中文摘要：

以N-甲基吡咯烷酮为溶剂,380℃下分别萃取褐煤、长焰煤、气煤和肥煤制备无灰煤.通过元素、红外、热重分析及常温分级萃取实验考察无灰煤的化学结构变化,在唐山1/3焦煤中添加10%无灰煤,研究煤阶对无灰煤配煤效果的影响.结果表明：相比原煤,无灰煤烃类增多,黏结性增强,以非黏结性煤为原料所得的无灰煤黏结指数可达90以上.随着原煤煤阶升高,无灰煤脂肪烃和含氧物质减少,芳烃增多,平均分子量增大,热失重减少.在唐山1/3焦煤中配入无灰煤,混煤软化点降低,热塑性随无灰煤原煤煤阶提高而增强.

英文摘要：

Hypercoal was extracted by NMP at 380 ℃ from lignite, long flame coal, gas coal and fat coal. The structural changes of hypercoal were characterized by means of ultimate analysis, FTIR, TG and the classified extraction test at room temperature. The effect of coal rank on the thermoplasticity of hypercoal was studied by TG and Gieseler fluidity test. The re- suits showed that, compared to raw coal, there is more hydrocarbons in hypereoal, so it has bet- ter thermoplasticity and caking ability. The caking index of hypereoal from non-caking coal can reach 90 or more. With the increase of raw coal rank, the aliphatic hydrocarbons and oxygen-con- taining materials in hypercoal reduced, aromatics increased, average molecular weight get larger, weight loss reduced. Blending hypercoal which prepared from low rank coal into Tangshan 1/3 coke coal, the softening point of mixed coal reduced, and the thermoplasticity of mixed coal im- proved with the rise of coal rank of hypercoal.