Research on the mechanism of deep dust removal in desulfurization absorber
In this paper,the mechanism of deep removal of submicron and micron-sized particles in the gas-liquid-solid three-phase flow field inside a limestone-gypsum wet flue gas desulfurization(FGD)tower was investigated.The Eulerian-Lagrangian model was used to simulate the particle capturing process of single droplet,and the distribution and capturing of particles with different sizes in FGD tower were analyzed.The results show that,for submicron particles,the dominant mechanism on particle capturing in FGD tower is derived from thermophoresis effect,while inertial capture and interception capture are relatively weak.Increasing the temperature difference between gas and liquid phases can improve the removal efficiency of submicron particles in the FGD tower.For micron-sized particles,inertial capture becomes the main mechanism,and its capture efficiency is affected by the relative velocity of gas to liquid phases and the volume fraction of droplets.Increasing the relative velocity of gas to liquid phases and the volume fraction of droplets can improve the removal efficiency of micron-sized particles in the FGD tower.
gas-liquid-solid three-phase flow fieldsubmicron particlesmicron-sized particlesdeep removal mechanismEule-rian-Lagrangian model
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