转杯粒化装置中高炉渣颗粒换热特性模拟

Simulation study on heat transfer characteristics of blast furnace slag particles in rotor granulation device

针对转杯粒化装置中高炉渣颗粒飞行和撞击壁面的换热过程,采用CFD-DEM方法中的欧拉模型对粒化仓中的气固两相流动和换热进行了三维瞬态模拟,考虑了流体相与固体相之间的动量交换和固体相对流体相的影响,主要研究了不同的颗粒直径、颗粒质量流量和空气进口速度对粒化装置内部温度分布及气固换热效果的影响.结果表明:粒化装置内部的高温区集中在颗粒撞击壁面附近;颗粒的换热方式主要以对流换热和辐射换热为主,针对不同的工况条件,各种换热方式的占比有所不同;减小颗粒直径是强化熔渣颗粒在粒化装置内部换热效果最有效的手段.

Aiming at the heat transfer process of blast furnace slag particles flying and impacting the wall in the rotor granulation device,this paper uses the Euler model in the CFD-DEM method to conduct a three-dimensional transient simulation of the gas-solid two-phase flow and heat transfer in the granulation chamber.The momentum exchange between the fluid phase and the solid phase and the influence of the solid relative to the fluid phase are considered.The effects of different particle diameters,particle mass flow rates and air inlet speeds on the internal temperature distribution of the granulation device and the effect of gas-solid heat transfer are mainly studied.The results show that the high-temperature area inside the granulation device is concentrated near the particle impacting wall;the heat exchange methods of the particles are mainly convective heat exchange and radiation heat exchange.According to different working conditions,the proportion of various heat exchange methods is different.Reducing the particle diameter is the most effective means to enhance the heat transfer effect of the slag particles in the granulation device.