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首页> 外文会议>The 4th Australia-China-Japan joint symposium on iron and steelmaking >Experimental and Calculation Analysis on Characteristics of Combustion Jets
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Experimental and Calculation Analysis on Characteristics of Combustion Jets

机译：燃烧喷嘴特性的实验与计算分析

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For stable production of high-grade steel,it is necessary to improve the efficiency and productivity of refining processes.Moreover,appropriate evaluation of the top-blowing conditions is essential for optimizing BOF operation.Increase in the flow rate of top-blown oxygen is necessary to minimize process time and improve productivity.In addition,it is particularly important to know the post-combustion behavior to improve heat utilization efficiency.In this study,the effect of top-blowing condition of oxygen jet on the post-combustion behavior was studied.In this study,oxygen jet behavior in a combustion field was investigated by computational fluid dynamics (CFD).First,the accuracy of the CFD simulation model was evaluated by comparison with a combustion experiment Then,the effect of the combustion on the characteristics of a top-blown jet was studied using the model.As a result,the CO and CO2 mole fractions and the gas temperature in the combustion tube were simulated accurately.The calculated results for general gas distribution and temperature accurately explained the experimental results.In addition,adjustment of the model parameters for the combustion rate improved the O2 mole fractions on the central axis of the calculation results.The characteristics of the top-blown O2 jet in the combustion field were compared with those of a non-reacting jet at room temperature,at 1000K and 2000K.While the axial velocity at h/do =50,which was approximately the distance from the head of the top-blown lance to the iron bath,was temperature dependent,the axial dynamic pressure was not.This is because the increase in velocity in the combustion field is cancelled out by the decrease in density.
机译：为了稳定地生产优质钢，有必要提高精炼工艺的效率和生产率。此外，对顶吹条件的适当评估对于优化BOF操作至关重要。增加顶吹氧气的流量是必要的。此外，为了提高热利用效率，了解燃烧后的行为尤为重要。在这项研究中，氧气喷射的顶吹条件对燃烧后的行为的影响是通过计算流体动力学（CFD）研究了燃烧场中的氧气喷射行为。首先，通过与燃烧实验进行比较来评估CFD模拟模型的准确性，然后，燃烧对特性的影响使用该模型研究了顶吹式射流的形状，结果精确模拟了燃烧室中CO和CO2的摩尔分数以及燃烧管中的气体温度。一般气体分布和温度的合计结果准确地解释了实验结果。此外，燃烧速率的模型参数的调整改善了计算结果中心轴上的O2摩尔分数。将燃烧场与非反应射流在室温，1000K和2000K时的燃烧场进行了比较。h/ do = 50时的轴向速度大约是从顶吹喷枪的头部到铁的距离浴温度与温度有关，而轴向动压力与温度无关。这是因为燃烧场速度的增加被密度的降低抵消了。

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