摘要
为优化烟气流场,在尾部烟道设置了均流装置,将烟气视为连续相,采用k-εRNG湍流模型,将飞灰相视为分散相,采用离散相模型,飞灰颗粒与烟气之间进行双向耦合,烟气深度余热回收装置采用多孔介质模型,对烟气两相流场进行了数值模拟.通过烟道内速度、压力分布和速度不均匀系数等对改进后的烟道进行了评价和分析,出口处速度不均匀系数接近1,出口处速度约为2.4m/s,烟道压降为700Pa,表明均流装置使烟气在深度余热回收装置内和出口处分布均匀.
To improve the flue gas field,a uniform flow-equalizing equipment was devised and used.Then,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 recovery device was simplified as porous media model.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.The results show that the velocity non-uniform coefficient is close to 1,the velocity is around 2.4 m/s and the pressure drop of the tail flue is 700 pa,which indicate that the flowequalizing equipment improves the gas field in the waste heat recovery device and its exit.
作者
常建忠
刘汉涛
尉庆国
CHANG Jianzhong LIU Hantao WEI Qingguo(Electrical and Power Engineering, Shanxi Institute of Energy, 030006 Taiyuan The Laboratory of Energy , Environment Engineering and Computational Fluid Dynamics, North University of China, 030051 Taiyuan Research Center of Shanxi Province for High Gravity Chemical Engineering and Technology, North University of China, 030051 Taiyuan)
出处
《煤炭转化》
CAS
CSCD
北大核心
2017年第4期74-80,共7页
Coal Conversion
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)
关键词
尾部烟道
三维流场
均流装置
数值模拟
速度不均匀系数
boiler trail flue
three-dimensional gas flow
flow-equalizing equipment
numerical simulation
velocity non-uniform coefficient
