Penetration Effect of Injected Gas at Shaft Gas Injection in Blast Furnace Analyzed by Hybrid Model of DEM-CFD
Penetration Effect of Injected Gas at Shaft Gas Injection in Blast Furnace Analyzed by Hybrid Model of DEM-CFD
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DOI：
10.2355/isijinternational.51.1410
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发表时间：
2011-08
影响因子：
1.8
通讯作者：
S. Natsui;S. Ueda,;H. Nogami;J. Kano;R. Inoue;T. Ariyama
中科院分区：
文献类型：
--
作者：
S. Natsui;S. Ueda,;H. Nogami;J. Kano;R. Inoue;T. Ariyama
高炉竖井喷吹还原性气体是大幅度降低钢厂CO2排放的有利途径之一，该方法用于炉顶煤气回收和氧气高炉工艺。在这些过程中，从辅助风口注入气体的穿透效应对于实现有效瓦斯还原或弥补上部的热平衡具有重要意义，因此分析注入竖井的气体的动态行为是有用的。在本研究中，通过离散元法（DEM）和连续介质模型（CFD）的混合模型对注入气体的渗透效应进行了三维模拟。特别是，利用CFD模型对DEM计算出的动态气体流动和炉料层压力分布进行了定量分析。虽然由于气体水平惯性力不足，副风口注入气体的影响区域被限制在特定区域，但随着副风口气体速度的增加，穿透区域逐渐扩大。在小型高炉中，喷射气体可以以较高的气体速度轻松到达中心，并且表明喷射气体的相对穿透深度取决于高炉的内部容积。然而，注入气体的整体行为没有显示出任何显着的变化。综上所述，竖井气体穿透面积与竖井气体与常规风口向上气体的比例几乎成正比。
Shaft gas injection of reducing gas in the blast furnace is one of favorable ways to greatly decrease CO2 emissions from steel works, and this approach is used for the top gas recycling and oxygen blast furnace processes. In these processes, the penetration effect of the gas injected from the auxiliary tuyeres is important for attaining effective gas reduction or making up the heat balance in the upper part, and so it is useful to analyze the dynamic behavior of the gas injected into the shaft. In the present study, the penetration effect of injected gas was three-dimensionally simulated by a hybrid model of the discrete element method (DEM) and continuum model (CFD). In particular, the CFD model was used to quantitatively analyze the dynamic gas flow and the pressure distribution in the burden layers calculated by DEM. Although the area influenced by the injected gas from the auxiliary tuyeres was restricted to a specific area due to insufficient horizontal inertial force of the gas, the penetration area gradually enlarged as the gas velocity from the auxiliary tuyeres increased. In a small blast furnace, the injected gas can easily reach the center with the higher gas velocity, and it was shown that the relative penetration depth of the injected gas depends on the inner volume of the blast furnace. However, the overall behavior of the injected gas did not show any remarkable change. In conclusion, the penetration area of shaft gas was almost proportional to the ratio of shaft gas and the upward gas from the conventional tuyeres.