湿式烟气脱硫喷淋塔内部流场数值模拟研究  

Numerical simulation of wet flue gas desulfurization spray tower

作　　者：赵喆[1] 田贺忠[1] 阿庆兴[1] 孔祥应[1] 郝吉明[1] 张华[2] 刘汉强[2] 

机构地区：[1]清华大学环境科学与工程系,北京100084 [2]北京国电龙源环保工程有限公司,北京100761

出　　处：《环境污染治理技术与设备》2005年第5期16-20,共5页Techniques and Equipment for Environmental Pollution Control

基　　金：国家"863"高技术研究发展资助项目(2001AA642020)

摘　　要：以300MW机组湿法烟气脱硫喷淋塔为研究对象,利用计算流体力学通用软件对其内部两相流场进行模拟。气相湍流由标准k 模型描述,喷淋液滴由拉格朗日颗粒轨道模型描述。预测了无喷淋和有喷淋2种条件下的气相湍流流场分布、沿塔高方向不同截面上的气速分布以及喷淋液滴的轨迹。模拟结果表明,引入喷淋液后,出口截面气速分布明显均匀化,其最大值由无喷淋时的12m/s降至6m/s。该最大值出现在靠近塔壁处,是由塔壁附近喷淋密度较低造成的,可通过改进周边喷嘴的布置方式及喷嘴型式进行优化。A two-dimension computational fluid dynamics (CFD) study of the two-phase flow in a wet flue gas desulfurization(FGD) spray tower is presented.The gas flow is described using standard k- turbulence model,and the motion of the liquid droplets is described in a Lagrangian way,using the stochastic discrete particle model.The gas velocity profiles and trajectories of the droplets were acquired with and without spraying.The results show that when spray is introduced,the uniformity of gas velocity improves greatly,the max velocity in the outlet section changes from 12 m/s to 6 m/s.Due to the lower concentration of liquid droplets,the gas velocity near the wall is higher than in the central region.This problem can be solved by optimizing the arrangement of the spray nozzles near the wall.

关 键 词：数值模拟研究 湿式烟气脱硫 喷淋塔 内部流场 300MW机组 湿法烟气脱硫 计算流体力学 模型描述 两相流场 通用软件 拉格朗日 流场分布 模拟结果 喷淋密度 布置方式 最大值 均匀化 湍流 气相 液滴 气速 截面 塔壁 喷嘴 

分 类 号：X145[环境科学与工程—环境科学] TQ028.32[化学工程]