A Modified Model for Calculating Theoretical Flame Temperature in Blast Furnace and Its Application

• Published in: Journal of iron and steel research, international international, 2015, Vol.22 (1), p.9-14
• Main Authors: ZHU, Li, WU, Keng, ZHANG, Er-hua, SHE, Yuan, ZHAN, Wen-long, LIU, Qi-hang
• Format: Article
• Language: English
• Subjects: Applied and Technical Physics; blast furnace; Blast furnaces; Coal; Engineering; Machines; Manufacturing; Materials Engineering; Materials Science; Mathematical models; Metallic Materials; Metallurgy and Metal Working; modified model; PCI; Physical Chemistry; Processes; Pulverized coal; Reduction; Semiconductor devices; Silicon dioxide; SiO2 reduction rate; SiO2含量; TFT; theoretical flame temperature; Thin film transistors; 接近开关; 模型应用; 理论火焰温度; 计算; 高炉
• ISSN: 1006-706X; 2210-3988
• DOI: 10.1016/S1006-706X(15)60002-4

The theoretical flame temperature （TFT） before tuyere, always highly concerned by blast furnace （BF） operators, is one of the most important parameters for evaluating the thermal state of hearth. However, some influ- encing parameters, for example, the SiO2 reduction by carbon, were always neglected or inaccurate when calculating the TFT. According to the definition of TFT, the temperature of coke into raceway and the reduction rate of SiO2 in ash of coke and pulverized coal were obtained by analyzing the samples before tuyere in blast furnace. Taking full ac- count of different factors, a modified model for calculating the TFT in blast furnace was established. The effects of the oxygen enrichment rate, the reduction rate of SiO2 in raceway, the ash content in coke and pulverized coal and the pulverized coal injection （PCI） rate on TFT were determined quantitatively. The modified model was applied to selecting the used coal for PCI in blast furnace. Considering the different SiO2 contents of mixed coal, the calculated TFT remained a stable level. This showed that the selected coal could be suitable for PCI in blast furnace.