胜利褐煤在合成气/复合溶剂体系下液化性能研究

Shengli lignite liquefaction under syngas and complex solvent

    摘要
  • 摘要: 在合成气(H2+CO)/复合溶剂(THN+H2O) 体系和氢气/四氢萘(H2/THN) 体系下考察了胜利褐煤液化性能, 并对液化产物沥青烯和前沥青烯进行了红外光谱分析.结果表明, 合成气/复合溶剂体系下胜利褐煤液化转化率和油产率显著高于H2/THN体系, 当反应条件为H2:CO=1:1(体积比)、THN:H2O=1:1(体积比)、反应温度400℃、初压4MPa、时间30min、催化剂添加量3%(Fe的质量计) 和硫铁原子比1.2时, 胜利褐煤液化转化率和油产率分别为88.79%和55.47%, 比H2/THN体系分别高出8.00%和7.54%.据此表明, 在合成气/复合溶剂体系下, 水煤气变换反应产生的氢活性更高, 对煤和液化产物前沥青烯具有更好的加氢效果, 同时四氢萘的存在稳定了煤热解自由基和溶解分散液化重质产物沥青烯和前沥青烯, 这些因素的协同作用提高了煤液化转化率和油产率.实验表明, 合成气/复合溶剂体系是一种新的褐煤直接液化技术.

     

    Abstract: The liquefaction of Shengli lignite (SL) were studied in the system of syngas (H2+CO) and complex solvent (H2O+THN) and the system of hydrogen (H2) and tetralin (THN). Asphaltene (AS) and preasphaltene (PA) from the two systems were characterized by FT-IR. The results show that both conversion and oil yield of Shengli lignite liquefaction in the (H2+CO)/(H2O+THN) system are significantly higher than those in the H2/THN system. The conversion and oil yield under syngas (H2:CO=1:1) and complex solvent (THN:H2O=1:1) reach respectively 88.79% and 55.47% at 400℃, 4MPa and 30min. The differences in the conversion and oil yield between the (H2+CO)/(H2O+THN) and H2/THN systems are 8.00% and 7.54%, respectively. This suggests that the water-gas shift reaction can produce active hydrogen in the (H2+CO)/(H2O+THN) system, which benefits the hydrogenation of SL and PA. Meanwhile, THN can stabilize the free radicals from SL pyrolysis and dissolve the products (AS and PA) from SL liquefaction. The synergistic effect of two factors results in the improvement of conversion and oil yield. This study shows that it is a new lignite liquefaction technology using the (H2+CO)/(H2O+THN) system.

     

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