多粒径高炉渣在移动床内余热回收的数值模拟  

Numerical Simulation of Waste Heat Recovery for Blast Furnace Slags With Multi-particle-size Distribution in Moving Bed

作　　者：邱琳 李艳丽[1,2] 冯妍卉 张欣欣[1,2] QIU Lin;LI Yan-Li;FENG Yan-Hui;ZHANG Xin-Xin(School of Energy and Environmental Engineering, University of Science and Technology Beijing, Beijing 100083, China;Beijing Key Laboratory of Energy Saving and Emission Reduction for Metallurgical Industry, University of Science and Technology Beijing, Beijing 100083, China)

机构地区：[1]北京科技大学能源与环境工程学院,北京100083 [2]北京科技大学冶金工业节能减排北京市重点实验室,北京100083

出　　处：《工程热物理学报》2019年第10期2407-2414,共8页Journal of Engineering Thermophysics

基　　金：国家重点研发计划项目(No.2017YFB0603603;No.2017YFB0603601)

摘　　要：本文采用CFD-DEM耦合法(Computational Fluid Dynamics and Discrete Element Method)对三维移动床中多粒径高炉渣颗粒的余热回收过程进行了数值模拟与分析。研究了三种不同粒径分布系统:均一粒径系统,二元混合粒径系统和正态分布粒径系统的气-固换热特性。通过应用程序编程接口Api控制高炉渣颗粒的质量流率,使得移动床内颗粒流动达到动态平衡。进一步分析了颗粒相和流体相的温度场、对流和辐射换热率、颗粒和气体的出口温度以及移动床的余热回收率,获得了不同粒径分布颗粒系统的气固换热规律。研究发现:在相同工况下,二元混合粒径系统的颗粒出口温度最低,气体出口温度最高,换热效果最好,余热回收率相较于其余两种粒径系统也最高。In this paper,the CFD-DEM coupling method(Computational Fluid Dynamics and Discrete Element Method) is used to simulate and analyze the waste heat recovery process of the blast furnace slags with multi-particle-size distribution in a three-dimensional moving bed.The gas-solid heat transfer characteristics of three different particle size distribution systems are studied,including uniform particle size system,binary mixed particle size system and normal distribution particle size system.The mass flow rate of the blast furnace slags is controlled by the application programming interface(Api),which ensures the slag flow in the moving bed reaches a dynamic balance.The gas-solid heat transfer laws of systems with different particle size distribution axe obtained by analyzing the temperature fields of the particle phase and the fluid phase,the convection and radiation heat transfer rates,the outlet temperatures of the particles and gas,and the heat recovery rate of the moving bed.This study finds that the binary mixed particle size system possesses the lowest particle outlet temperature,the highest gas outlet temperature and the best heat transfer effect.Moreover,the heat recovery rate in the binary mixed particle size system is the highest compared with the other two particle size distribution systems under the same working conditions.

关 键 词：CFD-DEM耦合法 多粒径分布高炉渣 移动床 余热回收率 

分 类 号：TK121[动力工程及工程热物理—工程热物理]