部分共价键开始断裂,释放的烃类气体(C1-4)由240℃时的2.13%增加至300℃时的8.59%,脂肪碳比例由XF-240的44.83%降低至XF-300的39.49%,与氧连接的碳比例由XF-240的12.57%降低至XF-300的1.49%。水热处理对褐煤的脱氧提质效果显著,300℃时氧含量降低约30%,芳香碳比例增加至60.50%,比原煤提高19%。
[Abstract]:The structural changes of lignite during hydrothermal treatment were investigated in a high-pressure reactor using Xianfeng lignite (XF) as raw material. The structure was characterized by 13C solid nuclear magnetic resonance (NMR) (NM R) and Fourier transform infrared spectroscopy (FTIR). The results show that the weak chemical bonds in the organic molecular structure of coal are broken and the oxygen functional groups are gradually reduced under the hydrothermal treatment condition of less than 240 鈩，
本文编号：2418845
[Abstract]:The structural changes of lignite during hydrothermal treatment were investigated in a high-pressure reactor using Xianfeng lignite (XF) as raw material. The structure was characterized by 13C solid nuclear magnetic resonance (NMR) (NM R) and Fourier transform infrared spectroscopy (FTIR). The results show that the weak chemical bonds in the organic molecular structure of coal are broken and the oxygen functional groups are gradually reduced under the hydrothermal treatment condition of less than 240 鈩，
本文编号：2418845
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