某型号锅炉末级过热器流动特性的三维数值研究

Analysis of Boiler Finishing Super-heater Flow Field Characteristics With Threedimensional Numerical Simulation

为定量分析某电站锅炉末级过热器的烟气中颗粒冲刷磨损状况,基于CFD软件Fluent,建立了过热器管道的三维模型。由于末级过热器结构复杂,将整个流场划分为若干个子区域,分别划分网格,建立其三维网格模型。采用k-ε湍流模型,结合末级过热器现场测试的部分参数,对烟气的速度场和固相的颗粒轨迹场进行了数值模拟,为研究烟气对末级过热器管道的冲刷磨损提供了有效数据,为进一步分析过热器管道剩余寿命提供一定的理论指导。

To quantitatively analyze one boiler finishing superheater tubes surface wearing condition,the three dimensional model of finishing super-heater is built to simulate fume two-phase flow field,based on computational fluid dynamics（CFD） software Fluent.To save memory and simplify the 3D model,the flow field is divided into some sub-regions and sub-regions 3D grids are constructed.The k-epsilon turbulent flow model is used to simulate fume velocity field and discrete particles traces.The simulation illustrates the fumes how to wear the tubes in three dimensions.The results supply the guideline for the remainder life evaluation of finishing superheater tubes.