粒化仓中高温渣粒流动换热特性的数值模拟

Numerical Simulation of Flow and Heat Transfer Characteristics of High Temperature Slag Particles in Granulated Silo

针对离心粒化后的高温熔渣颗粒在粒化仓中的流动换热过程,本文采用离散相模型及DO辐射模型对粒化仓内的气固两相流动和换热进行了二维瞬态数值模拟。主要研究了不同渣粒流量、渣粒直径及风速下粒化仓内温度分布规律和气固换热效果。结果表明:粒化仓中空气温度沿径向方向逐渐升高,颗粒与壁面碰撞区域为空气温度最大区域;颗粒的换热主要以辐射换热为主;减小颗粒直径是强化换热最有效的手段。

For the flow and heat transfer process of high temperature slag particles after granulation in the granulation silo.In this paper,two-dimensional transient numerical simulation of gas-solid two-phase flow and heat transfer in granular silo is carried out by using discrete phase model and DO radiation model.The temperature distribution in the granulation silo under different slag flow rate,particle diameter and wind velocity was studied.The results show that the air temperature in the granulated silo increases gradually in the radial direction,and the air temperature in the area where the particles impact the wall is the highest.The heat transfer of particles is mainly radiation heat transfer.Reducing particle diameter is the most effective way to enhance heat transfer.