环冷机分层布料仿真与优化

Simulation and optimization of sinter circular cooler layer-loading

以提高环冷机'余热利用区'出口烟气温度和环冷机的余热回收利用率为目标,对某钢铁企业420m2环冷机进行了分层布料仿真实验研究。以多孔介质模型为基础,结合Fluent软件的UDF和UDS功能,建立气、固局部非热力学平衡的双能量方程模型,以Fluent软件为计算平台,建立了烧结矿冷却过程求解的数学模型。利用该模型对不同的分层布料工况及常规布料工况进行了模拟计算,得到了最优分层布料参数。研究结果表明,按粒度对环冷机烧结矿实行分层布料可有效提高环冷机'余热利用区'出口烟气温度和环冷机的余热回收利用量,余热回收利用量比常规工况提高了23.2%,出口烟气平均温度比常规工况提高了43.72K。

To increase the flue gas temperature of outlet and waste heat recovery efficiency in the waste heat recovery area,a simulation study on sinter circular cooler layer-loading is carried out in a 420 m2 sinter circular cooler in an iron and steel company.Based on the porous medium model and the standard k-ε turbulence model,the two-equation energy model of non-equilibrium thermodynamics is set up with the user-defined-scalar（UDS）and user-defined-function（UDF）of Fluent.A mathematical model of sinter cooling process is established with the computing platform of Fluent.The optimal parameters were obtained by simulating different conditions of layer-loading and general-loading with the mathematical model.The optimal parameters are as follows：the height,porosity and size of bottom layer are 0.4 m,0.4 and 0.035 m,respectively;the height,porosity and size of middle layer are 0.5 m,0.3 and 0.025 m,respectively;those of top layer are 0.5 m,0.3 and 0.03 m;the gas velocity of inlet is 7.65 m·s-1,and the gas temperature of inlet is 404 K.The results show that compared with the general-loading,the layer-loading used in the sinter circular cooler can increase the flue gas temperature at outlet by 43.72 K,and increase the waste heat recovery efficiency by 23.2% in waste heat recovery area.