DD分解炉改变生料进口位置的数值模拟  

Numerical Simulations in Double-sprayed Precalciner by Changing the Location of Raw Meal Inlets

作　　者：梅书霞[1,2] 谢峻林[1,2] 何峰[1,2] 金明芳[1,2] 

机构地区：[1]武汉理工大学材料科学与工程学院,武汉430070 [2]武汉理工大学硅酸盐建筑材料国家重点实验室,武汉430070

出　　处：《武汉理工大学学报》2012年第9期26-30,共5页Journal of Wuhan University of Technology

基　　金：国家"十二五"科技支撑计划(2011BAE29B01);中央高校基本科研业务费专项资金

摘　　要：针对一实际尺寸的分解炉建立数学模型进行煤粉燃烧与碳酸钙分解耦合的数值模拟,并改变生料进口位置进行了对比研究。其中,对连续相采用Euler坐标系下的k-ε双方程湍流模型,对颗粒相的运动轨迹采用拉格朗日坐标系下的离散相模型(Discrete Phase Model)进行计算,对煤粉燃烧及碳酸钙分解过程采用组分运输模型(Species TransportModel)结合涡耗散概念(EDC)模型进行模拟,并采用P-1辐射模型来计算气体和颗粒之间的辐射换热。研究结果表明:与生料进口位于三次风进口正上方相比,当生料进口位于三次风进口侧上方时更为合理:煤粉的燃烧状况更理想,燃烬率达到86%;碳酸钙的分解率更高,预测值为92.9%。Numerical simulations of combustion and decomposition processes in a precalciner were carried out by changing the location of raw meal inlets.In Euler coordinate system the gas phase is expressed with k-ε two-equation model,in Lagrange coordinate system the solid phase is expressed with discrete phase model（DPM）,the chemical reaction is expressed with species transport model,the radiation is expressed with P-1 radiation model.The results show that when the raw meal inlets are on the side of the tertiary air inlet,the combustion condition is more rational in the precalciner with the predicted burn-off rate of pulverized coal 86%,and the calcium carbonate decompose more fully with the predicted decomposing rate of calcium carbonate 92.9%,than that when the raw meal inlets are above the tertiary air inlet.

关 键 词：分解炉 煤粉燃烧 碳酸钙分解 生料进口位置 数值模拟 

分 类 号：TQ172[化学工程—水泥工业]