高炉风口理论燃烧温度计算模型的改良

在原有改进型理论燃烧温度(Tf)模型的基础上,进一步针对煤粉燃烧率、煤粉分解热以及灰分中Si O2在高温下还原耗热等方面内容进行修正和完善,提出更为全面的Tf计算模型,并对比分析了传统模型、原改进型模型以及本模型中富氧率、鼓风温度、鼓风湿度以及喷煤比等因素变化时对理论燃烧温度的影响规律.计算结果表明,与传统模型以及原有改进型模型相比,使用本模型时不同鼓风参数对理论燃烧温度的影响更为趋于"缓和",高炉下部炉缺状态相对更为稳定.事实上高炉在"高富氧,低煤比"或"低富氧,高煤比"两种操作下均未出现Tf过高或不足的问题,也印证了本模型能更贴切地反映实际生产高炉下部的炉缸热状态.

Improvements on Calculation Model of Theoretical Combustion Temperature in the Tuyere Raceway of BF

Based on the original modified model for calculating theoretical combustion temperature (T_○f)， the calculation methods for the combustion efficiency of pulverized coal， the decomposition heat of pulverized coal and the heat consumption of SiO₂ in ash which was reduced at high temperature， were modified and improved in order to propose a more comprehensive model for calculating T_○f. The effects of oxygen enrichment rate， blast temperature， blast humidity and coal rate on T_○f were analyzed and compared among the traditional model， the original modified model and the present parameters model under different blast respectively. The results showed that compared with the traditional model and original modified model， the calculation value of T_○f using the present model under different blast parameters tends to be flatter and the thermal state of hearth is relatively stable. Actually， according to two kinds of smooth operation conditions existing in the practical production which are “high oxygen enrichment rate， low coal injection rate” and “low oxygen enrichment rate， high coal injection rate” with suitable T_f， it was verified that this model could appropriately reflect the actual thermal state of hearth in blast furnace(BF).