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采用液相吸附法研究了不同温度、富锌量等条件对捣固焦和顶装焦气化反应的影响,并结合XRD、扫描电子显微镜和光学显微镜对比分析了锌对2种焦炭气化反应后的微晶结构、显微结构、孔结构的影响。研究结果表明,升高温度和增大富锌量均能使焦炭反应性增大,反应后焦炭强度减小。反应温度低于1 000℃时,锌对焦炭气化反应的影响较小,而在1 100℃时,2种焦炭的反应率随富锌浓度的增大快速增大,且富锌后顶装焦的反应率比捣固焦高约1%~2%。XRD分析表明,锌对焦炭有序化微晶气化反应的催化作用大于无序化微晶,从而导致气化反应后焦炭微晶片层的堆积高度减小,石墨化程度降低。结合扫描电子显微镜和光学显微全景图发现,锌在催化焦炭气化反应过程中孔壁变薄甚至消失,孔面积和孔直径增大,孔的贯穿连通程度加大,为锌蒸气的渗透和气化反应的动力学提供有利条件,导致反应进一步被加剧,但捣固焦较致密的孔结构使其在气化反应中具有优于顶装焦的抗锌催化能力。
The influence of different temperature, zinc content and other conditions on tamping coke and top coke gasification reaction was studied by liquid phase adsorption method. Combined with XRD, SEM and optical microscope, the effects of zinc on two coke gasification reactions After the microcrystalline structure, microstructure, pore structure. The results show that both the increase of temperature and the increase of zinc content can increase the coke reactivity and reduce the coke strength after the reaction. When the reaction temperature is lower than 1 000 ℃, the effect of zinc on the gasification reaction of coke is small. At 1 100 ℃, the reaction rate of two coke increases rapidly with the increase of zinc concentration, Coke reaction rate than tamping coke about 1% ~ 2%. XRD analysis shows that the catalytic effect of zinc on coke ordered microcrystal gasification is greater than that of disordered crystallite, resulting in a decrease in the heap height and a decrease in the degree of graphitization of the coke microcrystalline sheet after the gasification reaction. Combined with scanning electron microscopy and optical microscopy, it was found that the pore wall became thinner and even disappear during the catalytic coke gasification reaction, the pore area and pore diameter increased, and the penetrating and communicating degree of pore increased, which was the result of zinc vapor infiltration and gas Kinetics of the reaction provide favorable conditions leading to further aggravation of the reaction, but tamping of the coarser pore structure gives it a zinc-resistant catalytic capability that is superior to top-loading coke in the gasification reaction.