A drainage model of a multi-taphole hearth of a (large) blast furnace operated by alternate tappings has been developed. The model, which is based on a simplified treatment of the pressure losses in the dead man, taphole entrance and taphole, can estimate the liquid levels and outflow rates of the two liquid phases in quasi-stationary and dynamic states. The sensitivity of the results to changes in the conditions, such as taphole length and diameter, dead-man porosity, as well as in the model parameters is illustrated. The effect of asymmetric conditions at the two tapholes, and dynamic responses of particular interest are also illustrated and discussed. The results of the model are finally compared with findings from a reference blast furnace where the outflows rates of iron and slag are routinely estimated, demonstrating that several of the typical outflow patterns observed in the furnace can be at least quantitatively reproduced. This demonstrates the feasibility of the model as a tool for gaining deeper insight into the complex drainage with alternating tappings and the evolution of the liquid levels in the hearth of large blast furnaces.

中文翻译：

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多孔高炉排水模型

已经开发了由交替出钢操作的（大型）高炉的多出钢孔炉膛的排水模型。该模型基于对死人、出铁口入口和出铁口压力损失的简化处理，可以估计准静态和动态两种液相的液位和流出速度。说明了结果对条件变化的敏感性，例如出铁口长度和直径、死人孔隙率以及模型参数。还说明和讨论了两个出铁口处不对称条件的影响，以及特别感兴趣的动态响应。该模型的结果最终与参考高炉的结果进行比较，在该高炉中，铁和渣的流出率是常规估计的，证明在熔炉中观察到的几种典型流出模式至少可以定量再现。这证明了该模型作为一种工具的可行性，可以更深入地了解具有交替出钢的复杂排水和大型高炉炉膛液位的演变。