烟气深度余热利用系统的多相流场模拟及优化  

Multiphase Flow Simulation of Flue Gas in Deep Waste Heat Utilization System and Flow Field Optimization

作　　者：仝志辉[1,2] 刘汉涛 马理强[1,2] 李海桥 TONG Zhi-hui;LIU Han-tao;MA Li-qiang;LI Hai-qiao(The Lab. of Energy and Environment Engineering and Computational Fluid Dynamics,North University of China, Taiyuan 030051, China;School of Energy and Power Engineering, North University of China, Taiyuan 030051, China)

机构地区：[1]中北大学山西省太阳能光热综合利用工程技术研究中心,山西太原030051 [2]中北大学能源动力工程学院,山西太原030051

出　　处：《中北大学学报（自然科学版）》2019年第4期331-335,343,共6页Journal of North University of China(Natural Science Edition)

基　　金：国家自然科学基金资助项目(51476150);中国博士后科学基金资助项目(2016M590215);山西省高等学校科技创新项目资助的课题

摘　　要：为充分研究锅炉尾部烟气在烟气深度余热利用系统内的流动细节,优化余热利用,采用k-εRNG湍流模型模拟连续相烟气,离散相模型模拟飞灰分散相,双向耦合飞灰颗粒与烟气,将烟气深度余热利用装置简化为多孔介质模型,对烟气两相流场进行了数值计算.模拟结果表明,烟气在非均匀分布的烟气档板中流动分布不均.在优化为烟气均布挡板后,通过压力、速度以及速度不均匀系数等对均布装置进行了评价.In order to study the gas flow field in the boiler tail flue and utilize optimally the waste heat, numerical investigation was carried out to simulate the two phase flow of flue gas, in which the gas was considered as continuous phase and described by k-ε RNG turbulence model, and the flying ash was treated as dispersed phase and described by discrete phase model. The gas and flying ash was interacted by two-way coupling. The waste heat utilization device was simplified as porous media model. Simulation results show that the design of the flow-equalizing equipment and the flue were evaluated and analysed according to the pressure, velocity distribution and velocity non-uniform coefficient.

关 键 词：数值模拟 三维流场 尾部烟道 均布挡板 

分 类 号：TH122[机械工程—机械设计及理论]