【摘要】：以先鋒褐煤(XF)為原料,在高壓反應(yīng)釜中考察了水熱處理過程中褐煤的結(jié)構(gòu)變化,通過13C固體核磁共振(NM R)和傅里葉變換紅外光譜進(jìn)行了分析表征。結(jié)果表明,在低于240℃的水熱處理?xiàng)l件下,煤有機(jī)分子結(jié)構(gòu)中的弱化學(xué)鍵有一定斷裂,含氧官能團(tuán)逐步減少;水中氫以離子形態(tài)遷移至褐煤中,處理后褐煤結(jié)構(gòu)中甲基比例先增加后減少,次甲基比例由原煤的4.80%增加至XF-240的13.16%;釋放的氣體中主要是CO_2,烴類氣體組分隨處理溫度的升高略有增加。當(dāng)水熱處理溫度高于240℃時(shí),褐煤中部分共價(jià)鍵開始斷裂,釋放的烴類氣體(C1-4)由240℃時(shí)的2.13%增加至300℃時(shí)的8.59%,脂肪碳比例由XF-240的44.83%降低至XF-300的39.49%,與氧連接的碳比例由XF-240的12.57%降低至XF-300的1.49%。水熱處理對(duì)褐煤的脫氧提質(zhì)效果顯著,300℃時(shí)氧含量降低約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，

本文編號(hào)：2418845