煤溶胀前后溶解度参数变化研究?

Solubility variation of coal during swelling processes

选择6种性质不同的溶剂作为溶胀剂,对烟煤进行了溶胀预处理。对溶胀前后煤样进行了形貌分析、红外分析及溶解度参数测定,并考察了直接加氢液化效果。结果表明,溶剂溶胀预处理未破坏煤大分子结构,而煤的微观形貌变得疏松。所选6种溶剂中,N,N-二甲基甲酰胺(DMF)与煤二者之间的溶解度参数差值最小,DMF对煤溶胀效果也最好,溶胀度达1.71。同时,6种溶胀煤中,经DMF溶胀煤样(C_(DMF))的溶解度参数值最低,直接液化性能最好。相比于原煤(C_R),C_(DMF)的溶解度参数降低了2.73%,气产率降低了89.71%,液产率和转化率分别提高了27.48%和5.35%。

Six different solvents were used as swelling agents to pretreat bituminous coal. The coal before and after treatments was characterized by SEM, FTIR and solubility measurements, and liquefaction experiments were also performed on raw coal (CR) and six swollen coals. The results show that swelling can expand coal structure, although FTIR results indicate that coal microstructure is not broken. The solubility difference between N,N-dimethylformamide (DMF) and CR is the smallest for the six solvents used, and DMF has the best swelling effect with swelling degree of 1.71. In addition, the solubility of CDMF is the lowest among the six swollen coals with the best direct liquefaction performance. Compared with CR, the solubility of CDMF decreases by 2.73%, gas yield decreases by 89.71%, and the liquid yield and conversion rate increase by 27.48% and 5.35%, respectively.