高炉回旋区喷吹煤粉三维模拟

作者:陈天;程树森 刊名:过程工程学报 上传者:张冰

【摘要】建立了高炉回旋区喷吹煤粉的气固两相流动、辐射和燃烧三维数学模型,用商业软件模拟了高炉回旋区内流场、温度场及组分变化,研究了鼓风富氧率、鼓风温度、鼓风速度对高炉回旋区的影响.结果表明,气体在回旋区内的流动可分为沿风口方向的高速射流区和在回旋区上部的回旋流动.回旋区内温度分布不均匀,回旋区下部温度较高,热量沿回旋区边界向上部传递.沿风口中心线O2不断被消耗,CO2含量随O2含量减少而增加,在O2基本耗尽时达到峰值.随CO不断生成,CO2含量逐步减少,直至消失.提高鼓风富氧率、鼓风温度及增加鼓风速度能促进煤粉燃烧,提高煤粉燃烧速度.

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第 18卷第 2期 201 8年 4月 过 程 工 程 学 报 The Chinese Journ al of Process Engineering 、,0l_18 NO.2 Apr.2018 三 DOI:10.120348.issn.1009—606X.217262 高炉回旋区喷吹煤粉三维模拟 陈 天 , 程 树森 (北京科技大学冶金与生态工程学院,北京 100083) 摘 要:建立了高炉回旋区喷吹煤粉的气固两相流动、辐射和燃烧三维数学模型,用商业软件模拟了高炉回旋区内流场、温度 场及组分变化,研究了鼓风富氧率、鼓风温度、鼓风速度对高炉回旋区的影响.结果表明,气体在回旋区内的流动可分为沿风 口方向的高速射流区和在回旋区上部的回旋流动.回旋区内温度分布不均匀,回旋区下部温度较高,热量沿回旋区边界向上部 传递.沿风口中心线 O2不断被消耗,C02含量随 O2含量减少而增加,在 O2基本耗尽时达到峰值.随 CO不断生成,CO2含量逐 步减少,直至消失.提高鼓风富氧率、鼓风温度及增加鼓风速度能促进煤粉燃烧,提高煤粉燃烧速度. 关键词 :高炉;回旋区;喷吹煤粉;煤粉燃烧;数值模拟 中图分类号:TF536 文献标识码 :A 文章编号:1009—606X(2018)02—0265—09 Three—dimensional Modelling of Pulverized Coal Injection in Blast Furnace Raceway Tian CHEN, Shusen CHENG (School ofMetallurgical and Ecological Engineering,University ofScience and Technology Beijing,Beij'ing 100083,China) Abstract:A three—dimensional mathematical modelincluding gas—solid flow,radiation and COal combustion was established to simulate the pulverized coal injection in blast furnace raceway.With the help of commercial software.the flow field.temperature ifeld and composition change in the raceway were simulated.The results showed that the flOW pattern can be divided into two parts:a high.speed jet along the tuyere direction and a large—scale recirculation at the upper part of the raceway.The distributions of tempera~re field was not uniform,and the temperature was higher at the lower part of raceway an d the heat transmits to the upper part along the boundary of the raceway.Oxygen was consum ed constan tly along the tuyere a

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