煤拔头烟煤焦的物质组成及碳结构

Substance Composition and Carbon Structure of Coal-topping Bituminous-coal Coke

以3种粒径大同烟煤(DT60、DT80、DT100)为原料,在喷动载流床上分别制备了4种热解温度(550、650、750和850℃)的拔头半焦,采用工业分析、红外光谱分析以及X射线衍射分析法对拔头半焦的物质组成和碳结构进行了测试。结果表明,拔头半焦的物质组成和碳结构与原煤热解度(DV)有关。DV随热解温度、升温速率和停留时间增加而增加,不同粒径原煤在同一热解温度下的DV大小排序基本为DV,DT60>DV,DT100>DV,DT80;拔头半焦的挥发分含量随DV升高而降低,燃料比随DV升高而升高;对大同烟煤,在DV大于0.55时,芳香结构有明显缩聚反应,半焦碳结构也出现明显有序化现象。

With Da-tong originated bituminous coal in three particle diameters(DT60,DT80 and DT100) serving as the raw material,the coal-topping semi-cokes at four pyrolysis temperatures(550,650,750 and 850 ℃) were prepared respectively on a spouted-entrained bed.The industrial analytic,infrared spectrum analytic and X-ray diffraction analytic methods were used to test the substance composition and carbon structure of the coal-topping semi-cokes.It has been found that the substance composition and carbon structure of the coal-topping semi-cokes are related to its raw coal hypolysis degree(DV),which will increase with an increase of the hypolysis temperature,temperature rise speed and residence time.The order of DV magnitudes of raw coal in different particle diameters at a same pyrolysis temperature is basically as follows:DV,DT60>DV,DT100>DV,DT80.The volatile content of the coal-topping semi-coke decreases and the fuel ratio increases with an increase of DV.For Da-tong originated coal,when DV is greater than 0.55,the fragrant structure features a conspicuous condensation polymerization reaction and the semi-coke structure also exhibits an obvious sequence phenomenon.