【摘要】 湿法烟气脱流装置中水力旋流器分级试验表明,进口石灰石浆液的颗粒质量浓度为15%时,溢流口颗粒质量浓度达30%,溢流颗粒粒径则集中于30μm以下;随着颗粒粒径的增大,颗粒底流口回收率也在增大,当粒径达到30μm时,回收率已经接近100%。数值模拟表明,雷诺应力湍流模型、自由表面多相流动模型和斯托克斯拉格朗日模型能很好地描述水力旋流器内复杂三维运动的石灰石颗粒分级运动和规律。采用了初始边界条件不给出分流比、也不设定空气柱的模拟方法,模拟结果显示了空气柱的形成、流体的旋流流动。模拟得到的不同粒径颗粒的分级效率与高进口质量浓度条件下的试验结果吻合较好。更多还原

【Abstract】 In a WFGD (Wet-method Flue Gas Desulfuration) device,the gradation experiment of a hydrocyclone shows that when the particle-mass concentration of limestone slurry is 15%,at the overflow port it will be 30%. The overflow particle diameter is concentrated at less than 30 μm. With an increase of the particle diameter,the particle recovery rate at the bottom outlet will also increase. When the particle diameter reaches 30μm,the particle recovery rate will already approach 100%. The numerical simulation results show that the Reynolds stress turbulent flow model,free surface multi-phase flow model and Stokes-Lagrange model can depict very well the limestone particle gradation movement and regularity featuring a complex three-dimensional motion in the hydrocyclone. A numerical simulation method with no need to give a flow division ratio for the initial boundary condition and to preset an air column was adopted and the simulation results showed the formation of air column and eddy flow of the fluid. The gradation efficiency of particles in different diameters thus obtained is in relatively good agreement with that tested under the condition of a high inlet mass concentration.更多还原