石灰浆液荷电喷雾脱硫流场的数值模拟

为了获得脱硫塔内荷电石灰浆液脱硫率的理论计算方法,开展了荷电气液两相流场的数值模拟.通过试验用脱硫塔内部荷电喷雾脱硫特点的分析,建立了几何模型、静电场模型和两相流模型,通过商用Fluent6.3计算功能的扩展,获得环状电极静电场分布,进而实现感应静电场与两相流场的耦合计算,分析了浆液荷电条件下的两相流场特性及其对脱硫效果的影响.结果表明:电场强度分布基本对称于脱硫塔轴线,随着与电极距离的增加场强衰减迅速;浆液滴荷电使射流区外侧卷吸区域加大,浆液滴速度下降,电极附近射流影响区域变短,有利于加强两相接触和SO2吸收,同向并流的荷电脱硫增益更明显.

Numerical simulation of flow field on desulphurization through electrostatic spraying of lime slurry

In order to investigate the mechanism of lime slurry droplet charging and absorbing SO2,the electrostatic spraying two-phase flow field of lime slurry was numerically simulated.Geometric model,electrostatic model and two-phase flow model were established based on the characteristics of desulphurization tower and charge electron spray desulphurization.The characteristic of ring-like electrostatic field was obtained by extending commercial Fluent 6.3 function to achieve the coupled simulation between electrostatic field and two-phase flow field.The two phase flow characteristics and desulphurization effect under the condition of slurry electric charge were analyzed.The results show that the distribution of electric intensity is basically symmetrical about the desulfurization tower axis.The electric intensity decreases rapidly with the increasing of distance away from electrode.The outboard entrainment zone is increased and the velocity is decreased by electron charge in slurry drop,and the zone near electrode effected by jet flow is shortened to strengthen the two phase contact and SO2 absorption.The electrostatic charged desulphurization with same flows direction is better than that with opposite flow direction.