【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。更多还原

【Abstract】 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.更多还原