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通过模拟高炉实际条件,研究了温度、富碱条件等对五种捣固焦气化反应的影响,并结合光学组织和微观气孔结构分析了捣固焦在高温下的碳溶反应规律。实验结果表明,反应温度升高和富碱均能较大地提高捣固焦气化反应失碳率。不富碱时,捣固焦气化反应失碳率随温度升高先缓慢增长而后急剧升高,在1000℃以下时反应较少;富碱后,四种捣固焦失碳率随温度升高先急剧升高而后趋于平稳,在1100℃时已达到最大值。捣固焦内部闭气孔比例较大,大气孔较少,微小气孔较多,局部存在盲肠状气孔,反应后大气孔和贯穿孔数量增加。除反应性最低的捣固焦A外,其他四种捣固焦以基础各向异性和粗粒镶嵌结构为主,在1000℃和1100℃时抗碱金属侵蚀能力较差.
By simulating the actual conditions of blast furnace, the effects of temperature and alkali-rich conditions on the gasification reaction of five tamping coke were studied. The carbon dissolution reaction law of tamping coke at high temperature was analyzed combining optical microstructure and microscopic pore structure. The experimental results show that the reaction temperature and alkali-rich can greatly increase the carbon loss of tamping coke gasification reaction. In the non-alkali-rich, the carbon loss rate of tamping pyrolysis reaction firstly increased slowly with the increase of temperature and then increased sharply, and the reaction was less under 1000 ℃. After alkali-rich, the carbon loss rate of four tamping coke increased with temperature The height of the first sharp rise and then stabilized, at 1100 ℃ has reached its maximum. There is a large proportion of closed stomata inside the tamping coke, with fewer air holes, more micro stomata, and cecal-like stomata locally. After the reaction, the number of air holes and through-holes increases. In addition to the lowest reactivity tamping coke A, the other four tamping coke based on the basic anisotropic and coarse inlaid structure, at 1000 ℃ and 1100 ℃ less alkali corrosion resistance.