纯氧助燃钢包烘烤工艺中燃烧场的模拟  

Numerical simulation of combustion field in ladle baking process by oxy-fuel combustion

作　　者：单建标 齐凤升 张雪平 李宝宽 Shan Jianbiao;Qi Fengsheng;Zhang Xueping;Li Baokuan(School of Metallurgy, Northeastern University, Shenyang 110819, China)

机构地区：[1]东北大学冶金学院

出　　处：《材料与冶金学报》2019年第3期182-188,共7页Journal of Materials and Metallurgy

基　　金：国家重点研发计划资助项目(2017YFB0304100)

摘　　要：钢包烘烤预热可使钢水温度稳定在低过热度下,有利于减少铸坯缺陷,提高铸坯质量.纯氧助燃钢包烘烤工艺由于具有火焰刚性好,热损失少等优点逐渐受到青睐.钢包烘烤过程中伴随了燃烧、流动、对流和辐射传热等复杂物理化学过程,明确这些过程的相互作用机理对于提高钢包烘烤效率、节约能源具有重要意义.本文基于标准k-ε湍流模型耦合涡耗散燃烧模型和P-1辐射模型建立钢包烘烤过程多场耦合数学模型,并针对纯氧助燃与空气助燃的不同,建立计算辐射吸收系数修正的WSGGM模型,模拟了O 2的体积分数为21%、99%时钢包内的燃烧场,对比分析两种情况下温度分布以及燃烧产物CO 2和H 2O的浓度分布规律.结果表明,纯氧助燃火焰温度高,火焰刚性好;烟气量小,热损失少;纯氧助燃的燃烧产物主要为CO 2、H 2O,气体辐射能力增强,烘烤效率高.The preheating of ladle baking can stabilize the temperature of molten steel at low superheat, which is beneficial to reduce the defects of billet and improve the quality of billet. Oxy-fuel combustion ladle baking process is gradually favored due to its advantages of good flame rigidity and less heat loss. The ladle baking process includes combustion chemical reaction, flow, convection, radiation and other complex physical and chemical processes. In this paper, a multi-field coupling mathematical model for ladle bake process is established based on the model of standard k-ε turbulence model coupled vortex dissipation combustion model and p-1 radiation model. A revised WSGGM model for calculating the radiation absorption coefficient correction is established for the difference between oxy-fuel combustion and air combustion. By simulating the combustion field in ladle with an oxygen content of 21% and 99%, the temperature distribution and the concentration distribution of CO 2 and H 2O of combustion products under the two conditions were compared and analyzed. The results showed that the temperature of oxy-fuel combustion flame is high and the flame rigidity is strong. Oxy-fuel combustion fuel gas quantity is small, heat loss is little;oxy-fuel combustion products are mainly CO 2 and H 2O, which enhanced gas radiation capacity and high baking efficiency.

关 键 词：纯氧助燃燃烧 钢包烘烤 燃烧场 数值模拟 

分 类 号：TF748[冶金工程—钢铁冶金] TK16[动力工程及工程热物理—热能工程]