Experimental and Calculation Analysis on Characteristics of Combustion Jets
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.
Akihide Kaizawa Takeo Inomoto Yuji Ogawa Michitaka Matsuo
Process Research Laboratories, Nippon Steel & Sumitomo Metal Corporation20-1 Shintomi, Futtsu, Chiba 293-8511, Japan
国际会议
The 4th Australia-China-Japan Joint Symposium on Iron and Steelmaking(第四届中日澳钢铁冶金学术会议)
沈阳
英文
339-345
2012-11-03（万方平台首次上网日期，不代表论文的发表时间）