基于欧拉-拉格朗日方法的喷雾除尘效率影响因素数值模拟

Numerical simulation of influencing factors of spray dust removal efficiency based on Euler-Lagrangian method

为了研究最适合喷雾除尘的喷嘴参数,采用欧拉-拉格朗日方法,建立了空气相、粉尘相和喷雾相的三相耦合模型,其中喷雾相为离散相,空气相和粉尘相为欧拉连续相,粉尘相采用颗粒拟流模型。在Fluent软件中分别模拟了喷雾粒径、喷雾流量和喷雾速度几个因素对除尘效率的影响,并对现有喷嘴的3种喷雾工况进行除尘模拟。结果表明:喷雾除尘效率随着喷雾粒径的减小而增大,随着喷雾流量和喷雾速度的增大而增大。得到喷嘴的最佳除尘工况:Rosin-Rammler分布的平均粒径为46.4μm,喷雾流量为0.04 kg/s,喷雾速度为23.1 m/s。

In order to study the most suitable nozzle parameters for spray dust removal, the Euler-Lagrangian method was used to establish a three-phase coupling model of air phase, dust phase and spray phase. The spray phase is discrete phase, the air phase and the dust phase are Euler continuous phase, and the dust phase adopts the particle fitting flow model. Fluent software was used to simulate the influence of spray particle size, spray flow rate and spray speed on the dust removal efficiency, and the three spray conditions of the existing nozzle were simulated. The results show that the spray dust removal efficiency increases with the decrease of spray particle size and with the increase of spray flow rate and spray speed. The optimal dust removal conditions are obtained as follows: the average particle size of Rosin-Rammler distribution is 46.4 μm, the spray flow rate is 0.04 kg/s, and the spray speed is 23.1 m/s.