液柱塔内流场和SO_2吸收的CFD模拟和优化  

CFD simulation and optimization of flow field and SO_2 absorption in impinging stream scrubber

作　　者：郭瑞堂[1] 高翔[1] 王君[1] 程峰[1] 骆仲泱 倪明江[1] 岑可法[1] 

机构地区：[1]浙江大学能源清洁利用国家重点实验室,浙江杭州310027

出　　处：《浙江大学学报（工学版）》2007年第3期494-498,503,共6页Journal of Zhejiang University：Engineering Science

基　　金：教育部科学技术研究重大资助项目(0305);教育部科学技术研究重点资助项目(03087)

摘　　要：为提高湿法烟气脱硫液柱冲击塔的脱硫效率,研究了塔内流场分布情况及其对SO2.吸收的影响.塔内烟气流场分布的数值模拟以雷诺时均的纳维-斯托克斯方程为基础,采用拉格朗日离散相模型,计算了石灰石浆液液滴的运动轨迹以及气液两相之间的相间作用.分析了液柱冲击塔的烟气流速、液气比以及入口几何结构对塔内流场分布的影响,并研究了流场分布对SO2吸收的影响.数值结果表明,浆液的喷淋对于烟气的流动具有整流作用.浆液喷淋量一定时,随烟气流速增大,塔内烟气迹线分布情况趋于均匀.塔内流场的分布可以通过采用倾斜的入口来改善,当入口倾角为4°时,塔内流场分布相对比较均匀.To improve the SO2 removal efficiency of impinge stream scrubber for wet flue gas desulfuriza-tion, the flow field distribution in the scrubber and its effects on SO2 absorption were studied. Flue gas flow field distribution was simulated using the Reynolds-averaged Navier-Stocks equations, and the trajectory of limestone slurry droplets and the interactions between gas and liquid phases were calculated employing the Lagrangian discrete phase model. The effects of flue gas velocity, ratio of liquid to gas and the gemetry structure of entrance in the impinge stream scrubber on the flow field distribution were analyzed, and the effects of the flow field distribution on SOz absorption were investigated. The numerical results show that the spray of slurry can rectify the flue gas flow. The path line distribution of flue gas in the scrubber becomes more homogeneous with the increasing flue gas velocity at a stationary slurry spray flux. The flow field distribution in the scrubber can be improved using a sloping entrance. The flow field distribution in the scrubber is more homogeneous with a sloping entrance angle of 4°.

关 键 词：计算流体力学 流场 吸收 优化 

分 类 号：X701.3[环境科学与工程—环境工程]