烧结矿余热回收竖罐内气体流动的数值计算

以多孔介质模型为基础,运用气固填料床动力学理论建立了烧结竖罐内气体流动的数学模型,确立了数学模型的边界条件.以FLUENT软件为计算平台,采用自定义函数(UDF)对罐体料层径向空隙率分布进行定义,模拟研究竖罐内气体流动的分布规律,进而探讨影响竖罐内气流分布的主要因素及其影响规律.研究结果表明,冷却段区域,气体流速沿径向由罐体中心至内壁逐渐增加,最后在内壁附近突然增大;影响竖罐内气流分布的主要因素为料层空隙率分布和罐体预存段内径.空隙率径向偏析越严重,预存段内径越大,气流分布越不均匀.

Numerical Investigation of Gas Flow in Vertical Tank for Recovering Sinter Waste Heat

Based on the porous media model， the mathematical model of the gas flow in sinter vertical tank was established according to the gas solid packed beds dynamic theory， and the boundary conditions of the mathematical model were determined．This model was conducted on the platform of FLUENT software. The radial voidage distribution of tank material layer was defined through the user defined functions (UDF). The basic law of the gas flow in vertical tank was studied and the main factors and influence rules influencing the gas flow distribution were discussed. The results showed that in the cooling section， the gas flow rate gradually increases from the tank center to the inner wall along the radial， and finally increases suddenly near the inner wall. The main factors that influence the gas flow distribution in vertical tank are the radial voidage distribution of bed layer and the pre-stored segment diameter. The more serious the voidage radial segregation is， and the larger the pre-stored segment diameter is， the more uneven the gas flow distribution in vertical tank is.