Experimental and kinetic study of steam gasification of low-rank coal in molten blast furnace slag
Experimental and kinetic study of steam gasification of low-rank coal in molten blast furnace slag
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DOI：
10.1016/j.energy.2016.06.052
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发表时间：
2016-09
期刊：
影响因子：
9
通讯作者：
Wenjun Duan;Q. Yu;Junxiang Liu;Tianwei Wu;Fan Yang;Q. Qin
中科院分区：
文献类型：
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作者：
Wenjun Duan;Q. Yu;Junxiang Liu;Tianwei Wu;Fan Yang;Q. Qin
以德州低阶煤为原料，在实验室连续气化装置上进行了高炉熔渣水蒸气气化等温试验，考察了气化过程及合成气的生成情况。结果表明，熔融BFS提供了气化反应所需的热量，确保气化成功。碳转化率（CE）、冷气化率（CGE）和可燃气率分别大于85%、100%和87%。同时，通过热重动力学实验研究了BFS在低阶煤气化过程中的作用。研究发现，以BFS为热载体，一定时间内的碳转化率明显增强。在此条件下，煤的反应性指数也有所提高。在1673 K时，水煤比（S/C）为1：2的煤的反应性指数比水煤比（S/C）为1：0的煤的反应性指数高1.98倍。DZ低阶煤的最可几动力学模型由D2模型转变为A2模型。在低阶煤气化过程中，BFS不仅是热载体，而且是活性催化剂。最后，对高炉煤气作为热载体的催化气化机理进行了初步探讨。
In this study, the isothermal tests for steam gasification of Dezhou (DZ) low-rank coal with molten blast furnace slag (BFS) were performed in a lab-scale continuous gasification system, to investigate the status of gasification and syngas production. The results showed that molten BFS provided the heat needed for gasification reaction to ensure gasification is successful. The carbon conversion efficiency (CE), cold gasification efficiency (CGE) and percentage of combustible gas were higher than 85%, 100% and 87%, respectively. Meanwhile, thermo-gravimetric kinetic experiments were conducted to obtain the role of BFS in low-rank coal gasification. The study found that carbon conversion at a certain time was significantly enhanced with BFS as heat carrier. The reactivity index of coal was also improved under this condition. The reactivity index of coal with steam to coal (S/C) ratio of 1:2 was approximately 1.98 times higher than that with S/C ratio of 1:0 at 1673 K. The most probable kinetic mechanism model of DZ low-rank coal turned from D2model to A2model. Not only was BFS the heat carrier, but also it was the active catalyst in low-rank coal gasification. Eventually, the catalytic mechanism of coal gasification using BFS as heat carrier was schematically proposed.