Simulation Study on Influence of Installation Height of Mist Eliminator on Liquid Holdup of Flue Gas in Desulfurization Tower

During the operation of a power plant, there is a periodic phenomenon of mist eliminator resistance rising and scaling, which results in the partial collapse of the mist eliminator. In order to solve this problem, the gas-liquid two-phase flow field in the desulfurization tower was simulated by numerical simulation method, and the condition of flue gas carrying spray droplets at the bottom of the mist eliminator was further studied, as affected by the varying heights (2.0-3.5 m) from the top spray layer center  to the bottom and the different misting drop sizes (1 500-2 500 µm) of the particular nozzles. The results show that with the increase of the distance from the mist eliminator to the spray layer, the mass concentration of spray drops decreases, and the flow field inside the desulphurization tower becomes more uniform. The quantitative data were obtained by numerical simulation, which can provide a diagnostic thought and optimization basis for domestic coal-fired power plants with similar phenomena such as mist eliminator blocking and collapsing.